xlib,xcb: Force strict adherence to the Render specification when testing

Introduce cairo_xlib_device_debug_set_precision() to override the
automatic selection of rendering precision and force the Xorg/DDX to
strictly adhere to the precise rendering mode of the Render
specification. This allows us to test drivers without worrying, too
much, about minor discrepancies in antialiasing.

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>

1 files changed, 6 insertions, 0 deletions

diff --git a/src/cairo-xlib-private.h b/src/cairo-xlib-private.h
index bd260bc0..a44a9323 100644
--- a/src/cairo-xlib-private.h
+++ b/src/cairo-xlib-private.h
@@ -80,6 +80,8 @@ struct _cairo_xlib_display {
     cairo_xlib_job_t *workqueue;
     cairo_freelist_t wq_freelist;
 
+    int force_precision;
+
     cairo_xlib_hook_t *close_display_hooks;
     unsigned int buggy_gradients :1;
     unsigned int buggy_pad_reflect :1;
@@ -151,6 +153,10 @@ _cairo_xlib_display_has_reflect (cairo_device_t *device);
 cairo_private cairo_bool_t
 _cairo_xlib_display_has_gradients (cairo_device_t *device);
 
+cairo_private void
+_cairo_xlib_display_set_precision(cairo_device_t *device,
+				  int precision);
+
 cairo_private XRenderPictFormat *
 _cairo_xlib_display_get_xrender_format (cairo_xlib_display_t	*display,
 	                                cairo_format_t		 format);