From afa3450c11d968f73f0230b8756df6ee660d9a84 Mon Sep 17 00:00:00 2001
From: skal <pascal.massimino@gmail.com>
Date: Sat, 18 May 2013 17:03:18 +0200
Subject: [PATCH] Fix the bug in ApplyPalette.

The auto-infer logic of detecting the 'Alpha' use case
(via check '(palette[i] & 0x00ff00ffu) != 0' is failing
for this corner case image with all black pixels (rgb = 0)
and different Alpha values.

-> switch generic use-LUT detection

Change-Id: I982a8b28c8bcc43e3dc68ac358f978a4bcc14c36
---
 src/enc/vp8l.c | 8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

diff --git a/src/enc/vp8l.c b/src/enc/vp8l.c
index 1797b7cc..6422c544 100644
--- a/src/enc/vp8l.c
+++ b/src/enc/vp8l.c
@@ -816,15 +816,15 @@ static void ApplyPalette(uint32_t* src, uint32_t* dst,
                          const uint32_t* palette, int palette_size,
                          int width, int height, int xbits, uint8_t* row) {
   int i, x, y;
-  int is_alpha = 1;
+  int use_LUT = 1;
   for (i = 0; i < palette_size; ++i) {
-    if ((palette[i] & 0x00ff00ffu) != 0) {
-      is_alpha = 0;
+    if ((palette[i] & 0xffff00ffu) != 0) {
+      use_LUT = 0;
       break;
     }
   }
 
-  if (is_alpha) {
+  if (use_LUT) {
     int inv_palette[MAX_PALETTE_SIZE] = { 0 };
     for (i = 0; i < palette_size; ++i) {
       const int color = (palette[i] >> 8) & 0xff;