How about:
diff --git a/src/sna/gen4_render.c b/src/sna/gen4_render.c
index cc1778a..0a59681 100644
--- a/src/sna/gen4_render.c
+++ b/src/sna/gen4_render.c
@@ -1895,6 +1895,9 @@ gen4_render_composite(struct sna *sna,
tmp->has_component_alpha = false;
tmp->need_magic_ca_pass = false;
+ if (!mask)
+ mask = sna->render.white_picture;
+
if (mask) {
if (mask->componentAlpha && PICT_FORMAT_RGB(mask->format)) {
tmp->has_component_alpha = true;
--
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https://bugs.launchpad.net/bugs/1098334
Title:
Font corruption in Chromium tab bar using Intel SNA
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https://bugs.launchpad.net/xserver-xorg-video-intel/+bug/1098334/+subscriptions
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