UI: add own icon rasterizer

Use software drawing, cache to an image at the requested pixel size.

4 files changed, 155 insertions, 35 deletions

diff --git a/source/blender/blenkernel/BKE_icons.h b/source/blender/blenkernel/BKE_icons.h
index 47cac895645..fb40e5be281 100644
--- a/source/blender/blenkernel/BKE_icons.h
+++ b/source/blender/blenkernel/BKE_icons.h
@@ -71,6 +71,7 @@ struct Icon_Geom {
 
 typedef struct Icon Icon;
 
+struct ImBuf;
 struct PreviewImage;
 struct ID;
 
@@ -148,6 +149,10 @@ struct PreviewImage *BKE_previewimg_cached_thumbnail_read(
 void BKE_previewimg_cached_release(const char *name);
 void BKE_previewimg_cached_release_pointer(struct PreviewImage *prv);
 
+struct ImBuf *BKE_icon_geom_rasterize(
+        const struct Icon_Geom *geom,
+        const unsigned int size_x, const unsigned int size_y);
+
 #define ICON_RENDER_DEFAULT_HEIGHT 32
 
 #endif /*  __BKE_ICONS_H__ */
diff --git a/source/blender/blenkernel/CMakeLists.txt b/source/blender/blenkernel/CMakeLists.txt
index d90831605b5..91915bf679a 100644
--- a/source/blender/blenkernel/CMakeLists.txt
+++ b/source/blender/blenkernel/CMakeLists.txt
@@ -116,6 +116,7 @@ set(SRC
 	intern/gpencil.c
 	intern/group.c
 	intern/icons.c
+	intern/icons_rasterize.c
 	intern/idcode.c
 	intern/idprop.c
 	intern/image.c
diff --git a/source/blender/blenkernel/intern/icons_rasterize.c b/source/blender/blenkernel/intern/icons_rasterize.c
new file mode 100644
index 00000000000..bb6ef38f8f7
--- /dev/null
+++ b/source/blender/blenkernel/intern/icons_rasterize.c
@@ -0,0 +1,131 @@
+/*
+ * ***** 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.
+ *
+ * ***** END GPL LICENSE BLOCK *****
+ *
+ */
+
+/** \file blender/blenkernel/intern/icons_rasterize.c
+ *  \ingroup bke
+ */
+#include "MEM_guardedalloc.h"
+
+#include "BLI_utildefines.h"
+#include "BLI_bitmap_draw_2d.h"
+#include "BLI_math_geom.h"
+
+#include "IMB_imbuf.h"
+#include "IMB_imbuf_types.h"
+
+#include "BKE_icons.h"
+
+#include "BLI_strict_flags.h"
+
+struct UserRasterInfo {
+	int pt[3][2];
+	const uint *color;
+	/* only for smooth shading */
+	struct {
+		float pt_fl[3][2];
+		uint color_u[3][4];
+	} smooth;
+	int   rect_size[2];
+	uint *rect;
+};
+
+static void tri_fill_flat(int x, int x_end, int y, void *user_data)
+{
+	struct UserRasterInfo *data = user_data;
+	uint *p = &data->rect[(y * data->rect_size[1]) + x];
+	uint col = data->color[0];
+	while (x++ != x_end) {
+		*p++ = col;
+	}
+}
+
+static void tri_fill_smooth(int x, int x_end, int y, void *user_data)
+{
+	struct UserRasterInfo *data = user_data;
+	uint *p = &data->rect[(y * data->rect_size[1]) + x];
+	float pt_step_fl[2] = {(float)x, (float)y};
+	while (x++ != x_end) {
+		float w[3];
+		barycentric_weights_v2_clamped(UNPACK3(data->smooth.pt_fl), pt_step_fl, w);
+
+		uint col_u[4] = {0, 0, 0, 0};
+		for (uint corner = 0; corner < 3; corner++) {
+			for (uint chan = 0; chan < 4; chan++) {
+				col_u[chan] += data->smooth.color_u[corner][chan] * (uint)(w[corner] * 255.0f);
+			}
+		}
+		union {
+			uint  as_u32;
+			uchar as_bytes[4];
+		} col;
+		col.as_bytes[0] = (uchar)(col_u[0] / 255);
+		col.as_bytes[1] = (uchar)(col_u[1] / 255);
+		col.as_bytes[2] = (uchar)(col_u[2] / 255);
+		col.as_bytes[3] = (uchar)(col_u[3] / 255);
+		*p++ = col.as_u32;
+
+		pt_step_fl[0] += 1.0f;
+	}
+}
+
+ImBuf *BKE_icon_geom_rasterize(
+        const struct Icon_Geom *geom,
+        const unsigned int size_x, const unsigned int size_y)
+{
+	const int coords_len = geom->coords_len;
+
+	const uchar (*pos)[2] = geom->coords;
+	const uint   *col = (void *)geom->colors;
+
+	/* TODO(campbell): Currently rasterizes to fixed size, then scales.
+	 * Should rasterize to double size for eg instead. */
+	const int rect_size[2] = {256, 256};
+
+	ImBuf *ibuf = IMB_allocImBuf((uint)rect_size[0], (uint)rect_size[1], 32, IB_rect);
+
+	struct UserRasterInfo data;
+
+	data.rect_size[0] = rect_size[0];
+	data.rect_size[1] = rect_size[1];
+
+	data.rect = ibuf->rect;
+
+	for (int t = 0; t < coords_len; t += 1, pos += 3, col += 3) {
+		ARRAY_SET_ITEMS(data.pt[0], UNPACK2(pos[0]));
+		ARRAY_SET_ITEMS(data.pt[1], UNPACK2(pos[1]));
+		ARRAY_SET_ITEMS(data.pt[2], UNPACK2(pos[2]));
+		data.color = col;
+		if ((col[0] == col[1]) && (col[0] == col[2])) {
+			BLI_bitmap_draw_2d_tri_v2i(UNPACK3(data.pt), tri_fill_flat, &data);
+		}
+		else {
+			ARRAY_SET_ITEMS(data.smooth.pt_fl[0], UNPACK2_EX((float), data.pt[0], ));
+			ARRAY_SET_ITEMS(data.smooth.pt_fl[1], UNPACK2_EX((float), data.pt[1], ));
+			ARRAY_SET_ITEMS(data.smooth.pt_fl[2], UNPACK2_EX((float), data.pt[2], ));
+			ARRAY_SET_ITEMS(data.smooth.color_u[0], UNPACK4_EX((uint), ((uchar *)(col + 0)), ));
+			ARRAY_SET_ITEMS(data.smooth.color_u[1], UNPACK4_EX((uint), ((uchar *)(col + 1)), ));
+			ARRAY_SET_ITEMS(data.smooth.color_u[2], UNPACK4_EX((uint), ((uchar *)(col + 2)), ));
+			BLI_bitmap_draw_2d_tri_v2i(UNPACK3(data.pt), tri_fill_smooth, &data);
+		}
+	}
+	IMB_scaleImBuf(ibuf, size_x, size_y);
+	return ibuf;
+}
diff --git a/source/blender/editors/interface/interface_icons.c b/source/blender/editors/interface/interface_icons.c
index 6bcdc2f9266..ec255ed73a0 100644
--- a/source/blender/editors/interface/interface_icons.c
+++ b/source/blender/editors/interface/interface_icons.c
@@ -110,7 +110,7 @@ typedef struct DrawInfo {
 			VectorDrawFunc func;
 		} vector;
 		struct {
-			Gwn_Batch *batch;
+			ImBuf *image_cache;
 		} geom;
 		struct {
 			IconImage *image;
@@ -748,8 +748,8 @@ void UI_icons_free_drawinfo(void *drawinfo)
 			}
 		}
 		else if (di->type == ICON_TYPE_GEOM) {
-			if (di->data.geom.batch) {
-				GWN_BATCH_DISCARD_SAFE(di->data.geom.batch);
+			if (di->data.geom.image_cache) {
+				IMB_freeImBuf(di->data.geom.image_cache);
 			}
 		}
 
@@ -760,7 +760,7 @@ void UI_icons_free_drawinfo(void *drawinfo)
 /**
  * #Icon.data_type and #Icon.obj
  */
-static DrawInfo *icon_create_drawinfo(int icon_data_type, void *icon_obj)
+static DrawInfo *icon_create_drawinfo(int icon_data_type)
 {
 	DrawInfo *di = NULL;
 
@@ -771,21 +771,6 @@ static DrawInfo *icon_create_drawinfo(int icon_data_type, void *icon_obj)
 	}
 	else if (icon_data_type == ICON_DATA_GEOM) {
 		di->type = ICON_TYPE_GEOM;
-
-		struct Icon_Geom *geom = icon_obj;
-		static Gwn_VertFormat format = {0};
-		static struct { uint pos, color; } attr_id;
-		if (format.attrib_ct == 0) {
-			attr_id.pos = GWN_vertformat_attr_add(&format, "pos", GWN_COMP_U8, 2, GWN_FETCH_INT_TO_FLOAT_UNIT);
-			attr_id.color = GWN_vertformat_attr_add(&format, "color", GWN_COMP_U8, 4, GWN_FETCH_INT_TO_FLOAT_UNIT);
-		}
-		Gwn_VertBuf *vbo = GWN_vertbuf_create_with_format(&format);
-		GWN_vertbuf_data_alloc(vbo, geom->coords_len * 3);
-		GWN_vertbuf_attr_fill(vbo, attr_id.pos, geom->coords);
-		GWN_vertbuf_attr_fill(vbo, attr_id.color, geom->colors);
-
-		Gwn_Batch *batch = GWN_batch_create_ex(GWN_PRIM_TRIS, vbo, NULL, GWN_BATCH_OWNS_VBO);
-		di->data.geom.batch = batch;
 	}
 	else {
 		BLI_assert(0);
@@ -799,7 +784,7 @@ static DrawInfo *icon_ensure_drawinfo(Icon *icon)
 	if (icon->drawinfo) {
 		return icon->drawinfo;
 	}
-	DrawInfo *di = icon_create_drawinfo(icon->obj_type, icon->obj);
+	DrawInfo *di = icon_create_drawinfo(icon->obj_type);
 	icon->drawinfo = di;
 	icon->drawinfo_free = UI_icons_free_drawinfo;
 	return di;
@@ -1241,24 +1226,22 @@ static void icon_draw_size(
 		/* We need to flush widget base first to ensure correct ordering. */
 		UI_widgetbase_draw_cache_flush();
 
-		gpuPushMatrix();
-		gpuTranslate2f(x, y);
-		gpuScale2f(w, h);
-
+		/* This could re-generate often if rendered at different sizes in the one interface.
+		 * TODO(campbell): support caching multiple sizes. */
+		ImBuf *ibuf = di->data.geom.image_cache;
+		if ((ibuf == NULL) ||
+		    (ibuf->x != w) ||
+		    (ibuf->y != h))
 		{
-			struct Gwn_Batch *batch = di->data.geom.batch;
-			GWN_batch_program_set_builtin(batch, GPU_SHADER_2D_SMOOTH_COLOR_UNIFORM_ALPHA);
-			GWN_batch_uniform_1f(batch, "alpha", 1.0f / UI_PIXEL_AA_JITTER);
-
-			for (uint i = 0; i < UI_PIXEL_AA_JITTER; i += 1) {
-				gpuTranslate2f(ui_pixel_jitter[i][0] / w, ui_pixel_jitter[i][1] / h);
-				GWN_batch_draw(batch);
-				gpuTranslate2f(-ui_pixel_jitter[i][0] / w, -ui_pixel_jitter[i][1] / h);
+			if (ibuf) {
+				IMB_freeImBuf(ibuf);
 			}
-			GWN_batch_program_use_end(batch);
+			ibuf = BKE_icon_geom_rasterize(icon->obj, w, h);
+			di->data.geom.image_cache = ibuf;
 		}
-
-		gpuPopMatrix();
+		glBlendFuncSeparate(GL_ONE, GL_ONE_MINUS_SRC_ALPHA, GL_ONE, GL_ONE_MINUS_SRC_ALPHA);
+		icon_draw_rect(x, y, w, h, aspect, w, h, ibuf->rect, alpha, rgb, is_preview);
+		glBlendFuncSeparate(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA, GL_ONE, GL_ONE_MINUS_SRC_ALPHA);
 	}
 	else if (di->type == ICON_TYPE_TEXTURE) {
 		/* texture image use premul alpha for correct scaling */