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/*
* Copyright 2012 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 "SkMorphologyImageFilter.h"
#include "SkBitmap.h"
#include "SkColorPriv.h"
SkMorphologyImageFilter::SkMorphologyImageFilter(SkFlattenableReadBuffer& buffer)
: INHERITED(buffer) {
fRadius.fWidth = buffer.readInt();
fRadius.fHeight = buffer.readInt();
}
SkMorphologyImageFilter::SkMorphologyImageFilter(int radiusX, int radiusY)
: fRadius(SkISize::Make(radiusX, radiusY)) {
}
void SkMorphologyImageFilter::flatten(SkFlattenableWriteBuffer& buffer) const {
this->INHERITED::flatten(buffer);
buffer.writeInt(fRadius.fWidth);
buffer.writeInt(fRadius.fHeight);
}
static void erode(const SkPMColor* src, SkPMColor* dst,
int radius, int width, int height,
int srcStrideX, int srcStrideY,
int dstStrideX, int dstStrideY)
{
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) {
int minB = 255, minG = 255, minR = 255, minA = 255;
for (const SkPMColor* p = lp; p <= up; p += srcStrideX) {
int b = SkGetPackedB32(*p);
int g = SkGetPackedG32(*p);
int r = SkGetPackedR32(*p);
int a = SkGetPackedA32(*p);
if (b < minB) minB = b;
if (g < minG) minG = g;
if (r < minR) minR = r;
if (a < minA) minA = a;
}
*dptr = SkPackARGB32(minA, minR, minG, minB);
dptr += dstStrideY;
lp += srcStrideY;
up += srcStrideY;
}
if (x >= radius) src += srcStrideX;
if (x + radius < width - 1) upperSrc += srcStrideX;
dst += dstStrideX;
}
}
static void erodeX(const SkBitmap& src, SkBitmap* dst, int radiusX)
{
erode(src.getAddr32(0, 0), dst->getAddr32(0, 0),
radiusX, src.width(), src.height(),
1, src.rowBytesAsPixels(), 1, dst->rowBytesAsPixels());
}
static void erodeY(const SkBitmap& src, SkBitmap* dst, int radiusY)
{
erode(src.getAddr32(0, 0), dst->getAddr32(0, 0),
radiusY, src.height(), src.width(),
src.rowBytesAsPixels(), 1, dst->rowBytesAsPixels(), 1);
}
static void dilate(const SkPMColor* src, SkPMColor* dst,
int radius, int width, int height,
int srcStrideX, int srcStrideY,
int dstStrideX, int dstStrideY)
{
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) {
int maxB = 0, maxG = 0, maxR = 0, maxA = 0;
for (const SkPMColor* p = lp; p <= up; p += srcStrideX) {
int b = SkGetPackedB32(*p);
int g = SkGetPackedG32(*p);
int r = SkGetPackedR32(*p);
int a = SkGetPackedA32(*p);
if (b > maxB) maxB = b;
if (g > maxG) maxG = g;
if (r > maxR) maxR = r;
if (a > maxA) maxA = a;
}
*dptr = SkPackARGB32(maxA, maxR, maxG, maxB);
dptr += dstStrideY;
lp += srcStrideY;
up += srcStrideY;
}
if (x >= radius) src += srcStrideX;
if (x + radius < width - 1) upperSrc += srcStrideX;
dst += dstStrideX;
}
}
static void dilateX(const SkBitmap& src, SkBitmap* dst, int radiusX)
{
dilate(src.getAddr32(0, 0), dst->getAddr32(0, 0),
radiusX, src.width(), src.height(),
1, src.rowBytesAsPixels(), 1, dst->rowBytesAsPixels());
}
static void dilateY(const SkBitmap& src, SkBitmap* dst, int radiusY)
{
dilate(src.getAddr32(0, 0), dst->getAddr32(0, 0),
radiusY, src.height(), src.width(),
src.rowBytesAsPixels(), 1, dst->rowBytesAsPixels(), 1);
}
bool SkErodeImageFilter::onFilterImage(Proxy*,
const SkBitmap& src, const SkMatrix&,
SkBitmap* dst, SkIPoint*) {
if (src.config() != SkBitmap::kARGB_8888_Config) {
return false;
}
SkAutoLockPixels alp(src);
if (!src.getPixels()) {
return false;
}
dst->setConfig(src.config(), src.width(), src.height());
dst->allocPixels();
int width = radius().width();
int height = radius().height();
if (width < 0 || height < 0) {
return false;
}
if (width == 0 && height == 0) {
src.copyTo(dst, dst->config());
return true;
}
SkBitmap temp;
temp.setConfig(dst->config(), dst->width(), dst->height());
if (!temp.allocPixels()) {
return false;
}
if (width > 0 && height > 0) {
erodeX(src, &temp, width);
erodeY(temp, dst, height);
} else if (width > 0) {
erodeX(src, dst, width);
} else if (height > 0) {
erodeY(src, dst, height);
}
return true;
}
bool SkDilateImageFilter::onFilterImage(Proxy*,
const SkBitmap& src, const SkMatrix&,
SkBitmap* dst, SkIPoint*) {
if (src.config() != SkBitmap::kARGB_8888_Config) {
return false;
}
SkAutoLockPixels alp(src);
if (!src.getPixels()) {
return false;
}
dst->setConfig(src.config(), src.width(), src.height());
dst->allocPixels();
int width = radius().width();
int height = radius().height();
if (width < 0 || height < 0) {
return false;
}
if (width == 0 && height == 0) {
src.copyTo(dst, dst->config());
return true;
}
SkBitmap temp;
temp.setConfig(dst->config(), dst->width(), dst->height());
if (!temp.allocPixels()) {
return false;
}
if (width > 0 && height > 0) {
dilateX(src, &temp, width);
dilateY(temp, dst, height);
} else if (width > 0) {
dilateX(src, dst, width);
} else if (height > 0) {
dilateY(src, dst, height);
}
return true;
}
bool SkDilateImageFilter::asADilate(SkISize* radius) const {
*radius = this->radius();
return true;
}
bool SkErodeImageFilter::asAnErode(SkISize* radius) const {
*radius = this->radius();
return true;
}
SK_DEFINE_FLATTENABLE_REGISTRAR(SkDilateImageFilter)
SK_DEFINE_FLATTENABLE_REGISTRAR(SkErodeImageFilter)
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