/*
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * as published by the Free Software Foundation; either version 2
 * of the License, or (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software Foundation,
 * Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
 *
 * The Original Code is Copyright (C) 2009 Blender Foundation.
 * All rights reserved.
 */

/** \file
 * \ingroup edinterface
 */

#include <limits.h>
#include <stdlib.h>
#include <string.h>

#include "DNA_brush_types.h"
#include "DNA_userdef_types.h"

#include "BLI_listbase.h"
#include "BLI_math.h"
#include "BLI_rect.h"
#include "BLI_string.h"
#include "BLI_string_utf8.h"
#include "BLI_utildefines.h"

#include "BKE_context.h"

#include "RNA_access.h"

#include "BLF_api.h"

#include "ED_node.h"

#include "UI_interface.h"
#include "UI_interface_icons.h"

#include "interface_intern.h"

#include "GPU_batch.h"
#include "GPU_batch_presets.h"
#include "GPU_immediate.h"
#include "GPU_immediate_util.h"
#include "GPU_matrix.h"
#include "GPU_platform.h"
#include "GPU_state.h"

#ifdef WITH_INPUT_IME
#  include "WM_types.h"
#endif

/* -------------------------------------------------------------------- */
/** \name Local Enums/Defines
 * \{ */

/* icons are 80% of height of button (16 pixels inside 20 height) */
#define ICON_SIZE_FROM_BUTRECT(rect) (0.8f * BLI_rcti_size_y(rect))

/* visual types for drawing */
/* for time being separated from functional types */
typedef enum {
  /* default */
  UI_WTYPE_REGULAR,

  /* standard set */
  UI_WTYPE_LABEL,
  UI_WTYPE_TOGGLE,
  UI_WTYPE_CHECKBOX,
  UI_WTYPE_RADIO,
  UI_WTYPE_NUMBER,
  UI_WTYPE_SLIDER,
  UI_WTYPE_EXEC,
  UI_WTYPE_TOOLBAR_ITEM,
  UI_WTYPE_TAB,
  UI_WTYPE_TOOLTIP,

  /* strings */
  UI_WTYPE_NAME,
  UI_WTYPE_NAME_LINK,
  UI_WTYPE_POINTER_LINK,
  UI_WTYPE_FILENAME,

  /* menus */
  UI_WTYPE_MENU_RADIO,
  UI_WTYPE_MENU_ICON_RADIO,
  UI_WTYPE_MENU_POINTER_LINK,
  UI_WTYPE_MENU_NODE_LINK,

  UI_WTYPE_PULLDOWN,
  UI_WTYPE_MENU_ITEM,
  UI_WTYPE_MENU_ITEM_RADIAL,
  UI_WTYPE_MENU_BACK,

  /* specials */
  UI_WTYPE_ICON,
  UI_WTYPE_ICON_LABEL,
  UI_WTYPE_PREVIEW_TILE,
  UI_WTYPE_SWATCH,
  UI_WTYPE_RGB_PICKER,
  UI_WTYPE_UNITVEC,
  UI_WTYPE_BOX,
  UI_WTYPE_SCROLL,
  UI_WTYPE_LISTITEM,
  UI_WTYPE_PROGRESSBAR,
  UI_WTYPE_NODESOCKET,
  UI_WTYPE_DATASETROW,
} uiWidgetTypeEnum;

/* Button state argument shares bits with 'uiBut.flag'.
 * reuse flags that aren't needed for drawing to avoid collision. */
enum {
  /* Show that holding the button opens a menu. */
  UI_STATE_HOLD_ACTION = UI_BUT_UPDATE_DELAY,
  UI_STATE_TEXT_INPUT = UI_BUT_UNDO,
  UI_STATE_ACTIVE_LEFT = UI_BUT_VALUE_CLEAR,
  UI_STATE_ACTIVE_RIGHT = UI_BUT_TEXTEDIT_UPDATE,
  UI_STATE_TEXT_BEFORE_WIDGET = UI_BUT_IMMEDIATE,

  UI_STATE_FLAGS_ALL = (UI_STATE_HOLD_ACTION | UI_STATE_TEXT_INPUT | UI_STATE_ACTIVE_LEFT |
                        UI_STATE_ACTIVE_RIGHT | UI_STATE_TEXT_BEFORE_WIDGET),
};
/* Prevent accidental use. */
#define UI_BUT_UPDATE_DELAY ((void)0)
#define UI_BUT_UNDO ((void)0)

/** \} */

/* -------------------------------------------------------------------- */
/** \name Internal Color Utilities
 * \{ */

static void color_blend_v3_v3(uchar cp[3], const uchar cpstate[3], const float fac)
{
  if (fac != 0.0f) {
    cp[0] = (int)((1.0f - fac) * cp[0] + fac * cpstate[0]);
    cp[1] = (int)((1.0f - fac) * cp[1] + fac * cpstate[1]);
    cp[2] = (int)((1.0f - fac) * cp[2] + fac * cpstate[2]);
  }
}

static void color_blend_v4_v4v4(uchar r_col[4],
                                const uchar col1[4],
                                const uchar col2[4],
                                const float fac)
{
  const int faci = unit_float_to_uchar_clamp(fac);
  const int facm = 255 - faci;

  r_col[0] = (faci * col1[0] + facm * col2[0]) / 256;
  r_col[1] = (faci * col1[1] + facm * col2[1]) / 256;
  r_col[2] = (faci * col1[2] + facm * col2[2]) / 256;
  r_col[3] = (faci * col1[3] + facm * col2[3]) / 256;
}

static void color_add_v3_i(uchar cp[3], int tint)
{
  cp[0] = clamp_i(cp[0] + tint, 0, 255);
  cp[1] = clamp_i(cp[1] + tint, 0, 255);
  cp[2] = clamp_i(cp[2] + tint, 0, 255);
}

static void color_ensure_contrast_v3(uchar cp[3], const uchar cp_other[3], int contrast)
{
  BLI_assert(contrast > 0);
  const int item_value = rgb_to_grayscale_byte(cp);
  const int inner_value = rgb_to_grayscale_byte(cp_other);
  const int delta = item_value - inner_value;
  if (delta >= 0) {
    if (contrast > delta) {
      color_add_v3_i(cp, contrast - delta);
    }
  }
  else {
    if (contrast > -delta) {
      color_add_v3_i(cp, -contrast - delta);
    }
  }
}

static void color_mul_hsl_v3(uchar ch[3], float h_factor, float s_factor, float l_factor)
{
  float rgb[3], hsl[3];
  rgb_uchar_to_float(rgb, ch);
  rgb_to_hsl_v(rgb, hsl);
  hsl[0] *= h_factor;
  hsl[1] *= s_factor;
  hsl[2] *= l_factor;
  hsl_to_rgb_v(hsl, rgb);
  rgb_float_to_uchar(ch, rgb);
}

/** \} */

/* -------------------------------------------------------------------- */
/** \name Widget Base Type
 * \{ */

/**
 * - in: roundbox codes for corner types and radius
 * - return: array of `[size][2][x, y]` points, the edges of the roundbox, + UV coords
 *
 * - draw black box with alpha 0 on exact button boundbox
 * - for every AA step:
 *    - draw the inner part for a round filled box, with color blend codes or texture coords
 *    - draw outline in outline color
 *    - draw outer part, bottom half, extruded 1 pixel to bottom, for emboss shadow
 *    - draw extra decorations
 * - draw background color box with alpha 1 on exact button boundbox
 */

/* fill this struct with polygon info to draw AA'ed */
/* it has outline, back, and two optional tria meshes */

typedef struct uiWidgetTrias {
  uint tot;
  int type;
  float size, center[2];

  float vec[16][2];
  const uint (*index)[3];

} uiWidgetTrias;

/* max as used by round_box__edges */
/* Make sure to change widget_base_vert.glsl accordingly. */
#define WIDGET_CURVE_RESOLU 9
#define WIDGET_SIZE_MAX (WIDGET_CURVE_RESOLU * 4)

typedef struct uiWidgetBase {
  /* TODO: remove these completely. */
  int totvert, halfwayvert;
  float outer_v[WIDGET_SIZE_MAX][2];
  float inner_v[WIDGET_SIZE_MAX][2];
  float inner_uv[WIDGET_SIZE_MAX][2];

  bool draw_inner, draw_outline, draw_emboss;

  uiWidgetTrias tria1;
  uiWidgetTrias tria2;

  /* Widget shader parameters, must match the shader layout. */
  uiWidgetBaseParameters uniform_params;
} uiWidgetBase;

/**
 * For time being only for visual appearance,
 * later, a handling callback can be added too.
 */
typedef struct uiWidgetType {

  /* pointer to theme color definition */
  const uiWidgetColors *wcol_theme;
  uiWidgetStateColors *wcol_state;

  /* converted colors for state */
  uiWidgetColors wcol;

  void (*state)(struct uiWidgetType *, int state, int drawflag, eUIEmbossType emboss);
  void (*draw)(uiWidgetColors *, rcti *, int state, int roundboxalign);
  void (*custom)(uiBut *, uiWidgetColors *, rcti *, int state, int roundboxalign);
  void (*text)(const uiFontStyle *, const uiWidgetColors *, uiBut *, rcti *);

} uiWidgetType;

/** \} */

/* -------------------------------------------------------------------- */
/** \name Shape Preset Data
 * \{ */

static const float cornervec[WIDGET_CURVE_RESOLU][2] = {
    {0.0, 0.0},
    {0.195, 0.02},
    {0.383, 0.067},
    {0.55, 0.169},
    {0.707, 0.293},
    {0.831, 0.45},
    {0.924, 0.617},
    {0.98, 0.805},
    {1.0, 1.0},
};

const float ui_pixel_jitter[UI_PIXEL_AA_JITTER][2] = {
    {0.468813, -0.481430},
    {-0.155755, -0.352820},
    {0.219306, -0.238501},
    {-0.393286, -0.110949},
    {-0.024699, 0.013908},
    {0.343805, 0.147431},
    {-0.272855, 0.269918},
    {0.095909, 0.388710},
};
#define WIDGET_AA_JITTER UI_PIXEL_AA_JITTER
#define jit ui_pixel_jitter

static const float g_shape_preset_number_arrow_vert[3][2] = {
    {-0.352077, 0.532607},
    {-0.352077, -0.549313},
    {0.330000, -0.008353},
};
static const uint g_shape_preset_number_arrow_face[1][3] = {
    {0, 1, 2},
};

static const float g_shape_preset_scroll_circle_vert[16][2] = {
    {0.382684, 0.923879},
    {0.000001, 1.000000},
    {-0.382683, 0.923880},
    {-0.707107, 0.707107},
    {-0.923879, 0.382684},
    {-1.000000, 0.000000},
    {-0.923880, -0.382684},
    {-0.707107, -0.707107},
    {-0.382683, -0.923880},
    {0.000000, -1.000000},
    {0.382684, -0.923880},
    {0.707107, -0.707107},
    {0.923880, -0.382684},
    {1.000000, -0.000000},
    {0.923880, 0.382683},
    {0.707107, 0.707107},
};
static const uint g_shape_preset_scroll_circle_face[14][3] = {
    {0, 1, 2},
    {2, 0, 3},
    {3, 0, 15},
    {3, 15, 4},
    {4, 15, 14},
    {4, 14, 5},
    {5, 14, 13},
    {5, 13, 6},
    {6, 13, 12},
    {6, 12, 7},
    {7, 12, 11},
    {7, 11, 8},
    {8, 11, 10},
    {8, 10, 9},
};

static const float g_shape_preset_menu_arrow_vert[6][2] = {
    {-0.33, 0.16},
    {0.33, 0.16},
    {0, 0.82},
    {0, -0.82},
    {-0.33, -0.16},
    {0.33, -0.16},
};
static const uint g_shape_preset_menu_arrow_face[2][3] = {{2, 0, 1}, {3, 5, 4}};

static const float g_shape_preset_checkmark_vert[6][2] = {
    {-0.578579, 0.253369},
    {-0.392773, 0.412794},
    {-0.004241, -0.328551},
    {-0.003001, 0.034320},
    {1.055313, 0.864744},
    {0.866408, 1.026895},
};

static const uint g_shape_preset_checkmark_face[4][3] = {
    {3, 2, 4},
    {3, 4, 5},
    {1, 0, 3},
    {0, 2, 3},
};

#define OY (-0.2 / 2)
#define SC (0.35 * 2)
static const float g_shape_preset_hold_action_vert[6][2] = {
    {-0.5 + SC, 1.0 + OY},
    {0.5, 1.0 + OY},
    {0.5, 0.0 + OY + SC},
};
static const uint g_shape_preset_hold_action_face[2][3] = {{2, 0, 1}, {3, 5, 4}};
#undef OY
#undef SC

/** \} */

/* -------------------------------------------------------------------- */
/** \name #GPUBatch Creation
 *
 * In order to speed up UI drawing we create some batches that are then
 * modified by specialized shaders to draw certain elements really fast.
 * TODO: find a better place. Maybe its own file?
 *
 * \{ */

static struct {
  GPUBatch *roundbox_widget;
  GPUBatch *roundbox_shadow;

  /* TODO: remove. */
  GPUVertFormat format;
  uint vflag_id;
} g_ui_batch_cache = {0};

static GPUVertFormat *vflag_format(void)
{
  if (g_ui_batch_cache.format.attr_len == 0) {
    GPUVertFormat *format = &g_ui_batch_cache.format;
    g_ui_batch_cache.vflag_id = GPU_vertformat_attr_add(
        format, "vflag", GPU_COMP_U32, 1, GPU_FETCH_INT);
  }
  return &g_ui_batch_cache.format;
}

#define INNER 0
#define OUTLINE 1
#define EMBOSS 2
#define NO_AA 0

static void set_roundbox_vertex_data(GPUVertBufRaw *vflag_step, uint32_t d)
{
  uint32_t *data = GPU_vertbuf_raw_step(vflag_step);
  *data = d;
}

static uint32_t set_roundbox_vertex(GPUVertBufRaw *vflag_step,
                                    int corner_id,
                                    int corner_v,
                                    int jit_v,
                                    bool inner,
                                    bool emboss,
                                    int color)
{
  uint32_t *data = GPU_vertbuf_raw_step(vflag_step);
  *data = corner_id;
  *data |= corner_v << 2;
  *data |= jit_v << 6;
  *data |= color << 12;
  *data |= (inner) ? (1 << 10) : 0;  /* is inner vert */
  *data |= (emboss) ? (1 << 11) : 0; /* is emboss vert */
  return *data;
}

GPUBatch *ui_batch_roundbox_widget_get(void)
{
  if (g_ui_batch_cache.roundbox_widget == NULL) {
    GPUVertBuf *vbo = GPU_vertbuf_create_with_format(vflag_format());

    GPU_vertbuf_data_alloc(vbo, 12);

    GPUIndexBufBuilder ibuf;
    GPU_indexbuf_init(&ibuf, GPU_PRIM_TRIS, 6, 12);
    /* Widget */
    GPU_indexbuf_add_tri_verts(&ibuf, 0, 1, 2);
    GPU_indexbuf_add_tri_verts(&ibuf, 2, 1, 3);
    /* Trias */
    GPU_indexbuf_add_tri_verts(&ibuf, 4, 5, 6);
    GPU_indexbuf_add_tri_verts(&ibuf, 6, 5, 7);

    GPU_indexbuf_add_tri_verts(&ibuf, 8, 9, 10);
    GPU_indexbuf_add_tri_verts(&ibuf, 10, 9, 11);

    g_ui_batch_cache.roundbox_widget = GPU_batch_create_ex(
        GPU_PRIM_TRIS, vbo, GPU_indexbuf_build(&ibuf), GPU_BATCH_OWNS_INDEX | GPU_BATCH_OWNS_VBO);
    gpu_batch_presets_register(g_ui_batch_cache.roundbox_widget);
  }
  return g_ui_batch_cache.roundbox_widget;
}

GPUBatch *ui_batch_roundbox_shadow_get(void)
{
  if (g_ui_batch_cache.roundbox_shadow == NULL) {
    uint32_t last_data;
    GPUVertBufRaw vflag_step;
    GPUVertBuf *vbo = GPU_vertbuf_create_with_format(vflag_format());
    const int vcount = (WIDGET_SIZE_MAX + 1) * 2 + 2 + WIDGET_SIZE_MAX;
    GPU_vertbuf_data_alloc(vbo, vcount);
    GPU_vertbuf_attr_get_raw_data(vbo, g_ui_batch_cache.vflag_id, &vflag_step);

    for (int c = 0; c < 4; c++) {
      for (int a = 0; a < WIDGET_CURVE_RESOLU; a++) {
        set_roundbox_vertex(&vflag_step, c, a, NO_AA, true, false, INNER);
        set_roundbox_vertex(&vflag_step, c, a, NO_AA, false, false, INNER);
      }
    }
    /* close loop */
    last_data = set_roundbox_vertex(&vflag_step, 0, 0, NO_AA, true, false, INNER);
    last_data = set_roundbox_vertex(&vflag_step, 0, 0, NO_AA, false, false, INNER);
    /* restart */
    set_roundbox_vertex_data(&vflag_step, last_data);
    set_roundbox_vertex(&vflag_step, 0, 0, NO_AA, true, false, INNER);
    /* filled */
    for (int c1 = 0, c2 = 3; c1 < 2; c1++, c2--) {
      for (int a1 = 0, a2 = WIDGET_CURVE_RESOLU - 1; a2 >= 0; a1++, a2--) {
        set_roundbox_vertex(&vflag_step, c1, a1, NO_AA, true, false, INNER);
        set_roundbox_vertex(&vflag_step, c2, a2, NO_AA, true, false, INNER);
      }
    }
    g_ui_batch_cache.roundbox_shadow = GPU_batch_create_ex(
        GPU_PRIM_TRI_STRIP, vbo, NULL, GPU_BATCH_OWNS_VBO);
    gpu_batch_presets_register(g_ui_batch_cache.roundbox_shadow);
  }
  return g_ui_batch_cache.roundbox_shadow;
}

#undef INNER
#undef OUTLINE
#undef EMBOSS
#undef NO_AA

/** \} */

/* -------------------------------------------------------------------- */
/** \name Draw Triangle Arrow
 * \{ */

void UI_draw_anti_tria(
    float x1, float y1, float x2, float y2, float x3, float y3, const float color[4])
{
  const float tri_arr[3][2] = {{x1, y1}, {x2, y2}, {x3, y3}};

  float draw_color[4];
  copy_v4_v4(draw_color, color);
  /* NOTE: This won't give back the original color. */
  draw_color[3] *= 1.0f / WIDGET_AA_JITTER;

  GPU_blend(GPU_BLEND_ALPHA);

  const uint pos = GPU_vertformat_attr_add(
      immVertexFormat(), "pos", GPU_COMP_F32, 2, GPU_FETCH_FLOAT);
  immBindBuiltinProgram(GPU_SHADER_2D_UNIFORM_COLOR);

  immUniformColor4fv(draw_color);
  immBegin(GPU_PRIM_TRIS, 3 * WIDGET_AA_JITTER);

  /* for each AA step */
  for (int j = 0; j < WIDGET_AA_JITTER; j++) {
    immVertex2f(pos, tri_arr[0][0] + jit[j][0], tri_arr[0][1] + jit[j][1]);
    immVertex2f(pos, tri_arr[1][0] + jit[j][0], tri_arr[1][1] + jit[j][1]);
    immVertex2f(pos, tri_arr[2][0] + jit[j][0], tri_arr[2][1] + jit[j][1]);
  }

  immEnd();

  immUnbindProgram();

  GPU_blend(GPU_BLEND_NONE);
}

/* Triangle 'icon' for panel header and other cases. */
void UI_draw_icon_tri(float x, float y, char dir, const float color[4])
{
  const float f3 = 0.05 * U.widget_unit;
  const float f5 = 0.15 * U.widget_unit;
  const float f7 = 0.25 * U.widget_unit;

  if (dir == 'h') {
    UI_draw_anti_tria(x - f3, y - f5, x - f3, y + f5, x + f7, y, color);
  }
  else if (dir == 't') {
    UI_draw_anti_tria(x - f5, y - f7, x + f5, y - f7, x, y + f3, color);
  }
  else { /* 'v' = vertical, down. */
    UI_draw_anti_tria(x - f5, y + f3, x + f5, y + f3, x, y - f7, color);
  }
}

/* triangle 'icon' inside rect */
void ui_draw_anti_tria_rect(const rctf *rect, char dir, const float color[4])
{
  if (dir == 'h') {
    const float half = 0.5f * BLI_rctf_size_y(rect);
    UI_draw_anti_tria(
        rect->xmin, rect->ymin, rect->xmin, rect->ymax, rect->xmax, rect->ymin + half, color);
  }
  else {
    const float half = 0.5f * BLI_rctf_size_x(rect);
    UI_draw_anti_tria(
        rect->xmin, rect->ymax, rect->xmax, rect->ymax, rect->xmin + half, rect->ymin, color);
  }
}

void UI_draw_anti_fan(float tri_array[][2], uint length, const float color[4])
{
  float draw_color[4];

  copy_v4_v4(draw_color, color);
  draw_color[3] *= 2.0f / WIDGET_AA_JITTER;

  GPU_blend(GPU_BLEND_ALPHA);

  const uint pos = GPU_vertformat_attr_add(
      immVertexFormat(), "pos", GPU_COMP_F32, 2, GPU_FETCH_FLOAT);
  immBindBuiltinProgram(GPU_SHADER_2D_UNIFORM_COLOR);

  immUniformColor4fv(draw_color);

  /* for each AA step */
  for (int j = 0; j < WIDGET_AA_JITTER; j++) {
    immBegin(GPU_PRIM_TRI_FAN, length);
    immVertex2f(pos, tri_array[0][0], tri_array[0][1]);
    immVertex2f(pos, tri_array[1][0], tri_array[1][1]);

    /* We jitter only the middle of the fan, the extremes are pinned. */
    for (int i = 2; i < length - 1; i++) {
      immVertex2f(pos, tri_array[i][0] + jit[j][0], tri_array[i][1] + jit[j][1]);
    }

    immVertex2f(pos, tri_array[length - 1][0], tri_array[length - 1][1]);
    immEnd();
  }

  immUnbindProgram();

  GPU_blend(GPU_BLEND_NONE);
}

static void widget_init(uiWidgetBase *wtb)
{
  wtb->totvert = wtb->halfwayvert = 0;
  wtb->tria1.tot = 0;
  wtb->tria2.tot = 0;
  wtb->tria1.type = ROUNDBOX_TRIA_NONE;
  wtb->tria1.size = 0;
  wtb->tria2.size = 0;

  wtb->draw_inner = true;
  wtb->draw_outline = true;
  wtb->draw_emboss = true;

  wtb->uniform_params.shade_dir = 1.0f;
  wtb->uniform_params.alpha_discard = 1.0f;
}

/** \} */

/* -------------------------------------------------------------------- */
/** \name Draw Round Box
 * \{ */

/* helper call, makes shadow rect, with 'sun' above menu, so only shadow to left/right/bottom */
/* return tot */
static int round_box_shadow_edges(
    float (*vert)[2], const rcti *rect, float rad, int roundboxalign, float step)
{
  float vec[WIDGET_CURVE_RESOLU][2];
  int tot = 0;

  rad += step;

  if (2.0f * rad > BLI_rcti_size_y(rect)) {
    rad = 0.5f * BLI_rcti_size_y(rect);
  }

  const float minx = rect->xmin - step;
  const float miny = rect->ymin - step;
  const float maxx = rect->xmax + step;
  const float maxy = rect->ymax + step;

  /* Multiply. */
  for (int a = 0; a < WIDGET_CURVE_RESOLU; a++) {
    vec[a][0] = rad * cornervec[a][0];
    vec[a][1] = rad * cornervec[a][1];
  }

  /* start with left-top, anti clockwise */
  if (roundboxalign & UI_CNR_TOP_LEFT) {
    for (int a = 0; a < WIDGET_CURVE_RESOLU; a++, tot++) {
      vert[tot][0] = minx + rad - vec[a][0];
      vert[tot][1] = maxy - vec[a][1];
    }
  }
  else {
    for (int a = 0; a < WIDGET_CURVE_RESOLU; a++, tot++) {
      vert[tot][0] = minx;
      vert[tot][1] = maxy;
    }
  }

  if (roundboxalign & UI_CNR_BOTTOM_LEFT) {
    for (int a = 0; a < WIDGET_CURVE_RESOLU; a++, tot++) {
      vert[tot][0] = minx + vec[a][1];
      vert[tot][1] = miny + rad - vec[a][0];
    }
  }
  else {
    for (int a = 0; a < WIDGET_CURVE_RESOLU; a++, tot++) {
      vert[tot][0] = minx;
      vert[tot][1] = miny;
    }
  }

  if (roundboxalign & UI_CNR_BOTTOM_RIGHT) {
    for (int a = 0; a < WIDGET_CURVE_RESOLU; a++, tot++) {
      vert[tot][0] = maxx - rad + vec[a][0];
      vert[tot][1] = miny + vec[a][1];
    }
  }
  else {
    for (int a = 0; a < WIDGET_CURVE_RESOLU; a++, tot++) {
      vert[tot][0] = maxx;
      vert[tot][1] = miny;
    }
  }

  if (roundboxalign & UI_CNR_TOP_RIGHT) {
    for (int a = 0; a < WIDGET_CURVE_RESOLU; a++, tot++) {
      vert[tot][0] = maxx - vec[a][1];
      vert[tot][1] = maxy - rad + vec[a][0];
    }
  }
  else {
    for (int a = 0; a < WIDGET_CURVE_RESOLU; a++, tot++) {
      vert[tot][0] = maxx;
      vert[tot][1] = maxy;
    }
  }
  return tot;
}

/* this call has 1 extra arg to allow mask outline */
static void round_box__edges(
    uiWidgetBase *wt, int roundboxalign, const rcti *rect, float rad, float radi)
{
  float vec[WIDGET_CURVE_RESOLU][2], veci[WIDGET_CURVE_RESOLU][2];
  const float minx = rect->xmin, miny = rect->ymin, maxx = rect->xmax, maxy = rect->ymax;
  const float minxi = minx + U.pixelsize; /* boundbox inner */
  const float maxxi = maxx - U.pixelsize;
  const float minyi = miny + U.pixelsize;
  const float maxyi = maxy - U.pixelsize;
  /* for uv, can divide by zero */
  const float facxi = (maxxi != minxi) ? 1.0f / (maxxi - minxi) : 0.0f;
  const float facyi = (maxyi != minyi) ? 1.0f / (maxyi - minyi) : 0.0f;
  int tot = 0;
  const int hnum = ((roundboxalign & (UI_CNR_TOP_LEFT | UI_CNR_TOP_RIGHT)) ==
                        (UI_CNR_TOP_LEFT | UI_CNR_TOP_RIGHT) ||
                    (roundboxalign & (UI_CNR_BOTTOM_RIGHT | UI_CNR_BOTTOM_LEFT)) ==
                        (UI_CNR_BOTTOM_RIGHT | UI_CNR_BOTTOM_LEFT)) ?
                       1 :
                       2;
  const int vnum = ((roundboxalign & (UI_CNR_TOP_LEFT | UI_CNR_BOTTOM_LEFT)) ==
                        (UI_CNR_TOP_LEFT | UI_CNR_BOTTOM_LEFT) ||
                    (roundboxalign & (UI_CNR_TOP_RIGHT | UI_CNR_BOTTOM_RIGHT)) ==
                        (UI_CNR_TOP_RIGHT | UI_CNR_BOTTOM_RIGHT)) ?
                       1 :
                       2;

  const int minsize = min_ii(BLI_rcti_size_x(rect) * hnum, BLI_rcti_size_y(rect) * vnum);

  if (2.0f * rad > minsize) {
    rad = 0.5f * minsize;
  }

  if (2.0f * (radi + 1.0f) > minsize) {
    radi = 0.5f * minsize - U.pixelsize;
  }

  wt->uniform_params.rad = rad;
  wt->uniform_params.radi = radi;
  wt->uniform_params.facxi = facxi;
  wt->uniform_params.facyi = facyi;
  wt->uniform_params.round_corners[0] = (roundboxalign & UI_CNR_BOTTOM_LEFT) ? 1.0f : 0.0f;
  wt->uniform_params.round_corners[1] = (roundboxalign & UI_CNR_BOTTOM_RIGHT) ? 1.0f : 0.0f;
  wt->uniform_params.round_corners[2] = (roundboxalign & UI_CNR_TOP_RIGHT) ? 1.0f : 0.0f;
  wt->uniform_params.round_corners[3] = (roundboxalign & UI_CNR_TOP_LEFT) ? 1.0f : 0.0f;
  BLI_rctf_rcti_copy(&wt->uniform_params.rect, rect);
  BLI_rctf_init(&wt->uniform_params.recti, minxi, maxxi, minyi, maxyi);

  /* Multiply by radius. */
  for (int a = 0; a < WIDGET_CURVE_RESOLU; a++) {
    veci[a][0] = radi * cornervec[a][0];
    veci[a][1] = radi * cornervec[a][1];
    vec[a][0] = rad * cornervec[a][0];
    vec[a][1] = rad * cornervec[a][1];
  }

  /* corner left-bottom */
  if (roundboxalign & UI_CNR_BOTTOM_LEFT) {
    for (int a = 0; a < WIDGET_CURVE_RESOLU; a++, tot++) {
      wt->inner_v[tot][0] = minxi + veci[a][1];
      wt->inner_v[tot][1] = minyi + radi - veci[a][0];

      wt->outer_v[tot][0] = minx + vec[a][1];
      wt->outer_v[tot][1] = miny + rad - vec[a][0];

      wt->inner_uv[tot][0] = facxi * (wt->inner_v[tot][0] - minxi);
      wt->inner_uv[tot][1] = facyi * (wt->inner_v[tot][1] - minyi);
    }
  }
  else {
    wt->inner_v[tot][0] = minxi;
    wt->inner_v[tot][1] = minyi;

    wt->outer_v[tot][0] = minx;
    wt->outer_v[tot][1] = miny;

    wt->inner_uv[tot][0] = 0.0f;
    wt->inner_uv[tot][1] = 0.0f;

    tot++;
  }

  /* corner right-bottom */
  if (roundboxalign & UI_CNR_BOTTOM_RIGHT) {
    for (int a = 0; a < WIDGET_CURVE_RESOLU; a++, tot++) {
      wt->inner_v[tot][0] = maxxi - radi + veci[a][0];
      wt->inner_v[tot][1] = minyi + veci[a][1];

      wt->outer_v[tot][0] = maxx - rad + vec[a][0];
      wt->outer_v[tot][1] = miny + vec[a][1];

      wt->inner_uv[tot][0] = facxi * (wt->inner_v[tot][0] - minxi);
      wt->inner_uv[tot][1] = facyi * (wt->inner_v[tot][1] - minyi);
    }
  }
  else {
    wt->inner_v[tot][0] = maxxi;
    wt->inner_v[tot][1] = minyi;

    wt->outer_v[tot][0] = maxx;
    wt->outer_v[tot][1] = miny;

    wt->inner_uv[tot][0] = 1.0f;
    wt->inner_uv[tot][1] = 0.0f;

    tot++;
  }

  wt->halfwayvert = tot;

  /* corner right-top */
  if (roundboxalign & UI_CNR_TOP_RIGHT) {
    for (int a = 0; a < WIDGET_CURVE_RESOLU; a++, tot++) {
      wt->inner_v[tot][0] = maxxi - veci[a][1];
      wt->inner_v[tot][1] = maxyi - radi + veci[a][0];

      wt->outer_v[tot][0] = maxx - vec[a][1];
      wt->outer_v[tot][1] = maxy - rad + vec[a][0];

      wt->inner_uv[tot][0] = facxi * (wt->inner_v[tot][0] - minxi);
      wt->inner_uv[tot][1] = facyi * (wt->inner_v[tot][1] - minyi);
    }
  }
  else {
    wt->inner_v[tot][0] = maxxi;
    wt->inner_v[tot][1] = maxyi;

    wt->outer_v[tot][0] = maxx;
    wt->outer_v[tot][1] = maxy;

    wt->inner_uv[tot][0] = 1.0f;
    wt->inner_uv[tot][1] = 1.0f;

    tot++;
  }

  /* corner left-top */
  if (roundboxalign & UI_CNR_TOP_LEFT) {
    for (int a = 0; a < WIDGET_CURVE_RESOLU; a++, tot++) {
      wt->inner_v[tot][0] = minxi + radi - veci[a][0];
      wt->inner_v[tot][1] = maxyi - veci[a][1];

      wt->outer_v[tot][0] = minx + rad - vec[a][0];
      wt->outer_v[tot][1] = maxy - vec[a][1];

      wt->inner_uv[tot][0] = facxi * (wt->inner_v[tot][0] - minxi);
      wt->inner_uv[tot][1] = facyi * (wt->inner_v[tot][1] - minyi);
    }
  }
  else {
    wt->inner_v[tot][0] = minxi;
    wt->inner_v[tot][1] = maxyi;

    wt->outer_v[tot][0] = minx;
    wt->outer_v[tot][1] = maxy;

    wt->inner_uv[tot][0] = 0.0f;
    wt->inner_uv[tot][1] = 1.0f;

    tot++;
  }

  BLI_assert(tot <= WIDGET_SIZE_MAX);

  wt->totvert = tot;
}

static void round_box_edges(uiWidgetBase *wt, int roundboxalign, const rcti *rect, float rad)
{
  round_box__edges(wt, roundboxalign, rect, rad, rad - U.pixelsize);
}

/** \} */

/* -------------------------------------------------------------------- */
/** \name Shape Preset Mini API
 * \{ */

/* based on button rect, return scaled array of triangles */
static void shape_preset_init_trias_ex(uiWidgetTrias *tria,
                                       const rcti *rect,
                                       float triasize,
                                       char where,
                                       /* input data */
                                       const float verts[][2],
                                       const int verts_tot,
                                       const uint tris[][3],
                                       const int tris_tot)
{
  float sizex, sizey;
  int i1 = 0, i2 = 1;

  const float minsize = ELEM(where, 'r', 'l') ? BLI_rcti_size_y(rect) : BLI_rcti_size_x(rect);

  /* center position and size */
  float centx = (float)rect->xmin + 0.4f * minsize;
  float centy = (float)rect->ymin + 0.5f * minsize;
  tria->size = sizex = sizey = -0.5f * triasize * minsize;

  if (where == 'r') {
    centx = (float)rect->xmax - 0.4f * minsize;
    sizex = -sizex;
  }
  else if (where == 't') {
    centx = (float)rect->xmin + 0.5f * minsize;
    centy = (float)rect->ymax - 0.5f * minsize;
    sizey = -sizey;
    i2 = 0;
    i1 = 1;
  }
  else if (where == 'b') {
    centx = (float)rect->xmin + 0.5f * minsize;
    sizex = -sizex;
    i2 = 0;
    i1 = 1;
  }

  for (int a = 0; a < verts_tot; a++) {
    tria->vec[a][0] = sizex * verts[a][i1] + centx;
    tria->vec[a][1] = sizey * verts[a][i2] + centy;
  }

  tria->center[0] = centx;
  tria->center[1] = centy;

  tria->tot = tris_tot;
  tria->index = tris;
}

static void shape_preset_init_number_arrows(uiWidgetTrias *tria,
                                            const rcti *rect,
                                            float triasize,
                                            char where)
{
  tria->type = ROUNDBOX_TRIA_ARROWS;
  shape_preset_init_trias_ex(tria,
                             rect,
                             triasize,
                             where,
                             g_shape_preset_number_arrow_vert,
                             ARRAY_SIZE(g_shape_preset_number_arrow_vert),
                             g_shape_preset_number_arrow_face,
                             ARRAY_SIZE(g_shape_preset_number_arrow_face));
}

static void shape_preset_init_hold_action(uiWidgetTrias *tria,
                                          const rcti *rect,
                                          float triasize,
                                          char where)
{
  tria->type = ROUNDBOX_TRIA_HOLD_ACTION_ARROW;
  /* With the current changes to use batches for widget drawing, the code
   * below is doing almost nothing effectively. 'where' doesn't work either,
   * shader is currently hardcoded to work for the button triangle pointing
   * at the lower right. The same limitation applies to other trias as well.
   * XXX Should be addressed. */
  shape_preset_init_trias_ex(tria,
                             rect,
                             triasize,
                             where,
                             g_shape_preset_hold_action_vert,
                             ARRAY_SIZE(g_shape_preset_hold_action_vert),
                             g_shape_preset_hold_action_face,
                             ARRAY_SIZE(g_shape_preset_hold_action_face));
}

static void shape_preset_init_scroll_circle(uiWidgetTrias *tria,
                                            const rcti *rect,
                                            float triasize,
                                            char where)
{
  tria->type = ROUNDBOX_TRIA_SCROLL;
  shape_preset_init_trias_ex(tria,
                             rect,
                             triasize,
                             where,
                             g_shape_preset_scroll_circle_vert,
                             ARRAY_SIZE(g_shape_preset_scroll_circle_vert),
                             g_shape_preset_scroll_circle_face,
                             ARRAY_SIZE(g_shape_preset_scroll_circle_face));
}

static void widget_draw_vertex_buffer(uint pos,
                                      uint col,
                                      int mode,
                                      const float quads_pos[WIDGET_SIZE_MAX][2],
                                      const uchar quads_col[WIDGET_SIZE_MAX][4],
                                      uint totvert)
{
  immBegin(mode, totvert);
  for (int i = 0; i < totvert; i++) {
    if (quads_col) {
      immAttr4ubv(col, quads_col[i]);
    }
    immVertex2fv(pos, quads_pos[i]);
  }
  immEnd();
}

static void shape_preset_trias_from_rect_menu(uiWidgetTrias *tria, const rcti *rect)
{
  const float width = BLI_rcti_size_x(rect);
  const float height = BLI_rcti_size_y(rect);
  float centx, centy, size;

  tria->type = ROUNDBOX_TRIA_MENU;

  /* Center position and size. */
  tria->center[0] = centx = rect->xmin + 0.52f * BLI_rcti_size_y(rect);
  tria->center[1] = centy = rect->ymin + 0.52f * BLI_rcti_size_y(rect);
  tria->size = size = 0.4f * height;

  if (width > height * 1.1f) {
    /* For wider buttons align tighter to the right. */
    tria->center[0] = centx = rect->xmax - 0.32f * height;
  }

  for (int a = 0; a < 6; a++) {
    tria->vec[a][0] = size * g_shape_preset_menu_arrow_vert[a][0] + centx;
    tria->vec[a][1] = size * g_shape_preset_menu_arrow_vert[a][1] + centy;
  }

  tria->tot = 2;
  tria->index = g_shape_preset_menu_arrow_face;
}

static void shape_preset_trias_from_rect_checkmark(uiWidgetTrias *tria, const rcti *rect)
{
  float centx, centy, size;

  tria->type = ROUNDBOX_TRIA_CHECK;

  /* Center position and size. */
  tria->center[0] = centx = rect->xmin + 0.5f * BLI_rcti_size_y(rect);
  tria->center[1] = centy = rect->ymin + 0.5f * BLI_rcti_size_y(rect);
  tria->size = size = 0.5f * BLI_rcti_size_y(rect);

  for (int a = 0; a < 6; a++) {
    tria->vec[a][0] = size * g_shape_preset_checkmark_vert[a][0] + centx;
    tria->vec[a][1] = size * g_shape_preset_checkmark_vert[a][1] + centy;
  }

  tria->tot = 4;
  tria->index = g_shape_preset_checkmark_face;
}

/** \} */

/* -------------------------------------------------------------------- */
/** \name Widget Base Drawing
 * \{ */

/* prepares shade colors */
static void shadecolors4(
    uchar coltop[4], uchar coldown[4], const uchar *color, short shadetop, short shadedown)
{
  coltop[0] = CLAMPIS(color[0] + shadetop, 0, 255);
  coltop[1] = CLAMPIS(color[1] + shadetop, 0, 255);
  coltop[2] = CLAMPIS(color[2] + shadetop, 0, 255);
  coltop[3] = color[3];

  coldown[0] = CLAMPIS(color[0] + shadedown, 0, 255);
  coldown[1] = CLAMPIS(color[1] + shadedown, 0, 255);
  coldown[2] = CLAMPIS(color[2] + shadedown, 0, 255);
  coldown[3] = color[3];
}

static void widget_verts_to_triangle_strip(uiWidgetBase *wtb,
                                           const int totvert,
                                           float triangle_strip[WIDGET_SIZE_MAX * 2 + 2][2])
{
  int a;
  for (a = 0; a < totvert; a++) {
    copy_v2_v2(triangle_strip[a * 2], wtb->outer_v[a]);
    copy_v2_v2(triangle_strip[a * 2 + 1], wtb->inner_v[a]);
  }
  copy_v2_v2(triangle_strip[a * 2], wtb->outer_v[0]);
  copy_v2_v2(triangle_strip[a * 2 + 1], wtb->inner_v[0]);
}

static void widgetbase_outline(uiWidgetBase *wtb, uint pos)
{
  float triangle_strip[WIDGET_SIZE_MAX * 2 + 2][2]; /* + 2 because the last pair is wrapped */
  widget_verts_to_triangle_strip(wtb, wtb->totvert, triangle_strip);

  widget_draw_vertex_buffer(
      pos, 0, GPU_PRIM_TRI_STRIP, triangle_strip, NULL, wtb->totvert * 2 + 2);
}

static void widgetbase_set_uniform_alpha_discard(uiWidgetBase *wtb,
                                                 const bool alpha_check,
                                                 const float discard_factor)
{
  if (alpha_check) {
    wtb->uniform_params.alpha_discard = -discard_factor;
  }
  else {
    wtb->uniform_params.alpha_discard = discard_factor;
  }
}

static void widgetbase_set_uniform_alpha_check(uiWidgetBase *wtb, const bool alpha_check)
{
  const float discard_factor = fabs(wtb->uniform_params.alpha_discard);
  widgetbase_set_uniform_alpha_discard(wtb, alpha_check, discard_factor);
}

static void widgetbase_set_uniform_discard_factor(uiWidgetBase *wtb, const float discard_factor)
{
  const bool alpha_check = wtb->uniform_params.alpha_discard < 0.0f;
  widgetbase_set_uniform_alpha_discard(wtb, alpha_check, discard_factor);
}

static void widgetbase_set_uniform_colors_ubv(uiWidgetBase *wtb,
                                              const uchar *col1,
                                              const uchar *col2,
                                              const uchar *outline,
                                              const uchar *emboss,
                                              const uchar *tria,
                                              const bool alpha_check)
{
  widgetbase_set_uniform_alpha_check(wtb, alpha_check);
  rgba_float_args_set_ch(wtb->uniform_params.color_inner1, col1[0], col1[1], col1[2], col1[3]);
  rgba_float_args_set_ch(wtb->uniform_params.color_inner2, col2[0], col2[1], col2[2], col2[3]);
  rgba_float_args_set_ch(
      wtb->uniform_params.color_outline, outline[0], outline[1], outline[2], outline[3]);
  rgba_float_args_set_ch(
      wtb->uniform_params.color_emboss, emboss[0], emboss[1], emboss[2], emboss[3]);
  rgba_float_args_set_ch(wtb->uniform_params.color_tria, tria[0], tria[1], tria[2], tria[3]);
}

/** \} */

/* -------------------------------------------------------------------- */
/** \name Widget Base Drawing #GPUBatch Cache
 * \{ */

/* keep in sync with shader */
#define MAX_WIDGET_BASE_BATCH 6
#define MAX_WIDGET_PARAMETERS 12

static struct {
  uiWidgetBaseParameters params[MAX_WIDGET_BASE_BATCH];
  int count;
  bool enabled;
} g_widget_base_batch = {{{{0}}}};

void UI_widgetbase_draw_cache_flush(void)
{
  const float checker_params[3] = {
      UI_ALPHA_CHECKER_DARK / 255.0f, UI_ALPHA_CHECKER_LIGHT / 255.0f, 8.0f};

  if (g_widget_base_batch.count == 0) {
    return;
  }

  GPUBatch *batch = ui_batch_roundbox_widget_get();
  if (g_widget_base_batch.count == 1) {
    /* draw single */
    GPU_batch_program_set_builtin(batch, GPU_SHADER_2D_WIDGET_BASE);
    GPU_batch_uniform_4fv_array(
        batch, "parameters", MAX_WIDGET_PARAMETERS, (const float(*)[4])g_widget_base_batch.params);
    GPU_batch_uniform_3fv(batch, "checkerColorAndSize", checker_params);
    GPU_batch_draw(batch);
  }
  else {
    GPU_batch_program_set_builtin(batch, GPU_SHADER_2D_WIDGET_BASE_INST);
    GPU_batch_uniform_4fv_array(batch,
                                "parameters",
                                MAX_WIDGET_PARAMETERS * MAX_WIDGET_BASE_BATCH,
                                (float(*)[4])g_widget_base_batch.params);
    GPU_batch_uniform_3fv(batch, "checkerColorAndSize", checker_params);
    GPU_batch_draw_instanced(batch, g_widget_base_batch.count);
  }
  g_widget_base_batch.count = 0;
}

void UI_widgetbase_draw_cache_begin(void)
{
  BLI_assert(g_widget_base_batch.enabled == false);
  g_widget_base_batch.enabled = true;
}

void UI_widgetbase_draw_cache_end(void)
{
  BLI_assert(g_widget_base_batch.enabled == true);
  g_widget_base_batch.enabled = false;

  GPU_blend(GPU_BLEND_ALPHA);

  UI_widgetbase_draw_cache_flush();

  GPU_blend(GPU_BLEND_NONE);
}

/* Disable cached/instanced drawing and enforce single widget drawing pipeline.
 * Works around interface artifacts happening on certain driver and hardware
 * configurations. */
static bool draw_widgetbase_batch_skip_draw_cache(void)
{
  /* MacOS is known to have issues on Mac Mini and MacBook Pro with Intel Iris GPU.
   * For example, T78307. */
  if (GPU_type_matches(GPU_DEVICE_INTEL, GPU_OS_MAC, GPU_DRIVER_ANY)) {
    return true;
  }

  return false;
}

static void draw_widgetbase_batch(uiWidgetBase *wtb)
{
  wtb->uniform_params.tria_type = wtb->tria1.type;
  wtb->uniform_params.tria1_size = wtb->tria1.size;
  wtb->uniform_params.tria2_size = wtb->tria2.size;
  copy_v2_v2(wtb->uniform_params.tria1_center, wtb->tria1.center);
  copy_v2_v2(wtb->uniform_params.tria2_center, wtb->tria2.center);

  if (g_widget_base_batch.enabled && !draw_widgetbase_batch_skip_draw_cache()) {
    g_widget_base_batch.params[g_widget_base_batch.count] = wtb->uniform_params;
    g_widget_base_batch.count++;

    if (g_widget_base_batch.count == MAX_WIDGET_BASE_BATCH) {
      UI_widgetbase_draw_cache_flush();
    }
  }
  else {
    const float checker_params[3] = {
        UI_ALPHA_CHECKER_DARK / 255.0f, UI_ALPHA_CHECKER_LIGHT / 255.0f, 8.0f};
    /* draw single */
    GPUBatch *batch = ui_batch_roundbox_widget_get();
    GPU_batch_program_set_builtin(batch, GPU_SHADER_2D_WIDGET_BASE);
    GPU_batch_uniform_4fv_array(
        batch, "parameters", MAX_WIDGET_PARAMETERS, (float(*)[4]) & wtb->uniform_params);
    GPU_batch_uniform_3fv(batch, "checkerColorAndSize", checker_params);
    GPU_batch_draw(batch);
  }
}

static void widgetbase_draw_ex(uiWidgetBase *wtb,
                               const uiWidgetColors *wcol,
                               bool show_alpha_checkers)
{
  uchar inner_col1[4] = {0};
  uchar inner_col2[4] = {0};
  uchar emboss_col[4] = {0};
  uchar outline_col[4] = {0};
  uchar tria_col[4] = {0};
  /* For color widget. */
  if (wcol->shaded != 0) {
    show_alpha_checkers = false;
  }

  /* backdrop non AA */
  if (wtb->draw_inner) {
    if (wcol->shaded == 0) {
      /* simple fill */
      inner_col1[0] = inner_col2[0] = wcol->inner[0];
      inner_col1[1] = inner_col2[1] = wcol->inner[1];
      inner_col1[2] = inner_col2[2] = wcol->inner[2];
      inner_col1[3] = inner_col2[3] = wcol->inner[3];
    }
    else {
      /* gradient fill */
      shadecolors4(inner_col1, inner_col2, wcol->inner, wcol->shadetop, wcol->shadedown);
    }
  }

  if (wtb->draw_outline) {
    outline_col[0] = wcol->outline[0];
    outline_col[1] = wcol->outline[1];
    outline_col[2] = wcol->outline[2];
    outline_col[3] = wcol->outline[3];

    /* emboss bottom shadow */
    if (wtb->draw_emboss) {
      UI_GetThemeColor4ubv(TH_WIDGET_EMBOSS, emboss_col);
    }
  }

  if (wtb->tria1.type != ROUNDBOX_TRIA_NONE) {
    tria_col[0] = wcol->item[0];
    tria_col[1] = wcol->item[1];
    tria_col[2] = wcol->item[2];
    tria_col[3] = wcol->item[3];
  }

  /* Draw everything in one draw-call. */
  if (inner_col1[3] || inner_col2[3] || outline_col[3] || emboss_col[3] || tria_col[3] ||
      show_alpha_checkers) {
    widgetbase_set_uniform_colors_ubv(
        wtb, inner_col1, inner_col2, outline_col, emboss_col, tria_col, show_alpha_checkers);

    GPU_blend(GPU_BLEND_ALPHA);
    draw_widgetbase_batch(wtb);
    GPU_blend(GPU_BLEND_NONE);
  }
}

static void widgetbase_draw(uiWidgetBase *wtb, const uiWidgetColors *wcol)
{
  widgetbase_draw_ex(wtb, wcol, false);
}

/** \} */

/* -------------------------------------------------------------------- */
/** \name Text/Icon Drawing
 * \{ */

#define UI_TEXT_CLIP_MARGIN (0.25f * U.widget_unit / but->block->aspect)

#define PREVIEW_PAD 4

static float widget_alpha_factor(const int state)
{
  if (state & (UI_BUT_INACTIVE | UI_BUT_DISABLED)) {
    if (state & UI_SEARCH_FILTER_NO_MATCH) {
      return 0.25f;
    }
    return 0.5f;
  }

  if (state & UI_SEARCH_FILTER_NO_MATCH) {
    return 0.5f;
  }

  return 1.0f;
}

static void widget_draw_preview(BIFIconID icon, float alpha, const rcti *rect)
{
  if (icon == ICON_NONE) {
    return;
  }

  const int w = BLI_rcti_size_x(rect);
  const int h = BLI_rcti_size_y(rect);
  const int size = MIN2(w, h) - PREVIEW_PAD * 2;

  if (size > 0) {
    const int x = rect->xmin + w / 2 - size / 2;
    const int y = rect->ymin + h / 2 - size / 2;

    UI_icon_draw_preview(x, y, icon, 1.0f, alpha, size);
  }
}

static int ui_but_draw_menu_icon(const uiBut *but)
{
  return (but->flag & UI_BUT_ICON_SUBMENU) && (but->emboss == UI_EMBOSS_PULLDOWN);
}

/* icons have been standardized... and this call draws in untransformed coordinates */

static void widget_draw_icon(
    const uiBut *but, BIFIconID icon, float alpha, const rcti *rect, const uchar mono_color[4])
{
  if (but->flag & UI_BUT_ICON_PREVIEW) {
    GPU_blend(GPU_BLEND_ALPHA);
    widget_draw_preview(icon, alpha, rect);
    GPU_blend(GPU_BLEND_NONE);
    return;
  }

  /* this icon doesn't need draw... */
  if (icon == ICON_BLANK1 && (but->flag & UI_BUT_ICON_SUBMENU) == 0) {
    return;
  }

  const float aspect = but->block->aspect * U.inv_dpi_fac;
  const float height = ICON_DEFAULT_HEIGHT / aspect;

  /* calculate blend color */
  if (ELEM(but->type, UI_BTYPE_TOGGLE, UI_BTYPE_ROW, UI_BTYPE_TOGGLE_N, UI_BTYPE_LISTROW)) {
    if (but->flag & UI_SELECT) {
      /* pass */
    }
    else if (but->flag & UI_ACTIVE) {
      /* pass */
    }
    else {
      alpha = 0.75f;
    }
  }
  else if ((but->type == UI_BTYPE_LABEL)) {
    /* extra feature allows more alpha blending */
    if (but->a1 == 1.0f) {
      alpha *= but->a2;
    }
  }
  else if (ELEM(but->type, UI_BTYPE_BUT, UI_BTYPE_DECORATOR)) {
    alpha *= widget_alpha_factor(but->flag);
  }

  GPU_blend(GPU_BLEND_ALPHA);

  if (icon && icon != ICON_BLANK1) {
    const float ofs = 1.0f / aspect;
    float xs, ys;

    if (but->drawflag & UI_BUT_ICON_LEFT) {
      /* special case - icon_only pie buttons */
      if (ui_block_is_pie_menu(but->block) && !ELEM(but->type, UI_BTYPE_MENU, UI_BTYPE_POPOVER) &&
          but->str && but->str[0] == '\0') {
        xs = rect->xmin + 2.0f * ofs;
      }
      else if (but->emboss == UI_EMBOSS_NONE || but->type == UI_BTYPE_LABEL) {
        xs = rect->xmin + 2.0f * ofs;
      }
      else {
        xs = rect->xmin + 4.0f * ofs;
      }
    }
    else {
      xs = (rect->xmin + rect->xmax - height) / 2.0f;
    }
    ys = (rect->ymin + rect->ymax - height) / 2.0f;

    /* force positions to integers, for zoom levels near 1. draws icons crisp. */
    if (aspect > 0.95f && aspect < 1.05f) {
      xs = (int)(xs + 0.1f);
      ys = (int)(ys + 0.1f);
    }

    /* Get theme color. */
    uchar color[4] = {mono_color[0], mono_color[1], mono_color[2], mono_color[3]};
    const bool has_theme = UI_icon_get_theme_color(icon, color);

    /* to indicate draggable */
    if (but->dragpoin && (but->flag & UI_ACTIVE)) {
      UI_icon_draw_ex(xs, ys, icon, aspect, 1.25f, 0.0f, color, has_theme);
    }
    else if ((but->flag & (UI_ACTIVE | UI_SELECT | UI_SELECT_DRAW))) {
      UI_icon_draw_ex(xs, ys, icon, aspect, alpha, 0.0f, color, has_theme);
    }
    else if (!((but->icon != ICON_NONE) && UI_but_is_tool(but))) {
      if (has_theme) {
        alpha *= 0.8f;
      }
      UI_icon_draw_ex(xs, ys, icon, aspect, alpha, 0.0f, color, has_theme);
    }
    else {
      const bTheme *btheme = UI_GetTheme();
      const float desaturate = 1.0 - btheme->tui.icon_saturation;
      UI_icon_draw_ex(xs, ys, icon, aspect, alpha, desaturate, color, has_theme);
    }
  }

  GPU_blend(GPU_BLEND_NONE);
}

static void widget_draw_submenu_tria(const uiBut *but,
                                     const rcti *rect,
                                     const uiWidgetColors *wcol)
{
  const float aspect = but->block->aspect * U.inv_dpi_fac;
  const int tria_height = (int)(ICON_DEFAULT_HEIGHT / aspect);
  const int tria_width = (int)(ICON_DEFAULT_WIDTH / aspect) - 2 * U.pixelsize;
  const int xs = rect->xmax - tria_width;
  const int ys = (rect->ymin + rect->ymax - tria_height) / 2.0f;

  float col[4];
  rgba_uchar_to_float(col, wcol->text);
  col[3] *= 0.8f;

  rctf tria_rect;
  BLI_rctf_init(&tria_rect, xs, xs + tria_width, ys, ys + tria_height);
  BLI_rctf_scale(&tria_rect, 0.4f);

  GPU_blend(GPU_BLEND_ALPHA);
  UI_widgetbase_draw_cache_flush();
  GPU_blend(GPU_BLEND_NONE);
  ui_draw_anti_tria_rect(&tria_rect, 'h', col);
}

static void ui_text_clip_give_prev_off(uiBut *but, const char *str)
{
  const char *prev_utf8 = BLI_str_find_prev_char_utf8(str + but->ofs, str);
  const int bytes = str + but->ofs - prev_utf8;

  but->ofs -= bytes;
}

static void ui_text_clip_give_next_off(uiBut *but, const char *str, const char *str_end)
{
  const char *next_utf8 = BLI_str_find_next_char_utf8(str + but->ofs, str_end);
  const int bytes = next_utf8 - (str + but->ofs);

  but->ofs += bytes;
}

/**
 * Helper.
 * This func assumes things like kerning handling have already been handled!
 * Return the length of modified (right-clipped + ellipsis) string.
 */
static void ui_text_clip_right_ex(const uiFontStyle *fstyle,
                                  char *str,
                                  const size_t max_len,
                                  const float okwidth,
                                  const char *sep,
                                  const int sep_len,
                                  const float sep_strwidth,
                                  size_t *r_final_len)
{
  BLI_assert(str[0]);

  /* How many BYTES (not characters) of this utf-8 string can fit, along with appended ellipsis. */
  int l_end = BLF_width_to_strlen(fstyle->uifont_id, str, max_len, okwidth - sep_strwidth, NULL);

  if (l_end > 0) {
    /* At least one character, so clip and add the ellipsis. */
    memcpy(str + l_end, sep, sep_len + 1); /* +1 for trailing '\0'. */
    if (r_final_len) {
      *r_final_len = (size_t)(l_end) + sep_len;
    }
  }
  else {
    /* Otherwise fit as much as we can without adding an ellipsis. */
    l_end = BLF_width_to_strlen(fstyle->uifont_id, str, max_len, okwidth, NULL);
    str[l_end] = '\0';
    if (r_final_len) {
      *r_final_len = (size_t)l_end;
    }
  }
}

/**
 * Cut off the middle of the text to fit into the given width.
 *
 * \note in case this middle clipping would just remove a few chars,
 * it rather clips right, which is more readable.
 *
 * If rpart_sep is not Null, the part of str starting to first occurrence of rpart_sep
 * is preserved at all cost.
 * Useful for strings with shortcuts
 * (like 'AVeryLongFooBarLabelForMenuEntry|Ctrl O' -> 'AVeryLong...MenuEntry|Ctrl O').
 */
float UI_text_clip_middle_ex(const uiFontStyle *fstyle,
                             char *str,
                             float okwidth,
                             const float minwidth,
                             const size_t max_len,
                             const char rpart_sep)
{
  /* Add some epsilon to OK width, avoids 'ellipsing' text that nearly fits!
   * Better to have a small piece of the last char cut out,
   * than two remaining chars replaced by an ellipsis... */
  okwidth += 1.0f + UI_DPI_FAC;

  BLI_assert(str[0]);

  /* need to set this first */
  UI_fontstyle_set(fstyle);

  float strwidth = BLF_width(fstyle->uifont_id, str, max_len);

  if ((okwidth > 0.0f) && (strwidth > okwidth)) {
    /* Ellipsis. Some compilers complain with real literal string. */
    const char sep[] = {0xe2, 0x80, 0xA6, 0x0};
    const int sep_len = sizeof(sep) - 1;
    const float sep_strwidth = BLF_width(fstyle->uifont_id, sep, sep_len + 1);

    char *rpart = NULL, rpart_buf[UI_MAX_DRAW_STR];
    float rpart_width = 0.0f;
    size_t rpart_len = 0;
    size_t final_lpart_len;

    if (rpart_sep) {
      rpart = strrchr(str, rpart_sep);

      if (rpart) {
        rpart_len = strlen(rpart);
        rpart_width = BLF_width(fstyle->uifont_id, rpart, rpart_len);
        okwidth -= rpart_width;
        strwidth -= rpart_width;

        if (okwidth < 0.0f) {
          /* Not enough place for actual label, just display protected right part.
           * Here just for safety, should never happen in real life! */
          memmove(str, rpart, rpart_len + 1);
          rpart = NULL;
          okwidth += rpart_width;
          strwidth = rpart_width;
        }
      }
    }

    const float parts_strwidth = (okwidth - sep_strwidth) / 2.0f;

    if (rpart) {
      strcpy(rpart_buf, rpart);
      *rpart = '\0';
      rpart = rpart_buf;
    }

    const size_t l_end = BLF_width_to_strlen(
        fstyle->uifont_id, str, max_len, parts_strwidth, NULL);
    if (l_end < 10 || min_ff(parts_strwidth, strwidth - okwidth) < minwidth) {
      /* If we really have no place, or we would clip a very small piece of string in the middle,
       * only show start of string.
       */
      ui_text_clip_right_ex(
          fstyle, str, max_len, okwidth, sep, sep_len, sep_strwidth, &final_lpart_len);
    }
    else {
      size_t r_offset, r_len;

      r_offset = BLF_width_to_rstrlen(fstyle->uifont_id, str, max_len, parts_strwidth, NULL);
      r_len = strlen(str + r_offset) + 1; /* +1 for the trailing '\0'. */

      if (l_end + sep_len + r_len + rpart_len > max_len) {
        /* Corner case, the str already takes all available mem,
         * and the ellipsis chars would actually add more chars.
         * Better to just trim one or two letters to the right in this case...
         * NOTE: with a single-char ellipsis, this should never happen! But better be safe
         * here...
         */
        ui_text_clip_right_ex(
            fstyle, str, max_len, okwidth, sep, sep_len, sep_strwidth, &final_lpart_len);
      }
      else {
        memmove(str + l_end + sep_len, str + r_offset, r_len);
        memcpy(str + l_end, sep, sep_len);
        /* -1 to remove trailing '\0'! */
        final_lpart_len = (size_t)(l_end + sep_len + r_len - 1);

        while (BLF_width(fstyle->uifont_id, str, max_len) > okwidth) {
          /* This will happen because a lot of string width processing is done in integer pixels,
           * which can introduce a rather high error in the end (about 2 pixels or so).
           * Only one char removal shall ever be needed in real-life situation... */
          r_len--;
          final_lpart_len--;
          char *c = str + l_end + sep_len;
          memmove(c, c + 1, r_len);
        }
      }
    }

    if (rpart) {
      /* Add back preserved right part to our shorten str. */
      memcpy(str + final_lpart_len, rpart, rpart_len + 1); /* +1 for trailing '\0'. */
      okwidth += rpart_width;
    }

    strwidth = BLF_width(fstyle->uifont_id, str, max_len);
  }

  BLI_assert(strwidth <= okwidth);

  return strwidth;
}

/**
 * Wrapper around UI_text_clip_middle_ex.
 */
static void ui_text_clip_middle(const uiFontStyle *fstyle, uiBut *but, const rcti *rect)
{
  /* No margin for labels! */
  const int border = ELEM(but->type, UI_BTYPE_LABEL, UI_BTYPE_MENU, UI_BTYPE_POPOVER) ?
                         0 :
                         (int)(UI_TEXT_CLIP_MARGIN + 0.5f);
  const float okwidth = (float)max_ii(BLI_rcti_size_x(rect) - border, 0);
  const size_t max_len = sizeof(but->drawstr);
  const float minwidth = (float)(UI_DPI_ICON_SIZE) / but->block->aspect * 2.0f;

  but->ofs = 0;
  but->strwidth = UI_text_clip_middle_ex(fstyle, but->drawstr, okwidth, minwidth, max_len, '\0');
}

/**
 * Like #ui_text_clip_middle(), but protect/preserve at all cost
 * the right part of the string after sep.
 * Useful for strings with shortcuts
 * (like 'AVeryLongFooBarLabelForMenuEntry|Ctrl O' -> 'AVeryLong...MenuEntry|Ctrl O').
 */
static void ui_text_clip_middle_protect_right(const uiFontStyle *fstyle,
                                              uiBut *but,
                                              const rcti *rect,
                                              const char rsep)
{
  /* No margin for labels! */
  const int border = ELEM(but->type, UI_BTYPE_LABEL, UI_BTYPE_MENU, UI_BTYPE_POPOVER) ?
                         0 :
                         (int)(UI_TEXT_CLIP_MARGIN + 0.5f);
  const float okwidth = (float)max_ii(BLI_rcti_size_x(rect) - border, 0);
  const size_t max_len = sizeof(but->drawstr);
  const float minwidth = (float)(UI_DPI_ICON_SIZE) / but->block->aspect * 2.0f;

  but->ofs = 0;
  but->strwidth = UI_text_clip_middle_ex(fstyle, but->drawstr, okwidth, minwidth, max_len, rsep);
}

/**
 * Cut off the text, taking into account the cursor location (text display while editing).
 */
static void ui_text_clip_cursor(const uiFontStyle *fstyle, uiBut *but, const rcti *rect)
{
  const int border = (int)(UI_TEXT_CLIP_MARGIN + 0.5f);
  const int okwidth = max_ii(BLI_rcti_size_x(rect) - border, 0);

  BLI_assert(but->editstr && but->pos >= 0);

  /* need to set this first */
  UI_fontstyle_set(fstyle);

  /* define ofs dynamically */
  if (but->ofs > but->pos) {
    but->ofs = but->pos;
  }

  if (BLF_width(fstyle->uifont_id, but->editstr, INT_MAX) <= okwidth) {
    but->ofs = 0;
  }

  but->strwidth = BLF_width(fstyle->uifont_id, but->editstr + but->ofs, INT_MAX);

  if (but->strwidth > okwidth) {
    const int editstr_len = strlen(but->editstr);
    int len = editstr_len;

    while (but->strwidth > okwidth) {
      float width;

      /* string position of cursor */
      width = BLF_width(fstyle->uifont_id, but->editstr + but->ofs, (but->pos - but->ofs));

      /* if cursor is at 20 pixels of right side button we clip left */
      if (width > okwidth - 20) {
        ui_text_clip_give_next_off(but, but->editstr, but->editstr + editstr_len);
      }
      else {
        int bytes;
        /* shift string to the left */
        if (width < 20 && but->ofs > 0) {
          ui_text_clip_give_prev_off(but, but->editstr);
        }
        bytes = BLI_str_utf8_size(BLI_str_find_prev_char_utf8(but->editstr + len, but->editstr));
        if (bytes == -1) {
          bytes = 1;
        }
        len -= bytes;
      }

      but->strwidth = BLF_width(fstyle->uifont_id, but->editstr + but->ofs, len - but->ofs);

      if (but->strwidth < 10) {
        break;
      }
    }
  }
}

/**
 * Cut off the end of text to fit into the width of \a rect.
 *
 * \note deals with ': ' especially for number buttons
 */
static void ui_text_clip_right_label(const uiFontStyle *fstyle, uiBut *but, const rcti *rect)
{
  const int border = UI_TEXT_CLIP_MARGIN + 1;
  const int okwidth = max_ii(BLI_rcti_size_x(rect) - border, 0);
  int drawstr_len = strlen(but->drawstr);
  const char *cpend = but->drawstr + drawstr_len;

  /* need to set this first */
  UI_fontstyle_set(fstyle);

  but->strwidth = BLF_width(fstyle->uifont_id, but->drawstr, sizeof(but->drawstr));
  but->ofs = 0;

  /* First shorten number-buttons eg,
   *   Translucency: 0.000
   * becomes
   *   Trans: 0.000
   */

  /* find the space after ':' separator */
  char *cpoin = strrchr(but->drawstr, ':');

  if (cpoin && (cpoin < cpend - 2)) {
    char *cp2 = cpoin;

    /* chop off the leading text, starting from the right */
    while (but->strwidth > okwidth && cp2 > but->drawstr) {
      const char *prev_utf8 = BLI_str_find_prev_char_utf8(cp2, but->drawstr);
      const int bytes = cp2 - prev_utf8;

      /* shift the text after and including cp2 back by 1 char,
       * +1 to include null terminator */
      memmove(cp2 - bytes, cp2, drawstr_len + 1);
      cp2 -= bytes;

      drawstr_len -= bytes;
      // BLI_assert(strlen(but->drawstr) == drawstr_len);

      but->strwidth = BLF_width(
          fstyle->uifont_id, but->drawstr + but->ofs, sizeof(but->drawstr) - but->ofs);
      if (but->strwidth < 10) {
        break;
      }
    }

    /* after the leading text is gone, chop off the : and following space, with ofs */
    while ((but->strwidth > okwidth) && (but->ofs < 2)) {
      ui_text_clip_give_next_off(but, but->drawstr, but->drawstr + drawstr_len);
      but->strwidth = BLF_width(
          fstyle->uifont_id, but->drawstr + but->ofs, sizeof(but->drawstr) - but->ofs);
      if (but->strwidth < 10) {
        break;
      }
    }
  }

  /* Now just remove trailing chars */
  /* once the label's gone, chop off the least significant digits */
  if (but->strwidth > okwidth) {
    float strwidth;
    drawstr_len = BLF_width_to_strlen(fstyle->uifont_id,
                                      but->drawstr + but->ofs,
                                      drawstr_len - but->ofs,
                                      okwidth,
                                      &strwidth) +
                  but->ofs;
    but->strwidth = strwidth;
    but->drawstr[drawstr_len] = 0;
  }
}

#ifdef WITH_INPUT_IME
static void widget_draw_text_ime_underline(const uiFontStyle *fstyle,
                                           const uiWidgetColors *wcol,
                                           const uiBut *but,
                                           const rcti *rect,
                                           const wmIMEData *ime_data,
                                           const char *drawstr)
{
  int ofs_x, width;
  int rect_x = BLI_rcti_size_x(rect);
  int sel_start = ime_data->sel_start, sel_end = ime_data->sel_end;
  float fcol[4];

  if (drawstr[0] != 0) {
    if (but->pos >= but->ofs) {
      ofs_x = BLF_width(fstyle->uifont_id, drawstr + but->ofs, but->pos - but->ofs);
    }
    else {
      ofs_x = 0;
    }

    width = BLF_width(
        fstyle->uifont_id, drawstr + but->ofs, ime_data->composite_len + but->pos - but->ofs);

    rgba_uchar_to_float(fcol, wcol->text);
    UI_draw_text_underline(rect->xmin + ofs_x,
                           rect->ymin + 6 * U.pixelsize,
                           min_ii(width, rect_x - 2) - ofs_x,
                           1,
                           fcol);

    /* draw the thick line */
    if (sel_start != -1 && sel_end != -1) {
      sel_end -= sel_start;
      sel_start += but->pos;

      if (sel_start >= but->ofs) {
        ofs_x = BLF_width(fstyle->uifont_id, drawstr + but->ofs, sel_start - but->ofs);
      }
      else {
        ofs_x = 0;
      }

      width = BLF_width(fstyle->uifont_id, drawstr + but->ofs, sel_end + sel_start - but->ofs);

      UI_draw_text_underline(rect->xmin + ofs_x,
                             rect->ymin + 6 * U.pixelsize,
                             min_ii(width, rect_x - 2) - ofs_x,
                             2,
                             fcol);
    }
  }
}
#endif /* WITH_INPUT_IME */

struct UnderlineData {
  size_t str_offset;  /* The string offset of the underlined character. */
  int width_px;       /* The underline width in pixels. */
  int r_offset_px[2]; /* Write the X,Y offset here. */
};

static bool widget_draw_text_underline_calc_position(const char *UNUSED(str),
                                                     const size_t str_step_ofs,
                                                     const rcti *glyph_step_bounds,
                                                     const int UNUSED(glyph_advance_x),
                                                     const rctf *glyph_bounds,
                                                     const int UNUSED(glyph_bearing[2]),
                                                     void *user_data)
{
  struct UnderlineData *ul_data = user_data;
  if (ul_data->str_offset == str_step_ofs) {
    /* Full width of this glyph including both bearings. */
    const float width = glyph_bounds->xmin + BLI_rctf_size_x(glyph_bounds) + glyph_bounds->xmin;
    ul_data->r_offset_px[0] = glyph_step_bounds->xmin + ((width - ul_data->width_px) * 0.5f);
    /* One line-width below the lower glyph bounds. */
    ul_data->r_offset_px[1] = glyph_bounds->ymin - U.pixelsize;
    /* Early exit. */
    return false;
  }
  return true;
}

static void widget_draw_text(const uiFontStyle *fstyle,
                             const uiWidgetColors *wcol,
                             uiBut *but,
                             rcti *rect)
{
  int drawstr_left_len = UI_MAX_DRAW_STR;
  const char *drawstr = but->drawstr;
  const char *drawstr_right = NULL;
  bool use_right_only = false;

#ifdef WITH_INPUT_IME
  const wmIMEData *ime_data;
#endif

  UI_fontstyle_set(fstyle);

  eFontStyle_Align align;
  if (but->editstr || (but->drawflag & UI_BUT_TEXT_LEFT)) {
    align = UI_STYLE_TEXT_LEFT;
  }
  else if (but->drawflag & UI_BUT_TEXT_RIGHT) {
    align = UI_STYLE_TEXT_RIGHT;
  }
  else {
    align = UI_STYLE_TEXT_CENTER;
  }

  /* Special case: when we're entering text for multiple buttons,
   * don't draw the text for any of the multi-editing buttons */
  if (UNLIKELY(but->flag & UI_BUT_DRAG_MULTI)) {
    uiBut *but_edit = ui_but_drag_multi_edit_get(but);
    if (but_edit) {
      drawstr = but_edit->editstr;
      align = UI_STYLE_TEXT_LEFT;
    }
  }
  else {
    if (but->editstr) {
      /* max length isn't used in this case,
       * we rely on string being NULL terminated. */
      drawstr_left_len = INT_MAX;

#ifdef WITH_INPUT_IME
      /* FIXME: IME is modifying `const char *drawstr`! */
      ime_data = ui_but_ime_data_get(but);

      if (ime_data && ime_data->composite_len) {
        /* insert composite string into cursor pos */
        BLI_snprintf((char *)drawstr,
                     UI_MAX_DRAW_STR,
                     "%.*s%s%s",
                     but->pos,
                     but->editstr,
                     ime_data->str_composite,
                     but->editstr + but->pos);
      }
      else
#endif
      {
        drawstr = but->editstr;
      }
    }
  }

  /* text button selection, cursor, composite underline */
  if (but->editstr && but->pos != -1) {
    int but_pos_ofs;

#ifdef WITH_INPUT_IME
    bool ime_reposition_window = false;
    int ime_win_x, ime_win_y;
#endif

    /* text button selection */
    if ((but->selend - but->selsta) > 0) {
      int selsta_draw, selwidth_draw;

      if (drawstr[0] != 0) {
        /* We are drawing on top of widget bases. Flush cache. */
        GPU_blend(GPU_BLEND_ALPHA);
        UI_widgetbase_draw_cache_flush();
        GPU_blend(GPU_BLEND_NONE);

        if (but->selsta >= but->ofs) {
          selsta_draw = BLF_width(fstyle->uifont_id, drawstr + but->ofs, but->selsta - but->ofs);
        }
        else {
          selsta_draw = 0;
        }

        selwidth_draw = BLF_width(fstyle->uifont_id, drawstr + but->ofs, but->selend - but->ofs);

        uint pos = GPU_vertformat_attr_add(
            immVertexFormat(), "pos", GPU_COMP_I32, 2, GPU_FETCH_INT_TO_FLOAT);
        immBindBuiltinProgram(GPU_SHADER_2D_UNIFORM_COLOR);

        rcti selection_shape;
        selection_shape.xmin = rect->xmin + selsta_draw;
        selection_shape.xmax = min_ii(rect->xmin + selwidth_draw, rect->xmax - 2);
        selection_shape.ymin = rect->ymin + U.pixelsize;
        selection_shape.ymax = rect->ymax - U.pixelsize;
        immUniformColor4ubv(wcol->item);
        immRecti(pos,
                 selection_shape.xmin,
                 selection_shape.ymin,
                 selection_shape.xmax,
                 selection_shape.ymax);

        immUnbindProgram();

#ifdef WITH_INPUT_IME
        /* IME candidate window uses selection position. */
        if (!ime_reposition_window) {
          ime_reposition_window = true;
          ime_win_x = selection_shape.xmin;
          ime_win_y = selection_shape.ymin;
        }
#endif
      }
    }

    /* text cursor */
    but_pos_ofs = but->pos;

#ifdef WITH_INPUT_IME
    /* If is IME compositing, move the cursor. */
    if (ime_data && ime_data->composite_len && ime_data->cursor_pos != -1) {
      but_pos_ofs += ime_data->cursor_pos;
    }
#endif

    if (but->pos >= but->ofs) {
      int t;
      if (drawstr[0] != 0) {
        t = BLF_width(fstyle->uifont_id, drawstr + but->ofs, but_pos_ofs - but->ofs);
      }
      else {
        t = 0;
      }
      /* We are drawing on top of widget bases. Flush cache. */
      GPU_blend(GPU_BLEND_ALPHA);
      UI_widgetbase_draw_cache_flush();
      GPU_blend(GPU_BLEND_NONE);

      uint pos = GPU_vertformat_attr_add(
          immVertexFormat(), "pos", GPU_COMP_I32, 2, GPU_FETCH_INT_TO_FLOAT);
      immBindBuiltinProgram(GPU_SHADER_2D_UNIFORM_COLOR);

      immUniformThemeColor(TH_WIDGET_TEXT_CURSOR);

      /* Shape of the cursor for drawing. */
      rcti but_cursor_shape;
      but_cursor_shape.xmin = (rect->xmin + t) - U.pixelsize;
      but_cursor_shape.ymin = rect->ymin + U.pixelsize;
      but_cursor_shape.xmax = (rect->xmin + t) + U.pixelsize;
      but_cursor_shape.ymax = rect->ymax - U.pixelsize;

      /* draw cursor */
      immRecti(pos,
               but_cursor_shape.xmin,
               but_cursor_shape.ymin,
               but_cursor_shape.xmax,
               but_cursor_shape.ymax);

      immUnbindProgram();

#ifdef WITH_INPUT_IME
      /* IME candidate window uses cursor position. */
      if (!ime_reposition_window) {
        ime_reposition_window = true;
        ime_win_x = but_cursor_shape.xmax + 5;
        ime_win_y = but_cursor_shape.ymin + 3;
      }
#endif
    }

#ifdef WITH_INPUT_IME
    /* IME cursor following. */
    if (ime_reposition_window) {
      ui_but_ime_reposition(but, ime_win_x, ime_win_y, false);
    }
    if (ime_data && ime_data->composite_len) {
      /* Composite underline. */
      widget_draw_text_ime_underline(fstyle, wcol, but, rect, ime_data, drawstr);
    }
#endif
  }

#if 0
  ui_rasterpos_safe(x, y, but->aspect);
  transopts = ui_translate_buttons();
#endif

  bool use_drawstr_right_as_hint = false;

  /* cut string in 2 parts - only for menu entries */
  if (but->flag & UI_BUT_HAS_SEP_CHAR && (but->editstr == NULL)) {
    drawstr_right = strrchr(drawstr, UI_SEP_CHAR);
    if (drawstr_right) {
      use_drawstr_right_as_hint = true;
      drawstr_left_len = (drawstr_right - drawstr);
      drawstr_right++;
    }
  }

#ifdef USE_NUMBUTS_LR_ALIGN
  if (!drawstr_right && (but->drawflag & UI_BUT_TEXT_LEFT) &&
      ELEM(but->type, UI_BTYPE_NUM, UI_BTYPE_NUM_SLIDER) &&
      /* if we're editing or multi-drag (fake editing), then use left alignment */
      (but->editstr == NULL) && (drawstr == but->drawstr)) {
    drawstr_right = strrchr(drawstr + but->ofs, ':');
    if (drawstr_right) {
      drawstr_right++;
      drawstr_left_len = (drawstr_right - drawstr - 1);

      while (*drawstr_right == ' ') {
        drawstr_right++;
      }
    }
    else {
      /* no prefix, even so use only cpoin */
      drawstr_right = drawstr + but->ofs;
      use_right_only = true;
    }
  }
#endif

  if (!use_right_only) {
    /* for underline drawing */
    int font_xofs, font_yofs;

    int drawlen = (drawstr_left_len == INT_MAX) ? strlen(drawstr + but->ofs) :
                                                  (drawstr_left_len - but->ofs);

    if (drawlen > 0) {
      UI_fontstyle_draw_ex(fstyle,
                           rect,
                           drawstr + but->ofs,
                           wcol->text,
                           &(struct uiFontStyleDraw_Params){
                               .align = align,
                           },
                           drawlen,
                           &font_xofs,
                           &font_yofs,
                           NULL);

      if (but->menu_key != '\0') {
        const char *drawstr_ofs = drawstr + but->ofs;
        int ul_index = -1;

        {
          /* Find upper case, fallback to lower case. */
          const char *drawstr_end = drawstr_ofs + drawlen;
          const char keys[] = {but->menu_key - 32, but->menu_key};
          for (int i = 0; i < ARRAY_SIZE(keys); i++) {
            const char *drawstr_menu = strchr(drawstr_ofs, keys[i]);
            if (drawstr_menu != NULL && drawstr_menu < drawstr_end) {
              ul_index = (int)(drawstr_menu - drawstr_ofs);
              break;
            }
          }
        }

        if (ul_index != -1) {
          int ul_width = round_fl_to_int(BLF_width(fstyle->uifont_id, "_", 2));

          struct UnderlineData ul_data = {
              .str_offset = ul_index,
              .width_px = ul_width,
          };

          BLF_boundbox_foreach_glyph(fstyle->uifont_id,
                                     drawstr_ofs,
                                     ul_index + 1,
                                     widget_draw_text_underline_calc_position,
                                     &ul_data);

          const int pos_x = rect->xmin + font_xofs + ul_data.r_offset_px[0];
          const int pos_y = rect->ymin + font_yofs + ul_data.r_offset_px[1];

          /* Use text output because direct drawing doesn't always work. See T89246. */
          BLF_position(fstyle->uifont_id, pos_x, pos_y, 0.0f);
          BLF_color4ubv(fstyle->uifont_id, wcol->text);
          BLF_draw(fstyle->uifont_id, "_", 2);
        }
      }
    }
  }

  /* part text right aligned */
  if (drawstr_right) {
    uchar col[4];
    copy_v4_v4_uchar(col, wcol->text);
    if (use_drawstr_right_as_hint) {
      col[3] *= 0.5f;
    }

    rect->xmax -= UI_TEXT_CLIP_MARGIN;
    UI_fontstyle_draw(fstyle,
                      rect,
                      drawstr_right,
                      col,
                      &(struct uiFontStyleDraw_Params){
                          .align = UI_STYLE_TEXT_RIGHT,
                      });
  }
}

static void widget_draw_extra_icons(const uiWidgetColors *wcol,
                                    uiBut *but,
                                    rcti *rect,
                                    float alpha)
{
  const float icon_size = ICON_SIZE_FROM_BUTRECT(rect);

  /* Offset of icons from the right edge. Keep in sync
   * with 'ui_but_extra_operator_icon_mouse_over_get'. */
  if (!BLI_listbase_is_empty(&but->extra_op_icons)) {
    /* Eyeballed. */
    rect->xmax -= 0.2 * icon_size;
  }

  /* Inverse order, from right to left. */
  LISTBASE_FOREACH_BACKWARD (uiButExtraOpIcon *, op_icon, &but->extra_op_icons) {
    rcti temp = *rect;
    float alpha_this = alpha;

    temp.xmin = temp.xmax - icon_size;

    if (!op_icon->highlighted) {
      alpha_this *= 0.75f;
    }

    /* Draw the icon at the center, and restore the flags after. */
    const int old_drawflags = but->drawflag;
    UI_but_drawflag_disable(but, UI_BUT_ICON_LEFT);
    widget_draw_icon(but, op_icon->icon, alpha_this, &temp, wcol->text);
    but->drawflag = old_drawflags;

    rect->xmax -= icon_size;
  }
}

static void widget_draw_node_link_socket(const uiWidgetColors *wcol,
                                         const rcti *rect,
                                         uiBut *but,
                                         float alpha)
{
  /* Node socket pointer can be passed as custom_data, see UI_but_node_link_set(). */
  if (but->custom_data) {
    const float scale = 0.9f / but->block->aspect;

    float col[4];
    rgba_uchar_to_float(col, but->col);
    col[3] *= alpha;

    GPU_blend(GPU_BLEND_ALPHA);
    UI_widgetbase_draw_cache_flush();
    GPU_blend(GPU_BLEND_NONE);

    ED_node_socket_draw(but->custom_data, rect, col, scale);
  }
  else {
    widget_draw_icon(but, ICON_LAYER_USED, alpha, rect, wcol->text);
  }
}

/* draws text and icons for buttons */
static void widget_draw_text_icon(const uiFontStyle *fstyle,
                                  const uiWidgetColors *wcol,
                                  uiBut *but,
                                  rcti *rect)
{
  const bool show_menu_icon = ui_but_draw_menu_icon(but);
  const float alpha = (float)wcol->text[3] / 255.0f;
  char password_str[UI_MAX_DRAW_STR];
  bool no_text_padding = but->drawflag & UI_BUT_NO_TEXT_PADDING;

  ui_but_text_password_hide(password_str, but, false);

  /* check for button text label */
  if (ELEM(but->type, UI_BTYPE_MENU, UI_BTYPE_POPOVER) && (but->flag & UI_BUT_NODE_LINK)) {
    rcti temp = *rect;
    const int size = BLI_rcti_size_y(rect) + 1; /* Not the icon size! */

    if (but->drawflag & UI_BUT_ICON_LEFT) {
      temp.xmax = rect->xmin + size;
      rect->xmin = temp.xmax;
      /* Further padding looks off. */
      no_text_padding = true;
    }
    else {
      temp.xmin = rect->xmax - size;
      rect->xmax = temp.xmin;
    }

    widget_draw_node_link_socket(wcol, &temp, but, alpha);
  }

  /* If there's an icon too (made with uiDefIconTextBut) then draw the icon
   * and offset the text label to accommodate it */

  /* Big previews with optional text label below */
  if (but->flag & UI_BUT_ICON_PREVIEW && ui_block_is_menu(but->block)) {
    const BIFIconID icon = ui_but_icon(but);
    int icon_size = BLI_rcti_size_y(rect);
    int text_size = 0;

    /* This is a bit brittle, but avoids adding an 'UI_BUT_HAS_LABEL' flag to but... */
    if (icon_size > BLI_rcti_size_x(rect)) {
      /* button is not square, it has extra height for label */
      text_size = UI_UNIT_Y;
      icon_size -= text_size;
    }

    /* draw icon in rect above the space reserved for the label */
    rect->ymin += text_size;
    GPU_blend(GPU_BLEND_ALPHA);
    widget_draw_preview(icon, alpha, rect);
    GPU_blend(GPU_BLEND_NONE);

    /* offset rect to draw label in */
    rect->ymin -= text_size;
    rect->ymax -= icon_size;

    /* vertically centering text */
    rect->ymin += UI_UNIT_Y / 2;
  }
  /* Icons on the left with optional text label on the right */
  else if (but->flag & UI_HAS_ICON || show_menu_icon) {
    const bool is_tool = ((but->icon != ICON_NONE) & UI_but_is_tool(but));

    /* XXX add way to draw icons at a different size!
     * Use small icons for popup. */
#ifdef USE_UI_TOOLBAR_HACK
    const float aspect_orig = but->block->aspect;
    if (is_tool && (but->block->flag & UI_BLOCK_POPOVER)) {
      but->block->aspect *= 2.0f;
    }
#endif

    const BIFIconID icon = ui_but_icon(but);
    const int icon_size_init = is_tool ? ICON_DEFAULT_HEIGHT_TOOLBAR : ICON_DEFAULT_HEIGHT;
    const float icon_size = icon_size_init / (but->block->aspect * U.inv_dpi_fac);
    const float icon_padding = 2 * UI_DPI_FAC;

#ifdef USE_UI_TOOLBAR_HACK
    if (is_tool) {
      /* pass (even if its a menu toolbar) */
      but->drawflag |= UI_BUT_TEXT_LEFT;
      but->drawflag |= UI_BUT_ICON_LEFT;
    }
#endif

    /* menu item - add some more padding so menus don't feel cramped. it must
     * be part of the button so that this area is still clickable */
    if (is_tool) {
      /* pass (even if its a menu toolbar) */
    }
    else if (ui_block_is_pie_menu(but->block)) {
      if (but->emboss == UI_EMBOSS_RADIAL) {
        rect->xmin += 0.3f * U.widget_unit;
      }
    }
    /* Menu items, but only if they are not icon-only (rare). */
    else if (ui_block_is_menu(but->block) && but->drawstr[0]) {
      rect->xmin += 0.2f * U.widget_unit;
    }

    /* By default icon is the color of text, but can optionally override with but->col. */
    widget_draw_icon(but, icon, alpha, rect, (but->col[3] != 0) ? but->col : wcol->text);

    if (show_menu_icon) {
      BLI_assert(but->block->content_hints & UI_BLOCK_CONTAINS_SUBMENU_BUT);
      widget_draw_submenu_tria(but, rect, wcol);
    }

#ifdef USE_UI_TOOLBAR_HACK
    but->block->aspect = aspect_orig;
#endif

    rect->xmin += round_fl_to_int(icon_size + icon_padding);
  }

  if (!no_text_padding) {
    const int text_padding = round_fl_to_int((UI_TEXT_MARGIN_X * U.widget_unit) /
                                             but->block->aspect);
    if (but->editstr) {
      rect->xmin += text_padding;
    }
    else if (but->flag & UI_BUT_DRAG_MULTI) {
      const bool text_is_edited = ui_but_drag_multi_edit_get(but) != NULL;
      if (text_is_edited || (but->drawflag & UI_BUT_TEXT_LEFT)) {
        rect->xmin += text_padding;
      }
    }
    else if (but->drawflag & UI_BUT_TEXT_LEFT) {
      rect->xmin += text_padding;
    }
    else if (but->drawflag & UI_BUT_TEXT_RIGHT) {
      rect->xmax -= text_padding;
    }
  }
  else {
    /* In case a separate text label and some other button are placed under each other,
     * and the outline of the button does not contrast with the background.
     * Add an offset (thickness of the outline) so that the text does not stick out visually. */
    if (but->drawflag & UI_BUT_TEXT_LEFT) {
      rect->xmin += U.pixelsize;
    }
    else if (but->drawflag & UI_BUT_TEXT_RIGHT) {
      rect->xmax -= U.pixelsize;
    }
  }

  /* Menu contains sub-menu items with triangle icon on their right. Shortcut
   * strings should be drawn with some padding to the right then. */
  if (ui_block_is_menu(but->block) &&
      (but->block->content_hints & UI_BLOCK_CONTAINS_SUBMENU_BUT)) {
    rect->xmax -= UI_MENU_SUBMENU_PADDING;
  }

  /* extra icons, e.g. 'x' icon to clear text or icon for eyedropper */
  widget_draw_extra_icons(wcol, but, rect, alpha);

  /* clip but->drawstr to fit in available space */
  if (but->editstr && but->pos >= 0) {
    ui_text_clip_cursor(fstyle, but, rect);
  }
  else if (but->drawstr[0] == '\0') {
    /* bypass text clipping on icon buttons */
    but->ofs = 0;
    but->strwidth = 0;
  }
  else if (ELEM(but->type, UI_BTYPE_NUM, UI_BTYPE_NUM_SLIDER)) {
    ui_text_clip_right_label(fstyle, but, rect);
  }
  else if (but->flag & UI_BUT_HAS_SEP_CHAR) {
    /* Clip middle, but protect in all case right part containing the shortcut, if any. */
    ui_text_clip_middle_protect_right(fstyle, but, rect, UI_SEP_CHAR);
  }
  else {
    ui_text_clip_middle(fstyle, but, rect);
  }

  /* Always draw text for text-button cursor. */
  widget_draw_text(fstyle, wcol, but, rect);

  ui_but_text_password_hide(password_str, but, true);

  /* if a widget uses font shadow it has to be deactivated now */
  BLF_disable(fstyle->uifont_id, BLF_SHADOW);
}

#undef UI_TEXT_CLIP_MARGIN

/** \} */

/* -------------------------------------------------------------------- */
/** \name Widget State Management
 *
 * Adjust widget display based on animated, driven, overridden ... etc.
 * \{ */

/* put all widget colors on half alpha, use local storage */
static void ui_widget_color_disabled(uiWidgetType *wt, const int state)
{
  static uiWidgetColors wcol_theme_s;

  wcol_theme_s = *wt->wcol_theme;

  const float factor = widget_alpha_factor(state);

  wcol_theme_s.outline[3] *= factor;
  wcol_theme_s.inner[3] *= factor;
  wcol_theme_s.inner_sel[3] *= factor;
  wcol_theme_s.item[3] *= factor;
  wcol_theme_s.text[3] *= factor;
  wcol_theme_s.text_sel[3] *= factor;

  wt->wcol_theme = &wcol_theme_s;
}

static void widget_active_color(uiWidgetColors *wcol)
{
  const bool dark = (rgb_to_grayscale_byte(wcol->text) > rgb_to_grayscale_byte(wcol->inner));
  color_mul_hsl_v3(wcol->inner, 1.0f, 1.15f, dark ? 1.2f : 1.1f);
  color_mul_hsl_v3(wcol->outline, 1.0f, 1.15f, 1.15f);
  color_mul_hsl_v3(wcol->text, 1.0f, 1.15f, dark ? 1.25f : 0.8f);
}

static const uchar *widget_color_blend_from_flags(const uiWidgetStateColors *wcol_state,
                                                  int state,
                                                  int drawflag,
                                                  const eUIEmbossType emboss)
{
  /* Explicitly require #UI_EMBOSS_NONE_OR_STATUS for color blending with no emboss. */
  if (emboss == UI_EMBOSS_NONE) {
    return NULL;
  }

  if (drawflag & UI_BUT_ANIMATED_CHANGED) {
    return wcol_state->inner_changed_sel;
  }
  if (state & UI_BUT_ANIMATED_KEY) {
    return wcol_state->inner_key_sel;
  }
  if (state & UI_BUT_ANIMATED) {
    return wcol_state->inner_anim_sel;
  }
  if (state & UI_BUT_DRIVEN) {
    return wcol_state->inner_driven_sel;
  }
  if (state & UI_BUT_OVERRIDDEN) {
    return wcol_state->inner_overridden_sel;
  }
  return NULL;
}

/* copy colors from theme, and set changes in it based on state */
static void widget_state(uiWidgetType *wt, int state, int drawflag, eUIEmbossType emboss)
{
  uiWidgetStateColors *wcol_state = wt->wcol_state;

  if ((state & UI_BUT_LIST_ITEM) && !(state & UI_STATE_TEXT_INPUT)) {
    /* Override default widget's colors. */
    bTheme *btheme = UI_GetTheme();
    wt->wcol_theme = &btheme->tui.wcol_list_item;

    if (state & (UI_BUT_DISABLED | UI_BUT_INACTIVE | UI_SEARCH_FILTER_NO_MATCH)) {
      ui_widget_color_disabled(wt, state);
    }
  }

  wt->wcol = *(wt->wcol_theme);

  const uchar *color_blend = widget_color_blend_from_flags(wcol_state, state, drawflag, emboss);

  if (state & UI_SELECT) {
    copy_v4_v4_uchar(wt->wcol.inner, wt->wcol.inner_sel);
    if (color_blend != NULL) {
      color_blend_v3_v3(wt->wcol.inner, color_blend, wcol_state->blend);
    }

    copy_v3_v3_uchar(wt->wcol.text, wt->wcol.text_sel);

    if (state & UI_SELECT) {
      SWAP(short, wt->wcol.shadetop, wt->wcol.shadedown);
    }
  }
  else {
    if (state & UI_BUT_ACTIVE_DEFAULT) {
      copy_v4_v4_uchar(wt->wcol.inner, wt->wcol.inner_sel);
      copy_v4_v4_uchar(wt->wcol.text, wt->wcol.text_sel);
    }
    if (color_blend != NULL) {
      color_blend_v3_v3(wt->wcol.inner, color_blend, wcol_state->blend);
    }

    /* Add "hover" highlight. Ideally this could apply in all cases,
     * even if UI_SELECT. But currently this causes some flickering
     * as buttons can be created and updated without respect to mouse
     * position and so can draw without UI_ACTIVE set.  See D6503. */
    if (state & UI_ACTIVE) {
      widget_active_color(&wt->wcol);
    }
  }

  if (state & UI_BUT_REDALERT) {
    const uchar red[4] = {255, 0, 0};
    if (wt->draw && emboss != UI_EMBOSS_NONE) {
      color_blend_v3_v3(wt->wcol.inner, red, 0.4f);
    }
    else {
      color_blend_v3_v3(wt->wcol.text, red, 0.4f);
    }
  }

  if (state & UI_BUT_DRAG_MULTI) {
    /* the button isn't SELECT but we're editing this so draw with sel color */
    copy_v4_v4_uchar(wt->wcol.inner, wt->wcol.inner_sel);
    SWAP(short, wt->wcol.shadetop, wt->wcol.shadedown);
    color_blend_v3_v3(wt->wcol.text, wt->wcol.text_sel, 0.85f);
  }

  if (state & UI_BUT_NODE_ACTIVE) {
    const uchar blue[4] = {86, 128, 194};
    color_blend_v3_v3(wt->wcol.inner, blue, 0.3f);
  }
}

/** \} */

/* -------------------------------------------------------------------- */
/** \name Widget Types
 * \{ */

/* sliders use special hack which sets 'item' as inner when drawing filling */
static void widget_state_numslider(uiWidgetType *wt, int state, int drawflag, eUIEmbossType emboss)
{
  uiWidgetStateColors *wcol_state = wt->wcol_state;

  /* call this for option button */
  widget_state(wt, state, drawflag, emboss);

  const uchar *color_blend = widget_color_blend_from_flags(wcol_state, state, drawflag, emboss);
  if (color_blend != NULL) {
    /* Set the slider 'item' so that it reflects state settings too.
     * De-saturate so the color of the slider doesn't conflict with the blend color,
     * which can make the color hard to see when the slider is set to full (see T66102). */
    wt->wcol.item[0] = wt->wcol.item[1] = wt->wcol.item[2] = rgb_to_grayscale_byte(wt->wcol.item);
    color_blend_v3_v3(wt->wcol.item, color_blend, wcol_state->blend);
    color_ensure_contrast_v3(wt->wcol.item, wt->wcol.inner, 30);
  }

  if (state & UI_SELECT) {
    SWAP(short, wt->wcol.shadetop, wt->wcol.shadedown);
  }
}

/* labels use theme colors for text */
static void widget_state_option_menu(uiWidgetType *wt,
                                     int state,
                                     int drawflag,
                                     eUIEmbossType emboss)
{
  const bTheme *btheme = UI_GetTheme();

  const uiWidgetColors *old_wcol = wt->wcol_theme;
  uiWidgetColors wcol_menu_option = *wt->wcol_theme;

  /* Override the checkbox theme colors to use the menu-back text colors. */
  copy_v3_v3_uchar(wcol_menu_option.text, btheme->tui.wcol_menu_back.text);
  copy_v3_v3_uchar(wcol_menu_option.text_sel, btheme->tui.wcol_menu_back.text_sel);
  wt->wcol_theme = &wcol_menu_option;

  widget_state(wt, state, drawflag, emboss);

  wt->wcol_theme = old_wcol;
}

static void widget_state_nothing(uiWidgetType *wt,
                                 int UNUSED(state),
                                 int UNUSED(drawflag),
                                 eUIEmbossType UNUSED(emboss))
{
  wt->wcol = *(wt->wcol_theme);
}

/* special case, button that calls pulldown */
static void widget_state_pulldown(uiWidgetType *wt,
                                  int UNUSED(state),
                                  int UNUSED(drawflag),
                                  eUIEmbossType UNUSED(emboss))
{
  wt->wcol = *(wt->wcol_theme);
}

/* special case, pie menu items */
static void widget_state_pie_menu_item(uiWidgetType *wt,
                                       int state,
                                       int UNUSED(drawflag),
                                       eUIEmbossType UNUSED(emboss))
{
  wt->wcol = *(wt->wcol_theme);

  /* active and disabled (not so common) */
  if ((state & UI_BUT_DISABLED) && (state & UI_ACTIVE)) {
    color_blend_v3_v3(wt->wcol.text, wt->wcol.text_sel, 0.5f);
    /* draw the backdrop at low alpha, helps navigating with keys
     * when disabled items are active */
    copy_v4_v4_uchar(wt->wcol.inner, wt->wcol.item);
    wt->wcol.inner[3] = 64;
  }
  else {
    /* regular active */
    if (state & (UI_SELECT | UI_ACTIVE)) {
      copy_v3_v3_uchar(wt->wcol.text, wt->wcol.text_sel);
    }
    else if (state & (UI_BUT_DISABLED | UI_BUT_INACTIVE)) {
      /* regular disabled */
      color_blend_v3_v3(wt->wcol.text, wt->wcol.inner, 0.5f);
    }

    if (state & UI_SELECT) {
      copy_v4_v4_uchar(wt->wcol.inner, wt->wcol.inner_sel);
    }
    else if (state & UI_ACTIVE) {
      copy_v4_v4_uchar(wt->wcol.inner, wt->wcol.item);
    }
  }
}

/* special case, menu items */
static void widget_state_menu_item(uiWidgetType *wt,
                                   int state,
                                   int UNUSED(drawflag),
                                   eUIEmbossType UNUSED(emboss))
{
  wt->wcol = *(wt->wcol_theme);

  /* active and disabled (not so common) */
  if ((state & UI_BUT_DISABLED) && (state & UI_ACTIVE)) {
    /* draw the backdrop at low alpha, helps navigating with keys
     * when disabled items are active */
    wt->wcol.text[3] = 128;
    color_blend_v3_v3(wt->wcol.inner, wt->wcol.text, 0.5f);
    wt->wcol.inner[3] = 64;
  }
  else {
    /* regular active */
    if (state & UI_ACTIVE) {
      copy_v3_v3_uchar(wt->wcol.text, wt->wcol.text_sel);
    }
    else if (state & (UI_BUT_DISABLED | UI_BUT_INACTIVE)) {
      /* regular disabled */
      color_blend_v3_v3(wt->wcol.text, wt->wcol.inner, 0.5f);
    }

    if (state & UI_ACTIVE) {
      copy_v4_v4_uchar(wt->wcol.inner, wt->wcol.inner_sel);
    }
  }
}

/** \} */

/* -------------------------------------------------------------------- */
/** \name Draw Menu Backdrop
 * \{ */

/* outside of rect, rad to left/bottom/right */
static void widget_softshadow(const rcti *rect, int roundboxalign, const float radin)
{
  bTheme *btheme = UI_GetTheme();
  uiWidgetBase wtb;
  rcti rect1 = *rect;
  float triangle_strip[WIDGET_SIZE_MAX * 2 + 2][2];
  const float radout = UI_ThemeMenuShadowWidth();

  /* disabled shadow */
  if (radout == 0.0f) {
    return;
  }

  /* prevent tooltips to not show round shadow */
  if (radout > 0.2f * BLI_rcti_size_y(&rect1)) {
    rect1.ymax -= 0.2f * BLI_rcti_size_y(&rect1);
  }
  else {
    rect1.ymax -= radout;
  }

  /* inner part */
  const int totvert = round_box_shadow_edges(wtb.inner_v,
                                             &rect1,
                                             radin,
                                             roundboxalign &
                                                 (UI_CNR_BOTTOM_RIGHT | UI_CNR_BOTTOM_LEFT),
                                             0.0f);

  /* we draw a number of increasing size alpha quad strips */
  const float alphastep = 3.0f * btheme->tui.menu_shadow_fac / radout;

  const uint pos = GPU_vertformat_attr_add(
      immVertexFormat(), "pos", GPU_COMP_F32, 2, GPU_FETCH_FLOAT);

  immBindBuiltinProgram(GPU_SHADER_2D_UNIFORM_COLOR);

  for (int step = 1; step <= (int)radout; step++) {
    const float expfac = sqrtf(step / radout);

    round_box_shadow_edges(wtb.outer_v, &rect1, radin, UI_CNR_ALL, (float)step);

    immUniformColor4f(0.0f, 0.0f, 0.0f, alphastep * (1.0f - expfac));

    widget_verts_to_triangle_strip(&wtb, totvert, triangle_strip);

    widget_draw_vertex_buffer(pos, 0, GPU_PRIM_TRI_STRIP, triangle_strip, NULL, totvert * 2);
  }

  immUnbindProgram();
}

static void widget_menu_back(uiWidgetColors *wcol, rcti *rect, int flag, int direction)
{
  uiWidgetBase wtb;
  int roundboxalign = UI_CNR_ALL;

  widget_init(&wtb);

  /* menu is 2nd level or deeper */
  if (flag & UI_BLOCK_POPUP) {
    // rect->ymin -= 4.0;
    // rect->ymax += 4.0;
  }
  else if (direction == UI_DIR_DOWN) {
    roundboxalign = (UI_CNR_BOTTOM_RIGHT | UI_CNR_BOTTOM_LEFT);
    rect->ymin -= 0.1f * U.widget_unit;
  }
  else if (direction == UI_DIR_UP) {
    roundboxalign = UI_CNR_TOP_LEFT | UI_CNR_TOP_RIGHT;
    rect->ymax += 0.1f * U.widget_unit;
  }

  GPU_blend(GPU_BLEND_ALPHA);
  widget_softshadow(rect, roundboxalign, wcol->roundness * U.widget_unit);

  round_box_edges(&wtb, roundboxalign, rect, wcol->roundness * U.widget_unit);
  wtb.draw_emboss = false;
  widgetbase_draw(&wtb, wcol);

  GPU_blend(GPU_BLEND_NONE);
}

static void ui_hsv_cursor(float x, float y)
{
  const uint pos = GPU_vertformat_attr_add(
      immVertexFormat(), "pos", GPU_COMP_F32, 2, GPU_FETCH_FLOAT);

  immBindBuiltinProgram(GPU_SHADER_2D_UNIFORM_COLOR);

  immUniformColor3f(1.0f, 1.0f, 1.0f);
  imm_draw_circle_fill_2d(pos, x, y, 3.0f * U.pixelsize, 8);

  GPU_blend(GPU_BLEND_ALPHA);
  GPU_line_smooth(true);
  immUniformColor3f(0.0f, 0.0f, 0.0f);
  imm_draw_circle_wire_2d(pos, x, y, 3.0f * U.pixelsize, 12);
  GPU_blend(GPU_BLEND_NONE);
  GPU_line_smooth(false);

  immUnbindProgram();
}

void ui_hsvcircle_vals_from_pos(
    const rcti *rect, const float mx, const float my, float *r_val_rad, float *r_val_dist)
{
  /* duplication of code... well, simple is better now */
  const float centx = BLI_rcti_cent_x_fl(rect);
  const float centy = BLI_rcti_cent_y_fl(rect);
  const float radius = (float)min_ii(BLI_rcti_size_x(rect), BLI_rcti_size_y(rect)) / 2.0f;
  const float m_delta[2] = {mx - centx, my - centy};
  const float dist_sq = len_squared_v2(m_delta);

  *r_val_dist = (dist_sq < (radius * radius)) ? sqrtf(dist_sq) / radius : 1.0f;
  *r_val_rad = atan2f(m_delta[0], m_delta[1]) / (2.0f * (float)M_PI) + 0.5f;
}

/* cursor in hsv circle, in float units -1 to 1, to map on radius */
void ui_hsvcircle_pos_from_vals(
    const ColorPicker *cpicker, const rcti *rect, const float *hsv, float *r_xpos, float *r_ypos)
{
  /* duplication of code... well, simple is better now */
  const float centx = BLI_rcti_cent_x_fl(rect);
  const float centy = BLI_rcti_cent_y_fl(rect);
  const float radius = (float)min_ii(BLI_rcti_size_x(rect), BLI_rcti_size_y(rect)) / 2.0f;

  const float ang = 2.0f * (float)M_PI * hsv[0] + (float)M_PI_2;

  float radius_t;
  if (cpicker->use_color_cubic && (U.color_picker_type == USER_CP_CIRCLE_HSV)) {
    radius_t = (1.0f - pow3f(1.0f - hsv[1]));
  }
  else {
    radius_t = hsv[1];
  }

  const float rad = clamp_f(radius_t, 0.0f, 1.0f) * radius;
  *r_xpos = centx + cosf(-ang) * rad;
  *r_ypos = centy + sinf(-ang) * rad;
}

static void ui_draw_but_HSVCIRCLE(uiBut *but, const uiWidgetColors *wcol, const rcti *rect)
{
  /* TODO(merwin): reimplement as shader for pixel-perfect colors */

  const int tot = 64;
  const float radstep = 2.0f * (float)M_PI / (float)tot;
  const float centx = BLI_rcti_cent_x_fl(rect);
  const float centy = BLI_rcti_cent_y_fl(rect);
  const float radius = (float)min_ii(BLI_rcti_size_x(rect), BLI_rcti_size_y(rect)) / 2.0f;

  ColorPicker *cpicker = but->custom_data;
  float rgb[3], hsv[3], rgb_center[3];
  const bool is_color_gamma = ui_but_is_color_gamma(but);

  /* Initialize for compatibility. */
  copy_v3_v3(hsv, cpicker->hsv_perceptual);

  /* Compute current hue. */
  ui_but_v3_get(but, rgb);
  ui_scene_linear_to_perceptual_space(but, rgb);
  ui_color_picker_rgb_to_hsv_compat(rgb, hsv);

  CLAMP(hsv[2], 0.0f, 1.0f); /* for display only */

  /* exception: if 'lock' is set
   * lock the value of the color wheel to 1.
   * Useful for color correction tools where you're only interested in hue. */
  if (cpicker->use_color_lock) {
    if (U.color_picker_type == USER_CP_CIRCLE_HSV) {
      hsv[2] = 1.0f;
    }
    else {
      hsv[2] = 0.5f;
    }
  }

  const float hsv_center[3] = {0.0f, 0.0f, hsv[2]};
  ui_color_picker_hsv_to_rgb(hsv_center, rgb_center);
  ui_perceptual_to_scene_linear_space(but, rgb_center);

  if (!is_color_gamma) {
    ui_block_cm_to_display_space_v3(but->block, rgb_center);
  }

  GPUVertFormat *format = immVertexFormat();
  uint pos = GPU_vertformat_attr_add(format, "pos", GPU_COMP_F32, 2, GPU_FETCH_FLOAT);
  const uint color = GPU_vertformat_attr_add(format, "color", GPU_COMP_F32, 3, GPU_FETCH_FLOAT);

  immBindBuiltinProgram(GPU_SHADER_2D_SMOOTH_COLOR);

  immBegin(GPU_PRIM_TRI_FAN, tot + 2);
  immAttr3fv(color, rgb_center);
  immVertex2f(pos, centx, centy);

  float ang = 0.0f;
  for (int a = 0; a <= tot; a++, ang += radstep) {
    const float si = sinf(ang);
    const float co = cosf(ang);
    float hsv_ang[3];
    float rgb_ang[3];

    ui_hsvcircle_vals_from_pos(
        rect, centx + co * radius, centy + si * radius, hsv_ang, hsv_ang + 1);
    hsv_ang[2] = hsv[2];

    ui_color_picker_hsv_to_rgb(hsv_ang, rgb_ang);
    ui_perceptual_to_scene_linear_space(but, rgb_ang);

    if (!is_color_gamma) {
      ui_block_cm_to_display_space_v3(but->block, rgb_ang);
    }

    immAttr3fv(color, rgb_ang);
    immVertex2f(pos, centx + co * radius, centy + si * radius);
  }
  immEnd();
  immUnbindProgram();

  /* fully rounded outline */
  format = immVertexFormat();
  pos = GPU_vertformat_attr_add(format, "pos", GPU_COMP_F32, 2, GPU_FETCH_FLOAT);

  immBindBuiltinProgram(GPU_SHADER_2D_UNIFORM_COLOR);

  GPU_blend(GPU_BLEND_ALPHA);
  GPU_line_smooth(true);

  immUniformColor3ubv(wcol->outline);
  imm_draw_circle_wire_2d(pos, centx, centy, radius, tot);

  immUnbindProgram();

  GPU_blend(GPU_BLEND_NONE);
  GPU_line_smooth(false);

  /* cursor */
  copy_v3_v3(hsv, cpicker->hsv_perceptual);
  ui_but_v3_get(but, rgb);
  ui_scene_linear_to_perceptual_space(but, rgb);
  ui_color_picker_rgb_to_hsv_compat(rgb, hsv);

  float xpos, ypos;
  ui_hsvcircle_pos_from_vals(cpicker, rect, hsv, &xpos, &ypos);
  ui_hsv_cursor(xpos, ypos);
}

/** \} */

/* -------------------------------------------------------------------- */
/** \name Draw Custom Buttons
 * \{ */

/* draws in resolution of 48x4 colors */
void ui_draw_gradient(const rcti *rect,
                      const float hsv[3],
                      const eButGradientType type,
                      const float alpha)
{
  /* allows for 4 steps (red->yellow) */
  const int steps = 48;
  const float color_step = 1.0f / steps;
  int a;
  const float h = hsv[0], s = hsv[1], v = hsv[2];
  float dx, dy, sx1, sx2, sy;
  float col0[4][3]; /* left half, rect bottom to top */
  float col1[4][3]; /* right half, rect bottom to top */

  /* draw series of gouraud rects */

  switch (type) {
    case UI_GRAD_SV:
      hsv_to_rgb(h, 0.0, 0.0, &col1[0][0], &col1[0][1], &col1[0][2]);
      hsv_to_rgb(h, 0.0, 0.333, &col1[1][0], &col1[1][1], &col1[1][2]);
      hsv_to_rgb(h, 0.0, 0.666, &col1[2][0], &col1[2][1], &col1[2][2]);
      hsv_to_rgb(h, 0.0, 1.0, &col1[3][0], &col1[3][1], &col1[3][2]);
      break;
    case UI_GRAD_HV:
      hsv_to_rgb(0.0, s, 0.0, &col1[0][0], &col1[0][1], &col1[0][2]);
      hsv_to_rgb(0.0, s, 0.333, &col1[1][0], &col1[1][1], &col1[1][2]);
      hsv_to_rgb(0.0, s, 0.666, &col1[2][0], &col1[2][1], &col1[2][2]);
      hsv_to_rgb(0.0, s, 1.0, &col1[3][0], &col1[3][1], &col1[3][2]);
      break;
    case UI_GRAD_HS:
      hsv_to_rgb(0.0, 0.0, v, &col1[0][0], &col1[0][1], &col1[0][2]);
      hsv_to_rgb(0.0, 0.333, v, &col1[1][0], &col1[1][1], &col1[1][2]);
      hsv_to_rgb(0.0, 0.666, v, &col1[2][0], &col1[2][1], &col1[2][2]);
      hsv_to_rgb(0.0, 1.0, v, &col1[3][0], &col1[3][1], &col1[3][2]);
      break;
    case UI_GRAD_H:
      hsv_to_rgb(0.0, 1.0, 1.0, &col1[0][0], &col1[0][1], &col1[0][2]);
      copy_v3_v3(col1[1], col1[0]);
      copy_v3_v3(col1[2], col1[0]);
      copy_v3_v3(col1[3], col1[0]);
      break;
    case UI_GRAD_S:
      hsv_to_rgb(1.0, 0.0, 1.0, &col1[1][0], &col1[1][1], &col1[1][2]);
      copy_v3_v3(col1[0], col1[1]);
      copy_v3_v3(col1[2], col1[1]);
      copy_v3_v3(col1[3], col1[1]);
      break;
    case UI_GRAD_V:
      hsv_to_rgb(1.0, 1.0, 0.0, &col1[2][0], &col1[2][1], &col1[2][2]);
      copy_v3_v3(col1[0], col1[2]);
      copy_v3_v3(col1[1], col1[2]);
      copy_v3_v3(col1[3], col1[2]);
      break;
    default:
      BLI_assert_msg(0, "invalid 'type' argument");
      hsv_to_rgb(1.0, 1.0, 1.0, &col1[2][0], &col1[2][1], &col1[2][2]);
      copy_v3_v3(col1[0], col1[2]);
      copy_v3_v3(col1[1], col1[2]);
      copy_v3_v3(col1[3], col1[2]);
      break;
  }

  /* old below */
  GPUVertFormat *format = immVertexFormat();
  const uint pos = GPU_vertformat_attr_add(format, "pos", GPU_COMP_F32, 2, GPU_FETCH_FLOAT);
  const uint col = GPU_vertformat_attr_add(format, "color", GPU_COMP_F32, 4, GPU_FETCH_FLOAT);
  immBindBuiltinProgram(GPU_SHADER_2D_SMOOTH_COLOR);

  immBegin(GPU_PRIM_TRIS, steps * 3 * 6);

  /* 0.999 = prevent float inaccuracy for steps */
  for (dx = 0.0f; dx < 0.999f; dx += color_step) {
    const float dx_next = dx + color_step;

    /* previous color */
    copy_v3_v3(col0[0], col1[0]);
    copy_v3_v3(col0[1], col1[1]);
    copy_v3_v3(col0[2], col1[2]);
    copy_v3_v3(col0[3], col1[3]);

    /* new color */
    switch (type) {
      case UI_GRAD_SV:
        hsv_to_rgb(h, dx, 0.0, &col1[0][0], &col1[0][1], &col1[0][2]);
        hsv_to_rgb(h, dx, 0.333, &col1[1][0], &col1[1][1], &col1[1][2]);
        hsv_to_rgb(h, dx, 0.666, &col1[2][0], &col1[2][1], &col1[2][2]);
        hsv_to_rgb(h, dx, 1.0, &col1[3][0], &col1[3][1], &col1[3][2]);
        break;
      case UI_GRAD_HV:
        hsv_to_rgb(dx_next, s, 0.0, &col1[0][0], &col1[0][1], &col1[0][2]);
        hsv_to_rgb(dx_next, s, 0.333, &col1[1][0], &col1[1][1], &col1[1][2]);
        hsv_to_rgb(dx_next, s, 0.666, &col1[2][0], &col1[2][1], &col1[2][2]);
        hsv_to_rgb(dx_next, s, 1.0, &col1[3][0], &col1[3][1], &col1[3][2]);
        break;
      case UI_GRAD_HS:
        hsv_to_rgb(dx_next, 0.0, v, &col1[0][0], &col1[0][1], &col1[0][2]);
        hsv_to_rgb(dx_next, 0.333, v, &col1[1][0], &col1[1][1], &col1[1][2]);
        hsv_to_rgb(dx_next, 0.666, v, &col1[2][0], &col1[2][1], &col1[2][2]);
        hsv_to_rgb(dx_next, 1.0, v, &col1[3][0], &col1[3][1], &col1[3][2]);
        break;
      case UI_GRAD_H:
        /* annoying but without this the color shifts - could be solved some other way
         * - campbell */
        hsv_to_rgb(dx_next, 1.0, 1.0, &col1[0][0], &col1[0][1], &col1[0][2]);
        copy_v3_v3(col1[1], col1[0]);
        copy_v3_v3(col1[2], col1[0]);
        copy_v3_v3(col1[3], col1[0]);
        break;
      case UI_GRAD_S:
        hsv_to_rgb(h, dx, 1.0, &col1[1][0], &col1[1][1], &col1[1][2]);
        copy_v3_v3(col1[0], col1[1]);
        copy_v3_v3(col1[2], col1[1]);
        copy_v3_v3(col1[3], col1[1]);
        break;
      case UI_GRAD_V:
        hsv_to_rgb(h, 1.0, dx, &col1[2][0], &col1[2][1], &col1[2][2]);
        copy_v3_v3(col1[0], col1[2]);
        copy_v3_v3(col1[1], col1[2]);
        copy_v3_v3(col1[3], col1[2]);
        break;
      default:
        break;
    }

    /* rect */
    sx1 = rect->xmin + dx * BLI_rcti_size_x(rect);
    sx2 = rect->xmin + dx_next * BLI_rcti_size_x(rect);
    sy = rect->ymin;
    dy = (float)BLI_rcti_size_y(rect) / 3.0f;

    for (a = 0; a < 3; a++, sy += dy) {
      immAttr4f(col, col0[a][0], col0[a][1], col0[a][2], alpha);
      immVertex2f(pos, sx1, sy);

      immAttr4f(col, col1[a][0], col1[a][1], col1[a][2], alpha);
      immVertex2f(pos, sx2, sy);

      immAttr4f(col, col1[a + 1][0], col1[a + 1][1], col1[a + 1][2], alpha);
      immVertex2f(pos, sx2, sy + dy);

      immAttr4f(col, col0[a][0], col0[a][1], col0[a][2], alpha);
      immVertex2f(pos, sx1, sy);

      immAttr4f(col, col1[a + 1][0], col1[a + 1][1], col1[a + 1][2], alpha);
      immVertex2f(pos, sx2, sy + dy);

      immAttr4f(col, col0[a + 1][0], col0[a + 1][1], col0[a + 1][2], alpha);
      immVertex2f(pos, sx1, sy + dy);
    }
  }
  immEnd();

  immUnbindProgram();
}

void ui_hsvcube_pos_from_vals(
    const uiButHSVCube *hsv_but, const rcti *rect, const float *hsv, float *r_xp, float *r_yp)
{
  float x = 0.0f, y = 0.0f;

  switch (hsv_but->gradient_type) {
    case UI_GRAD_SV:
      x = hsv[1];
      y = hsv[2];
      break;
    case UI_GRAD_HV:
      x = hsv[0];
      y = hsv[2];
      break;
    case UI_GRAD_HS:
      x = hsv[0];
      y = hsv[1];
      break;
    case UI_GRAD_H:
      x = hsv[0];
      y = 0.5;
      break;
    case UI_GRAD_S:
      x = hsv[1];
      y = 0.5;
      break;
    case UI_GRAD_V:
      x = hsv[2];
      y = 0.5;
      break;
    case UI_GRAD_L_ALT:
      x = 0.5f;
      /* exception only for value strip - use the range set in but->min/max */
      y = hsv[2];
      break;
    case UI_GRAD_V_ALT:
      x = 0.5f;
      /* exception only for value strip - use the range set in but->min/max */
      y = (hsv[2] - hsv_but->but.softmin) / (hsv_but->but.softmax - hsv_but->but.softmin);
      break;
  }

  /* cursor */
  *r_xp = rect->xmin + x * BLI_rcti_size_x(rect);
  *r_yp = rect->ymin + y * BLI_rcti_size_y(rect);
}

static void ui_draw_but_HSVCUBE(uiBut *but, const rcti *rect)
{
  const uiButHSVCube *hsv_but = (uiButHSVCube *)but;
  float rgb[3];
  float x = 0.0f, y = 0.0f;
  ColorPicker *cpicker = but->custom_data;
  float *hsv = cpicker->hsv_perceptual;
  float hsv_n[3];

  /* Initialize for compatibility. */
  copy_v3_v3(hsv_n, hsv);

  ui_but_v3_get(but, rgb);
  ui_scene_linear_to_perceptual_space(but, rgb);
  rgb_to_hsv_compat_v(rgb, hsv_n);

  ui_draw_gradient(rect, hsv_n, hsv_but->gradient_type, 1.0f);

  ui_hsvcube_pos_from_vals(hsv_but, rect, hsv_n, &x, &y);
  CLAMP(x, rect->xmin + 3.0f, rect->xmax - 3.0f);
  CLAMP(y, rect->ymin + 3.0f, rect->ymax - 3.0f);

  ui_hsv_cursor(x, y);

  /* outline */
  const uint pos = GPU_vertformat_attr_add(
      immVertexFormat(), "pos", GPU_COMP_F32, 2, GPU_FETCH_FLOAT);
  immBindBuiltinProgram(GPU_SHADER_2D_UNIFORM_COLOR);
  immUniformColor3ub(0, 0, 0);
  imm_draw_box_wire_2d(pos, (rect->xmin), (rect->ymin), (rect->xmax), (rect->ymax));
  immUnbindProgram();
}

/* vertical 'value' slider, using new widget code */
static void ui_draw_but_HSV_v(uiBut *but, const rcti *rect)
{
  const uiButHSVCube *hsv_but = (uiButHSVCube *)but;
  bTheme *btheme = UI_GetTheme();
  uiWidgetColors *wcol = &btheme->tui.wcol_numslider;
  uiWidgetBase wtb;
  const float rad = wcol->roundness * BLI_rcti_size_x(rect);
  float x, y;
  float rgb[3], hsv[3], v;

  ui_but_v3_get(but, rgb);
  ui_scene_linear_to_perceptual_space(but, rgb);

  if (hsv_but->gradient_type == UI_GRAD_L_ALT) {
    rgb_to_hsl_v(rgb, hsv);
  }
  else {
    rgb_to_hsv_v(rgb, hsv);
  }
  v = hsv[2];

  /* map v from property range to [0,1] */
  if (hsv_but->gradient_type == UI_GRAD_V_ALT) {
    const float min = but->softmin, max = but->softmax;
    v = (v - min) / (max - min);
  }

  widget_init(&wtb);

  /* fully rounded */
  round_box_edges(&wtb, UI_CNR_ALL, rect, rad);

  /* setup temp colors */
  widgetbase_draw(&wtb,
                  &((uiWidgetColors){
                      .outline = {0, 0, 0, 255},
                      .inner = {128, 128, 128, 255},
                      .shadetop = 127,
                      .shadedown = -128,
                      .shaded = 1,
                  }));

  /* We are drawing on top of widget bases. Flush cache. */
  GPU_blend(GPU_BLEND_ALPHA);
  UI_widgetbase_draw_cache_flush();
  GPU_blend(GPU_BLEND_NONE);

  /* cursor */
  x = rect->xmin + 0.5f * BLI_rcti_size_x(rect);
  y = rect->ymin + v * BLI_rcti_size_y(rect);
  CLAMP(y, rect->ymin + 3.0f, rect->ymax - 3.0f);

  ui_hsv_cursor(x, y);
}

/** Separator for menus. */
static void ui_draw_separator(const rcti *rect, const uiWidgetColors *wcol)
{
  const int y = rect->ymin + BLI_rcti_size_y(rect) / 2 - 1;
  const uchar col[4] = {
      wcol->text[0],
      wcol->text[1],
      wcol->text[2],
      30,
  };

  const uint pos = GPU_vertformat_attr_add(
      immVertexFormat(), "pos", GPU_COMP_F32, 2, GPU_FETCH_FLOAT);
  immBindBuiltinProgram(GPU_SHADER_2D_UNIFORM_COLOR);

  GPU_blend(GPU_BLEND_ALPHA);
  immUniformColor4ubv(col);
  GPU_line_width(1.0f);

  immBegin(GPU_PRIM_LINES, 2);
  immVertex2f(pos, rect->xmin, y);
  immVertex2f(pos, rect->xmax, y);
  immEnd();

  GPU_blend(GPU_BLEND_NONE);

  immUnbindProgram();
}

/** \} */

/* -------------------------------------------------------------------- */
/** \name Button Draw Callbacks
 * \{ */

static void widget_numbut_draw(
    uiWidgetColors *wcol, rcti *rect, int state, int roundboxalign, bool emboss)
{
  const float rad = wcol->roundness * BLI_rcti_size_y(rect);
  const int handle_width = min_ii(BLI_rcti_size_x(rect) / 3, BLI_rcti_size_y(rect) * 0.7f);

  if (state & UI_SELECT) {
    SWAP(short, wcol->shadetop, wcol->shadedown);
  }

  uiWidgetBase wtb;
  widget_init(&wtb);

  if (!emboss) {
    round_box_edges(&wtb, roundboxalign, rect, rad);
  }
  else {
    wtb.draw_inner = false;
    wtb.draw_outline = false;
  }

  /* decoration */
  if ((state & UI_ACTIVE) && !(state & UI_STATE_TEXT_INPUT)) {
    uiWidgetColors wcol_zone;
    uiWidgetBase wtb_zone;
    rcti rect_zone;
    int roundboxalign_zone;

    /* left arrow zone */
    widget_init(&wtb_zone);
    wtb_zone.draw_outline = false;
    wtb_zone.draw_emboss = false;

    wcol_zone = *wcol;
    copy_v3_v3_uchar(wcol_zone.item, wcol->text);
    if (state & UI_STATE_ACTIVE_LEFT) {
      widget_active_color(&wcol_zone);
    }

    rect_zone = *rect;
    rect_zone.xmax = rect->xmin + handle_width + U.pixelsize;
    roundboxalign_zone = roundboxalign & ~(UI_CNR_TOP_RIGHT | UI_CNR_BOTTOM_RIGHT);
    round_box_edges(&wtb_zone, roundboxalign_zone, &rect_zone, rad);

    shape_preset_init_number_arrows(&wtb_zone.tria1, &rect_zone, 0.6f, 'l');
    widgetbase_draw(&wtb_zone, &wcol_zone);

    /* right arrow zone */
    widget_init(&wtb_zone);
    wtb_zone.draw_outline = false;
    wtb_zone.draw_emboss = false;
    wtb_zone.tria1.type = ROUNDBOX_TRIA_ARROWS;

    wcol_zone = *wcol;
    copy_v3_v3_uchar(wcol_zone.item, wcol->text);
    if (state & UI_STATE_ACTIVE_RIGHT) {
      widget_active_color(&wcol_zone);
    }

    rect_zone = *rect;
    rect_zone.xmin = rect->xmax - handle_width - U.pixelsize;
    roundboxalign_zone = roundboxalign & ~(UI_CNR_TOP_LEFT | UI_CNR_BOTTOM_LEFT);
    round_box_edges(&wtb_zone, roundboxalign_zone, &rect_zone, rad);

    shape_preset_init_number_arrows(&wtb_zone.tria2, &rect_zone, 0.6f, 'r');
    widgetbase_draw(&wtb_zone, &wcol_zone);

    /* middle highlight zone */
    widget_init(&wtb_zone);
    wtb_zone.draw_outline = false;
    wtb_zone.draw_emboss = false;

    wcol_zone = *wcol;
    copy_v3_v3_uchar(wcol_zone.item, wcol->text);
    if (!(state & (UI_STATE_ACTIVE_LEFT | UI_STATE_ACTIVE_RIGHT))) {
      widget_active_color(&wcol_zone);
    }

    rect_zone = *rect;
    rect_zone.xmin = rect->xmin + handle_width - U.pixelsize;
    rect_zone.xmax = rect->xmax - handle_width + U.pixelsize;
    round_box_edges(&wtb_zone, 0, &rect_zone, 0);
    widgetbase_draw(&wtb_zone, &wcol_zone);

    /* outline */
    wtb.draw_inner = false;
    widgetbase_draw(&wtb, wcol);
  }
  else {
    /* inner and outline */
    widgetbase_draw(&wtb, wcol);
  }

  if (!(state & UI_STATE_TEXT_INPUT)) {
    const float textofs = 0.425f * BLI_rcti_size_y(rect);

    /* text space */
    rect->xmin += textofs;
    rect->xmax -= textofs;
  }
}

static void widget_numbut(uiWidgetColors *wcol, rcti *rect, int state, int roundboxalign)
{
  widget_numbut_draw(wcol, rect, state, roundboxalign, false);
}

static void widget_menubut(uiWidgetColors *wcol, rcti *rect, int UNUSED(state), int roundboxalign)
{
  uiWidgetBase wtb;
  widget_init(&wtb);

  const float rad = wcol->roundness * U.widget_unit;
  round_box_edges(&wtb, roundboxalign, rect, rad);

  /* decoration */
  shape_preset_trias_from_rect_menu(&wtb.tria1, rect);
  /* copy size and center to 2nd tria */
  wtb.tria2 = wtb.tria1;

  widgetbase_draw(&wtb, wcol);

  /* text space, arrows are about 0.6 height of button */
  rect->xmax -= (6 * BLI_rcti_size_y(rect)) / 10;
}

/**
 * Draw menu buttons still with triangles when field is not embossed
 */
static void widget_menubut_embossn(const uiBut *UNUSED(but),
                                   uiWidgetColors *wcol,
                                   rcti *rect,
                                   int UNUSED(state),
                                   int UNUSED(roundboxalign))
{
  uiWidgetBase wtb;
  widget_init(&wtb);
  wtb.draw_inner = false;
  wtb.draw_outline = false;

  /* decoration */
  shape_preset_trias_from_rect_menu(&wtb.tria1, rect);
  /* copy size and center to 2nd tria */
  wtb.tria2 = wtb.tria1;

  widgetbase_draw(&wtb, wcol);
}

/**
 * Draw number buttons still with triangles when field is not embossed
 */
static void widget_numbut_embossn(
    const uiBut *UNUSED(but), uiWidgetColors *wcol, rcti *rect, int state, int roundboxalign)
{
  widget_numbut_draw(wcol, rect, state, roundboxalign, true);
}

/* function in use for buttons and for view2d sliders */
void UI_draw_widget_scroll(uiWidgetColors *wcol, const rcti *rect, const rcti *slider, int state)
{
  uiWidgetBase wtb;
  bool outline = false;

  widget_init(&wtb);

  /* determine horizontal/vertical */
  const bool horizontal = (BLI_rcti_size_x(rect) > BLI_rcti_size_y(rect));

  const float rad = (horizontal) ? wcol->roundness * BLI_rcti_size_y(rect) :
                                   wcol->roundness * BLI_rcti_size_x(rect);

  wtb.uniform_params.shade_dir = (horizontal) ? 1.0f : 0.0;

  /* draw back part, colors swapped and shading inverted */
  if (horizontal) {
    SWAP(short, wcol->shadetop, wcol->shadedown);
  }

  round_box_edges(&wtb, UI_CNR_ALL, rect, rad);
  widgetbase_draw(&wtb, wcol);

  /* slider */
  if ((BLI_rcti_size_x(slider) < 2) || (BLI_rcti_size_y(slider) < 2)) {
    /* pass */
  }
  else {
    SWAP(short, wcol->shadetop, wcol->shadedown);

    copy_v4_v4_uchar(wcol->inner, wcol->item);

    if (wcol->shadetop > wcol->shadedown) {
      wcol->shadetop += 20; /* XXX violates themes... */
    }
    else {
      wcol->shadedown += 20;
    }

    if (state & UI_SCROLL_PRESSED) {
      wcol->inner[0] = wcol->inner[0] >= 250 ? 255 : wcol->inner[0] + 5;
      wcol->inner[1] = wcol->inner[1] >= 250 ? 255 : wcol->inner[1] + 5;
      wcol->inner[2] = wcol->inner[2] >= 250 ? 255 : wcol->inner[2] + 5;
    }

    /* draw */
    wtb.draw_emboss = false; /* only emboss once */

    /* exception for progress bar */
    if (state & UI_SCROLL_NO_OUTLINE) {
      SWAP(bool, outline, wtb.draw_outline);
    }

    round_box_edges(&wtb, UI_CNR_ALL, slider, rad);

    if (state & UI_SCROLL_ARROWS) {
      if (wcol->item[0] > 48) {
        wcol->item[0] -= 48;
      }
      if (wcol->item[1] > 48) {
        wcol->item[1] -= 48;
      }
      if (wcol->item[2] > 48) {
        wcol->item[2] -= 48;
      }
      wcol->item[3] = 255;

      if (horizontal) {
        rcti slider_inset = *slider;
        slider_inset.xmin += 0.05 * U.widget_unit;
        slider_inset.xmax -= 0.05 * U.widget_unit;
        shape_preset_init_scroll_circle(&wtb.tria1, &slider_inset, 0.6f, 'l');
        shape_preset_init_scroll_circle(&wtb.tria2, &slider_inset, 0.6f, 'r');
      }
      else {
        shape_preset_init_scroll_circle(&wtb.tria1, slider, 0.6f, 'b');
        shape_preset_init_scroll_circle(&wtb.tria2, slider, 0.6f, 't');
      }
    }
    widgetbase_draw(&wtb, wcol);

    if (state & UI_SCROLL_NO_OUTLINE) {
      SWAP(bool, outline, wtb.draw_outline);
    }
  }
}

static void widget_scroll(
    uiBut *but, uiWidgetColors *wcol, rcti *rect, int state, int UNUSED(roundboxalign))
{
  /* calculate slider part */
  const float value = (float)ui_but_value_get(but);

  const float size = max_ff((but->softmax + but->a1 - but->softmin), 2.0f);

  /* position */
  rcti rect1 = *rect;

  /* determine horizontal/vertical */
  const bool horizontal = (BLI_rcti_size_x(rect) > BLI_rcti_size_y(rect));

  if (horizontal) {
    const float fac = BLI_rcti_size_x(rect) / size;
    rect1.xmin = rect1.xmin + ceilf(fac * (value - but->softmin));
    rect1.xmax = rect1.xmin + ceilf(fac * (but->a1 - but->softmin));

    /* Ensure minimum size. */
    const float min = BLI_rcti_size_y(rect);

    if (BLI_rcti_size_x(&rect1) < min) {
      rect1.xmax = rect1.xmin + min;

      if (rect1.xmax > rect->xmax) {
        rect1.xmax = rect->xmax;
        rect1.xmin = max_ii(rect1.xmax - min, rect->xmin);
      }
    }
  }
  else {
    const float fac = BLI_rcti_size_y(rect) / size;
    rect1.ymax = rect1.ymax - ceilf(fac * (value - but->softmin));
    rect1.ymin = rect1.ymax - ceilf(fac * (but->a1 - but->softmin));

    /* Ensure minimum size. */
    const float min = BLI_rcti_size_x(rect);

    if (BLI_rcti_size_y(&rect1) < min) {
      rect1.ymax = rect1.ymin + min;

      if (rect1.ymax > rect->ymax) {
        rect1.ymax = rect->ymax;
        rect1.ymin = max_ii(rect1.ymax - min, rect->ymin);
      }
    }
  }

  if (state & UI_SELECT) {
    state = UI_SCROLL_PRESSED;
  }
  else {
    state = 0;
  }
  UI_draw_widget_scroll(wcol, rect, &rect1, state);
}

static void widget_progressbar(
    uiBut *but, uiWidgetColors *wcol, rcti *rect, int UNUSED(state), int roundboxalign)
{
  uiButProgressbar *but_progressbar = (uiButProgressbar *)but;
  rcti rect_prog = *rect, rect_bar = *rect;

  uiWidgetBase wtb, wtb_bar;
  widget_init(&wtb);
  widget_init(&wtb_bar);

  /* round corners */
  const float value = but_progressbar->progress;
  const float ofs = wcol->roundness * BLI_rcti_size_y(&rect_prog);
  float w = value * BLI_rcti_size_x(&rect_prog);

  /* Ensure minimum size. */
  w = MAX2(w, ofs);

  rect_bar.xmax = rect_bar.xmin + w;

  round_box_edges(&wtb, roundboxalign, &rect_prog, ofs);
  round_box_edges(&wtb_bar, roundboxalign, &rect_bar, ofs);

  wtb.draw_outline = true;
  widgetbase_draw(&wtb, wcol);

  /* "slider" bar color */
  copy_v3_v3_uchar(wcol->inner, wcol->item);
  widgetbase_draw(&wtb_bar, wcol);
}

static void widget_datasetrow(
    uiBut *but, uiWidgetColors *wcol, rcti *rect, int state, int UNUSED(roundboxalign))
{
  uiButDatasetRow *but_componentrow = (uiButDatasetRow *)but;
  uiWidgetBase wtb;
  widget_init(&wtb);

  /* no outline */
  wtb.draw_outline = false;
  const float rad = wcol->roundness * U.widget_unit;
  round_box_edges(&wtb, UI_CNR_ALL, rect, rad);

  if ((state & UI_ACTIVE) || (state & UI_SELECT)) {
    widgetbase_draw(&wtb, wcol);
  }

  BLI_rcti_resize(rect,
                  BLI_rcti_size_x(rect) - UI_UNIT_X * but_componentrow->indentation,
                  BLI_rcti_size_y(rect));
  BLI_rcti_translate(rect, 0.5f * UI_UNIT_X * but_componentrow->indentation, 0);
}

static void widget_nodesocket(
    uiBut *but, uiWidgetColors *wcol, rcti *rect, int UNUSED(state), int UNUSED(roundboxalign))
{
  const int radi = 5;

  uiWidgetBase wtb;
  widget_init(&wtb);

  uchar old_inner[3], old_outline[3];
  copy_v3_v3_uchar(old_inner, wcol->inner);
  copy_v3_v3_uchar(old_outline, wcol->outline);

  wcol->inner[0] = but->col[0];
  wcol->inner[1] = but->col[1];
  wcol->inner[2] = but->col[2];
  wcol->outline[0] = 0;
  wcol->outline[1] = 0;
  wcol->outline[2] = 0;
  wcol->outline[3] = 150;

  const int cent_x = BLI_rcti_cent_x(rect);
  const int cent_y = BLI_rcti_cent_y(rect);
  rect->xmin = cent_x - radi;
  rect->xmax = cent_x + radi;
  rect->ymin = cent_y - radi;
  rect->ymax = cent_y + radi;

  wtb.draw_outline = true;
  round_box_edges(&wtb, UI_CNR_ALL, rect, (float)radi);
  widgetbase_draw(&wtb, wcol);

  copy_v3_v3_uchar(wcol->inner, old_inner);
  copy_v3_v3_uchar(wcol->outline, old_outline);
}

static void widget_numslider(
    uiBut *but, uiWidgetColors *wcol, rcti *rect, int state, int roundboxalign)
{
  uiWidgetBase wtb, wtb1;
  widget_init(&wtb);
  widget_init(&wtb1);

  /* Backdrop first. */
  const float ofs = wcol->roundness * BLI_rcti_size_y(rect);
  const float toffs = ofs * 0.75f;
  round_box_edges(&wtb, roundboxalign, rect, ofs);

  wtb.draw_outline = false;
  widgetbase_draw(&wtb, wcol);

  /* Draw slider part only when not in text editing. */
  if (!(state & UI_STATE_TEXT_INPUT)) {
    int roundboxalign_slider = roundboxalign;

    uchar outline[3];
    copy_v3_v3_uchar(outline, wcol->outline);
    copy_v3_v3_uchar(wcol->outline, wcol->item);
    copy_v3_v3_uchar(wcol->inner, wcol->item);

    if (!(state & UI_SELECT)) {
      SWAP(short, wcol->shadetop, wcol->shadedown);
    }

    rcti rect1 = *rect;
    float factor, factor_ui;
    float factor_discard = 1.0f; /* No discard. */
    const float value = (float)ui_but_value_get(but);
    const float softmin = but->softmin;
    const float softmax = but->softmax;
    const float softrange = softmax - softmin;
    const PropertyScaleType scale_type = ui_but_scale_type(but);

    switch (scale_type) {
      case PROP_SCALE_LINEAR: {
        if (but->rnaprop && (RNA_property_subtype(but->rnaprop) == PROP_PERCENTAGE)) {
          factor = value / softmax;
        }
        else {
          factor = (value - softmin) / softrange;
        }
        break;
      }
      case PROP_SCALE_LOG: {
        const float logmin = fmaxf(softmin, 0.5e-8f);
        const float base = softmax / logmin;
        factor = logf(value / logmin) / logf(base);
        break;
      }
      case PROP_SCALE_CUBIC: {
        const float cubicmin = cube_f(softmin);
        const float cubicmax = cube_f(softmax);
        const float cubicrange = cubicmax - cubicmin;
        const float f = (value - softmin) * cubicrange / softrange + cubicmin;
        factor = (cbrtf(f) - softmin) / softrange;
        break;
      }
    }

    const float width = (float)BLI_rcti_size_x(rect);
    factor_ui = factor * width;

    if (factor_ui <= ofs) {
      /* Left part only. */
      roundboxalign_slider &= ~(UI_CNR_TOP_RIGHT | UI_CNR_BOTTOM_RIGHT);
      rect1.xmax = rect1.xmin + ofs;
      factor_discard = factor_ui / ofs;
    }
    else if (factor_ui <= width - ofs) {
      /* Left part + middle part. */
      roundboxalign_slider &= ~(UI_CNR_TOP_RIGHT | UI_CNR_BOTTOM_RIGHT);
      rect1.xmax = rect1.xmin + factor_ui;
    }
    else {
      /* Left part + middle part + right part. */
      factor_discard = factor;
    }

    round_box_edges(&wtb1, roundboxalign_slider, &rect1, ofs);
    wtb1.draw_outline = false;
    widgetbase_set_uniform_discard_factor(&wtb1, factor_discard);
    widgetbase_draw(&wtb1, wcol);

    copy_v3_v3_uchar(wcol->outline, outline);

    if (!(state & UI_SELECT)) {
      SWAP(short, wcol->shadetop, wcol->shadedown);
    }
  }

  /* Outline. */
  wtb.draw_outline = true;
  wtb.draw_inner = false;
  widgetbase_draw(&wtb, wcol);

  /* Add space at either side of the button so text aligns with number-buttons
   * (which have arrow icons). */
  if (!(state & UI_STATE_TEXT_INPUT)) {
    rect->xmax -= toffs;
    rect->xmin += toffs;
  }
}

/* I think 3 is sufficient border to indicate keyed status */
#define SWATCH_KEYED_BORDER 3

static void widget_swatch(
    uiBut *but, uiWidgetColors *wcol, rcti *rect, int state, int roundboxalign)
{
  BLI_assert(but->type == UI_BTYPE_COLOR);
  uiButColor *color_but = (uiButColor *)but;
  float col[4];

  col[3] = 1.0f;

  if (but->rnaprop) {
    BLI_assert(but->rnaindex == -1);

    if (RNA_property_array_length(&but->rnapoin, but->rnaprop) == 4) {
      col[3] = RNA_property_float_get_index(&but->rnapoin, but->rnaprop, 3);
    }
  }

  uiWidgetBase wtb;
  widget_init(&wtb);

  const float rad = wcol->roundness * U.widget_unit;
  round_box_edges(&wtb, roundboxalign, rect, rad);

  ui_but_v3_get(but, col);

  if ((state & (UI_BUT_ANIMATED | UI_BUT_ANIMATED_KEY | UI_BUT_DRIVEN | UI_BUT_OVERRIDDEN |
                UI_BUT_REDALERT)) ||
      (but->drawflag & UI_BUT_ANIMATED_CHANGED)) {
    /* draw based on state - color for keyed etc */
    widgetbase_draw(&wtb, wcol);

    /* inset to draw swatch color */
    rect->xmin += SWATCH_KEYED_BORDER;
    rect->xmax -= SWATCH_KEYED_BORDER;
    rect->ymin += SWATCH_KEYED_BORDER;
    rect->ymax -= SWATCH_KEYED_BORDER;

    round_box_edges(&wtb, roundboxalign, rect, rad);
  }

  if (!ui_but_is_color_gamma(but)) {
    ui_block_cm_to_display_space_v3(but->block, col);
  }

  rgba_float_to_uchar(wcol->inner, col);
  const bool show_alpha_checkers = (wcol->inner[3] < 255);

  wcol->shaded = 0;

  /* Now we reduce alpha of the inner color (i.e. the color shown)
   * so that this setting can look grayed out, while retaining
   * the checkerboard (for transparent values). This is needed
   * here as the effects of ui_widget_color_disabled() are overwritten. */
  wcol->inner[3] *= widget_alpha_factor(state);

  widgetbase_draw_ex(&wtb, wcol, show_alpha_checkers);
  if (color_but->is_pallete_color &&
      ((Palette *)but->rnapoin.owner_id)->active_color == color_but->palette_color_index) {
    const float width = rect->xmax - rect->xmin;
    const float height = rect->ymax - rect->ymin;
    /* find color luminance and change it slightly */
    float bw = rgb_to_grayscale(col);

    bw += (bw < 0.5f) ? 0.5f : -0.5f;

    /* We are drawing on top of widget bases. Flush cache. */
    GPU_blend(GPU_BLEND_ALPHA);
    UI_widgetbase_draw_cache_flush();
    GPU_blend(GPU_BLEND_NONE);

    const uint pos = GPU_vertformat_attr_add(
        immVertexFormat(), "pos", GPU_COMP_F32, 2, GPU_FETCH_FLOAT);
    immBindBuiltinProgram(GPU_SHADER_2D_UNIFORM_COLOR);

    immUniformColor3f(bw, bw, bw);
    immBegin(GPU_PRIM_TRIS, 3);
    immVertex2f(pos, rect->xmin + 0.1f * width, rect->ymin + 0.9f * height);
    immVertex2f(pos, rect->xmin + 0.1f * width, rect->ymin + 0.5f * height);
    immVertex2f(pos, rect->xmin + 0.5f * width, rect->ymin + 0.9f * height);
    immEnd();

    immUnbindProgram();
  }
}

static void widget_unitvec(
    uiBut *but, uiWidgetColors *wcol, rcti *rect, int UNUSED(state), int UNUSED(roundboxalign))
{
  ui_draw_but_UNITVEC(but, wcol, rect);
}

static void widget_icon_has_anim(
    uiBut *but, uiWidgetColors *wcol, rcti *rect, int state, int roundboxalign)
{
  if (state & (UI_BUT_ANIMATED | UI_BUT_ANIMATED_KEY | UI_BUT_DRIVEN | UI_BUT_REDALERT) &&
      but->emboss != UI_EMBOSS_NONE) {
    uiWidgetBase wtb;
    widget_init(&wtb);
    wtb.draw_outline = false;

    const float rad = wcol->roundness * BLI_rcti_size_y(rect);
    round_box_edges(&wtb, UI_CNR_ALL, rect, rad);
    widgetbase_draw(&wtb, wcol);
  }
  else if (but->type == UI_BTYPE_NUM) {
    /* Draw number buttons still with left/right
     * triangles when field is not embossed */
    widget_numbut_embossn(but, wcol, rect, state, roundboxalign);
  }
  else if (but->type == UI_BTYPE_MENU) {
    /* Draw menu buttons still with down arrow. */
    widget_menubut_embossn(but, wcol, rect, state, roundboxalign);
  }
}

static void widget_textbut(uiWidgetColors *wcol, rcti *rect, int state, int roundboxalign)
{
  if (state & UI_SELECT) {
    SWAP(short, wcol->shadetop, wcol->shadedown);
  }

  uiWidgetBase wtb;
  widget_init(&wtb);

  const float rad = wcol->roundness * U.widget_unit;
  round_box_edges(&wtb, roundboxalign, rect, rad);

  widgetbase_draw(&wtb, wcol);
}

static void widget_preview_tile(
    uiBut *but, uiWidgetColors *wcol, rcti *rect, int UNUSED(state), int UNUSED(roundboxalign))
{
  const uiStyle *style = UI_style_get();
  ui_draw_preview_item_stateless(
      &style->widget, rect, but->drawstr, but->icon, wcol->text, UI_STYLE_TEXT_CENTER);
}

static void widget_menuiconbut(uiWidgetColors *wcol,
                               rcti *rect,
                               int UNUSED(state),
                               int roundboxalign)
{
  uiWidgetBase wtb;
  widget_init(&wtb);

  const float rad = wcol->roundness * U.widget_unit;
  round_box_edges(&wtb, roundboxalign, rect, rad);

  /* decoration */
  widgetbase_draw(&wtb, wcol);
}

static void widget_pulldownbut(uiWidgetColors *wcol, rcti *rect, int state, int roundboxalign)
{
  float back[4];
  UI_GetThemeColor4fv(TH_BACK, back);

  if ((state & UI_ACTIVE) || (back[3] < 1.0f)) {
    uiWidgetBase wtb;
    const float rad = wcol->roundness * U.widget_unit;

    if (state & UI_ACTIVE) {
      copy_v4_v4_uchar(wcol->inner, wcol->inner_sel);
      copy_v3_v3_uchar(wcol->text, wcol->text_sel);
      copy_v3_v3_uchar(wcol->outline, wcol->inner);
    }
    else {
      wcol->inner[3] *= 1.0f - back[3];
      wcol->outline[3] = 0.0f;
    }

    widget_init(&wtb);

    /* half rounded */
    round_box_edges(&wtb, roundboxalign, rect, rad);

    widgetbase_draw(&wtb, wcol);
  }
}

static void widget_menu_itembut(uiWidgetColors *wcol,
                                rcti *rect,
                                int UNUSED(state),
                                int UNUSED(roundboxalign))
{
  uiWidgetBase wtb;
  widget_init(&wtb);

  /* not rounded, no outline */
  wtb.draw_outline = false;
  round_box_edges(&wtb, 0, rect, 0.0f);

  widgetbase_draw(&wtb, wcol);
}

static void widget_menu_radial_itembut(
    uiBut *but, uiWidgetColors *wcol, rcti *rect, int UNUSED(state), int UNUSED(roundboxalign))
{
  const float fac = but->block->pie_data.alphafac;

  uiWidgetBase wtb;
  widget_init(&wtb);

  wtb.draw_emboss = false;

  const float rad = wcol->roundness * BLI_rcti_size_y(rect);
  round_box_edges(&wtb, UI_CNR_ALL, rect, rad);

  wcol->inner[3] *= fac;
  wcol->inner_sel[3] *= fac;
  wcol->item[3] *= fac;
  wcol->text[3] *= fac;
  wcol->text_sel[3] *= fac;
  wcol->outline[3] *= fac;

  widgetbase_draw(&wtb, wcol);
}

static void widget_list_itembut(uiWidgetColors *wcol,
                                rcti *rect,
                                int UNUSED(state),
                                int UNUSED(roundboxalign))
{
  uiWidgetBase wtb;
  widget_init(&wtb);

  /* no outline */
  wtb.draw_outline = false;
  const float rad = wcol->roundness * U.widget_unit;
  round_box_edges(&wtb, UI_CNR_ALL, rect, rad);

  widgetbase_draw(&wtb, wcol);
}

static void widget_optionbut(uiWidgetColors *wcol,
                             rcti *rect,
                             int state,
                             int UNUSED(roundboxalign))
{
  const bool text_before_widget = (state & UI_STATE_TEXT_BEFORE_WIDGET);
  rcti recttemp = *rect;

  uiWidgetBase wtb;
  widget_init(&wtb);

  /* square */
  if (text_before_widget) {
    recttemp.xmin = recttemp.xmax - BLI_rcti_size_y(&recttemp);
  }
  else {
    recttemp.xmax = recttemp.xmin + BLI_rcti_size_y(&recttemp);
  }

  /* smaller */
  const int delta = (BLI_rcti_size_y(&recttemp) - 2 * U.pixelsize) / 6;
  BLI_rcti_resize(
      &recttemp, BLI_rcti_size_x(&recttemp) - delta * 2, BLI_rcti_size_y(&recttemp) - delta * 2);
  /* Keep one edge in place. */
  BLI_rcti_translate(&recttemp, text_before_widget ? delta : -delta, 0);

  const float rad = wcol->roundness * BLI_rcti_size_y(&recttemp);
  round_box_edges(&wtb, UI_CNR_ALL, &recttemp, rad);

  /* decoration */
  if (state & UI_SELECT) {
    shape_preset_trias_from_rect_checkmark(&wtb.tria1, &recttemp);
  }

  widgetbase_draw(&wtb, wcol);

  /* Text space - factor is really just eyeballed. */
  const float offset = delta * 0.9;
  if (text_before_widget) {
    rect->xmax = recttemp.xmin - offset;
  }
  else {
    rect->xmin = recttemp.xmax + offset;
  }
}

/* labels use Editor theme colors for text */
static void widget_state_label(uiWidgetType *wt, int state, int drawflag, eUIEmbossType emboss)
{
  if (state & UI_BUT_LIST_ITEM) {
    /* Override default label theme's colors. */
    bTheme *btheme = UI_GetTheme();
    wt->wcol_theme = &btheme->tui.wcol_list_item;
    /* call this for option button */
    widget_state(wt, state, drawflag, emboss);
  }
  else {
    /* call this for option button */
    widget_state(wt, state, drawflag, emboss);
    if (state & UI_SELECT) {
      UI_GetThemeColor3ubv(TH_TEXT_HI, wt->wcol.text);
    }
    else {
      UI_GetThemeColor3ubv(TH_TEXT, wt->wcol.text);
    }
  }

  if (state & UI_BUT_REDALERT) {
    const uchar red[4] = {255, 0, 0};
    color_blend_v3_v3(wt->wcol.text, red, 0.4f);
  }
}

static void widget_radiobut(uiWidgetColors *wcol, rcti *rect, int UNUSED(state), int roundboxalign)
{
  uiWidgetBase wtb;
  widget_init(&wtb);

  const float rad = wcol->roundness * U.widget_unit;
  round_box_edges(&wtb, roundboxalign, rect, rad);

  widgetbase_draw(&wtb, wcol);
}

static void widget_box(
    uiBut *but, uiWidgetColors *wcol, rcti *rect, int UNUSED(state), int roundboxalign)
{
  uiWidgetBase wtb;
  widget_init(&wtb);

  uchar old_col[3];
  copy_v3_v3_uchar(old_col, wcol->inner);

  /* abuse but->hsv - if it's non-zero, use this color as the box's background */
  if (but != NULL && but->col[3]) {
    wcol->inner[0] = but->col[0];
    wcol->inner[1] = but->col[1];
    wcol->inner[2] = but->col[2];
    wcol->inner[3] = but->col[3];
  }

  const float rad = wcol->roundness * U.widget_unit;
  round_box_edges(&wtb, roundboxalign, rect, rad);

  widgetbase_draw(&wtb, wcol);

  copy_v3_v3_uchar(wcol->inner, old_col);
}

static void widget_but(uiWidgetColors *wcol, rcti *rect, int UNUSED(state), int roundboxalign)
{
  uiWidgetBase wtb;
  widget_init(&wtb);

  const float rad = wcol->roundness * U.widget_unit;
  round_box_edges(&wtb, roundboxalign, rect, rad);

  widgetbase_draw(&wtb, wcol);
}

#if 0
static void widget_roundbut(uiWidgetColors *wcol, rcti *rect, int UNUSED(state), int roundboxalign)
{
  uiWidgetBase wtb;
  const float rad = wcol->roundness * U.widget_unit;

  widget_init(&wtb);

  /* half rounded */
  round_box_edges(&wtb, roundboxalign, rect, rad);

  widgetbase_draw(&wtb, wcol);
}
#endif

static void widget_roundbut_exec(uiWidgetColors *wcol, rcti *rect, int state, int roundboxalign)
{
  const float rad = wcol->roundness * U.widget_unit;

  uiWidgetBase wtb;
  widget_init(&wtb);

  if (state & UI_STATE_HOLD_ACTION) {
    /* Show that keeping pressed performs another action (typically a menu). */
    shape_preset_init_hold_action(&wtb.tria1, rect, 0.75f, 'r');
  }

  /* half rounded */
  round_box_edges(&wtb, roundboxalign, rect, rad);

  widgetbase_draw(&wtb, wcol);
}

static void widget_tab(uiWidgetColors *wcol, rcti *rect, int state, int roundboxalign)
{
  const float rad = wcol->roundness * U.widget_unit;
  const bool is_active = (state & UI_SELECT);

  /* Draw shaded outline - Disabled for now,
   * seems incorrect and also looks nicer without it imho ;) */
  // #define USE_TAB_SHADED_HIGHLIGHT

  uchar theme_col_tab_highlight[3];

#ifdef USE_TAB_SHADED_HIGHLIGHT
  /* create outline highlight colors */
  if (is_active) {
    interp_v3_v3v3_uchar(theme_col_tab_highlight, wcol->inner_sel, wcol->outline, 0.2f);
  }
  else {
    interp_v3_v3v3_uchar(theme_col_tab_highlight, wcol->inner, wcol->outline, 0.12f);
  }
#endif

  uiWidgetBase wtb;
  widget_init(&wtb);

  /* half rounded */
  round_box_edges(&wtb, roundboxalign, rect, rad);

  /* draw inner */
#ifdef USE_TAB_SHADED_HIGHLIGHT
  wtb.draw_outline = 0;
#endif
  widgetbase_draw(&wtb, wcol);

  /* We are drawing on top of widget bases. Flush cache. */
  GPU_blend(GPU_BLEND_ALPHA);
  UI_widgetbase_draw_cache_flush();
  GPU_blend(GPU_BLEND_NONE);

#ifdef USE_TAB_SHADED_HIGHLIGHT
  /* draw outline (3d look) */
  ui_draw_but_TAB_outline(rect, rad, theme_col_tab_highlight, wcol->inner);
#endif

#ifndef USE_TAB_SHADED_HIGHLIGHT
  UNUSED_VARS(is_active, theme_col_tab_highlight);
#endif
}

static void widget_draw_extra_mask(const bContext *C, uiBut *but, uiWidgetType *wt, rcti *rect)
{
  bTheme *btheme = UI_GetTheme();
  uiWidgetColors *wcol = &btheme->tui.wcol_radio;
  const float rad = wcol->roundness * U.widget_unit;

  /* state copy! */
  wt->wcol = *(wt->wcol_theme);

  uiWidgetBase wtb;
  widget_init(&wtb);

  if (but->block->drawextra) {
    /* NOTE: drawextra can change rect +1 or -1, to match round errors of existing previews. */
    but->block->drawextra(
        C, but->poin, but->block->drawextra_arg1, but->block->drawextra_arg2, rect);

    const uint pos = GPU_vertformat_attr_add(
        immVertexFormat(), "pos", GPU_COMP_F32, 2, GPU_FETCH_FLOAT);
    immBindBuiltinProgram(GPU_SHADER_2D_UNIFORM_COLOR);

    /* make mask to draw over image */
    uchar col[4];
    UI_GetThemeColor3ubv(TH_BACK, col);
    immUniformColor3ubv(col);

    round_box__edges(&wtb, UI_CNR_ALL, rect, 0.0f, rad);
    widgetbase_outline(&wtb, pos);

    immUnbindProgram();
  }

  /* outline */
  round_box_edges(&wtb, UI_CNR_ALL, rect, rad);
  wtb.draw_outline = true;
  wtb.draw_inner = false;
  widgetbase_draw(&wtb, &wt->wcol);
}

static uiWidgetType *widget_type(uiWidgetTypeEnum type)
{
  bTheme *btheme = UI_GetTheme();

  /* defaults */
  static uiWidgetType wt;
  wt.wcol_theme = &btheme->tui.wcol_regular;
  wt.wcol_state = &btheme->tui.wcol_state;
  wt.state = widget_state;
  wt.draw = widget_but;
  wt.custom = NULL;
  wt.text = widget_draw_text_icon;

  switch (type) {
    case UI_WTYPE_REGULAR:
      break;

    case UI_WTYPE_LABEL:
      wt.draw = NULL;
      wt.state = widget_state_label;
      break;

    case UI_WTYPE_TOGGLE:
      wt.wcol_theme = &btheme->tui.wcol_toggle;
      break;

    case UI_WTYPE_CHECKBOX:
      wt.wcol_theme = &btheme->tui.wcol_option;
      wt.draw = widget_optionbut;
      break;

    case UI_WTYPE_RADIO:
      wt.wcol_theme = &btheme->tui.wcol_radio;
      wt.draw = widget_radiobut;
      break;

    case UI_WTYPE_NUMBER:
      wt.wcol_theme = &btheme->tui.wcol_num;
      wt.draw = widget_numbut;
      break;

    case UI_WTYPE_SLIDER:
      wt.wcol_theme = &btheme->tui.wcol_numslider;
      wt.custom = widget_numslider;
      wt.state = widget_state_numslider;
      break;

    case UI_WTYPE_EXEC:
      wt.wcol_theme = &btheme->tui.wcol_tool;
      wt.draw = widget_roundbut_exec;
      break;

    case UI_WTYPE_TOOLBAR_ITEM:
      wt.wcol_theme = &btheme->tui.wcol_toolbar_item;
      wt.draw = widget_roundbut_exec;
      break;

    case UI_WTYPE_TAB:
      wt.wcol_theme = &btheme->tui.wcol_tab;
      wt.draw = widget_tab;
      break;

    case UI_WTYPE_TOOLTIP:
      wt.wcol_theme = &btheme->tui.wcol_tooltip;
      wt.draw = widget_menu_back;
      break;

    /* strings */
    case UI_WTYPE_NAME:
      wt.wcol_theme = &btheme->tui.wcol_text;
      wt.draw = widget_textbut;
      break;

    case UI_WTYPE_NAME_LINK:
      break;

    case UI_WTYPE_POINTER_LINK:
      break;

    case UI_WTYPE_FILENAME:
      break;

    /* start menus */
    case UI_WTYPE_MENU_RADIO:
      wt.wcol_theme = &btheme->tui.wcol_menu;
      wt.draw = widget_menubut;
      break;

    case UI_WTYPE_MENU_ICON_RADIO:
    case UI_WTYPE_MENU_NODE_LINK:
      wt.wcol_theme = &btheme->tui.wcol_menu;
      wt.draw = widget_menuiconbut;
      break;

    case UI_WTYPE_MENU_POINTER_LINK:
      wt.wcol_theme = &btheme->tui.wcol_menu;
      wt.draw = widget_menubut;
      break;

    case UI_WTYPE_PULLDOWN:
      wt.wcol_theme = &btheme->tui.wcol_pulldown;
      wt.draw = widget_pulldownbut;
      wt.state = widget_state_pulldown;
      break;

    /* in menus */
    case UI_WTYPE_MENU_ITEM:
      wt.wcol_theme = &btheme->tui.wcol_menu_item;
      wt.draw = widget_menu_itembut;
      wt.state = widget_state_menu_item;
      break;

    case UI_WTYPE_MENU_BACK:
      wt.wcol_theme = &btheme->tui.wcol_menu_back;
      wt.draw = widget_menu_back;
      break;

    /* specials */
    case UI_WTYPE_ICON:
      wt.custom = widget_icon_has_anim;
      break;

    case UI_WTYPE_ICON_LABEL:
      /* behave like regular labels (this is simply a label with an icon) */
      wt.state = widget_state_label;
      wt.custom = widget_icon_has_anim;
      break;

    case UI_WTYPE_PREVIEW_TILE:
      wt.draw = NULL;
      /* Drawn via the `custom` callback. */
      wt.text = NULL;
      wt.custom = widget_preview_tile;
      break;

    case UI_WTYPE_SWATCH:
      wt.custom = widget_swatch;
      break;

    case UI_WTYPE_BOX:
      wt.custom = widget_box;
      wt.wcol_theme = &btheme->tui.wcol_box;
      break;

    case UI_WTYPE_RGB_PICKER:
      break;

    case UI_WTYPE_UNITVEC:
      wt.custom = widget_unitvec;
      break;

    case UI_WTYPE_SCROLL:
      wt.wcol_theme = &btheme->tui.wcol_scroll;
      wt.state = widget_state_nothing;
      wt.custom = widget_scroll;
      break;

    case UI_WTYPE_LISTITEM:
      wt.wcol_theme = &btheme->tui.wcol_list_item;
      wt.draw = widget_list_itembut;
      break;

    case UI_WTYPE_PROGRESSBAR:
      wt.wcol_theme = &btheme->tui.wcol_progress;
      wt.custom = widget_progressbar;
      break;

    case UI_WTYPE_DATASETROW:
      wt.custom = widget_datasetrow;
      break;

    case UI_WTYPE_NODESOCKET:
      wt.custom = widget_nodesocket;
      break;

    case UI_WTYPE_MENU_ITEM_RADIAL:
      wt.wcol_theme = &btheme->tui.wcol_pie_menu;
      wt.custom = widget_menu_radial_itembut;
      wt.state = widget_state_pie_menu_item;
      break;
  }

  return &wt;
}

static int widget_roundbox_set(uiBut *but, rcti *rect)
{
  int roundbox = UI_CNR_ALL;

  /* alignment */
  if ((but->drawflag & UI_BUT_ALIGN) && but->type != UI_BTYPE_PULLDOWN) {

    /* ui_popup_block_position has this correction too, keep in sync */
    if (but->drawflag & (UI_BUT_ALIGN_TOP | UI_BUT_ALIGN_STITCH_TOP)) {
      rect->ymax += U.pixelsize;
    }
    if (but->drawflag & (UI_BUT_ALIGN_LEFT | UI_BUT_ALIGN_STITCH_LEFT)) {
      rect->xmin -= U.pixelsize;
    }

    switch (but->drawflag & UI_BUT_ALIGN) {
      case UI_BUT_ALIGN_TOP:
        roundbox = UI_CNR_BOTTOM_LEFT | UI_CNR_BOTTOM_RIGHT;
        break;
      case UI_BUT_ALIGN_DOWN:
        roundbox = UI_CNR_TOP_LEFT | UI_CNR_TOP_RIGHT;
        break;
      case UI_BUT_ALIGN_LEFT:
        roundbox = UI_CNR_TOP_RIGHT | UI_CNR_BOTTOM_RIGHT;
        break;
      case UI_BUT_ALIGN_RIGHT:
        roundbox = UI_CNR_TOP_LEFT | UI_CNR_BOTTOM_LEFT;
        break;
      case UI_BUT_ALIGN_DOWN | UI_BUT_ALIGN_RIGHT:
        roundbox = UI_CNR_TOP_LEFT;
        break;
      case UI_BUT_ALIGN_DOWN | UI_BUT_ALIGN_LEFT:
        roundbox = UI_CNR_TOP_RIGHT;
        break;
      case UI_BUT_ALIGN_TOP | UI_BUT_ALIGN_RIGHT:
        roundbox = UI_CNR_BOTTOM_LEFT;
        break;
      case UI_BUT_ALIGN_TOP | UI_BUT_ALIGN_LEFT:
        roundbox = UI_CNR_BOTTOM_RIGHT;
        break;
      default:
        roundbox = 0;
        break;
    }
  }

  /* align with open menu */
  if (but->active && (but->type != UI_BTYPE_POPOVER) && !ui_but_menu_draw_as_popover(but)) {
    const int direction = ui_but_menu_direction(but);

    if (direction == UI_DIR_UP) {
      roundbox &= ~(UI_CNR_TOP_RIGHT | UI_CNR_TOP_LEFT);
    }
    else if (direction == UI_DIR_DOWN) {
      roundbox &= ~(UI_CNR_BOTTOM_RIGHT | UI_CNR_BOTTOM_LEFT);
    }
    else if (direction == UI_DIR_LEFT) {
      roundbox &= ~(UI_CNR_TOP_LEFT | UI_CNR_BOTTOM_LEFT);
    }
    else if (direction == UI_DIR_RIGHT) {
      roundbox &= ~(UI_CNR_TOP_RIGHT | UI_CNR_BOTTOM_RIGHT);
    }
  }

  return roundbox;
}

/* -------------------------------------------------------------------- */
/** \name Public API
 * \{ */

/* conversion from old to new buttons, so still messy */
void ui_draw_but(const bContext *C, struct ARegion *region, uiStyle *style, uiBut *but, rcti *rect)
{
  bTheme *btheme = UI_GetTheme();
  const ThemeUI *tui = &btheme->tui;
  const uiFontStyle *fstyle = &style->widget;
  uiWidgetType *wt = NULL;

  /* handle menus separately */
  if (but->emboss == UI_EMBOSS_PULLDOWN) {
    switch (but->type) {
      case UI_BTYPE_LABEL:
        widget_draw_text_icon(&style->widgetlabel, &tui->wcol_menu_back, but, rect);
        break;
      case UI_BTYPE_SEPR_LINE:
        ui_draw_separator(rect, &tui->wcol_menu_item);
        break;
      default:
        wt = widget_type(UI_WTYPE_MENU_ITEM);
        break;
    }
  }
  else if (ELEM(but->emboss, UI_EMBOSS_NONE, UI_EMBOSS_NONE_OR_STATUS)) {
    /* Use the same widget types for both no emboss types. Later on,
     * #UI_EMBOSS_NONE_OR_STATUS will blend state colors if they apply. */
    switch (but->type) {
      case UI_BTYPE_LABEL:
        wt = widget_type(UI_WTYPE_ICON_LABEL);
        break;
      default:
        wt = widget_type(UI_WTYPE_ICON);
        break;
    }
  }
  else if (but->emboss == UI_EMBOSS_RADIAL) {
    wt = widget_type(UI_WTYPE_MENU_ITEM_RADIAL);
  }
  else {
    BLI_assert(but->emboss == UI_EMBOSS);

    switch (but->type) {
      case UI_BTYPE_LABEL:
        wt = widget_type(UI_WTYPE_LABEL);
        fstyle = &style->widgetlabel;
        if (but->drawflag & UI_BUT_BOX_ITEM) {
          wt->wcol_theme = &tui->wcol_box;
          wt->state = widget_state;
        }
        else if (but->block->theme_style == UI_BLOCK_THEME_STYLE_POPUP) {
          wt->wcol_theme = &tui->wcol_menu_back;
          wt->state = widget_state;
        }
        if (!(but->flag & UI_HAS_ICON)) {
          but->drawflag |= UI_BUT_NO_TEXT_PADDING;
        }
        break;

      case UI_BTYPE_SEPR:
      case UI_BTYPE_SEPR_LINE:
      case UI_BTYPE_SEPR_SPACER:
        break;

      case UI_BTYPE_BUT:
      case UI_BTYPE_DECORATOR:
#ifdef USE_UI_TOOLBAR_HACK
        if ((but->icon != ICON_NONE) && UI_but_is_tool(but)) {
          wt = widget_type(UI_WTYPE_TOOLBAR_ITEM);
        }
        else {
          wt = widget_type(UI_WTYPE_EXEC);
        }
#else
        wt = widget_type(UI_WTYPE_EXEC);
#endif
        break;

      case UI_BTYPE_NUM:
        wt = widget_type(UI_WTYPE_NUMBER);
        break;

      case UI_BTYPE_NUM_SLIDER:
        wt = widget_type(UI_WTYPE_SLIDER);
        break;

      case UI_BTYPE_ROW:
        wt = widget_type(UI_WTYPE_RADIO);
        break;

      case UI_BTYPE_LISTROW:
        wt = widget_type(UI_WTYPE_LISTITEM);
        break;

      case UI_BTYPE_TEXT:
        wt = widget_type(UI_WTYPE_NAME);
        break;

      case UI_BTYPE_SEARCH_MENU:
        wt = widget_type(UI_WTYPE_NAME);
        break;

      case UI_BTYPE_TAB:
        wt = widget_type(UI_WTYPE_TAB);
        break;

      case UI_BTYPE_BUT_TOGGLE:
      case UI_BTYPE_TOGGLE:
      case UI_BTYPE_TOGGLE_N:
        wt = widget_type(UI_WTYPE_TOGGLE);
        break;

      case UI_BTYPE_CHECKBOX:
      case UI_BTYPE_CHECKBOX_N:
        if (!(but->flag & UI_HAS_ICON)) {
          wt = widget_type(UI_WTYPE_CHECKBOX);

          if ((but->drawflag & (UI_BUT_TEXT_LEFT | UI_BUT_TEXT_RIGHT)) == 0) {
            but->drawflag |= UI_BUT_TEXT_LEFT;
          }
          /* #widget_optionbut() carefully sets the text rectangle for fine tuned paddings. If the
           * text drawing were to add its own padding, DPI and zoom factor would be applied twice
           * in the final padding, so it's difficult to control it. */
          but->drawflag |= UI_BUT_NO_TEXT_PADDING;
        }
        else {
          wt = widget_type(UI_WTYPE_TOGGLE);
        }

        /* option buttons have strings outside, on menus use different colors */
        if (but->block->theme_style == UI_BLOCK_THEME_STYLE_POPUP) {
          wt->state = widget_state_option_menu;
        }
        break;

      case UI_BTYPE_MENU:
      case UI_BTYPE_BLOCK:
      case UI_BTYPE_POPOVER:
        if (but->flag & UI_BUT_NODE_LINK) {
          /* new node-link button, not active yet XXX */
          wt = widget_type(UI_WTYPE_MENU_NODE_LINK);
        }
        else {
          /* with menu arrows */

          /* We could use a flag for this, but for now just check size,
           * add up/down arrows if there is room. */
          if ((!but->str[0] && but->icon && (BLI_rcti_size_x(rect) < BLI_rcti_size_y(rect) + 2)) ||
              /* disable for brushes also */
              (but->flag & UI_BUT_ICON_PREVIEW)) {
            /* no arrows */
            wt = widget_type(UI_WTYPE_MENU_ICON_RADIO);
          }
          else {
            wt = widget_type(UI_WTYPE_MENU_RADIO);
          }
        }
        break;

      case UI_BTYPE_PULLDOWN:
        wt = widget_type(UI_WTYPE_PULLDOWN);
        break;

      case UI_BTYPE_BUT_MENU:
        wt = widget_type(UI_WTYPE_MENU_ITEM);
        break;

      case UI_BTYPE_COLOR:
        wt = widget_type(UI_WTYPE_SWATCH);
        break;

      case UI_BTYPE_ROUNDBOX:
      case UI_BTYPE_LISTBOX:
        wt = widget_type(UI_WTYPE_BOX);
        break;

      case UI_BTYPE_PREVIEW_TILE:
        wt = widget_type(UI_WTYPE_PREVIEW_TILE);
        break;

      case UI_BTYPE_EXTRA:
        widget_draw_extra_mask(C, but, widget_type(UI_WTYPE_BOX), rect);
        break;

      case UI_BTYPE_HSVCUBE: {
        const uiButHSVCube *hsv_but = (uiButHSVCube *)but;

        if (ELEM(hsv_but->gradient_type, UI_GRAD_V_ALT, UI_GRAD_L_ALT)) {
          /* vertical V slider, uses new widget draw now */
          ui_draw_but_HSV_v(but, rect);
        }
        else { /* other HSV pickers... */
          ui_draw_but_HSVCUBE(but, rect);
        }
        break;
      }

      case UI_BTYPE_HSVCIRCLE:
        ui_draw_but_HSVCIRCLE(but, &tui->wcol_regular, rect);
        break;

      case UI_BTYPE_COLORBAND:
        /* do not draw right to edge of rect */
        rect->xmin += (0.25f * UI_UNIT_X);
        rect->xmax -= (0.3f * UI_UNIT_X);
        ui_draw_but_COLORBAND(but, &tui->wcol_regular, rect);
        break;

      case UI_BTYPE_UNITVEC:
        wt = widget_type(UI_WTYPE_UNITVEC);
        break;

      case UI_BTYPE_IMAGE:
        ui_draw_but_IMAGE(region, but, &tui->wcol_regular, rect);
        break;

      case UI_BTYPE_HISTOGRAM:
        ui_draw_but_HISTOGRAM(region, but, &tui->wcol_regular, rect);
        break;

      case UI_BTYPE_WAVEFORM:
        ui_draw_but_WAVEFORM(region, but, &tui->wcol_regular, rect);
        break;

      case UI_BTYPE_VECTORSCOPE:
        ui_draw_but_VECTORSCOPE(region, but, &tui->wcol_regular, rect);
        break;

      case UI_BTYPE_CURVE:
        /* do not draw right to edge of rect */
        rect->xmin += (0.2f * UI_UNIT_X);
        rect->xmax -= (0.2f * UI_UNIT_X);
        ui_draw_but_CURVE(region, but, &tui->wcol_regular, rect);
        break;

      case UI_BTYPE_CURVEPROFILE:
        ui_draw_but_CURVEPROFILE(region, but, &tui->wcol_regular, rect);
        break;

      case UI_BTYPE_PROGRESS_BAR:
        wt = widget_type(UI_WTYPE_PROGRESSBAR);
        fstyle = &style->widgetlabel;
        break;

      case UI_BTYPE_DATASETROW:
        wt = widget_type(UI_WTYPE_DATASETROW);
        fstyle = &style->widgetlabel;
        break;

      case UI_BTYPE_SCROLL:
        wt = widget_type(UI_WTYPE_SCROLL);
        break;

      case UI_BTYPE_GRIP:
        wt = widget_type(UI_WTYPE_ICON);
        break;

      case UI_BTYPE_TRACK_PREVIEW:
        ui_draw_but_TRACKPREVIEW(region, but, &tui->wcol_regular, rect);
        break;

      case UI_BTYPE_NODE_SOCKET:
        wt = widget_type(UI_WTYPE_NODESOCKET);
        break;

      default:
        wt = widget_type(UI_WTYPE_REGULAR);
        break;
    }
  }

  if (wt == NULL) {
    return;
  }

  // rcti disablerect = *rect; /* rect gets clipped smaller for text */

  const int roundboxalign = widget_roundbox_set(but, rect);

  /* Mask out flags re-used for local state. */
  int state = but->flag & ~UI_STATE_FLAGS_ALL;
  const int drawflag = but->drawflag;

  if (state & UI_SELECT_DRAW) {
    state |= UI_SELECT;
  }

  if ((but->editstr) ||
      (UNLIKELY(but->flag & UI_BUT_DRAG_MULTI) && ui_but_drag_multi_edit_get(but))) {
    state |= UI_STATE_TEXT_INPUT;
  }

  if (but->hold_func) {
    state |= UI_STATE_HOLD_ACTION;
  }

  if (state & UI_ACTIVE) {
    if (but->drawflag & UI_BUT_ACTIVE_LEFT) {
      state |= UI_STATE_ACTIVE_LEFT;
    }
    else if (but->drawflag & UI_BUT_ACTIVE_RIGHT) {
      state |= UI_STATE_ACTIVE_RIGHT;
    }
  }

  bool use_alpha_blend = false;
  if (but->emboss != UI_EMBOSS_PULLDOWN) {
    if (state & (UI_BUT_DISABLED | UI_BUT_INACTIVE | UI_SEARCH_FILTER_NO_MATCH)) {
      use_alpha_blend = true;
      ui_widget_color_disabled(wt, state);
    }
  }

  if (drawflag & UI_BUT_TEXT_RIGHT) {
    state |= UI_STATE_TEXT_BEFORE_WIDGET;
  }

#ifdef USE_UI_POPOVER_ONCE
  if (but->block->flag & UI_BLOCK_POPOVER_ONCE) {
    if ((state & UI_ACTIVE) && ui_but_is_popover_once_compat(but)) {
      state |= UI_BUT_ACTIVE_DEFAULT;
    }
  }
#endif

  wt->state(wt, state, drawflag, but->emboss);
  if (wt->custom) {
    wt->custom(but, &wt->wcol, rect, state, roundboxalign);
  }
  else if (wt->draw) {
    wt->draw(&wt->wcol, rect, state, roundboxalign);
  }

  if (wt->text) {
    if (use_alpha_blend) {
      GPU_blend(GPU_BLEND_ALPHA);
    }

    wt->text(fstyle, &wt->wcol, but, rect);
    if (use_alpha_blend) {
      GPU_blend(GPU_BLEND_NONE);
    }
  }
}

static void ui_draw_clip_tri(uiBlock *block, rcti *rect, uiWidgetType *wt)
{
  if (block) {
    float draw_color[4];
    const uchar *color = wt->wcol.text;

    draw_color[0] = ((float)color[0]) / 255.0f;
    draw_color[1] = ((float)color[1]) / 255.0f;
    draw_color[2] = ((float)color[2]) / 255.0f;
    draw_color[3] = 1.0f;

    if (block->flag & UI_BLOCK_CLIPTOP) {
      /* XXX no scaling for UI here yet */
      UI_draw_icon_tri(BLI_rcti_cent_x(rect), rect->ymax - 6 * U.dpi_fac, 't', draw_color);
    }
    if (block->flag & UI_BLOCK_CLIPBOTTOM) {
      /* XXX no scaling for UI here yet */
      UI_draw_icon_tri(BLI_rcti_cent_x(rect), rect->ymin + 10 * U.dpi_fac, 'v', draw_color);
    }
  }
}

void ui_draw_menu_back(uiStyle *UNUSED(style), uiBlock *block, rcti *rect)
{
  uiWidgetType *wt = widget_type(UI_WTYPE_MENU_BACK);

  wt->state(wt, 0, 0, UI_EMBOSS_UNDEFINED);
  if (block) {
    wt->draw(&wt->wcol, rect, block->flag, block->direction);
  }
  else {
    wt->draw(&wt->wcol, rect, 0, 0);
  }

  ui_draw_clip_tri(block, rect, wt);
}

/**
 * Uses the widget base drawing and colors from the box widget, but ensures an opaque
 * inner color.
 */
void ui_draw_box_opaque(rcti *rect, int roundboxalign)
{
  uiWidgetType *wt = widget_type(UI_WTYPE_BOX);

  /* Alpha blend with the region's background color to force an opaque background. */
  uiWidgetColors *wcol = &wt->wcol;
  wt->state(wt, 0, 0, UI_EMBOSS_UNDEFINED);
  float background[4];
  UI_GetThemeColor4fv(TH_BACK, background);
  float new_inner[4];
  rgba_uchar_to_float(new_inner, wcol->inner);
  new_inner[0] = (new_inner[0] * new_inner[3]) + (background[0] * (1.0f - new_inner[3]));
  new_inner[1] = (new_inner[1] * new_inner[3]) + (background[1] * (1.0f - new_inner[3]));
  new_inner[2] = (new_inner[2] * new_inner[3]) + (background[2] * (1.0f - new_inner[3]));
  new_inner[3] = 1.0f;
  rgba_float_to_uchar(wcol->inner, new_inner);

  wt->custom(NULL, wcol, rect, 0, roundboxalign);
}

/**
 * Similar to 'widget_menu_back', however we can't use the widget preset system
 * because we need to pass in the original location so we know where to show the arrow.
 */
static void ui_draw_popover_back_impl(const uiWidgetColors *wcol,
                                      rcti *rect,
                                      int direction,
                                      const float unit_size,
                                      const float mval_origin[2])
{
  /* tsk, this isn't nice. */
  const float unit_half = unit_size / 2;
  const float cent_x = mval_origin ? CLAMPIS(mval_origin[0],
                                             rect->xmin + unit_size,
                                             rect->xmax - unit_size) :
                                     BLI_rcti_cent_x(rect);

  GPU_blend(GPU_BLEND_ALPHA);

  /* Extracted from 'widget_menu_back', keep separate to avoid menu changes breaking popovers */
  {
    uiWidgetBase wtb;
    widget_init(&wtb);

    const int roundboxalign = UI_CNR_ALL;
    widget_softshadow(rect, roundboxalign, wcol->roundness * U.widget_unit);

    round_box_edges(&wtb, roundboxalign, rect, wcol->roundness * U.widget_unit);
    wtb.draw_emboss = false;
    widgetbase_draw(&wtb, wcol);
  }

  /* Draw popover arrow (top/bottom) */
  if (ELEM(direction, UI_DIR_UP, UI_DIR_DOWN)) {
    const uint pos = GPU_vertformat_attr_add(
        immVertexFormat(), "pos", GPU_COMP_F32, 2, GPU_FETCH_FLOAT);
    immBindBuiltinProgram(GPU_SHADER_2D_UNIFORM_COLOR);

    const bool is_down = (direction == UI_DIR_DOWN);
    const int sign = is_down ? 1 : -1;
    float y = is_down ? rect->ymax : rect->ymin;

    GPU_blend(GPU_BLEND_ALPHA);
    immBegin(GPU_PRIM_TRIS, 3);
    immUniformColor4ubv(wcol->outline);
    immVertex2f(pos, cent_x - unit_half, y);
    immVertex2f(pos, cent_x + unit_half, y);
    immVertex2f(pos, cent_x, y + sign * unit_half);
    immEnd();

    y = y - sign * round(U.pixelsize * 1.41);

    GPU_blend(GPU_BLEND_NONE);
    immBegin(GPU_PRIM_TRIS, 3);
    immUniformColor4ub(0, 0, 0, 0);
    immVertex2f(pos, cent_x - unit_half, y);
    immVertex2f(pos, cent_x + unit_half, y);
    immVertex2f(pos, cent_x, y + sign * unit_half);
    immEnd();

    GPU_blend(GPU_BLEND_ALPHA);
    immBegin(GPU_PRIM_TRIS, 3);
    immUniformColor4ubv(wcol->inner);
    immVertex2f(pos, cent_x - unit_half, y);
    immVertex2f(pos, cent_x + unit_half, y);
    immVertex2f(pos, cent_x, y + sign * unit_half);
    immEnd();

    immUnbindProgram();
  }

  GPU_blend(GPU_BLEND_NONE);
}

void ui_draw_popover_back(struct ARegion *region,
                          uiStyle *UNUSED(style),
                          uiBlock *block,
                          rcti *rect)
{
  uiWidgetType *wt = widget_type(UI_WTYPE_MENU_BACK);

  if (block) {
    float mval_origin[2] = {UNPACK2(block->bounds_offset)};
    ui_window_to_block_fl(region, block, &mval_origin[0], &mval_origin[1]);
    ui_draw_popover_back_impl(
        wt->wcol_theme, rect, block->direction, U.widget_unit / block->aspect, mval_origin);
  }
  else {
    wt->state(wt, 0, 0, UI_EMBOSS_UNDEFINED);
    wt->draw(&wt->wcol, rect, 0, 0);
  }

  ui_draw_clip_tri(block, rect, wt);
}

static void draw_disk_shaded(float start,
                             float angle,
                             float radius_int,
                             float radius_ext,
                             int subd,
                             const uchar col1[4],
                             const uchar col2[4],
                             bool shaded)
{
  const float radius_ext_scale = (0.5f / radius_ext); /* 1 / (2 * radius_ext) */

  uint col;
  GPUVertFormat *format = immVertexFormat();
  const uint pos = GPU_vertformat_attr_add(format, "pos", GPU_COMP_F32, 2, GPU_FETCH_FLOAT);
  if (shaded) {
    col = GPU_vertformat_attr_add(format, "color", GPU_COMP_U8, 4, GPU_FETCH_INT_TO_FLOAT_UNIT);
    immBindBuiltinProgram(GPU_SHADER_2D_SMOOTH_COLOR);
  }
  else {
    immBindBuiltinProgram(GPU_SHADER_2D_UNIFORM_COLOR);
    immUniformColor4ubv(col1);
  }

  immBegin(GPU_PRIM_TRI_STRIP, subd * 2);
  for (int i = 0; i < subd; i++) {
    const float a = start + ((i) / (float)(subd - 1)) * angle;
    const float s = sinf(a);
    const float c = cosf(a);
    const float y1 = s * radius_int;
    const float y2 = s * radius_ext;

    if (shaded) {
      uchar r_col[4];
      const float fac = (y1 + radius_ext) * radius_ext_scale;
      color_blend_v4_v4v4(r_col, col1, col2, fac);
      immAttr4ubv(col, r_col);
    }
    immVertex2f(pos, c * radius_int, s * radius_int);

    if (shaded) {
      uchar r_col[4];
      const float fac = (y2 + radius_ext) * radius_ext_scale;
      color_blend_v4_v4v4(r_col, col1, col2, fac);
      immAttr4ubv(col, r_col);
    }
    immVertex2f(pos, c * radius_ext, s * radius_ext);
  }
  immEnd();

  immUnbindProgram();
}

void ui_draw_pie_center(uiBlock *block)
{
  bTheme *btheme = UI_GetTheme();
  const float cx = block->pie_data.pie_center_spawned[0];
  const float cy = block->pie_data.pie_center_spawned[1];

  float *pie_dir = block->pie_data.pie_dir;

  const float pie_radius_internal = U.dpi_fac * U.pie_menu_threshold;
  const float pie_radius_external = U.dpi_fac * (U.pie_menu_threshold + 7.0f);

  const int subd = 40;

  const float angle = atan2f(pie_dir[1], pie_dir[0]);
  const float range = (block->pie_data.flags & UI_PIE_DEGREES_RANGE_LARGE) ? M_PI_2 : M_PI_4;

  GPU_matrix_push();
  GPU_matrix_translate_2f(cx, cy);

  GPU_blend(GPU_BLEND_ALPHA);
  if (btheme->tui.wcol_pie_menu.shaded) {
    uchar col1[4], col2[4];
    shadecolors4(col1,
                 col2,
                 btheme->tui.wcol_pie_menu.inner,
                 btheme->tui.wcol_pie_menu.shadetop,
                 btheme->tui.wcol_pie_menu.shadedown);
    draw_disk_shaded(0.0f,
                     (float)(M_PI * 2.0),
                     pie_radius_internal,
                     pie_radius_external,
                     subd,
                     col1,
                     col2,
                     true);
  }
  else {
    draw_disk_shaded(0.0f,
                     (float)(M_PI * 2.0),
                     pie_radius_internal,
                     pie_radius_external,
                     subd,
                     btheme->tui.wcol_pie_menu.inner,
                     NULL,
                     false);
  }

  if (!(block->pie_data.flags & UI_PIE_INVALID_DIR)) {
    if (btheme->tui.wcol_pie_menu.shaded) {
      uchar col1[4], col2[4];
      shadecolors4(col1,
                   col2,
                   btheme->tui.wcol_pie_menu.inner_sel,
                   btheme->tui.wcol_pie_menu.shadetop,
                   btheme->tui.wcol_pie_menu.shadedown);
      draw_disk_shaded(angle - range / 2.0f,
                       range,
                       pie_radius_internal,
                       pie_radius_external,
                       subd,
                       col1,
                       col2,
                       true);
    }
    else {
      draw_disk_shaded(angle - range / 2.0f,
                       range,
                       pie_radius_internal,
                       pie_radius_external,
                       subd,
                       btheme->tui.wcol_pie_menu.inner_sel,
                       NULL,
                       false);
    }
  }

  GPUVertFormat *format = immVertexFormat();
  const uint pos = GPU_vertformat_attr_add(format, "pos", GPU_COMP_F32, 2, GPU_FETCH_FLOAT);
  immBindBuiltinProgram(GPU_SHADER_2D_UNIFORM_COLOR);
  immUniformColor4ubv(btheme->tui.wcol_pie_menu.outline);

  imm_draw_circle_wire_2d(pos, 0.0f, 0.0f, pie_radius_internal, subd);
  imm_draw_circle_wire_2d(pos, 0.0f, 0.0f, pie_radius_external, subd);

  immUnbindProgram();

  if (U.pie_menu_confirm > 0 &&
      !(block->pie_data.flags & (UI_PIE_INVALID_DIR | UI_PIE_CLICK_STYLE))) {
    const float pie_confirm_radius = U.dpi_fac * (pie_radius_internal + U.pie_menu_confirm);
    const float pie_confirm_external = U.dpi_fac *
                                       (pie_radius_internal + U.pie_menu_confirm + 7.0f);

    const uchar col[4] = {UNPACK3(btheme->tui.wcol_pie_menu.text_sel), 64};
    draw_disk_shaded(angle - range / 2.0f,
                     range,
                     pie_confirm_radius,
                     pie_confirm_external,
                     subd,
                     col,
                     NULL,
                     false);
  }

  GPU_blend(GPU_BLEND_NONE);
  GPU_matrix_pop();
}

const uiWidgetColors *ui_tooltip_get_theme(void)
{
  uiWidgetType *wt = widget_type(UI_WTYPE_TOOLTIP);
  return wt->wcol_theme;
}

/**
 * Generic drawing for background.
 */
static void ui_draw_widget_back_color(uiWidgetTypeEnum type,
                                      bool use_shadow,
                                      const rcti *rect,
                                      const float color[4])
{
  uiWidgetType *wt = widget_type(type);

  if (use_shadow) {
    GPU_blend(GPU_BLEND_ALPHA);
    widget_softshadow(rect, UI_CNR_ALL, 0.25f * U.widget_unit);
    GPU_blend(GPU_BLEND_NONE);
  }

  rcti rect_copy = *rect;
  wt->state(wt, 0, 0, UI_EMBOSS_UNDEFINED);
  if (color) {
    rgba_float_to_uchar(wt->wcol.inner, color);
  }
  wt->draw(&wt->wcol, &rect_copy, 0, UI_CNR_ALL);
}
void ui_draw_widget_menu_back_color(const rcti *rect, bool use_shadow, const float color[4])
{
  ui_draw_widget_back_color(UI_WTYPE_MENU_BACK, use_shadow, rect, color);
}

void ui_draw_widget_menu_back(const rcti *rect, bool use_shadow)
{
  ui_draw_widget_back_color(UI_WTYPE_MENU_BACK, use_shadow, rect, NULL);
}

void ui_draw_tooltip_background(const uiStyle *UNUSED(style), uiBlock *UNUSED(block), rcti *rect)
{
  uiWidgetType *wt = widget_type(UI_WTYPE_TOOLTIP);
  wt->state(wt, 0, 0, UI_EMBOSS_UNDEFINED);
  /* wt->draw ends up using same function to draw the tooltip as menu_back */
  wt->draw(&wt->wcol, rect, 0, 0);
}

/**
 * Helper call to draw a menu item without a button.
 *
 * \param state: The state of the button,
 * typically #UI_ACTIVE, #UI_BUT_DISABLED, #UI_BUT_INACTIVE.
 * \param separator_type: The kind of separator which controls if and how the string is clipped.
 * \param r_xmax: The right hand position of the text, this takes into the icon,
 * padding and text clipping when there is not enough room to display the full text.
 */
void ui_draw_menu_item(const uiFontStyle *fstyle,
                       rcti *rect,
                       const char *name,
                       int iconid,
                       int state,
                       uiMenuItemSeparatorType separator_type,
                       int *r_xmax)
{
  uiWidgetType *wt = widget_type(UI_WTYPE_MENU_ITEM);
  const rcti _rect = *rect;
  const int row_height = BLI_rcti_size_y(rect);
  int max_hint_width = INT_MAX;
  int padding = 0.25f * row_height;
  char *cpoin = NULL;

  wt->state(wt, state, 0, UI_EMBOSS_UNDEFINED);
  wt->draw(&wt->wcol, rect, 0, 0);

  UI_fontstyle_set(fstyle);

  /* text location offset */
  rect->xmin += padding;
  if (iconid) {
    rect->xmin += row_height; /* Use square area for icon. */
  }

  /* cut string in 2 parts? */
  if (separator_type != UI_MENU_ITEM_SEPARATOR_NONE) {
    cpoin = strrchr(name, UI_SEP_CHAR);
    if (cpoin) {
      *cpoin = 0;

      /* need to set this first */
      UI_fontstyle_set(fstyle);

      if (separator_type == UI_MENU_ITEM_SEPARATOR_SHORTCUT) {
        /* Shrink rect to exclude the shortcut string. */
        rect->xmax -= BLF_width(fstyle->uifont_id, cpoin + 1, INT_MAX) + UI_DPI_ICON_SIZE;
      }
      else if (separator_type == UI_MENU_ITEM_SEPARATOR_HINT) {
        /* Determine max-width for the hint string to leave the name string un-clipped (if there's
         * enough space to display it). */

        const int available_width = BLI_rcti_size_x(rect) - padding;
        const int name_width = BLF_width(fstyle->uifont_id, name, INT_MAX);
        const int hint_width = BLF_width(fstyle->uifont_id, cpoin + 1, INT_MAX) + padding;

        if ((name_width + hint_width) > available_width) {
          /* Clipping width for hint string. */
          max_hint_width = available_width * 0.40f;
          /* Clipping xmax for clipping of item name. */
          rect->xmax = (hint_width < max_hint_width) ?
                           (rect->xmax - hint_width) :
                           (rect->xmin + (available_width - max_hint_width));
        }
      }
      else {
        BLI_assert_msg(0, "Unknwon menu item separator type");
      }
    }
  }

  {
    char drawstr[UI_MAX_DRAW_STR];
    const float okwidth = (float)BLI_rcti_size_x(rect);
    const size_t max_len = sizeof(drawstr);
    const float minwidth = (float)(UI_DPI_ICON_SIZE);

    BLI_strncpy(drawstr, name, sizeof(drawstr));
    if (drawstr[0]) {
      UI_text_clip_middle_ex(fstyle, drawstr, okwidth, minwidth, max_len, '\0');
    }

    int xofs = 0, yofs = 0;
    struct ResultBLF info;
    UI_fontstyle_draw_ex(fstyle,
                         rect,
                         drawstr,
                         wt->wcol.text,
                         &(struct uiFontStyleDraw_Params){
                             .align = UI_STYLE_TEXT_LEFT,
                         },
                         BLF_DRAW_STR_DUMMY_MAX,
                         &xofs,
                         &yofs,
                         &info);
    if (r_xmax != NULL) {
      *r_xmax = xofs + info.width;
    }
  }

  /* restore rect, was messed with */
  *rect = _rect;

  if (iconid) {
    float height, aspect;
    const int xs = rect->xmin + 0.2f * UI_UNIT_X;
    const int ys = rect->ymin + 0.1f * BLI_rcti_size_y(rect);

    height = ICON_SIZE_FROM_BUTRECT(rect);
    aspect = ICON_DEFAULT_HEIGHT / height;

    GPU_blend(GPU_BLEND_ALPHA);
    /* XXX scale weak get from fstyle? */
    UI_icon_draw_ex(xs, ys, iconid, aspect, 1.0f, 0.0f, wt->wcol.text, false);
    GPU_blend(GPU_BLEND_NONE);
  }

  /* part text right aligned */
  if (separator_type != UI_MENU_ITEM_SEPARATOR_NONE) {
    if (cpoin) {
      /* Set inactive state for grayed out text. */
      wt->state(wt, state | UI_BUT_INACTIVE, 0, UI_EMBOSS_UNDEFINED);

      char hint_drawstr[UI_MAX_DRAW_STR];
      {
        const size_t max_len = sizeof(hint_drawstr);
        const float minwidth = (float)(UI_DPI_ICON_SIZE);

        BLI_strncpy(hint_drawstr, cpoin + 1, sizeof(hint_drawstr));
        if (hint_drawstr[0] && (max_hint_width < INT_MAX)) {
          UI_text_clip_middle_ex(fstyle, hint_drawstr, max_hint_width, minwidth, max_len, '\0');
        }
      }

      rect->xmax = _rect.xmax - 5;
      UI_fontstyle_draw(fstyle,
                        rect,
                        hint_drawstr,
                        wt->wcol.text,
                        &(struct uiFontStyleDraw_Params){
                            .align = UI_STYLE_TEXT_RIGHT,
                        });
      *cpoin = UI_SEP_CHAR;
    }
  }
}

/**
 * Version of #ui_draw_preview_item() that does not draw the menu background and item text based on
 * state. It just draws the preview and text directly.
 */
void ui_draw_preview_item_stateless(const uiFontStyle *fstyle,
                                    rcti *rect,
                                    const char *name,
                                    int iconid,
                                    const uchar text_col[4],
                                    eFontStyle_Align text_align)
{
  rcti trect = *rect;
  const float text_size = UI_UNIT_Y;
  float font_dims[2] = {0.0f, 0.0f};
  const bool has_text = name && name[0];

  if (has_text) {
    /* draw icon in rect above the space reserved for the label */
    rect->ymin += text_size;
  }
  GPU_blend(GPU_BLEND_ALPHA);
  widget_draw_preview(iconid, 1.0f, rect);
  GPU_blend(GPU_BLEND_NONE);

  if (!has_text) {
    return;
  }

  BLF_width_and_height(
      fstyle->uifont_id, name, BLF_DRAW_STR_DUMMY_MAX, &font_dims[0], &font_dims[1]);

  /* text rect */
  trect.ymin += U.widget_unit / 2;
  trect.ymax = trect.ymin + font_dims[1];
  if (trect.xmax > rect->xmax - PREVIEW_PAD) {
    trect.xmax = rect->xmax - PREVIEW_PAD;
  }

  {
    char drawstr[UI_MAX_DRAW_STR];
    const float okwidth = (float)BLI_rcti_size_x(&trect);
    const size_t max_len = sizeof(drawstr);
    const float minwidth = (float)(UI_DPI_ICON_SIZE);

    BLI_strncpy(drawstr, name, sizeof(drawstr));
    UI_text_clip_middle_ex(fstyle, drawstr, okwidth, minwidth, max_len, '\0');

    UI_fontstyle_draw(fstyle,
                      &trect,
                      drawstr,
                      text_col,
                      &(struct uiFontStyleDraw_Params){
                          .align = text_align,
                      });
  }
}

void ui_draw_preview_item(const uiFontStyle *fstyle,
                          rcti *rect,
                          const char *name,
                          int iconid,
                          int state,
                          eFontStyle_Align text_align)
{
  uiWidgetType *wt = widget_type(UI_WTYPE_MENU_ITEM);

  /* drawing button background */
  wt->state(wt, state, 0, UI_EMBOSS_UNDEFINED);
  wt->draw(&wt->wcol, rect, 0, 0);

  ui_draw_preview_item_stateless(fstyle, rect, name, iconid, wt->wcol.text, text_align);
}

/** \} */