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/*
* Copyright 2011 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 "SkBitmap.h"
#include "SkBlurImageFilter.h"
#include "SkColorPriv.h"
#include "SkFlattenableBuffers.h"
#if SK_SUPPORT_GPU
#include "GrContext.h"
#endif
SkBlurImageFilter::SkBlurImageFilter(SkFlattenableReadBuffer& buffer)
: INHERITED(buffer) {
fSigma.fWidth = buffer.readScalar();
fSigma.fHeight = buffer.readScalar();
}
SkBlurImageFilter::SkBlurImageFilter(SkScalar sigmaX, SkScalar sigmaY, SkImageFilter* input)
: INHERITED(input), fSigma(SkSize::Make(sigmaX, sigmaY)) {
SkASSERT(sigmaX >= 0 && sigmaY >= 0);
}
void SkBlurImageFilter::flatten(SkFlattenableWriteBuffer& buffer) const {
this->INHERITED::flatten(buffer);
buffer.writeScalar(fSigma.fWidth);
buffer.writeScalar(fSigma.fHeight);
}
static void boxBlurX(const SkBitmap& src, SkBitmap* dst, int kernelSize,
int leftOffset, int rightOffset)
{
int width = src.width(), height = src.height();
int rightBorder = SkMin32(rightOffset + 1, width);
for (int y = 0; y < height; ++y) {
int sumA = 0, sumR = 0, sumG = 0, sumB = 0;
SkPMColor* p = src.getAddr32(0, y);
for (int i = 0; i < rightBorder; ++i) {
sumA += SkGetPackedA32(*p);
sumR += SkGetPackedR32(*p);
sumG += SkGetPackedG32(*p);
sumB += SkGetPackedB32(*p);
p++;
}
const SkColor* sptr = src.getAddr32(0, y);
SkColor* dptr = dst->getAddr32(0, y);
for (int x = 0; x < width; ++x) {
*dptr = SkPackARGB32(sumA / kernelSize,
sumR / kernelSize,
sumG / kernelSize,
sumB / kernelSize);
if (x >= leftOffset) {
SkColor l = *(sptr - leftOffset);
sumA -= SkGetPackedA32(l);
sumR -= SkGetPackedR32(l);
sumG -= SkGetPackedG32(l);
sumB -= SkGetPackedB32(l);
}
if (x + rightOffset + 1 < width) {
SkColor r = *(sptr + rightOffset + 1);
sumA += SkGetPackedA32(r);
sumR += SkGetPackedR32(r);
sumG += SkGetPackedG32(r);
sumB += SkGetPackedB32(r);
}
sptr++;
dptr++;
}
}
}
static void boxBlurY(const SkBitmap& src, SkBitmap* dst, int kernelSize,
int topOffset, int bottomOffset)
{
int width = src.width(), height = src.height();
int bottomBorder = SkMin32(bottomOffset + 1, height);
int srcStride = src.rowBytesAsPixels();
int dstStride = dst->rowBytesAsPixels();
for (int x = 0; x < width; ++x) {
int sumA = 0, sumR = 0, sumG = 0, sumB = 0;
SkColor* p = src.getAddr32(x, 0);
for (int i = 0; i < bottomBorder; ++i) {
sumA += SkGetPackedA32(*p);
sumR += SkGetPackedR32(*p);
sumG += SkGetPackedG32(*p);
sumB += SkGetPackedB32(*p);
p += srcStride;
}
const SkColor* sptr = src.getAddr32(x, 0);
SkColor* dptr = dst->getAddr32(x, 0);
for (int y = 0; y < height; ++y) {
*dptr = SkPackARGB32(sumA / kernelSize,
sumR / kernelSize,
sumG / kernelSize,
sumB / kernelSize);
if (y >= topOffset) {
SkColor l = *(sptr - topOffset * srcStride);
sumA -= SkGetPackedA32(l);
sumR -= SkGetPackedR32(l);
sumG -= SkGetPackedG32(l);
sumB -= SkGetPackedB32(l);
}
if (y + bottomOffset + 1 < height) {
SkColor r = *(sptr + (bottomOffset + 1) * srcStride);
sumA += SkGetPackedA32(r);
sumR += SkGetPackedR32(r);
sumG += SkGetPackedG32(r);
sumB += SkGetPackedB32(r);
}
sptr += srcStride;
dptr += dstStride;
}
}
}
static void getBox3Params(SkScalar s, int *kernelSize, int* kernelSize3, int *lowOffset, int *highOffset)
{
float pi = SkScalarToFloat(SK_ScalarPI);
int d = static_cast<int>(floorf(SkScalarToFloat(s) * 3.0f * sqrtf(2.0f * pi) / 4.0f + 0.5f));
*kernelSize = d;
if (d % 2 == 1) {
*lowOffset = *highOffset = (d - 1) / 2;
*kernelSize3 = d;
} else {
*highOffset = d / 2;
*lowOffset = *highOffset - 1;
*kernelSize3 = d + 1;
}
}
bool SkBlurImageFilter::onFilterImage(Proxy* proxy,
const SkBitmap& source, const SkMatrix& ctm,
SkBitmap* dst, SkIPoint* offset) {
SkBitmap src = this->getInputResult(proxy, source, ctm, offset);
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 kernelSizeX, kernelSizeX3, lowOffsetX, highOffsetX;
int kernelSizeY, kernelSizeY3, lowOffsetY, highOffsetY;
getBox3Params(fSigma.width(), &kernelSizeX, &kernelSizeX3, &lowOffsetX, &highOffsetX);
getBox3Params(fSigma.height(), &kernelSizeY, &kernelSizeY3, &lowOffsetY, &highOffsetY);
if (kernelSizeX < 0 || kernelSizeY < 0) {
return false;
}
if (kernelSizeX == 0 && kernelSizeY == 0) {
src.copyTo(dst, dst->config());
return true;
}
SkBitmap temp;
temp.setConfig(dst->config(), dst->width(), dst->height());
if (!temp.allocPixels()) {
return false;
}
if (kernelSizeX > 0 && kernelSizeY > 0) {
boxBlurX(src, &temp, kernelSizeX, lowOffsetX, highOffsetX);
boxBlurY(temp, dst, kernelSizeY, lowOffsetY, highOffsetY);
boxBlurX(*dst, &temp, kernelSizeX, highOffsetX, lowOffsetX);
boxBlurY(temp, dst, kernelSizeY, highOffsetY, lowOffsetY);
boxBlurX(*dst, &temp, kernelSizeX3, highOffsetX, highOffsetX);
boxBlurY(temp, dst, kernelSizeY3, highOffsetY, highOffsetY);
} else if (kernelSizeX > 0) {
boxBlurX(src, dst, kernelSizeX, lowOffsetX, highOffsetX);
boxBlurX(*dst, &temp, kernelSizeX, highOffsetX, lowOffsetX);
boxBlurX(temp, dst, kernelSizeX3, highOffsetX, highOffsetX);
} else if (kernelSizeY > 0) {
boxBlurY(src, dst, kernelSizeY, lowOffsetY, highOffsetY);
boxBlurY(*dst, &temp, kernelSizeY, highOffsetY, lowOffsetY);
boxBlurY(temp, dst, kernelSizeY3, highOffsetY, highOffsetY);
}
return true;
}
GrTexture* SkBlurImageFilter::onFilterImageGPU(GrTexture* src, const SkRect& rect) {
#if SK_SUPPORT_GPU
SkAutoTUnref<GrTexture> input(this->getInputResultAsTexture(src, rect));
return src->getContext()->gaussianBlur(input.get(), false, rect,
fSigma.width(), fSigma.height());
#else
SkDEBUGFAIL("Should not call in GPU-less build");
return NULL;
#endif
}
SK_DEFINE_FLATTENABLE_REGISTRAR(SkBlurImageFilter)
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