1 files changed, 567 insertions, 0 deletions

diff --git a/gfx/harfbuzz/src/hb-ft-colr.hh b/gfx/harfbuzz/src/hb-ft-colr.hh
new file mode 100644
index 0000000000..fa5712f9b3
--- /dev/null
+++ b/gfx/harfbuzz/src/hb-ft-colr.hh
@@ -0,0 +1,567 @@
+/*
+ * 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 */