sk_sp<SkImage> SkImage_Gpu::onMakeSubset(const SkIRect& subset) const {
GrContext* ctx = fTexture->getContext();
GrSurfaceDesc desc = fTexture->desc();
desc.fWidth = subset.width();
desc.fHeight = subset.height();
sk_sp<GrTexture> subTx(ctx->textureProvider()->createTexture(desc, fBudgeted));
if (!subTx) {
return nullptr;
}
ctx->copySurface(subTx.get(), fTexture.get(), subset, SkIPoint::Make(0, 0));
return sk_make_sp<SkImage_Gpu>(desc.fWidth, desc.fHeight, kNeedNewImageUniqueID,
fAlphaType, std::move(subTx), fColorSpace, fBudgeted);
}
sk_sp<SkImage> onMakeTightSubset(const SkIRect& subset) const override {
if (0 == subset.fLeft && 0 == subset.fTop &&
fTexture->width() == subset.width() &&
fTexture->height() == subset.height()) {
// The existing GrTexture is already tight so reuse it in the SkImage
return sk_make_sp<SkImage_Gpu>(fTexture->width(), fTexture->height(),
kNeedNewImageUniqueID,
fAlphaType, fTexture, SkBudgeted::kYes);
}
GrContext* ctx = fTexture->getContext();
GrSurfaceDesc desc = fTexture->desc();
desc.fWidth = subset.width();
desc.fHeight = subset.height();
SkAutoTUnref<GrTexture> subTx(ctx->textureProvider()->createTexture(desc,
SkBudgeted::kYes));
if (!subTx) {
return nullptr;
}
ctx->copySurface(subTx, fTexture, subset, SkIPoint::Make(0, 0));
return sk_make_sp<SkImage_Gpu>(desc.fWidth, desc.fHeight, kNeedNewImageUniqueID,
fAlphaType, subTx, SkBudgeted::kYes);
}