gecko-dev/gfx/cairo/wrap-source_image.patch

Author: Jeff Muizelaar <jmuizelaar@mozilla.com>
diff --git a/src/cairo-surface.c b/src/cairo-surface.c
index 8278694..12f6242 100644
--- a/src/cairo-surface.c
+++ b/src/cairo-surface.c
@@ -1530,6 +1530,70 @@ _cairo_recording_surface_clone_similar (cairo_surface_t  *surface,
     return CAIRO_STATUS_SUCCESS;
 }
 
+struct acquire_source_image_data
+{
+    cairo_surface_t *src;
+    cairo_image_surface_t *image;
+    void *image_extra;
+};
+
+static void
+_wrap_release_source_image (void *data)
+{
+    struct acquire_source_image_data *acquire_data = data;
+    _cairo_surface_release_source_image (acquire_data->src,
+					 acquire_data->image,
+					 acquire_data->image_extra);
+    free(data);
+}
+
+static cairo_status_t
+_wrap_image (cairo_surface_t *src,
+	     cairo_image_surface_t *image,
+	     void *image_extra,
+	     cairo_image_surface_t **out)
+{
+    static cairo_user_data_key_t wrap_image_key;
+    cairo_image_surface_t *surface;
+    cairo_status_t status;
+
+    struct acquire_source_image_data *data = malloc (sizeof (*data));
+    if (unlikely (data == NULL))
+	return _cairo_error (CAIRO_STATUS_NO_MEMORY);
+    data->src = src;
+    data->image = image;
+    data->image_extra = image_extra;
+
+    surface = (cairo_image_surface_t *)
+	_cairo_image_surface_create_with_pixman_format (image->data,
+							image->pixman_format,
+							image->width,
+							image->height,
+							image->stride);
+    status = surface->base.status;
+    if (status) {
+	free (data);
+	return status;
+    }
+
+    status = _cairo_user_data_array_set_data (&surface->base.user_data,
+					      &wrap_image_key,
+					      data,
+					      _wrap_release_source_image);
+    if (status) {
+	cairo_surface_destroy (&surface->base);
+	free (data);
+	return status;
+    }
+
+    pixman_image_set_component_alpha (
+	surface->pixman_image,
+	pixman_image_get_component_alpha (surface->pixman_image));
+
+    *out = surface;
+    return CAIRO_STATUS_SUCCESS;
+}
+
 /**
  * _cairo_surface_clone_similar:
  * @surface: a #cairo_surface_t
@@ -1606,15 +1670,19 @@ _cairo_surface_clone_similar (cairo_surface_t  *surface,
 	    /* If we failed, try again with an image surface */
 	    status = _cairo_surface_acquire_source_image (src, &image, &image_extra);
 	    if (status == CAIRO_STATUS_SUCCESS) {
-		status =
-		    surface->backend->clone_similar (surface, &image->base,
-						     src_x, src_y,
-						     width, height,
-						     clone_offset_x,
-						     clone_offset_y,
-						     clone_out);
-
-		_cairo_surface_release_source_image (src, image, image_extra);
+		status = _wrap_image(src, image, image_extra, &image);
+		if (status != CAIRO_STATUS_SUCCESS) {
+		    _cairo_surface_release_source_image (src, image, image_extra);
+		} else {
+		    status =
+			surface->backend->clone_similar (surface, &image->base,
+							 src_x, src_y,
+							 width, height,
+							 clone_offset_x,
+							 clone_offset_y,
+							 clone_out);
+		    cairo_surface_destroy(&image->base);
+		}
 	    }
 	}
     }