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/*
* Copyright 2016 Google Inc.
*
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file
*/
#include "src/core/SkSpecialImage.h"
#include "include/core/SkBitmap.h"
#include "include/core/SkCanvas.h"
#include "include/core/SkColorType.h"
#include "include/core/SkImage.h"
#include "include/core/SkMatrix.h"
#include "include/core/SkShader.h"
#include "include/core/SkTileMode.h"
#include "include/private/base/SkAssert.h"
#include "src/core/SkNextID.h"
#include "src/image/SkImage_Base.h"
// Currently, the raster imagefilters can only handle certain imageinfos. Call this to know if
// a given info is supported.
static bool valid_for_imagefilters(const SkImageInfo& info) {
// no support for other swizzles/depths yet
return info.colorType() == kN32_SkColorType;
}
SkSpecialImage::SkSpecialImage(const SkIRect& subset,
uint32_t uniqueID,
const SkColorInfo& colorInfo,
const SkSurfaceProps& props)
: fSubset(subset)
, fUniqueID(kNeedNewImageUniqueID_SpecialImage == uniqueID ? SkNextID::ImageID() : uniqueID)
, fColorInfo(colorInfo)
, fProps(props) {
}
void SkSpecialImage::draw(SkCanvas* canvas,
SkScalar x, SkScalar y,
const SkSamplingOptions& sampling,
const SkPaint* paint, bool strict) const {
SkRect dst = SkRect::MakeXYWH(x, y, this->subset().width(), this->subset().height());
canvas->drawImageRect(this->asImage(), SkRect::Make(this->subset()), dst,
sampling, paint, strict ? SkCanvas::kStrict_SrcRectConstraint
: SkCanvas::kFast_SrcRectConstraint);
}
sk_sp<SkImage> SkSpecialImage::asImage(const SkIRect* subset) const {
if (subset) {
SkIRect absolute = subset->makeOffset(this->subset().topLeft());
return this->onAsImage(&absolute);
} else {
return this->onAsImage(nullptr);
}
}
sk_sp<SkShader> SkSpecialImage::asShader(SkTileMode tileMode,
const SkSamplingOptions& sampling,
const SkMatrix& lm) const {
return this->onAsShader(tileMode, sampling, lm);
}
sk_sp<SkShader> SkSpecialImage::asShader(const SkSamplingOptions& sampling) const {
return this->asShader(sampling, SkMatrix::I());
}
sk_sp<SkShader> SkSpecialImage::asShader(const SkSamplingOptions& sampling,
const SkMatrix& lm) const {
return this->asShader(SkTileMode::kClamp, sampling, lm);
}
class SkSpecialImage_Raster final : public SkSpecialImage {
public:
SkSpecialImage_Raster(const SkIRect& subset, const SkBitmap& bm, const SkSurfaceProps& props)
: SkSpecialImage(subset, bm.getGenerationID(), bm.info().colorInfo(), props)
, fBitmap(bm) {
SkASSERT(bm.pixelRef());
SkASSERT(fBitmap.getPixels());
}
bool getROPixels(SkBitmap* bm) const {
return fBitmap.extractSubset(bm, this->subset());
}
size_t getSize() const override { return fBitmap.computeByteSize(); }
sk_sp<SkSpecialImage> onMakeSubset(const SkIRect& subset) const override {
// No need to extract subset, onGetROPixels handles that when needed
return SkSpecialImages::MakeFromRaster(subset, fBitmap, this->props());
}
sk_sp<SkImage> onAsImage(const SkIRect* subset) const override {
if (subset) {
SkBitmap subsetBM;
if (!fBitmap.extractSubset(&subsetBM, *subset)) {
return nullptr;
}
return subsetBM.asImage();
}
return fBitmap.asImage();
}
sk_sp<SkShader> onAsShader(SkTileMode tileMode,
const SkSamplingOptions& sampling,
const SkMatrix& lm) const override {
// TODO(skbug.com/12784): SkImage::makeShader() doesn't support a subset yet, but SkBitmap
// supports subset views so create the shader from the subset bitmap instead of fBitmap.
SkBitmap subsetBM;
if (!this->getROPixels(&subsetBM)) {
return nullptr;
}
return subsetBM.asImage()->makeShader(tileMode, tileMode, sampling, lm);
}
private:
SkBitmap fBitmap;
};
namespace SkSpecialImages {
sk_sp<SkSpecialImage> MakeFromRaster(const SkIRect& subset,
const SkBitmap& bm,
const SkSurfaceProps& props) {
SkASSERT(bm.bounds().contains(subset));
if (!bm.pixelRef()) {
return nullptr;
}
const SkBitmap* srcBM = &bm;
SkBitmap tmp;
// ImageFilters only handle N32 at the moment, so force our src to be that
if (!valid_for_imagefilters(bm.info())) {
if (!tmp.tryAllocPixels(bm.info().makeColorType(kN32_SkColorType)) ||
!bm.readPixels(tmp.info(), tmp.getPixels(), tmp.rowBytes(), 0, 0))
{
return nullptr;
}
srcBM = &tmp;
}
return sk_make_sp<SkSpecialImage_Raster>(subset, *srcBM, props);
}
sk_sp<SkSpecialImage> CopyFromRaster(const SkIRect& subset,
const SkBitmap& bm,
const SkSurfaceProps& props) {
SkASSERT(bm.bounds().contains(subset));
if (!bm.pixelRef()) {
return nullptr;
}
SkBitmap tmp;
SkImageInfo info = bm.info().makeDimensions(subset.size());
// As in MakeFromRaster, must force src to N32 for ImageFilters
if (!valid_for_imagefilters(bm.info())) {
info = info.makeColorType(kN32_SkColorType);
}
if (!tmp.tryAllocPixels(info)) {
return nullptr;
}
if (!bm.readPixels(tmp.info(), tmp.getPixels(), tmp.rowBytes(), subset.x(), subset.y())) {
return nullptr;
}
// Since we're making a copy of the raster, the resulting special image is the exact size
// of the requested subset of the original and no longer needs to be offset by subset's left
// and top, since those were relative to the original's buffer.
return sk_make_sp<SkSpecialImage_Raster>(
SkIRect::MakeWH(subset.width(), subset.height()), tmp, props);
}
sk_sp<SkSpecialImage> MakeFromRaster(const SkIRect& subset,
sk_sp<SkImage> image,
const SkSurfaceProps& props) {
if (!image || subset.isEmpty()) {
return nullptr;
}
SkASSERT(image->bounds().contains(subset));
SkASSERT(!image->isTextureBacked());
// This will not work if the image is uploaded to a GPU render target.
SkBitmap bm;
if (as_IB(image)->getROPixels(nullptr, &bm)) {
return MakeFromRaster(subset, bm, props);
}
return nullptr;
}
bool AsBitmap(const SkSpecialImage* img, SkBitmap* result) {
if (!img || img->isGaneshBacked() || img->isGraphiteBacked()) {
return false;
}
auto rasterImg = static_cast<const SkSpecialImage_Raster*>(img);
return rasterImg->getROPixels(result);
}
} // namespace SkSpecialImages
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