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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 "SkMatrixConvolutionImageFilter.h"
#include "SkBitmap.h"
#include "SkColorPriv.h"
#include "SkFlattenableBuffers.h"
#include "SkRect.h"
SkMatrixConvolutionImageFilter::SkMatrixConvolutionImageFilter(const SkISize& kernelSize, const SkScalar* kernel, SkScalar gain, SkScalar bias, const SkIPoint& target, TileMode tileMode, SkImageFilter* input)
: INHERITED(input),
fKernelSize(kernelSize),
fGain(gain),
fBias(bias),
fTarget(target),
fTileMode(tileMode) {
uint32_t size = fKernelSize.fWidth * fKernelSize.fHeight;
fKernel = SkNEW_ARRAY(SkScalar, size);
memcpy(fKernel, kernel, size * sizeof(SkScalar));
SkASSERT(target.fX >= 0 && target.fX < kernelSize.fWidth);
SkASSERT(target.fY >= 0 && target.fY < kernelSize.fHeight);
}
SkMatrixConvolutionImageFilter::SkMatrixConvolutionImageFilter(SkFlattenableReadBuffer& buffer) : INHERITED(buffer) {
fKernelSize.fWidth = buffer.readInt();
fKernelSize.fHeight = buffer.readInt();
uint32_t size = fKernelSize.fWidth * fKernelSize.fHeight;
fKernel = SkNEW_ARRAY(SkScalar, size);
uint32_t readSize = buffer.readScalarArray(fKernel);
SkASSERT(readSize == size);
fGain = buffer.readScalar();
fBias = buffer.readScalar();
fTarget.fX = buffer.readScalar();
fTarget.fY = buffer.readScalar();
fTileMode = (TileMode) buffer.readInt();
}
void SkMatrixConvolutionImageFilter::flatten(SkFlattenableWriteBuffer& buffer) const {
this->INHERITED::flatten(buffer);
buffer.writeInt(fKernelSize.fWidth);
buffer.writeInt(fKernelSize.fHeight);
buffer.writeScalarArray(fKernel, fKernelSize.fWidth * fKernelSize.fHeight);
buffer.writeScalar(fGain);
buffer.writeScalar(fBias);
buffer.writeScalar(fTarget.fX);
buffer.writeScalar(fTarget.fY);
buffer.writeInt((int) fTileMode);
}
SkMatrixConvolutionImageFilter::~SkMatrixConvolutionImageFilter() {
delete[] fKernel;
}
class UncheckedPixelFetcher {
public:
static inline SkPMColor fetch(const SkBitmap& src, int x, int y) {
return *src.getAddr32(x, y);
}
};
class ClampPixelFetcher {
public:
static inline SkPMColor fetch(const SkBitmap& src, int x, int y) {
x = SkClampMax(x, src.width() - 1);
y = SkClampMax(y, src.height() - 1);
return *src.getAddr32(x, y);
}
};
class RepeatPixelFetcher {
public:
static inline SkPMColor fetch(const SkBitmap& src, int x, int y) {
x %= src.width();
y %= src.height();
if (x < 0) {
x += src.width();
}
if (y < 0) {
y += src.height();
}
return *src.getAddr32(x, y);
}
};
class ClampToBlackPixelFetcher {
public:
static inline SkPMColor fetch(const SkBitmap& src, int x, int y) {
if (x < 0 || x >= src.width() || y < 0 || y >= src.height()) {
return 0;
} else {
return *src.getAddr32(x, y);
}
}
};
template<class PixelFetcher>
void SkMatrixConvolutionImageFilter::filterPixels(const SkBitmap& src, SkBitmap* result, const SkIRect& rect) {
for (int y = rect.fTop; y < rect.fBottom; ++y) {
SkPMColor* dptr = result->getAddr32(rect.fLeft, y);
for (int x = rect.fLeft; x < rect.fRight; ++x) {
SkScalar sumA = 0, sumR = 0, sumG = 0, sumB = 0;
for (int cy = 0; cy < fKernelSize.fHeight; cy++) {
for (int cx = 0; cx < fKernelSize.fWidth; cx++) {
SkPMColor s = PixelFetcher::fetch(src, x + cx - fTarget.fX, y + cy - fTarget.fY);
SkScalar k = fKernel[cy * fKernelSize.fWidth + cx];
sumA += SkScalarMul(SkIntToScalar(SkGetPackedA32(s)), k);
sumR += SkScalarMul(SkIntToScalar(SkGetPackedR32(s)), k);
sumG += SkScalarMul(SkIntToScalar(SkGetPackedG32(s)), k);
sumB += SkScalarMul(SkIntToScalar(SkGetPackedB32(s)), k);
}
}
int a = SkScalarFloorToInt(SkScalarMul(sumA, fGain) + fBias);
int r = SkScalarFloorToInt(SkScalarMul(sumR, fGain) + fBias);
int g = SkScalarFloorToInt(SkScalarMul(sumG, fGain) + fBias);
int b = SkScalarFloorToInt(SkScalarMul(sumB, fGain) + fBias);
*dptr++ = SkPackARGB32(SkClampMax(a, 255),
SkClampMax(r, 255),
SkClampMax(g, 255),
SkClampMax(b, 255));
}
}
}
void SkMatrixConvolutionImageFilter::filterInteriorPixels(const SkBitmap& src, SkBitmap* result, const SkIRect& rect) {
filterPixels<UncheckedPixelFetcher>(src, result, rect);
}
void SkMatrixConvolutionImageFilter::filterBorderPixels(const SkBitmap& src, SkBitmap* result, const SkIRect& rect) {
switch (fTileMode) {
case kClamp_TileMode:
filterPixels<ClampPixelFetcher>(src, result, rect);
break;
case kRepeat_TileMode:
filterPixels<RepeatPixelFetcher>(src, result, rect);
break;
case kClampToBlack_TileMode:
filterPixels<ClampToBlackPixelFetcher>(src, result, rect);
break;
}
}
bool SkMatrixConvolutionImageFilter::onFilterImage(Proxy* proxy,
const SkBitmap& source,
const SkMatrix& matrix,
SkBitmap* result,
SkIPoint* loc) {
SkBitmap src = this->getInputResult(proxy, source, matrix, loc);
if (src.config() != SkBitmap::kARGB_8888_Config) {
return false;
}
SkAutoLockPixels alp(src);
if (!src.getPixels()) {
return false;
}
result->setConfig(src.config(), src.width(), src.height());
result->allocPixels();
SkIRect interior = SkIRect::MakeXYWH(fTarget.fX, fTarget.fY,
src.width() - fKernelSize.fWidth + 1,
src.height() - fKernelSize.fHeight + 1);
SkIRect top = SkIRect::MakeWH(src.width(), fTarget.fY);
SkIRect bottom = SkIRect::MakeLTRB(0, interior.bottom(),
src.width(), src.height());
SkIRect left = SkIRect::MakeXYWH(0, interior.top(),
fTarget.fX, interior.height());
SkIRect right = SkIRect::MakeLTRB(interior.right(), interior.top(),
src.width(), interior.bottom());
filterBorderPixels(src, result, top);
filterBorderPixels(src, result, left);
filterInteriorPixels(src, result, interior);
filterBorderPixels(src, result, right);
filterBorderPixels(src, result, bottom);
return true;
}
SK_DEFINE_FLATTENABLE_REGISTRAR(SkMatrixConvolutionImageFilter)
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