[cairo-xlib] Cache standard xrender formats.

XRender performs a round-trip in order to query the available formats on
the xserver, before searching for a matching format. In order to save
that round-trip and to avoid the short-lived allocation of the array of
available formats, we cache the result on the display.

1 files changed, 7 insertions, 0 deletions

diff --git a/src/cairo-xlib-private.h b/src/cairo-xlib-private.h
index 2d9737d93..a88e6b532 100644
--- a/src/cairo-xlib-private.h
+++ b/src/cairo-xlib-private.h
@@ -34,6 +34,7 @@
 #define CAIRO_XLIB_PRIVATE_H
 
 #include "cairo-xlib.h"
+#include "cairo-xlib-xrender-private.h"
 
 #include "cairo-compiler-private.h"
 #include "cairo-freelist-private.h"
@@ -61,6 +62,8 @@ struct _cairo_xlib_display {
     Display *display;
     cairo_xlib_screen_info_t *screens;
 
+    XRenderPictFormat *cached_xrender_formats[CAIRO_FORMAT_A1 + 1];
+
     cairo_xlib_job_t *workqueue;
     cairo_freelist_t wq_freelist;
 
@@ -118,6 +121,10 @@ _cairo_xlib_display_queue_resource (cairo_xlib_display_t *display,
 cairo_private void
 _cairo_xlib_display_notify (cairo_xlib_display_t *display);
 
+cairo_private XRenderPictFormat *
+_cairo_xlib_display_get_xrender_format (cairo_xlib_display_t	*display,
+	                                cairo_format_t		 format);
+
 cairo_private cairo_xlib_screen_info_t *
 _cairo_xlib_screen_info_get (Display *display, Screen *screen);