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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 
      9 #include "SkColorPriv.h"
     10 #include "SkMorphology_opts.h"
     11 #include "SkMorphology_opts_neon.h"
     12 
     13 #include <arm_neon.h>
     14 
     15 /* neon version of dilateX, dilateY, erodeX, erodeY.
     16  * portable versions are in src/effects/SkMorphologyImageFilter.cpp.
     17  */
     18 
     19 enum MorphType {
     20     kDilate, kErode
     21 };
     22 
     23 enum MorphDirection {
     24     kX, kY
     25 };
     26 
     27 template<MorphType type, MorphDirection direction>
     28 static void SkMorph_neon(const SkPMColor* src, SkPMColor* dst, int radius,
     29                          int width, int height, int srcStride, int dstStride)
     30 {
     31     const int srcStrideX = direction == kX ? 1 : srcStride;
     32     const int dstStrideX = direction == kX ? 1 : dstStride;
     33     const int srcStrideY = direction == kX ? srcStride : 1;
     34     const int dstStrideY = direction == kX ? dstStride : 1;
     35     radius = SkMin32(radius, width - 1);
     36     const SkPMColor* upperSrc = src + radius * srcStrideX;
     37     for (int x = 0; x < width; ++x) {
     38         const SkPMColor* lp = src;
     39         const SkPMColor* up = upperSrc;
     40         SkPMColor* dptr = dst;
     41         for (int y = 0; y < height; ++y) {
     42             uint8x8_t max = vdup_n_u8(type == kDilate ? 0 : 255);
     43             for (const SkPMColor* p = lp; p <= up; p += srcStrideX) {
     44                 uint8x8_t src_pixel = vreinterpret_u8_u32(vdup_n_u32(*p));
     45                 max = type == kDilate ? vmax_u8(src_pixel, max) : vmin_u8(src_pixel, max);
     46             }
     47             *dptr = vget_lane_u32(vreinterpret_u32_u8(max), 0);
     48             dptr += dstStrideY;
     49             lp += srcStrideY;
     50             up += srcStrideY;
     51         }
     52         if (x >= radius) src += srcStrideX;
     53         if (x + radius < width - 1) upperSrc += srcStrideX;
     54         dst += dstStrideX;
     55     }
     56 }
     57 
     58 void SkDilateX_neon(const SkPMColor* src, SkPMColor* dst, int radius,
     59                     int width, int height, int srcStride, int dstStride)
     60 {
     61     SkMorph_neon<kDilate, kX>(src, dst, radius, width, height, srcStride, dstStride);
     62 }
     63 
     64 void SkErodeX_neon(const SkPMColor* src, SkPMColor* dst, int radius,
     65                    int width, int height, int srcStride, int dstStride)
     66 {
     67     SkMorph_neon<kErode, kX>(src, dst, radius, width, height, srcStride, dstStride);
     68 }
     69 
     70 void SkDilateY_neon(const SkPMColor* src, SkPMColor* dst, int radius,
     71                     int width, int height, int srcStride, int dstStride)
     72 {
     73     SkMorph_neon<kDilate, kY>(src, dst, radius, width, height, srcStride, dstStride);
     74 }
     75 
     76 void SkErodeY_neon(const SkPMColor* src, SkPMColor* dst, int radius,
     77                    int width, int height, int srcStride, int dstStride)
     78 {
     79     SkMorph_neon<kErode, kY>(src, dst, radius, width, height, srcStride, dstStride);
     80 }
     81