libwebp: update snapshot to v0.3.0-rc6

third_party/libwebp/dsp/yuv.c

 // Copyright 2010 Google Inc. All Rights Reserved.
 //
 // This code is licensed under the same terms as WebM:
 //  Software License Agreement:  http://www.webmproject.org/license/software/
 //  Additional IP Rights Grant:  http://www.webmproject.org/license/additional/
 // -----------------------------------------------------------------------------
 //
 // YUV->RGB conversion function
 //
 // Author: Skal (pascal.massimino@gmail.com)
 
 #include "./yuv.h"
 
 #if defined(__cplusplus) || defined(c_plusplus)
 extern "C" {
 #endif
 
-enum { YUV_HALF = 1 << (YUV_FIX - 1) };
+#ifdef WEBP_YUV_USE_TABLE
 
 int16_t VP8kVToR[256], VP8kUToB[256];
 int32_t VP8kVToG[256], VP8kUToG[256];
 uint8_t VP8kClip[YUV_RANGE_MAX - YUV_RANGE_MIN];
 uint8_t VP8kClip4Bits[YUV_RANGE_MAX - YUV_RANGE_MIN];
 
 static int done = 0;
 
 static WEBP_INLINE uint8_t clip(int v, int max_value) {
   return v < 0 ? 0 : v > max_value ? max_value : v;
 }
 
 void VP8YUVInit(void) {
   int i;
   if (done) {
     return;
   }
+#ifndef USE_YUVj
   for (i = 0; i < 256; ++i) {
     VP8kVToR[i] = (89858 * (i - 128) + YUV_HALF) >> YUV_FIX;
     VP8kUToG[i] = -22014 * (i - 128) + YUV_HALF;
     VP8kVToG[i] = -45773 * (i - 128);
     VP8kUToB[i] = (113618 * (i - 128) + YUV_HALF) >> YUV_FIX;
   }
   for (i = YUV_RANGE_MIN; i < YUV_RANGE_MAX; ++i) {
     const int k = ((i - 16) * 76283 + YUV_HALF) >> YUV_FIX;
     VP8kClip[i - YUV_RANGE_MIN] = clip(k, 255);
     VP8kClip4Bits[i - YUV_RANGE_MIN] = clip((k + 8) >> 4, 15);
   }
+#else
+  for (i = 0; i < 256; ++i) {
+    VP8kVToR[i] = (91881 * (i - 128) + YUV_HALF) >> YUV_FIX;
+    VP8kUToG[i] = -22554 * (i - 128) + YUV_HALF;
+    VP8kVToG[i] = -46802 * (i - 128);
+    VP8kUToB[i] = (116130 * (i - 128) + YUV_HALF) >> YUV_FIX;
+  }
+  for (i = YUV_RANGE_MIN; i < YUV_RANGE_MAX; ++i) {
+    const int k = i;
+    VP8kClip[i - YUV_RANGE_MIN] = clip(k, 255);
+    VP8kClip4Bits[i - YUV_RANGE_MIN] = clip((k + 8) >> 4, 15);
+  }
+#endif
+
   done = 1;
 }
 
+#else
+
+void VP8YUVInit(void) {}
+
+#endif  // WEBP_YUV_USE_TABLE
+
 #if defined(__cplusplus) || defined(c_plusplus)
 }    // extern "C"
 #endif