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/*
* Copyright 2015 Google Inc.
*
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/
#include "SkImage_Base.h"
#include "SkBitmap.h"
#include "SkCanvas.h"
#include "SkData.h"
#include "SkImageCacherator.h"
#include "SkImagePriv.h"
#include "SkPixelRef.h"
#include "SkSurface.h"
class SkImage_Generator : public SkImage_Base {
public:
SkImage_Generator(SkImageCacherator* cache)
: INHERITED(cache->info().width(), cache->info().height(), cache->uniqueID())
, fCache(cache) // take ownership
{}
virtual SkImageInfo onImageInfo() const override {
return fCache->info();
}
bool onReadPixels(const SkImageInfo&, void*, size_t, int srcX, int srcY, CachingHint) const override;
SkImageCacherator* peekCacherator() const override { return fCache; }
SkData* onRefEncoded(GrContext*) const override;
bool isOpaque() const override { return fCache->info().isOpaque(); }
sk_sp<SkImage> onMakeSubset(const SkIRect&) const override;
bool getROPixels(SkBitmap*, CachingHint) const override;
GrTexture* asTextureRef(GrContext*, const GrTextureParams&) const override;
bool onIsLazyGenerated() const override { return true; }
private:
SkAutoTDelete<SkImageCacherator> fCache;
typedef SkImage_Base INHERITED;
};
///////////////////////////////////////////////////////////////////////////////
bool SkImage_Generator::onReadPixels(const SkImageInfo& dstInfo, void* dstPixels, size_t dstRB,
int srcX, int srcY, CachingHint chint) const {
SkBitmap bm;
if (kDisallow_CachingHint == chint) {
if (fCache->lockAsBitmapOnlyIfAlreadyCached(&bm)) {
return bm.readPixels(dstInfo, dstPixels, dstRB, srcX, srcY);
} else {
// Try passing the caller's buffer directly down to the generator. If this fails we
// may still succeed in the general case, as the generator may prefer some other
// config, which we could then convert via SkBitmap::readPixels.
if (fCache->directGeneratePixels(dstInfo, dstPixels, dstRB, srcX, srcY)) {
return true;
}
// else fall through
}
}
if (this->getROPixels(&bm, chint)) {
return bm.readPixels(dstInfo, dstPixels, dstRB, srcX, srcY);
}
return false;
}
SkData* SkImage_Generator::onRefEncoded(GrContext* ctx) const {
return fCache->refEncoded(ctx);
}
bool SkImage_Generator::getROPixels(SkBitmap* bitmap, CachingHint chint) const {
return fCache->lockAsBitmap(bitmap, this, chint);
}
GrTexture* SkImage_Generator::asTextureRef(GrContext* ctx, const GrTextureParams& params) const {
return fCache->lockAsTexture(ctx, params, this);
}
sk_sp<SkImage> SkImage_Generator::onMakeSubset(const SkIRect& subset) const {
// TODO: make this lazy, by wrapping the subset inside a new generator or something
// For now, we do effectively what we did before, make it a raster
const SkImageInfo info = SkImageInfo::MakeN32(subset.width(), subset.height(),
this->isOpaque() ? kOpaque_SkAlphaType : kPremul_SkAlphaType);
auto surface(SkSurface::MakeRaster(info));
if (!surface) {
return nullptr;
}
surface->getCanvas()->clear(0);
surface->getCanvas()->drawImage(this, SkIntToScalar(-subset.x()), SkIntToScalar(-subset.y()),
nullptr);
return surface->makeImageSnapshot();
}
sk_sp<SkImage> SkImage::MakeFromGenerator(SkImageGenerator* generator, const SkIRect* subset) {
if (!generator) {
return nullptr;
}
SkImageCacherator* cache = SkImageCacherator::NewFromGenerator(generator, subset);
if (!cache) {
return nullptr;
}
return sk_make_sp<SkImage_Generator>(cache);
}
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