src/gpu/effects/generated/GrRectBlurEffect.h

/*
 * 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 {
public:
    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;

private:
    GrRectBlurEffect(SkRect rect, float sigma)
            : INHERITED(kGrRectBlurEffect_ClassID,
                        (OptimizationFlags)kCompatibleWithCoverageAsAlpha_OptimizationFlag)
            , rect(rect)
            , sigma(sigma) {}
    GrGLSLFragmentProcessor* onCreateGLSLInstance() const override;
    void onGetGLSLProcessorKey(const GrShaderCaps&, GrProcessorKeyBuilder*) const override;
    bool onIsEqual(const GrFragmentProcessor&) const override;
    GR_DECLARE_FRAGMENT_PROCESSOR_TEST
    typedef GrFragmentProcessor INHERITED;
};
#endif