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GUACAMOLE-188: Clamp alpha blending results to maximum component value (0xFF).

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This commit is contained in:
Michael Jumper 2017-02-25 16:26:37 -08:00
parent 12d29569a6
commit 0fb567bb53
1 changed files with 9 additions and 1 deletions
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10
src/common/surface.c
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@ -880,7 +880,15 @@ static void __guac_common_surface_set(guac_common_surface* dst,
* given source and destination components. * given source and destination components.
*/ */
static int guac_common_surface_blend_component(int dst, int src, int alpha) { static int guac_common_surface_blend_component(int dst, int src, int alpha) {
return src + dst * (0xFF - alpha);
int blended = src + dst * (0xFF - alpha);
/* Do not exceed maximum component value */
if (blended > 0xFF)
return 0xFF;
return blended;
} }
/** /**