src/opts/SkBitmapProcState_opts_SSE2.cpp - platform/external/skia - Gitiles

 /*
  * Copyright 2009 The Android Open Source Project
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */

 #include "SkBitmapProcState_opts_SSE2.h"
 #include "SkBitmapProcState_utils.h"
 #include "SkColorData.h"
 #include "SkPaint.h"
 #include "SkTo.h"
 #include "SkUtils.h"

 #include <emmintrin.h>

 void S32_opaque_D32_filter_DX_SSE2(const SkBitmapProcState& s,
                                    const uint32_t* xy,
                                    int count, uint32_t* colors) {
     SkASSERT(count > 0 && colors != nullptr);
     SkASSERT(s.fFilterQuality != kNone_SkFilterQuality);
     SkASSERT(kN32_SkColorType == s.fPixmap.colorType());
     SkASSERT(s.fAlphaScale == 256);

     const char* srcAddr = static_cast<const char*>(s.fPixmap.addr());
     size_t rb = s.fPixmap.rowBytes();
     uint32_t XY = *xy++;
     unsigned y0 = XY >> 14;
     const uint32_t* row0 = reinterpret_cast<const uint32_t*>(srcAddr + (y0 >> 4) * rb);
     const uint32_t* row1 = reinterpret_cast<const uint32_t*>(srcAddr + (XY & 0x3FFF) * rb);
     unsigned subY = y0 & 0xF;

     // ( 0,  0,  0,  0,  0,  0,  0, 16)
     __m128i sixteen = _mm_cvtsi32_si128(16);

     // ( 0,  0,  0,  0, 16, 16, 16, 16)
     sixteen = _mm_shufflelo_epi16(sixteen, 0);

     // ( 0,  0,  0,  0,  0,  0,  0,  y)
     __m128i allY = _mm_cvtsi32_si128(subY);

     // ( 0,  0,  0,  0,  y,  y,  y,  y)
     allY = _mm_shufflelo_epi16(allY, 0);

     // ( 0,  0,  0,  0, 16-y, 16-y, 16-y, 16-y)
     __m128i negY = _mm_sub_epi16(sixteen, allY);

     // (16-y, 16-y, 16-y, 16-y, y, y, y, y)
     allY = _mm_unpacklo_epi64(allY, negY);

     // (16, 16, 16, 16, 16, 16, 16, 16 )
     sixteen = _mm_shuffle_epi32(sixteen, 0);

     // ( 0,  0,  0,  0,  0,  0,  0,  0)
     __m128i zero = _mm_setzero_si128();
     do {
         uint32_t XX = *xy++;    // x0:14 | 4 | x1:14
         unsigned x0 = XX >> 18;
         unsigned x1 = XX & 0x3FFF;

         // (0, 0, 0, 0, 0, 0, 0, x)
         __m128i allX = _mm_cvtsi32_si128((XX >> 14) & 0x0F);

         // (0, 0, 0, 0, x, x, x, x)
         allX = _mm_shufflelo_epi16(allX, 0);

         // (x, x, x, x, x, x, x, x)
         allX = _mm_shuffle_epi32(allX, 0);

         // (16-x, 16-x, 16-x, 16-x, 16-x, 16-x, 16-x)
         __m128i negX = _mm_sub_epi16(sixteen, allX);

         // Load 4 samples (pixels).
         __m128i a00 = _mm_cvtsi32_si128(row0[x0]);
         __m128i a01 = _mm_cvtsi32_si128(row0[x1]);
         __m128i a10 = _mm_cvtsi32_si128(row1[x0]);
         __m128i a11 = _mm_cvtsi32_si128(row1[x1]);

         // (0, 0, a00, a10)
         __m128i a00a10 = _mm_unpacklo_epi32(a10, a00);

         // Expand to 16 bits per component.
         a00a10 = _mm_unpacklo_epi8(a00a10, zero);

         // ((a00 * (16-y)), (a10 * y)).
         a00a10 = _mm_mullo_epi16(a00a10, allY);

         // (a00 * (16-y) * (16-x), a10 * y * (16-x)).
         a00a10 = _mm_mullo_epi16(a00a10, negX);

         // (0, 0, a01, a10)
         __m128i a01a11 = _mm_unpacklo_epi32(a11, a01);

         // Expand to 16 bits per component.
         a01a11 = _mm_unpacklo_epi8(a01a11, zero);

         // (a01 * (16-y)), (a11 * y)
         a01a11 = _mm_mullo_epi16(a01a11, allY);

         // (a01 * (16-y) * x), (a11 * y * x)
         a01a11 = _mm_mullo_epi16(a01a11, allX);

         // (a00*w00 + a01*w01, a10*w10 + a11*w11)
         __m128i sum = _mm_add_epi16(a00a10, a01a11);

         // (DC, a00*w00 + a01*w01)
         __m128i shifted = _mm_shuffle_epi32(sum, 0xEE);

         // (DC, a00*w00 + a01*w01 + a10*w10 + a11*w11)
         sum = _mm_add_epi16(sum, shifted);

         // Divide each 16 bit component by 256.
         sum = _mm_srli_epi16(sum, 8);

         // Pack lower 4 16 bit values of sum into lower 4 bytes.
         sum = _mm_packus_epi16(sum, zero);

         // Extract low int and store.
         *colors++ = _mm_cvtsi128_si32(sum);
     } while (--count > 0);
 }

 void S32_alpha_D32_filter_DX_SSE2(const SkBitmapProcState& s,
                                   const uint32_t* xy,
                                   int count, uint32_t* colors) {
     SkASSERT(count > 0 && colors != nullptr);
     SkASSERT(s.fFilterQuality != kNone_SkFilterQuality);
     SkASSERT(kN32_SkColorType == s.fPixmap.colorType());
     SkASSERT(s.fAlphaScale < 256);

     const char* srcAddr = static_cast<const char*>(s.fPixmap.addr());
     size_t rb = s.fPixmap.rowBytes();
     uint32_t XY = *xy++;
     unsigned y0 = XY >> 14;
     const uint32_t* row0 = reinterpret_cast<const uint32_t*>(srcAddr + (y0 >> 4) * rb);
     const uint32_t* row1 = reinterpret_cast<const uint32_t*>(srcAddr + (XY & 0x3FFF) * rb);
     unsigned subY = y0 & 0xF;

     // ( 0,  0,  0,  0,  0,  0,  0, 16)
     __m128i sixteen = _mm_cvtsi32_si128(16);

     // ( 0,  0,  0,  0, 16, 16, 16, 16)
     sixteen = _mm_shufflelo_epi16(sixteen, 0);

     // ( 0,  0,  0,  0,  0,  0,  0,  y)
     __m128i allY = _mm_cvtsi32_si128(subY);

     // ( 0,  0,  0,  0,  y,  y,  y,  y)
     allY = _mm_shufflelo_epi16(allY, 0);

     // ( 0,  0,  0,  0, 16-y, 16-y, 16-y, 16-y)
     __m128i negY = _mm_sub_epi16(sixteen, allY);

     // (16-y, 16-y, 16-y, 16-y, y, y, y, y)
     allY = _mm_unpacklo_epi64(allY, negY);

     // (16, 16, 16, 16, 16, 16, 16, 16 )
     sixteen = _mm_shuffle_epi32(sixteen, 0);

     // ( 0,  0,  0,  0,  0,  0,  0,  0)
     __m128i zero = _mm_setzero_si128();

     // ( alpha, alpha, alpha, alpha, alpha, alpha, alpha, alpha )
     __m128i alpha = _mm_set1_epi16(s.fAlphaScale);

     do {
         uint32_t XX = *xy++;    // x0:14 | 4 | x1:14
         unsigned x0 = XX >> 18;
         unsigned x1 = XX & 0x3FFF;

         // (0, 0, 0, 0, 0, 0, 0, x)
         __m128i allX = _mm_cvtsi32_si128((XX >> 14) & 0x0F);

         // (0, 0, 0, 0, x, x, x, x)
         allX = _mm_shufflelo_epi16(allX, 0);

         // (x, x, x, x, x, x, x, x)
         allX = _mm_shuffle_epi32(allX, 0);

         // (16-x, 16-x, 16-x, 16-x, 16-x, 16-x, 16-x)
         __m128i negX = _mm_sub_epi16(sixteen, allX);

         // Load 4 samples (pixels).
         __m128i a00 = _mm_cvtsi32_si128(row0[x0]);
         __m128i a01 = _mm_cvtsi32_si128(row0[x1]);
         __m128i a10 = _mm_cvtsi32_si128(row1[x0]);
         __m128i a11 = _mm_cvtsi32_si128(row1[x1]);

         // (0, 0, a00, a10)
         __m128i a00a10 = _mm_unpacklo_epi32(a10, a00);

         // Expand to 16 bits per component.
         a00a10 = _mm_unpacklo_epi8(a00a10, zero);

         // ((a00 * (16-y)), (a10 * y)).
         a00a10 = _mm_mullo_epi16(a00a10, allY);

         // (a00 * (16-y) * (16-x), a10 * y * (16-x)).
         a00a10 = _mm_mullo_epi16(a00a10, negX);

         // (0, 0, a01, a10)
         __m128i a01a11 = _mm_unpacklo_epi32(a11, a01);

         // Expand to 16 bits per component.
         a01a11 = _mm_unpacklo_epi8(a01a11, zero);

         // (a01 * (16-y)), (a11 * y)
         a01a11 = _mm_mullo_epi16(a01a11, allY);

         // (a01 * (16-y) * x), (a11 * y * x)
         a01a11 = _mm_mullo_epi16(a01a11, allX);

         // (a00*w00 + a01*w01, a10*w10 + a11*w11)
         __m128i sum = _mm_add_epi16(a00a10, a01a11);

         // (DC, a00*w00 + a01*w01)
         __m128i shifted = _mm_shuffle_epi32(sum, 0xEE);

         // (DC, a00*w00 + a01*w01 + a10*w10 + a11*w11)
         sum = _mm_add_epi16(sum, shifted);

         // Divide each 16 bit component by 256.
         sum = _mm_srli_epi16(sum, 8);

         // Multiply by alpha.
         sum = _mm_mullo_epi16(sum, alpha);

         // Divide each 16 bit component by 256.
         sum = _mm_srli_epi16(sum, 8);

         // Pack lower 4 16 bit values of sum into lower 4 bytes.
         sum = _mm_packus_epi16(sum, zero);

         // Extract low int and store.
         *colors++ = _mm_cvtsi128_si32(sum);
     } while (--count > 0);
 }

 // Temporarily go into 64bit so we don't overflow during the add. Since we shift down by 16
 // in the end, the result should always fit back in 32bits.
 static inline int32_t safe_fixed_add_shift(SkFixed a, SkFixed b) {
     int64_t tmp = a;
     return SkToS32((tmp + b) >> 16);
 }

 static inline uint32_t ClampX_ClampY_pack_filter(SkFixed f, unsigned max,
                                                  SkFixed one) {
     unsigned i = SkClampMax(f >> 16, max);
     i = (i << 4) | ((f >> 12) & 0xF);
     return (i << 14) | SkClampMax(safe_fixed_add_shift(f, one), max);
 }

 /*  SSE version of ClampX_ClampY_filter_scale()
  *  portable version is in core/SkBitmapProcState_matrix.h
  */
 void ClampX_ClampY_filter_scale_SSE2(const SkBitmapProcState& s, uint32_t xy[],
                                      int count, int x, int y) {
     SkASSERT((s.fInvType & ~(SkMatrix::kTranslate_Mask |
                              SkMatrix::kScale_Mask)) == 0);
     SkASSERT(s.fInvKy == 0);

     const unsigned maxX = s.fPixmap.width() - 1;
     const SkFixed one = s.fFilterOneX;
     const SkFixed dx = s.fInvSx;

     const SkBitmapProcStateAutoMapper mapper(s, x, y);
     const SkFixed fy = mapper.fixedY();
     const unsigned maxY = s.fPixmap.height() - 1;
     // compute our two Y values up front
     *xy++ = ClampX_ClampY_pack_filter(fy, maxY, s.fFilterOneY);
     // now initialize fx
     SkFixed fx = mapper.fixedX();

     // test if we don't need to apply the tile proc
     if (can_truncate_to_fixed_for_decal(fx, dx, count, maxX)) {
         if (count >= 4) {
             // SSE version of decal_filter_scale
             while ((size_t(xy) & 0x0F) != 0) {
                 SkASSERT((fx >> (16 + 14)) == 0);
                 *xy++ = (fx >> 12 << 14) | ((fx >> 16) + 1);
                 fx += dx;
                 count--;
             }

             __m128i wide_1    = _mm_set1_epi32(1);
             __m128i wide_dx4  = _mm_set1_epi32(dx * 4);
             __m128i wide_fx   = _mm_set_epi32(fx + dx * 3, fx + dx * 2,
                                               fx + dx, fx);

             while (count >= 4) {
                 __m128i wide_out;

                 wide_out = _mm_slli_epi32(_mm_srai_epi32(wide_fx, 12), 14);
                 wide_out = _mm_or_si128(wide_out, _mm_add_epi32(
                                         _mm_srai_epi32(wide_fx, 16), wide_1));

                 _mm_store_si128(reinterpret_cast<__m128i*>(xy), wide_out);

                 xy += 4;
                 fx += dx * 4;
                 wide_fx  = _mm_add_epi32(wide_fx, wide_dx4);
                 count -= 4;
             } // while count >= 4
         } // if count >= 4

         while (count-- > 0) {
             SkASSERT((fx >> (16 + 14)) == 0);
             *xy++ = (fx >> 12 << 14) | ((fx >> 16) + 1);
             fx += dx;
         }
     } else {
         // SSE2 only support 16bit interger max & min, so only process the case
         // maxX less than the max 16bit interger. Actually maxX is the bitmap's
         // height, there should be rare bitmap whose height will be greater
         // than max 16bit interger in the real world.
         if ((count >= 4) && (maxX <= 0xFFFF)) {
             while (((size_t)xy & 0x0F) != 0) {
                 *xy++ = ClampX_ClampY_pack_filter(fx, maxX, one);
                 fx += dx;
                 count--;
             }

             __m128i wide_fx   = _mm_set_epi32(fx + dx * 3, fx + dx * 2,
                                               fx + dx, fx);
             __m128i wide_dx4  = _mm_set1_epi32(dx * 4);
             __m128i wide_one  = _mm_set1_epi32(one);
             __m128i wide_maxX = _mm_set1_epi32(maxX);
             __m128i wide_mask = _mm_set1_epi32(0xF);

              while (count >= 4) {
                 __m128i wide_i;
                 __m128i wide_lo;
                 __m128i wide_fx1;

                 // i = SkClampMax(f>>16,maxX)
                 wide_i = _mm_max_epi16(_mm_srli_epi32(wide_fx, 16),
                                        _mm_setzero_si128());
                 wide_i = _mm_min_epi16(wide_i, wide_maxX);

                 // i<<4 | EXTRACT_LOW_BITS(fx)
                 wide_lo = _mm_srli_epi32(wide_fx, 12);
                 wide_lo = _mm_and_si128(wide_lo, wide_mask);
                 wide_i  = _mm_slli_epi32(wide_i, 4);
                 wide_i  = _mm_or_si128(wide_i, wide_lo);

                 // i<<14
                 wide_i = _mm_slli_epi32(wide_i, 14);

                 // SkClampMax(((f+one))>>16,max)
                 wide_fx1 = _mm_add_epi32(wide_fx, wide_one);
                 wide_fx1 = _mm_max_epi16(_mm_srli_epi32(wide_fx1, 16),
                                                         _mm_setzero_si128());
                 wide_fx1 = _mm_min_epi16(wide_fx1, wide_maxX);

                 // final combination
                 wide_i = _mm_or_si128(wide_i, wide_fx1);
                 _mm_store_si128(reinterpret_cast<__m128i*>(xy), wide_i);

                 wide_fx = _mm_add_epi32(wide_fx, wide_dx4);
                 fx += dx * 4;
                 xy += 4;
                 count -= 4;
             } // while count >= 4
         } // if count >= 4

     /*
         while (count-- > 0) {
             *xy++ = ClampX_ClampY_pack_filter(fx, maxX, one);
             fx += dx;
         }
         We'd like to write this as above, but that form allows fx to get 1-iteration too big/small
         when count is 0, and this can trigger a UBSAN error, even though we won't in fact use that
         last (undefined) value for fx.

         Here is an alternative that should always be efficient, but seems much harder to read:

         if (count > 0) {
             for (;;) {
                 *xy++ = ClampX_ClampY_pack_filter(fx, maxX, one);
                 if (--count == 0) break;
                 fx += dx;
             }
         }

         For now, we'll try this variant: more compact than the if/for version, and we hope the
         compiler will get rid of the integer multiply.
      */
         for (int i = 0; i < count; ++i) {
             *xy++ = ClampX_ClampY_pack_filter(fx + i*dx, maxX, one);
         }
     }
 }

 /*  SSE version of ClampX_ClampY_nofilter_scale()
  *  portable version is in core/SkBitmapProcState_matrix.h
  */
 void ClampX_ClampY_nofilter_scale_SSE2(const SkBitmapProcState& s,
                                     uint32_t xy[], int count, int x, int y) {
     SkASSERT((s.fInvType & ~(SkMatrix::kTranslate_Mask |
                              SkMatrix::kScale_Mask)) == 0);

     // we store y, x, x, x, x, x
     const unsigned maxX = s.fPixmap.width() - 1;
     const SkBitmapProcStateAutoMapper mapper(s, x, y);
     const unsigned maxY = s.fPixmap.height() - 1;
     *xy++ = SkClampMax(mapper.intY(), maxY);
     SkFixed fx = mapper.fixedX();

     if (0 == maxX) {
         // all of the following X values must be 0
         memset(xy, 0, count * sizeof(uint16_t));
         return;
     }

     const SkFixed dx = s.fInvSx;

     // test if we don't need to apply the tile proc
     if ((unsigned)(fx >> 16) <= maxX &&
         (unsigned)((fx + dx * (count - 1)) >> 16) <= maxX) {
         // SSE version of decal_nofilter_scale
         if (count >= 8) {
             while (((size_t)xy & 0x0F) != 0) {
                 *xy++ = pack_two_shorts(fx >> 16, (fx + dx) >> 16);
                 fx += 2 * dx;
                 count -= 2;
             }

             __m128i wide_dx4 = _mm_set1_epi32(dx * 4);
             __m128i wide_dx8 = _mm_add_epi32(wide_dx4, wide_dx4);

             __m128i wide_low = _mm_set_epi32(fx + dx * 3, fx + dx * 2,
                                              fx + dx, fx);
             __m128i wide_high = _mm_add_epi32(wide_low, wide_dx4);

             while (count >= 8) {
                 __m128i wide_out_low = _mm_srli_epi32(wide_low, 16);
                 __m128i wide_out_high = _mm_srli_epi32(wide_high, 16);

                 __m128i wide_result = _mm_packs_epi32(wide_out_low,
                                                       wide_out_high);
                 _mm_store_si128(reinterpret_cast<__m128i*>(xy), wide_result);

                 wide_low = _mm_add_epi32(wide_low, wide_dx8);
                 wide_high = _mm_add_epi32(wide_high, wide_dx8);

                 xy += 4;
                 fx += dx * 8;
                 count -= 8;
             }
         } // if count >= 8

         uint16_t* xx = reinterpret_cast<uint16_t*>(xy);
         while (count-- > 0) {
             *xx++ = SkToU16(fx >> 16);
             fx += dx;
         }
     } else {
         // SSE2 only support 16bit interger max & min, so only process the case
         // maxX less than the max 16bit interger. Actually maxX is the bitmap's
         // height, there should be rare bitmap whose height will be greater
         // than max 16bit interger in the real world.
         if ((count >= 8) && (maxX <= 0xFFFF)) {
             while (((size_t)xy & 0x0F) != 0) {
                 *xy++ = pack_two_shorts(SkClampMax((fx + dx) >> 16, maxX),
                                         SkClampMax(fx >> 16, maxX));
                 fx += 2 * dx;
                 count -= 2;
             }

             __m128i wide_dx4 = _mm_set1_epi32(dx * 4);
             __m128i wide_dx8 = _mm_add_epi32(wide_dx4, wide_dx4);

             __m128i wide_low = _mm_set_epi32(fx + dx * 3, fx + dx * 2,
                                              fx + dx, fx);
             __m128i wide_high = _mm_add_epi32(wide_low, wide_dx4);
             __m128i wide_maxX = _mm_set1_epi32(maxX);

             while (count >= 8) {
                 __m128i wide_out_low = _mm_srli_epi32(wide_low, 16);
                 __m128i wide_out_high = _mm_srli_epi32(wide_high, 16);

                 wide_out_low  = _mm_max_epi16(wide_out_low,
                                               _mm_setzero_si128());
                 wide_out_low  = _mm_min_epi16(wide_out_low, wide_maxX);
                 wide_out_high = _mm_max_epi16(wide_out_high,
                                               _mm_setzero_si128());
                 wide_out_high = _mm_min_epi16(wide_out_high, wide_maxX);

                 __m128i wide_result = _mm_packs_epi32(wide_out_low,
                                                       wide_out_high);
                 _mm_store_si128(reinterpret_cast<__m128i*>(xy), wide_result);

                 wide_low  = _mm_add_epi32(wide_low, wide_dx8);
                 wide_high = _mm_add_epi32(wide_high, wide_dx8);

                 xy += 4;
                 fx += dx * 8;
                 count -= 8;
             }
         } // if count >= 8

         uint16_t* xx = reinterpret_cast<uint16_t*>(xy);
         while (count-- > 0) {
             *xx++ = SkClampMax(fx >> 16, maxX);
             fx += dx;
         }
     }
 }
	/*
	* Copyright 2009 The Android Open Source Project
	*
	* Use of this source code is governed by a BSD-style license that can be
	* found in the LICENSE file.
	*/

	#include "SkBitmapProcState_opts_SSE2.h"
	#include "SkBitmapProcState_utils.h"
	#include "SkColorData.h"
	#include "SkPaint.h"
	#include "SkTo.h"
	#include "SkUtils.h"

	#include <emmintrin.h>

	void S32_opaque_D32_filter_DX_SSE2(const SkBitmapProcState& s,
	const uint32_t* xy,
	int count, uint32_t* colors) {
	SkASSERT(count > 0 && colors != nullptr);
	SkASSERT(s.fFilterQuality != kNone_SkFilterQuality);
	SkASSERT(kN32_SkColorType == s.fPixmap.colorType());
	SkASSERT(s.fAlphaScale == 256);

	const char* srcAddr = static_cast<const char*>(s.fPixmap.addr());
	size_t rb = s.fPixmap.rowBytes();
	uint32_t XY = *xy++;
	unsigned y0 = XY >> 14;
	const uint32_t* row0 = reinterpret_cast<const uint32_t>(srcAddr + (y0 >> 4) rb);
	const uint32_t* row1 = reinterpret_cast<const uint32_t>(srcAddr + (XY & 0x3FFF) rb);
	unsigned subY = y0 & 0xF;

	// ( 0, 0, 0, 0, 0, 0, 0, 16)
	__m128i sixteen = _mm_cvtsi32_si128(16);

	// ( 0, 0, 0, 0, 16, 16, 16, 16)
	sixteen = _mm_shufflelo_epi16(sixteen, 0);

	// ( 0, 0, 0, 0, 0, 0, 0, y)
	__m128i allY = _mm_cvtsi32_si128(subY);

	// ( 0, 0, 0, 0, y, y, y, y)
	allY = _mm_shufflelo_epi16(allY, 0);

	// ( 0, 0, 0, 0, 16-y, 16-y, 16-y, 16-y)
	__m128i negY = _mm_sub_epi16(sixteen, allY);

	// (16-y, 16-y, 16-y, 16-y, y, y, y, y)
	allY = _mm_unpacklo_epi64(allY, negY);

	// (16, 16, 16, 16, 16, 16, 16, 16 )
	sixteen = _mm_shuffle_epi32(sixteen, 0);

	// ( 0, 0, 0, 0, 0, 0, 0, 0)
	__m128i zero = _mm_setzero_si128();
	do {
	uint32_t XX = *xy++; // x0:14 \| 4 \| x1:14
	unsigned x0 = XX >> 18;
	unsigned x1 = XX & 0x3FFF;

	// (0, 0, 0, 0, 0, 0, 0, x)
	__m128i allX = _mm_cvtsi32_si128((XX >> 14) & 0x0F);

	// (0, 0, 0, 0, x, x, x, x)
	allX = _mm_shufflelo_epi16(allX, 0);

	// (x, x, x, x, x, x, x, x)
	allX = _mm_shuffle_epi32(allX, 0);

	// (16-x, 16-x, 16-x, 16-x, 16-x, 16-x, 16-x)
	__m128i negX = _mm_sub_epi16(sixteen, allX);

	// Load 4 samples (pixels).
	__m128i a00 = _mm_cvtsi32_si128(row0[x0]);
	__m128i a01 = _mm_cvtsi32_si128(row0[x1]);
	__m128i a10 = _mm_cvtsi32_si128(row1[x0]);
	__m128i a11 = _mm_cvtsi32_si128(row1[x1]);

	// (0, 0, a00, a10)
	__m128i a00a10 = _mm_unpacklo_epi32(a10, a00);

	// Expand to 16 bits per component.
	a00a10 = _mm_unpacklo_epi8(a00a10, zero);

	// ((a00 * (16-y)), (a10 * y)).
	a00a10 = _mm_mullo_epi16(a00a10, allY);

	// (a00 * (16-y) * (16-x), a10 * y * (16-x)).
	a00a10 = _mm_mullo_epi16(a00a10, negX);

	// (0, 0, a01, a10)
	__m128i a01a11 = _mm_unpacklo_epi32(a11, a01);

	// Expand to 16 bits per component.
	a01a11 = _mm_unpacklo_epi8(a01a11, zero);

	// (a01 * (16-y)), (a11 * y)
	a01a11 = _mm_mullo_epi16(a01a11, allY);

	// (a01 * (16-y) * x), (a11 * y * x)
	a01a11 = _mm_mullo_epi16(a01a11, allX);

	// (a00w00 + a01w01, a10w10 + a11w11)
	__m128i sum = _mm_add_epi16(a00a10, a01a11);

	// (DC, a00w00 + a01w01)
	__m128i shifted = _mm_shuffle_epi32(sum, 0xEE);

	// (DC, a00w00 + a01w01 + a10w10 + a11w11)
	sum = _mm_add_epi16(sum, shifted);

	// Divide each 16 bit component by 256.
	sum = _mm_srli_epi16(sum, 8);

	// Pack lower 4 16 bit values of sum into lower 4 bytes.
	sum = _mm_packus_epi16(sum, zero);

	// Extract low int and store.
	*colors++ = _mm_cvtsi128_si32(sum);
	} while (--count > 0);
	}

	void S32_alpha_D32_filter_DX_SSE2(const SkBitmapProcState& s,
	const uint32_t* xy,
	int count, uint32_t* colors) {
	SkASSERT(count > 0 && colors != nullptr);
	SkASSERT(s.fFilterQuality != kNone_SkFilterQuality);
	SkASSERT(kN32_SkColorType == s.fPixmap.colorType());
	SkASSERT(s.fAlphaScale < 256);

	const char* srcAddr = static_cast<const char*>(s.fPixmap.addr());
	size_t rb = s.fPixmap.rowBytes();
	uint32_t XY = *xy++;
	unsigned y0 = XY >> 14;
	const uint32_t* row0 = reinterpret_cast<const uint32_t>(srcAddr + (y0 >> 4) rb);
	const uint32_t* row1 = reinterpret_cast<const uint32_t>(srcAddr + (XY & 0x3FFF) rb);
	unsigned subY = y0 & 0xF;

	// ( 0, 0, 0, 0, 0, 0, 0, 16)
	__m128i sixteen = _mm_cvtsi32_si128(16);

	// ( 0, 0, 0, 0, 16, 16, 16, 16)
	sixteen = _mm_shufflelo_epi16(sixteen, 0);

	// ( 0, 0, 0, 0, 0, 0, 0, y)
	__m128i allY = _mm_cvtsi32_si128(subY);

	// ( 0, 0, 0, 0, y, y, y, y)
	allY = _mm_shufflelo_epi16(allY, 0);

	// ( 0, 0, 0, 0, 16-y, 16-y, 16-y, 16-y)
	__m128i negY = _mm_sub_epi16(sixteen, allY);

	// (16-y, 16-y, 16-y, 16-y, y, y, y, y)
	allY = _mm_unpacklo_epi64(allY, negY);

	// (16, 16, 16, 16, 16, 16, 16, 16 )
	sixteen = _mm_shuffle_epi32(sixteen, 0);

	// ( 0, 0, 0, 0, 0, 0, 0, 0)
	__m128i zero = _mm_setzero_si128();

	// ( alpha, alpha, alpha, alpha, alpha, alpha, alpha, alpha )
	__m128i alpha = _mm_set1_epi16(s.fAlphaScale);

	do {
	uint32_t XX = *xy++; // x0:14 \| 4 \| x1:14
	unsigned x0 = XX >> 18;
	unsigned x1 = XX & 0x3FFF;

	// (0, 0, 0, 0, 0, 0, 0, x)
	__m128i allX = _mm_cvtsi32_si128((XX >> 14) & 0x0F);

	// (0, 0, 0, 0, x, x, x, x)
	allX = _mm_shufflelo_epi16(allX, 0);

	// (x, x, x, x, x, x, x, x)
	allX = _mm_shuffle_epi32(allX, 0);

	// (16-x, 16-x, 16-x, 16-x, 16-x, 16-x, 16-x)
	__m128i negX = _mm_sub_epi16(sixteen, allX);

	// Load 4 samples (pixels).
	__m128i a00 = _mm_cvtsi32_si128(row0[x0]);
	__m128i a01 = _mm_cvtsi32_si128(row0[x1]);
	__m128i a10 = _mm_cvtsi32_si128(row1[x0]);
	__m128i a11 = _mm_cvtsi32_si128(row1[x1]);

	// (0, 0, a00, a10)
	__m128i a00a10 = _mm_unpacklo_epi32(a10, a00);

	// Expand to 16 bits per component.
	a00a10 = _mm_unpacklo_epi8(a00a10, zero);

	// ((a00 * (16-y)), (a10 * y)).
	a00a10 = _mm_mullo_epi16(a00a10, allY);

	// (a00 * (16-y) * (16-x), a10 * y * (16-x)).
	a00a10 = _mm_mullo_epi16(a00a10, negX);

	// (0, 0, a01, a10)
	__m128i a01a11 = _mm_unpacklo_epi32(a11, a01);

	// Expand to 16 bits per component.
	a01a11 = _mm_unpacklo_epi8(a01a11, zero);

	// (a01 * (16-y)), (a11 * y)
	a01a11 = _mm_mullo_epi16(a01a11, allY);

	// (a01 * (16-y) * x), (a11 * y * x)
	a01a11 = _mm_mullo_epi16(a01a11, allX);

	// (a00w00 + a01w01, a10w10 + a11w11)
	__m128i sum = _mm_add_epi16(a00a10, a01a11);

	// (DC, a00w00 + a01w01)
	__m128i shifted = _mm_shuffle_epi32(sum, 0xEE);

	// (DC, a00w00 + a01w01 + a10w10 + a11w11)
	sum = _mm_add_epi16(sum, shifted);

	// Divide each 16 bit component by 256.
	sum = _mm_srli_epi16(sum, 8);

	// Multiply by alpha.
	sum = _mm_mullo_epi16(sum, alpha);

	// Divide each 16 bit component by 256.
	sum = _mm_srli_epi16(sum, 8);

	// Pack lower 4 16 bit values of sum into lower 4 bytes.
	sum = _mm_packus_epi16(sum, zero);

	// Extract low int and store.
	*colors++ = _mm_cvtsi128_si32(sum);
	} while (--count > 0);
	}

	// Temporarily go into 64bit so we don't overflow during the add. Since we shift down by 16
	// in the end, the result should always fit back in 32bits.
	static inline int32_t safe_fixed_add_shift(SkFixed a, SkFixed b) {
	int64_t tmp = a;
	return SkToS32((tmp + b) >> 16);
	}

	static inline uint32_t ClampX_ClampY_pack_filter(SkFixed f, unsigned max,
	SkFixed one) {
	unsigned i = SkClampMax(f >> 16, max);
	i = (i << 4) \| ((f >> 12) & 0xF);
	return (i << 14) \| SkClampMax(safe_fixed_add_shift(f, one), max);
	}

	/* SSE version of ClampX_ClampY_filter_scale()
	* portable version is in core/SkBitmapProcState_matrix.h
	*/
	void ClampX_ClampY_filter_scale_SSE2(const SkBitmapProcState& s, uint32_t xy[],
	int count, int x, int y) {
	SkASSERT((s.fInvType & ~(SkMatrix::kTranslate_Mask \|
	SkMatrix::kScale_Mask)) == 0);
	SkASSERT(s.fInvKy == 0);

	const unsigned maxX = s.fPixmap.width() - 1;
	const SkFixed one = s.fFilterOneX;
	const SkFixed dx = s.fInvSx;

	const SkBitmapProcStateAutoMapper mapper(s, x, y);
	const SkFixed fy = mapper.fixedY();
	const unsigned maxY = s.fPixmap.height() - 1;
	// compute our two Y values up front
	*xy++ = ClampX_ClampY_pack_filter(fy, maxY, s.fFilterOneY);
	// now initialize fx
	SkFixed fx = mapper.fixedX();

	// test if we don't need to apply the tile proc
	if (can_truncate_to_fixed_for_decal(fx, dx, count, maxX)) {
	if (count >= 4) {
	// SSE version of decal_filter_scale
	while ((size_t(xy) & 0x0F) != 0) {
	SkASSERT((fx >> (16 + 14)) == 0);
	*xy++ = (fx >> 12 << 14) \| ((fx >> 16) + 1);
	fx += dx;
	count--;
	}

	__m128i wide_1 = _mm_set1_epi32(1);
	__m128i wide_dx4 = _mm_set1_epi32(dx * 4);
	__m128i wide_fx = _mm_set_epi32(fx + dx * 3, fx + dx * 2,
	fx + dx, fx);

	while (count >= 4) {
	__m128i wide_out;

	wide_out = _mm_slli_epi32(_mm_srai_epi32(wide_fx, 12), 14);
	wide_out = _mm_or_si128(wide_out, _mm_add_epi32(
	_mm_srai_epi32(wide_fx, 16), wide_1));

	_mm_store_si128(reinterpret_cast<__m128i*>(xy), wide_out);

	xy += 4;
	fx += dx * 4;
	wide_fx = _mm_add_epi32(wide_fx, wide_dx4);
	count -= 4;
	} // while count >= 4
	} // if count >= 4

	while (count-- > 0) {
	SkASSERT((fx >> (16 + 14)) == 0);
	*xy++ = (fx >> 12 << 14) \| ((fx >> 16) + 1);
	fx += dx;
	}
	} else {
	// SSE2 only support 16bit interger max & min, so only process the case
	// maxX less than the max 16bit interger. Actually maxX is the bitmap's
	// height, there should be rare bitmap whose height will be greater
	// than max 16bit interger in the real world.
	if ((count >= 4) && (maxX <= 0xFFFF)) {
	while (((size_t)xy & 0x0F) != 0) {
	*xy++ = ClampX_ClampY_pack_filter(fx, maxX, one);
	fx += dx;
	count--;
	}

	__m128i wide_fx = _mm_set_epi32(fx + dx * 3, fx + dx * 2,
	fx + dx, fx);
	__m128i wide_dx4 = _mm_set1_epi32(dx * 4);
	__m128i wide_one = _mm_set1_epi32(one);
	__m128i wide_maxX = _mm_set1_epi32(maxX);
	__m128i wide_mask = _mm_set1_epi32(0xF);

	while (count >= 4) {
	__m128i wide_i;
	__m128i wide_lo;
	__m128i wide_fx1;

	// i = SkClampMax(f>>16,maxX)
	wide_i = _mm_max_epi16(_mm_srli_epi32(wide_fx, 16),
	_mm_setzero_si128());
	wide_i = _mm_min_epi16(wide_i, wide_maxX);

	// i<<4 \| EXTRACT_LOW_BITS(fx)
	wide_lo = _mm_srli_epi32(wide_fx, 12);
	wide_lo = _mm_and_si128(wide_lo, wide_mask);
	wide_i = _mm_slli_epi32(wide_i, 4);
	wide_i = _mm_or_si128(wide_i, wide_lo);

	// i<<14
	wide_i = _mm_slli_epi32(wide_i, 14);

	// SkClampMax(((f+one))>>16,max)
	wide_fx1 = _mm_add_epi32(wide_fx, wide_one);
	wide_fx1 = _mm_max_epi16(_mm_srli_epi32(wide_fx1, 16),
	_mm_setzero_si128());
	wide_fx1 = _mm_min_epi16(wide_fx1, wide_maxX);

	// final combination
	wide_i = _mm_or_si128(wide_i, wide_fx1);
	_mm_store_si128(reinterpret_cast<__m128i*>(xy), wide_i);

	wide_fx = _mm_add_epi32(wide_fx, wide_dx4);
	fx += dx * 4;
	xy += 4;
	count -= 4;
	} // while count >= 4
	} // if count >= 4

	/*
	while (count-- > 0) {
	*xy++ = ClampX_ClampY_pack_filter(fx, maxX, one);
	fx += dx;
	}
	We'd like to write this as above, but that form allows fx to get 1-iteration too big/small
	when count is 0, and this can trigger a UBSAN error, even though we won't in fact use that
	last (undefined) value for fx.

	Here is an alternative that should always be efficient, but seems much harder to read:

	if (count > 0) {
	for (;;) {
	*xy++ = ClampX_ClampY_pack_filter(fx, maxX, one);
	if (--count == 0) break;
	fx += dx;
	}
	}

	For now, we'll try this variant: more compact than the if/for version, and we hope the
	compiler will get rid of the integer multiply.
	*/
	for (int i = 0; i < count; ++i) {
	xy++ = ClampX_ClampY_pack_filter(fx + idx, maxX, one);
	}
	}
	}

	/* SSE version of ClampX_ClampY_nofilter_scale()
	* portable version is in core/SkBitmapProcState_matrix.h
	*/
	void ClampX_ClampY_nofilter_scale_SSE2(const SkBitmapProcState& s,
	uint32_t xy[], int count, int x, int y) {
	SkASSERT((s.fInvType & ~(SkMatrix::kTranslate_Mask \|
	SkMatrix::kScale_Mask)) == 0);

	// we store y, x, x, x, x, x
	const unsigned maxX = s.fPixmap.width() - 1;
	const SkBitmapProcStateAutoMapper mapper(s, x, y);
	const unsigned maxY = s.fPixmap.height() - 1;
	*xy++ = SkClampMax(mapper.intY(), maxY);
	SkFixed fx = mapper.fixedX();

	if (0 == maxX) {
	// all of the following X values must be 0
	memset(xy, 0, count * sizeof(uint16_t));
	return;
	}

	const SkFixed dx = s.fInvSx;

	// test if we don't need to apply the tile proc
	if ((unsigned)(fx >> 16) <= maxX &&
	(unsigned)((fx + dx * (count - 1)) >> 16) <= maxX) {
	// SSE version of decal_nofilter_scale
	if (count >= 8) {
	while (((size_t)xy & 0x0F) != 0) {
	*xy++ = pack_two_shorts(fx >> 16, (fx + dx) >> 16);
	fx += 2 * dx;
	count -= 2;
	}

	__m128i wide_dx4 = _mm_set1_epi32(dx * 4);
	__m128i wide_dx8 = _mm_add_epi32(wide_dx4, wide_dx4);

	__m128i wide_low = _mm_set_epi32(fx + dx * 3, fx + dx * 2,
	fx + dx, fx);
	__m128i wide_high = _mm_add_epi32(wide_low, wide_dx4);

	while (count >= 8) {
	__m128i wide_out_low = _mm_srli_epi32(wide_low, 16);
	__m128i wide_out_high = _mm_srli_epi32(wide_high, 16);

	__m128i wide_result = _mm_packs_epi32(wide_out_low,
	wide_out_high);
	_mm_store_si128(reinterpret_cast<__m128i*>(xy), wide_result);

	wide_low = _mm_add_epi32(wide_low, wide_dx8);
	wide_high = _mm_add_epi32(wide_high, wide_dx8);

	xy += 4;
	fx += dx * 8;
	count -= 8;
	}
	} // if count >= 8

	uint16_t* xx = reinterpret_cast<uint16_t*>(xy);
	while (count-- > 0) {
	*xx++ = SkToU16(fx >> 16);
	fx += dx;
	}
	} else {
	// SSE2 only support 16bit interger max & min, so only process the case
	// maxX less than the max 16bit interger. Actually maxX is the bitmap's
	// height, there should be rare bitmap whose height will be greater
	// than max 16bit interger in the real world.
	if ((count >= 8) && (maxX <= 0xFFFF)) {
	while (((size_t)xy & 0x0F) != 0) {
	*xy++ = pack_two_shorts(SkClampMax((fx + dx) >> 16, maxX),
	SkClampMax(fx >> 16, maxX));
	fx += 2 * dx;
	count -= 2;
	}

	__m128i wide_dx4 = _mm_set1_epi32(dx * 4);
	__m128i wide_dx8 = _mm_add_epi32(wide_dx4, wide_dx4);

	__m128i wide_low = _mm_set_epi32(fx + dx * 3, fx + dx * 2,
	fx + dx, fx);
	__m128i wide_high = _mm_add_epi32(wide_low, wide_dx4);
	__m128i wide_maxX = _mm_set1_epi32(maxX);

	while (count >= 8) {
	__m128i wide_out_low = _mm_srli_epi32(wide_low, 16);
	__m128i wide_out_high = _mm_srli_epi32(wide_high, 16);

	wide_out_low = _mm_max_epi16(wide_out_low,
	_mm_setzero_si128());
	wide_out_low = _mm_min_epi16(wide_out_low, wide_maxX);
	wide_out_high = _mm_max_epi16(wide_out_high,
	_mm_setzero_si128());
	wide_out_high = _mm_min_epi16(wide_out_high, wide_maxX);

	__m128i wide_result = _mm_packs_epi32(wide_out_low,
	wide_out_high);
	_mm_store_si128(reinterpret_cast<__m128i*>(xy), wide_result);

	wide_low = _mm_add_epi32(wide_low, wide_dx8);
	wide_high = _mm_add_epi32(wide_high, wide_dx8);

	xy += 4;
	fx += dx * 8;
	count -= 8;
	}
	} // if count >= 8

	uint16_t* xx = reinterpret_cast<uint16_t*>(xy);
	while (count-- > 0) {
	*xx++ = SkClampMax(fx >> 16, maxX);
	fx += dx;
	}
	}
	}