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+/*
+ * Copyright © 2022 Behdad Esfahbod
+ *
+ * This is part of HarfBuzz, a text shaping library.
+ *
+ * Permission is hereby granted, without written agreement and without
+ * license or royalty fees, to use, copy, modify, and distribute this
+ * software and its documentation for any purpose, provided that the
+ * above copyright notice and the following two paragraphs appear in
+ * all copies of this software.
+ *
+ * IN NO EVENT SHALL THE COPYRIGHT HOLDER BE LIABLE TO ANY PARTY FOR
+ * DIRECT, INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES
+ * ARISING OUT OF THE USE OF THIS SOFTWARE AND ITS DOCUMENTATION, EVEN
+ * IF THE COPYRIGHT HOLDER HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH
+ * DAMAGE.
+ *
+ * THE COPYRIGHT HOLDER SPECIFICALLY DISCLAIMS ANY WARRANTIES, INCLUDING,
+ * BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
+ * FITNESS FOR A PARTICULAR PURPOSE. THE SOFTWARE PROVIDED HEREUNDER IS
+ * ON AN "AS IS" BASIS, AND THE COPYRIGHT HOLDER HAS NO OBLIGATION TO
+ * PROVIDE MAINTENANCE, SUPPORT, UPDATES, ENHANCEMENTS, OR MODIFICATIONS.
+ */
+
+#ifndef HB_FT_COLR_HH
+#define HB_FT_COLR_HH
+
+#include "hb.hh"
+
+#include "hb-paint-extents.hh"
+
+#include FT_COLOR_H
+
+
+static hb_paint_composite_mode_t
+_hb_ft_paint_composite_mode (FT_Composite_Mode mode)
+{
+ switch (mode)
+ {
+ case FT_COLR_COMPOSITE_CLEAR: return HB_PAINT_COMPOSITE_MODE_CLEAR;
+ case FT_COLR_COMPOSITE_SRC: return HB_PAINT_COMPOSITE_MODE_SRC;
+ case FT_COLR_COMPOSITE_DEST: return HB_PAINT_COMPOSITE_MODE_DEST;
+ case FT_COLR_COMPOSITE_SRC_OVER: return HB_PAINT_COMPOSITE_MODE_SRC_OVER;
+ case FT_COLR_COMPOSITE_DEST_OVER: return HB_PAINT_COMPOSITE_MODE_DEST_OVER;
+ case FT_COLR_COMPOSITE_SRC_IN: return HB_PAINT_COMPOSITE_MODE_SRC_IN;
+ case FT_COLR_COMPOSITE_DEST_IN: return HB_PAINT_COMPOSITE_MODE_DEST_IN;
+ case FT_COLR_COMPOSITE_SRC_OUT: return HB_PAINT_COMPOSITE_MODE_SRC_OUT;
+ case FT_COLR_COMPOSITE_DEST_OUT: return HB_PAINT_COMPOSITE_MODE_DEST_OUT;
+ case FT_COLR_COMPOSITE_SRC_ATOP: return HB_PAINT_COMPOSITE_MODE_SRC_ATOP;
+ case FT_COLR_COMPOSITE_DEST_ATOP: return HB_PAINT_COMPOSITE_MODE_DEST_ATOP;
+ case FT_COLR_COMPOSITE_XOR: return HB_PAINT_COMPOSITE_MODE_XOR;
+ case FT_COLR_COMPOSITE_PLUS: return HB_PAINT_COMPOSITE_MODE_PLUS;
+ case FT_COLR_COMPOSITE_SCREEN: return HB_PAINT_COMPOSITE_MODE_SCREEN;
+ case FT_COLR_COMPOSITE_OVERLAY: return HB_PAINT_COMPOSITE_MODE_OVERLAY;
+ case FT_COLR_COMPOSITE_DARKEN: return HB_PAINT_COMPOSITE_MODE_DARKEN;
+ case FT_COLR_COMPOSITE_LIGHTEN: return HB_PAINT_COMPOSITE_MODE_LIGHTEN;
+ case FT_COLR_COMPOSITE_COLOR_DODGE: return HB_PAINT_COMPOSITE_MODE_COLOR_DODGE;
+ case FT_COLR_COMPOSITE_COLOR_BURN: return HB_PAINT_COMPOSITE_MODE_COLOR_BURN;
+ case FT_COLR_COMPOSITE_HARD_LIGHT: return HB_PAINT_COMPOSITE_MODE_HARD_LIGHT;
+ case FT_COLR_COMPOSITE_SOFT_LIGHT: return HB_PAINT_COMPOSITE_MODE_SOFT_LIGHT;
+ case FT_COLR_COMPOSITE_DIFFERENCE: return HB_PAINT_COMPOSITE_MODE_DIFFERENCE;
+ case FT_COLR_COMPOSITE_EXCLUSION: return HB_PAINT_COMPOSITE_MODE_EXCLUSION;
+ case FT_COLR_COMPOSITE_MULTIPLY: return HB_PAINT_COMPOSITE_MODE_MULTIPLY;
+ case FT_COLR_COMPOSITE_HSL_HUE: return HB_PAINT_COMPOSITE_MODE_HSL_HUE;
+ case FT_COLR_COMPOSITE_HSL_SATURATION: return HB_PAINT_COMPOSITE_MODE_HSL_SATURATION;
+ case FT_COLR_COMPOSITE_HSL_COLOR: return HB_PAINT_COMPOSITE_MODE_HSL_COLOR;
+ case FT_COLR_COMPOSITE_HSL_LUMINOSITY: return HB_PAINT_COMPOSITE_MODE_HSL_LUMINOSITY;
+
+ case FT_COLR_COMPOSITE_MAX: HB_FALLTHROUGH;
+ default: return HB_PAINT_COMPOSITE_MODE_CLEAR;
+ }
+}
+
+typedef struct hb_ft_paint_context_t hb_ft_paint_context_t;
+
+static void
+_hb_ft_paint (hb_ft_paint_context_t *c,
+ FT_OpaquePaint opaque_paint);
+
+struct hb_ft_paint_context_t
+{
+ hb_ft_paint_context_t (const hb_ft_font_t *ft_font,
+ hb_font_t *font,
+ hb_paint_funcs_t *paint_funcs, void *paint_data,
+ FT_Color *palette,
+ unsigned palette_index,
+ hb_color_t foreground) :
+ ft_font (ft_font), font(font),
+ funcs (paint_funcs), data (paint_data),
+ palette (palette), palette_index (palette_index), foreground (foreground) {}
+
+ void recurse (FT_OpaquePaint paint)
+ {
+ if (unlikely (depth_left <= 0 || edge_count <= 0)) return;
+ depth_left--;
+ edge_count--;
+ _hb_ft_paint (this, paint);
+ depth_left++;
+ }
+
+ const hb_ft_font_t *ft_font;
+ hb_font_t *font;
+ hb_paint_funcs_t *funcs;
+ void *data;
+ FT_Color *palette;
+ unsigned palette_index;
+ hb_color_t foreground;
+ int depth_left = HB_MAX_NESTING_LEVEL;
+ int edge_count = HB_COLRV1_MAX_EDGE_COUNT;
+};
+
+static unsigned
+_hb_ft_color_line_get_color_stops (hb_color_line_t *color_line,
+ void *color_line_data,
+ unsigned int start,
+ unsigned int *count,
+ hb_color_stop_t *color_stops,
+ void *user_data)
+{
+ FT_ColorLine *cl = (FT_ColorLine *) color_line_data;
+ hb_ft_paint_context_t *c = (hb_ft_paint_context_t *) user_data;
+
+ if (count)
+ {
+ FT_ColorStop stop;
+ unsigned wrote = 0;
+ FT_ColorStopIterator iter = cl->color_stop_iterator;
+
+ if (start >= cl->color_stop_iterator.num_color_stops)
+ {
+ *count = 0;
+ return cl->color_stop_iterator.num_color_stops;
+ }
+
+ while (cl->color_stop_iterator.current_color_stop < start)
+ FT_Get_Colorline_Stops(c->ft_font->ft_face,
+ &stop,
+ &cl->color_stop_iterator);
+
+ while (count && *count &&
+ FT_Get_Colorline_Stops(c->ft_font->ft_face,
+ &stop,
+ &cl->color_stop_iterator))
+ {
+ // https://github.com/harfbuzz/harfbuzz/issues/4013
+ if (sizeof stop.stop_offset == 2)
+ color_stops->offset = stop.stop_offset / 16384.f;
+ else
+ color_stops->offset = stop.stop_offset / 65536.f;
+
+ color_stops->is_foreground = stop.color.palette_index == 0xFFFF;
+ if (color_stops->is_foreground)
+ color_stops->color = HB_COLOR (hb_color_get_blue (c->foreground),
+ hb_color_get_green (c->foreground),
+ hb_color_get_red (c->foreground),
+ (hb_color_get_alpha (c->foreground) * stop.color.alpha) >> 14);
+ else
+ {
+ hb_color_t color;
+ if (c->funcs->custom_palette_color (c->data, stop.color.palette_index, &color))
+ {
+ color_stops->color = HB_COLOR (hb_color_get_blue (color),
+ hb_color_get_green (color),
+ hb_color_get_red (color),
+ (hb_color_get_alpha (color) * stop.color.alpha) >> 14);
+ }
+ else
+ {
+ FT_Color ft_color = c->palette[stop.color.palette_index];
+ color_stops->color = HB_COLOR (ft_color.blue,
+ ft_color.green,
+ ft_color.red,
+ (ft_color.alpha * stop.color.alpha) >> 14);
+ }
+ }
+
+ color_stops++;
+ wrote++;
+ }
+
+ *count = wrote;
+
+ // reset the iterator for next time
+ cl->color_stop_iterator = iter;
+ }
+
+ return cl->color_stop_iterator.num_color_stops;
+}
+
+static hb_paint_extend_t
+_hb_ft_color_line_get_extend (hb_color_line_t *color_line,
+ void *color_line_data,
+ void *user_data)
+{
+ FT_ColorLine *c = (FT_ColorLine *) color_line_data;
+ switch (c->extend)
+ {
+ default:
+ case FT_COLR_PAINT_EXTEND_PAD: return HB_PAINT_EXTEND_PAD;
+ case FT_COLR_PAINT_EXTEND_REPEAT: return HB_PAINT_EXTEND_REPEAT;
+ case FT_COLR_PAINT_EXTEND_REFLECT: return HB_PAINT_EXTEND_REFLECT;
+ }
+}
+
+void
+_hb_ft_paint (hb_ft_paint_context_t *c,
+ FT_OpaquePaint opaque_paint)
+{
+ FT_Face ft_face = c->ft_font->ft_face;
+ FT_COLR_Paint paint;
+ if (!FT_Get_Paint (ft_face, opaque_paint, &paint))
+ return;
+
+ switch (paint.format)
+ {
+ case FT_COLR_PAINTFORMAT_COLR_LAYERS:
+ {
+ FT_OpaquePaint other_paint = {0};
+ while (FT_Get_Paint_Layers (ft_face,
+ &paint.u.colr_layers.layer_iterator,
+ &other_paint))
+ {
+ c->funcs->push_group (c->data);
+ c->recurse (other_paint);
+ c->funcs->pop_group (c->data, HB_PAINT_COMPOSITE_MODE_SRC_OVER);
+ }
+ }
+ break;
+ case FT_COLR_PAINTFORMAT_SOLID:
+ {
+ bool is_foreground = paint.u.solid.color.palette_index == 0xFFFF;
+ hb_color_t color;
+ if (is_foreground)
+ color = HB_COLOR (hb_color_get_blue (c->foreground),
+ hb_color_get_green (c->foreground),
+ hb_color_get_red (c->foreground),
+ (hb_color_get_alpha (c->foreground) * paint.u.solid.color.alpha) >> 14);
+ else
+ {
+ if (c->funcs->custom_palette_color (c->data, paint.u.solid.color.palette_index, &color))
+ {
+ color = HB_COLOR (hb_color_get_blue (color),
+ hb_color_get_green (color),
+ hb_color_get_red (color),
+ (hb_color_get_alpha (color) * paint.u.solid.color.alpha) >> 14);
+ }
+ else
+ {
+ FT_Color ft_color = c->palette[paint.u.solid.color.palette_index];
+ color = HB_COLOR (ft_color.blue,
+ ft_color.green,
+ ft_color.red,
+ (ft_color.alpha * paint.u.solid.color.alpha) >> 14);
+ }
+ }
+ c->funcs->color (c->data, is_foreground, color);
+ }
+ break;
+ case FT_COLR_PAINTFORMAT_LINEAR_GRADIENT:
+ {
+ hb_color_line_t cl = {
+ &paint.u.linear_gradient.colorline,
+ _hb_ft_color_line_get_color_stops, c,
+ _hb_ft_color_line_get_extend, nullptr
+ };
+
+ c->funcs->linear_gradient (c->data, &cl,
+ paint.u.linear_gradient.p0.x / 65536.f,
+ paint.u.linear_gradient.p0.y / 65536.f,
+ paint.u.linear_gradient.p1.x / 65536.f,
+ paint.u.linear_gradient.p1.y / 65536.f,
+ paint.u.linear_gradient.p2.x / 65536.f,
+ paint.u.linear_gradient.p2.y / 65536.f);
+ }
+ break;
+ case FT_COLR_PAINTFORMAT_RADIAL_GRADIENT:
+ {
+ hb_color_line_t cl = {
+ &paint.u.linear_gradient.colorline,
+ _hb_ft_color_line_get_color_stops, c,
+ _hb_ft_color_line_get_extend, nullptr
+ };
+
+ c->funcs->radial_gradient (c->data, &cl,
+ paint.u.radial_gradient.c0.x / 65536.f,
+ paint.u.radial_gradient.c0.y / 65536.f,
+ paint.u.radial_gradient.r0 / 65536.f,
+ paint.u.radial_gradient.c1.x / 65536.f,
+ paint.u.radial_gradient.c1.y / 65536.f,
+ paint.u.radial_gradient.r1 / 65536.f);
+ }
+ break;
+ case FT_COLR_PAINTFORMAT_SWEEP_GRADIENT:
+ {
+ hb_color_line_t cl = {
+ &paint.u.linear_gradient.colorline,
+ _hb_ft_color_line_get_color_stops, c,
+ _hb_ft_color_line_get_extend, nullptr
+ };
+
+ c->funcs->sweep_gradient (c->data, &cl,
+ paint.u.sweep_gradient.center.x / 65536.f,
+ paint.u.sweep_gradient.center.y / 65536.f,
+ (paint.u.sweep_gradient.start_angle / 65536.f + 1) * HB_PI,
+ (paint.u.sweep_gradient.end_angle / 65536.f + 1) * HB_PI);
+ }
+ break;
+ case FT_COLR_PAINTFORMAT_GLYPH:
+ {
+ c->funcs->push_inverse_root_transform (c->data, c->font);
+ c->ft_font->lock.unlock ();
+ c->funcs->push_clip_glyph (c->data, paint.u.glyph.glyphID, c->font);
+ c->ft_font->lock.lock ();
+ c->funcs->push_root_transform (c->data, c->font);
+ c->recurse (paint.u.glyph.paint);
+ c->funcs->pop_transform (c->data);
+ c->funcs->pop_clip (c->data);
+ c->funcs->pop_transform (c->data);
+ }
+ break;
+ case FT_COLR_PAINTFORMAT_COLR_GLYPH:
+ {
+ FT_OpaquePaint other_paint = {0};
+ if (FT_Get_Color_Glyph_Paint (ft_face, paint.u.colr_glyph.glyphID,
+ FT_COLOR_NO_ROOT_TRANSFORM,
+ &other_paint))
+ {
+ bool has_clip_box;
+ FT_ClipBox clip_box;
+ has_clip_box = FT_Get_Color_Glyph_ClipBox (ft_face, paint.u.colr_glyph.glyphID, &clip_box);
+
+ if (has_clip_box)
+ {
+ /* The FreeType ClipBox is in scaled coordinates, whereas we need
+ * unscaled clipbox here. Oh well...
+ */
+
+ float upem = c->font->face->get_upem ();
+ float xscale = upem / (c->font->x_scale ? c->font->x_scale : upem);
+ float yscale = upem / (c->font->y_scale ? c->font->y_scale : upem);
+
+ c->funcs->push_clip_rectangle (c->data,
+ clip_box.bottom_left.x * xscale,
+ clip_box.bottom_left.y * yscale,
+ clip_box.top_right.x * xscale,
+ clip_box.top_right.y * yscale);
+ }
+
+ c->recurse (other_paint);
+
+ if (has_clip_box)
+ c->funcs->pop_clip (c->data);
+ }
+ }
+ break;
+ case FT_COLR_PAINTFORMAT_TRANSFORM:
+ {
+ c->funcs->push_transform (c->data,
+ paint.u.transform.affine.xx / 65536.f,
+ paint.u.transform.affine.yx / 65536.f,
+ paint.u.transform.affine.xy / 65536.f,
+ paint.u.transform.affine.yy / 65536.f,
+ paint.u.transform.affine.dx / 65536.f,
+ paint.u.transform.affine.dy / 65536.f);
+ c->recurse (paint.u.transform.paint);
+ c->funcs->pop_transform (c->data);
+ }
+ break;
+ case FT_COLR_PAINTFORMAT_TRANSLATE:
+ {
+ float dx = paint.u.translate.dx / 65536.f;
+ float dy = paint.u.translate.dy / 65536.f;
+
+ bool p1 = c->funcs->push_translate (c->data, dx, dy);
+ c->recurse (paint.u.translate.paint);
+ if (p1) c->funcs->pop_transform (c->data);
+ }
+ break;
+ case FT_COLR_PAINTFORMAT_SCALE:
+ {
+ float dx = paint.u.scale.center_x / 65536.f;
+ float dy = paint.u.scale.center_y / 65536.f;
+ float sx = paint.u.scale.scale_x / 65536.f;
+ float sy = paint.u.scale.scale_y / 65536.f;
+
+ bool p1 = c->funcs->push_translate (c->data, +dx, +dy);
+ bool p2 = c->funcs->push_scale (c->data, sx, sy);
+ bool p3 = c->funcs->push_translate (c->data, -dx, -dy);
+ c->recurse (paint.u.scale.paint);
+ if (p3) c->funcs->pop_transform (c->data);
+ if (p2) c->funcs->pop_transform (c->data);
+ if (p1) c->funcs->pop_transform (c->data);
+ }
+ break;
+ case FT_COLR_PAINTFORMAT_ROTATE:
+ {
+ float dx = paint.u.rotate.center_x / 65536.f;
+ float dy = paint.u.rotate.center_y / 65536.f;
+ float a = paint.u.rotate.angle / 65536.f;
+
+ bool p1 = c->funcs->push_translate (c->data, +dx, +dy);
+ bool p2 = c->funcs->push_rotate (c->data, a);
+ bool p3 = c->funcs->push_translate (c->data, -dx, -dy);
+ c->recurse (paint.u.rotate.paint);
+ if (p3) c->funcs->pop_transform (c->data);
+ if (p2) c->funcs->pop_transform (c->data);
+ if (p1) c->funcs->pop_transform (c->data);
+ }
+ break;
+ case FT_COLR_PAINTFORMAT_SKEW:
+ {
+ float dx = paint.u.skew.center_x / 65536.f;
+ float dy = paint.u.skew.center_y / 65536.f;
+ float sx = paint.u.skew.x_skew_angle / 65536.f;
+ float sy = paint.u.skew.y_skew_angle / 65536.f;
+
+ bool p1 = c->funcs->push_translate (c->data, +dx, +dy);
+ bool p2 = c->funcs->push_skew (c->data, sx, sy);
+ bool p3 = c->funcs->push_translate (c->data, -dx, -dy);
+ c->recurse (paint.u.skew.paint);
+ if (p3) c->funcs->pop_transform (c->data);
+ if (p2) c->funcs->pop_transform (c->data);
+ if (p1) c->funcs->pop_transform (c->data);
+ }
+ break;
+ case FT_COLR_PAINTFORMAT_COMPOSITE:
+ {
+ c->recurse (paint.u.composite.backdrop_paint);
+ c->funcs->push_group (c->data);
+ c->recurse (paint.u.composite.source_paint);
+ c->funcs->pop_group (c->data, _hb_ft_paint_composite_mode (paint.u.composite.composite_mode));
+ }
+ break;
+
+ case FT_COLR_PAINT_FORMAT_MAX: break;
+ default: HB_FALLTHROUGH;
+ case FT_COLR_PAINTFORMAT_UNSUPPORTED: break;
+ }
+}
+
+
+static bool
+hb_ft_paint_glyph_colr (hb_font_t *font,
+ void *font_data,
+ hb_codepoint_t gid,
+ hb_paint_funcs_t *paint_funcs, void *paint_data,
+ unsigned int palette_index,
+ hb_color_t foreground,
+ void *user_data)
+{
+ const hb_ft_font_t *ft_font = (const hb_ft_font_t *) font_data;
+ FT_Face ft_face = ft_font->ft_face;
+
+ /* Face is locked. */
+
+ FT_Error error;
+ FT_Color* palette;
+ FT_LayerIterator iterator;
+
+ FT_Bool have_layers;
+ FT_UInt layer_glyph_index;
+ FT_UInt layer_color_index;
+
+ error = FT_Palette_Select(ft_face, palette_index, &palette);
+ if (error)
+ palette = NULL;
+
+ /* COLRv1 */
+ FT_OpaquePaint paint = {0};
+ if (FT_Get_Color_Glyph_Paint (ft_face, gid,
+ FT_COLOR_NO_ROOT_TRANSFORM,
+ &paint))
+ {
+ hb_ft_paint_context_t c (ft_font, font,
+ paint_funcs, paint_data,
+ palette, palette_index, foreground);
+
+ bool is_bounded = true;
+ FT_ClipBox clip_box;
+ if (FT_Get_Color_Glyph_ClipBox (ft_face, gid, &clip_box))
+ {
+ c.funcs->push_clip_rectangle (c.data,
+ clip_box.bottom_left.x +
+ roundf (hb_min (font->slant_xy * clip_box.bottom_left.y,
+ font->slant_xy * clip_box.top_left.y)),
+ clip_box.bottom_left.y,
+ clip_box.top_right.x +
+ roundf (hb_max (font->slant_xy * clip_box.bottom_right.y,
+ font->slant_xy * clip_box.top_right.y)),
+ clip_box.top_right.y);
+ }
+ else
+ {
+
+ auto *extents_funcs = hb_paint_extents_get_funcs ();
+ hb_paint_extents_context_t extents_data;
+ hb_ft_paint_context_t ce (ft_font, font,
+ extents_funcs, &extents_data,
+ palette, palette_index, foreground);
+ ce.funcs->push_root_transform (ce.data, font);
+ ce.recurse (paint);
+ ce.funcs->pop_transform (ce.data);
+ hb_extents_t extents = extents_data.get_extents ();
+ is_bounded = extents_data.is_bounded ();
+
+ c.funcs->push_clip_rectangle (c.data,
+ extents.xmin,
+ extents.ymin,
+ extents.xmax,
+ extents.ymax);
+ }
+
+ c.funcs->push_root_transform (c.data, font);
+
+ if (is_bounded)
+ c.recurse (paint);
+
+ c.funcs->pop_transform (c.data);
+ c.funcs->pop_clip (c.data);
+
+ return true;
+ }
+
+ /* COLRv0 */
+ iterator.p = NULL;
+ have_layers = FT_Get_Color_Glyph_Layer(ft_face,
+ gid,
+ &layer_glyph_index,
+ &layer_color_index,
+ &iterator);
+
+ if (palette && have_layers)
+ {
+ do
+ {
+ hb_bool_t is_foreground = true;
+ hb_color_t color = foreground;
+
+ if ( layer_color_index != 0xFFFF )
+ {
+ FT_Color layer_color = palette[layer_color_index];
+ color = HB_COLOR (layer_color.blue,
+ layer_color.green,
+ layer_color.red,
+ layer_color.alpha);
+ is_foreground = false;
+ }
+
+ ft_font->lock.unlock ();
+ paint_funcs->push_clip_glyph (paint_data, layer_glyph_index, font);
+ ft_font->lock.lock ();
+ paint_funcs->color (paint_data, is_foreground, color);
+ paint_funcs->pop_clip (paint_data);
+
+ } while (FT_Get_Color_Glyph_Layer(ft_face,
+ gid,
+ &layer_glyph_index,
+ &layer_color_index,
+ &iterator));
+ return true;
+ }
+
+ return false;
+}
+
+
+#endif /* HB_FT_COLR_HH */
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