The Tor Browser: media/libyuv/source/row_common.cc@b8a032363ba2 (annotated)

media/libyuv/source/row_common.cc@b8a032363ba2 (annotated)

media/libyuv/source/row_common.cc

Thu, 22 Jan 2015 13:21:57 +0100

author: Michael Schloh von Bennewitz <michael@schloh.com>
date: Thu, 22 Jan 2015 13:21:57 +0100
branch: TOR_BUG_9701
changeset 15: b8a032363ba2
permissions: -rw-r--r--

Incorporate requested changes from Mozilla in review:
https://bugzilla.mozilla.org/show_bug.cgi?id=1123480#c6

 /*
  *  Copyright 2011 The LibYuv Project Authors. All rights reserved.
  *
  *  Use of this source code is governed by a BSD-style license
  *  that can be found in the LICENSE 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.
  */
 #include "libyuv/row.h"
 #include <string.h>  // For memcpy and memset.
 #include "libyuv/basic_types.h"
 #ifdef __cplusplus
 namespace libyuv {
 extern "C" {
 #endif
 // llvm x86 is poor at ternary operator, so use branchless min/max.
 #define USE_BRANCHLESS 1
 #if USE_BRANCHLESS
 static __inline int32 clamp0(int32 v) {
   return ((-(v) >> 31) & (v));
 }
 static __inline int32 clamp255(int32 v) {
   return (((255 - (v)) >> 31) | (v)) & 255;
 }
 static __inline uint32 Clamp(int32 val) {
   int v = clamp0(val);
   return (uint32)(clamp255(v));
 }
 static __inline uint32 Abs(int32 v) {
   int m = v >> 31;
   return (v + m) ^ m;
 }
 #else  // USE_BRANCHLESS
 static __inline int32 clamp0(int32 v) {
   return (v < 0) ? 0 : v;
 }
 static __inline int32 clamp255(int32 v) {
   return (v > 255) ? 255 : v;
 }
 static __inline uint32 Clamp(int32 val) {
   int v = clamp0(val);
   return (uint32)(clamp255(v));
 }
 static __inline uint32 Abs(int32 v) {
   return (v < 0) ? -v : v;
 }
 #endif  // USE_BRANCHLESS
 #ifdef LIBYUV_LITTLE_ENDIAN
 #define WRITEWORD(p, v) *(uint32*)(p) = v
 #else
 static inline void WRITEWORD(uint8* p, uint32 v) {
   p[0] = (uint8)(v & 255);
   p[1] = (uint8)((v >> 8) & 255);
   p[2] = (uint8)((v >> 16) & 255);
   p[3] = (uint8)((v >> 24) & 255);
 }
 #endif
 void RGB24ToARGBRow_C(const uint8* src_rgb24, uint8* dst_argb, int width) {
   int x;
   for (x = 0; x < width; ++x) {
     uint8 b = src_rgb24[0];
     uint8 g = src_rgb24[1];
     uint8 r = src_rgb24[2];
     dst_argb[0] = b;
     dst_argb[1] = g;
     dst_argb[2] = r;
     dst_argb[3] = 255u;
     dst_argb += 4;
     src_rgb24 += 3;
   }
 }
 void RAWToARGBRow_C(const uint8* src_raw, uint8* dst_argb, int width) {
   int x;
   for (x = 0; x < width; ++x) {
     uint8 r = src_raw[0];
     uint8 g = src_raw[1];
     uint8 b = src_raw[2];
     dst_argb[0] = b;
     dst_argb[1] = g;
     dst_argb[2] = r;
     dst_argb[3] = 255u;
     dst_argb += 4;
     src_raw += 3;
   }
 }
 void RGB565ToARGBRow_C(const uint8* src_rgb565, uint8* dst_argb, int width) {
   int x;
   for (x = 0; x < width; ++x) {
     uint8 b = src_rgb565[0] & 0x1f;
     uint8 g = (src_rgb565[0] >> 5) | ((src_rgb565[1] & 0x07) << 3);
     uint8 r = src_rgb565[1] >> 3;
     dst_argb[0] = (b << 3) | (b >> 2);
     dst_argb[1] = (g << 2) | (g >> 4);
     dst_argb[2] = (r << 3) | (r >> 2);
     dst_argb[3] = 255u;
     dst_argb += 4;
     src_rgb565 += 2;
   }
 }
 void ARGB1555ToARGBRow_C(const uint8* src_argb1555, uint8* dst_argb,
                          int width) {
   int x;
   for (x = 0; x < width; ++x) {
     uint8 b = src_argb1555[0] & 0x1f;
     uint8 g = (src_argb1555[0] >> 5) | ((src_argb1555[1] & 0x03) << 3);
     uint8 r = (src_argb1555[1] & 0x7c) >> 2;
     uint8 a = src_argb1555[1] >> 7;
     dst_argb[0] = (b << 3) | (b >> 2);
     dst_argb[1] = (g << 3) | (g >> 2);
     dst_argb[2] = (r << 3) | (r >> 2);
     dst_argb[3] = -a;
     dst_argb += 4;
     src_argb1555 += 2;
   }
 }
 void ARGB4444ToARGBRow_C(const uint8* src_argb4444, uint8* dst_argb,
                          int width) {
   int x;
   for (x = 0; x < width; ++x) {
     uint8 b = src_argb4444[0] & 0x0f;
     uint8 g = src_argb4444[0] >> 4;
     uint8 r = src_argb4444[1] & 0x0f;
     uint8 a = src_argb4444[1] >> 4;
     dst_argb[0] = (b << 4) | b;
     dst_argb[1] = (g << 4) | g;
     dst_argb[2] = (r << 4) | r;
     dst_argb[3] = (a << 4) | a;
     dst_argb += 4;
     src_argb4444 += 2;
   }
 }
 void ARGBToRGB24Row_C(const uint8* src_argb, uint8* dst_rgb, int width) {
   int x;
   for (x = 0; x < width; ++x) {
     uint8 b = src_argb[0];
     uint8 g = src_argb[1];
     uint8 r = src_argb[2];
     dst_rgb[0] = b;
     dst_rgb[1] = g;
     dst_rgb[2] = r;
     dst_rgb += 3;
     src_argb += 4;
   }
 }
 void ARGBToRAWRow_C(const uint8* src_argb, uint8* dst_rgb, int width) {
   int x;
   for (x = 0; x < width; ++x) {
     uint8 b = src_argb[0];
     uint8 g = src_argb[1];
     uint8 r = src_argb[2];
     dst_rgb[0] = r;
     dst_rgb[1] = g;
     dst_rgb[2] = b;
     dst_rgb += 3;
     src_argb += 4;
   }
 }
 void ARGBToRGB565Row_C(const uint8* src_argb, uint8* dst_rgb, int width) {
   int x;
   for (x = 0; x < width - 1; x += 2) {
     uint8 b0 = src_argb[0] >> 3;
     uint8 g0 = src_argb[1] >> 2;
     uint8 r0 = src_argb[2] >> 3;
     uint8 b1 = src_argb[4] >> 3;
     uint8 g1 = src_argb[5] >> 2;
     uint8 r1 = src_argb[6] >> 3;
     WRITEWORD(dst_rgb, b0 | (g0 << 5) | (r0 << 11) |
               (b1 << 16) | (g1 << 21) | (r1 << 27));
     dst_rgb += 4;
     src_argb += 8;
   }
   if (width & 1) {
     uint8 b0 = src_argb[0] >> 3;
     uint8 g0 = src_argb[1] >> 2;
     uint8 r0 = src_argb[2] >> 3;
     *(uint16*)(dst_rgb) = b0 | (g0 << 5) | (r0 << 11);
   }
 }
 void ARGBToARGB1555Row_C(const uint8* src_argb, uint8* dst_rgb, int width) {
   int x;
   for (x = 0; x < width - 1; x += 2) {
     uint8 b0 = src_argb[0] >> 3;
     uint8 g0 = src_argb[1] >> 3;
     uint8 r0 = src_argb[2] >> 3;
     uint8 a0 = src_argb[3] >> 7;
     uint8 b1 = src_argb[4] >> 3;
     uint8 g1 = src_argb[5] >> 3;
     uint8 r1 = src_argb[6] >> 3;
     uint8 a1 = src_argb[7] >> 7;
     *(uint32*)(dst_rgb) =
         b0 | (g0 << 5) | (r0 << 10) | (a0 << 15) |
         (b1 << 16) | (g1 << 21) | (r1 << 26) | (a1 << 31);
     dst_rgb += 4;
     src_argb += 8;
   }
   if (width & 1) {
     uint8 b0 = src_argb[0] >> 3;
     uint8 g0 = src_argb[1] >> 3;
     uint8 r0 = src_argb[2] >> 3;
     uint8 a0 = src_argb[3] >> 7;
     *(uint16*)(dst_rgb) =
         b0 | (g0 << 5) | (r0 << 10) | (a0 << 15);
   }
 }
 void ARGBToARGB4444Row_C(const uint8* src_argb, uint8* dst_rgb, int width) {
   int x;
   for (x = 0; x < width - 1; x += 2) {
     uint8 b0 = src_argb[0] >> 4;
     uint8 g0 = src_argb[1] >> 4;
     uint8 r0 = src_argb[2] >> 4;
     uint8 a0 = src_argb[3] >> 4;
     uint8 b1 = src_argb[4] >> 4;
     uint8 g1 = src_argb[5] >> 4;
     uint8 r1 = src_argb[6] >> 4;
     uint8 a1 = src_argb[7] >> 4;
     *(uint32*)(dst_rgb) =
         b0 | (g0 << 4) | (r0 << 8) | (a0 << 12) |
         (b1 << 16) | (g1 << 20) | (r1 << 24) | (a1 << 28);
     dst_rgb += 4;
     src_argb += 8;
   }
   if (width & 1) {
     uint8 b0 = src_argb[0] >> 4;
     uint8 g0 = src_argb[1] >> 4;
     uint8 r0 = src_argb[2] >> 4;
     uint8 a0 = src_argb[3] >> 4;
     *(uint16*)(dst_rgb) =
         b0 | (g0 << 4) | (r0 << 8) | (a0 << 12);
   }
 }
 static __inline int RGBToY(uint8 r, uint8 g, uint8 b) {
   return (66 * r + 129 * g +  25 * b + 0x1080) >> 8;
 }
 static __inline int RGBToU(uint8 r, uint8 g, uint8 b) {
   return (112 * b - 74 * g - 38 * r + 0x8080) >> 8;
 }
 static __inline int RGBToV(uint8 r, uint8 g, uint8 b) {
   return (112 * r - 94 * g - 18 * b + 0x8080) >> 8;
 }
 #define MAKEROWY(NAME, R, G, B, BPP) \
 void NAME ## ToYRow_C(const uint8* src_argb0, uint8* dst_y, int width) {       \
   int x;                                                                       \
   for (x = 0; x < width; ++x) {                                                \
     dst_y[0] = RGBToY(src_argb0[R], src_argb0[G], src_argb0[B]);               \
     src_argb0 += BPP;                                                          \
     dst_y += 1;                                                                \
   }                                                                            \
 }                                                                              \
 void NAME ## ToUVRow_C(const uint8* src_rgb0, int src_stride_rgb,              \
                        uint8* dst_u, uint8* dst_v, int width) {                \
   const uint8* src_rgb1 = src_rgb0 + src_stride_rgb;                           \
   int x;                                                                       \
   for (x = 0; x < width - 1; x += 2) {                                         \
     uint8 ab = (src_rgb0[B] + src_rgb0[B + BPP] +                              \
                src_rgb1[B] + src_rgb1[B + BPP]) >> 2;                          \
     uint8 ag = (src_rgb0[G] + src_rgb0[G + BPP] +                              \
                src_rgb1[G] + src_rgb1[G + BPP]) >> 2;                          \
     uint8 ar = (src_rgb0[R] + src_rgb0[R + BPP] +                              \
                src_rgb1[R] + src_rgb1[R + BPP]) >> 2;                          \
     dst_u[0] = RGBToU(ar, ag, ab);                                             \
     dst_v[0] = RGBToV(ar, ag, ab);                                             \
     src_rgb0 += BPP * 2;                                                       \
     src_rgb1 += BPP * 2;                                                       \
     dst_u += 1;                                                                \
     dst_v += 1;                                                                \
   }                                                                            \
   if (width & 1) {                                                             \
     uint8 ab = (src_rgb0[B] + src_rgb1[B]) >> 1;                               \
     uint8 ag = (src_rgb0[G] + src_rgb1[G]) >> 1;                               \
     uint8 ar = (src_rgb0[R] + src_rgb1[R]) >> 1;                               \
     dst_u[0] = RGBToU(ar, ag, ab);                                             \
     dst_v[0] = RGBToV(ar, ag, ab);                                             \
   }                                                                            \
 }
 MAKEROWY(ARGB, 2, 1, 0, 4)
 MAKEROWY(BGRA, 1, 2, 3, 4)
 MAKEROWY(ABGR, 0, 1, 2, 4)
 MAKEROWY(RGBA, 3, 2, 1, 4)
 MAKEROWY(RGB24, 2, 1, 0, 3)
 MAKEROWY(RAW, 0, 1, 2, 3)
 #undef MAKEROWY
 // JPeg uses a variation on BT.601-1 full range
 // y =  0.29900 * r + 0.58700 * g + 0.11400 * b
 // u = -0.16874 * r - 0.33126 * g + 0.50000 * b  + center
 // v =  0.50000 * r - 0.41869 * g - 0.08131 * b  + center
 // BT.601 Mpeg range uses:
 // b 0.1016 * 255 = 25.908 = 25
 // g 0.5078 * 255 = 129.489 = 129
 // r 0.2578 * 255 = 65.739 = 66
 // JPeg 8 bit Y (not used):
 // b 0.11400 * 256 = 29.184 = 29
 // g 0.58700 * 256 = 150.272 = 150
 // r 0.29900 * 256 = 76.544 = 77
 // JPeg 7 bit Y:
 // b 0.11400 * 128 = 14.592 = 15
 // g 0.58700 * 128 = 75.136 = 75
 // r 0.29900 * 128 = 38.272 = 38
 // JPeg 8 bit U:
 // b  0.50000 * 255 = 127.5 = 127
 // g -0.33126 * 255 = -84.4713 = -84
 // r -0.16874 * 255 = -43.0287 = -43
 // JPeg 8 bit V:
 // b -0.08131 * 255 = -20.73405 = -20
 // g -0.41869 * 255 = -106.76595 = -107
 // r  0.50000 * 255 = 127.5 = 127
 static __inline int RGBToYJ(uint8 r, uint8 g, uint8 b) {
   return (38 * r + 75 * g +  15 * b + 64) >> 7;
 }
 static __inline int RGBToUJ(uint8 r, uint8 g, uint8 b) {
   return (127 * b - 84 * g - 43 * r + 0x8080) >> 8;
 }
 static __inline int RGBToVJ(uint8 r, uint8 g, uint8 b) {
   return (127 * r - 107 * g - 20 * b + 0x8080) >> 8;
 }
 #define AVGB(a, b) (((a) + (b) + 1) >> 1)
 #define MAKEROWYJ(NAME, R, G, B, BPP) \
 void NAME ## ToYJRow_C(const uint8* src_argb0, uint8* dst_y, int width) {      \
   int x;                                                                       \
   for (x = 0; x < width; ++x) {                                                \
     dst_y[0] = RGBToYJ(src_argb0[R], src_argb0[G], src_argb0[B]);              \
     src_argb0 += BPP;                                                          \
     dst_y += 1;                                                                \
   }                                                                            \
 }                                                                              \
 void NAME ## ToUVJRow_C(const uint8* src_rgb0, int src_stride_rgb,             \
                         uint8* dst_u, uint8* dst_v, int width) {               \
   const uint8* src_rgb1 = src_rgb0 + src_stride_rgb;                           \
   int x;                                                                       \
   for (x = 0; x < width - 1; x += 2) {                                         \
     uint8 ab = AVGB(AVGB(src_rgb0[B], src_rgb1[B]),                            \
                     AVGB(src_rgb0[B + BPP], src_rgb1[B + BPP]));               \
     uint8 ag = AVGB(AVGB(src_rgb0[G], src_rgb1[G]),                            \
                     AVGB(src_rgb0[G + BPP], src_rgb1[G + BPP]));               \
     uint8 ar = AVGB(AVGB(src_rgb0[R], src_rgb1[R]),                            \
                     AVGB(src_rgb0[R + BPP], src_rgb1[R + BPP]));               \
     dst_u[0] = RGBToUJ(ar, ag, ab);                                            \
     dst_v[0] = RGBToVJ(ar, ag, ab);                                            \
     src_rgb0 += BPP * 2;                                                       \
     src_rgb1 += BPP * 2;                                                       \
     dst_u += 1;                                                                \
     dst_v += 1;                                                                \
   }                                                                            \
   if (width & 1) {                                                             \
     uint8 ab = AVGB(src_rgb0[B], src_rgb1[B]);                                 \
     uint8 ag = AVGB(src_rgb0[G], src_rgb1[G]);                                 \
     uint8 ar = AVGB(src_rgb0[R], src_rgb1[R]);                                 \
     dst_u[0] = RGBToUJ(ar, ag, ab);                                            \
     dst_v[0] = RGBToVJ(ar, ag, ab);                                            \
   }                                                                            \
 }
 MAKEROWYJ(ARGB, 2, 1, 0, 4)
 #undef MAKEROWYJ
 void RGB565ToYRow_C(const uint8* src_rgb565, uint8* dst_y, int width) {
   int x;
   for (x = 0; x < width; ++x) {
     uint8 b = src_rgb565[0] & 0x1f;
     uint8 g = (src_rgb565[0] >> 5) | ((src_rgb565[1] & 0x07) << 3);
     uint8 r = src_rgb565[1] >> 3;
     b = (b << 3) | (b >> 2);
     g = (g << 2) | (g >> 4);
     r = (r << 3) | (r >> 2);
     dst_y[0] = RGBToY(r, g, b);
     src_rgb565 += 2;
     dst_y += 1;
   }
 }
 void ARGB1555ToYRow_C(const uint8* src_argb1555, uint8* dst_y, int width) {
   int x;
   for (x = 0; x < width; ++x) {
     uint8 b = src_argb1555[0] & 0x1f;
     uint8 g = (src_argb1555[0] >> 5) | ((src_argb1555[1] & 0x03) << 3);
     uint8 r = (src_argb1555[1] & 0x7c) >> 2;
     b = (b << 3) | (b >> 2);
     g = (g << 3) | (g >> 2);
     r = (r << 3) | (r >> 2);
     dst_y[0] = RGBToY(r, g, b);
     src_argb1555 += 2;
     dst_y += 1;
   }
 }
 void ARGB4444ToYRow_C(const uint8* src_argb4444, uint8* dst_y, int width) {
   int x;
   for (x = 0; x < width; ++x) {
     uint8 b = src_argb4444[0] & 0x0f;
     uint8 g = src_argb4444[0] >> 4;
     uint8 r = src_argb4444[1] & 0x0f;
     b = (b << 4) | b;
     g = (g << 4) | g;
     r = (r << 4) | r;
     dst_y[0] = RGBToY(r, g, b);
     src_argb4444 += 2;
     dst_y += 1;
   }
 }
 void RGB565ToUVRow_C(const uint8* src_rgb565, int src_stride_rgb565,
                      uint8* dst_u, uint8* dst_v, int width) {
   const uint8* next_rgb565 = src_rgb565 + src_stride_rgb565;
   int x;
   for (x = 0; x < width - 1; x += 2) {
     uint8 b0 = src_rgb565[0] & 0x1f;
     uint8 g0 = (src_rgb565[0] >> 5) | ((src_rgb565[1] & 0x07) << 3);
     uint8 r0 = src_rgb565[1] >> 3;
     uint8 b1 = src_rgb565[2] & 0x1f;
     uint8 g1 = (src_rgb565[2] >> 5) | ((src_rgb565[3] & 0x07) << 3);
     uint8 r1 = src_rgb565[3] >> 3;
     uint8 b2 = next_rgb565[0] & 0x1f;
     uint8 g2 = (next_rgb565[0] >> 5) | ((next_rgb565[1] & 0x07) << 3);
     uint8 r2 = next_rgb565[1] >> 3;
     uint8 b3 = next_rgb565[2] & 0x1f;
     uint8 g3 = (next_rgb565[2] >> 5) | ((next_rgb565[3] & 0x07) << 3);
     uint8 r3 = next_rgb565[3] >> 3;
     uint8 b = (b0 + b1 + b2 + b3);  // 565 * 4 = 787.
     uint8 g = (g0 + g1 + g2 + g3);
     uint8 r = (r0 + r1 + r2 + r3);
     b = (b << 1) | (b >> 6);  // 787 -> 888.
     r = (r << 1) | (r >> 6);
     dst_u[0] = RGBToU(r, g, b);
     dst_v[0] = RGBToV(r, g, b);
     src_rgb565 += 4;
     next_rgb565 += 4;
     dst_u += 1;
     dst_v += 1;
   }
   if (width & 1) {
     uint8 b0 = src_rgb565[0] & 0x1f;
     uint8 g0 = (src_rgb565[0] >> 5) | ((src_rgb565[1] & 0x07) << 3);
     uint8 r0 = src_rgb565[1] >> 3;
     uint8 b2 = next_rgb565[0] & 0x1f;
     uint8 g2 = (next_rgb565[0] >> 5) | ((next_rgb565[1] & 0x07) << 3);
     uint8 r2 = next_rgb565[1] >> 3;
     uint8 b = (b0 + b2);  // 565 * 2 = 676.
     uint8 g = (g0 + g2);
     uint8 r = (r0 + r2);
     b = (b << 2) | (b >> 4);  // 676 -> 888
     g = (g << 1) | (g >> 6);
     r = (r << 2) | (r >> 4);
     dst_u[0] = RGBToU(r, g, b);
     dst_v[0] = RGBToV(r, g, b);
   }
 }
 void ARGB1555ToUVRow_C(const uint8* src_argb1555, int src_stride_argb1555,
                        uint8* dst_u, uint8* dst_v, int width) {
   const uint8* next_argb1555 = src_argb1555 + src_stride_argb1555;
   int x;
   for (x = 0; x < width - 1; x += 2) {
     uint8 b0 = src_argb1555[0] & 0x1f;
     uint8 g0 = (src_argb1555[0] >> 5) | ((src_argb1555[1] & 0x03) << 3);
     uint8 r0 = (src_argb1555[1] & 0x7c) >> 2;
     uint8 b1 = src_argb1555[2] & 0x1f;
     uint8 g1 = (src_argb1555[2] >> 5) | ((src_argb1555[3] & 0x03) << 3);
     uint8 r1 = (src_argb1555[3] & 0x7c) >> 2;
     uint8 b2 = next_argb1555[0] & 0x1f;
     uint8 g2 = (next_argb1555[0] >> 5) | ((next_argb1555[1] & 0x03) << 3);
     uint8 r2 = (next_argb1555[1] & 0x7c) >> 2;
     uint8 b3 = next_argb1555[2] & 0x1f;
     uint8 g3 = (next_argb1555[2] >> 5) | ((next_argb1555[3] & 0x03) << 3);
     uint8 r3 = (next_argb1555[3] & 0x7c) >> 2;
     uint8 b = (b0 + b1 + b2 + b3);  // 555 * 4 = 777.
     uint8 g = (g0 + g1 + g2 + g3);
     uint8 r = (r0 + r1 + r2 + r3);
     b = (b << 1) | (b >> 6);  // 777 -> 888.
     g = (g << 1) | (g >> 6);
     r = (r << 1) | (r >> 6);
     dst_u[0] = RGBToU(r, g, b);
     dst_v[0] = RGBToV(r, g, b);
     src_argb1555 += 4;
     next_argb1555 += 4;
     dst_u += 1;
     dst_v += 1;
   }
   if (width & 1) {
     uint8 b0 = src_argb1555[0] & 0x1f;
     uint8 g0 = (src_argb1555[0] >> 5) | ((src_argb1555[1] & 0x03) << 3);
     uint8 r0 = (src_argb1555[1] & 0x7c) >> 2;
     uint8 b2 = next_argb1555[0] & 0x1f;
     uint8 g2 = (next_argb1555[0] >> 5) | ((next_argb1555[1] & 0x03) << 3);
     uint8 r2 = next_argb1555[1] >> 3;
     uint8 b = (b0 + b2);  // 555 * 2 = 666.
     uint8 g = (g0 + g2);
     uint8 r = (r0 + r2);
     b = (b << 2) | (b >> 4);  // 666 -> 888.
     g = (g << 2) | (g >> 4);
     r = (r << 2) | (r >> 4);
     dst_u[0] = RGBToU(r, g, b);
     dst_v[0] = RGBToV(r, g, b);
   }
 }
 void ARGB4444ToUVRow_C(const uint8* src_argb4444, int src_stride_argb4444,
                        uint8* dst_u, uint8* dst_v, int width) {
   const uint8* next_argb4444 = src_argb4444 + src_stride_argb4444;
   int x;
   for (x = 0; x < width - 1; x += 2) {
     uint8 b0 = src_argb4444[0] & 0x0f;
     uint8 g0 = src_argb4444[0] >> 4;
     uint8 r0 = src_argb4444[1] & 0x0f;
     uint8 b1 = src_argb4444[2] & 0x0f;
     uint8 g1 = src_argb4444[2] >> 4;
     uint8 r1 = src_argb4444[3] & 0x0f;
     uint8 b2 = next_argb4444[0] & 0x0f;
     uint8 g2 = next_argb4444[0] >> 4;
     uint8 r2 = next_argb4444[1] & 0x0f;
     uint8 b3 = next_argb4444[2] & 0x0f;
     uint8 g3 = next_argb4444[2] >> 4;
     uint8 r3 = next_argb4444[3] & 0x0f;
     uint8 b = (b0 + b1 + b2 + b3);  // 444 * 4 = 666.
     uint8 g = (g0 + g1 + g2 + g3);
     uint8 r = (r0 + r1 + r2 + r3);
     b = (b << 2) | (b >> 4);  // 666 -> 888.
     g = (g << 2) | (g >> 4);
     r = (r << 2) | (r >> 4);
     dst_u[0] = RGBToU(r, g, b);
     dst_v[0] = RGBToV(r, g, b);
     src_argb4444 += 4;
     next_argb4444 += 4;
     dst_u += 1;
     dst_v += 1;
   }
   if (width & 1) {
     uint8 b0 = src_argb4444[0] & 0x0f;
     uint8 g0 = src_argb4444[0] >> 4;
     uint8 r0 = src_argb4444[1] & 0x0f;
     uint8 b2 = next_argb4444[0] & 0x0f;
     uint8 g2 = next_argb4444[0] >> 4;
     uint8 r2 = next_argb4444[1] & 0x0f;
     uint8 b = (b0 + b2);  // 444 * 2 = 555.
     uint8 g = (g0 + g2);
     uint8 r = (r0 + r2);
     b = (b << 3) | (b >> 2);  // 555 -> 888.
     g = (g << 3) | (g >> 2);
     r = (r << 3) | (r >> 2);
     dst_u[0] = RGBToU(r, g, b);
     dst_v[0] = RGBToV(r, g, b);
   }
 }
 void ARGBToUV444Row_C(const uint8* src_argb,
                       uint8* dst_u, uint8* dst_v, int width) {
   int x;
   for (x = 0; x < width; ++x) {
     uint8 ab = src_argb[0];
     uint8 ag = src_argb[1];
     uint8 ar = src_argb[2];
     dst_u[0] = RGBToU(ar, ag, ab);
     dst_v[0] = RGBToV(ar, ag, ab);
     src_argb += 4;
     dst_u += 1;
     dst_v += 1;
   }
 }
 void ARGBToUV422Row_C(const uint8* src_argb,
                       uint8* dst_u, uint8* dst_v, int width) {
   int x;
   for (x = 0; x < width - 1; x += 2) {
     uint8 ab = (src_argb[0] + src_argb[4]) >> 1;
     uint8 ag = (src_argb[1] + src_argb[5]) >> 1;
     uint8 ar = (src_argb[2] + src_argb[6]) >> 1;
     dst_u[0] = RGBToU(ar, ag, ab);
     dst_v[0] = RGBToV(ar, ag, ab);
     src_argb += 8;
     dst_u += 1;
     dst_v += 1;
   }
   if (width & 1) {
     uint8 ab = src_argb[0];
     uint8 ag = src_argb[1];
     uint8 ar = src_argb[2];
     dst_u[0] = RGBToU(ar, ag, ab);
     dst_v[0] = RGBToV(ar, ag, ab);
   }
 }
 void ARGBToUV411Row_C(const uint8* src_argb,
                       uint8* dst_u, uint8* dst_v, int width) {
   int x;
   for (x = 0; x < width - 3; x += 4) {
     uint8 ab = (src_argb[0] + src_argb[4] + src_argb[8] + src_argb[12]) >> 2;
     uint8 ag = (src_argb[1] + src_argb[5] + src_argb[9] + src_argb[13]) >> 2;
     uint8 ar = (src_argb[2] + src_argb[6] + src_argb[10] + src_argb[14]) >> 2;
     dst_u[0] = RGBToU(ar, ag, ab);
     dst_v[0] = RGBToV(ar, ag, ab);
     src_argb += 16;
     dst_u += 1;
     dst_v += 1;
   }
   if ((width & 3) == 3) {
     uint8 ab = (src_argb[0] + src_argb[4] + src_argb[8]) / 3;
     uint8 ag = (src_argb[1] + src_argb[5] + src_argb[9]) / 3;
     uint8 ar = (src_argb[2] + src_argb[6] + src_argb[10]) / 3;
     dst_u[0] = RGBToU(ar, ag, ab);
     dst_v[0] = RGBToV(ar, ag, ab);
   } else if ((width & 3) == 2) {
     uint8 ab = (src_argb[0] + src_argb[4]) >> 1;
     uint8 ag = (src_argb[1] + src_argb[5]) >> 1;
     uint8 ar = (src_argb[2] + src_argb[6]) >> 1;
     dst_u[0] = RGBToU(ar, ag, ab);
     dst_v[0] = RGBToV(ar, ag, ab);
   } else if ((width & 3) == 1) {
     uint8 ab = src_argb[0];
     uint8 ag = src_argb[1];
     uint8 ar = src_argb[2];
     dst_u[0] = RGBToU(ar, ag, ab);
     dst_v[0] = RGBToV(ar, ag, ab);
   }
 }
 void ARGBGrayRow_C(const uint8* src_argb, uint8* dst_argb, int width) {
   int x;
   for (x = 0; x < width; ++x) {
     uint8 y = RGBToYJ(src_argb[2], src_argb[1], src_argb[0]);
     dst_argb[2] = dst_argb[1] = dst_argb[0] = y;
     dst_argb[3] = src_argb[3];
     dst_argb += 4;
     src_argb += 4;
   }
 }
 // Convert a row of image to Sepia tone.
 void ARGBSepiaRow_C(uint8* dst_argb, int width) {
   int x;
   for (x = 0; x < width; ++x) {
     int b = dst_argb[0];
     int g = dst_argb[1];
     int r = dst_argb[2];
     int sb = (b * 17 + g * 68 + r * 35) >> 7;
     int sg = (b * 22 + g * 88 + r * 45) >> 7;
     int sr = (b * 24 + g * 98 + r * 50) >> 7;
     // b does not over flow. a is preserved from original.
     dst_argb[0] = sb;
     dst_argb[1] = clamp255(sg);
     dst_argb[2] = clamp255(sr);
     dst_argb += 4;
   }
 }
 // Apply color matrix to a row of image. Matrix is signed.
 // TODO(fbarchard): Consider adding rounding (+32).
 void ARGBColorMatrixRow_C(const uint8* src_argb, uint8* dst_argb,
                           const int8* matrix_argb, int width) {
   int x;
   for (x = 0; x < width; ++x) {
     int b = src_argb[0];
     int g = src_argb[1];
     int r = src_argb[2];
     int a = src_argb[3];
     int sb = (b * matrix_argb[0] + g * matrix_argb[1] +
               r * matrix_argb[2] + a * matrix_argb[3]) >> 6;
     int sg = (b * matrix_argb[4] + g * matrix_argb[5] +
               r * matrix_argb[6] + a * matrix_argb[7]) >> 6;
     int sr = (b * matrix_argb[8] + g * matrix_argb[9] +
               r * matrix_argb[10] + a * matrix_argb[11]) >> 6;
     int sa = (b * matrix_argb[12] + g * matrix_argb[13] +
               r * matrix_argb[14] + a * matrix_argb[15]) >> 6;
     dst_argb[0] = Clamp(sb);
     dst_argb[1] = Clamp(sg);
     dst_argb[2] = Clamp(sr);
     dst_argb[3] = Clamp(sa);
     src_argb += 4;
     dst_argb += 4;
   }
 }
 // Apply color table to a row of image.
 void ARGBColorTableRow_C(uint8* dst_argb, const uint8* table_argb, int width) {
   int x;
   for (x = 0; x < width; ++x) {
     int b = dst_argb[0];
     int g = dst_argb[1];
     int r = dst_argb[2];
     int a = dst_argb[3];
     dst_argb[0] = table_argb[b * 4 + 0];
     dst_argb[1] = table_argb[g * 4 + 1];
     dst_argb[2] = table_argb[r * 4 + 2];
     dst_argb[3] = table_argb[a * 4 + 3];
     dst_argb += 4;
   }
 }
 // Apply color table to a row of image.
 void RGBColorTableRow_C(uint8* dst_argb, const uint8* table_argb, int width) {
   int x;
   for (x = 0; x < width; ++x) {
     int b = dst_argb[0];
     int g = dst_argb[1];
     int r = dst_argb[2];
     dst_argb[0] = table_argb[b * 4 + 0];
     dst_argb[1] = table_argb[g * 4 + 1];
     dst_argb[2] = table_argb[r * 4 + 2];
     dst_argb += 4;
   }
 }
 void ARGBQuantizeRow_C(uint8* dst_argb, int scale, int interval_size,
                        int interval_offset, int width) {
   int x;
   for (x = 0; x < width; ++x) {
     int b = dst_argb[0];
     int g = dst_argb[1];
     int r = dst_argb[2];
     dst_argb[0] = (b * scale >> 16) * interval_size + interval_offset;
     dst_argb[1] = (g * scale >> 16) * interval_size + interval_offset;
     dst_argb[2] = (r * scale >> 16) * interval_size + interval_offset;
     dst_argb += 4;
   }
 }
 #define REPEAT8(v) (v) | ((v) << 8)
 #define SHADE(f, v) v * f >> 24
 void ARGBShadeRow_C(const uint8* src_argb, uint8* dst_argb, int width,
                     uint32 value) {
   const uint32 b_scale = REPEAT8(value & 0xff);
   const uint32 g_scale = REPEAT8((value >> 8) & 0xff);
   const uint32 r_scale = REPEAT8((value >> 16) & 0xff);
   const uint32 a_scale = REPEAT8(value >> 24);
   int i;
   for (i = 0; i < width; ++i) {
     const uint32 b = REPEAT8(src_argb[0]);
     const uint32 g = REPEAT8(src_argb[1]);
     const uint32 r = REPEAT8(src_argb[2]);
     const uint32 a = REPEAT8(src_argb[3]);
     dst_argb[0] = SHADE(b, b_scale);
     dst_argb[1] = SHADE(g, g_scale);
     dst_argb[2] = SHADE(r, r_scale);
     dst_argb[3] = SHADE(a, a_scale);
     src_argb += 4;
     dst_argb += 4;
   }
 }
 #undef REPEAT8
 #undef SHADE
 #define REPEAT8(v) (v) | ((v) << 8)
 #define SHADE(f, v) v * f >> 16
 void ARGBMultiplyRow_C(const uint8* src_argb0, const uint8* src_argb1,
                        uint8* dst_argb, int width) {
   int i;
   for (i = 0; i < width; ++i) {
     const uint32 b = REPEAT8(src_argb0[0]);
     const uint32 g = REPEAT8(src_argb0[1]);
     const uint32 r = REPEAT8(src_argb0[2]);
     const uint32 a = REPEAT8(src_argb0[3]);
     const uint32 b_scale = src_argb1[0];
     const uint32 g_scale = src_argb1[1];
     const uint32 r_scale = src_argb1[2];
     const uint32 a_scale = src_argb1[3];
     dst_argb[0] = SHADE(b, b_scale);
     dst_argb[1] = SHADE(g, g_scale);
     dst_argb[2] = SHADE(r, r_scale);
     dst_argb[3] = SHADE(a, a_scale);
     src_argb0 += 4;
     src_argb1 += 4;
     dst_argb += 4;
   }
 }
 #undef REPEAT8
 #undef SHADE
 #define SHADE(f, v) clamp255(v + f)
 void ARGBAddRow_C(const uint8* src_argb0, const uint8* src_argb1,
                   uint8* dst_argb, int width) {
   int i;
   for (i = 0; i < width; ++i) {
     const int b = src_argb0[0];
     const int g = src_argb0[1];
     const int r = src_argb0[2];
     const int a = src_argb0[3];
     const int b_add = src_argb1[0];
     const int g_add = src_argb1[1];
     const int r_add = src_argb1[2];
     const int a_add = src_argb1[3];
     dst_argb[0] = SHADE(b, b_add);
     dst_argb[1] = SHADE(g, g_add);
     dst_argb[2] = SHADE(r, r_add);
     dst_argb[3] = SHADE(a, a_add);
     src_argb0 += 4;
     src_argb1 += 4;
     dst_argb += 4;
   }
 }
 #undef SHADE
 #define SHADE(f, v) clamp0(f - v)
 void ARGBSubtractRow_C(const uint8* src_argb0, const uint8* src_argb1,
                        uint8* dst_argb, int width) {
   int i;
   for (i = 0; i < width; ++i) {
     const int b = src_argb0[0];
     const int g = src_argb0[1];
     const int r = src_argb0[2];
     const int a = src_argb0[3];
     const int b_sub = src_argb1[0];
     const int g_sub = src_argb1[1];
     const int r_sub = src_argb1[2];
     const int a_sub = src_argb1[3];
     dst_argb[0] = SHADE(b, b_sub);
     dst_argb[1] = SHADE(g, g_sub);
     dst_argb[2] = SHADE(r, r_sub);
     dst_argb[3] = SHADE(a, a_sub);
     src_argb0 += 4;
     src_argb1 += 4;
     dst_argb += 4;
   }
 }
 #undef SHADE
 // Sobel functions which mimics SSSE3.
 void SobelXRow_C(const uint8* src_y0, const uint8* src_y1, const uint8* src_y2,
                  uint8* dst_sobelx, int width) {
   int i;
   for (i = 0; i < width; ++i) {
     int a = src_y0[i];
     int b = src_y1[i];
     int c = src_y2[i];
     int a_sub = src_y0[i + 2];
     int b_sub = src_y1[i + 2];
     int c_sub = src_y2[i + 2];
     int a_diff = a - a_sub;
     int b_diff = b - b_sub;
     int c_diff = c - c_sub;
     int sobel = Abs(a_diff + b_diff * 2 + c_diff);
     dst_sobelx[i] = (uint8)(clamp255(sobel));
   }
 }
 void SobelYRow_C(const uint8* src_y0, const uint8* src_y1,
                  uint8* dst_sobely, int width) {
   int i;
   for (i = 0; i < width; ++i) {
     int a = src_y0[i + 0];
     int b = src_y0[i + 1];
     int c = src_y0[i + 2];
     int a_sub = src_y1[i + 0];
     int b_sub = src_y1[i + 1];
     int c_sub = src_y1[i + 2];
     int a_diff = a - a_sub;
     int b_diff = b - b_sub;
     int c_diff = c - c_sub;
     int sobel = Abs(a_diff + b_diff * 2 + c_diff);
     dst_sobely[i] = (uint8)(clamp255(sobel));
   }
 }
 void SobelRow_C(const uint8* src_sobelx, const uint8* src_sobely,
                 uint8* dst_argb, int width) {
   int i;
   for (i = 0; i < width; ++i) {
     int r = src_sobelx[i];
     int b = src_sobely[i];
     int s = clamp255(r + b);
     dst_argb[0] = (uint8)(s);
     dst_argb[1] = (uint8)(s);
     dst_argb[2] = (uint8)(s);
     dst_argb[3] = (uint8)(255u);
     dst_argb += 4;
   }
 }
 void SobelToPlaneRow_C(const uint8* src_sobelx, const uint8* src_sobely,
                        uint8* dst_y, int width) {
   int i;
   for (i = 0; i < width; ++i) {
     int r = src_sobelx[i];
     int b = src_sobely[i];
     int s = clamp255(r + b);
     dst_y[i] = (uint8)(s);
   }
 }
 void SobelXYRow_C(const uint8* src_sobelx, const uint8* src_sobely,
                   uint8* dst_argb, int width) {
   int i;
   for (i = 0; i < width; ++i) {
     int r = src_sobelx[i];
     int b = src_sobely[i];
     int g = clamp255(r + b);
     dst_argb[0] = (uint8)(b);
     dst_argb[1] = (uint8)(g);
     dst_argb[2] = (uint8)(r);
     dst_argb[3] = (uint8)(255u);
     dst_argb += 4;
   }
 }
 void I400ToARGBRow_C(const uint8* src_y, uint8* dst_argb, int width) {
   // Copy a Y to RGB.
   int x;
   for (x = 0; x < width; ++x) {
     uint8 y = src_y[0];
     dst_argb[2] = dst_argb[1] = dst_argb[0] = y;
     dst_argb[3] = 255u;
     dst_argb += 4;
     ++src_y;
   }
 }
 // C reference code that mimics the YUV assembly.
 #define YG 74 /* (int8)(1.164 * 64 + 0.5) */
 #define UB 127 /* min(63,(int8)(2.018 * 64)) */
 #define UG -25 /* (int8)(-0.391 * 64 - 0.5) */
 #define UR 0
 #define VB 0
 #define VG -52 /* (int8)(-0.813 * 64 - 0.5) */
 #define VR 102 /* (int8)(1.596 * 64 + 0.5) */
 // Bias
 #define BB UB * 128 + VB * 128
 #define BG UG * 128 + VG * 128
 #define BR UR * 128 + VR * 128
 static __inline void YuvPixel(uint8 y, uint8 u, uint8 v,
                               uint8* b, uint8* g, uint8* r) {
   int32 y1 = ((int32)(y) - 16) * YG;
   *b = Clamp((int32)((u * UB + v * VB) - (BB) + y1) >> 6);
   *g = Clamp((int32)((u * UG + v * VG) - (BG) + y1) >> 6);
   *r = Clamp((int32)((u * UR + v * VR) - (BR) + y1) >> 6);
 }
 #if !defined(LIBYUV_DISABLE_NEON) && \
     (defined(__ARM_NEON__) || defined(LIBYUV_NEON))
 // C mimic assembly.
 // TODO(fbarchard): Remove subsampling from Neon.
 void I444ToARGBRow_C(const uint8* src_y,
                      const uint8* src_u,
                      const uint8* src_v,
                      uint8* rgb_buf,
                      int width) {
   int x;
   for (x = 0; x < width - 1; x += 2) {
     uint8 u = (src_u[0] + src_u[1] + 1) >> 1;
     uint8 v = (src_v[0] + src_v[1] + 1) >> 1;
     YuvPixel(src_y[0], u, v, rgb_buf + 0, rgb_buf + 1, rgb_buf + 2);
     rgb_buf[3] = 255;
     YuvPixel(src_y[1], u, v, rgb_buf + 4, rgb_buf + 5, rgb_buf + 6);
     rgb_buf[7] = 255;
     src_y += 2;
     src_u += 2;
     src_v += 2;
     rgb_buf += 8;  // Advance 2 pixels.
   }
   if (width & 1) {
     YuvPixel(src_y[0], src_u[0], src_v[0],
              rgb_buf + 0, rgb_buf + 1, rgb_buf + 2);
   }
 }
 #else
 void I444ToARGBRow_C(const uint8* src_y,
                      const uint8* src_u,
                      const uint8* src_v,
                      uint8* rgb_buf,
                      int width) {
   int x;
   for (x = 0; x < width; ++x) {
     YuvPixel(src_y[0], src_u[0], src_v[0],
              rgb_buf + 0, rgb_buf + 1, rgb_buf + 2);
     rgb_buf[3] = 255;
     src_y += 1;
     src_u += 1;
     src_v += 1;
     rgb_buf += 4;  // Advance 1 pixel.
   }
 }
 #endif
 // Also used for 420
 void I422ToARGBRow_C(const uint8* src_y,
                      const uint8* src_u,
                      const uint8* src_v,
                      uint8* rgb_buf,
                      int width) {
   int x;
   for (x = 0; x < width - 1; x += 2) {
     YuvPixel(src_y[0], src_u[0], src_v[0],
              rgb_buf + 0, rgb_buf + 1, rgb_buf + 2);
     rgb_buf[3] = 255;
     YuvPixel(src_y[1], src_u[0], src_v[0],
              rgb_buf + 4, rgb_buf + 5, rgb_buf + 6);
     rgb_buf[7] = 255;
     src_y += 2;
     src_u += 1;
     src_v += 1;
     rgb_buf += 8;  // Advance 2 pixels.
   }
   if (width & 1) {
     YuvPixel(src_y[0], src_u[0], src_v[0],
              rgb_buf + 0, rgb_buf + 1, rgb_buf + 2);
     rgb_buf[3] = 255;
   }
 }
 void I422ToRGB24Row_C(const uint8* src_y,
                       const uint8* src_u,
                       const uint8* src_v,
                       uint8* rgb_buf,
                       int width) {
   int x;
   for (x = 0; x < width - 1; x += 2) {
     YuvPixel(src_y[0], src_u[0], src_v[0],
              rgb_buf + 0, rgb_buf + 1, rgb_buf + 2);
     YuvPixel(src_y[1], src_u[0], src_v[0],
              rgb_buf + 3, rgb_buf + 4, rgb_buf + 5);
     src_y += 2;
     src_u += 1;
     src_v += 1;
     rgb_buf += 6;  // Advance 2 pixels.
   }
   if (width & 1) {
     YuvPixel(src_y[0], src_u[0], src_v[0],
              rgb_buf + 0, rgb_buf + 1, rgb_buf + 2);
   }
 }
 void I422ToRAWRow_C(const uint8* src_y,
                     const uint8* src_u,
                     const uint8* src_v,
                     uint8* rgb_buf,
                     int width) {
   int x;
   for (x = 0; x < width - 1; x += 2) {
     YuvPixel(src_y[0], src_u[0], src_v[0],
              rgb_buf + 2, rgb_buf + 1, rgb_buf + 0);
     YuvPixel(src_y[1], src_u[0], src_v[0],
              rgb_buf + 5, rgb_buf + 4, rgb_buf + 3);
     src_y += 2;
     src_u += 1;
     src_v += 1;
     rgb_buf += 6;  // Advance 2 pixels.
   }
   if (width & 1) {
     YuvPixel(src_y[0], src_u[0], src_v[0],
              rgb_buf + 2, rgb_buf + 1, rgb_buf + 0);
   }
 }
 void I422ToARGB4444Row_C(const uint8* src_y,
                          const uint8* src_u,
                          const uint8* src_v,
                          uint8* dst_argb4444,
                          int width) {
   uint8 b0;
   uint8 g0;
   uint8 r0;
   uint8 b1;
   uint8 g1;
   uint8 r1;
   int x;
   for (x = 0; x < width - 1; x += 2) {
     YuvPixel(src_y[0], src_u[0], src_v[0], &b0, &g0, &r0);
     YuvPixel(src_y[1], src_u[0], src_v[0], &b1, &g1, &r1);
     b0 = b0 >> 4;
     g0 = g0 >> 4;
     r0 = r0 >> 4;
     b1 = b1 >> 4;
     g1 = g1 >> 4;
     r1 = r1 >> 4;
     *(uint32*)(dst_argb4444) = b0 | (g0 << 4) | (r0 << 8) |
         (b1 << 16) | (g1 << 20) | (r1 << 24) | 0xf000f000;
     src_y += 2;
     src_u += 1;
     src_v += 1;
     dst_argb4444 += 4;  // Advance 2 pixels.
   }
   if (width & 1) {
     YuvPixel(src_y[0], src_u[0], src_v[0], &b0, &g0, &r0);
     b0 = b0 >> 4;
     g0 = g0 >> 4;
     r0 = r0 >> 4;
     *(uint16*)(dst_argb4444) = b0 | (g0 << 4) | (r0 << 8) |
 xf000;
   }
 }
 void I422ToARGB1555Row_C(const uint8* src_y,
                          const uint8* src_u,
                          const uint8* src_v,
                          uint8* dst_argb1555,
                          int width) {
   uint8 b0;
   uint8 g0;
   uint8 r0;
   uint8 b1;
   uint8 g1;
   uint8 r1;
   int x;
   for (x = 0; x < width - 1; x += 2) {
     YuvPixel(src_y[0], src_u[0], src_v[0], &b0, &g0, &r0);
     YuvPixel(src_y[1], src_u[0], src_v[0], &b1, &g1, &r1);
     b0 = b0 >> 3;
     g0 = g0 >> 3;
     r0 = r0 >> 3;
     b1 = b1 >> 3;
     g1 = g1 >> 3;
     r1 = r1 >> 3;
     *(uint32*)(dst_argb1555) = b0 | (g0 << 5) | (r0 << 10) |
         (b1 << 16) | (g1 << 21) | (r1 << 26) | 0x80008000;
     src_y += 2;
     src_u += 1;
     src_v += 1;
     dst_argb1555 += 4;  // Advance 2 pixels.
   }
   if (width & 1) {
     YuvPixel(src_y[0], src_u[0], src_v[0], &b0, &g0, &r0);
     b0 = b0 >> 3;
     g0 = g0 >> 3;
     r0 = r0 >> 3;
     *(uint16*)(dst_argb1555) = b0 | (g0 << 5) | (r0 << 10) |
 x8000;
   }
 }
 void I422ToRGB565Row_C(const uint8* src_y,
                        const uint8* src_u,
                        const uint8* src_v,
                        uint8* dst_rgb565,
                        int width) {
   uint8 b0;
   uint8 g0;
   uint8 r0;
   uint8 b1;
   uint8 g1;
   uint8 r1;
   int x;
   for (x = 0; x < width - 1; x += 2) {
     YuvPixel(src_y[0], src_u[0], src_v[0], &b0, &g0, &r0);
     YuvPixel(src_y[1], src_u[0], src_v[0], &b1, &g1, &r1);
     b0 = b0 >> 3;
     g0 = g0 >> 2;
     r0 = r0 >> 3;
     b1 = b1 >> 3;
     g1 = g1 >> 2;
     r1 = r1 >> 3;
     *(uint32*)(dst_rgb565) = b0 | (g0 << 5) | (r0 << 11) |
         (b1 << 16) | (g1 << 21) | (r1 << 27);
     src_y += 2;
     src_u += 1;
     src_v += 1;
     dst_rgb565 += 4;  // Advance 2 pixels.
   }
   if (width & 1) {
     YuvPixel(src_y[0], src_u[0], src_v[0], &b0, &g0, &r0);
     b0 = b0 >> 3;
     g0 = g0 >> 2;
     r0 = r0 >> 3;
     *(uint16*)(dst_rgb565) = b0 | (g0 << 5) | (r0 << 11);
   }
 }
 void I411ToARGBRow_C(const uint8* src_y,
                      const uint8* src_u,
                      const uint8* src_v,
                      uint8* rgb_buf,
                      int width) {
   int x;
   for (x = 0; x < width - 3; x += 4) {
     YuvPixel(src_y[0], src_u[0], src_v[0],
              rgb_buf + 0, rgb_buf + 1, rgb_buf + 2);
     rgb_buf[3] = 255;
     YuvPixel(src_y[1], src_u[0], src_v[0],
              rgb_buf + 4, rgb_buf + 5, rgb_buf + 6);
     rgb_buf[7] = 255;
     YuvPixel(src_y[2], src_u[0], src_v[0],
              rgb_buf + 8, rgb_buf + 9, rgb_buf + 10);
     rgb_buf[11] = 255;
     YuvPixel(src_y[3], src_u[0], src_v[0],
              rgb_buf + 12, rgb_buf + 13, rgb_buf + 14);
     rgb_buf[15] = 255;
     src_y += 4;
     src_u += 1;
     src_v += 1;
     rgb_buf += 16;  // Advance 4 pixels.
   }
   if (width & 2) {
     YuvPixel(src_y[0], src_u[0], src_v[0],
              rgb_buf + 0, rgb_buf + 1, rgb_buf + 2);
     rgb_buf[3] = 255;
     YuvPixel(src_y[1], src_u[0], src_v[0],
              rgb_buf + 4, rgb_buf + 5, rgb_buf + 6);
     rgb_buf[7] = 255;
     src_y += 2;
     rgb_buf += 8;  // Advance 2 pixels.
   }
   if (width & 1) {
     YuvPixel(src_y[0], src_u[0], src_v[0],
              rgb_buf + 0, rgb_buf + 1, rgb_buf + 2);
     rgb_buf[3] = 255;
   }
 }
 void NV12ToARGBRow_C(const uint8* src_y,
                      const uint8* usrc_v,
                      uint8* rgb_buf,
                      int width) {
   int x;
   for (x = 0; x < width - 1; x += 2) {
     YuvPixel(src_y[0], usrc_v[0], usrc_v[1],
              rgb_buf + 0, rgb_buf + 1, rgb_buf + 2);
     rgb_buf[3] = 255;
     YuvPixel(src_y[1], usrc_v[0], usrc_v[1],
              rgb_buf + 4, rgb_buf + 5, rgb_buf + 6);
     rgb_buf[7] = 255;
     src_y += 2;
     usrc_v += 2;
     rgb_buf += 8;  // Advance 2 pixels.
   }
   if (width & 1) {
     YuvPixel(src_y[0], usrc_v[0], usrc_v[1],
              rgb_buf + 0, rgb_buf + 1, rgb_buf + 2);
     rgb_buf[3] = 255;
   }
 }
 void NV21ToARGBRow_C(const uint8* src_y,
                      const uint8* src_vu,
                      uint8* rgb_buf,
                      int width) {
   int x;
   for (x = 0; x < width - 1; x += 2) {
     YuvPixel(src_y[0], src_vu[1], src_vu[0],
              rgb_buf + 0, rgb_buf + 1, rgb_buf + 2);
     rgb_buf[3] = 255;
     YuvPixel(src_y[1], src_vu[1], src_vu[0],
              rgb_buf + 4, rgb_buf + 5, rgb_buf + 6);
     rgb_buf[7] = 255;
     src_y += 2;
     src_vu += 2;
     rgb_buf += 8;  // Advance 2 pixels.
   }
   if (width & 1) {
     YuvPixel(src_y[0], src_vu[1], src_vu[0],
              rgb_buf + 0, rgb_buf + 1, rgb_buf + 2);
     rgb_buf[3] = 255;
   }
 }
 void NV12ToRGB565Row_C(const uint8* src_y,
                        const uint8* usrc_v,
                        uint8* dst_rgb565,
                        int width) {
   uint8 b0;
   uint8 g0;
   uint8 r0;
   uint8 b1;
   uint8 g1;
   uint8 r1;
   int x;
   for (x = 0; x < width - 1; x += 2) {
     YuvPixel(src_y[0], usrc_v[0], usrc_v[1], &b0, &g0, &r0);
     YuvPixel(src_y[1], usrc_v[0], usrc_v[1], &b1, &g1, &r1);
     b0 = b0 >> 3;
     g0 = g0 >> 2;
     r0 = r0 >> 3;
     b1 = b1 >> 3;
     g1 = g1 >> 2;
     r1 = r1 >> 3;
     *(uint32*)(dst_rgb565) = b0 | (g0 << 5) | (r0 << 11) |
         (b1 << 16) | (g1 << 21) | (r1 << 27);
     src_y += 2;
     usrc_v += 2;
     dst_rgb565 += 4;  // Advance 2 pixels.
   }
   if (width & 1) {
     YuvPixel(src_y[0], usrc_v[0], usrc_v[1], &b0, &g0, &r0);
     b0 = b0 >> 3;
     g0 = g0 >> 2;
     r0 = r0 >> 3;
     *(uint16*)(dst_rgb565) = b0 | (g0 << 5) | (r0 << 11);
   }
 }
 void NV21ToRGB565Row_C(const uint8* src_y,
                        const uint8* vsrc_u,
                        uint8* dst_rgb565,
                        int width) {
   uint8 b0;
   uint8 g0;
   uint8 r0;
   uint8 b1;
   uint8 g1;
   uint8 r1;
   int x;
   for (x = 0; x < width - 1; x += 2) {
     YuvPixel(src_y[0], vsrc_u[1], vsrc_u[0], &b0, &g0, &r0);
     YuvPixel(src_y[1], vsrc_u[1], vsrc_u[0], &b1, &g1, &r1);
     b0 = b0 >> 3;
     g0 = g0 >> 2;
     r0 = r0 >> 3;
     b1 = b1 >> 3;
     g1 = g1 >> 2;
     r1 = r1 >> 3;
     *(uint32*)(dst_rgb565) = b0 | (g0 << 5) | (r0 << 11) |
         (b1 << 16) | (g1 << 21) | (r1 << 27);
     src_y += 2;
     vsrc_u += 2;
     dst_rgb565 += 4;  // Advance 2 pixels.
   }
   if (width & 1) {
     YuvPixel(src_y[0], vsrc_u[1], vsrc_u[0], &b0, &g0, &r0);
     b0 = b0 >> 3;
     g0 = g0 >> 2;
     r0 = r0 >> 3;
     *(uint16*)(dst_rgb565) = b0 | (g0 << 5) | (r0 << 11);
   }
 }
 void YUY2ToARGBRow_C(const uint8* src_yuy2,
                      uint8* rgb_buf,
                      int width) {
   int x;
   for (x = 0; x < width - 1; x += 2) {
     YuvPixel(src_yuy2[0], src_yuy2[1], src_yuy2[3],
              rgb_buf + 0, rgb_buf + 1, rgb_buf + 2);
     rgb_buf[3] = 255;
     YuvPixel(src_yuy2[2], src_yuy2[1], src_yuy2[3],
              rgb_buf + 4, rgb_buf + 5, rgb_buf + 6);
     rgb_buf[7] = 255;
     src_yuy2 += 4;
     rgb_buf += 8;  // Advance 2 pixels.
   }
   if (width & 1) {
     YuvPixel(src_yuy2[0], src_yuy2[1], src_yuy2[3],
              rgb_buf + 0, rgb_buf + 1, rgb_buf + 2);
     rgb_buf[3] = 255;
   }
 }
 void UYVYToARGBRow_C(const uint8* src_uyvy,
                      uint8* rgb_buf,
                      int width) {
   int x;
   for (x = 0; x < width - 1; x += 2) {
     YuvPixel(src_uyvy[1], src_uyvy[0], src_uyvy[2],
              rgb_buf + 0, rgb_buf + 1, rgb_buf + 2);
     rgb_buf[3] = 255;
     YuvPixel(src_uyvy[3], src_uyvy[0], src_uyvy[2],
              rgb_buf + 4, rgb_buf + 5, rgb_buf + 6);
     rgb_buf[7] = 255;
     src_uyvy += 4;
     rgb_buf += 8;  // Advance 2 pixels.
   }
   if (width & 1) {
     YuvPixel(src_uyvy[1], src_uyvy[0], src_uyvy[2],
              rgb_buf + 0, rgb_buf + 1, rgb_buf + 2);
     rgb_buf[3] = 255;
   }
 }
 void I422ToBGRARow_C(const uint8* src_y,
                      const uint8* src_u,
                      const uint8* src_v,
                      uint8* rgb_buf,
                      int width) {
   int x;
   for (x = 0; x < width - 1; x += 2) {
     YuvPixel(src_y[0], src_u[0], src_v[0],
              rgb_buf + 3, rgb_buf + 2, rgb_buf + 1);
     rgb_buf[0] = 255;
     YuvPixel(src_y[1], src_u[0], src_v[0],
              rgb_buf + 7, rgb_buf + 6, rgb_buf + 5);
     rgb_buf[4] = 255;
     src_y += 2;
     src_u += 1;
     src_v += 1;
     rgb_buf += 8;  // Advance 2 pixels.
   }
   if (width & 1) {
     YuvPixel(src_y[0], src_u[0], src_v[0],
              rgb_buf + 3, rgb_buf + 2, rgb_buf + 1);
     rgb_buf[0] = 255;
   }
 }
 void I422ToABGRRow_C(const uint8* src_y,
                      const uint8* src_u,
                      const uint8* src_v,
                      uint8* rgb_buf,
                      int width) {
   int x;
   for (x = 0; x < width - 1; x += 2) {
     YuvPixel(src_y[0], src_u[0], src_v[0],
              rgb_buf + 2, rgb_buf + 1, rgb_buf + 0);
     rgb_buf[3] = 255;
     YuvPixel(src_y[1], src_u[0], src_v[0],
              rgb_buf + 6, rgb_buf + 5, rgb_buf + 4);
     rgb_buf[7] = 255;
     src_y += 2;
     src_u += 1;
     src_v += 1;
     rgb_buf += 8;  // Advance 2 pixels.
   }
   if (width & 1) {
     YuvPixel(src_y[0], src_u[0], src_v[0],
              rgb_buf + 2, rgb_buf + 1, rgb_buf + 0);
     rgb_buf[3] = 255;
   }
 }
 void I422ToRGBARow_C(const uint8* src_y,
                      const uint8* src_u,
                      const uint8* src_v,
                      uint8* rgb_buf,
                      int width) {
   int x;
   for (x = 0; x < width - 1; x += 2) {
     YuvPixel(src_y[0], src_u[0], src_v[0],
              rgb_buf + 1, rgb_buf + 2, rgb_buf + 3);
     rgb_buf[0] = 255;
     YuvPixel(src_y[1], src_u[0], src_v[0],
              rgb_buf + 5, rgb_buf + 6, rgb_buf + 7);
     rgb_buf[4] = 255;
     src_y += 2;
     src_u += 1;
     src_v += 1;
     rgb_buf += 8;  // Advance 2 pixels.
   }
   if (width & 1) {
     YuvPixel(src_y[0], src_u[0], src_v[0],
              rgb_buf + 1, rgb_buf + 2, rgb_buf + 3);
     rgb_buf[0] = 255;
   }
 }
 void YToARGBRow_C(const uint8* src_y, uint8* rgb_buf, int width) {
   int x;
   for (x = 0; x < width - 1; x += 2) {
     YuvPixel(src_y[0], 128, 128,
              rgb_buf + 0, rgb_buf + 1, rgb_buf + 2);
     rgb_buf[3] = 255;
     YuvPixel(src_y[1], 128, 128,
              rgb_buf + 4, rgb_buf + 5, rgb_buf + 6);
     rgb_buf[7] = 255;
     src_y += 2;
     rgb_buf += 8;  // Advance 2 pixels.
   }
   if (width & 1) {
     YuvPixel(src_y[0], 128, 128,
              rgb_buf + 0, rgb_buf + 1, rgb_buf + 2);
     rgb_buf[3] = 255;
   }
 }
 void MirrorRow_C(const uint8* src, uint8* dst, int width) {
   int x;
   src += width - 1;
   for (x = 0; x < width - 1; x += 2) {
     dst[x] = src[0];
     dst[x + 1] = src[-1];
     src -= 2;
   }
   if (width & 1) {
     dst[width - 1] = src[0];
   }
 }
 void MirrorUVRow_C(const uint8* src_uv, uint8* dst_u, uint8* dst_v, int width) {
   int x;
   src_uv += (width - 1) << 1;
   for (x = 0; x < width - 1; x += 2) {
     dst_u[x] = src_uv[0];
     dst_u[x + 1] = src_uv[-2];
     dst_v[x] = src_uv[1];
     dst_v[x + 1] = src_uv[-2 + 1];
     src_uv -= 4;
   }
   if (width & 1) {
     dst_u[width - 1] = src_uv[0];
     dst_v[width - 1] = src_uv[1];
   }
 }
 void ARGBMirrorRow_C(const uint8* src, uint8* dst, int width) {
   int x;
   const uint32* src32 = (const uint32*)(src);
   uint32* dst32 = (uint32*)(dst);
   src32 += width - 1;
   for (x = 0; x < width - 1; x += 2) {
     dst32[x] = src32[0];
     dst32[x + 1] = src32[-1];
     src32 -= 2;
   }
   if (width & 1) {
     dst32[width - 1] = src32[0];
   }
 }
 void SplitUVRow_C(const uint8* src_uv, uint8* dst_u, uint8* dst_v, int width) {
   int x;
   for (x = 0; x < width - 1; x += 2) {
     dst_u[x] = src_uv[0];
     dst_u[x + 1] = src_uv[2];
     dst_v[x] = src_uv[1];
     dst_v[x + 1] = src_uv[3];
     src_uv += 4;
   }
   if (width & 1) {
     dst_u[width - 1] = src_uv[0];
     dst_v[width - 1] = src_uv[1];
   }
 }
 void MergeUVRow_C(const uint8* src_u, const uint8* src_v, uint8* dst_uv,
                   int width) {
   int x;
   for (x = 0; x < width - 1; x += 2) {
     dst_uv[0] = src_u[x];
     dst_uv[1] = src_v[x];
     dst_uv[2] = src_u[x + 1];
     dst_uv[3] = src_v[x + 1];
     dst_uv += 4;
   }
   if (width & 1) {
     dst_uv[0] = src_u[width - 1];
     dst_uv[1] = src_v[width - 1];
   }
 }
 void CopyRow_C(const uint8* src, uint8* dst, int count) {
   memcpy(dst, src, count);
 }
 void SetRow_C(uint8* dst, uint32 v8, int count) {
 #ifdef _MSC_VER
   // VC will generate rep stosb.
   int x;
   for (x = 0; x < count; ++x) {
     dst[x] = v8;
   }
 #else
   memset(dst, v8, count);
 #endif
 }
 void ARGBSetRows_C(uint8* dst, uint32 v32, int width,
                  int dst_stride, int height) {
   int y;
   for (y = 0; y < height; ++y) {
     uint32* d = (uint32*)(dst);
     int x;
     for (x = 0; x < width; ++x) {
       d[x] = v32;
     }
     dst += dst_stride;
   }
 }
 // Filter 2 rows of YUY2 UV's (422) into U and V (420).
 void YUY2ToUVRow_C(const uint8* src_yuy2, int src_stride_yuy2,
                    uint8* dst_u, uint8* dst_v, int width) {
   // Output a row of UV values, filtering 2 rows of YUY2.
   int x;
   for (x = 0; x < width; x += 2) {
     dst_u[0] = (src_yuy2[1] + src_yuy2[src_stride_yuy2 + 1] + 1) >> 1;
     dst_v[0] = (src_yuy2[3] + src_yuy2[src_stride_yuy2 + 3] + 1) >> 1;
     src_yuy2 += 4;
     dst_u += 1;
     dst_v += 1;
   }
 }
 // Copy row of YUY2 UV's (422) into U and V (422).
 void YUY2ToUV422Row_C(const uint8* src_yuy2,
                       uint8* dst_u, uint8* dst_v, int width) {
   // Output a row of UV values.
   int x;
   for (x = 0; x < width; x += 2) {
     dst_u[0] = src_yuy2[1];
     dst_v[0] = src_yuy2[3];
     src_yuy2 += 4;
     dst_u += 1;
     dst_v += 1;
   }
 }
 // Copy row of YUY2 Y's (422) into Y (420/422).
 void YUY2ToYRow_C(const uint8* src_yuy2, uint8* dst_y, int width) {
   // Output a row of Y values.
   int x;
   for (x = 0; x < width - 1; x += 2) {
     dst_y[x] = src_yuy2[0];
     dst_y[x + 1] = src_yuy2[2];
     src_yuy2 += 4;
   }
   if (width & 1) {
     dst_y[width - 1] = src_yuy2[0];
   }
 }
 // Filter 2 rows of UYVY UV's (422) into U and V (420).
 void UYVYToUVRow_C(const uint8* src_uyvy, int src_stride_uyvy,
                    uint8* dst_u, uint8* dst_v, int width) {
   // Output a row of UV values.
   int x;
   for (x = 0; x < width; x += 2) {
     dst_u[0] = (src_uyvy[0] + src_uyvy[src_stride_uyvy + 0] + 1) >> 1;
     dst_v[0] = (src_uyvy[2] + src_uyvy[src_stride_uyvy + 2] + 1) >> 1;
     src_uyvy += 4;
     dst_u += 1;
     dst_v += 1;
   }
 }
 // Copy row of UYVY UV's (422) into U and V (422).
 void UYVYToUV422Row_C(const uint8* src_uyvy,
                       uint8* dst_u, uint8* dst_v, int width) {
   // Output a row of UV values.
   int x;
   for (x = 0; x < width; x += 2) {
     dst_u[0] = src_uyvy[0];
     dst_v[0] = src_uyvy[2];
     src_uyvy += 4;
     dst_u += 1;
     dst_v += 1;
   }
 }
 // Copy row of UYVY Y's (422) into Y (420/422).
 void UYVYToYRow_C(const uint8* src_uyvy, uint8* dst_y, int width) {
   // Output a row of Y values.
   int x;
   for (x = 0; x < width - 1; x += 2) {
     dst_y[x] = src_uyvy[1];
     dst_y[x + 1] = src_uyvy[3];
     src_uyvy += 4;
   }
   if (width & 1) {
     dst_y[width - 1] = src_uyvy[1];
   }
 }
 #define BLEND(f, b, a) (((256 - a) * b) >> 8) + f
 // Blend src_argb0 over src_argb1 and store to dst_argb.
 // dst_argb may be src_argb0 or src_argb1.
 // This code mimics the SSSE3 version for better testability.
 void ARGBBlendRow_C(const uint8* src_argb0, const uint8* src_argb1,
                     uint8* dst_argb, int width) {
   int x;
   for (x = 0; x < width - 1; x += 2) {
     uint32 fb = src_argb0[0];
     uint32 fg = src_argb0[1];
     uint32 fr = src_argb0[2];
     uint32 a = src_argb0[3];
     uint32 bb = src_argb1[0];
     uint32 bg = src_argb1[1];
     uint32 br = src_argb1[2];
     dst_argb[0] = BLEND(fb, bb, a);
     dst_argb[1] = BLEND(fg, bg, a);
     dst_argb[2] = BLEND(fr, br, a);
     dst_argb[3] = 255u;
     fb = src_argb0[4 + 0];
     fg = src_argb0[4 + 1];
     fr = src_argb0[4 + 2];
     a = src_argb0[4 + 3];
     bb = src_argb1[4 + 0];
     bg = src_argb1[4 + 1];
     br = src_argb1[4 + 2];
     dst_argb[4 + 0] = BLEND(fb, bb, a);
     dst_argb[4 + 1] = BLEND(fg, bg, a);
     dst_argb[4 + 2] = BLEND(fr, br, a);
     dst_argb[4 + 3] = 255u;
     src_argb0 += 8;
     src_argb1 += 8;
     dst_argb += 8;
   }
   if (width & 1) {
     uint32 fb = src_argb0[0];
     uint32 fg = src_argb0[1];
     uint32 fr = src_argb0[2];
     uint32 a = src_argb0[3];
     uint32 bb = src_argb1[0];
     uint32 bg = src_argb1[1];
     uint32 br = src_argb1[2];
     dst_argb[0] = BLEND(fb, bb, a);
     dst_argb[1] = BLEND(fg, bg, a);
     dst_argb[2] = BLEND(fr, br, a);
     dst_argb[3] = 255u;
   }
 }
 #undef BLEND
 #define ATTENUATE(f, a) (a | (a << 8)) * (f | (f << 8)) >> 24
 // Multiply source RGB by alpha and store to destination.
 // This code mimics the SSSE3 version for better testability.
 void ARGBAttenuateRow_C(const uint8* src_argb, uint8* dst_argb, int width) {
   int i;
   for (i = 0; i < width - 1; i += 2) {
     uint32 b = src_argb[0];
     uint32 g = src_argb[1];
     uint32 r = src_argb[2];
     uint32 a = src_argb[3];
     dst_argb[0] = ATTENUATE(b, a);
     dst_argb[1] = ATTENUATE(g, a);
     dst_argb[2] = ATTENUATE(r, a);
     dst_argb[3] = a;
     b = src_argb[4];
     g = src_argb[5];
     r = src_argb[6];
     a = src_argb[7];
     dst_argb[4] = ATTENUATE(b, a);
     dst_argb[5] = ATTENUATE(g, a);
     dst_argb[6] = ATTENUATE(r, a);
     dst_argb[7] = a;
     src_argb += 8;
     dst_argb += 8;
   }
   if (width & 1) {
     const uint32 b = src_argb[0];
     const uint32 g = src_argb[1];
     const uint32 r = src_argb[2];
     const uint32 a = src_argb[3];
     dst_argb[0] = ATTENUATE(b, a);
     dst_argb[1] = ATTENUATE(g, a);
     dst_argb[2] = ATTENUATE(r, a);
     dst_argb[3] = a;
   }
 }
 #undef ATTENUATE
 // Divide source RGB by alpha and store to destination.
 // b = (b * 255 + (a / 2)) / a;
 // g = (g * 255 + (a / 2)) / a;
 // r = (r * 255 + (a / 2)) / a;
 // Reciprocal method is off by 1 on some values. ie 125
 // 8.8 fixed point inverse table with 1.0 in upper short and 1 / a in lower.
 #define T(a) 0x01000000 + (0x10000 / a)
 const uint32 fixed_invtbl8[256] = {
 x01000000, 0x0100ffff, T(0x02), T(0x03), T(0x04), T(0x05), T(0x06), T(0x07),
   T(0x08), T(0x09), T(0x0a), T(0x0b), T(0x0c), T(0x0d), T(0x0e), T(0x0f),
   T(0x10), T(0x11), T(0x12), T(0x13), T(0x14), T(0x15), T(0x16), T(0x17),
   T(0x18), T(0x19), T(0x1a), T(0x1b), T(0x1c), T(0x1d), T(0x1e), T(0x1f),
   T(0x20), T(0x21), T(0x22), T(0x23), T(0x24), T(0x25), T(0x26), T(0x27),
   T(0x28), T(0x29), T(0x2a), T(0x2b), T(0x2c), T(0x2d), T(0x2e), T(0x2f),
   T(0x30), T(0x31), T(0x32), T(0x33), T(0x34), T(0x35), T(0x36), T(0x37),
   T(0x38), T(0x39), T(0x3a), T(0x3b), T(0x3c), T(0x3d), T(0x3e), T(0x3f),
   T(0x40), T(0x41), T(0x42), T(0x43), T(0x44), T(0x45), T(0x46), T(0x47),
   T(0x48), T(0x49), T(0x4a), T(0x4b), T(0x4c), T(0x4d), T(0x4e), T(0x4f),
   T(0x50), T(0x51), T(0x52), T(0x53), T(0x54), T(0x55), T(0x56), T(0x57),
   T(0x58), T(0x59), T(0x5a), T(0x5b), T(0x5c), T(0x5d), T(0x5e), T(0x5f),
   T(0x60), T(0x61), T(0x62), T(0x63), T(0x64), T(0x65), T(0x66), T(0x67),
   T(0x68), T(0x69), T(0x6a), T(0x6b), T(0x6c), T(0x6d), T(0x6e), T(0x6f),
   T(0x70), T(0x71), T(0x72), T(0x73), T(0x74), T(0x75), T(0x76), T(0x77),
   T(0x78), T(0x79), T(0x7a), T(0x7b), T(0x7c), T(0x7d), T(0x7e), T(0x7f),
   T(0x80), T(0x81), T(0x82), T(0x83), T(0x84), T(0x85), T(0x86), T(0x87),
   T(0x88), T(0x89), T(0x8a), T(0x8b), T(0x8c), T(0x8d), T(0x8e), T(0x8f),
   T(0x90), T(0x91), T(0x92), T(0x93), T(0x94), T(0x95), T(0x96), T(0x97),
   T(0x98), T(0x99), T(0x9a), T(0x9b), T(0x9c), T(0x9d), T(0x9e), T(0x9f),
   T(0xa0), T(0xa1), T(0xa2), T(0xa3), T(0xa4), T(0xa5), T(0xa6), T(0xa7),
   T(0xa8), T(0xa9), T(0xaa), T(0xab), T(0xac), T(0xad), T(0xae), T(0xaf),
   T(0xb0), T(0xb1), T(0xb2), T(0xb3), T(0xb4), T(0xb5), T(0xb6), T(0xb7),
   T(0xb8), T(0xb9), T(0xba), T(0xbb), T(0xbc), T(0xbd), T(0xbe), T(0xbf),
   T(0xc0), T(0xc1), T(0xc2), T(0xc3), T(0xc4), T(0xc5), T(0xc6), T(0xc7),
   T(0xc8), T(0xc9), T(0xca), T(0xcb), T(0xcc), T(0xcd), T(0xce), T(0xcf),
   T(0xd0), T(0xd1), T(0xd2), T(0xd3), T(0xd4), T(0xd5), T(0xd6), T(0xd7),
   T(0xd8), T(0xd9), T(0xda), T(0xdb), T(0xdc), T(0xdd), T(0xde), T(0xdf),
   T(0xe0), T(0xe1), T(0xe2), T(0xe3), T(0xe4), T(0xe5), T(0xe6), T(0xe7),
   T(0xe8), T(0xe9), T(0xea), T(0xeb), T(0xec), T(0xed), T(0xee), T(0xef),
   T(0xf0), T(0xf1), T(0xf2), T(0xf3), T(0xf4), T(0xf5), T(0xf6), T(0xf7),
   T(0xf8), T(0xf9), T(0xfa), T(0xfb), T(0xfc), T(0xfd), T(0xfe), 0x01000100 };
 #undef T
 void ARGBUnattenuateRow_C(const uint8* src_argb, uint8* dst_argb, int width) {
   int i;
   for (i = 0; i < width; ++i) {
     uint32 b = src_argb[0];
     uint32 g = src_argb[1];
     uint32 r = src_argb[2];
     const uint32 a = src_argb[3];
     const uint32 ia = fixed_invtbl8[a] & 0xffff;  // 8.8 fixed point
     b = (b * ia) >> 8;
     g = (g * ia) >> 8;
     r = (r * ia) >> 8;
     // Clamping should not be necessary but is free in assembly.
     dst_argb[0] = clamp255(b);
     dst_argb[1] = clamp255(g);
     dst_argb[2] = clamp255(r);
     dst_argb[3] = a;
     src_argb += 4;
     dst_argb += 4;
   }
 }
 void ComputeCumulativeSumRow_C(const uint8* row, int32* cumsum,
                                const int32* previous_cumsum, int width) {
   int32 row_sum[4] = {0, 0, 0, 0};
   int x;
   for (x = 0; x < width; ++x) {
     row_sum[0] += row[x * 4 + 0];
     row_sum[1] += row[x * 4 + 1];
     row_sum[2] += row[x * 4 + 2];
     row_sum[3] += row[x * 4 + 3];
     cumsum[x * 4 + 0] = row_sum[0]  + previous_cumsum[x * 4 + 0];
     cumsum[x * 4 + 1] = row_sum[1]  + previous_cumsum[x * 4 + 1];
     cumsum[x * 4 + 2] = row_sum[2]  + previous_cumsum[x * 4 + 2];
     cumsum[x * 4 + 3] = row_sum[3]  + previous_cumsum[x * 4 + 3];
   }
 }
 void CumulativeSumToAverageRow_C(const int32* tl, const int32* bl,
                                 int w, int area, uint8* dst, int count) {
   float ooa = 1.0f / area;
   int i;
   for (i = 0; i < count; ++i) {
     dst[0] = (uint8)((bl[w + 0] + tl[0] - bl[0] - tl[w + 0]) * ooa);
     dst[1] = (uint8)((bl[w + 1] + tl[1] - bl[1] - tl[w + 1]) * ooa);
     dst[2] = (uint8)((bl[w + 2] + tl[2] - bl[2] - tl[w + 2]) * ooa);
     dst[3] = (uint8)((bl[w + 3] + tl[3] - bl[3] - tl[w + 3]) * ooa);
     dst += 4;
     tl += 4;
     bl += 4;
   }
 }
 // Copy pixels from rotated source to destination row with a slope.
 LIBYUV_API
 void ARGBAffineRow_C(const uint8* src_argb, int src_argb_stride,
                      uint8* dst_argb, const float* uv_dudv, int width) {
   int i;
   // Render a row of pixels from source into a buffer.
   float uv[2];
   uv[0] = uv_dudv[0];
   uv[1] = uv_dudv[1];
   for (i = 0; i < width; ++i) {
     int x = (int)(uv[0]);
     int y = (int)(uv[1]);
     *(uint32*)(dst_argb) =
         *(const uint32*)(src_argb + y * src_argb_stride +
                                          x * 4);
     dst_argb += 4;
     uv[0] += uv_dudv[2];
     uv[1] += uv_dudv[3];
   }
 }
 // Blend 2 rows into 1 for conversions such as I422ToI420.
 void HalfRow_C(const uint8* src_uv, int src_uv_stride,
                uint8* dst_uv, int pix) {
   int x;
   for (x = 0; x < pix; ++x) {
     dst_uv[x] = (src_uv[x] + src_uv[src_uv_stride + x] + 1) >> 1;
   }
 }
 // C version 2x2 -> 2x1.
 void InterpolateRow_C(uint8* dst_ptr, const uint8* src_ptr,
                       ptrdiff_t src_stride,
                       int width, int source_y_fraction) {
   int y1_fraction = source_y_fraction;
   int y0_fraction = 256 - y1_fraction;
   const uint8* src_ptr1 = src_ptr + src_stride;
   int x;
   if (source_y_fraction == 0) {
     memcpy(dst_ptr, src_ptr, width);
     return;
   }
   if (source_y_fraction == 128) {
     HalfRow_C(src_ptr, (int)(src_stride), dst_ptr, width);
     return;
   }
   for (x = 0; x < width - 1; x += 2) {
     dst_ptr[0] = (src_ptr[0] * y0_fraction + src_ptr1[0] * y1_fraction) >> 8;
     dst_ptr[1] = (src_ptr[1] * y0_fraction + src_ptr1[1] * y1_fraction) >> 8;
     src_ptr += 2;
     src_ptr1 += 2;
     dst_ptr += 2;
   }
   if (width & 1) {
     dst_ptr[0] = (src_ptr[0] * y0_fraction + src_ptr1[0] * y1_fraction) >> 8;
   }
 }
 // Select 2 channels from ARGB on alternating pixels.  e.g.  BGBGBGBG
 void ARGBToBayerRow_C(const uint8* src_argb,
                       uint8* dst_bayer, uint32 selector, int pix) {
   int index0 = selector & 0xff;
   int index1 = (selector >> 8) & 0xff;
   // Copy a row of Bayer.
   int x;
   for (x = 0; x < pix - 1; x += 2) {
     dst_bayer[0] = src_argb[index0];
     dst_bayer[1] = src_argb[index1];
     src_argb += 8;
     dst_bayer += 2;
   }
   if (pix & 1) {
     dst_bayer[0] = src_argb[index0];
   }
 }
 // Select G channel from ARGB.  e.g.  GGGGGGGG
 void ARGBToBayerGGRow_C(const uint8* src_argb,
                         uint8* dst_bayer, uint32 selector, int pix) {
   // Copy a row of G.
   int x;
   for (x = 0; x < pix - 1; x += 2) {
     dst_bayer[0] = src_argb[1];
     dst_bayer[1] = src_argb[5];
     src_argb += 8;
     dst_bayer += 2;
   }
   if (pix & 1) {
     dst_bayer[0] = src_argb[1];
   }
 }
 // Use first 4 shuffler values to reorder ARGB channels.
 void ARGBShuffleRow_C(const uint8* src_argb, uint8* dst_argb,
                       const uint8* shuffler, int pix) {
   int index0 = shuffler[0];
   int index1 = shuffler[1];
   int index2 = shuffler[2];
   int index3 = shuffler[3];
   // Shuffle a row of ARGB.
   int x;
   for (x = 0; x < pix; ++x) {
     // To support in-place conversion.
     uint8 b = src_argb[index0];
     uint8 g = src_argb[index1];
     uint8 r = src_argb[index2];
     uint8 a = src_argb[index3];
     dst_argb[0] = b;
     dst_argb[1] = g;
     dst_argb[2] = r;
     dst_argb[3] = a;
     src_argb += 4;
     dst_argb += 4;
   }
 }
 void I422ToYUY2Row_C(const uint8* src_y,
                      const uint8* src_u,
                      const uint8* src_v,
                      uint8* dst_frame, int width) {
   int x;
   for (x = 0; x < width - 1; x += 2) {
     dst_frame[0] = src_y[0];
     dst_frame[1] = src_u[0];
     dst_frame[2] = src_y[1];
     dst_frame[3] = src_v[0];
     dst_frame += 4;
     src_y += 2;
     src_u += 1;
     src_v += 1;
   }
   if (width & 1) {
     dst_frame[0] = src_y[0];
     dst_frame[1] = src_u[0];
     dst_frame[2] = src_y[0];  // duplicate last y
     dst_frame[3] = src_v[0];
   }
 }
 void I422ToUYVYRow_C(const uint8* src_y,
                      const uint8* src_u,
                      const uint8* src_v,
                      uint8* dst_frame, int width) {
   int x;
   for (x = 0; x < width - 1; x += 2) {
     dst_frame[0] = src_u[0];
     dst_frame[1] = src_y[0];
     dst_frame[2] = src_v[0];
     dst_frame[3] = src_y[1];
     dst_frame += 4;
     src_y += 2;
     src_u += 1;
     src_v += 1;
   }
   if (width & 1) {
     dst_frame[0] = src_u[0];
     dst_frame[1] = src_y[0];
     dst_frame[2] = src_v[0];
     dst_frame[3] = src_y[0];  // duplicate last y
   }
 }
 #if !defined(LIBYUV_DISABLE_X86) && defined(HAS_I422TOARGBROW_SSSE3)
 // row_win.cc has asm version, but GCC uses 2 step wrapper.
 #if defined(__x86_64__) || defined(__i386__)
 void I422ToRGB565Row_SSSE3(const uint8* src_y,
                            const uint8* src_u,
                            const uint8* src_v,
                            uint8* rgb_buf,
                            int width) {
   // Allocate a row of ARGB.
   align_buffer_64(row, width * 4);
   I422ToARGBRow_SSSE3(src_y, src_u, src_v, row, width);
   ARGBToRGB565Row_SSE2(row, rgb_buf, width);
   free_aligned_buffer_64(row);
 }
 #endif  // defined(__x86_64__) || defined(__i386__)
 #if defined(_M_IX86) || defined(__x86_64__) || defined(__i386__)
 void I422ToARGB1555Row_SSSE3(const uint8* src_y,
                              const uint8* src_u,
                              const uint8* src_v,
                              uint8* rgb_buf,
                              int width) {
   // Allocate a row of ARGB.
   align_buffer_64(row, width * 4);
   I422ToARGBRow_SSSE3(src_y, src_u, src_v, row, width);
   ARGBToARGB1555Row_SSE2(row, rgb_buf, width);
   free_aligned_buffer_64(row);
 }
 void I422ToARGB4444Row_SSSE3(const uint8* src_y,
                              const uint8* src_u,
                              const uint8* src_v,
                              uint8* rgb_buf,
                              int width) {
   // Allocate a row of ARGB.
   align_buffer_64(row, width * 4);
   I422ToARGBRow_SSSE3(src_y, src_u, src_v, row, width);
   ARGBToARGB4444Row_SSE2(row, rgb_buf, width);
   free_aligned_buffer_64(row);
 }
 void NV12ToRGB565Row_SSSE3(const uint8* src_y,
                            const uint8* src_uv,
                            uint8* dst_rgb565,
                            int width) {
   // Allocate a row of ARGB.
   align_buffer_64(row, width * 4);
   NV12ToARGBRow_SSSE3(src_y, src_uv, row, width);
   ARGBToRGB565Row_SSE2(row, dst_rgb565, width);
   free_aligned_buffer_64(row);
 }
 void NV21ToRGB565Row_SSSE3(const uint8* src_y,
                            const uint8* src_vu,
                            uint8* dst_rgb565,
                            int width) {
   // Allocate a row of ARGB.
   align_buffer_64(row, width * 4);
   NV21ToARGBRow_SSSE3(src_y, src_vu, row, width);
   ARGBToRGB565Row_SSE2(row, dst_rgb565, width);
   free_aligned_buffer_64(row);
 }
 void YUY2ToARGBRow_SSSE3(const uint8* src_yuy2,
                          uint8* dst_argb,
                          int width) {
   // Allocate a rows of yuv.
   align_buffer_64(row_y, ((width + 63) & ~63) * 2);
   uint8* row_u = row_y + ((width + 63) & ~63);
   uint8* row_v = row_u + ((width + 63) & ~63) / 2;
   YUY2ToUV422Row_SSE2(src_yuy2, row_u, row_v, width);
   YUY2ToYRow_SSE2(src_yuy2, row_y, width);
   I422ToARGBRow_SSSE3(row_y, row_u, row_v, dst_argb, width);
   free_aligned_buffer_64(row_y);
 }
 void YUY2ToARGBRow_Unaligned_SSSE3(const uint8* src_yuy2,
                                    uint8* dst_argb,
                                    int width) {
   // Allocate a rows of yuv.
   align_buffer_64(row_y, ((width + 63) & ~63) * 2);
   uint8* row_u = row_y + ((width + 63) & ~63);
   uint8* row_v = row_u + ((width + 63) & ~63) / 2;
   YUY2ToUV422Row_Unaligned_SSE2(src_yuy2, row_u, row_v, width);
   YUY2ToYRow_Unaligned_SSE2(src_yuy2, row_y, width);
   I422ToARGBRow_Unaligned_SSSE3(row_y, row_u, row_v, dst_argb, width);
   free_aligned_buffer_64(row_y);
 }
 void UYVYToARGBRow_SSSE3(const uint8* src_uyvy,
                          uint8* dst_argb,
                          int width) {
   // Allocate a rows of yuv.
   align_buffer_64(row_y, ((width + 63) & ~63) * 2);
   uint8* row_u = row_y + ((width + 63) & ~63);
   uint8* row_v = row_u + ((width + 63) & ~63) / 2;
   UYVYToUV422Row_SSE2(src_uyvy, row_u, row_v, width);
   UYVYToYRow_SSE2(src_uyvy, row_y, width);
   I422ToARGBRow_SSSE3(row_y, row_u, row_v, dst_argb, width);
   free_aligned_buffer_64(row_y);
 }
 void UYVYToARGBRow_Unaligned_SSSE3(const uint8* src_uyvy,
                                    uint8* dst_argb,
                                    int width) {
   // Allocate a rows of yuv.
   align_buffer_64(row_y, ((width + 63) & ~63) * 2);
   uint8* row_u = row_y + ((width + 63) & ~63);
   uint8* row_v = row_u + ((width + 63) & ~63) / 2;
   UYVYToUV422Row_Unaligned_SSE2(src_uyvy, row_u, row_v, width);
   UYVYToYRow_Unaligned_SSE2(src_uyvy, row_y, width);
   I422ToARGBRow_Unaligned_SSSE3(row_y, row_u, row_v, dst_argb, width);
   free_aligned_buffer_64(row_y);
 }
 #endif  // defined(_M_IX86) || defined(__x86_64__) || defined(__i386__)
 #endif  // !defined(LIBYUV_DISABLE_X86)
 void ARGBPolynomialRow_C(const uint8* src_argb,
                          uint8* dst_argb, const float* poly,
                          int width) {
   int i;
   for (i = 0; i < width; ++i) {
     float b = (float)(src_argb[0]);
     float g = (float)(src_argb[1]);
     float r = (float)(src_argb[2]);
     float a = (float)(src_argb[3]);
     float b2 = b * b;
     float g2 = g * g;
     float r2 = r * r;
     float a2 = a * a;
     float db = poly[0] + poly[4] * b;
     float dg = poly[1] + poly[5] * g;
     float dr = poly[2] + poly[6] * r;
     float da = poly[3] + poly[7] * a;
     float b3 = b2 * b;
     float g3 = g2 * g;
     float r3 = r2 * r;
     float a3 = a2 * a;
     db += poly[8] * b2;
     dg += poly[9] * g2;
     dr += poly[10] * r2;
     da += poly[11] * a2;
     db += poly[12] * b3;
     dg += poly[13] * g3;
     dr += poly[14] * r3;
     da += poly[15] * a3;
     dst_argb[0] = Clamp((int32)(db));
     dst_argb[1] = Clamp((int32)(dg));
     dst_argb[2] = Clamp((int32)(dr));
     dst_argb[3] = Clamp((int32)(da));
     src_argb += 4;
     dst_argb += 4;
   }
 }
 void ARGBLumaColorTableRow_C(const uint8* src_argb, uint8* dst_argb, int width,
                              const uint8* luma, uint32 lumacoeff) {
   uint32 bc = lumacoeff & 0xff;
   uint32 gc = (lumacoeff >> 8) & 0xff;
   uint32 rc = (lumacoeff >> 16) & 0xff;
   int i;
   for (i = 0; i < width - 1; i += 2) {
     // Luminance in rows, color values in columns.
     const uint8* luma0 = ((src_argb[0] * bc + src_argb[1] * gc +
                            src_argb[2] * rc) & 0x7F00u) + luma;
     const uint8* luma1;
     dst_argb[0] = luma0[src_argb[0]];
     dst_argb[1] = luma0[src_argb[1]];
     dst_argb[2] = luma0[src_argb[2]];
     dst_argb[3] = src_argb[3];
     luma1 = ((src_argb[4] * bc + src_argb[5] * gc +
               src_argb[6] * rc) & 0x7F00u) + luma;
     dst_argb[4] = luma1[src_argb[4]];
     dst_argb[5] = luma1[src_argb[5]];
     dst_argb[6] = luma1[src_argb[6]];
     dst_argb[7] = src_argb[7];
     src_argb += 8;
     dst_argb += 8;
   }
   if (width & 1) {
     // Luminance in rows, color values in columns.
     const uint8* luma0 = ((src_argb[0] * bc + src_argb[1] * gc +
                            src_argb[2] * rc) & 0x7F00u) + luma;
     dst_argb[0] = luma0[src_argb[0]];
     dst_argb[1] = luma0[src_argb[1]];
     dst_argb[2] = luma0[src_argb[2]];
     dst_argb[3] = src_argb[3];
   }
 }
 void ARGBCopyAlphaRow_C(const uint8* src, uint8* dst, int width) {
   int i;
   for (i = 0; i < width - 1; i += 2) {
     dst[3] = src[3];
     dst[7] = src[7];
     dst += 8;
     src += 8;
   }
   if (width & 1) {
     dst[3] = src[3];
   }
 }
 void ARGBCopyYToAlphaRow_C(const uint8* src, uint8* dst, int width) {
   int i;
   for (i = 0; i < width - 1; i += 2) {
     dst[3] = src[0];
     dst[7] = src[1];
     dst += 8;
     src += 2;
   }
   if (width & 1) {
     dst[3] = src[0];
   }
 }
 #ifdef __cplusplus
 }  // extern "C"
 }  // namespace libyuv
 #endif

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media/libyuv/source/row_common.cc