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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 "SkImageGeneratorUtils.h"
#include "SkBitmap.h"
class GeneratorFromEmpty : public SkImageGenerator {
public:
GeneratorFromEmpty(const SkImageInfo& info) : SkImageGenerator(info) {}
};
SkImageGenerator* SkImageGeneratorUtils::NewEmpty(const SkImageInfo& info) {
return new GeneratorFromEmpty(info);
}
///////////////////////////////////////////////////////////////////////////////////////////////////
class GeneratorFromBitmap : public SkImageGenerator {
public:
GeneratorFromBitmap(const SkBitmap& bm) : SkImageGenerator(bm.info()), fBM(bm) {
if (!bm.isImmutable()) {
bm.copyTo(&fBM);
}
}
protected:
bool onGetPixels(const SkImageInfo& info, void* pixels, size_t rowBytes,
SkPMColor*, int*) override {
return fBM.readPixels(info, pixels, rowBytes, 0, 0);
}
private:
SkBitmap fBM;
};
SkImageGenerator* SkImageGeneratorUtils::NewFromBitmap(const SkBitmap& bm) {
return new GeneratorFromBitmap(bm);
}
///////////////////////////////////////////////////////////////////////////////////////////////////
#if SK_SUPPORT_GPU
#include "GrContext.h"
#include "GrTexture.h"
#include "SkGrPriv.h"
class GeneratorFromTexture : public SkImageGenerator {
public:
GeneratorFromTexture(GrContext* ctx, GrTexture* tex, const SkImageInfo& info)
: SkImageGenerator(info), fCtx(ctx), fTexture(tex)
{}
protected:
GrTexture* onGenerateTexture(GrContext* ctx, const SkIRect* subset) override {
if (ctx) {
SkASSERT(ctx == fCtx.get());
}
if (!subset) {
return SkRef(fTexture.get());
}
// need to copy the subset into a new texture
GrSurfaceDesc desc = fTexture->desc();
desc.fWidth = subset->width();
desc.fHeight = subset->height();
GrTexture* dst = fCtx->textureProvider()->createTexture(desc, false);
fCtx->copySurface(dst, fTexture, *subset, SkIPoint::Make(0, 0));
return dst;
}
private:
SkAutoTUnref<GrContext> fCtx;
SkAutoTUnref<GrTexture> fTexture;
};
#endif
SkImageGenerator* SkImageGeneratorUtils::NewFromTexture(GrContext* ctx, GrTexture* tex) {
#if SK_SUPPORT_GPU
if (ctx && tex) {
const GrSurfaceDesc desc = tex->desc();
SkColorType ct;
SkColorProfileType cpt;
if (!GrPixelConfig2ColorAndProfileType(desc.fConfig, &ct, &cpt)) {
return nullptr;
}
const SkAlphaType at = kPremul_SkAlphaType; // take isOpaque from caller?
SkImageInfo info = SkImageInfo::Make(desc.fWidth, desc.fHeight, ct, at, cpt);
return new GeneratorFromTexture(ctx, tex, info);
}
#endif
return nullptr;
}
///////////////////////////////////////////////////////////////////////////////////////////////////
#include "SkImage.h"
class GeneratorFromImage : public SkImageGenerator {
public:
GeneratorFromImage(const SkImage* image, const SkImageInfo& info)
: SkImageGenerator(info), fImage(image) {}
protected:
bool onGetPixels(const SkImageInfo& info, void* pixels, size_t rowBytes,
SkPMColor*, int*) override {
return fImage->readPixels(info, pixels, rowBytes, 0, 0);
}
GrTexture* onGenerateTexture(GrContext* ctx, const SkIRect* subset) override {
// waiting on https://code.google.com/p/skia/issues/detail?id=4233
return nullptr;
}
private:
SkAutoTUnref<const SkImage> fImage;
};
SkImageGenerator* SkImageGeneratorUtils::NewFromImage(const SkImage* image) {
if (image) {
const SkColorType ct = kN32_SkColorType;
const SkAlphaType at = image->isOpaque() ? kOpaque_SkAlphaType : kPremul_SkAlphaType;
const SkImageInfo info = SkImageInfo::Make(image->width(), image->height(), ct, at);
return new GeneratorFromImage(image, info);
}
return nullptr;
}
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