libwebp: update to v0.5.1

third_party/libwebp/dsp/upsampling_mips_dsp_r2.c

Index: third_party/libwebp/dsp/upsampling_mips_dsp_r2.c
diff --git a/third_party/libwebp/dsp/upsampling_mips_dsp_r2.c b/third_party/libwebp/dsp/upsampling_mips_dsp_r2.c
index d4ccbe0adaad8f2da5db53b44acc55c29d648a3b..ed2eb748255e97dd3bf93391f6a03797e403e5cd 100644
--- a/third_party/libwebp/dsp/upsampling_mips_dsp_r2.c
+++ b/third_party/libwebp/dsp/upsampling_mips_dsp_r2.c
@@ -14,9 +14,7 @@
 
 #include "./dsp.h"
 
-// Code is disabled for now, in favor of the plain-C version
-// TODO(djordje.pesut): adapt the code to reflect the C-version.
-#if 0 // defined(WEBP_USE_MIPS_DSP_R2)
+#if defined(WEBP_USE_MIPS_DSP_R2)
 
 #include <assert.h>
 #include "./yuv.h"
@@ -24,21 +22,21 @@
 #if !defined(WEBP_YUV_USE_TABLE)
 
 #define YUV_TO_RGB(Y, U, V, R, G, B) do {                                      \
-    const int t1 = kYScale * Y;                                                \
-    const int t2 = kVToG * V;                                                  \
-    R = kVToR * V;                                                             \
-    G = kUToG * U;                                                             \
-    B = kUToB * U;                                                             \
+    const int t1 = MultHi(Y, 19077);                                           \
+    const int t2 = MultHi(V, 13320);                                           \
+    R = MultHi(V, 26149);                                                      \
+    G = MultHi(U, 6419);                                                       \
+    B = MultHi(U, 33050);                                                      \
     R = t1 + R;                                                                \
     G = t1 - G;                                                                \
     B = t1 + B;                                                                \
-    R = R + kRCst;                                                             \
-    G = G - t2 + kGCst;                                                        \
-    B = B + kBCst;                                                             \
+    R = R - 14234;                                                             \
+    G = G - t2 + 8708;                                                         \
+    B = B - 17685;                                                             \
     __asm__ volatile (                                                         \
-      "shll_s.w         %[" #R "],      %[" #R "],        9          \n\t"     \
-      "shll_s.w         %[" #G "],      %[" #G "],        9          \n\t"     \
-      "shll_s.w         %[" #B "],      %[" #B "],        9          \n\t"     \
+      "shll_s.w         %[" #R "],      %[" #R "],        17         \n\t"     \
+      "shll_s.w         %[" #G "],      %[" #G "],        17         \n\t"     \
+      "shll_s.w         %[" #B "],      %[" #B "],        17         \n\t"     \
       "precrqu_s.qb.ph  %[" #R "],      %[" #R "],        $zero      \n\t"     \
       "precrqu_s.qb.ph  %[" #G "],      %[" #G "],        $zero      \n\t"     \
       "precrqu_s.qb.ph  %[" #B "],      %[" #B "],        $zero      \n\t"     \
@@ -279,6 +277,6 @@ WEBP_DSP_INIT_STUB(WebPInitYUV444ConvertersMIPSdspR2)
 
 #endif  // WEBP_USE_MIPS_DSP_R2
 
-#if 1  // !(defined(FANCY_UPSAMPLING) && defined(WEBP_USE_MIPS_DSP_R2))
+#if !(defined(FANCY_UPSAMPLING) && defined(WEBP_USE_MIPS_DSP_R2))
 WEBP_DSP_INIT_STUB(WebPInitUpsamplersMIPSdspR2)
 #endif