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/*
* Copyright 2011 Google Inc.
*
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/
#include "SkKernel33MaskFilter.h"
#include "SkColorPriv.h"
#include "SkFlattenableBuffers.h"
SkMask::Format SkKernel33ProcMaskFilter::getFormat() const {
return SkMask::kA8_Format;
}
bool SkKernel33ProcMaskFilter::filterMask(SkMask* dst, const SkMask& src,
const SkMatrix&, SkIPoint* margin) const {
// margin???
dst->fImage = NULL;
dst->fBounds = src.fBounds;
dst->fBounds.inset(-1, -1);
dst->fFormat = SkMask::kA8_Format;
if (NULL == src.fImage) {
return true;
}
dst->fRowBytes = dst->fBounds.width();
size_t size = dst->computeImageSize();
if (0 == size) {
return false; // too big to allocate, abort
}
dst->fImage = SkMask::AllocImage(size);
const int h = src.fBounds.height();
const int w = src.fBounds.width();
const int srcRB = src.fRowBytes;
const uint8_t* srcImage = src.fImage;
uint8_t* dstImage = dst->fImage;
uint8_t* srcRows[3];
uint8_t storage[3][3];
srcRows[0] = storage[0];
srcRows[1] = storage[1];
srcRows[2] = storage[2];
unsigned scale = fPercent256;
for (int y = -1; y <= h; y++) {
uint8_t* dstRow = dstImage;
for (int x = -1; x <= w; x++) {
memset(storage, 0, sizeof(storage));
uint8_t* storagePtr = &storage[0][0];
for (int ky = y - 1; ky <= y + 1; ky++) {
const uint8_t* srcRow = srcImage + ky * srcRB; // may be out-of-range
for (int kx = x - 1; kx <= x + 1; kx++) {
if ((unsigned)ky < (unsigned)h && (unsigned)kx < (unsigned)w) {
*storagePtr = srcRow[kx];
}
storagePtr++;
}
}
int value = this->computeValue(srcRows);
if (scale < 256) {
value = SkAlphaBlend(value, srcRows[1][1], scale);
}
*dstRow++ = SkToU8(value);
}
dstImage += dst->fRowBytes;
}
return true;
}
void SkKernel33ProcMaskFilter::flatten(SkFlattenableWriteBuffer& wb) const {
this->INHERITED::flatten(wb);
wb.writeInt(fPercent256);
}
SkKernel33ProcMaskFilter::SkKernel33ProcMaskFilter(SkFlattenableReadBuffer& rb)
: SkMaskFilter(rb) {
fPercent256 = rb.readInt();
}
///////////////////////////////////////////////////////////////////////////////
uint8_t SkKernel33MaskFilter::computeValue(uint8_t* const* srcRows) const {
int value = 0;
for (int i = 0; i < 3; i++) {
for (int j = 0; j < 3; j++) {
value += fKernel[i][j] * srcRows[i][j];
}
}
value >>= fShift;
if (value < 0) {
value = 0;
} else if (value > 255) {
value = 255;
}
return (uint8_t)value;
}
void SkKernel33MaskFilter::flatten(SkFlattenableWriteBuffer& wb) const {
this->INHERITED::flatten(wb);
wb.writeIntArray(&fKernel[0][0], 9);
wb.writeInt(fShift);
}
SkKernel33MaskFilter::SkKernel33MaskFilter(SkFlattenableReadBuffer& rb)
: SkKernel33ProcMaskFilter(rb) {
SkDEBUGCODE(const uint32_t count = )rb.readIntArray(&fKernel[0][0]);
SkASSERT(9 == count);
fShift = rb.readInt();
}
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