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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 "include/core/SkTypes.h"
#include "include/core/SkScalar.h"
#include "src/core/SkBlurMask.h"
#include "src/gpu/GrProxyProvider.h"
#include "src/gpu/GrShaderCaps.h"
#include "src/gpu/GrCoordTransform.h"
#include "src/gpu/GrFragmentProcessor.h"
class GrRectBlurEffect : public GrFragmentProcessor {
static std::unique_ptr<GrFragmentProcessor> Make(GrProxyProvider* proxyProvider,
const GrShaderCaps& caps, const SkRect& rect,
float sigma) {
float doubleProfileSize = (12 * sigma);
if (!caps.floatIs32Bits()) {
// We promote the math that gets us into the Gaussian space to full float when the rect
// coords are large. If we don't have full float then fail. We could probably clip the
// rect to an outset device bounds instead.
if (SkScalarAbs(rect.fLeft) > 16000.f || SkScalarAbs(rect.fTop) > 16000.f ||
SkScalarAbs(rect.fRight) > 16000.f || SkScalarAbs(rect.fBottom) > 16000.f) {
return nullptr;
// Sigma is always a half.
SkASSERT(sigma > 0);
if (sigma > 16000.f) {
return nullptr;
if (doubleProfileSize >= (float)rect.width() || doubleProfileSize >= (float)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;
return std::unique_ptr<GrFragmentProcessor>(new GrRectBlurEffect(rect, sigma));
GrRectBlurEffect(const GrRectBlurEffect& src);
std::unique_ptr<GrFragmentProcessor> clone() const override;
const char* name() const override { return "RectBlurEffect"; }
SkRect rect;
float sigma;
GrRectBlurEffect(SkRect rect, float sigma)
: INHERITED(kGrRectBlurEffect_ClassID,
, rect(rect)
, sigma(sigma) {}
GrGLSLFragmentProcessor* onCreateGLSLInstance() const override;
void onGetGLSLProcessorKey(const GrShaderCaps&, GrProcessorKeyBuilder*) const override;
bool onIsEqual(const GrFragmentProcessor&) const override;
typedef GrFragmentProcessor INHERITED;