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      1 /*
      2  * Copyright 2013 The Android Open Source Project
      3  *
      4  * Use of this source code is governed by a BSD-style license that can be
      5  * found in the LICENSE file.
      6  */
      7 
      8 #include <emmintrin.h>
      9 #include "SkColorPriv.h"
     10 #include "SkMorphology_opts_SSE2.h"
     11 
     12 /* SSE2 version of dilateX, dilateY, erodeX, erodeY.
     13  * portable versions are in src/effects/SkMorphologyImageFilter.cpp.
     14  */
     15 
     16 enum MorphType {
     17     kDilate, kErode
     18 };
     19 
     20 enum MorphDirection {
     21     kX, kY
     22 };
     23 
     24 template<MorphType type, MorphDirection direction>
     25 static void SkMorph_SSE2(const SkPMColor* src, SkPMColor* dst, int radius,
     26                          int width, int height, int srcStride, int dstStride)
     27 {
     28     const int srcStrideX = direction == kX ? 1 : srcStride;
     29     const int dstStrideX = direction == kX ? 1 : dstStride;
     30     const int srcStrideY = direction == kX ? srcStride : 1;
     31     const int dstStrideY = direction == kX ? dstStride : 1;
     32     radius = SkMin32(radius, width - 1);
     33     const SkPMColor* upperSrc = src + radius * srcStrideX;
     34     for (int x = 0; x < width; ++x) {
     35         const SkPMColor* lp = src;
     36         const SkPMColor* up = upperSrc;
     37         SkPMColor* dptr = dst;
     38         for (int y = 0; y < height; ++y) {
     39             __m128i max = type == kDilate ? _mm_setzero_si128() : _mm_set1_epi32(0xFFFFFFFF);
     40             for (const SkPMColor* p = lp; p <= up; p += srcStrideX) {
     41                 __m128i src_pixel = _mm_cvtsi32_si128(*p);
     42                 max = type == kDilate ? _mm_max_epu8(src_pixel, max) : _mm_min_epu8(src_pixel, max);
     43             }
     44             *dptr = _mm_cvtsi128_si32(max);
     45             dptr += dstStrideY;
     46             lp += srcStrideY;
     47             up += srcStrideY;
     48         }
     49         if (x >= radius) {
     50             src += srcStrideX;
     51         }
     52         if (x + radius < width - 1) {
     53             upperSrc += srcStrideX;
     54         }
     55         dst += dstStrideX;
     56     }
     57 }
     58 
     59 void SkDilateX_SSE2(const SkPMColor* src, SkPMColor* dst, int radius,
     60                     int width, int height, int srcStride, int dstStride)
     61 {
     62     SkMorph_SSE2<kDilate, kX>(src, dst, radius, width, height, srcStride, dstStride);
     63 }
     64 
     65 void SkErodeX_SSE2(const SkPMColor* src, SkPMColor* dst, int radius,
     66                    int width, int height, int srcStride, int dstStride)
     67 {
     68     SkMorph_SSE2<kErode, kX>(src, dst, radius, width, height, srcStride, dstStride);
     69 }
     70 
     71 void SkDilateY_SSE2(const SkPMColor* src, SkPMColor* dst, int radius,
     72                     int width, int height, int srcStride, int dstStride)
     73 {
     74     SkMorph_SSE2<kDilate, kY>(src, dst, radius, width, height, srcStride, dstStride);
     75 }
     76 
     77 void SkErodeY_SSE2(const SkPMColor* src, SkPMColor* dst, int radius,
     78                    int width, int height, int srcStride, int dstStride)
     79 {
     80     SkMorph_SSE2<kErode, kY>(src, dst, radius, width, height, srcStride, dstStride);
     81 }
     82