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/*
* Copyright 2013 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 "SkColorPriv.h"
#include "SkMorphology_opts.h"
#include "SkMorphology_opts_neon.h"
#include <arm_neon.h>
/* neon version of dilateX, dilateY, erodeX, erodeY.
* portable versions are in src/effects/SkMorphologyImageFilter.cpp.
*/
enum MorphType {
kDilate, kErode
};
enum MorphDirection {
kX, kY
};
template<MorphType type, MorphDirection direction>
static void SkMorph_neon(const SkPMColor* src, SkPMColor* dst, int radius,
int width, int height, int srcStride, int dstStride)
{
const int srcStrideX = direction == kX ? 1 : srcStride;
const int dstStrideX = direction == kX ? 1 : dstStride;
const int srcStrideY = direction == kX ? srcStride : 1;
const int dstStrideY = direction == kX ? dstStride : 1;
radius = SkMin32(radius, width - 1);
const SkPMColor* upperSrc = src + radius * srcStrideX;
for (int x = 0; x < width; ++x) {
const SkPMColor* lp = src;
const SkPMColor* up = upperSrc;
SkPMColor* dptr = dst;
for (int y = 0; y < height; ++y) {
uint8x8_t max = vdup_n_u8(type == kDilate ? 0 : 255);
for (const SkPMColor* p = lp; p <= up; p += srcStrideX) {
uint8x8_t src_pixel = vreinterpret_u8_u32(vdup_n_u32(*p));
max = type == kDilate ? vmax_u8(src_pixel, max) : vmin_u8(src_pixel, max);
}
*dptr = vget_lane_u32(vreinterpret_u32_u8(max), 0);
dptr += dstStrideY;
lp += srcStrideY;
up += srcStrideY;
}
if (x >= radius) src += srcStrideX;
if (x + radius < width - 1) upperSrc += srcStrideX;
dst += dstStrideX;
}
}
void SkDilateX_neon(const SkPMColor* src, SkPMColor* dst, int radius,
int width, int height, int srcStride, int dstStride)
{
SkMorph_neon<kDilate, kX>(src, dst, radius, width, height, srcStride, dstStride);
}
void SkErodeX_neon(const SkPMColor* src, SkPMColor* dst, int radius,
int width, int height, int srcStride, int dstStride)
{
SkMorph_neon<kErode, kX>(src, dst, radius, width, height, srcStride, dstStride);
}
void SkDilateY_neon(const SkPMColor* src, SkPMColor* dst, int radius,
int width, int height, int srcStride, int dstStride)
{
SkMorph_neon<kDilate, kY>(src, dst, radius, width, height, srcStride, dstStride);
}
void SkErodeY_neon(const SkPMColor* src, SkPMColor* dst, int radius,
int width, int height, int srcStride, int dstStride)
{
SkMorph_neon<kErode, kY>(src, dst, radius, width, height, srcStride, dstStride);
}
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