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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 "SkImageFilter.h"
#include "SkBitmap.h"
#include "SkReadBuffer.h"
#include "SkWriteBuffer.h"
#include "SkRect.h"
#include "SkValidationUtils.h"
#if SK_SUPPORT_GPU
#include "GrContext.h"
#include "GrTexture.h"
#include "SkImageFilterUtils.h"
#endif
SkImageFilter::SkImageFilter(int inputCount, SkImageFilter** inputs, const CropRect* cropRect)
: fInputCount(inputCount),
fInputs(new SkImageFilter*[inputCount]),
fCropRect(cropRect ? *cropRect : CropRect(SkRect(), 0x0)) {
for (int i = 0; i < inputCount; ++i) {
fInputs[i] = inputs[i];
SkSafeRef(fInputs[i]);
}
}
SkImageFilter::SkImageFilter(SkImageFilter* input, const CropRect* cropRect)
: fInputCount(1),
fInputs(new SkImageFilter*[1]),
fCropRect(cropRect ? *cropRect : CropRect(SkRect(), 0x0)) {
fInputs[0] = input;
SkSafeRef(fInputs[0]);
}
SkImageFilter::SkImageFilter(SkImageFilter* input1, SkImageFilter* input2, const CropRect* cropRect)
: fInputCount(2), fInputs(new SkImageFilter*[2]),
fCropRect(cropRect ? *cropRect : CropRect(SkRect(), 0x0)) {
fInputs[0] = input1;
fInputs[1] = input2;
SkSafeRef(fInputs[0]);
SkSafeRef(fInputs[1]);
}
SkImageFilter::~SkImageFilter() {
for (int i = 0; i < fInputCount; i++) {
SkSafeUnref(fInputs[i]);
}
delete[] fInputs;
}
SkImageFilter::SkImageFilter(int inputCount, SkReadBuffer& buffer) {
fInputCount = buffer.readInt();
if (buffer.validate((fInputCount >= 0) && ((inputCount < 0) || (fInputCount == inputCount)))) {
fInputs = new SkImageFilter*[fInputCount];
for (int i = 0; i < fInputCount; i++) {
if (buffer.readBool()) {
fInputs[i] = buffer.readImageFilter();
} else {
fInputs[i] = NULL;
}
if (!buffer.isValid()) {
fInputCount = i; // Do not use fInputs past that point in the destructor
break;
}
}
SkRect rect;
buffer.readRect(&rect);
if (buffer.isValid() && buffer.validate(SkIsValidRect(rect))) {
uint32_t flags = buffer.readUInt();
fCropRect = CropRect(rect, flags);
}
} else {
fInputCount = 0;
fInputs = NULL;
}
}
void SkImageFilter::flatten(SkWriteBuffer& buffer) const {
buffer.writeInt(fInputCount);
for (int i = 0; i < fInputCount; i++) {
SkImageFilter* input = getInput(i);
buffer.writeBool(input != NULL);
if (input != NULL) {
buffer.writeFlattenable(input);
}
}
buffer.writeRect(fCropRect.rect());
buffer.writeUInt(fCropRect.flags());
}
bool SkImageFilter::filterImage(Proxy* proxy, const SkBitmap& src,
const SkMatrix& ctm,
SkBitmap* result, SkIPoint* offset) {
SkASSERT(result);
SkASSERT(offset);
/*
* Give the proxy first shot at the filter. If it returns false, ask
* the filter to do it.
*/
return (proxy && proxy->filterImage(this, src, ctm, result, offset)) ||
this->onFilterImage(proxy, src, ctm, result, offset);
}
bool SkImageFilter::filterBounds(const SkIRect& src, const SkMatrix& ctm,
SkIRect* dst) const {
SkASSERT(&src);
SkASSERT(dst);
return this->onFilterBounds(src, ctm, dst);
}
void SkImageFilter::computeFastBounds(const SkRect& src, SkRect* dst) const {
if (0 == fInputCount) {
*dst = src;
return;
}
if (this->getInput(0)) {
this->getInput(0)->computeFastBounds(src, dst);
} else {
*dst = src;
}
for (int i = 1; i < fInputCount; i++) {
SkImageFilter* input = this->getInput(i);
if (input) {
SkRect bounds;
input->computeFastBounds(src, &bounds);
dst->join(bounds);
} else {
dst->join(src);
}
}
}
bool SkImageFilter::onFilterImage(Proxy*, const SkBitmap&, const SkMatrix&,
SkBitmap*, SkIPoint*) {
return false;
}
bool SkImageFilter::canFilterImageGPU() const {
return this->asNewEffect(NULL, NULL, SkMatrix::I(), SkIRect());
}
bool SkImageFilter::filterImageGPU(Proxy* proxy, const SkBitmap& src, const SkMatrix& ctm,
SkBitmap* result, SkIPoint* offset) {
#if SK_SUPPORT_GPU
SkBitmap input;
SkASSERT(fInputCount == 1);
SkIPoint srcOffset = SkIPoint::Make(0, 0);
if (!SkImageFilterUtils::GetInputResultGPU(this->getInput(0), proxy, src, ctm, &input, &srcOffset)) {
return false;
}
GrTexture* srcTexture = input.getTexture();
SkIRect bounds;
src.getBounds(&bounds);
bounds.offset(srcOffset);
if (!this->applyCropRect(&bounds, ctm)) {
return false;
}
SkRect srcRect = SkRect::Make(bounds);
SkRect dstRect = SkRect::MakeWH(srcRect.width(), srcRect.height());
GrContext* context = srcTexture->getContext();
GrTextureDesc desc;
desc.fFlags = kRenderTarget_GrTextureFlagBit,
desc.fWidth = bounds.width();
desc.fHeight = bounds.height();
desc.fConfig = kRGBA_8888_GrPixelConfig;
GrAutoScratchTexture dst(context, desc);
GrContext::AutoMatrix am;
am.setIdentity(context);
GrContext::AutoRenderTarget art(context, dst.texture()->asRenderTarget());
GrContext::AutoClip acs(context, dstRect);
GrEffectRef* effect;
offset->fX = bounds.left();
offset->fY = bounds.top();
bounds.offset(-srcOffset);
SkMatrix matrix(ctm);
matrix.postTranslate(SkIntToScalar(-bounds.left()), SkIntToScalar(-bounds.top()));
this->asNewEffect(&effect, srcTexture, matrix, bounds);
SkASSERT(effect);
SkAutoUnref effectRef(effect);
GrPaint paint;
paint.addColorEffect(effect);
context->drawRectToRect(paint, dstRect, srcRect);
SkAutoTUnref<GrTexture> resultTex(dst.detach());
SkImageFilterUtils::WrapTexture(resultTex, bounds.width(), bounds.height(), result);
return true;
#else
return false;
#endif
}
bool SkImageFilter::applyCropRect(SkIRect* rect, const SkMatrix& matrix) const {
SkRect cropRect;
matrix.mapRect(&cropRect, fCropRect.rect());
SkIRect cropRectI;
cropRect.roundOut(&cropRectI);
uint32_t flags = fCropRect.flags();
// If the original crop rect edges were unset, max out the new crop edges
if (!(flags & CropRect::kHasLeft_CropEdge)) cropRectI.fLeft = SK_MinS32;
if (!(flags & CropRect::kHasTop_CropEdge)) cropRectI.fTop = SK_MinS32;
if (!(flags & CropRect::kHasRight_CropEdge)) cropRectI.fRight = SK_MaxS32;
if (!(flags & CropRect::kHasBottom_CropEdge)) cropRectI.fBottom = SK_MaxS32;
return rect->intersect(cropRectI);
}
bool SkImageFilter::onFilterBounds(const SkIRect& src, const SkMatrix& ctm,
SkIRect* dst) const {
if (fInputCount < 1) {
return false;
}
SkIRect bounds;
for (int i = 0; i < fInputCount; ++i) {
SkImageFilter* filter = this->getInput(i);
SkIRect rect = src;
if (filter && !filter->filterBounds(src, ctm, &rect)) {
return false;
}
if (0 == i) {
bounds = rect;
} else {
bounds.join(rect);
}
}
// don't modify dst until now, so we don't accidentally change it in the
// loop, but then return false on the next filter.
*dst = bounds;
return true;
}
bool SkImageFilter::asNewEffect(GrEffectRef**, GrTexture*, const SkMatrix&, const SkIRect&) const {
return false;
}
bool SkImageFilter::asColorFilter(SkColorFilter**) const {
return false;
}
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