[cairo] [patch] gl: create BGRA texture and avoid conversion

[Henry (Yu) Song - SISA]

Hi, Chris 

Thanks for comments. First patch - add _cairo_image_surface_coerce_to_pixman_format().

Thanks, Henry


diff --git a/src/cairo-image-surface.c b/src/cairo-image-surface.c
index 3fe6e43..4778610 100644
--- a/src/cairo-image-surface.c
+++ b/src/cairo-image-surface.c
@@ -1057,6 +1057,17 @@ cairo_image_surface_t *
 _cairo_image_surface_coerce_to_format (cairo_image_surface_t *surface,
 			               cairo_format_t	      format)
 {
+    pixman_format_code_t pixman_format = _cairo_format_to_pixman_format_code (format);
+
+    return _cairo_image_surface_coerce_to_pixman_format (surface, pixman_format);
+}
+
+/* A convenience function for when one needs to coerce an image
+ * surface to a specific pixman format. */
+cairo_private cairo_image_surface_t *
+_cairo_image_surface_coerce_to_pixman_format (cairo_image_surface_t *surface,
+					      pixman_format_code_t   pixman_format)
+{
     cairo_image_surface_t *clone;
     cairo_status_t status;
 
@@ -1064,11 +1075,15 @@ _cairo_image_surface_coerce_to_format (cairo_image_surface_t *surface,
     if (unlikely (status))
 	return (cairo_image_surface_t *)_cairo_surface_create_in_error (status);
 
-    if (surface->format == format)
+    if (surface->pixman_format == pixman_format)
 	return (cairo_image_surface_t *)cairo_surface_reference(&surface->base);
 
     clone = (cairo_image_surface_t *)
-	cairo_image_surface_create (format, surface->width, surface->height);
+	_cairo_image_surface_create_with_pixman_format (NULL,
+							pixman_format,
+							surface->width,
+							surface->height,
+							0);
     if (unlikely (clone->base.status))
 	return clone;
 
diff --git a/src/cairoint.h b/src/cairoint.h
index 861e2f7..18ce2df 100644
--- a/src/cairoint.h
+++ b/src/cairoint.h
@@ -1536,6 +1536,10 @@ cairo_private cairo_image_surface_t *
 _cairo_image_surface_coerce_to_format (cairo_image_surface_t	*surface,
 			               cairo_format_t		 format);
 
+cairo_private cairo_image_surface_t *
+_cairo_image_surface_coerce_to_pixman_format (cairo_image_surface_t *surface,
+					      pixman_format_code_t   pixman_format);
+
 cairo_private cairo_image_transparency_t
 _cairo_image_analyze_transparency (cairo_image_surface_t      *image);
 
-- 
1.7.9.5