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commit ffc87da60b2262432d56f15332b3edd15b7e00b2
Author: Emanuele Giaquinta <emanuele.giaquinta@gmail.com>
Date: Tue Jun 23 16:09:50 2015 +0200
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>
v3: backport to nx-libs 3.5.0.x (Mihai Moldovan)
--- 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;
}
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