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
19enum MorphType {
20    kDilate, kErode
21};
22
23enum MorphDirection {
24    kX, kY
25};
26
27template<MorphType type, MorphDirection direction>
28static 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
58void 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
64void 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
70void 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
76void 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