libwebp: update to v0.5.1

third_party/libwebp/dsp/lossless.c

 // Copyright 2012 Google Inc. All Rights Reserved.
 //
 // Use of this source code is governed by a BSD-style license
 // that can be found in the COPYING file in the root of the source
 // tree. An additional intellectual property rights grant can be found
 // in the file PATENTS. All contributing project authors may
 // be found in the AUTHORS file in the root of the source tree.
 // -----------------------------------------------------------------------------
 //
 // Image transforms and color space conversion methods for lossless decoder.
@@ skipping 10 matching lines @@
 #include "../utils/endian_inl.h"
 #include "./lossless.h"
 
 #define MAX_DIFF_COST (1e30f)
 
 //------------------------------------------------------------------------------
 // Image transforms.
 
 // In-place sum of each component with mod 256.
 static WEBP_INLINE void AddPixelsEq(uint32_t* a, uint32_t b) {
-  const uint32_t alpha_and_green = (*a & 0xff00ff00u) + (b & 0xff00ff00u);
-  const uint32_t red_and_blue = (*a & 0x00ff00ffu) + (b & 0x00ff00ffu);
-  *a = (alpha_and_green & 0xff00ff00u) | (red_and_blue & 0x00ff00ffu);
+  *a = VP8LAddPixels(*a, b);
 }
 
 static WEBP_INLINE uint32_t Average2(uint32_t a0, uint32_t a1) {
   return (((a0 ^ a1) & 0xfefefefeu) >> 1) + (a0 & a1);
 }
 
 static WEBP_INLINE uint32_t Average3(uint32_t a0, uint32_t a1, uint32_t a2) {
   return Average2(Average2(a0, a2), a1);
 }
 
@@ skipping 582 matching lines @@
 #if defined(WEBP_USE_MIPS_DSP_R2)
     if (VP8GetCPUInfo(kMIPSdspR2)) {
       VP8LDspInitMIPSdspR2();
     }
 #endif
   }
   lossless_last_cpuinfo_used = VP8GetCPUInfo;
 }
 
 //------------------------------------------------------------------------------