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|
/*
* ***** BEGIN GPL LICENSE BLOCK *****
*
* 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) 2008, Blender Foundation, Joshua Leung
* This is a new part of Blender
*
* Contributor(s): Joshua Leung, Antonio Vazquez
*
* ***** END GPL LICENSE BLOCK *****
*/
/** \file blender/editors/gpencil/gpencil_paint.c
* \ingroup edgpencil
*/
#include <stdio.h>
#include <stddef.h>
#include <stdlib.h>
#include <string.h>
#include <math.h>
#include "MEM_guardedalloc.h"
#include "BLI_blenlib.h"
#include "BLI_math.h"
#include "BLI_utildefines.h"
#include "BLI_rand.h"
#include "BLI_math_geom.h"
#include "BLT_translation.h"
#include "PIL_time.h"
#include "DNA_meshdata_types.h"
#include "DNA_object_types.h"
#include "DNA_scene_types.h"
#include "DNA_gpencil_types.h"
#include "DNA_material_types.h"
#include "DNA_brush_types.h"
#include "DNA_windowmanager_types.h"
#include "BKE_colortools.h"
#include "BKE_main.h"
#include "BKE_brush.h"
#include "BKE_paint.h"
#include "BKE_context.h"
#include "BKE_deform.h"
#include "BKE_global.h"
#include "BKE_gpencil.h"
#include "BKE_report.h"
#include "BKE_layer.h"
#include "BKE_material.h"
#include "BKE_screen.h"
#include "BKE_tracking.h"
#include "UI_view2d.h"
#include "ED_gpencil.h"
#include "ED_screen.h"
#include "ED_object.h"
#include "ED_view3d.h"
#include "ED_clip.h"
#include "BIF_glutil.h"
#include "GPU_immediate.h"
#include "GPU_immediate_util.h"
#include "GPU_state.h"
#include "RNA_access.h"
#include "RNA_define.h"
#include "WM_api.h"
#include "WM_types.h"
#include "DEG_depsgraph.h"
#include "DEG_depsgraph_query.h"
#include "gpencil_intern.h"
/* ******************************************* */
/* 'Globals' and Defines */
/* values for tGPsdata->status */
typedef enum eGPencil_PaintStatus {
GP_STATUS_IDLING = 0, /* stroke isn't in progress yet */
GP_STATUS_PAINTING, /* a stroke is in progress */
GP_STATUS_ERROR, /* something wasn't correctly set up */
GP_STATUS_DONE /* painting done */
} eGPencil_PaintStatus;
/* Return flags for adding points to stroke buffer */
typedef enum eGP_StrokeAdd_Result {
GP_STROKEADD_INVALID = -2, /* error occurred - insufficient info to do so */
GP_STROKEADD_OVERFLOW = -1, /* error occurred - cannot fit any more points */
GP_STROKEADD_NORMAL, /* point was successfully added */
GP_STROKEADD_FULL /* cannot add any more points to buffer */
} eGP_StrokeAdd_Result;
/* Runtime flags */
typedef enum eGPencil_PaintFlags {
GP_PAINTFLAG_FIRSTRUN = (1 << 0), /* operator just started */
GP_PAINTFLAG_STROKEADDED = (1 << 1),
GP_PAINTFLAG_V3D_ERASER_DEPTH = (1 << 2),
GP_PAINTFLAG_SELECTMASK = (1 << 3),
GP_PAINTFLAG_HARD_ERASER = (1 << 4),
GP_PAINTFLAG_STROKE_ERASER = (1 << 5),
} eGPencil_PaintFlags;
/* Temporary 'Stroke' Operation data
* "p" = op->customdata
*/
typedef struct tGPsdata {
bContext *C;
Main *bmain; /* main database pointer */
Scene *scene; /* current scene from context */
struct Depsgraph *depsgraph;
Object *ob; /* current object */
wmWindow *win; /* window where painting originated */
ScrArea *sa; /* area where painting originated */
ARegion *ar; /* region where painting originated */
View2D *v2d; /* needed for GP_STROKE_2DSPACE */
rctf *subrect; /* for using the camera rect within the 3d view */
rctf subrect_data;
GP_SpaceConversion gsc; /* settings to pass to gp_points_to_xy() */
PointerRNA ownerPtr; /* pointer to owner of gp-datablock */
bGPdata *gpd; /* gp-datablock layer comes from */
bGPDlayer *gpl; /* layer we're working on */
bGPDframe *gpf; /* frame we're working on */
char *align_flag; /* projection-mode flags (toolsettings - eGPencil_Placement_Flags) */
eGPencil_PaintStatus status; /* current status of painting */
eGPencil_PaintModes paintmode; /* mode for painting */
eGPencil_PaintFlags flags; /* flags that can get set during runtime (eGPencil_PaintFlags) */
short radius; /* radius of influence for eraser */
int mval[2]; /* current mouse-position */
int mvalo[2]; /* previous recorded mouse-position */
float pressure; /* current stylus pressure */
float opressure; /* previous stylus pressure */
/* These need to be doubles, as (at least under unix) they are in seconds since epoch,
* float (and its 7 digits precision) is definitively not enough here!
* double, with its 15 digits precision, ensures us millisecond precision for a few centuries at least.
*/
double inittime; /* Used when converting to path */
double curtime; /* Used when converting to path */
double ocurtime; /* Used when converting to path */
float imat[4][4]; /* inverted transformation matrix applying when converting coords from screen-space
* to region space */
float mat[4][4];
float custom_color[4]; /* custom color - hack for enforcing a particular color for track/mask editing */
void *erasercursor; /* radial cursor data for drawing eraser */
/* mat settings are only used for 3D view */
Material *material; /* current material */
Brush *brush; /* current drawing brush */
Brush *eraser; /* default eraser brush */
short straight[2]; /* 1: line horizontal, 2: line vertical, other: not defined, second element position */
int lock_axis; /* lock drawing to one axis */
bool disable_fill; /* the stroke is no fill mode */
RNG *rng;
short keymodifier; /* key used for invoking the operator */
short shift; /* shift modifier flag */
float totpixlen; /* size in pixels for uv calculation */
ReportList *reports;
} tGPsdata;
/* ------ */
/* Macros for accessing sensitivity thresholds... */
/* minimum number of pixels mouse should move before new point created */
#define MIN_MANHATTEN_PX (U.gp_manhattendist)
/* minimum length of new segment before new point can be added */
#define MIN_EUCLIDEAN_PX (U.gp_euclideandist)
static void gp_update_cache(bGPdata *gpd)
{
if (gpd) {
DEG_id_tag_update(&gpd->id, OB_RECALC_OB | OB_RECALC_DATA);
gpd->flag |= GP_DATA_CACHE_IS_DIRTY;
}
}
static bool gp_stroke_added_check(tGPsdata *p)
{
return (p->gpf && p->gpf->strokes.last && p->flags & GP_PAINTFLAG_STROKEADDED);
}
static void gp_stroke_added_enable(tGPsdata *p)
{
BLI_assert(p->gpf->strokes.last != NULL);
p->flags |= GP_PAINTFLAG_STROKEADDED;
/* drawing batch cache is dirty now */
gp_update_cache(p->gpd);
}
/* ------ */
/* Forward defines for some functions... */
static void gp_session_validatebuffer(tGPsdata *p);
/* ******************************************* */
/* Context Wrangling... */
/* check if context is suitable for drawing */
static bool gpencil_draw_poll(bContext *C)
{
if (ED_operator_regionactive(C)) {
ScrArea *sa = CTX_wm_area(C);
if (!ELEM(sa->spacetype, SPACE_VIEW3D)) {
/* check if current context can support GPencil data */
if (ED_gpencil_data_get_pointers(C, NULL) != NULL) {
/* check if Grease Pencil isn't already running */
if (ED_gpencil_session_active() == 0)
return 1;
else
CTX_wm_operator_poll_msg_set(C, "Grease Pencil operator is already active");
}
else {
CTX_wm_operator_poll_msg_set(C, "Failed to find Grease Pencil data to draw into");
}
return 0;
}
/* 3D Viewport */
else {
if (ED_gpencil_session_active() == 0) {
return 1;
}
else {
return 0;
}
}
}
else {
CTX_wm_operator_poll_msg_set(C, "Active region not set");
return 0;
}
}
/* check if projecting strokes into 3d-geometry in the 3D-View */
static bool gpencil_project_check(tGPsdata *p)
{
bGPdata *gpd = p->gpd;
return ((gpd->runtime.sbuffer_sflag & GP_STROKE_3DSPACE) && (*p->align_flag & (GP_PROJECT_DEPTH_VIEW | GP_PROJECT_DEPTH_STROKE)));
}
/* ******************************************* */
/* Calculations/Conversions */
/* Utilities --------------------------------- */
/* get the reference point for stroke-point conversions */
static void gp_get_3d_reference(tGPsdata *p, float vec[3])
{
View3D *v3d = p->sa->spacedata.first;
Object *ob = NULL;
if (p->ownerPtr.type == &RNA_Object) {
ob = (Object *)p->ownerPtr.data;
}
ED_gp_get_drawing_reference(v3d, p->scene, ob, p->gpl, *p->align_flag, vec);
}
/* Stroke Editing ---------------------------- */
/* check if the current mouse position is suitable for adding a new point */
static bool gp_stroke_filtermval(tGPsdata *p, const int mval[2], int pmval[2])
{
Brush *brush = p->brush;
int dx = abs(mval[0] - pmval[0]);
int dy = abs(mval[1] - pmval[1]);
brush->gpencil_settings->flag &= ~GP_BRUSH_STABILIZE_MOUSE_TEMP;
/* if buffer is empty, just let this go through (i.e. so that dots will work) */
if (p->gpd->runtime.sbuffer_size == 0) {
return true;
}
/* if lazy mouse, check minimum distance */
else if (GPENCIL_LAZY_MODE(brush, p->shift)) {
brush->gpencil_settings->flag |= GP_BRUSH_STABILIZE_MOUSE_TEMP;
if ((dx * dx + dy * dy) > (brush->smooth_stroke_radius * brush->smooth_stroke_radius)) {
return true;
}
else {
/* If the mouse is moving within the radius of the last move,
* don't update the mouse position. This allows sharp turns. */
copy_v2_v2_int(p->mval, p->mvalo);
return false;
}
}
/* check if mouse moved at least certain distance on both axes (best case)
* - aims to eliminate some jitter-noise from input when trying to draw straight lines freehand
*/
else if ((dx > MIN_MANHATTEN_PX) && (dy > MIN_MANHATTEN_PX))
return true;
/* check if the distance since the last point is significant enough
* - prevents points being added too densely
* - distance here doesn't use sqrt to prevent slowness... we should still be safe from overflows though
*/
else if ((dx * dx + dy * dy) > MIN_EUCLIDEAN_PX * MIN_EUCLIDEAN_PX)
return true;
/* mouse 'didn't move' */
else
return false;
}
/* reproject stroke to plane locked to axis in 3d cursor location */
static void gp_reproject_toplane(tGPsdata *p, bGPDstroke *gps)
{
bGPdata *gpd = p->gpd;
Object *obact = (Object *)p->ownerPtr.data;
float origin[3];
RegionView3D *rv3d = p->ar->regiondata;
/* verify the stroke mode is CURSOR 3d space mode */
if ((gpd->runtime.sbuffer_sflag & GP_STROKE_3DSPACE) == 0) {
return;
}
if ((*p->align_flag & GP_PROJECT_VIEWSPACE) == 0) {
return;
}
if ((*p->align_flag & GP_PROJECT_DEPTH_VIEW) || (*p->align_flag & GP_PROJECT_DEPTH_STROKE)) {
return;
}
/* get drawing origin */
gp_get_3d_reference(p, origin);
ED_gp_project_stroke_to_plane(obact, rv3d, gps, origin, p->lock_axis - 1);
}
/* convert screen-coordinates to buffer-coordinates */
/* XXX this method needs a total overhaul! */
static void gp_stroke_convertcoords(tGPsdata *p, const int mval[2], float out[3], float *depth)
{
bGPdata *gpd = p->gpd;
/* in 3d-space - pt->x/y/z are 3 side-by-side floats */
if (gpd->runtime.sbuffer_sflag & GP_STROKE_3DSPACE) {
/* add small offset to keep stroke over the surface.
* This could be a UI parameter, but the value is too sensitive for
* the user to use it and don't improve the result.
*/
if (depth) {
*depth *= 0.99998f;
}
if (gpencil_project_check(p) && (ED_view3d_autodist_simple(p->ar, mval, out, 0, depth))) {
/* projecting onto 3D-Geometry
* - nothing more needs to be done here, since view_autodist_simple() has already done it
*/
/* verify valid zdepth, if it's wrong, the default darwing mode is used
* and the function doesn't return now */
if ((depth == NULL) || (*depth <= 1.0f)) {
return;
}
}
float mval_prj[2];
float rvec[3], dvec[3];
float mval_f[2];
copy_v2fl_v2i(mval_f, mval);
float zfac;
/* Current method just converts each point in screen-coordinates to
* 3D-coordinates using the 3D-cursor as reference. In general, this
* works OK, but it could of course be improved.
*
* TODO:
* - investigate using nearest point(s) on a previous stroke as
* reference point instead or as offset, for easier stroke matching
*/
gp_get_3d_reference(p, rvec);
zfac = ED_view3d_calc_zfac(p->ar->regiondata, rvec, NULL);
if (ED_view3d_project_float_global(p->ar, rvec, mval_prj, V3D_PROJ_TEST_NOP) == V3D_PROJ_RET_OK) {
sub_v2_v2v2(mval_f, mval_prj, mval_f);
ED_view3d_win_to_delta(p->ar, mval_f, dvec, zfac);
sub_v3_v3v3(out, rvec, dvec);
}
else {
zero_v3(out);
}
}
}
/* apply jitter to stroke */
static void gp_brush_jitter(
bGPdata *gpd, Brush *brush, tGPspoint *pt, const int mval[2],
const float pressure, int r_mval[2], RNG *rng)
{
float tmp_pressure = pressure;
if (brush->gpencil_settings->draw_jitter > 0.0f) {
float curvef = curvemapping_evaluateF(brush->gpencil_settings->curve_jitter, 0, pressure);
tmp_pressure = curvef * brush->gpencil_settings->draw_sensitivity;
}
const float exfactor = (brush->gpencil_settings->draw_jitter + 2.0f) * (brush->gpencil_settings->draw_jitter + 2.0f); /* exponential value */
const float fac = BLI_rng_get_float(rng) * exfactor * tmp_pressure;
/* Jitter is applied perpendicular to the mouse movement vector (2D space) */
float mvec[2], svec[2];
/* mouse movement in ints -> floats */
if (gpd->runtime.sbuffer_size > 1) {
mvec[0] = (float)(mval[0] - (pt - 1)->x);
mvec[1] = (float)(mval[1] - (pt - 1)->y);
normalize_v2(mvec);
}
else {
mvec[0] = 0.0f;
mvec[1] = 0.0f;
}
/* rotate mvec by 90 degrees... */
svec[0] = -mvec[1];
svec[1] = mvec[0];
/* scale the displacement by the random, and apply */
if (BLI_rng_get_float(rng) > 0.5f) {
mul_v2_fl(svec, -fac);
}
else {
mul_v2_fl(svec, fac);
}
r_mval[0] = mval[0] + svec[0];
r_mval[1] = mval[1] + svec[1];
}
/* apply pressure change depending of the angle of the stroke to simulate a pen with shape */
static void gp_brush_angle(bGPdata *gpd, Brush *brush, tGPspoint *pt, const int mval[2])
{
float mvec[2];
float sen = brush->gpencil_settings->draw_angle_factor; /* sensitivity */;
float fac;
float mpressure;
float angle = brush->gpencil_settings->draw_angle; /* default angle of brush in radians */;
float v0[2] = { cos(angle), sin(angle) }; /* angle vector of the brush with full thickness */
/* Apply to first point (only if there are 2 points because before no data to do it ) */
if (gpd->runtime.sbuffer_size == 1) {
mvec[0] = (float)(mval[0] - (pt - 1)->x);
mvec[1] = (float)(mval[1] - (pt - 1)->y);
normalize_v2(mvec);
/* uses > 1.0f to get a smooth transition in first point */
fac = 1.4f - fabs(dot_v2v2(v0, mvec)); /* 0.0 to 1.0 */
(pt - 1)->pressure = (pt - 1)->pressure - (sen * fac);
CLAMP((pt - 1)->pressure, GPENCIL_ALPHA_OPACITY_THRESH, 1.0f);
}
/* apply from second point */
if (gpd->runtime.sbuffer_size >= 1) {
mvec[0] = (float)(mval[0] - (pt - 1)->x);
mvec[1] = (float)(mval[1] - (pt - 1)->y);
normalize_v2(mvec);
fac = 1.0f - fabs(dot_v2v2(v0, mvec)); /* 0.0 to 1.0 */
/* interpolate with previous point for smoother transitions */
mpressure = interpf(pt->pressure - (sen * fac), (pt - 1)->pressure, 0.3f);
pt->pressure = mpressure;
CLAMP(pt->pressure, GPENCIL_ALPHA_OPACITY_THRESH, 1.0f);
}
}
/* Apply smooth to buffer while drawing
* to smooth point C, use 2 before (A, B) and current point (D):
*
* A----B-----C------D
*
* \param p Temp data
* \param inf Influence factor
* \param idx Index of the last point (need minimum 3 points in the array)
*/
static void gp_smooth_buffer(tGPsdata *p, float inf, int idx)
{
bGPdata *gpd = p->gpd;
short num_points = gpd->runtime.sbuffer_size;
/* Do nothing if not enough points to smooth out */
if ((num_points < 3) || (idx < 3) || (inf == 0.0f)) {
return;
}
tGPspoint *points = (tGPspoint *)gpd->runtime.sbuffer;
float steps = 4.0f;
if (idx < 4) {
steps--;
}
tGPspoint *pta = idx >= 4 ? &points[idx - 4] : NULL;
tGPspoint *ptb = idx >= 3 ? &points[idx - 3] : NULL;
tGPspoint *ptc = idx >= 2 ? &points[idx - 2] : NULL;
tGPspoint *ptd = &points[idx - 1];
float sco[2] = { 0.0f };
float a[2], b[2], c[2], d[2];
const float average_fac = 1.0f / steps;
/* Compute smoothed coordinate by taking the ones nearby */
if (pta) {
copy_v2fl_v2i(a, &pta->x);
madd_v2_v2fl(sco, a, average_fac);
}
if (ptb) {
copy_v2fl_v2i(b, &ptb->x);
madd_v2_v2fl(sco, b, average_fac);
}
if (ptc) {
copy_v2fl_v2i(c, &ptc->x);
madd_v2_v2fl(sco, c, average_fac);
}
if (ptd) {
copy_v2fl_v2i(d, &ptd->x);
madd_v2_v2fl(sco, d, average_fac);
}
/* Based on influence factor, blend between original and optimal smoothed coordinate */
interp_v2_v2v2(c, c, sco, inf);
round_v2i_v2fl(&ptc->x, c);
}
/* add current stroke-point to buffer (returns whether point was successfully added) */
static short gp_stroke_addpoint(
tGPsdata *p, const int mval[2], float pressure, double curtime)
{
bGPdata *gpd = p->gpd;
Brush *brush = p->brush;
tGPspoint *pt;
ToolSettings *ts = p->scene->toolsettings;
Object *obact = (Object *)p->ownerPtr.data;
Depsgraph *depsgraph = p->depsgraph; \
RegionView3D *rv3d = p->ar->regiondata;
View3D *v3d = p->sa->spacedata.first;
MaterialGPencilStyle *gp_style = p->material->gp_style;
const int def_nr = obact->actdef - 1;
const bool have_weight = (bool)BLI_findlink(&obact->defbase, def_nr);
/* check painting mode */
if (p->paintmode == GP_PAINTMODE_DRAW_STRAIGHT) {
/* straight lines only - i.e. only store start and end point in buffer */
if (gpd->runtime.sbuffer_size == 0) {
/* first point in buffer (start point) */
pt = (tGPspoint *)(gpd->runtime.sbuffer);
/* store settings */
copy_v2_v2_int(&pt->x, mval);
pt->pressure = 1.0f; /* T44932 - Pressure vals are unreliable, so ignore for now */
pt->strength = 1.0f;
pt->time = (float)(curtime - p->inittime);
/* increment buffer size */
gpd->runtime.sbuffer_size++;
}
else {
/* just reset the endpoint to the latest value
* - assume that pointers for this are always valid...
*/
pt = ((tGPspoint *)(gpd->runtime.sbuffer) + 1);
/* store settings */
copy_v2_v2_int(&pt->x, mval);
pt->pressure = 1.0f; /* T44932 - Pressure vals are unreliable, so ignore for now */
pt->strength = 1.0f;
pt->time = (float)(curtime - p->inittime);
/* now the buffer has 2 points (and shouldn't be allowed to get any larger) */
gpd->runtime.sbuffer_size = 2;
}
/* can keep carrying on this way :) */
return GP_STROKEADD_NORMAL;
}
else if (p->paintmode == GP_PAINTMODE_DRAW) { /* normal drawing */
/* check if still room in buffer */
if (gpd->runtime.sbuffer_size >= GP_STROKE_BUFFER_MAX)
return GP_STROKEADD_OVERFLOW;
/* get pointer to destination point */
pt = ((tGPspoint *)(gpd->runtime.sbuffer) + gpd->runtime.sbuffer_size);
/* store settings */
/* pressure */
if (brush->gpencil_settings->flag & GP_BRUSH_USE_PRESSURE) {
float curvef = curvemapping_evaluateF(brush->gpencil_settings->curve_sensitivity, 0, pressure);
pt->pressure = curvef * brush->gpencil_settings->draw_sensitivity;
}
else {
pt->pressure = 1.0f;
}
/* Apply jitter to position */
if ((brush->gpencil_settings->flag & GP_BRUSH_GROUP_RANDOM) &&
(brush->gpencil_settings->draw_jitter > 0.0f))
{
int r_mval[2];
const float jitpress = (brush->gpencil_settings->flag & GP_BRUSH_USE_JITTER_PRESSURE) ? pressure : 1.0f;
gp_brush_jitter(gpd, brush, pt, mval, jitpress, r_mval, p->rng);
copy_v2_v2_int(&pt->x, r_mval);
}
else {
copy_v2_v2_int(&pt->x, mval);
}
/* apply randomness to pressure */
if ((brush->gpencil_settings->flag & GP_BRUSH_GROUP_RANDOM) &&
(brush->gpencil_settings->draw_random_press > 0.0f))
{
float curvef = curvemapping_evaluateF(brush->gpencil_settings->curve_sensitivity, 0, pressure);
float tmp_pressure = curvef * brush->gpencil_settings->draw_sensitivity;
if (BLI_rng_get_float(p->rng) > 0.5f) {
pt->pressure -= tmp_pressure * brush->gpencil_settings->draw_random_press * BLI_rng_get_float(p->rng);
}
else {
pt->pressure += tmp_pressure * brush->gpencil_settings->draw_random_press * BLI_rng_get_float(p->rng);
}
CLAMP(pt->pressure, GPENCIL_STRENGTH_MIN, 1.0f);
}
/* apply randomness to uv texture rotation */
if ((brush->gpencil_settings->flag & GP_BRUSH_GROUP_RANDOM) && (brush->gpencil_settings->uv_random > 0.0f)) {
if (BLI_rng_get_float(p->rng) > 0.5f) {
pt->uv_rot = (BLI_rng_get_float(p->rng) * M_PI * -1) * brush->gpencil_settings->uv_random;
}
else {
pt->uv_rot = (BLI_rng_get_float(p->rng) * M_PI) * brush->gpencil_settings->uv_random;
}
CLAMP(pt->uv_rot, -M_PI_2, M_PI_2);
}
else {
pt->uv_rot = 0.0f;
}
/* apply angle of stroke to brush size */
if (brush->gpencil_settings->draw_angle_factor != 0.0f)
{
gp_brush_angle(gpd, brush, pt, mval);
}
/* color strength */
if (brush->gpencil_settings->flag & GP_BRUSH_USE_STENGTH_PRESSURE) {
float curvef = curvemapping_evaluateF(brush->gpencil_settings->curve_strength, 0, pressure);
float tmp_pressure = curvef * brush->gpencil_settings->draw_sensitivity;
pt->strength = tmp_pressure * brush->gpencil_settings->draw_strength;
}
else {
pt->strength = brush->gpencil_settings->draw_strength;
}
CLAMP(pt->strength, GPENCIL_STRENGTH_MIN, 1.0f);
/* apply randomness to color strength */
if ((brush->gpencil_settings->flag & GP_BRUSH_GROUP_RANDOM) &&
(brush->gpencil_settings->draw_random_strength > 0.0f))
{
if (BLI_rng_get_float(p->rng) > 0.5f) {
pt->strength -= pt->strength * brush->gpencil_settings->draw_random_strength * BLI_rng_get_float(p->rng);
}
else {
pt->strength += pt->strength * brush->gpencil_settings->draw_random_strength * BLI_rng_get_float(p->rng);
}
CLAMP(pt->strength, GPENCIL_STRENGTH_MIN, 1.0f);
}
/* point time */
pt->time = (float)(curtime - p->inittime);
/* point uv (only 3d view) */
if ((p->sa->spacetype == SPACE_VIEW3D) && (gpd->runtime.sbuffer_size > 1)) {
float pixsize = gp_style->texture_pixsize / 1000000.0f;
tGPspoint *ptb = (tGPspoint *)gpd->runtime.sbuffer + gpd->runtime.sbuffer_size - 2;
bGPDspoint spt, spt2;
/* get origin to reproject point */
float origin[3];
gp_get_3d_reference(p, origin);
/* reproject current */
ED_gpencil_tpoint_to_point(p->ar, origin, pt, &spt);
ED_gp_project_point_to_plane(obact, rv3d, origin, ts->gp_sculpt.lock_axis - 1, &spt);
/* reproject previous */
ED_gpencil_tpoint_to_point(p->ar, origin, ptb, &spt2);
ED_gp_project_point_to_plane(obact, rv3d, origin, ts->gp_sculpt.lock_axis - 1, &spt2);
p->totpixlen += len_v3v3(&spt.x, &spt2.x) / pixsize;
pt->uv_fac = p->totpixlen;
if ((gp_style) && (gp_style->sima)) {
pt->uv_fac /= gp_style->sima->gen_x;
}
}
else {
p->totpixlen = 0.0f;
pt->uv_fac = 0.0f;
}
/* increment counters */
gpd->runtime.sbuffer_size++;
/* smooth while drawing previous points with a reduction factor for previous */
if (brush->gpencil_settings->active_smooth > 0.0f) {
for (int s = 0; s < 3; s++) {
gp_smooth_buffer(p, brush->gpencil_settings->active_smooth * ((3.0f - s) / 3.0f), gpd->runtime.sbuffer_size - s);
}
}
/* check if another operation can still occur */
if (gpd->runtime.sbuffer_size == GP_STROKE_BUFFER_MAX)
return GP_STROKEADD_FULL;
else
return GP_STROKEADD_NORMAL;
}
else if (p->paintmode == GP_PAINTMODE_DRAW_POLY) {
/* enable special flag for drawing engine */
gpd->flag |= GP_DATA_STROKE_POLYGON;
bGPDlayer *gpl = BKE_gpencil_layer_getactive(gpd);
/* get pointer to destination point */
pt = (tGPspoint *)(gpd->runtime.sbuffer);
/* store settings */
copy_v2_v2_int(&pt->x, mval);
pt->pressure = 1.0f; /* T44932 - Pressure vals are unreliable, so ignore for now */
pt->strength = 1.0f;
pt->time = (float)(curtime - p->inittime);
/* if there's stroke for this poly line session add (or replace last) point
* to stroke. This allows to draw lines more interactively (see new segment
* during mouse slide, e.g.)
*/
if (gp_stroke_added_check(p)) {
bGPDstroke *gps = p->gpf->strokes.last;
bGPDspoint *pts;
MDeformVert *dvert = NULL;
/* first time point is adding to temporary buffer -- need to allocate new point in stroke */
if (gpd->runtime.sbuffer_size == 0) {
gps->points = MEM_reallocN(gps->points, sizeof(bGPDspoint) * (gps->totpoints + 1));
if (gps->dvert != NULL) {
gps->dvert = MEM_reallocN(gps->dvert, sizeof(MDeformVert) * (gps->totpoints + 1));
}
gps->totpoints++;
}
pts = &gps->points[gps->totpoints - 1];
if (gps->dvert != NULL) {
dvert = &gps->dvert[gps->totpoints - 1];
}
/* special case for poly lines: normally,
* depth is needed only when creating new stroke from buffer,
* but poly lines are converting to stroke instantly,
* so initialize depth buffer before converting coordinates
*/
if (gpencil_project_check(p)) {
view3d_region_operator_needs_opengl(p->win, p->ar);
ED_view3d_autodist_init(
p->depsgraph, p->ar, v3d, (ts->gpencil_v3d_align & GP_PROJECT_DEPTH_STROKE) ? 1 : 0);
}
/* convert screen-coordinates to appropriate coordinates (and store them) */
gp_stroke_convertcoords(p, &pt->x, &pts->x, NULL);
/* reproject to plane (only in 3d space) */
gp_reproject_toplane(p, gps);
/* if parented change position relative to parent object */
gp_apply_parent_point(depsgraph, obact, gpd, gpl, pts);
/* copy pressure and time */
pts->pressure = pt->pressure;
pts->strength = pt->strength;
pts->time = pt->time;
pts->uv_fac = pt->uv_fac;
pts->uv_rot = pt->uv_rot;
if ((ts->gpencil_flags & GP_TOOL_FLAG_CREATE_WEIGHTS) && (have_weight)) {
BKE_gpencil_dvert_ensure(gps);
MDeformWeight *dw = defvert_verify_index(dvert, def_nr);
if (dw) {
dw->weight = ts->vgroup_weight;
}
}
else {
if (dvert != NULL) {
dvert->totweight = 0;
dvert->dw = NULL;
}
}
/* force fill recalc */
gps->flag |= GP_STROKE_RECALC_CACHES;
/* drawing batch cache is dirty now */
gp_update_cache(p->gpd);
}
/* increment counters */
if (gpd->runtime.sbuffer_size == 0)
gpd->runtime.sbuffer_size++;
return GP_STROKEADD_NORMAL;
}
/* return invalid state for now... */
return GP_STROKEADD_INVALID;
}
/* simplify a stroke (in buffer) before storing it
* - applies a reverse Chaikin filter
* - code adapted from etch-a-ton branch
*/
static void gp_stroke_simplify(tGPsdata *p)
{
bGPdata *gpd = p->gpd;
tGPspoint *old_points = (tGPspoint *)gpd->runtime.sbuffer;
short num_points = gpd->runtime.sbuffer_size;
short flag = gpd->runtime.sbuffer_sflag;
short i, j;
/* only simplify if simplification is enabled, and we're not doing a straight line */
if (!(U.gp_settings & GP_PAINT_DOSIMPLIFY) || (p->paintmode == GP_PAINTMODE_DRAW_STRAIGHT))
return;
/* don't simplify if less than 4 points in buffer */
if ((num_points <= 4) || (old_points == NULL))
return;
/* clear buffer (but don't free mem yet) so that we can write to it
* - firstly set sbuffer to NULL, so a new one is allocated
* - secondly, reset flag after, as it gets cleared auto
*/
gpd->runtime.sbuffer = NULL;
gp_session_validatebuffer(p);
gpd->runtime.sbuffer_sflag = flag;
/* macro used in loop to get position of new point
* - used due to the mixture of datatypes in use here
*/
#define GP_SIMPLIFY_AVPOINT(offs, sfac) \
{ \
co[0] += (float)(old_points[offs].x * sfac); \
co[1] += (float)(old_points[offs].y * sfac); \
pressure += old_points[offs].pressure * sfac; \
time += old_points[offs].time * sfac; \
} (void)0
/* XXX Here too, do not lose start and end points! */
gp_stroke_addpoint(p, &old_points->x, old_points->pressure, p->inittime + (double)old_points->time);
for (i = 0, j = 0; i < num_points; i++) {
if (i - j == 3) {
float co[2], pressure, time;
int mco[2];
/* initialize values */
co[0] = 0.0f;
co[1] = 0.0f;
pressure = 0.0f;
time = 0.0f;
/* using macro, calculate new point */
GP_SIMPLIFY_AVPOINT(j, -0.25f);
GP_SIMPLIFY_AVPOINT(j + 1, 0.75f);
GP_SIMPLIFY_AVPOINT(j + 2, 0.75f);
GP_SIMPLIFY_AVPOINT(j + 3, -0.25f);
/* set values for adding */
mco[0] = (int)co[0];
mco[1] = (int)co[1];
/* ignore return values on this... assume to be ok for now */
gp_stroke_addpoint(p, mco, pressure, p->inittime + (double)time);
j += 2;
}
}
gp_stroke_addpoint(p, &old_points[num_points - 1].x, old_points[num_points - 1].pressure,
p->inittime + (double)old_points[num_points - 1].time);
/* free old buffer */
MEM_freeN(old_points);
}
/* make a new stroke from the buffer data */
static void gp_stroke_newfrombuffer(tGPsdata *p)
{
bGPdata *gpd = p->gpd;
bGPDlayer *gpl = p->gpl;
bGPDstroke *gps;
bGPDspoint *pt;
tGPspoint *ptc;
MDeformVert *dvert = NULL;
Brush *brush = p->brush;
ToolSettings *ts = p->scene->toolsettings;
Depsgraph *depsgraph = p->depsgraph;
Object *obact = (Object *)p->ownerPtr.data;
const int def_nr = obact->actdef - 1;
const bool have_weight = (bool)BLI_findlink(&obact->defbase, def_nr);
int i, totelem;
/* since strokes are so fine, when using their depth we need a margin otherwise they might get missed */
int depth_margin = (ts->gpencil_v3d_align & GP_PROJECT_DEPTH_STROKE) ? 4 : 0;
/* get total number of points to allocate space for
* - drawing straight-lines only requires the endpoints
*/
if (p->paintmode == GP_PAINTMODE_DRAW_STRAIGHT)
totelem = (gpd->runtime.sbuffer_size >= 2) ? 2 : gpd->runtime.sbuffer_size;
else
totelem = gpd->runtime.sbuffer_size;
/* exit with error if no valid points from this stroke */
if (totelem == 0) {
if (G.debug & G_DEBUG)
printf("Error: No valid points in stroke buffer to convert (tot=%d)\n", gpd->runtime.sbuffer_size);
return;
}
/* special case for poly line -- for already added stroke during session
* coordinates are getting added to stroke immediately to allow more
* interactive behavior
*/
if (p->paintmode == GP_PAINTMODE_DRAW_POLY) {
/* be sure to hide any lazy cursor */
ED_gpencil_toggle_brush_cursor(p->C, true, NULL);
if (gp_stroke_added_check(p)) {
return;
}
}
/* allocate memory for a new stroke */
gps = MEM_callocN(sizeof(bGPDstroke), "gp_stroke");
/* copy appropriate settings for stroke */
gps->totpoints = totelem;
gps->thickness = brush->size;
gps->flag = gpd->runtime.sbuffer_sflag;
gps->inittime = p->inittime;
/* enable recalculation flag by default (only used if hq fill) */
gps->flag |= GP_STROKE_RECALC_CACHES;
/* allocate enough memory for a continuous array for storage points */
const int subdivide = brush->gpencil_settings->draw_subdivide;
gps->points = MEM_callocN(sizeof(bGPDspoint) * gps->totpoints, "gp_stroke_points");
/* initialize triangle memory to dummy data */
gps->triangles = MEM_callocN(sizeof(bGPDtriangle), "GP Stroke triangulation");
gps->flag |= GP_STROKE_RECALC_CACHES;
gps->tot_triangles = 0;
/* drawing batch cache is dirty now */
gp_update_cache(p->gpd);
/* set pointer to first non-initialized point */
pt = gps->points + (gps->totpoints - totelem);
if (gps->dvert != NULL) {
dvert = gps->dvert + (gps->totpoints - totelem);
}
/* copy points from the buffer to the stroke */
if (p->paintmode == GP_PAINTMODE_DRAW_STRAIGHT) {
/* straight lines only -> only endpoints */
{
/* first point */
ptc = gpd->runtime.sbuffer;
/* convert screen-coordinates to appropriate coordinates (and store them) */
gp_stroke_convertcoords(p, &ptc->x, &pt->x, NULL);
/* copy pressure and time */
pt->pressure = ptc->pressure;
pt->strength = ptc->strength;
CLAMP(pt->strength, GPENCIL_STRENGTH_MIN, 1.0f);
pt->time = ptc->time;
pt++;
if ((ts->gpencil_flags & GP_TOOL_FLAG_CREATE_WEIGHTS) && (have_weight)) {
BKE_gpencil_dvert_ensure(gps);
MDeformWeight *dw = defvert_verify_index(dvert, def_nr);
if (dw) {
dw->weight = ts->vgroup_weight;
}
dvert++;
}
else {
if (dvert != NULL) {
dvert->totweight = 0;
dvert->dw = NULL;
dvert++;
}
}
}
if (totelem == 2) {
/* last point if applicable */
ptc = ((tGPspoint *)gpd->runtime.sbuffer) + (gpd->runtime.sbuffer_size - 1);
/* convert screen-coordinates to appropriate coordinates (and store them) */
gp_stroke_convertcoords(p, &ptc->x, &pt->x, NULL);
/* copy pressure and time */
pt->pressure = ptc->pressure;
pt->strength = ptc->strength;
CLAMP(pt->strength, GPENCIL_STRENGTH_MIN, 1.0f);
pt->time = ptc->time;
if ((ts->gpencil_flags & GP_TOOL_FLAG_CREATE_WEIGHTS) && (have_weight)) {
BKE_gpencil_dvert_ensure(gps);
MDeformWeight *dw = defvert_verify_index(dvert, def_nr);
if (dw) {
dw->weight = ts->vgroup_weight;
}
}
else {
if (dvert != NULL) {
dvert->totweight = 0;
dvert->dw = NULL;
}
}
}
/* reproject to plane (only in 3d space) */
gp_reproject_toplane(p, gps);
pt = gps->points;
for (i = 0; i < gps->totpoints; i++, pt++) {
/* if parented change position relative to parent object */
gp_apply_parent_point(depsgraph, obact, gpd, gpl, pt);
}
}
else if (p->paintmode == GP_PAINTMODE_DRAW_POLY) {
/* first point */
ptc = gpd->runtime.sbuffer;
/* convert screen-coordinates to appropriate coordinates (and store them) */
gp_stroke_convertcoords(p, &ptc->x, &pt->x, NULL);
/* reproject to plane (only in 3d space) */
gp_reproject_toplane(p, gps);
/* if parented change position relative to parent object */
gp_apply_parent_point(depsgraph, obact, gpd, gpl, pt);
/* copy pressure and time */
pt->pressure = ptc->pressure;
pt->strength = ptc->strength;
CLAMP(pt->strength, GPENCIL_STRENGTH_MIN, 1.0f);
pt->time = ptc->time;
if ((ts->gpencil_flags & GP_TOOL_FLAG_CREATE_WEIGHTS) && (have_weight)) {
BKE_gpencil_dvert_ensure(gps);
MDeformWeight *dw = defvert_verify_index(dvert, def_nr);
if (dw) {
dw->weight = ts->vgroup_weight;
}
}
else {
if (dvert != NULL) {
dvert->totweight = 0;
dvert->dw = NULL;
}
}
}
else {
float *depth_arr = NULL;
/* get an array of depths, far depths are blended */
if (gpencil_project_check(p)) {
int mval[2], mval_prev[2] = { 0 };
int interp_depth = 0;
int found_depth = 0;
depth_arr = MEM_mallocN(sizeof(float) * gpd->runtime.sbuffer_size, "depth_points");
for (i = 0, ptc = gpd->runtime.sbuffer; i < gpd->runtime.sbuffer_size; i++, ptc++, pt++) {
copy_v2_v2_int(mval, &ptc->x);
if ((ED_view3d_autodist_depth(p->ar, mval, depth_margin, depth_arr + i) == 0) &&
(i && (ED_view3d_autodist_depth_seg(p->ar, mval, mval_prev, depth_margin + 1, depth_arr + i) == 0)))
{
interp_depth = true;
}
else {
found_depth = true;
}
copy_v2_v2_int(mval_prev, mval);
}
if (found_depth == false) {
/* eeh... not much we can do.. :/, ignore depth in this case, use the 3D cursor */
for (i = gpd->runtime.sbuffer_size - 1; i >= 0; i--)
depth_arr[i] = 0.9999f;
}
else {
if (ts->gpencil_v3d_align & GP_PROJECT_DEPTH_STROKE_ENDPOINTS) {
/* remove all info between the valid endpoints */
int first_valid = 0;
int last_valid = 0;
for (i = 0; i < gpd->runtime.sbuffer_size; i++) {
if (depth_arr[i] != FLT_MAX)
break;
}
first_valid = i;
for (i = gpd->runtime.sbuffer_size - 1; i >= 0; i--) {
if (depth_arr[i] != FLT_MAX)
break;
}
last_valid = i;
/* invalidate non-endpoints, so only blend between first and last */
for (i = first_valid + 1; i < last_valid; i++)
depth_arr[i] = FLT_MAX;
interp_depth = true;
}
if (interp_depth) {
interp_sparse_array(depth_arr, gpd->runtime.sbuffer_size, FLT_MAX);
}
}
}
pt = gps->points;
dvert = gps->dvert;
/* convert all points (normal behavior) */
for (i = 0, ptc = gpd->runtime.sbuffer; i < gpd->runtime.sbuffer_size && ptc; i++, ptc++, pt++) {
/* convert screen-coordinates to appropriate coordinates (and store them) */
gp_stroke_convertcoords(p, &ptc->x, &pt->x, depth_arr ? depth_arr + i : NULL);
/* copy pressure and time */
pt->pressure = ptc->pressure;
pt->strength = ptc->strength;
CLAMP(pt->strength, GPENCIL_STRENGTH_MIN, 1.0f);
pt->time = ptc->time;
pt->uv_fac = ptc->uv_fac;
pt->uv_rot = ptc->uv_rot;
if (dvert != NULL) {
dvert->totweight = 0;
dvert->dw = NULL;
dvert++;
}
}
/* subdivide and smooth the stroke */
if ((brush->gpencil_settings->flag & GP_BRUSH_GROUP_SETTINGS) && (subdivide > 0)) {
gp_subdivide_stroke(gps, subdivide);
}
/* apply randomness to stroke */
if ((brush->gpencil_settings->flag & GP_BRUSH_GROUP_RANDOM) &&
(brush->gpencil_settings->draw_random_sub > 0.0f))
{
gp_randomize_stroke(gps, brush, p->rng);
}
/* smooth stroke after subdiv - only if there's something to do
* for each iteration, the factor is reduced to get a better smoothing without changing too much
* the original stroke
*/
if ((brush->gpencil_settings->flag & GP_BRUSH_GROUP_SETTINGS) &&
(brush->gpencil_settings->draw_smoothfac > 0.0f))
{
float reduce = 0.0f;
for (int r = 0; r < brush->gpencil_settings->draw_smoothlvl; r++) {
for (i = 0; i < gps->totpoints - 1; i++) {
BKE_gpencil_smooth_stroke(gps, i, brush->gpencil_settings->draw_smoothfac - reduce);
BKE_gpencil_smooth_stroke_strength(gps, i, brush->gpencil_settings->draw_smoothfac);
}
reduce += 0.25f; // reduce the factor
}
}
/* smooth thickness */
if ((brush->gpencil_settings->flag & GP_BRUSH_GROUP_SETTINGS) &&
(brush->gpencil_settings->thick_smoothfac > 0.0f))
{
for (int r = 0; r < brush->gpencil_settings->thick_smoothlvl * 2; r++) {
for (i = 0; i < gps->totpoints - 1; i++) {
BKE_gpencil_smooth_stroke_thickness(gps, i, brush->gpencil_settings->thick_smoothfac);
}
}
}
/* reproject to plane (only in 3d space) */
gp_reproject_toplane(p, gps);
/* change position relative to parent object */
gp_apply_parent(depsgraph, obact, gpd, gpl, gps);
if (depth_arr)
MEM_freeN(depth_arr);
}
/* Save material index */
gps->mat_nr = BKE_gpencil_get_material_index(p->ob, p->material) - 1;
/* calculate UVs along the stroke */
ED_gpencil_calc_stroke_uv(obact, gps);
/* add stroke to frame, usually on tail of the listbase, but if on back is enabled the stroke is added on listbase head
* because the drawing order is inverse and the head stroke is the first to draw. This is very useful for artist
* when drawing the background
*/
if ((ts->gpencil_flags & GP_TOOL_FLAG_PAINT_ONBACK) && (p->paintmode != GP_PAINTMODE_DRAW_POLY)) {
BLI_addhead(&p->gpf->strokes, gps);
}
else {
BLI_addtail(&p->gpf->strokes, gps);
}
/* add weights */
if ((ts->gpencil_flags & GP_TOOL_FLAG_CREATE_WEIGHTS) && (have_weight)) {
BKE_gpencil_dvert_ensure(gps);
for (i = 0; i < gps->totpoints; i++) {
MDeformVert *ve = &gps->dvert[i];
MDeformWeight *dw = defvert_verify_index(ve, def_nr);
if (dw) {
dw->weight = ts->vgroup_weight;
}
}
}
gp_stroke_added_enable(p);
}
/* --- 'Eraser' for 'Paint' Tool ------ */
/* which which point is infront (result should only be used for comparison) */
static float view3d_point_depth(const RegionView3D *rv3d, const float co[3])
{
if (rv3d->is_persp) {
return ED_view3d_calc_zfac(rv3d, co, NULL);
}
else {
return -dot_v3v3(rv3d->viewinv[2], co);
}
}
/* only erase stroke points that are visible */
static bool gp_stroke_eraser_is_occluded(tGPsdata *p, const bGPDspoint *pt, const int x, const int y)
{
Object *obact = (Object *)p->ownerPtr.data;
if ((p->sa->spacetype == SPACE_VIEW3D) &&
(p->flags & GP_PAINTFLAG_V3D_ERASER_DEPTH))
{
RegionView3D *rv3d = p->ar->regiondata;
bGPDlayer *gpl = p->gpl;
const int mval[2] = {x, y};
float mval_3d[3];
float fpt[3];
float diff_mat[4][4];
/* calculate difference matrix if parent object */
ED_gpencil_parent_location(p->depsgraph, obact, p->gpd, gpl, diff_mat);
if (ED_view3d_autodist_simple(p->ar, mval, mval_3d, 0, NULL)) {
const float depth_mval = view3d_point_depth(rv3d, mval_3d);
mul_v3_m4v3(fpt, diff_mat, &pt->x);
const float depth_pt = view3d_point_depth(rv3d, fpt);
if (depth_pt > depth_mval) {
return true;
}
}
}
return false;
}
/* apply a falloff effect to brush strength, based on distance */
static float gp_stroke_eraser_calc_influence(tGPsdata *p, const int mval[2], const int radius, const int co[2])
{
/* Linear Falloff... */
float distance = (float)len_v2v2_int(mval, co);
float fac;
CLAMP(distance, 0.0f, (float)radius);
fac = 1.0f - (distance / (float)radius);
/* Control this further using pen pressure */
fac *= p->pressure;
/* Return influence factor computed here */
return fac;
}
/* helper to free a stroke */
static void gp_free_stroke(bGPdata *gpd, bGPDframe *gpf, bGPDstroke *gps)
{
if (gps->points) {
MEM_freeN(gps->points);
}
if (gps->dvert) {
BKE_gpencil_free_stroke_weights(gps);
MEM_freeN(gps->dvert);
}
if (gps->triangles)
MEM_freeN(gps->triangles);
BLI_freelinkN(&gpf->strokes, gps);
gp_update_cache(gpd);
}
/* eraser tool - evaluation per stroke */
/* TODO: this could really do with some optimization (KD-Tree/BVH?) */
static void gp_stroke_eraser_dostroke(tGPsdata *p,
bGPDlayer *gpl, bGPDframe *gpf, bGPDstroke *gps,
const int mval[2], const int mvalo[2],
const int radius, const rcti *rect)
{
Depsgraph *depsgraph = p->depsgraph;
Object *obact = (Object *)p->ownerPtr.data;
Brush *eraser = p->eraser;
bGPDspoint *pt1, *pt2;
int pc1[2] = {0};
int pc2[2] = {0};
int i;
float diff_mat[4][4];
/* calculate difference matrix */
ED_gpencil_parent_location(depsgraph, obact, p->gpd, gpl, diff_mat);
if (gps->totpoints == 0) {
/* just free stroke */
gp_free_stroke(p->gpd, gpf, gps);
}
else if (gps->totpoints == 1) {
/* only process if it hasn't been masked out... */
if (!(p->flags & GP_PAINTFLAG_SELECTMASK) || (gps->points->flag & GP_SPOINT_SELECT)) {
bGPDspoint pt_temp;
gp_point_to_parent_space(gps->points, diff_mat, &pt_temp);
gp_point_to_xy(&p->gsc, gps, &pt_temp, &pc1[0], &pc1[1]);
/* do boundbox check first */
if ((!ELEM(V2D_IS_CLIPPED, pc1[0], pc1[1])) && BLI_rcti_isect_pt(rect, pc1[0], pc1[1])) {
/* only check if point is inside */
if (len_v2v2_int(mval, pc1) <= radius) {
/* free stroke */
gp_free_stroke(p->gpd, gpf, gps);
}
}
}
}
else if ((p->flags & GP_PAINTFLAG_STROKE_ERASER) || (eraser->gpencil_settings->eraser_mode == GP_BRUSH_ERASER_STROKE)) {
for (i = 0; (i + 1) < gps->totpoints; i++) {
/* only process if it hasn't been masked out... */
if ((p->flags & GP_PAINTFLAG_SELECTMASK) && !(gps->points->flag & GP_SPOINT_SELECT))
continue;
/* get points to work with */
pt1 = gps->points + i;
bGPDspoint npt;
gp_point_to_parent_space(pt1, diff_mat, &npt);
gp_point_to_xy(&p->gsc, gps, &npt, &pc1[0], &pc1[1]);
/* do boundbox check first */
if ((!ELEM(V2D_IS_CLIPPED, pc1[0], pc1[1])) && BLI_rcti_isect_pt(rect, pc1[0], pc1[1])) {
/* only check if point is inside */
if (len_v2v2_int(mval, pc1) <= radius) {
/* free stroke */
gp_free_stroke(p->gpd, gpf, gps);
return;
}
}
}
}
else {
/* Pressure threshold at which stroke should be culled: Calculated as pressure value
* below which we would have invisible strokes
*/
const float cull_thresh = (gps->thickness) ? 1.0f / ((float)gps->thickness) : 1.0f;
/* Amount to decrease the pressure of each point with each stroke */
// TODO: Fetch from toolsettings, or compute based on thickness instead?
const float strength = 0.1f;
/* Perform culling? */
bool do_cull = false;
/* Clear Tags
*
* Note: It's better this way, as we are sure that
* we don't miss anything, though things will be
* slightly slower as a result
*/
for (i = 0; i < gps->totpoints; i++) {
bGPDspoint *pt = &gps->points[i];
pt->flag &= ~GP_SPOINT_TAG;
}
/* First Pass: Loop over the points in the stroke
* 1) Thin out parts of the stroke under the brush
* 2) Tag "too thin" parts for removal (in second pass)
*/
for (i = 0; (i + 1) < gps->totpoints; i++) {
/* get points to work with */
pt1 = gps->points + i;
pt2 = gps->points + i + 1;
/* only process if it hasn't been masked out... */
if ((p->flags & GP_PAINTFLAG_SELECTMASK) && !(gps->points->flag & GP_SPOINT_SELECT))
continue;
bGPDspoint npt;
gp_point_to_parent_space(pt1, diff_mat, &npt);
gp_point_to_xy(&p->gsc, gps, &npt, &pc1[0], &pc1[1]);
gp_point_to_parent_space(pt2, diff_mat, &npt);
gp_point_to_xy(&p->gsc, gps, &npt, &pc2[0], &pc2[1]);
/* Check that point segment of the boundbox of the eraser stroke */
if (((!ELEM(V2D_IS_CLIPPED, pc1[0], pc1[1])) && BLI_rcti_isect_pt(rect, pc1[0], pc1[1])) ||
((!ELEM(V2D_IS_CLIPPED, pc2[0], pc2[1])) && BLI_rcti_isect_pt(rect, pc2[0], pc2[1])))
{
/* Check if point segment of stroke had anything to do with
* eraser region (either within stroke painted, or on its lines)
* - this assumes that linewidth is irrelevant
*/
if (gp_stroke_inside_circle(mval, mvalo, radius, pc1[0], pc1[1], pc2[0], pc2[1])) {
if ((gp_stroke_eraser_is_occluded(p, pt1, pc1[0], pc1[1]) == false) ||
(gp_stroke_eraser_is_occluded(p, pt2, pc2[0], pc2[1]) == false))
{
/* Point is affected: */
/* 1a) Adjust thickness
* - Influence of eraser falls off with distance from the middle of the eraser
* - Second point gets less influence, as it might get hit again in the next segment
*/
/* 1b) Adjust strength if the eraser is soft */
if (eraser->gpencil_settings->eraser_mode == GP_BRUSH_ERASER_SOFT) {
pt1->strength -= gp_stroke_eraser_calc_influence(p, mval, radius, pc1) * strength;
CLAMP_MIN(pt1->strength, 0.0f);
pt2->strength -= gp_stroke_eraser_calc_influence(p, mval, radius, pc2) * strength * 0.5f;
CLAMP_MIN(pt2->strength, 0.0f);
pt1->pressure -= gp_stroke_eraser_calc_influence(p, mval, radius, pc1) * strength * 0.10f;
pt2->pressure -= gp_stroke_eraser_calc_influence(p, mval, radius, pc2) * strength * 0.05f;
/* if invisible, delete point */
if ((pt1->strength <= GPENCIL_ALPHA_OPACITY_THRESH) || (pt1->pressure < cull_thresh)) {
pt1->flag |= GP_SPOINT_TAG;
do_cull = true;
}
if ((pt2->strength <= GPENCIL_ALPHA_OPACITY_THRESH) || (pt2->pressure < cull_thresh)) {
pt2->flag |= GP_SPOINT_TAG;
do_cull = true;
}
}
else {
pt1->pressure -= gp_stroke_eraser_calc_influence(p, mval, radius, pc1) * strength;
pt2->pressure -= gp_stroke_eraser_calc_influence(p, mval, radius, pc2) * strength * 0.5f;
}
/* 2) Tag any point with overly low influence for removal in the next pass */
if ((pt1->pressure < cull_thresh) || (p->flags & GP_PAINTFLAG_HARD_ERASER) ||
(eraser->gpencil_settings->eraser_mode == GP_BRUSH_ERASER_HARD))
{
pt1->flag |= GP_SPOINT_TAG;
do_cull = true;
}
if ((pt2->pressure < cull_thresh) || (p->flags & GP_PAINTFLAG_HARD_ERASER) ||
(eraser->gpencil_settings->eraser_mode == GP_BRUSH_ERASER_HARD))
{
pt2->flag |= GP_SPOINT_TAG;
do_cull = true;
}
}
}
}
}
/* Second Pass: Remove any points that are tagged */
if (do_cull) {
gp_stroke_delete_tagged_points(gpf, gps, gps->next, GP_SPOINT_TAG, false);
}
gp_update_cache(p->gpd);
}
}
/* erase strokes which fall under the eraser strokes */
static void gp_stroke_doeraser(tGPsdata *p)
{
bGPDlayer *gpl;
bGPDstroke *gps, *gpn;
rcti rect;
/* rect is rectangle of eraser */
rect.xmin = p->mval[0] - p->radius;
rect.ymin = p->mval[1] - p->radius;
rect.xmax = p->mval[0] + p->radius;
rect.ymax = p->mval[1] + p->radius;
if (p->sa->spacetype == SPACE_VIEW3D) {
if (p->flags & GP_PAINTFLAG_V3D_ERASER_DEPTH) {
View3D *v3d = p->sa->spacedata.first;
view3d_region_operator_needs_opengl(p->win, p->ar);
ED_view3d_autodist_init(p->depsgraph, p->ar, v3d, 0);
}
}
/* loop over all layers too, since while it's easy to restrict editing to
* only a subset of layers, it is harder to perform the same erase operation
* on multiple layers...
*/
for (gpl = p->gpd->layers.first; gpl; gpl = gpl->next) {
bGPDframe *gpf = gpl->actframe;
/* only affect layer if it's editable (and visible) */
if (gpencil_layer_is_editable(gpl) == false) {
continue;
}
else if (gpf == NULL) {
continue;
}
/* loop over strokes, checking segments for intersections */
for (gps = gpf->strokes.first; gps; gps = gpn) {
gpn = gps->next;
/* check if the color is editable */
if (ED_gpencil_stroke_color_use(p->ob, gpl, gps) == false) {
continue;
}
/* Not all strokes in the datablock may be valid in the current editor/context
* (e.g. 2D space strokes in the 3D view, if the same datablock is shared)
*/
if (ED_gpencil_stroke_can_use_direct(p->sa, gps)) {
gp_stroke_eraser_dostroke(p, gpl, gpf, gps, p->mval, p->mvalo, p->radius, &rect);
}
}
}
}
/* ******************************************* */
/* Sketching Operator */
/* clear the session buffers (call this before AND after a paint operation) */
static void gp_session_validatebuffer(tGPsdata *p)
{
bGPdata *gpd = p->gpd;
Brush *brush = p->brush;
/* clear memory of buffer (or allocate it if starting a new session) */
if (gpd->runtime.sbuffer) {
/* printf("\t\tGP - reset sbuffer\n"); */
memset(gpd->runtime.sbuffer, 0, sizeof(tGPspoint) * GP_STROKE_BUFFER_MAX);
}
else {
/* printf("\t\tGP - allocate sbuffer\n"); */
gpd->runtime.sbuffer = MEM_callocN(sizeof(tGPspoint) * GP_STROKE_BUFFER_MAX, "gp_session_strokebuffer");
}
/* reset indices */
gpd->runtime.sbuffer_size = 0;
/* reset flags */
gpd->runtime.sbuffer_sflag = 0;
/* reset inittime */
p->inittime = 0.0;
/* reset lazy */
if (brush) {
brush->gpencil_settings->flag &= ~GP_BRUSH_STABILIZE_MOUSE_TEMP;
}
}
/* helper to get default eraser and create one if no eraser brush */
static Brush *gp_get_default_eraser(Main *bmain, ToolSettings *ts)
{
Brush *brush_dft = NULL;
Paint *paint = BKE_brush_get_gpencil_paint(ts);
Brush *brush_old = paint->brush;
for (Brush *brush = bmain->brush.first; brush; brush = brush->id.next) {
if ((brush->ob_mode == OB_MODE_GPENCIL_PAINT) &&
(brush->gpencil_settings->brush_type == GP_BRUSH_TYPE_ERASE))
{
/* save first eraser to use later if no default */
if (brush_dft == NULL) {
brush_dft = brush;
}
/* found default */
if (brush->gpencil_settings->flag & GP_BRUSH_DEFAULT_ERASER) {
return brush;
}
}
}
/* if no default, but exist eraser brush, return this and set as default */
if (brush_dft) {
brush_dft->gpencil_settings->flag |= GP_BRUSH_DEFAULT_ERASER;
return brush_dft;
}
/* create a new soft eraser brush */
else {
brush_dft = BKE_brush_add_gpencil(bmain, ts, "Soft Eraser");
brush_dft->size = 30.0f;
brush_dft->gpencil_settings->flag |= (GP_BRUSH_ENABLE_CURSOR | GP_BRUSH_DEFAULT_ERASER);
brush_dft->gpencil_settings->icon_id = GP_BRUSH_ICON_ERASE_SOFT;
brush_dft->gpencil_settings->brush_type = GP_BRUSH_TYPE_ERASE;
brush_dft->gpencil_settings->eraser_mode = GP_BRUSH_ERASER_SOFT;
/* reset current brush */
BKE_paint_brush_set(paint, brush_old);
return brush_dft;
}
}
/* initialize a drawing brush */
static void gp_init_drawing_brush(bContext *C, tGPsdata *p)
{
Brush *brush;
Scene *scene = CTX_data_scene(C);
ToolSettings *ts = CTX_data_tool_settings(C);
Paint *paint = BKE_brush_get_gpencil_paint(ts);
/* if not exist, create a new one */
if (paint->brush == NULL) {
/* create new brushes */
BKE_brush_gpencil_presets(C);
brush = BKE_brush_getactive_gpencil(ts);
}
else {
/* Use the current */
brush = BKE_brush_getactive_gpencil(ts);
}
/* be sure curves are initializated */
curvemapping_initialize(brush->gpencil_settings->curve_sensitivity);
curvemapping_initialize(brush->gpencil_settings->curve_strength);
curvemapping_initialize(brush->gpencil_settings->curve_jitter);
/* asign to temp tGPsdata */
p->brush = brush;
if (brush->gpencil_settings->brush_type != GP_BRUSH_TYPE_ERASE) {
p->eraser = gp_get_default_eraser(p->bmain, ts);
}
else {
p->eraser = brush;
}
/* use radius of eraser */
p->radius = (short)p->eraser->size;
/* GPXX: Need this update to synchronize brush with draw manager.
* Maybe this update can be removed when the new tool system
* will be in place, but while, we need this to keep drawing working.
*/
DEG_id_tag_update(&scene->id, DEG_TAG_COPY_ON_WRITE);
}
/* initialize a paint brush and a default color if not exist */
static void gp_init_colors(tGPsdata *p)
{
bGPdata *gpd = p->gpd;
Brush *brush = p->brush;
Material *ma = NULL;
MaterialGPencilStyle *gp_style = NULL;
/* use brush material */
ma = BKE_gpencil_get_material_from_brush(brush);
/* if no brush defaults, get material and color info
* NOTE: Ensures that everything we need will exist...
*/
if ((ma == NULL) || (ma->gp_style == NULL)) {
BKE_gpencil_material_ensure(p->bmain, p->ob);
/* assign always the first material to the brush */
p->material = give_current_material(p->ob, 1);
brush->gpencil_settings->material = p->material;
}
else {
p->material = ma;
}
/* check if the material is already on object material slots and add it if missing */
if (BKE_gpencil_get_material_index(p->ob, p->material) == 0) {
BKE_object_material_slot_add(p->bmain, p->ob);
assign_material(p->bmain, p->ob, ma, p->ob->totcol, BKE_MAT_ASSIGN_USERPREF);
}
/* assign color information to temp tGPsdata */
gp_style = p->material->gp_style;
if (gp_style) {
/* set colors */
copy_v4_v4(gpd->runtime.scolor, gp_style->stroke_rgba);
copy_v4_v4(gpd->runtime.sfill, gp_style->fill_rgba);
/* add some alpha to make easy the filling without hide strokes */
if (gpd->runtime.sfill[3] > 0.8f) {
gpd->runtime.sfill[3] = 0.8f;
}
gpd->runtime.mode = (short)gp_style->mode;
gpd->runtime.bstroke_style = gp_style->stroke_style;
gpd->runtime.bfill_style = gp_style->fill_style;
}
}
/* (re)init new painting data */
static bool gp_session_initdata(bContext *C, wmOperator *op, tGPsdata *p)
{
Main *bmain = CTX_data_main(C);
bGPdata **gpd_ptr = NULL;
ScrArea *curarea = CTX_wm_area(C);
ARegion *ar = CTX_wm_region(C);
ToolSettings *ts = CTX_data_tool_settings(C);
Object *obact = CTX_data_active_object(C);
View3D *v3d = curarea->spacedata.first;
/* make sure the active view (at the starting time) is a 3d-view */
if (curarea == NULL) {
p->status = GP_STATUS_ERROR;
if (G.debug & G_DEBUG)
printf("Error: No active view for painting\n");
return 0;
}
/* pass on current scene and window */
p->C = C;
p->bmain = CTX_data_main(C);
p->scene = CTX_data_scene(C);
p->depsgraph = CTX_data_depsgraph(C);
p->win = CTX_wm_window(C);
p->disable_fill = RNA_boolean_get(op->ptr, "disable_fill");
unit_m4(p->imat);
unit_m4(p->mat);
switch (curarea->spacetype) {
/* supported views first */
case SPACE_VIEW3D:
{
/* View3D *v3d = curarea->spacedata.first; */
/* RegionView3D *rv3d = ar->regiondata; */
/* set current area
* - must verify that region data is 3D-view (and not something else)
*/
/* CAUTION: If this is the "toolbar", then this will change on the first stroke */
p->sa = curarea;
p->ar = ar;
p->align_flag = &ts->gpencil_v3d_align;
if (ar->regiondata == NULL) {
p->status = GP_STATUS_ERROR;
if (G.debug & G_DEBUG)
printf("Error: 3D-View active region doesn't have any region data, so cannot be drawable\n");
return 0;
}
/* if active object doesn't exist or isn't a GP Object, create one */
float *cur = ED_view3d_cursor3d_get(p->scene, v3d)->location;
if ((!obact) || (obact->type != OB_GPENCIL)) {
/* create new default object */
obact = ED_add_gpencil_object(C, p->scene, cur);
}
/* assign object after all checks to be sure we have one active */
p->ob = obact;
break;
}
/* unsupported views */
default:
{
p->status = GP_STATUS_ERROR;
if (G.debug & G_DEBUG)
printf("Error: Active view not appropriate for Grease Pencil drawing\n");
return 0;
}
}
/* get gp-data */
gpd_ptr = ED_gpencil_data_get_pointers(C, &p->ownerPtr);
if ((gpd_ptr == NULL) || ED_gpencil_data_owner_is_annotation(&p->ownerPtr)) {
p->status = GP_STATUS_ERROR;
if (G.debug & G_DEBUG)
printf("Error: Current context doesn't allow for any Grease Pencil data\n");
return 0;
}
else {
/* if no existing GPencil block exists, add one */
if (*gpd_ptr == NULL)
*gpd_ptr = BKE_gpencil_data_addnew(bmain, "GPencil");
p->gpd = *gpd_ptr;
}
if (ED_gpencil_session_active() == 0) {
/* initialize undo stack,
* also, existing undo stack would make buffer drawn
*/
gpencil_undo_init(p->gpd);
}
/* clear out buffer (stored in gp-data), in case something contaminated it */
gp_session_validatebuffer(p);
/* set brush and create a new one if null */
gp_init_drawing_brush(C, p);
/* setup active color */
if (curarea->spacetype == SPACE_VIEW3D) {
/* NOTE: This is only done for 3D view, as Materials aren't used for
* annotations in 2D editors
*/
gp_init_colors(p);
}
/* lock axis */
p->lock_axis = ts->gp_sculpt.lock_axis;
return 1;
}
/* init new painting session */
static tGPsdata *gp_session_initpaint(bContext *C, wmOperator *op)
{
tGPsdata *p = NULL;
/* Create new context data */
p = MEM_callocN(sizeof(tGPsdata), "GPencil Drawing Data");
/* Try to initialise context data
* WARNING: This may not always succeed (e.g. using GP in an annotation-only context)
*/
if (gp_session_initdata(C, op, p) == 0) {
/* Invalid state - Exit
* NOTE: It should be safe to just free the data, since failing context checks should
* only happen when no data has been allocated.
*/
MEM_freeN(p);
return NULL;
}
/* Random generator, only init once. */
uint rng_seed = (uint)(PIL_check_seconds_timer_i() & UINT_MAX);
rng_seed ^= GET_UINT_FROM_POINTER(p);
p->rng = BLI_rng_new(rng_seed);
/* return context data for running paint operator */
return p;
}
/* cleanup after a painting session */
static void gp_session_cleanup(tGPsdata *p)
{
bGPdata *gpd = (p) ? p->gpd : NULL;
/* error checking */
if (gpd == NULL)
return;
/* free stroke buffer */
if (gpd->runtime.sbuffer) {
/* printf("\t\tGP - free sbuffer\n"); */
MEM_freeN(gpd->runtime.sbuffer);
gpd->runtime.sbuffer = NULL;
}
/* clear flags */
gpd->runtime.sbuffer_size = 0;
gpd->runtime.sbuffer_sflag = 0;
p->inittime = 0.0;
}
static void gp_session_free(tGPsdata *p)
{
if (p->rng != NULL) {
BLI_rng_free(p->rng);
}
MEM_freeN(p);
}
/* init new stroke */
static void gp_paint_initstroke(tGPsdata *p, eGPencil_PaintModes paintmode, Depsgraph *depsgraph)
{
Scene *scene = p->scene;
ToolSettings *ts = scene->toolsettings;
int cfra_eval = (int)DEG_get_ctime(p->depsgraph);
/* get active layer (or add a new one if non-existent) */
p->gpl = BKE_gpencil_layer_getactive(p->gpd);
if (p->gpl == NULL) {
p->gpl = BKE_gpencil_layer_addnew(p->gpd, DATA_("GP_Layer"), true);
if (p->custom_color[3])
copy_v3_v3(p->gpl->color, p->custom_color);
}
if (p->gpl->flag & GP_LAYER_LOCKED) {
p->status = GP_STATUS_ERROR;
if (G.debug & G_DEBUG)
printf("Error: Cannot paint on locked layer\n");
return;
}
/* get active frame (add a new one if not matching frame) */
if (paintmode == GP_PAINTMODE_ERASER) {
/* Eraser mode:
* 1) Add new frames to all frames that we might touch,
* 2) Ensure that p->gpf refers to the frame used for the active layer
* (to avoid problems with other tools which expect it to exist)
*/
bool has_layer_to_erase = false;
for (bGPDlayer *gpl = p->gpd->layers.first; gpl; gpl = gpl->next) {
/* Skip if layer not editable */
if (gpencil_layer_is_editable(gpl) == false)
continue;
/* Add a new frame if needed (and based off the active frame,
* as we need some existing strokes to erase)
*
* Note: We don't add a new frame if there's nothing there now, so
* -> If there are no frames at all, don't add one
* -> If there are no strokes in that frame, don't add a new empty frame
*/
if (gpl->actframe && gpl->actframe->strokes.first) {
gpl->actframe = BKE_gpencil_layer_getframe(gpl, cfra_eval, GP_GETFRAME_ADD_COPY);
has_layer_to_erase = true;
}
/* XXX: we omit GP_FRAME_PAINT here for now,
* as it is only really useful for doing
* paintbuffer drawing
*/
}
/* Ensure this gets set... */
p->gpf = p->gpl->actframe;
/* Restrict eraser to only affecting selected strokes, if the "selection mask" is on
* (though this is only available in editmode)
*/
if (p->gpd->flag & GP_DATA_STROKE_EDITMODE) {
if (ts->gp_sculpt.flag & GP_BRUSHEDIT_FLAG_SELECT_MASK) {
p->flags |= GP_PAINTFLAG_SELECTMASK;
}
}
if (has_layer_to_erase == false) {
p->status = GP_STATUS_ERROR;
//if (G.debug & G_DEBUG)
printf("Error: Eraser will not be affecting anything (gpencil_paint_init)\n");
return;
}
}
else {
/* Drawing Modes - Add a new frame if needed on the active layer */
short add_frame_mode;
if (ts->gpencil_flags & GP_TOOL_FLAG_RETAIN_LAST)
add_frame_mode = GP_GETFRAME_ADD_COPY;
else
add_frame_mode = GP_GETFRAME_ADD_NEW;
p->gpf = BKE_gpencil_layer_getframe(p->gpl, cfra_eval, add_frame_mode);
/* set as dirty draw manager cache */
gp_update_cache(p->gpd);
if (p->gpf == NULL) {
p->status = GP_STATUS_ERROR;
if (G.debug & G_DEBUG)
printf("Error: No frame created (gpencil_paint_init)\n");
return;
}
else {
p->gpf->flag |= GP_FRAME_PAINT;
}
}
/* set 'eraser' for this stroke if using eraser */
p->paintmode = paintmode;
if (p->paintmode == GP_PAINTMODE_ERASER) {
p->gpd->runtime.sbuffer_sflag |= GP_STROKE_ERASER;
/* check if we should respect depth while erasing */
if (p->sa->spacetype == SPACE_VIEW3D) {
if (p->gpl->flag & GP_LAYER_NO_XRAY) {
p->flags |= GP_PAINTFLAG_V3D_ERASER_DEPTH;
}
}
}
else {
/* disable eraser flags - so that we can switch modes during a session */
p->gpd->runtime.sbuffer_sflag &= ~GP_STROKE_ERASER;
if (p->sa->spacetype == SPACE_VIEW3D) {
if (p->gpl->flag & GP_LAYER_NO_XRAY) {
p->flags &= ~GP_PAINTFLAG_V3D_ERASER_DEPTH;
}
}
}
/* set special fill stroke mode */
if (p->disable_fill == true) {
p->gpd->runtime.sbuffer_sflag |= GP_STROKE_NOFILL;
/* replace stroke color with fill color */
copy_v4_v4(p->gpd->runtime.scolor, p->gpd->runtime.sfill);
}
/* set 'initial run' flag, which is only used to denote when a new stroke is starting */
p->flags |= GP_PAINTFLAG_FIRSTRUN;
/* when drawing in the camera view, in 2D space, set the subrect */
p->subrect = NULL;
if ((*p->align_flag & GP_PROJECT_VIEWSPACE) == 0) {
if (p->sa->spacetype == SPACE_VIEW3D) {
View3D *v3d = p->sa->spacedata.first;
RegionView3D *rv3d = p->ar->regiondata;
/* for camera view set the subrect */
if (rv3d->persp == RV3D_CAMOB) {
ED_view3d_calc_camera_border(p->scene, depsgraph, p->ar, v3d, rv3d, &p->subrect_data, true); /* no shift */
p->subrect = &p->subrect_data;
}
}
}
/* init stroke point space-conversion settings... */
p->gsc.gpd = p->gpd;
p->gsc.gpl = p->gpl;
p->gsc.sa = p->sa;
p->gsc.ar = p->ar;
p->gsc.v2d = p->v2d;
p->gsc.subrect_data = p->subrect_data;
p->gsc.subrect = p->subrect;
copy_m4_m4(p->gsc.mat, p->mat);
/* check if points will need to be made in view-aligned space */
if (*p->align_flag & GP_PROJECT_VIEWSPACE) {
switch (p->sa->spacetype) {
case SPACE_VIEW3D:
{
p->gpd->runtime.sbuffer_sflag |= GP_STROKE_3DSPACE;
break;
}
}
}
}
/* finish off a stroke (clears buffer, but doesn't finish the paint operation) */
static void gp_paint_strokeend(tGPsdata *p)
{
ToolSettings *ts = p->scene->toolsettings;
/* for surface sketching, need to set the right OpenGL context stuff so that
* the conversions will project the values correctly...
*/
if (gpencil_project_check(p)) {
View3D *v3d = p->sa->spacedata.first;
/* need to restore the original projection settings before packing up */
view3d_region_operator_needs_opengl(p->win, p->ar);
ED_view3d_autodist_init(p->depsgraph, p->ar, v3d, (ts->gpencil_v3d_align & GP_PROJECT_DEPTH_STROKE) ? 1 : 0);
}
/* check if doing eraser or not */
if ((p->gpd->runtime.sbuffer_sflag & GP_STROKE_ERASER) == 0) {
/* simplify stroke before transferring? */
gp_stroke_simplify(p);
/* transfer stroke to frame */
gp_stroke_newfrombuffer(p);
}
/* clean up buffer now */
gp_session_validatebuffer(p);
}
/* finish off stroke painting operation */
static void gp_paint_cleanup(tGPsdata *p)
{
/* p->gpd==NULL happens when stroke failed to initialize,
* for example when GP is hidden in current space (sergey)
*/
if (p->gpd) {
/* finish off a stroke */
gp_paint_strokeend(p);
}
/* "unlock" frame */
if (p->gpf)
p->gpf->flag &= ~GP_FRAME_PAINT;
}
/* ------------------------------- */
/* Helper callback for drawing the cursor itself */
static void gpencil_draw_eraser(bContext *UNUSED(C), int x, int y, void *p_ptr)
{
tGPsdata *p = (tGPsdata *)p_ptr;
if (p->paintmode == GP_PAINTMODE_ERASER) {
GPUVertFormat *format = immVertexFormat();
const uint shdr_pos = GPU_vertformat_attr_add(format, "pos", GPU_COMP_F32, 2, GPU_FETCH_FLOAT);
immBindBuiltinProgram(GPU_SHADER_2D_UNIFORM_COLOR);
GPU_line_smooth(true);
GPU_blend(true);
GPU_blend_set_func_separate(GPU_SRC_ALPHA, GPU_ONE_MINUS_SRC_ALPHA, GPU_ONE, GPU_ONE_MINUS_SRC_ALPHA);
immUniformColor4ub(255, 100, 100, 20);
imm_draw_circle_fill_2d(shdr_pos, x, y, p->radius, 40);
immUnbindProgram();
immBindBuiltinProgram(GPU_SHADER_2D_LINE_DASHED_UNIFORM_COLOR);
float viewport_size[4];
GPU_viewport_size_get_f(viewport_size);
immUniform2f("viewport_size", viewport_size[2], viewport_size[3]);
immUniformColor4f(1.0f, 0.39f, 0.39f, 0.78f);
immUniform1i("colors_len", 0); /* "simple" mode */
immUniform1f("dash_width", 12.0f);
immUniform1f("dash_factor", 0.5f);
imm_draw_circle_wire_2d(shdr_pos, x, y, p->radius,
/* XXX Dashed shader gives bad results with sets of small segments currently,
* temp hack around the issue. :( */
max_ii(8, p->radius / 2)); /* was fixed 40 */
immUnbindProgram();
GPU_blend(false);
GPU_line_smooth(false);
}
}
/* Turn brush cursor in 3D view on/off */
static void gpencil_draw_toggle_eraser_cursor(bContext *C, tGPsdata *p, short enable)
{
if (p->erasercursor && !enable) {
/* clear cursor */
WM_paint_cursor_end(CTX_wm_manager(C), p->erasercursor);
p->erasercursor = NULL;
}
else if (enable && !p->erasercursor) {
ED_gpencil_toggle_brush_cursor(p->C, false, NULL);
/* enable cursor */
p->erasercursor = WM_paint_cursor_activate(
CTX_wm_manager(C),
NULL, /* XXX */
gpencil_draw_eraser, p);
}
}
/* Check if tablet eraser is being used (when processing events) */
static bool gpencil_is_tablet_eraser_active(const wmEvent *event)
{
if (event->tablet_data) {
const wmTabletData *wmtab = event->tablet_data;
return (wmtab->Active == EVT_TABLET_ERASER);
}
return false;
}
/* ------------------------------- */
static void gpencil_draw_exit(bContext *C, wmOperator *op)
{
tGPsdata *p = op->customdata;
/* don't assume that operator data exists at all */
if (p) {
/* check size of buffer before cleanup, to determine if anything happened here */
if (p->paintmode == GP_PAINTMODE_ERASER) {
/* turn off radial brush cursor */
gpencil_draw_toggle_eraser_cursor(C, p, false);
}
/* always store the new eraser size to be used again next time
* NOTE: Do this even when not in eraser mode, as eraser may
* have been toggled at some point.
*/
if (p->eraser) {
p->eraser->size = p->radius;
}
/* restore cursor to indicate end of drawing */
if (p->sa->spacetype != SPACE_VIEW3D) {
WM_cursor_modal_restore(CTX_wm_window(C));
}
else {
/* or restore paint if 3D view */
if ((p) && (p->paintmode == GP_PAINTMODE_ERASER)) {
WM_cursor_modal_set(p->win, CURSOR_STD);
}
/* drawing batch cache is dirty now */
bGPdata *gpd = CTX_data_gpencil_data(C);
if (gpd) {
gpd->flag &= ~GP_DATA_STROKE_POLYGON;
gp_update_cache(gpd);
}
}
/* clear undo stack */
gpencil_undo_finish();
/* cleanup */
gp_paint_cleanup(p);
gp_session_cleanup(p);
ED_gpencil_toggle_brush_cursor(C, true, NULL);
/* finally, free the temp data */
gp_session_free(p);
p = NULL;
}
op->customdata = NULL;
}
static void gpencil_draw_cancel(bContext *C, wmOperator *op)
{
/* this is just a wrapper around exit() */
gpencil_draw_exit(C, op);
}
/* ------------------------------- */
static int gpencil_draw_init(bContext *C, wmOperator *op, const wmEvent *event)
{
tGPsdata *p;
eGPencil_PaintModes paintmode = RNA_enum_get(op->ptr, "mode");
ToolSettings *ts = CTX_data_tool_settings(C);
Brush *brush = BKE_brush_getactive_gpencil(ts);
/* if mode is draw and the brush is eraser, cancel */
if (paintmode != GP_PAINTMODE_ERASER) {
if ((brush) && (brush->gpencil_settings->brush_type == GP_BRUSH_TYPE_ERASE)) {
return 0;
}
}
/* check context */
p = op->customdata = gp_session_initpaint(C, op);
if ((p == NULL) || (p->status == GP_STATUS_ERROR)) {
/* something wasn't set correctly in context */
gpencil_draw_exit(C, op);
return 0;
}
/* init painting data */
gp_paint_initstroke(p, paintmode, CTX_data_depsgraph(C));
if (p->status == GP_STATUS_ERROR) {
gpencil_draw_exit(C, op);
return 0;
}
if (event != NULL) {
p->keymodifier = event->keymodifier;
}
else {
p->keymodifier = -1;
}
p->reports = op->reports;
/* everything is now setup ok */
return 1;
}
/* ------------------------------- */
/* ensure that the correct cursor icon is set */
static void gpencil_draw_cursor_set(tGPsdata *p)
{
Brush *brush = p->brush;
if ((p->paintmode == GP_PAINTMODE_ERASER) ||
(brush->gpencil_settings->brush_type == GP_BRUSH_TYPE_ERASE))
{
WM_cursor_modal_set(p->win, BC_CROSSCURSOR); /* XXX need a better cursor */
}
else {
WM_cursor_modal_set(p->win, CURSOR_STD);
}
}
/* update UI indicators of status, including cursor and header prints */
static void gpencil_draw_status_indicators(bContext *C, tGPsdata *p)
{
/* header prints */
switch (p->status) {
#if 0 /* FIXME, this never runs! */
switch (p->paintmode) {
case GP_PAINTMODE_DRAW_POLY:
/* Provide usage tips, since this is modal, and unintuitive without hints */
ED_workspace_status_text(
C, IFACE_(
"Annotation Create Poly: LMB click to place next stroke vertex | "
"ESC/Enter to end (or click outside this area)"
));
break;
default:
/* Do nothing - the others are self explanatory, exit quickly once the mouse is released
* Showing any text would just be annoying as it would flicker.
*/
break;
}
#endif
case GP_STATUS_IDLING:
/* print status info */
switch (p->paintmode) {
case GP_PAINTMODE_ERASER:
ED_workspace_status_text(C, IFACE_("Grease Pencil Erase Session: Hold and drag LMB or RMB to erase | "
"ESC/Enter to end (or click outside this area)"));
break;
case GP_PAINTMODE_DRAW_STRAIGHT:
ED_workspace_status_text(C, IFACE_("Grease Pencil Line Session: Hold and drag LMB to draw | "
"ESC/Enter to end (or click outside this area)"));
break;
case GP_PAINTMODE_DRAW:
ED_workspace_status_text(C, IFACE_("Grease Pencil Freehand Session: Hold and drag LMB to draw"));
break;
case GP_PAINTMODE_DRAW_POLY:
ED_workspace_status_text(C, IFACE_("Grease Pencil Poly Session: LMB click to place next stroke vertex | "
"Release Shift/ESC/Enter to end (or click outside this area)"));
break;
default: /* unhandled future cases */
ED_workspace_status_text(C, IFACE_("Grease Pencil Session: ESC/Enter to end (or click outside this area)"));
break;
}
break;
case GP_STATUS_ERROR:
case GP_STATUS_DONE:
/* clear status string */
ED_workspace_status_text(C, NULL);
break;
case GP_STATUS_PAINTING:
break;
}
}
/* ------------------------------- */
/* create a new stroke point at the point indicated by the painting context */
static void gpencil_draw_apply(bContext *C, wmOperator *op, tGPsdata *p, Depsgraph *depsgraph)
{
bGPdata *gpd = p->gpd;
tGPspoint *pt = NULL;
/* handle drawing/erasing -> test for erasing first */
if (p->paintmode == GP_PAINTMODE_ERASER) {
/* do 'live' erasing now */
gp_stroke_doeraser(p);
/* store used values */
p->mvalo[0] = p->mval[0];
p->mvalo[1] = p->mval[1];
p->opressure = p->pressure;
}
/* only add current point to buffer if mouse moved (even though we got an event, it might be just noise) */
else if (gp_stroke_filtermval(p, p->mval, p->mvalo)) {
/* if lazy mouse, interpolate the last and current mouse positions */
if (GPENCIL_LAZY_MODE(p->brush, p->shift)) {
float now_mouse[2];
float last_mouse[2];
copy_v2fl_v2i(now_mouse, p->mval);
copy_v2fl_v2i(last_mouse, p->mvalo);
interp_v2_v2v2(now_mouse, now_mouse, last_mouse, p->brush->smooth_stroke_factor);
round_v2i_v2fl(p->mval, now_mouse);
}
/* try to add point */
short ok = gp_stroke_addpoint(p, p->mval, p->pressure, p->curtime);
/* handle errors while adding point */
if ((ok == GP_STROKEADD_FULL) || (ok == GP_STROKEADD_OVERFLOW)) {
/* finish off old stroke */
gp_paint_strokeend(p);
/* And start a new one!!! Else, projection errors! */
gp_paint_initstroke(p, p->paintmode, depsgraph);
/* start a new stroke, starting from previous point */
/* XXX Must manually reset inittime... */
/* XXX We only need to reuse previous point if overflow! */
if (ok == GP_STROKEADD_OVERFLOW) {
p->inittime = p->ocurtime;
gp_stroke_addpoint(p, p->mvalo, p->opressure, p->ocurtime);
}
else {
p->inittime = p->curtime;
}
gp_stroke_addpoint(p, p->mval, p->pressure, p->curtime);
}
else if (ok == GP_STROKEADD_INVALID) {
/* the painting operation cannot continue... */
BKE_report(op->reports, RPT_ERROR, "Cannot paint stroke");
p->status = GP_STATUS_ERROR;
if (G.debug & G_DEBUG)
printf("Error: Grease-Pencil Paint - Add Point Invalid\n");
return;
}
/* store used values */
p->mvalo[0] = p->mval[0];
p->mvalo[1] = p->mval[1];
p->opressure = p->pressure;
p->ocurtime = p->curtime;
pt = (tGPspoint *)gpd->runtime.sbuffer + gpd->runtime.sbuffer_size - 1;
if (p->paintmode != GP_PAINTMODE_ERASER) {
ED_gpencil_toggle_brush_cursor(C, true, &pt->x);
}
}
else if ((p->brush->gpencil_settings->flag & GP_BRUSH_STABILIZE_MOUSE_TEMP) &&
(gpd->runtime.sbuffer_size > 0))
{
pt = (tGPspoint *)gpd->runtime.sbuffer + gpd->runtime.sbuffer_size - 1;
if (p->paintmode != GP_PAINTMODE_ERASER) {
ED_gpencil_toggle_brush_cursor(C, true, &pt->x);
}
}
}
/* handle draw event */
static void gpencil_draw_apply_event(bContext *C, wmOperator *op, const wmEvent *event, Depsgraph *depsgraph, int x, int y)
{
tGPsdata *p = op->customdata;
PointerRNA itemptr;
float mousef[2];
int tablet = 0;
/* convert from window-space to area-space mouse coordinates
* add any x,y override position for fake events
* NOTE: float to ints conversions, +1 factor is probably used to ensure a bit more accurate rounding...
*/
p->mval[0] = event->mval[0] + 1 - x;
p->mval[1] = event->mval[1] + 1 - y;
p->shift = event->shift;
/* verify key status for straight lines */
if ((event->alt > 0) && (RNA_boolean_get(op->ptr, "disable_straight") == false)) {
if (p->straight[0] == 0) {
int dx = abs(p->mval[0] - p->mvalo[0]);
int dy = abs(p->mval[1] - p->mvalo[1]);
if ((dx > 0) || (dy > 0)) {
/* check mouse direction to replace the other coordinate with previous values */
if (dx >= dy) {
/* horizontal */
p->straight[0] = 1;
p->straight[1] = (short)p->mval[1]; /* save y */
}
else {
/* vertical */
p->straight[0] = 2;
p->straight[1] = (short)p->mval[0]; /* save x */
}
}
}
}
else {
p->straight[0] = 0;
}
p->curtime = PIL_check_seconds_timer();
/* handle pressure sensitivity (which is supplied by tablets) */
if (event->tablet_data) {
const wmTabletData *wmtab = event->tablet_data;
tablet = (wmtab->Active != EVT_TABLET_NONE);
p->pressure = wmtab->Pressure;
/* Hack for pressure sensitive eraser on D+RMB when using a tablet:
* The pen has to float over the tablet surface, resulting in
* zero pressure (T47101). Ignore pressure values if floating
* (i.e. "effectively zero" pressure), and only when the "active"
* end is the stylus (i.e. the default when not eraser)
*/
if (p->paintmode == GP_PAINTMODE_ERASER) {
if ((wmtab->Active != EVT_TABLET_ERASER) && (p->pressure < 0.001f)) {
p->pressure = 1.0f;
}
}
}
else {
/* No tablet data -> No pressure info is available */
p->pressure = 1.0f;
}
/* special eraser modes */
if (p->paintmode == GP_PAINTMODE_ERASER) {
if (event->shift > 0) {
p->flags |= GP_PAINTFLAG_HARD_ERASER;
}
else {
p->flags &= ~GP_PAINTFLAG_HARD_ERASER;
}
if (event->alt > 0) {
p->flags |= GP_PAINTFLAG_STROKE_ERASER;
}
else {
p->flags &= ~GP_PAINTFLAG_STROKE_ERASER;
}
}
/* special exception for start of strokes (i.e. maybe for just a dot) */
if (p->flags & GP_PAINTFLAG_FIRSTRUN) {
p->flags &= ~GP_PAINTFLAG_FIRSTRUN;
p->mvalo[0] = p->mval[0];
p->mvalo[1] = p->mval[1];
p->opressure = p->pressure;
p->inittime = p->ocurtime = p->curtime;
p->straight[0] = 0;
p->straight[1] = 0;
/* special exception here for too high pressure values on first touch in
* windows for some tablets, then we just skip first touch...
*/
if (tablet && (p->pressure >= 0.99f))
return;
}
/* check if alt key is pressed and limit to straight lines */
if (p->straight[0] != 0) {
if (p->straight[0] == 1) {
/* horizontal */
p->mval[1] = p->straight[1]; /* replace y */
}
else {
/* vertical */
p->mval[0] = p->straight[1]; /* replace x */
}
}
/* fill in stroke data (not actually used directly by gpencil_draw_apply) */
RNA_collection_add(op->ptr, "stroke", &itemptr);
mousef[0] = p->mval[0];
mousef[1] = p->mval[1];
RNA_float_set_array(&itemptr, "mouse", mousef);
RNA_float_set(&itemptr, "pressure", p->pressure);
RNA_boolean_set(&itemptr, "is_start", (p->flags & GP_PAINTFLAG_FIRSTRUN) != 0);
RNA_float_set(&itemptr, "time", p->curtime - p->inittime);
/* apply the current latest drawing point */
gpencil_draw_apply(C, op, p, depsgraph);
/* force refresh */
ED_region_tag_redraw(p->ar); /* just active area for now, since doing whole screen is too slow */
}
/* ------------------------------- */
/* operator 'redo' (i.e. after changing some properties, but also for repeat last) */
static int gpencil_draw_exec(bContext *C, wmOperator *op)
{
tGPsdata *p = NULL;
Depsgraph *depsgraph = CTX_data_depsgraph(C);
/* printf("GPencil - Starting Re-Drawing\n"); */
/* try to initialize context data needed while drawing */
if (!gpencil_draw_init(C, op, NULL)) {
MEM_SAFE_FREE(op->customdata);
/* printf("\tGP - no valid data\n"); */
return OPERATOR_CANCELLED;
}
else
p = op->customdata;
/* printf("\tGP - Start redrawing stroke\n"); */
/* loop over the stroke RNA elements recorded (i.e. progress of mouse movement),
* setting the relevant values in context at each step, then applying
*/
RNA_BEGIN(op->ptr, itemptr, "stroke")
{
float mousef[2];
/* printf("\t\tGP - stroke elem\n"); */
/* get relevant data for this point from stroke */
RNA_float_get_array(&itemptr, "mouse", mousef);
p->mval[0] = (int)mousef[0];
p->mval[1] = (int)mousef[1];
p->pressure = RNA_float_get(&itemptr, "pressure");
p->curtime = (double)RNA_float_get(&itemptr, "time") + p->inittime;
if (RNA_boolean_get(&itemptr, "is_start")) {
/* if first-run flag isn't set already (i.e. not true first stroke),
* then we must terminate the previous one first before continuing
*/
if ((p->flags & GP_PAINTFLAG_FIRSTRUN) == 0) {
/* TODO: both of these ops can set error-status, but we probably don't need to worry */
gp_paint_strokeend(p);
gp_paint_initstroke(p, p->paintmode, depsgraph);
}
}
/* if first run, set previous data too */
if (p->flags & GP_PAINTFLAG_FIRSTRUN) {
p->flags &= ~GP_PAINTFLAG_FIRSTRUN;
p->mvalo[0] = p->mval[0];
p->mvalo[1] = p->mval[1];
p->opressure = p->pressure;
p->ocurtime = p->curtime;
}
/* apply this data as necessary now (as per usual) */
gpencil_draw_apply(C, op, p, depsgraph);
}
RNA_END;
/* printf("\tGP - done\n"); */
/* cleanup */
gpencil_draw_exit(C, op);
/* refreshes */
WM_event_add_notifier(C, NC_GPENCIL | NA_EDITED, NULL);
/* done */
return OPERATOR_FINISHED;
}
/* ------------------------------- */
/* start of interactive drawing part of operator */
static int gpencil_draw_invoke(bContext *C, wmOperator *op, const wmEvent *event)
{
tGPsdata *p = NULL;
if (G.debug & G_DEBUG)
printf("GPencil - Starting Drawing\n");
/* support for tablets eraser pen */
if (gpencil_is_tablet_eraser_active(event)) {
RNA_enum_set(op->ptr, "mode", GP_PAINTMODE_ERASER);
}
/* try to initialize context data needed while drawing */
if (!gpencil_draw_init(C, op, event)) {
if (op->customdata)
MEM_freeN(op->customdata);
if (G.debug & G_DEBUG)
printf("\tGP - no valid data\n");
return OPERATOR_CANCELLED;
}
else
p = op->customdata;
/* TODO: set any additional settings that we can take from the events?
* TODO? if tablet is erasing, force eraser to be on? */
/* TODO: move cursor setting stuff to stroke-start so that paintmode can be changed midway... */
/* if eraser is on, draw radial aid */
if (p->paintmode == GP_PAINTMODE_ERASER) {
gpencil_draw_toggle_eraser_cursor(C, p, true);
}
else {
ED_gpencil_toggle_brush_cursor(C, true, NULL);
}
/* set cursor
* NOTE: This may change later (i.e. intentionally via brush toggle,
* or unintentionally if the user scrolls outside the area)...
*/
gpencil_draw_cursor_set(p);
/* only start drawing immediately if we're allowed to do so... */
if (RNA_boolean_get(op->ptr, "wait_for_input") == false) {
/* hotkey invoked - start drawing */
/* printf("\tGP - set first spot\n"); */
p->status = GP_STATUS_PAINTING;
/* handle the initial drawing - i.e. for just doing a simple dot */
gpencil_draw_apply_event(C, op, event, CTX_data_depsgraph(C), 0, 0);
op->flag |= OP_IS_MODAL_CURSOR_REGION;
}
else {
/* toolbar invoked - don't start drawing yet... */
/* printf("\tGP - hotkey invoked... waiting for click-drag\n"); */
op->flag |= OP_IS_MODAL_CURSOR_REGION;
}
/* enable paint mode */
if (p->sa->spacetype == SPACE_VIEW3D) {
Object *ob = CTX_data_active_object(C);
if (ob && (ob->type == OB_GPENCIL) && ((p->gpd->flag & GP_DATA_STROKE_PAINTMODE) == 0)) {
/* FIXME: use the mode switching operator, this misses notifiers, messages. */
/* Just set paintmode flag... */
p->gpd->flag |= GP_DATA_STROKE_PAINTMODE;
/* disable other GP modes */
p->gpd->flag &= ~GP_DATA_STROKE_EDITMODE;
p->gpd->flag &= ~GP_DATA_STROKE_SCULPTMODE;
p->gpd->flag &= ~GP_DATA_STROKE_WEIGHTMODE;
/* set workspace mode */
ob->restore_mode = ob->mode;
ob->mode = OB_MODE_GPENCIL_PAINT;
/* redraw mode on screen */
WM_event_add_notifier(C, NC_SCENE | ND_MODE, NULL);
}
}
WM_event_add_notifier(C, NC_GPENCIL | NA_EDITED, NULL);
/* add a modal handler for this operator, so that we can then draw continuous strokes */
WM_event_add_modal_handler(C, op);
return OPERATOR_RUNNING_MODAL;
}
/* gpencil modal operator stores area, which can be removed while using it (like fullscreen) */
static bool gpencil_area_exists(bContext *C, ScrArea *sa_test)
{
bScreen *sc = CTX_wm_screen(C);
return (BLI_findindex(&sc->areabase, sa_test) != -1);
}
static tGPsdata *gpencil_stroke_begin(bContext *C, wmOperator *op)
{
tGPsdata *p = op->customdata;
/* we must check that we're still within the area that we're set up to work from
* otherwise we could crash (see bug #20586)
*/
if (CTX_wm_area(C) != p->sa) {
printf("\t\t\tGP - wrong area execution abort!\n");
p->status = GP_STATUS_ERROR;
}
/* printf("\t\tGP - start stroke\n"); */
/* we may need to set up paint env again if we're resuming */
/* XXX: watch it with the paintmode! in future,
* it'd be nice to allow changing paint-mode when in sketching-sessions */
if (gp_session_initdata(C, op, p))
gp_paint_initstroke(p, p->paintmode, CTX_data_depsgraph(C));
if (p->status != GP_STATUS_ERROR) {
p->status = GP_STATUS_PAINTING;
op->flag &= ~OP_IS_MODAL_CURSOR_REGION;
}
return op->customdata;
}
static void gpencil_stroke_end(wmOperator *op)
{
tGPsdata *p = op->customdata;
gp_paint_cleanup(p);
gpencil_undo_push(p->gpd);
gp_session_cleanup(p);
p->status = GP_STATUS_IDLING;
op->flag |= OP_IS_MODAL_CURSOR_REGION;
p->gpd = NULL;
p->gpl = NULL;
p->gpf = NULL;
}
/* Move last stroke in the listbase to the head to be drawn below all previous strokes in the layer */
static void gpencil_move_last_stroke_to_back(bContext *C)
{
/* move last stroke (the polygon) to head of the listbase stroke to draw on back of all previous strokes */
bGPdata *gpd = ED_gpencil_data_get_active(C);
bGPDlayer *gpl = BKE_gpencil_layer_getactive(gpd);
/* sanity checks */
if (ELEM(NULL, gpd, gpl, gpl->actframe)) {
return;
}
bGPDframe *gpf = gpl->actframe;
bGPDstroke *gps = gpf->strokes.last;
if (ELEM(NULL, gps)) {
return;
}
BLI_remlink(&gpf->strokes, gps);
BLI_insertlinkbefore(&gpf->strokes, gpf->strokes.first, gps);
}
/* add events for missing mouse movements when the artist draw very fast */
static void gpencil_add_missing_events(bContext *C, wmOperator *op, const wmEvent *event, tGPsdata *p)
{
Brush *brush = p->brush;
if (brush->gpencil_settings->input_samples == 0) {
return;
}
RegionView3D *rv3d = p->ar->regiondata;
float defaultpixsize = rv3d->pixsize * 1000.0f;
int samples = (GP_MAX_INPUT_SAMPLES - brush->gpencil_settings->input_samples + 1);
float thickness = (float)brush->size;
float pt[2], a[2], b[2];
float vec[3];
float scale = 1.0f;
/* get pixel scale */
gp_get_3d_reference(p, vec);
mul_m4_v3(rv3d->persmat, vec);
if (rv3d->is_persp) {
scale = vec[2] * defaultpixsize;
}
else {
scale = defaultpixsize;
}
/* The thickness of the brush is reduced of thickness to get overlap dots */
float dot_factor = 0.50f;
if (samples < 2) {
dot_factor = 0.05f;
}
else if (samples < 4) {
dot_factor = 0.10f;
}
else if (samples < 7) {
dot_factor = 0.3f;
}
else if (samples < 10) {
dot_factor = 0.4f;
}
float factor = ((thickness * dot_factor) / scale) * samples;
copy_v2fl_v2i(a, p->mvalo);
b[0] = event->mval[0] + 1;
b[1] = event->mval[1] + 1;
/* get distance in pixels */
float dist = len_v2v2(a, b);
/* for very small distances, add a half way point */
if (dist <= 2.0f) {
interp_v2_v2v2(pt, a, b, 0.5f);
sub_v2_v2v2(pt, b, pt);
/* create fake event */
gpencil_draw_apply_event(C, op, event, CTX_data_depsgraph(C),
(int)pt[0], (int)pt[1]);
}
else if (dist >= factor) {
int slices = 2 + (int)((dist - 1.0) / factor);
float n = 1.0f / slices;
for (int i = 1; i < slices; i++) {
interp_v2_v2v2(pt, a, b, n * i);
sub_v2_v2v2(pt, b, pt);
/* create fake event */
gpencil_draw_apply_event(C, op, event, CTX_data_depsgraph(C),
(int)pt[0], (int)pt[1]);
}
}
}
/* events handling during interactive drawing part of operator */
static int gpencil_draw_modal(bContext *C, wmOperator *op, const wmEvent *event)
{
tGPsdata *p = op->customdata;
ToolSettings *ts = CTX_data_tool_settings(C);
int estate = OPERATOR_PASS_THROUGH; /* default exit state - pass through to support MMB view nav, etc. */
/* if (event->type == NDOF_MOTION)
* return OPERATOR_PASS_THROUGH;
* -------------------------------
* [mce] Not quite what I was looking
* for, but a good start! GP continues to
* draw on the screen while the 3D mouse
* moves the viewpoint. Problem is that
* the stroke is converted to 3D only after
* it is finished. This approach should work
* better in tools that immediately apply
* in 3D space.
*/
if (p->status == GP_STATUS_IDLING) {
ARegion *ar = CTX_wm_region(C);
p->ar = ar;
}
/* we don't pass on key events, GP is used with key-modifiers - prevents Dkey to insert drivers */
if (ISKEYBOARD(event->type)) {
if (ELEM(event->type, LEFTARROWKEY, DOWNARROWKEY, RIGHTARROWKEY, UPARROWKEY, ZKEY)) {
/* allow some keys:
* - for frame changing [#33412]
* - for undo (during sketching sessions)
*/
}
else if (ELEM(event->type, PAD0, PAD1, PAD2, PAD3, PAD4, PAD5, PAD6, PAD7, PAD8, PAD9)) {
/* allow numpad keys so that camera/view manipulations can still take place
* - PAD0 in particular is really important for Grease Pencil drawing,
* as animators may be working "to camera", so having this working
* is essential for ensuring that they can quickly return to that view
*/
}
else if ((event->type == BKEY) && (event->val == KM_RELEASE)) {
/* Add Blank Frame
* - Since this operator is non-modal, we can just call it here, and keep going...
* - This operator is especially useful when animating
*/
WM_operator_name_call(C, "GPENCIL_OT_blank_frame_add", WM_OP_EXEC_DEFAULT, NULL);
estate = OPERATOR_RUNNING_MODAL;
}
else {
estate = OPERATOR_RUNNING_MODAL;
}
}
//printf("\tGP - handle modal event...\n");
/* exit painting mode (and/or end current stroke)
* NOTE: cannot do RIGHTMOUSE (as is standard for canceling) as that would break polyline [#32647]
*/
/* if polyline and release shift must cancel */
if ((ELEM(event->type, RETKEY, PADENTER, ESCKEY, SPACEKEY, EKEY)) ||
((p->paintmode == GP_PAINTMODE_DRAW_POLY) && (event->shift == 0)))
{
/* exit() ends the current stroke before cleaning up */
/* printf("\t\tGP - end of paint op + end of stroke\n"); */
/* if drawing polygon and enable on back, must move stroke */
if (ts) {
if ((ts->gpencil_flags & GP_TOOL_FLAG_PAINT_ONBACK) && (p->paintmode == GP_PAINTMODE_DRAW_POLY)) {
if (p->flags & GP_PAINTFLAG_STROKEADDED) {
gpencil_move_last_stroke_to_back(C);
}
}
}
p->status = GP_STATUS_DONE;
estate = OPERATOR_FINISHED;
}
/* toggle painting mode upon mouse-button movement
* - LEFTMOUSE = standard drawing (all) / straight line drawing (all) / polyline (toolbox only)
* - RIGHTMOUSE = polyline (hotkey) / eraser (all)
* (Disabling RIGHTMOUSE case here results in bugs like [#32647])
* also making sure we have a valid event value, to not exit too early
*/
if (ELEM(event->type, LEFTMOUSE, RIGHTMOUSE) && (ELEM(event->val, KM_PRESS, KM_RELEASE))) {
/* if painting, end stroke */
if (p->status == GP_STATUS_PAINTING) {
int sketch = 0;
/* basically, this should be mouse-button up = end stroke
* BUT, polyline drawing is an exception -- all knots should be added during one session
*/
sketch |= (p->paintmode == GP_PAINTMODE_DRAW_POLY);
if (sketch) {
/* end stroke only, and then wait to resume painting soon */
/* printf("\t\tGP - end stroke only\n"); */
gpencil_stroke_end(op);
/* If eraser mode is on, turn it off after the stroke finishes
* NOTE: This just makes it nicer to work with drawing sessions
*/
if (p->paintmode == GP_PAINTMODE_ERASER) {
p->paintmode = RNA_enum_get(op->ptr, "mode");
/* if the original mode was *still* eraser,
* we'll let it say for now, since this gives
* users an opportunity to have visual feedback
* when adjusting eraser size
*/
if (p->paintmode != GP_PAINTMODE_ERASER) {
/* turn off cursor...
* NOTE: this should be enough for now
* Just hiding this makes it seem like
* you can paint again...
*/
gpencil_draw_toggle_eraser_cursor(C, p, false);
}
}
/* we've just entered idling state, so this event was processed (but no others yet) */
estate = OPERATOR_RUNNING_MODAL;
/* stroke could be smoothed, send notifier to refresh screen */
WM_event_add_notifier(C, NC_GPENCIL | NA_EDITED, NULL);
}
else {
/* printf("\t\tGP - end of stroke + op\n"); */
/* if drawing polygon and enable on back, must move stroke */
if (ts) {
if ((ts->gpencil_flags & GP_TOOL_FLAG_PAINT_ONBACK) && (p->paintmode == GP_PAINTMODE_DRAW_POLY)) {
if (p->flags & GP_PAINTFLAG_STROKEADDED) {
gpencil_move_last_stroke_to_back(C);
}
}
}
/* drawing batch cache is dirty now */
gp_update_cache(p->gpd);
p->status = GP_STATUS_DONE;
estate = OPERATOR_FINISHED;
}
}
else if (event->val == KM_PRESS) {
bool in_bounds = false;
/* Check if we're outside the bounds of the active region
* NOTE: An exception here is that if launched from the toolbar,
* whatever region we're now in should become the new region
*/
if ((p->ar) && (p->ar->regiontype == RGN_TYPE_TOOLS)) {
/* Change to whatever region is now under the mouse */
ARegion *current_region = BKE_area_find_region_xy(p->sa, RGN_TYPE_ANY, event->x, event->y);
if (G.debug & G_DEBUG) {
printf("found alternative region %p (old was %p) - at %d %d (sa: %d %d -> %d %d)\n",
current_region, p->ar, event->x, event->y,
p->sa->totrct.xmin, p->sa->totrct.ymin, p->sa->totrct.xmax, p->sa->totrct.ymax);
}
if (current_region) {
/* Assume that since we found the cursor in here, it is in bounds
* and that this should be the region that we begin drawing in
*/
p->ar = current_region;
in_bounds = true;
}
else {
/* Out of bounds, or invalid in some other way */
p->status = GP_STATUS_ERROR;
estate = OPERATOR_CANCELLED;
if (G.debug & G_DEBUG)
printf("%s: Region under cursor is out of bounds, so cannot be drawn on\n", __func__);
}
}
else if (p->ar) {
rcti region_rect;
/* Perform bounds check using */
ED_region_visible_rect(p->ar, ®ion_rect);
in_bounds = BLI_rcti_isect_pt_v(®ion_rect, event->mval);
}
else {
/* No region */
p->status = GP_STATUS_ERROR;
estate = OPERATOR_CANCELLED;
if (G.debug & G_DEBUG)
printf("%s: No active region found in GP Paint session data\n", __func__);
}
if (in_bounds) {
/* Switch paintmode (temporarily if need be) based on which button was used
* NOTE: This is to make it more convenient to erase strokes when using drawing sessions
*/
if ((event->type == RIGHTMOUSE) || gpencil_is_tablet_eraser_active(event)) {
/* turn on eraser */
p->paintmode = GP_PAINTMODE_ERASER;
}
else if (event->type == LEFTMOUSE) {
/* restore drawmode to default */
p->paintmode = RNA_enum_get(op->ptr, "mode");
}
gpencil_draw_toggle_eraser_cursor(C, p, p->paintmode == GP_PAINTMODE_ERASER);
/* not painting, so start stroke (this should be mouse-button down) */
p = gpencil_stroke_begin(C, op);
if (p->status == GP_STATUS_ERROR) {
estate = OPERATOR_CANCELLED;
}
}
else if (p->status != GP_STATUS_ERROR) {
/* User clicked outside bounds of window while idling, so exit paintmode
* NOTE: Don't enter this case if an error occurred while finding the
* region (as above)
*/
/* if drawing polygon and enable on back, must move stroke */
if (ts) {
if ((ts->gpencil_flags & GP_TOOL_FLAG_PAINT_ONBACK) && (p->paintmode == GP_PAINTMODE_DRAW_POLY)) {
if (p->flags & GP_PAINTFLAG_STROKEADDED) {
gpencil_move_last_stroke_to_back(C);
}
}
}
p->status = GP_STATUS_DONE;
estate = OPERATOR_FINISHED;
}
}
else if (event->val == KM_RELEASE) {
p->status = GP_STATUS_IDLING;
op->flag |= OP_IS_MODAL_CURSOR_REGION;
}
}
/* handle mode-specific events */
if (p->status == GP_STATUS_PAINTING) {
/* handle painting mouse-movements? */
if (ELEM(event->type, MOUSEMOVE, INBETWEEN_MOUSEMOVE) || (p->flags & GP_PAINTFLAG_FIRSTRUN)) {
/* handle drawing event */
/* printf("\t\tGP - add point\n"); */
gpencil_add_missing_events(C, op, event, p);
gpencil_draw_apply_event(C, op, event, CTX_data_depsgraph(C), 0, 0);
/* finish painting operation if anything went wrong just now */
if (p->status == GP_STATUS_ERROR) {
printf("\t\t\t\tGP - add error done!\n");
estate = OPERATOR_CANCELLED;
}
else {
/* event handled, so just tag as running modal */
/* printf("\t\t\t\tGP - add point handled!\n"); */
estate = OPERATOR_RUNNING_MODAL;
}
}
/* eraser size */
else if ((p->paintmode == GP_PAINTMODE_ERASER) &&
ELEM(event->type, WHEELUPMOUSE, WHEELDOWNMOUSE, PADPLUSKEY, PADMINUS))
{
/* just resize the brush (local version)
* TODO: fix the hardcoded size jumps (set to make a visible difference) and hardcoded keys
*/
/* printf("\t\tGP - resize eraser\n"); */
switch (event->type) {
case WHEELDOWNMOUSE: /* larger */
case PADPLUSKEY:
p->radius += 5;
break;
case WHEELUPMOUSE: /* smaller */
case PADMINUS:
p->radius -= 5;
if (p->radius <= 0)
p->radius = 1;
break;
}
/* force refresh */
ED_region_tag_redraw(p->ar); /* just active area for now, since doing whole screen is too slow */
/* event handled, so just tag as running modal */
estate = OPERATOR_RUNNING_MODAL;
}
/* there shouldn't be any other events, but just in case there are, let's swallow them
* (i.e. to prevent problems with undo)
*/
else {
/* swallow event to save ourselves trouble */
estate = OPERATOR_RUNNING_MODAL;
}
}
/* gpencil modal operator stores area, which can be removed while using it (like fullscreen) */
if (0 == gpencil_area_exists(C, p->sa))
estate = OPERATOR_CANCELLED;
else {
/* update status indicators - cursor, header, etc. */
gpencil_draw_status_indicators(C, p);
gpencil_draw_cursor_set(p); /* cursor may have changed outside our control - T44084 */
}
/* process last operations before exiting */
switch (estate) {
case OPERATOR_FINISHED:
/* one last flush before we're done */
gpencil_draw_exit(C, op);
WM_event_add_notifier(C, NC_GPENCIL | NA_EDITED, NULL);
break;
case OPERATOR_CANCELLED:
gpencil_draw_exit(C, op);
break;
case OPERATOR_RUNNING_MODAL | OPERATOR_PASS_THROUGH:
/* event doesn't need to be handled */
#if 0
printf("unhandled event -> %d (mmb? = %d | mmv? = %d)\n",
event->type, event->type == MIDDLEMOUSE, event->type == MOUSEMOVE);
#endif
break;
}
/* return status code */
return estate;
}
/* ------------------------------- */
static const EnumPropertyItem prop_gpencil_drawmodes[] = {
{GP_PAINTMODE_DRAW, "DRAW", 0, "Draw Freehand", "Draw freehand stroke(s)"},
{GP_PAINTMODE_DRAW_STRAIGHT, "DRAW_STRAIGHT", 0, "Draw Straight Lines", "Draw straight line segment(s)"},
{GP_PAINTMODE_DRAW_POLY, "DRAW_POLY", 0, "Draw Poly Line", "Click to place endpoints of straight line segments (connected)"},
{GP_PAINTMODE_ERASER, "ERASER", 0, "Eraser", "Erase Grease Pencil strokes"},
{0, NULL, 0, NULL, NULL}
};
void GPENCIL_OT_draw(wmOperatorType *ot)
{
PropertyRNA *prop;
/* identifiers */
ot->name = "Grease Pencil Draw";
ot->idname = "GPENCIL_OT_draw";
ot->description = "Draw a new stroke in the active Grease Pencil Object";
/* api callbacks */
ot->exec = gpencil_draw_exec;
ot->invoke = gpencil_draw_invoke;
ot->modal = gpencil_draw_modal;
ot->cancel = gpencil_draw_cancel;
ot->poll = gpencil_draw_poll;
/* flags */
ot->flag = OPTYPE_UNDO | OPTYPE_BLOCKING;
/* settings for drawing */
ot->prop = RNA_def_enum(ot->srna, "mode", prop_gpencil_drawmodes, 0, "Mode", "Way to interpret mouse movements");
prop = RNA_def_collection_runtime(ot->srna, "stroke", &RNA_OperatorStrokeElement, "Stroke", "");
RNA_def_property_flag(prop, PROP_HIDDEN | PROP_SKIP_SAVE);
/* NOTE: wait for input is enabled by default, so that all UI code can work properly without needing users to know about this */
prop = RNA_def_boolean(ot->srna, "wait_for_input", true, "Wait for Input", "Wait for first click instead of painting immediately");
RNA_def_property_flag(prop, PROP_HIDDEN | PROP_SKIP_SAVE);
prop = RNA_def_boolean(ot->srna, "disable_straight", false, "No Straight lines", "Disable key for straight lines");
RNA_def_property_flag(prop, PROP_SKIP_SAVE);
prop = RNA_def_boolean(ot->srna, "disable_fill", false, "No Fill Areas", "Disable fill to use stroke as fill boundary");
RNA_def_property_flag(prop, PROP_SKIP_SAVE);
}
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