webp/src/dsp/yuv_sse2.c - nest-cam/4320010/webp - Git at Google

 // Copyright 2014 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.
 // -----------------------------------------------------------------------------
 //
 // YUV->RGB conversion functions
 //
 // Author: Skal (pascal.massimino@gmail.com)

 #include "./yuv.h"

 #if defined(WEBP_USE_SSE2)

 #include <emmintrin.h>
 #include <string.h>   // for memcpy

 typedef union {   // handy struct for converting SSE2 registers
   int32_t i32[4];
   uint8_t u8[16];
   __m128i m;
 } VP8kCstSSE2;

 #if defined(WEBP_YUV_USE_SSE2_TABLES)

 #include "./yuv_tables_sse2.h"

 void VP8YUVInitSSE2(void) {}

 #else

 static int done_sse2 = 0;
 static VP8kCstSSE2 VP8kUtoRGBA[256], VP8kVtoRGBA[256], VP8kYtoRGBA[256];

 void VP8YUVInitSSE2(void) {
   if (!done_sse2) {
     int i;
     for (i = 0; i < 256; ++i) {
       VP8kYtoRGBA[i].i32[0] =
         VP8kYtoRGBA[i].i32[1] =
         VP8kYtoRGBA[i].i32[2] = (i - 16) * kYScale + YUV_HALF2;
       VP8kYtoRGBA[i].i32[3] = 0xff << YUV_FIX2;

       VP8kUtoRGBA[i].i32[0] = 0;
       VP8kUtoRGBA[i].i32[1] = -kUToG * (i - 128);
       VP8kUtoRGBA[i].i32[2] =  kUToB * (i - 128);
       VP8kUtoRGBA[i].i32[3] = 0;

       VP8kVtoRGBA[i].i32[0] =  kVToR * (i - 128);
       VP8kVtoRGBA[i].i32[1] = -kVToG * (i - 128);
       VP8kVtoRGBA[i].i32[2] = 0;
       VP8kVtoRGBA[i].i32[3] = 0;
     }
     done_sse2 = 1;

 #if 0   // code used to generate 'yuv_tables_sse2.h'
     printf("static const VP8kCstSSE2 VP8kYtoRGBA[256] = {\n");
     for (i = 0; i < 256; ++i) {
       printf("  {{0x%.8x, 0x%.8x, 0x%.8x, 0x%.8x}},\n",
              VP8kYtoRGBA[i].i32[0], VP8kYtoRGBA[i].i32[1],
              VP8kYtoRGBA[i].i32[2], VP8kYtoRGBA[i].i32[3]);
     }
     printf("};\n\n");
     printf("static const VP8kCstSSE2 VP8kUtoRGBA[256] = {\n");
     for (i = 0; i < 256; ++i) {
       printf("  {{0, 0x%.8x, 0x%.8x, 0}},\n",
              VP8kUtoRGBA[i].i32[1], VP8kUtoRGBA[i].i32[2]);
     }
     printf("};\n\n");
     printf("static VP8kCstSSE2 VP8kVtoRGBA[256] = {\n");
     for (i = 0; i < 256; ++i) {
       printf("  {{0x%.8x, 0x%.8x, 0, 0}},\n",
              VP8kVtoRGBA[i].i32[0], VP8kVtoRGBA[i].i32[1]);
     }
     printf("};\n\n");
 #endif
   }
 }

 #endif  // WEBP_YUV_USE_SSE2_TABLES

 //-----------------------------------------------------------------------------

 static WEBP_INLINE __m128i LoadUVPart(int u, int v) {
   const __m128i u_part = _mm_loadu_si128(&VP8kUtoRGBA[u].m);
   const __m128i v_part = _mm_loadu_si128(&VP8kVtoRGBA[v].m);
   const __m128i uv_part = _mm_add_epi32(u_part, v_part);
   return uv_part;
 }

 static WEBP_INLINE __m128i GetRGBA32bWithUV(int y, const __m128i uv_part) {
   const __m128i y_part = _mm_loadu_si128(&VP8kYtoRGBA[y].m);
   const __m128i rgba1 = _mm_add_epi32(y_part, uv_part);
   const __m128i rgba2 = _mm_srai_epi32(rgba1, YUV_FIX2);
   return rgba2;
 }

 static WEBP_INLINE __m128i GetRGBA32b(int y, int u, int v) {
   const __m128i uv_part = LoadUVPart(u, v);
   return GetRGBA32bWithUV(y, uv_part);
 }

 static WEBP_INLINE void YuvToRgbSSE2(uint8_t y, uint8_t u, uint8_t v,
                                      uint8_t* const rgb) {
   const __m128i tmp0 = GetRGBA32b(y, u, v);
   const __m128i tmp1 = _mm_packs_epi32(tmp0, tmp0);
   const __m128i tmp2 = _mm_packus_epi16(tmp1, tmp1);
   // Note: we store 8 bytes at a time, not 3 bytes! -> memory stomp
   _mm_storel_epi64((__m128i*)rgb, tmp2);
 }

 static WEBP_INLINE void YuvToBgrSSE2(uint8_t y, uint8_t u, uint8_t v,
                                      uint8_t* const bgr) {
   const __m128i tmp0 = GetRGBA32b(y, u, v);
   const __m128i tmp1 = _mm_shuffle_epi32(tmp0, _MM_SHUFFLE(3, 0, 1, 2));
   const __m128i tmp2 = _mm_packs_epi32(tmp1, tmp1);
   const __m128i tmp3 = _mm_packus_epi16(tmp2, tmp2);
   // Note: we store 8 bytes at a time, not 3 bytes! -> memory stomp
   _mm_storel_epi64((__m128i*)bgr, tmp3);
 }

 //-----------------------------------------------------------------------------
 // Convert spans of 32 pixels to various RGB formats for the fancy upsampler.

 #ifdef FANCY_UPSAMPLING

 void VP8YuvToRgba32(const uint8_t* y, const uint8_t* u, const uint8_t* v,
                     uint8_t* dst) {
   int n;
   for (n = 0; n < 32; n += 4) {
     const __m128i tmp0_1 = GetRGBA32b(y[n + 0], u[n + 0], v[n + 0]);
     const __m128i tmp0_2 = GetRGBA32b(y[n + 1], u[n + 1], v[n + 1]);
     const __m128i tmp0_3 = GetRGBA32b(y[n + 2], u[n + 2], v[n + 2]);
     const __m128i tmp0_4 = GetRGBA32b(y[n + 3], u[n + 3], v[n + 3]);
     const __m128i tmp1_1 = _mm_packs_epi32(tmp0_1, tmp0_2);
     const __m128i tmp1_2 = _mm_packs_epi32(tmp0_3, tmp0_4);
     const __m128i tmp2 = _mm_packus_epi16(tmp1_1, tmp1_2);
     _mm_storeu_si128((__m128i*)dst, tmp2);
     dst += 4 * 4;
   }
 }

 void VP8YuvToBgra32(const uint8_t* y, const uint8_t* u, const uint8_t* v,
                     uint8_t* dst) {
   int n;
   for (n = 0; n < 32; n += 2) {
     const __m128i tmp0_1 = GetRGBA32b(y[n + 0], u[n + 0], v[n + 0]);
     const __m128i tmp0_2 = GetRGBA32b(y[n + 1], u[n + 1], v[n + 1]);
     const __m128i tmp1_1 = _mm_shuffle_epi32(tmp0_1, _MM_SHUFFLE(3, 0, 1, 2));
     const __m128i tmp1_2 = _mm_shuffle_epi32(tmp0_2, _MM_SHUFFLE(3, 0, 1, 2));
     const __m128i tmp2_1 = _mm_packs_epi32(tmp1_1, tmp1_2);
     const __m128i tmp3 = _mm_packus_epi16(tmp2_1, tmp2_1);
     _mm_storel_epi64((__m128i*)dst, tmp3);
     dst += 4 * 2;
   }
 }

 void VP8YuvToRgb32(const uint8_t* y, const uint8_t* u, const uint8_t* v,
                    uint8_t* dst) {
   int n;
   uint8_t tmp0[2 * 3 + 5 + 15];
   uint8_t* const tmp = (uint8_t*)((uintptr_t)(tmp0 + 15) & ~15);  // align
   for (n = 0; n < 30; ++n) {   // we directly stomp the *dst memory
     YuvToRgbSSE2(y[n], u[n], v[n], dst + n * 3);
   }
   // Last two pixels are special: we write in a tmp buffer before sending
   // to dst.
   YuvToRgbSSE2(y[n + 0], u[n + 0], v[n + 0], tmp + 0);
   YuvToRgbSSE2(y[n + 1], u[n + 1], v[n + 1], tmp + 3);
   memcpy(dst + n * 3, tmp, 2 * 3);
 }

 void VP8YuvToBgr32(const uint8_t* y, const uint8_t* u, const uint8_t* v,
                    uint8_t* dst) {
   int n;
   uint8_t tmp0[2 * 3 + 5 + 15];
   uint8_t* const tmp = (uint8_t*)((uintptr_t)(tmp0 + 15) & ~15);  // align
   for (n = 0; n < 30; ++n) {
     YuvToBgrSSE2(y[n], u[n], v[n], dst + n * 3);
   }
   YuvToBgrSSE2(y[n + 0], u[n + 0], v[n + 0], tmp + 0);
   YuvToBgrSSE2(y[n + 1], u[n + 1], v[n + 1], tmp + 3);
   memcpy(dst + n * 3, tmp, 2 * 3);
 }

 #endif  // FANCY_UPSAMPLING

 //-----------------------------------------------------------------------------
 // Arbitrary-length row conversion functions

 static void YuvToRgbaRowSSE2(const uint8_t* y,
                              const uint8_t* u, const uint8_t* v,
                              uint8_t* dst, int len) {
   int n;
   for (n = 0; n + 4 <= len; n += 4) {
     const __m128i uv_0 = LoadUVPart(u[0], v[0]);
     const __m128i uv_1 = LoadUVPart(u[1], v[1]);
     const __m128i tmp0_1 = GetRGBA32bWithUV(y[0], uv_0);
     const __m128i tmp0_2 = GetRGBA32bWithUV(y[1], uv_0);
     const __m128i tmp0_3 = GetRGBA32bWithUV(y[2], uv_1);
     const __m128i tmp0_4 = GetRGBA32bWithUV(y[3], uv_1);
     const __m128i tmp1_1 = _mm_packs_epi32(tmp0_1, tmp0_2);
     const __m128i tmp1_2 = _mm_packs_epi32(tmp0_3, tmp0_4);
     const __m128i tmp2 = _mm_packus_epi16(tmp1_1, tmp1_2);
     _mm_storeu_si128((__m128i*)dst, tmp2);
     dst += 4 * 4;
     y += 4;
     u += 2;
     v += 2;
   }
   // Finish off
   while (n < len) {
     VP8YuvToRgba(y[0], u[0], v[0], dst);
     dst += 4;
     ++y;
     u += (n & 1);
     v += (n & 1);
     ++n;
   }
 }

 static void YuvToBgraRowSSE2(const uint8_t* y,
                              const uint8_t* u, const uint8_t* v,
                              uint8_t* dst, int len) {
   int n;
   for (n = 0; n + 2 <= len; n += 2) {
     const __m128i uv_0 = LoadUVPart(u[0], v[0]);
     const __m128i tmp0_1 = GetRGBA32bWithUV(y[0], uv_0);
     const __m128i tmp0_2 = GetRGBA32bWithUV(y[1], uv_0);
     const __m128i tmp1_1 = _mm_shuffle_epi32(tmp0_1, _MM_SHUFFLE(3, 0, 1, 2));
     const __m128i tmp1_2 = _mm_shuffle_epi32(tmp0_2, _MM_SHUFFLE(3, 0, 1, 2));
     const __m128i tmp2_1 = _mm_packs_epi32(tmp1_1, tmp1_2);
     const __m128i tmp3 = _mm_packus_epi16(tmp2_1, tmp2_1);
     _mm_storel_epi64((__m128i*)dst, tmp3);
     dst += 4 * 2;
     y += 2;
     ++u;
     ++v;
   }
   // Finish off
   if (len & 1) {
     VP8YuvToBgra(y[0], u[0], v[0], dst);
   }
 }

 static void YuvToArgbRowSSE2(const uint8_t* y,
                              const uint8_t* u, const uint8_t* v,
                              uint8_t* dst, int len) {
   int n;
   for (n = 0; n + 2 <= len; n += 2) {
     const __m128i uv_0 = LoadUVPart(u[0], v[0]);
     const __m128i tmp0_1 = GetRGBA32bWithUV(y[0], uv_0);
     const __m128i tmp0_2 = GetRGBA32bWithUV(y[1], uv_0);
     const __m128i tmp1_1 = _mm_shuffle_epi32(tmp0_1, _MM_SHUFFLE(2, 1, 0, 3));
     const __m128i tmp1_2 = _mm_shuffle_epi32(tmp0_2, _MM_SHUFFLE(2, 1, 0, 3));
     const __m128i tmp2_1 = _mm_packs_epi32(tmp1_1, tmp1_2);
     const __m128i tmp3 = _mm_packus_epi16(tmp2_1, tmp2_1);
     _mm_storel_epi64((__m128i*)dst, tmp3);
     dst += 4 * 2;
     y += 2;
     ++u;
     ++v;
   }
   // Finish off
   if (len & 1) {
     VP8YuvToArgb(y[0], u[0], v[0], dst);
   }
 }

 static void YuvToRgbRowSSE2(const uint8_t* y,
                             const uint8_t* u, const uint8_t* v,
                             uint8_t* dst, int len) {
   int n;
   for (n = 0; n + 2 < len; ++n) {   // we directly stomp the *dst memory
     YuvToRgbSSE2(y[0], u[0], v[0], dst);  // stomps 8 bytes
     dst += 3;
     ++y;
     u += (n & 1);
     v += (n & 1);
   }
   VP8YuvToRgb(y[0], u[0], v[0], dst);
   if (len > 1) {
     VP8YuvToRgb(y[1], u[n & 1], v[n & 1], dst + 3);
   }
 }

 static void YuvToBgrRowSSE2(const uint8_t* y,
                             const uint8_t* u, const uint8_t* v,
                             uint8_t* dst, int len) {
   int n;
   for (n = 0; n + 2 < len; ++n) {   // we directly stomp the *dst memory
     YuvToBgrSSE2(y[0], u[0], v[0], dst);  // stomps 8 bytes
     dst += 3;
     ++y;
     u += (n & 1);
     v += (n & 1);
   }
   VP8YuvToBgr(y[0], u[0], v[0], dst + 0);
   if (len > 1) {
     VP8YuvToBgr(y[1], u[n & 1], v[n & 1], dst + 3);
   }
 }

 #endif  // WEBP_USE_SSE2

 //------------------------------------------------------------------------------
 // Entry point

 extern void WebPInitSamplersSSE2(void);

 void WebPInitSamplersSSE2(void) {
 #if defined(WEBP_USE_SSE2)
   WebPSamplers[MODE_RGB]  = YuvToRgbRowSSE2;
   WebPSamplers[MODE_RGBA] = YuvToRgbaRowSSE2;
   WebPSamplers[MODE_BGR]  = YuvToBgrRowSSE2;
   WebPSamplers[MODE_BGRA] = YuvToBgraRowSSE2;
   WebPSamplers[MODE_ARGB] = YuvToArgbRowSSE2;
 #endif  // WEBP_USE_SSE2
 }
	// Copyright 2014 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.
	// -----------------------------------------------------------------------------
	//
	// YUV->RGB conversion functions
	//
	// Author: Skal (pascal.massimino@gmail.com)

	#include "./yuv.h"

	#if defined(WEBP_USE_SSE2)

	#include <emmintrin.h>
	#include <string.h> // for memcpy

	typedef union { // handy struct for converting SSE2 registers
	int32_t i32[4];
	uint8_t u8[16];
	__m128i m;
	} VP8kCstSSE2;

	#if defined(WEBP_YUV_USE_SSE2_TABLES)

	#include "./yuv_tables_sse2.h"

	void VP8YUVInitSSE2(void) {}

	#else

	static int done_sse2 = 0;
	static VP8kCstSSE2 VP8kUtoRGBA[256], VP8kVtoRGBA[256], VP8kYtoRGBA[256];

	void VP8YUVInitSSE2(void) {
	if (!done_sse2) {
	int i;
	for (i = 0; i < 256; ++i) {
	VP8kYtoRGBA[i].i32[0] =
	VP8kYtoRGBA[i].i32[1] =
	VP8kYtoRGBA[i].i32[2] = (i - 16) * kYScale + YUV_HALF2;
	VP8kYtoRGBA[i].i32[3] = 0xff << YUV_FIX2;

	VP8kUtoRGBA[i].i32[0] = 0;
	VP8kUtoRGBA[i].i32[1] = -kUToG * (i - 128);
	VP8kUtoRGBA[i].i32[2] = kUToB * (i - 128);
	VP8kUtoRGBA[i].i32[3] = 0;

	VP8kVtoRGBA[i].i32[0] = kVToR * (i - 128);
	VP8kVtoRGBA[i].i32[1] = -kVToG * (i - 128);
	VP8kVtoRGBA[i].i32[2] = 0;
	VP8kVtoRGBA[i].i32[3] = 0;
	}
	done_sse2 = 1;

	#if 0 // code used to generate 'yuv_tables_sse2.h'
	printf("static const VP8kCstSSE2 VP8kYtoRGBA[256] = {\n");
	for (i = 0; i < 256; ++i) {
	printf(" {{0x%.8x, 0x%.8x, 0x%.8x, 0x%.8x}},\n",
	VP8kYtoRGBA[i].i32[0], VP8kYtoRGBA[i].i32[1],
	VP8kYtoRGBA[i].i32[2], VP8kYtoRGBA[i].i32[3]);
	}
	printf("};\n\n");
	printf("static const VP8kCstSSE2 VP8kUtoRGBA[256] = {\n");
	for (i = 0; i < 256; ++i) {
	printf(" {{0, 0x%.8x, 0x%.8x, 0}},\n",
	VP8kUtoRGBA[i].i32[1], VP8kUtoRGBA[i].i32[2]);
	}
	printf("};\n\n");
	printf("static VP8kCstSSE2 VP8kVtoRGBA[256] = {\n");
	for (i = 0; i < 256; ++i) {
	printf(" {{0x%.8x, 0x%.8x, 0, 0}},\n",
	VP8kVtoRGBA[i].i32[0], VP8kVtoRGBA[i].i32[1]);
	}
	printf("};\n\n");
	#endif
	}
	}

	#endif // WEBP_YUV_USE_SSE2_TABLES

	//-----------------------------------------------------------------------------

	static WEBP_INLINE __m128i LoadUVPart(int u, int v) {
	const __m128i u_part = _mm_loadu_si128(&VP8kUtoRGBA[u].m);
	const __m128i v_part = _mm_loadu_si128(&VP8kVtoRGBA[v].m);
	const __m128i uv_part = _mm_add_epi32(u_part, v_part);
	return uv_part;
	}

	static WEBP_INLINE __m128i GetRGBA32bWithUV(int y, const __m128i uv_part) {
	const __m128i y_part = _mm_loadu_si128(&VP8kYtoRGBA[y].m);
	const __m128i rgba1 = _mm_add_epi32(y_part, uv_part);
	const __m128i rgba2 = _mm_srai_epi32(rgba1, YUV_FIX2);
	return rgba2;
	}

	static WEBP_INLINE __m128i GetRGBA32b(int y, int u, int v) {
	const __m128i uv_part = LoadUVPart(u, v);
	return GetRGBA32bWithUV(y, uv_part);
	}

	static WEBP_INLINE void YuvToRgbSSE2(uint8_t y, uint8_t u, uint8_t v,
	uint8_t* const rgb) {
	const __m128i tmp0 = GetRGBA32b(y, u, v);
	const __m128i tmp1 = _mm_packs_epi32(tmp0, tmp0);
	const __m128i tmp2 = _mm_packus_epi16(tmp1, tmp1);
	// Note: we store 8 bytes at a time, not 3 bytes! -> memory stomp
	_mm_storel_epi64((__m128i*)rgb, tmp2);
	}

	static WEBP_INLINE void YuvToBgrSSE2(uint8_t y, uint8_t u, uint8_t v,
	uint8_t* const bgr) {
	const __m128i tmp0 = GetRGBA32b(y, u, v);
	const __m128i tmp1 = _mm_shuffle_epi32(tmp0, _MM_SHUFFLE(3, 0, 1, 2));
	const __m128i tmp2 = _mm_packs_epi32(tmp1, tmp1);
	const __m128i tmp3 = _mm_packus_epi16(tmp2, tmp2);
	// Note: we store 8 bytes at a time, not 3 bytes! -> memory stomp
	_mm_storel_epi64((__m128i*)bgr, tmp3);
	}

	//-----------------------------------------------------------------------------
	// Convert spans of 32 pixels to various RGB formats for the fancy upsampler.

	#ifdef FANCY_UPSAMPLING

	void VP8YuvToRgba32(const uint8_t* y, const uint8_t* u, const uint8_t* v,
	uint8_t* dst) {
	int n;
	for (n = 0; n < 32; n += 4) {
	const __m128i tmp0_1 = GetRGBA32b(y[n + 0], u[n + 0], v[n + 0]);
	const __m128i tmp0_2 = GetRGBA32b(y[n + 1], u[n + 1], v[n + 1]);
	const __m128i tmp0_3 = GetRGBA32b(y[n + 2], u[n + 2], v[n + 2]);
	const __m128i tmp0_4 = GetRGBA32b(y[n + 3], u[n + 3], v[n + 3]);
	const __m128i tmp1_1 = _mm_packs_epi32(tmp0_1, tmp0_2);
	const __m128i tmp1_2 = _mm_packs_epi32(tmp0_3, tmp0_4);
	const __m128i tmp2 = _mm_packus_epi16(tmp1_1, tmp1_2);
	_mm_storeu_si128((__m128i*)dst, tmp2);
	dst += 4 * 4;
	}
	}

	void VP8YuvToBgra32(const uint8_t* y, const uint8_t* u, const uint8_t* v,
	uint8_t* dst) {
	int n;
	for (n = 0; n < 32; n += 2) {
	const __m128i tmp0_1 = GetRGBA32b(y[n + 0], u[n + 0], v[n + 0]);
	const __m128i tmp0_2 = GetRGBA32b(y[n + 1], u[n + 1], v[n + 1]);
	const __m128i tmp1_1 = _mm_shuffle_epi32(tmp0_1, _MM_SHUFFLE(3, 0, 1, 2));
	const __m128i tmp1_2 = _mm_shuffle_epi32(tmp0_2, _MM_SHUFFLE(3, 0, 1, 2));
	const __m128i tmp2_1 = _mm_packs_epi32(tmp1_1, tmp1_2);
	const __m128i tmp3 = _mm_packus_epi16(tmp2_1, tmp2_1);
	_mm_storel_epi64((__m128i*)dst, tmp3);
	dst += 4 * 2;
	}
	}

	void VP8YuvToRgb32(const uint8_t* y, const uint8_t* u, const uint8_t* v,
	uint8_t* dst) {
	int n;
	uint8_t tmp0[2 * 3 + 5 + 15];
	uint8_t* const tmp = (uint8_t*)((uintptr_t)(tmp0 + 15) & ~15); // align
	for (n = 0; n < 30; ++n) { // we directly stomp the *dst memory
	YuvToRgbSSE2(y[n], u[n], v[n], dst + n * 3);
	}
	// Last two pixels are special: we write in a tmp buffer before sending
	// to dst.
	YuvToRgbSSE2(y[n + 0], u[n + 0], v[n + 0], tmp + 0);
	YuvToRgbSSE2(y[n + 1], u[n + 1], v[n + 1], tmp + 3);
	memcpy(dst + n * 3, tmp, 2 * 3);
	}

	void VP8YuvToBgr32(const uint8_t* y, const uint8_t* u, const uint8_t* v,
	uint8_t* dst) {
	int n;
	uint8_t tmp0[2 * 3 + 5 + 15];
	uint8_t* const tmp = (uint8_t*)((uintptr_t)(tmp0 + 15) & ~15); // align
	for (n = 0; n < 30; ++n) {
	YuvToBgrSSE2(y[n], u[n], v[n], dst + n * 3);
	}
	YuvToBgrSSE2(y[n + 0], u[n + 0], v[n + 0], tmp + 0);
	YuvToBgrSSE2(y[n + 1], u[n + 1], v[n + 1], tmp + 3);
	memcpy(dst + n * 3, tmp, 2 * 3);
	}

	#endif // FANCY_UPSAMPLING

	//-----------------------------------------------------------------------------
	// Arbitrary-length row conversion functions

	static void YuvToRgbaRowSSE2(const uint8_t* y,
	const uint8_t* u, const uint8_t* v,
	uint8_t* dst, int len) {
	int n;
	for (n = 0; n + 4 <= len; n += 4) {
	const __m128i uv_0 = LoadUVPart(u[0], v[0]);
	const __m128i uv_1 = LoadUVPart(u[1], v[1]);
	const __m128i tmp0_1 = GetRGBA32bWithUV(y[0], uv_0);
	const __m128i tmp0_2 = GetRGBA32bWithUV(y[1], uv_0);
	const __m128i tmp0_3 = GetRGBA32bWithUV(y[2], uv_1);
	const __m128i tmp0_4 = GetRGBA32bWithUV(y[3], uv_1);
	const __m128i tmp1_1 = _mm_packs_epi32(tmp0_1, tmp0_2);
	const __m128i tmp1_2 = _mm_packs_epi32(tmp0_3, tmp0_4);
	const __m128i tmp2 = _mm_packus_epi16(tmp1_1, tmp1_2);
	_mm_storeu_si128((__m128i*)dst, tmp2);
	dst += 4 * 4;
	y += 4;
	u += 2;
	v += 2;
	}
	// Finish off
	while (n < len) {
	VP8YuvToRgba(y[0], u[0], v[0], dst);
	dst += 4;
	++y;
	u += (n & 1);
	v += (n & 1);
	++n;
	}
	}

	static void YuvToBgraRowSSE2(const uint8_t* y,
	const uint8_t* u, const uint8_t* v,
	uint8_t* dst, int len) {
	int n;
	for (n = 0; n + 2 <= len; n += 2) {
	const __m128i uv_0 = LoadUVPart(u[0], v[0]);
	const __m128i tmp0_1 = GetRGBA32bWithUV(y[0], uv_0);
	const __m128i tmp0_2 = GetRGBA32bWithUV(y[1], uv_0);
	const __m128i tmp1_1 = _mm_shuffle_epi32(tmp0_1, _MM_SHUFFLE(3, 0, 1, 2));
	const __m128i tmp1_2 = _mm_shuffle_epi32(tmp0_2, _MM_SHUFFLE(3, 0, 1, 2));
	const __m128i tmp2_1 = _mm_packs_epi32(tmp1_1, tmp1_2);
	const __m128i tmp3 = _mm_packus_epi16(tmp2_1, tmp2_1);
	_mm_storel_epi64((__m128i*)dst, tmp3);
	dst += 4 * 2;
	y += 2;
	++u;
	++v;
	}
	// Finish off
	if (len & 1) {
	VP8YuvToBgra(y[0], u[0], v[0], dst);
	}
	}

	static void YuvToArgbRowSSE2(const uint8_t* y,
	const uint8_t* u, const uint8_t* v,
	uint8_t* dst, int len) {
	int n;
	for (n = 0; n + 2 <= len; n += 2) {
	const __m128i uv_0 = LoadUVPart(u[0], v[0]);
	const __m128i tmp0_1 = GetRGBA32bWithUV(y[0], uv_0);
	const __m128i tmp0_2 = GetRGBA32bWithUV(y[1], uv_0);
	const __m128i tmp1_1 = _mm_shuffle_epi32(tmp0_1, _MM_SHUFFLE(2, 1, 0, 3));
	const __m128i tmp1_2 = _mm_shuffle_epi32(tmp0_2, _MM_SHUFFLE(2, 1, 0, 3));
	const __m128i tmp2_1 = _mm_packs_epi32(tmp1_1, tmp1_2);
	const __m128i tmp3 = _mm_packus_epi16(tmp2_1, tmp2_1);
	_mm_storel_epi64((__m128i*)dst, tmp3);
	dst += 4 * 2;
	y += 2;
	++u;
	++v;
	}
	// Finish off
	if (len & 1) {
	VP8YuvToArgb(y[0], u[0], v[0], dst);
	}
	}

	static void YuvToRgbRowSSE2(const uint8_t* y,
	const uint8_t* u, const uint8_t* v,
	uint8_t* dst, int len) {
	int n;
	for (n = 0; n + 2 < len; ++n) { // we directly stomp the *dst memory
	YuvToRgbSSE2(y[0], u[0], v[0], dst); // stomps 8 bytes
	dst += 3;
	++y;
	u += (n & 1);
	v += (n & 1);
	}
	VP8YuvToRgb(y[0], u[0], v[0], dst);
	if (len > 1) {
	VP8YuvToRgb(y[1], u[n & 1], v[n & 1], dst + 3);
	}
	}

	static void YuvToBgrRowSSE2(const uint8_t* y,
	const uint8_t* u, const uint8_t* v,
	uint8_t* dst, int len) {
	int n;
	for (n = 0; n + 2 < len; ++n) { // we directly stomp the *dst memory
	YuvToBgrSSE2(y[0], u[0], v[0], dst); // stomps 8 bytes
	dst += 3;
	++y;
	u += (n & 1);
	v += (n & 1);
	}
	VP8YuvToBgr(y[0], u[0], v[0], dst + 0);
	if (len > 1) {
	VP8YuvToBgr(y[1], u[n & 1], v[n & 1], dst + 3);
	}
	}

	#endif // WEBP_USE_SSE2

	//------------------------------------------------------------------------------
	// Entry point

	extern void WebPInitSamplersSSE2(void);

	void WebPInitSamplersSSE2(void) {
	#if defined(WEBP_USE_SSE2)
	WebPSamplers[MODE_RGB] = YuvToRgbRowSSE2;
	WebPSamplers[MODE_RGBA] = YuvToRgbaRowSSE2;
	WebPSamplers[MODE_BGR] = YuvToBgrRowSSE2;
	WebPSamplers[MODE_BGRA] = YuvToBgraRowSSE2;
	WebPSamplers[MODE_ARGB] = YuvToArgbRowSSE2;
	#endif // WEBP_USE_SSE2
	}