sk_sp<GrFragmentProcessor> SkPerlinNoiseShader::asFragmentProcessor(const AsFPArgs& args) const {
SkASSERT(args.fContext);
SkMatrix localMatrix = this->getLocalMatrix();
if (args.fLocalMatrix) {
localMatrix.preConcat(*args.fLocalMatrix);
}
SkMatrix matrix = *args.fViewMatrix;
matrix.preConcat(localMatrix);
if (0 == fNumOctaves) {
if (kFractalNoise_Type == fType) {
// Extract the incoming alpha and emit rgba = (a/4, a/4, a/4, a/2)
// TODO: Either treat the output of this shader as sRGB or allow client to specify a
// color space of the noise. Either way, this case (and the GLSL) need to convert to
// the destination.
sk_sp<GrFragmentProcessor> inner(
GrConstColorProcessor::Make(GrColor4f::FromGrColor(0x80404040),
GrConstColorProcessor::kModulateRGBA_InputMode));
return GrFragmentProcessor::MulOutputByInputAlpha(std::move(inner));
}
// Emit zero.
return GrConstColorProcessor::Make(GrColor4f::TransparentBlack(),
GrConstColorProcessor::kIgnore_InputMode);
}
// Either we don't stitch tiles, either we have a valid tile size
SkASSERT(!fStitchTiles || !fTileSize.isEmpty());
SkPerlinNoiseShader::PaintingData* paintingData =
new PaintingData(fTileSize, fSeed, fBaseFrequencyX, fBaseFrequencyY, matrix);
sk_sp<GrTextureProxy> permutationsProxy(GrMakeCachedBitmapProxy(
args.fContext->resourceProvider(),
paintingData->getPermutationsBitmap()));
sk_sp<GrTextureProxy> noiseProxy(GrMakeCachedBitmapProxy(args.fContext->resourceProvider(),
paintingData->getNoiseBitmap()));
SkMatrix m = *args.fViewMatrix;
m.setTranslateX(-localMatrix.getTranslateX() + SK_Scalar1);
m.setTranslateY(-localMatrix.getTranslateY() + SK_Scalar1);
if (permutationsProxy && noiseProxy) {
sk_sp<GrFragmentProcessor> inner(
GrPerlinNoiseEffect::Make(args.fContext->resourceProvider(),
fType,
fNumOctaves,
fStitchTiles,
paintingData,
std::move(permutationsProxy),
std::move(noiseProxy),
m));
return GrFragmentProcessor::MulOutputByInputAlpha(std::move(inner));
}
delete paintingData;
return nullptr;
}
sk_sp<GrTextureProxy> onAsTextureProxyRef(GrContext* context) const override {
if (context) {
return GrMakeCachedBitmapProxy(context->contextPriv().proxyProvider(), fBitmap);
}
return nullptr;
}
sk_sp<SkSpecialImage> SkSpecialImage::makeTextureImage(GrContext* context) {
#if SK_SUPPORT_GPU
if (!context) {
return nullptr;
}
if (GrContext* curContext = as_SIB(this)->onGetContext()) {
return curContext == context ? sk_sp<SkSpecialImage>(SkRef(this)) : nullptr;
}
auto proxyProvider = context->contextPriv().proxyProvider();
SkBitmap bmp;
// At this point, we are definitely not texture-backed, so we must be raster or generator
// backed. If we remove the special-wrapping-an-image subclass, we may be able to assert that
// we are strictly raster-backed (i.e. generator images become raster when they are specialized)
// in which case getROPixels could turn into peekPixels...
if (!this->getROPixels(&bmp)) {
return nullptr;
}
if (bmp.empty()) {
return SkSpecialImage::MakeFromRaster(SkIRect::MakeEmpty(), bmp, &this->props());
}
// TODO: this is a tight copy of 'bmp' but it doesn't have to be (given SkSpecialImage's
// semantics). Since this is cached though we would have to bake the fit into the cache key.
sk_sp<GrTextureProxy> proxy = GrMakeCachedBitmapProxy(proxyProvider, bmp);
if (!proxy) {
return nullptr;
}
const SkIRect rect = SkIRect::MakeWH(proxy->width(), proxy->height());
// GrMakeCachedBitmapProxy has uploaded only the specified subset of 'bmp' so we need not
// bother with SkBitmap::getSubset
return SkSpecialImage::MakeDeferredFromGpu(context,
rect,
this->uniqueID(),
std::move(proxy),
sk_ref_sp(this->getColorSpace()),
&this->props(),
this->alphaType());
#else
return nullptr;
#endif
}
