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diff --git a/gfx/cairo/cairo/src/cairo-compositor-private.h b/gfx/cairo/cairo/src/cairo-compositor-private.h
--- a/gfx/cairo/cairo/src/cairo-compositor-private.h
+++ b/gfx/cairo/cairo/src/cairo-compositor-private.h
@@ -85,7 +85,8 @@ struct cairo_compositor {
cairo_scaled_font_t *scaled_font,
cairo_glyph_t *glyphs,
int num_glyphs,
- cairo_bool_t overlap);
+ cairo_bool_t overlap,
+ cairo_bool_t permit_subpixel_antialiasing);
};
struct cairo_mask_compositor {
diff --git a/gfx/cairo/cairo/src/cairo-compositor.c b/gfx/cairo/cairo/src/cairo-compositor.c
--- a/gfx/cairo/cairo/src/cairo-compositor.c
+++ b/gfx/cairo/cairo/src/cairo-compositor.c
@@ -248,7 +248,8 @@ cairo_int_status_t
compositor = compositor->delegate;
status = compositor->glyphs (compositor, &extents,
- scaled_font, glyphs, num_glyphs, overlap);
+ scaled_font, glyphs, num_glyphs, overlap,
+ surface->permit_subpixel_antialiasing);
compositor = compositor->delegate;
} while (status == CAIRO_INT_STATUS_UNSUPPORTED);
diff --git a/gfx/cairo/cairo/src/cairo-no-compositor.c b/gfx/cairo/cairo/src/cairo-no-compositor.c
--- a/gfx/cairo/cairo/src/cairo-no-compositor.c
+++ b/gfx/cairo/cairo/src/cairo-no-compositor.c
@@ -91,7 +91,8 @@ static cairo_int_status_t
cairo_scaled_font_t *scaled_font,
cairo_glyph_t *glyphs,
int num_glyphs,
- cairo_bool_t overlap)
+ cairo_bool_t overlap,
+ cairo_bool_t permit_subpixel_antialiasing)
{
ASSERT_NOT_REACHED;
return CAIRO_INT_STATUS_NOTHING_TO_DO;
diff --git a/gfx/cairo/cairo/src/cairo-quartz-surface.c b/gfx/cairo/cairo/src/cairo-quartz-surface.c
--- a/gfx/cairo/cairo/src/cairo-quartz-surface.c
+++ b/gfx/cairo/cairo/src/cairo-quartz-surface.c
@@ -1947,7 +1947,8 @@ static cairo_int_status_t
cairo_scaled_font_t *scaled_font,
cairo_glyph_t *glyphs,
int num_glyphs,
- cairo_bool_t overlap)
+ cairo_bool_t overlap,
+ cairo_bool_t permit_subpixel_antialiasing)
{
CGAffineTransform textTransform, invTextTransform;
CGGlyph glyphs_static[CAIRO_STACK_ARRAY_LENGTH (CGSize)];
@@ -1963,6 +1964,7 @@ static cairo_int_status_t
CGFontRef cgfref = NULL;
cairo_bool_t didForceFontSmoothing = FALSE;
+ cairo_antialias_t effective_antialiasing;
if (cairo_scaled_font_get_type (scaled_font) != CAIRO_FONT_TYPE_QUARTZ)
return CAIRO_INT_STATUS_UNSUPPORTED;
@@ -1983,7 +1985,12 @@ static cairo_int_status_t
CGContextSetFont (state.cgMaskContext, cgfref);
CGContextSetFontSize (state.cgMaskContext, 1.0);
- switch (scaled_font->options.antialias) {
+ effective_antialiasing = scaled_font->options.antialias;
+ if (effective_antialiasing == CAIRO_ANTIALIAS_SUBPIXEL &&
+ !permit_subpixel_antialiasing) {
+ effective_antialiasing = CAIRO_ANTIALIAS_GRAY;
+ }
+ switch (effective_antialiasing) {
case CAIRO_ANTIALIAS_SUBPIXEL:
case CAIRO_ANTIALIAS_BEST:
CGContextSetShouldAntialias (state.cgMaskContext, TRUE);
diff --git a/gfx/cairo/cairo/src/cairo-surface-private.h b/gfx/cairo/cairo/src/cairo-surface-private.h
--- a/gfx/cairo/cairo/src/cairo-surface-private.h
+++ b/gfx/cairo/cairo/src/cairo-surface-private.h
@@ -71,6 +71,7 @@ struct _cairo_surface {
unsigned has_font_options : 1;
unsigned owns_device : 1;
unsigned is_vector : 1;
+ unsigned permit_subpixel_antialiasing : 1;
cairo_user_data_array_t user_data;
cairo_user_data_array_t mime_data;
diff --git a/gfx/cairo/cairo/src/cairo-surface.c b/gfx/cairo/cairo/src/cairo-surface.c
--- a/gfx/cairo/cairo/src/cairo-surface.c
+++ b/gfx/cairo/cairo/src/cairo-surface.c
@@ -115,6 +115,7 @@ const cairo_surface_t name = { \
FALSE, /* has_font_options */ \
FALSE, /* owns_device */ \
FALSE, /* is_vector */ \
+ FALSE, /* permit_subpixel_antialiasing */ \
{ 0, 0, 0, NULL, }, /* user_data */ \
{ 0, 0, 0, NULL, }, /* mime_data */ \
{ 1.0, 0.0, 0.0, 1.0, 0.0, 0.0 }, /* device_transform */ \
@@ -421,6 +422,7 @@ void
surface->serial = 0;
surface->damage = NULL;
surface->owns_device = (device != NULL);
+ surface->permit_subpixel_antialiasing = TRUE;
_cairo_user_data_array_init (&surface->user_data);
_cairo_user_data_array_init (&surface->mime_data);
@@ -452,6 +454,8 @@ static void
_cairo_surface_set_font_options (surface, &options);
}
+ surface->permit_subpixel_antialiasing = other->permit_subpixel_antialiasing;
+
cairo_surface_set_fallback_resolution (surface,
other->x_fallback_resolution,
other->y_fallback_resolution);
@@ -1619,6 +1623,51 @@ cairo_surface_get_font_options (cairo_su
}
slim_hidden_def (cairo_surface_get_font_options);
+/**
+ * cairo_surface_set_subpixel_antialiasing:
+ * @surface: a #cairo_surface_t
+ *
+ * Sets whether the surface permits subpixel antialiasing. By default,
+ * surfaces permit subpixel antialiasing.
+ *
+ * Enabling subpixel antialiasing for CONTENT_COLOR_ALPHA surfaces generally
+ * requires that the pixels in the areas under a subpixel antialiasing
+ * operation already be opaque.
+ **/
+void
+cairo_surface_set_subpixel_antialiasing (cairo_surface_t *surface,
+ cairo_subpixel_antialiasing_t enabled)
+{
+ if (surface->status)
+ return;
+
+ if (surface->finished) {
+ _cairo_surface_set_error (surface, CAIRO_STATUS_SURFACE_FINISHED);
+ return;
+ }
+
+ surface->permit_subpixel_antialiasing =
+ enabled == CAIRO_SUBPIXEL_ANTIALIASING_ENABLED;
+}
+
+/**
+ * cairo_surface_get_subpixel_antialiasing:
+ * @surface: a #cairo_surface_t
+ *
+ * Gets whether the surface supports subpixel antialiasing. By default,
+ * CAIRO_CONTENT_COLOR surfaces support subpixel antialiasing but other
+ * surfaces do not.
+ **/
+cairo_subpixel_antialiasing_t
+cairo_surface_get_subpixel_antialiasing (cairo_surface_t *surface)
+{
+ if (surface->status)
+ return CAIRO_SUBPIXEL_ANTIALIASING_DISABLED;
+
+ return surface->permit_subpixel_antialiasing ?
+ CAIRO_SUBPIXEL_ANTIALIASING_ENABLED : CAIRO_SUBPIXEL_ANTIALIASING_DISABLED;
+}
+
cairo_status_t
_cairo_surface_flush (cairo_surface_t *surface, unsigned flags)
{
diff --git a/gfx/cairo/cairo/src/cairo-xcb-private.h b/gfx/cairo/cairo/src/cairo-xcb-private.h
--- a/gfx/cairo/cairo/src/cairo-xcb-private.h
+++ b/gfx/cairo/cairo/src/cairo-xcb-private.h
@@ -453,7 +453,8 @@ cairo_private cairo_int_status_t
cairo_scaled_font_t *scaled_font,
cairo_glyph_t *glyphs,
int num_glyphs,
- cairo_bool_t overlap);
+ cairo_bool_t overlap,
+ cairo_bool_t permit_subpixel_antialiasing);
cairo_private void
_cairo_xcb_surface_scaled_font_fini (cairo_scaled_font_t *scaled_font);
diff --git a/gfx/cairo/cairo/src/cairo-xcb-surface-render.c b/gfx/cairo/cairo/src/cairo-xcb-surface-render.c
--- a/gfx/cairo/cairo/src/cairo-xcb-surface-render.c
+++ b/gfx/cairo/cairo/src/cairo-xcb-surface-render.c
@@ -4816,7 +4816,8 @@ cairo_int_status_t
cairo_scaled_font_t *scaled_font,
cairo_glyph_t *glyphs,
int num_glyphs,
- cairo_bool_t overlap)
+ cairo_bool_t overlap,
+ cairo_bool_t permit_subpixel_antialiasing)
{
cairo_xcb_surface_t *surface = (cairo_xcb_surface_t *) composite->surface;
cairo_operator_t op = composite->op;
diff --git a/gfx/cairo/cairo/src/cairo-xcb-surface.c b/gfx/cairo/cairo/src/cairo-xcb-surface.c
--- a/gfx/cairo/cairo/src/cairo-xcb-surface.c
+++ b/gfx/cairo/cairo/src/cairo-xcb-surface.c
@@ -912,7 +912,8 @@ static cairo_int_status_t
cairo_scaled_font_t *scaled_font,
cairo_glyph_t *glyphs,
int num_glyphs,
- cairo_bool_t overlap)
+ cairo_bool_t overlap,
+ cairo_bool_t permit_subpixel_antialiasing)
{
cairo_xcb_surface_t *surface = (cairo_xcb_surface_t *) extents->surface;
cairo_surface_t *fallback = _cairo_xcb_surface_fallback (surface, extents);
diff --git a/gfx/cairo/cairo/src/cairo.h b/gfx/cairo/cairo/src/cairo.h
--- a/gfx/cairo/cairo/src/cairo.h
+++ b/gfx/cairo/cairo/src/cairo.h
@@ -2573,6 +2573,26 @@ cairo_surface_show_page (cairo_surface_t
cairo_public cairo_bool_t
cairo_surface_has_show_text_glyphs (cairo_surface_t *surface);
+/**
+ * _cairo_subpixel_antialiasing_t:
+ * @CAIRO_SUBPIXEL_ANTIALIASING_ENABLED: subpixel antialiasing is enabled
+ * for this surface.
+ * @CAIRO_SUBPIXEL_ANTIALIASING_DISABLED: subpixel antialiasing is disabled
+ * for this surface.
+ */
+typedef enum _cairo_subpixel_antialiasing_t {
+ CAIRO_SUBPIXEL_ANTIALIASING_ENABLED,
+ CAIRO_SUBPIXEL_ANTIALIASING_DISABLED
+} cairo_subpixel_antialiasing_t;
+
+cairo_public void
+cairo_surface_set_subpixel_antialiasing (cairo_surface_t *surface,
+ cairo_subpixel_antialiasing_t enabled);
+
+cairo_public cairo_subpixel_antialiasing_t
+cairo_surface_get_subpixel_antialiasing (cairo_surface_t *surface);
+
+
/* Image-surface functions */
cairo_public cairo_surface_t *
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