Fix alpha premultiplication in XRenderParseColor.

Due to C arithmetic conversion rules we must use an unsigned constant (or a cast) to perform the multiplication using unsigned arithmetic. Fixes ArcticaProject/nx-libs#55. Author: Emanuele Giaquinta <emanuele.giaquinta@gmail.com> Reviewed-by: Jeremy Huddleston <jeremyhu@apple.com> Rebased against NX: Mike Gabriel <mike.gabriel@das-netzwerkteam.de>

Fix alpha premultiplication in XRenderParseColor.
ffc87da6 · Emanuele Giaquinta · Mike Gabriel · 8cf9283b · ffc87da6
Commit ffc87da6 authored Jun 23, 2015 by Emanuele Giaquinta Committed by Mike Gabriel Jun 23, 2015
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Color.c nx-X11/lib/Xrender/Color.c +3 -3

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--- a/nx-X11/lib/Xrender/Color.c
+++ b/nx-X11/lib/Xrender/Color.c
@@ -85,8 +85,8 @@ XRenderParseColor(Display *dpy, char *spec, XRenderColor *def)
 	def->blue = coreColor.blue;
 	def->alpha = 0xffff;
    }
-    def->red = (def->red * def->alpha) / 65535;
-    def->green = (def->green * def->alpha) / 65535;
-    def->blue = (def->blue * def->alpha) / 65535;
+    def->red = (def->red * def->alpha) / 0xffffU;
+    def->green = (def->green * def->alpha) / 0xffffU;
+    def->blue = (def->blue * def->alpha) / 0xffffU;
    return 1;
 }