GrTexture* GrTextureMaker::onGenerateStretchedTexture(GrContext* ctx, const SkGrStretch& stretch) {
if (this->width() < ctx->caps()->minTextureSize() ||
this->height() < ctx->caps()->minTextureSize())
{
// we can't trust our ability to use HW to perform the stretch, so we request
// a raster instead, and perform the stretch on the CPU.
SkBitmap bitmap;
if (!this->onGetROBitmap(&bitmap)) {
return nullptr;
}
SkBitmap stretchedBmp = stretch_on_cpu(bitmap, stretch);
return create_unstretched_bitmap_texture(ctx, stretchedBmp, GrUniqueKey());
} else {
SkAutoTUnref<GrTexture> unstretched(this->onRefUnstretchedTexture(ctx));
if (!unstretched) {
return nullptr;
}
return stretch_texture(unstretched, stretch, nullptr, GrUniqueKey());
}
}
static GrTexture* create_bitmap_texture(GrContext* ctx,
const SkBitmap& bmp,
const Stretch& stretch,
const GrUniqueKey& unstretchedKey,
const GrUniqueKey& stretchedKey) {
if (Stretch::kNone_Type != stretch.fType) {
SkAutoTUnref<GrTexture> unstretched;
// Check if we have the unstretched version in the cache, if not create it.
if (unstretchedKey.isValid()) {
unstretched.reset(ctx->textureProvider()->findAndRefTextureByUniqueKey(unstretchedKey));
}
if (!unstretched) {
unstretched.reset(create_unstretched_bitmap_texture(ctx, bmp, unstretchedKey));
if (!unstretched) {
// We might not have been able to create a unstrecthed texture because it is smaller
// than the min texture size. In that case do cpu stretching.
SkBitmap stretchedBmp = stretch_on_cpu(bmp, stretch);
return create_unstretched_bitmap_texture(ctx, stretchedBmp, stretchedKey);
}
}
return stretch_texture(unstretched, stretch, bmp.pixelRef(), stretchedKey);
}
return create_unstretched_bitmap_texture(ctx, bmp, unstretchedKey);
}
