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pjs/gfx/cairo/quartz-cglayers.patch

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changeset: 42959:e1964291f8ff
user: Robert O'Callahan <robert@ocallahan.org>
date: Tue Jun 01 11:33:23 2010 +1200
summary: Bug 568189. Implement CGLayer-backed cairo-quartz surfaces. r=jrmuizel
diff --git a/gfx/cairo/cairo/src/cairo-quartz-private.h b/gfx/cairo/cairo/src/cairo-quartz-private.h
--- a/gfx/cairo/cairo/src/cairo-quartz-private.h
+++ b/gfx/cairo/cairo/src/cairo-quartz-private.h
@@ -57,16 +57,21 @@ typedef struct cairo_quartz_surface {
/**
* If non-null, this is a CGImage representing the contents of the surface.
* We clear this out before any painting into the surface, so that we
* don't force a copy to be created.
*/
CGImageRef bitmapContextImage;
+ /**
+ * If non-null, this is the CGLayer for the surface.
+ */
+ CGLayerRef cgLayer;
+
cairo_rectangle_int_t extents;
} cairo_quartz_surface_t;
typedef struct cairo_quartz_image_surface {
cairo_surface_t base;
cairo_rectangle_int_t extents;
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
@@ -1110,18 +1110,17 @@ CreateRepeatingRadialGradientFunction (c
static void
DataProviderReleaseCallback (void *info, const void *data, size_t size)
{
cairo_surface_t *surface = (cairo_surface_t *) info;
cairo_surface_destroy (surface);
}
static cairo_status_t
-_cairo_surface_to_cgimage (cairo_surface_t *target,
- cairo_surface_t *source,
+_cairo_surface_to_cgimage (cairo_surface_t *source,
CGImageRef *image_out)
{
cairo_status_t status = CAIRO_STATUS_SUCCESS;
cairo_surface_type_t stype = cairo_surface_get_type (source);
cairo_image_surface_t *isurf;
CGImageRef image;
void *image_extra;
@@ -1267,17 +1266,17 @@ _cairo_quartz_cairo_repeating_surface_pa
return CAIRO_INT_STATUS_UNSUPPORTED;
spattern = (cairo_surface_pattern_t *) apattern;
pat_surf = spattern->surface;
is_bounded = _cairo_surface_get_extents (pat_surf, &extents);
assert (is_bounded);
- status = _cairo_surface_to_cgimage ((cairo_surface_t*) dest, pat_surf, &image);
+ status = _cairo_surface_to_cgimage (pat_surf, &image);
if (status)
return status;
if (image == NULL)
return CAIRO_INT_STATUS_NOTHING_TO_DO;
info = malloc(sizeof(SurfacePatternDrawInfo));
if (!info)
return CAIRO_STATUS_NO_MEMORY;
@@ -1339,33 +1338,39 @@ _cairo_quartz_cairo_repeating_surface_pa
}
typedef enum {
DO_SOLID,
DO_SHADING,
DO_PATTERN,
DO_IMAGE,
DO_TILED_IMAGE,
+ DO_LAYER,
DO_UNSUPPORTED,
DO_NOTHING
} cairo_quartz_action_t;
/* State used during a drawing operation. */
typedef struct {
CGContextRef context;
cairo_quartz_action_t action;
- // Used with DO_SHADING, DO_IMAGE and DO_TILED_IMAGE
+ // Used with DO_SHADING, DO_IMAGE, DO_TILED_IMAGE and DO_LAYER
CGAffineTransform transform;
// Used with DO_IMAGE and DO_TILED_IMAGE
CGImageRef image;
cairo_surface_t *imageSurface;
+
+ // Used with DO_IMAGE, DO_TILED_IMAGE and DO_LAYER
CGRect imageRect;
+ // Used with DO_LAYER
+ CGLayerRef layer;
+
// Used with DO_SHADING
CGShadingRef shading;
// Used with DO_PATTERN
CGPatternRef pattern;
} cairo_quartz_drawing_state_t;
static void
@@ -1423,17 +1428,17 @@ _cairo_quartz_setup_fallback_source (cai
_cairo_pattern_transform (&pattern.base,
&fallback->device_transform_inverse);
status = _cairo_surface_paint (fallback,
CAIRO_OPERATOR_SOURCE,
&pattern.base, NULL);
}
#endif
- status = _cairo_surface_to_cgimage (&surface->base, fallback, &img);
+ status = _cairo_surface_to_cgimage (fallback, &img);
if (status) {
state->action = DO_UNSUPPORTED;
return;
}
if (img == NULL) {
state->action = DO_NOTHING;
return;
}
@@ -1624,16 +1629,17 @@ _cairo_quartz_setup_state (cairo_quartz_
{
CGContextRef context = surface->cgContext;
cairo_quartz_drawing_state_t state;
cairo_status_t status;
state.context = context;
state.image = NULL;
state.imageSurface = NULL;
+ state.layer = NULL;
state.shading = NULL;
state.pattern = NULL;
_cairo_quartz_surface_will_change (surface);
// Save before we change the pattern, colorspace, etc. so that
// we can restore and make sure that quartz releases our
// pattern (which may be stack allocated)
@@ -1689,33 +1695,43 @@ _cairo_quartz_setup_state (cairo_quartz_
CGImageRef img;
cairo_matrix_t m = spat->base.matrix;
cairo_rectangle_int_t extents;
CGAffineTransform xform;
CGRect srcRect;
cairo_fixed_t fw, fh;
cairo_bool_t is_bounded;
- status = _cairo_surface_to_cgimage ((cairo_surface_t *) surface, pat_surf, &img);
+ cairo_matrix_invert(&m);
+ _cairo_quartz_cairo_matrix_to_quartz (&m, &state.transform);
+
+ if (cairo_surface_get_type (pat_surf) == CAIRO_SURFACE_TYPE_QUARTZ) {
+ cairo_quartz_surface_t *quartz_surf = (cairo_quartz_surface_t *) pat_surf;
+ if (quartz_surf->cgLayer && source->extend == CAIRO_EXTEND_NONE) {
+ state.imageRect = CGRectMake (0, 0, quartz_surf->extents.width, quartz_surf->extents.height);
+ state.layer = quartz_surf->cgLayer;
+ state.action = DO_LAYER;
+ return state;
+ }
+ }
+
+ status = _cairo_surface_to_cgimage (pat_surf, &img);
if (status) {
state.action = DO_UNSUPPORTED;
return state;
}
if (img == NULL) {
state.action = DO_NOTHING;
return state;
}
CGContextSetRGBFillColor (surface->cgContext, 0, 0, 0, 1);
state.image = img;
- cairo_matrix_invert(&m);
- _cairo_quartz_cairo_matrix_to_quartz (&m, &state.transform);
-
is_bounded = _cairo_surface_get_extents (pat_surf, &extents);
assert (is_bounded);
if (source->extend == CAIRO_EXTEND_NONE) {
state.imageRect = CGRectMake (0, 0, extents.width, extents.height);
state.action = DO_IMAGE;
return state;
}
@@ -1820,33 +1836,48 @@ _cairo_quartz_teardown_state (cairo_quar
CGContextRestoreGState(state->context);
}
static void
_cairo_quartz_draw_image (cairo_quartz_drawing_state_t *state, cairo_operator_t op)
{
- assert (state && state->image && (state->action == DO_IMAGE || state->action == DO_TILED_IMAGE));
+ assert (state &&
+ ((state->image && (state->action == DO_IMAGE || state->action == DO_TILED_IMAGE)) ||
+ (state->layer && state->action == DO_LAYER)));
CGContextConcatCTM (state->context, state->transform);
CGContextTranslateCTM (state->context, 0, state->imageRect.size.height);
CGContextScaleCTM (state->context, 1, -1);
- if (state->action == DO_IMAGE) {
- CGContextDrawImage (state->context, state->imageRect, state->image);
+ if (state->action == DO_TILED_IMAGE) {
+ CGContextDrawTiledImagePtr (state->context, state->imageRect, state->image);
+ /* no need to worry about unbounded operators, since tiled images
+ fill the entire clip region */
+ } else {
+ if (state->action == DO_LAYER) {
+ /* Note that according to Apple docs it's completely legal
+ * to draw a CGLayer to any CGContext, even one it wasn't
+ * created for.
+ */
+ CGContextDrawLayerAtPoint (state->context, state->imageRect.origin,
+ state->layer);
+ } else {
+ CGContextDrawImage (state->context, state->imageRect, state->image);
+ }
+
if (!_cairo_operator_bounded_by_source (op)) {
CGContextBeginPath (state->context);
CGContextAddRect (state->context, state->imageRect);
CGContextAddRect (state->context, CGContextGetClipBoundingBox (state->context));
CGContextSetRGBFillColor (state->context, 0, 0, 0, 0);
CGContextEOFillPath (state->context);
}
- } else
- CGContextDrawTiledImagePtr (state->context, state->imageRect, state->image);
+ }
}
/*
* get source/dest image implementation
*/
/* Read the image from the surface's front buffer */
@@ -1971,95 +2002,153 @@ _cairo_quartz_surface_finish (void *abst
surface->imageSurfaceEquiv = NULL;
}
if (surface->imageData) {
free (surface->imageData);
surface->imageData = NULL;
}
+ if (surface->cgLayer) {
+ CGLayerRelease (surface->cgLayer);
+ }
+
return CAIRO_STATUS_SUCCESS;
}
static cairo_status_t
-_cairo_quartz_surface_acquire_source_image (void *abstract_surface,
- cairo_image_surface_t **image_out,
- void **image_extra)
+_cairo_quartz_surface_acquire_image (void *abstract_surface,
+ cairo_image_surface_t **image_out,
+ void **image_extra)
{
cairo_int_status_t status;
cairo_quartz_surface_t *surface = (cairo_quartz_surface_t *) abstract_surface;
- //ND((stderr, "%p _cairo_quartz_surface_acquire_source_image\n", surface));
+ *image_extra = NULL;
+
+ /* ND((stderr, "%p _cairo_quartz_surface_acquire_image\n", surface)); */
status = _cairo_quartz_get_image (surface, image_out);
+
+ if (status == CAIRO_INT_STATUS_UNSUPPORTED && surface->cgLayer) {
+ /* copy the layer into a Quartz bitmap context so we can get the data */
+ cairo_surface_t *tmp =
+ cairo_quartz_surface_create (CAIRO_CONTENT_COLOR_ALPHA,
+ surface->extents.width,
+ surface->extents.height);
+ cairo_quartz_surface_t *tmp_surface = (cairo_quartz_surface_t *) tmp;
+
+ /* if surface creation failed, we won't have a Quartz surface here */
+ if (cairo_surface_get_type (tmp) == CAIRO_SURFACE_TYPE_QUARTZ &&
+ tmp_surface->imageSurfaceEquiv) {
+ CGContextSaveGState (tmp_surface->cgContext);
+ CGContextTranslateCTM (tmp_surface->cgContext, 0, surface->extents.height);
+ CGContextScaleCTM (tmp_surface->cgContext, 1, -1);
+ /* Note that according to Apple docs it's completely legal
+ * to draw a CGLayer to any CGContext, even one it wasn't
+ * created for.
+ */
+ CGContextDrawLayerAtPoint (tmp_surface->cgContext,
+ CGPointMake (0.0, 0.0),
+ surface->cgLayer);
+ CGContextRestoreGState (tmp_surface->cgContext);
+
+ *image_out = (cairo_image_surface_t*)
+ cairo_surface_reference(tmp_surface->imageSurfaceEquiv);
+ *image_extra = tmp;
+ } else {
+ cairo_surface_destroy (tmp);
+ }
+ }
+
if (status)
return _cairo_error (CAIRO_STATUS_NO_MEMORY);
- *image_extra = NULL;
-
return CAIRO_STATUS_SUCCESS;
}
static void
_cairo_quartz_surface_release_source_image (void *abstract_surface,
cairo_image_surface_t *image,
void *image_extra)
{
cairo_surface_destroy ((cairo_surface_t *) image);
+
+ if (image_extra) {
+ cairo_surface_destroy ((cairo_surface_t *) image_extra);
+ }
}
static cairo_status_t
_cairo_quartz_surface_acquire_dest_image (void *abstract_surface,
cairo_rectangle_int_t *interest_rect,
cairo_image_surface_t **image_out,
cairo_rectangle_int_t *image_rect,
void **image_extra)
{
cairo_quartz_surface_t *surface = (cairo_quartz_surface_t *) abstract_surface;
- cairo_int_status_t status;
ND((stderr, "%p _cairo_quartz_surface_acquire_dest_image\n", surface));
- _cairo_quartz_surface_will_change (surface);
-
- status = _cairo_quartz_get_image (surface, image_out);
- if (status)
- return _cairo_error (CAIRO_STATUS_NO_MEMORY);
-
*image_rect = surface->extents;
*image_extra = NULL;
- return CAIRO_STATUS_SUCCESS;
+ _cairo_quartz_surface_will_change (surface);
+
+ return _cairo_quartz_surface_acquire_image (abstract_surface,
+ image_out, image_extra);
}
static void
_cairo_quartz_surface_release_dest_image (void *abstract_surface,
cairo_rectangle_int_t *interest_rect,
cairo_image_surface_t *image,
cairo_rectangle_int_t *image_rect,
void *image_extra)
{
- //cairo_quartz_surface_t *surface = (cairo_quartz_surface_t *) abstract_surface;
-
- //ND((stderr, "%p _cairo_quartz_surface_release_dest_image\n", surface));
+ /* ND((stderr, "%p _cairo_quartz_surface_release_dest_image\n", surface)); */
cairo_surface_destroy ((cairo_surface_t *) image);
+
+ if (image_extra) {
+ /* we need to write the data from the temp surface back to the layer */
+ cairo_quartz_surface_t *surface = (cairo_quartz_surface_t *) abstract_surface;
+ cairo_quartz_surface_t *tmp_surface = (cairo_quartz_surface_t *) image_extra;
+ CGImageRef img;
+ cairo_status_t status = _cairo_surface_to_cgimage (&tmp_surface->base, &img);
+ if (status) {
+ cairo_surface_destroy (&tmp_surface->base);
+ return;
+ }
+
+ CGContextSaveGState (surface->cgContext);
+ CGContextTranslateCTM (surface->cgContext, 0, surface->extents.height);
+ CGContextScaleCTM (surface->cgContext, 1, -1);
+ CGContextDrawImage (surface->cgContext,
+ CGRectMake (0.0, 0.0, surface->extents.width, surface->extents.height),
+ img);
+ CGContextRestoreGState (surface->cgContext);
+
+ cairo_surface_destroy (&tmp_surface->base);
+ }
}
static cairo_surface_t *
_cairo_quartz_surface_create_similar (void *abstract_surface,
cairo_content_t content,
int width,
int height)
{
- /*cairo_quartz_surface_t *surface = (cairo_quartz_surface_t *) abstract_surface;*/
-
+ cairo_quartz_surface_t *surface = (cairo_quartz_surface_t *) abstract_surface;
cairo_format_t format;
+ if (surface->cgLayer)
+ return cairo_quartz_surface_create_cg_layer (abstract_surface, width, height);
+
if (content == CAIRO_CONTENT_COLOR_ALPHA)
format = CAIRO_FORMAT_ARGB32;
else if (content == CAIRO_CONTENT_COLOR)
format = CAIRO_FORMAT_RGB24;
else if (content == CAIRO_CONTENT_ALPHA)
format = CAIRO_FORMAT_A8;
else
return NULL;
@@ -2113,17 +2202,17 @@ _cairo_quartz_surface_clone_similar (voi
_cairo_quartz_surface_create_internal (NULL, CAIRO_CONTENT_COLOR_ALPHA,
qsurf->extents.width, qsurf->extents.height);
*clone_offset_x = 0;
*clone_offset_y = 0;
return CAIRO_STATUS_SUCCESS;
}
}
- status = _cairo_surface_to_cgimage ((cairo_surface_t*) abstract_surface, src, &quartz_image);
+ status = _cairo_surface_to_cgimage (src, &quartz_image);
if (status)
return CAIRO_INT_STATUS_UNSUPPORTED;
new_format = CAIRO_FORMAT_ARGB32; /* assumed */
if (_cairo_surface_is_image (src)) {
new_format = ((cairo_image_surface_t *) src)->format;
}
@@ -2194,17 +2283,18 @@ _cairo_quartz_surface_paint (void *abstr
if (state.action == DO_SOLID || state.action == DO_PATTERN) {
CGContextFillRect (state.context, CGRectMake(surface->extents.x,
surface->extents.y,
surface->extents.width,
surface->extents.height));
} else if (state.action == DO_SHADING) {
CGContextConcatCTM (state.context, state.transform);
CGContextDrawShading (state.context, state.shading);
- } else if (state.action == DO_IMAGE || state.action == DO_TILED_IMAGE) {
+ } else if (state.action == DO_IMAGE || state.action == DO_TILED_IMAGE ||
+ state.action == DO_LAYER) {
_cairo_quartz_draw_image (&state, op);
} else if (state.action != DO_NOTHING) {
rv = CAIRO_INT_STATUS_UNSUPPORTED;
}
_cairo_quartz_teardown_state (&state);
ND((stderr, "-- paint\n"));
@@ -2291,17 +2381,18 @@ _cairo_quartz_surface_fill (void *abstra
// with the shading
if (fill_rule == CAIRO_FILL_RULE_WINDING)
CGContextClip (state.context);
else
CGContextEOClip (state.context);
CGContextConcatCTM (state.context, state.transform);
CGContextDrawShading (state.context, state.shading);
- } else if (state.action == DO_IMAGE || state.action == DO_TILED_IMAGE) {
+ } else if (state.action == DO_IMAGE || state.action == DO_TILED_IMAGE ||
+ state.action == DO_LAYER) {
if (fill_rule == CAIRO_FILL_RULE_WINDING)
CGContextClip (state.context);
else
CGContextEOClip (state.context);
_cairo_quartz_draw_image (&state, op);
} else if (state.action != DO_NOTHING) {
rv = CAIRO_INT_STATUS_UNSUPPORTED;
@@ -2416,17 +2507,18 @@ _cairo_quartz_surface_stroke (void *abst
if (rv)
goto BAIL;
if (!_cairo_operator_bounded_by_mask (op) && CGContextCopyPathPtr)
path_for_unbounded = CGContextCopyPathPtr (state.context);
if (state.action == DO_SOLID || state.action == DO_PATTERN) {
CGContextStrokePath (state.context);
- } else if (state.action == DO_IMAGE || state.action == DO_TILED_IMAGE) {
+ } else if (state.action == DO_IMAGE || state.action == DO_TILED_IMAGE ||
+ state.action == DO_LAYER) {
CGContextReplacePathWithStrokedPath (state.context);
CGContextClip (state.context);
CGContextSetCTM (state.context, origCTM);
_cairo_quartz_draw_image (&state, op);
} else if (state.action == DO_SHADING) {
CGContextReplacePathWithStrokedPath (state.context);
CGContextClip (state.context);
@@ -2511,17 +2603,18 @@ _cairo_quartz_surface_show_glyphs (void
&glyph_extents, NULL);
state = _cairo_quartz_setup_state (surface, source, op, &glyph_extents);
} else {
state = _cairo_quartz_setup_state (surface, source, op, NULL);
}
if (state.action == DO_SOLID || state.action == DO_PATTERN) {
CGContextSetTextDrawingMode (state.context, kCGTextFill);
- } else if (state.action == DO_IMAGE || state.action == DO_TILED_IMAGE || state.action == DO_SHADING) {
+ } else if (state.action == DO_IMAGE || state.action == DO_TILED_IMAGE ||
+ state.action == DO_SHADING || state.action == DO_LAYER) {
CGContextSetTextDrawingMode (state.context, kCGTextClip);
isClipping = TRUE;
} else {
if (state.action != DO_NOTHING)
rv = CAIRO_INT_STATUS_UNSUPPORTED;
goto BAIL;
}
@@ -2622,17 +2715,18 @@ _cairo_quartz_surface_show_glyphs (void
CGContextShowGlyphsWithAdvances (state.context,
cg_glyphs,
cg_advances,
num_glyphs);
CGContextSetCTM (state.context, ctm);
- if (state.action == DO_IMAGE || state.action == DO_TILED_IMAGE) {
+ if (state.action == DO_IMAGE || state.action == DO_TILED_IMAGE ||
+ state.action == DO_LAYER) {
_cairo_quartz_draw_image (&state, op);
} else if (state.action == DO_SHADING) {
CGContextConcatCTM (state.context, state.transform);
CGContextDrawShading (state.context, state.shading);
}
BAIL:
if (didForceFontSmoothing)
@@ -2679,17 +2773,17 @@ _cairo_quartz_surface_mask_with_surface
cairo_clip_t *clip)
{
CGRect rect;
CGImageRef img;
cairo_surface_t *pat_surf = mask->surface;
cairo_status_t status = CAIRO_STATUS_SUCCESS;
CGAffineTransform ctm, mask_matrix;
- status = _cairo_surface_to_cgimage ((cairo_surface_t *) surface, pat_surf, &img);
+ status = _cairo_surface_to_cgimage (pat_surf, &img);
if (status)
return status;
if (img == NULL) {
if (!_cairo_operator_bounded_by_mask (op))
CGContextClearRect (surface->cgContext, CGContextGetClipBoundingBox (surface->cgContext));
return CAIRO_STATUS_SUCCESS;
}
@@ -2869,17 +2963,17 @@ _cairo_quartz_surface_clipper_intersect_
}
// XXXtodo implement show_page; need to figure out how to handle begin/end
static const struct _cairo_surface_backend cairo_quartz_surface_backend = {
CAIRO_SURFACE_TYPE_QUARTZ,
_cairo_quartz_surface_create_similar,
_cairo_quartz_surface_finish,
- _cairo_quartz_surface_acquire_source_image,
+ _cairo_quartz_surface_acquire_image,
_cairo_quartz_surface_release_source_image,
_cairo_quartz_surface_acquire_dest_image,
_cairo_quartz_surface_release_dest_image,
_cairo_quartz_surface_clone_similar,
NULL, /* composite */
NULL, /* fill_rectangles */
NULL, /* composite_trapezoids */
NULL, /* create_span_renderer */
@@ -2950,16 +3044,17 @@ _cairo_quartz_surface_create_internal (C
CGContextSaveGState (cgContext);
surface->cgContext = cgContext;
surface->cgContextBaseCTM = CGContextGetCTM (cgContext);
surface->imageData = NULL;
surface->imageSurfaceEquiv = NULL;
surface->bitmapContextImage = NULL;
+ surface->cgLayer = NULL;
return surface;
}
/**
* cairo_quartz_surface_create_for_cg_context
* @cgContext: the existing CGContext for which to create the surface
* @width: width of the surface, in pixels
@@ -3002,16 +3097,88 @@ cairo_quartz_surface_create_for_cg_conte
// create_internal will have set an error
return (cairo_surface_t*) surf;
}
return (cairo_surface_t *) surf;
}
/**
+ * cairo_quartz_cglayer_surface_create_similar
+ * @surface: The returned surface can be efficiently drawn into this
+ * destination surface (if tiling is not used)."
+ * @width: width of the surface, in pixels
+ * @height: height of the surface, in pixels
+ *
+ * Creates a Quartz surface backed by a CGLayer, if the given surface
+ * is a Quartz surface; the CGLayer is created to match the surface's
+ * Quartz context. Otherwise just calls cairo_surface_create_similar
+ * with CAIRO_CONTENT_COLOR_ALPHA.
+ * The returned surface can be efficiently blitted to the given surface,
+ * but tiling and 'extend' modes other than NONE are not so efficient.
+ *
+ * Return value: the newly created surface.
+ *
+ * Since: 1.10
+ **/
+cairo_surface_t *
+cairo_quartz_surface_create_cg_layer (cairo_surface_t *surface,
+ unsigned int width,
+ unsigned int height)
+{
+ cairo_quartz_surface_t *surf;
+ CGLayerRef layer;
+ CGContextRef ctx;
+ CGContextRef cgContext;
+
+ cgContext = cairo_quartz_surface_get_cg_context (surface);
+ if (!cgContext)
+ return cairo_surface_create_similar (surface, CAIRO_CONTENT_COLOR_ALPHA,
+ width, height);
+
+ if (!_cairo_quartz_verify_surface_size(width, height))
+ return _cairo_surface_create_in_error (_cairo_error (CAIRO_STATUS_INVALID_SIZE));
+
+ /* If we pass zero width or height into CGLayerCreateWithContext below,
+ * it will fail.
+ */
+ if (width == 0 || height == 0) {
+ return (cairo_surface_t*)
+ _cairo_quartz_surface_create_internal (NULL, CAIRO_CONTENT_COLOR_ALPHA,
+ width, height);
+ }
+
+ layer = CGLayerCreateWithContext (cgContext,
+ CGSizeMake (width, height),
+ NULL);
+ if (!layer)
+ return _cairo_surface_create_in_error (_cairo_error (CAIRO_STATUS_NO_MEMORY));
+
+ ctx = CGLayerGetContext (layer);
+ /* Flip it when we draw into it, so that when we finally composite it
+ * to a flipped target, the directions match and Quartz will optimize
+ * the composition properly
+ */
+ CGContextTranslateCTM (ctx, 0, height);
+ CGContextScaleCTM (ctx, 1, -1);
+
+ CGContextRetain (ctx);
+ surf = _cairo_quartz_surface_create_internal (ctx, CAIRO_CONTENT_COLOR_ALPHA,
+ width, height);
+ if (surf->base.status) {
+ CGLayerRelease (layer);
+ // create_internal will have set an error
+ return (cairo_surface_t*) surf;
+ }
+ surf->cgLayer = layer;
+
+ return (cairo_surface_t *) surf;
+}
+
+/**
* cairo_quartz_surface_create
* @format: format of pixels in the surface to create
* @width: width of the surface, in pixels
* @height: height of the surface, in pixels
*
* Creates a Quartz surface backed by a CGBitmap. The surface is
* created using the Device RGB (or Device Gray, for A8) color space.
* All Cairo operations, including those that require software
diff --git a/gfx/cairo/cairo/src/cairo-quartz.h b/gfx/cairo/cairo/src/cairo-quartz.h
--- a/gfx/cairo/cairo/src/cairo-quartz.h
+++ b/gfx/cairo/cairo/src/cairo-quartz.h
@@ -45,16 +45,21 @@
CAIRO_BEGIN_DECLS
cairo_public cairo_surface_t *
cairo_quartz_surface_create (cairo_format_t format,
unsigned int width,
unsigned int height);
cairo_public cairo_surface_t *
+cairo_quartz_surface_create_cg_layer (cairo_surface_t *surface,
+ unsigned int width,
+ unsigned int height);
+
+cairo_public cairo_surface_t *
cairo_quartz_surface_create_for_cg_context (CGContextRef cgContext,
unsigned int width,
unsigned int height);
cairo_public CGContextRef
cairo_quartz_surface_get_cg_context (cairo_surface_t *surface);
cairo_public CGContextRef
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