[quartz] Implement color font support.

1 files changed, 51 insertions, 10 deletions

diff --git a/src/cairo-quartz-font.c b/src/cairo-quartz-font.c
index 9e667e0d6..000a0e237 100644
--- a/src/cairo-quartz-font.c
+++ b/src/cairo-quartz-font.c
@@ -76,8 +76,10 @@ static const CGFloat font_scale = 1.0;
 
 #if MAC_OS_X_VERSION_MIN_REQUIRED < 1080
 #define FONT_ORIENTATION_HORIZONTAL kCTFontHorizontalOrientation
+#define FONT_COLOR_GLYPHS kCTFontTraitColorGlyphs
 #else
 #define FONT_ORIENTATION_HORIZONTAL kCTFontOrientationHorizontal
+#define FONT_COLOR_GLYPHS kCTFontColorGlyphsTrait
 #endif
 
 static void
@@ -410,7 +412,6 @@ _cairo_quartz_init_glyph_metrics (cairo_quartz_scaled_font_t *font,
     extents.y_bearing = - ymax;
     extents.width = xmax - xmin;
     extents.height = ymax - ymin;
-
     extents.x_advance = advance.width;
     extents.y_advance = advance.height;
 
@@ -522,9 +523,19 @@ _cairo_quartz_init_glyph_path (cairo_quartz_scaled_font_t *font,
     return CAIRO_STATUS_SUCCESS;
 }
 
+static cairo_bool_t
+_cairo_quartz_font_has_color_glyphs (void *abstract_font)
+{
+    cairo_quartz_scaled_font_t *face = (cairo_quartz_scaled_font_t*)abstract_font;
+    CTFontSymbolicTraits traits = CTFontGetSymbolicTraits (face->ctFont);
+    return traits & FONT_COLOR_GLYPHS;
+}
+
 static cairo_int_status_t
 _cairo_quartz_init_glyph_surface (cairo_quartz_scaled_font_t *font,
-				  cairo_scaled_glyph_t *scaled_glyph)
+				  cairo_scaled_glyph_t *scaled_glyph,
+				  cairo_scaled_glyph_info_t info,
+				 const cairo_color_t *fg_color)
 {
     cairo_int_status_t status = CAIRO_STATUS_SUCCESS;
     cairo_image_surface_t *surface = NULL;
@@ -538,6 +549,8 @@ _cairo_quartz_init_glyph_surface (cairo_quartz_scaled_font_t *font,
     CGAffineTransform textMatrix;
     CGRect glyphRect, glyphRectInt;
     CGPoint glyphOrigin;
+    cairo_bool_t is_color = info & CAIRO_SCALED_GLYPH_INFO_COLOR_SURFACE;
+    cairo_format_t format =  is_color ? CAIRO_FORMAT_ARGB32 : CAIRO_FORMAT_A8;
 
 #ifdef DEBUG
     fprintf (stderr, "[0x%04x] bearing: %f %f width %f height %f advances %f %f\n",
@@ -562,6 +575,19 @@ _cairo_quartz_init_glyph_surface (cairo_quartz_scaled_font_t *font,
 	return CAIRO_STATUS_SUCCESS;
     }
 
+/* Note: Certain opentype color fonts have the ability to provide a
+ * mixture of color and not-color glyphs. The Core Text API doesn't
+ * expose a way to query individual glyphs and at the level that that
+ * API is written it's not supposed to matter. The following code will
+ * cheerfully render any glyph requested onto the image surface. If
+ * the font is capable of color and
+ * COLOR_SCALED_GLYPH_INFO_COLOR_SURFACE is set then you get back a
+ * CAIRO_FORMAT_ARGB32 surface. If a foreground color is provided then
+ * the glyph will be drawn in that color, otherwise it will be black.
+ */
+    if (unlikely (is_color && ! _cairo_quartz_font_has_color_glyphs (font)))
+	return CAIRO_INT_STATUS_UNSUPPORTED;
+
     /* scale(1,-1) * font->base.scale * scale(1,-1) */
     textMatrix = CGAffineTransformMake (font->base.scale.xx,
 					-font->base.scale.yx,
@@ -587,37 +613,47 @@ _cairo_quartz_init_glyph_surface (cairo_quartz_scaled_font_t *font,
     width = glyphRectInt.size.width;
     height = glyphRectInt.size.height;
 
-    surface = (cairo_image_surface_t*) cairo_image_surface_create (CAIRO_FORMAT_A8, width, height);
+    surface = (cairo_image_surface_t*) cairo_image_surface_create (format, width, height);
     if (surface->base.status)
 	return surface->base.status;
 
     if (surface->width != 0 && surface->height != 0) {
+	CGColorSpaceRef colorspace = is_color ? CGColorSpaceCreateDeviceRGB () : NULL;
+	CGBitmapInfo bitinfo = is_color ? kCGBitmapByteOrder32Host | kCGImageAlphaPremultipliedFirst : kCGImageAlphaOnly;
+
 	CGContextRef cgContext = CGBitmapContextCreate (surface->data,
 							surface->width,
 							surface->height,
 							8,
 							surface->stride,
-							NULL,
-							kCGImageAlphaOnly);
+							colorspace,
+							bitinfo);
 
 	if (cgContext == NULL) {
 	    cairo_surface_destroy (&surface->base);
 	    return _cairo_error (CAIRO_STATUS_NO_MEMORY);
 	}
 
+	if (fg_color)
+	    CGContextSetRGBFillColor (cgContext, fg_color->red, fg_color->green, fg_color->blue, fg_color->alpha);
 	_cairo_quartz_set_antialiasing (cgContext, font->base.options.antialias);
 	CGContextSetAlpha (cgContext, 1.0);
 	CGContextTranslateCTM (cgContext, -glyphOrigin.x, -glyphOrigin.y);
 	CGContextConcatCTM (cgContext, textMatrix);
 	CTFontDrawGlyphs (font->ctFont, &glyph, &CGPointZero, 1, cgContext);
 	CGContextRelease (cgContext);
+	CGColorSpaceRelease (colorspace);
     }
 
     cairo_surface_set_device_offset (&surface->base,
 				     - glyphOrigin.x,
 				     height + glyphOrigin.y);
+    cairo_surface_mark_dirty (&surface->base);
 
-    _cairo_scaled_glyph_set_surface (scaled_glyph, &font->base, surface);
+    if (is_color)
+	_cairo_scaled_glyph_set_color_surface (scaled_glyph, &font->base, surface, fg_color != NULL);
+    else
+	_cairo_scaled_glyph_set_surface (scaled_glyph, &font->base, surface);
 
     return status;
 }
@@ -637,8 +673,10 @@ _cairo_quartz_scaled_glyph_init (void *abstract_font,
     if (!status && (info & CAIRO_SCALED_GLYPH_INFO_PATH))
 	status = _cairo_quartz_init_glyph_path (font, scaled_glyph);
 
-    if (!status && (info & CAIRO_SCALED_GLYPH_INFO_SURFACE))
-	status = _cairo_quartz_init_glyph_surface (font, scaled_glyph);
+    if (!status && (info & (CAIRO_SCALED_GLYPH_INFO_SURFACE |
+			    CAIRO_SCALED_GLYPH_INFO_COLOR_SURFACE )))
+	status = _cairo_quartz_init_glyph_surface (font, scaled_glyph,
+						   info, foreground_color);
 
     return status;
 }
@@ -694,8 +732,11 @@ static const cairo_scaled_font_backend_t _cairo_quartz_scaled_font_backend = {
     _cairo_quartz_ucs4_to_index,
     _cairo_quartz_load_truetype_table,
     NULL, /*index_to_ucs4*/
-}; /* is_synthetic, index_to_glyph_name, load_type1_data, has_color_glyphs */
-
+    NULL, /* is_synthetic */
+    NULL, /* index_to_glyph_name */
+    NULL, /* load_type1_data */
+    _cairo_quartz_font_has_color_glyphs
+};
 /*
  * private methods that the quartz surface uses
  */