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/*
* Copyright 2018 Google Inc.
*
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/
/**************************************************************************************************
*** This file was autogenerated from GrRectBlurEffect.fp; do not modify.
**************************************************************************************************/
#ifndef GrRectBlurEffect_DEFINED
#define GrRectBlurEffect_DEFINED
#include "SkTypes.h"
#include "GrProxyProvider.h"
#include "SkBlurMask.h"
#include "SkScalar.h"
#include "GrFragmentProcessor.h"
#include "GrCoordTransform.h"
class GrRectBlurEffect : public GrFragmentProcessor {
public:
static sk_sp<GrTextureProxy> CreateBlurProfileTexture(GrProxyProvider* proxyProvider,
float sigma) {
unsigned int profileSize = SkScalarCeilToInt(6 * sigma);
static const GrUniqueKey::Domain kDomain = GrUniqueKey::GenerateDomain();
GrUniqueKey key;
GrUniqueKey::Builder builder(&key, kDomain, 1, "Rect Blur Mask");
builder[0] = profileSize;
builder.finish();
sk_sp<GrTextureProxy> blurProfile(
proxyProvider->findOrCreateProxyByUniqueKey(key, kTopLeft_GrSurfaceOrigin));
if (!blurProfile) {
SkImageInfo ii = SkImageInfo::MakeA8(profileSize, 1);
SkBitmap bitmap;
if (!bitmap.tryAllocPixels(ii)) {
return nullptr;
}
SkBlurMask::ComputeBlurProfile(bitmap.getAddr8(0, 0), profileSize, sigma);
bitmap.setImmutable();
sk_sp<SkImage> image = SkImage::MakeFromBitmap(bitmap);
if (!image) {
return nullptr;
}
blurProfile =
proxyProvider->createTextureProxy(std::move(image), kNone_GrSurfaceFlags, 1,
SkBudgeted::kYes, SkBackingFit::kExact);
if (!blurProfile) {
return nullptr;
}
SkASSERT(blurProfile->origin() == kTopLeft_GrSurfaceOrigin);
proxyProvider->assignUniqueKeyToProxy(key, blurProfile.get());
}
return blurProfile;
}
SkRect rect() const { return fRect; }
float sigma() const { return fSigma; }
static std::unique_ptr<GrFragmentProcessor> Make(GrProxyProvider* proxyProvider,
const GrShaderCaps& caps, const SkRect& rect,
float sigma) {
if (!caps.floatIs32Bits()) {
// We promote the rect uniform from half to float when it has large values for
// precision. If we don't have full float then fail.
if (SkScalarAbs(rect.fLeft) > 16000.f || SkScalarAbs(rect.fTop) > 16000.f ||
SkScalarAbs(rect.fRight) > 16000.f || SkScalarAbs(rect.fBottom) > 16000.f ||
SkScalarAbs(rect.width()) > 16000.f || SkScalarAbs(rect.height()) > 16000.f) {
return nullptr;
}
}
int doubleProfileSize = SkScalarCeilToInt(12 * sigma);
if (doubleProfileSize >= rect.width() || doubleProfileSize >= rect.height()) {
// if the blur sigma is too large so the gaussian overlaps the whole
// rect in either direction, fall back to CPU path for now.
return nullptr;
}
sk_sp<GrTextureProxy> blurProfile(CreateBlurProfileTexture(proxyProvider, sigma));
if (!blurProfile) {
return nullptr;
}
return std::unique_ptr<GrFragmentProcessor>(new GrRectBlurEffect(
rect, sigma, std::move(blurProfile),
GrSamplerState(GrSamplerState::WrapMode::kClamp, GrSamplerState::Filter::kBilerp)));
}
GrRectBlurEffect(const GrRectBlurEffect& src);
std::unique_ptr<GrFragmentProcessor> clone() const override;
const char* name() const override { return "RectBlurEffect"; }
private:
GrRectBlurEffect(SkRect rect, float sigma, sk_sp<GrTextureProxy> blurProfile,
GrSamplerState samplerParams)
: INHERITED(kGrRectBlurEffect_ClassID,
(OptimizationFlags)kCompatibleWithCoverageAsAlpha_OptimizationFlag)
, fRect(rect)
, fSigma(sigma)
, fBlurProfile(std::move(blurProfile), samplerParams) {
this->setTextureSamplerCnt(1);
}
GrGLSLFragmentProcessor* onCreateGLSLInstance() const override;
void onGetGLSLProcessorKey(const GrShaderCaps&, GrProcessorKeyBuilder*) const override;
bool onIsEqual(const GrFragmentProcessor&) const override;
const TextureSampler& onTextureSampler(int) const override;
GR_DECLARE_FRAGMENT_PROCESSOR_TEST
SkRect fRect;
float fSigma;
TextureSampler fBlurProfile;
typedef GrFragmentProcessor INHERITED;
};
#endif
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