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<b><a class="bz_bug_link
bz_status_REOPENED "
title="REOPENED --- - [sna gen4] corrupt rendering (and flickering on redraw)"
href="https://bugs.freedesktop.org/show_bug.cgi?id=55500#c52">Comment # 52</a>
on <a class="bz_bug_link
bz_status_REOPENED "
title="REOPENED --- - [sna gen4] corrupt rendering (and flickering on redraw)"
href="https://bugs.freedesktop.org/show_bug.cgi?id=55500">bug 55500</a>
from <span class="vcard"><a class="email" href="mailto:chris@chris-wilson.co.uk" title="Chris Wilson <chris@chris-wilson.co.uk>"> <span class="fn">Chris Wilson</span></a>
</span></b>
<pre>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;</pre>
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