Remove SkRRectsGaussianEdgeShader

This class is no longer used.

GOLD_TRYBOT_URL= https://gold.skia.org/search?issue=3734

Change-Id: I16634760df6b31c7e97c893b7e2b982cd7b1d1fd
Reviewed-on: https://skia-review.googlesource.com/3734
Reviewed-by: Brian Salomon <bsalomon@google.com>
Commit-Queue: Robert Phillips <robertphillips@google.com>

1 files changed, 0 insertions, 483 deletions

diff --git a/src/effects/SkRRectsGaussianEdgeShader.cpp b/src/effects/SkRRectsGaussianEdgeShader.cpp
deleted file mode 100644
index 3b1d5650c3..0000000000
--- a/src/effects/SkRRectsGaussianEdgeShader.cpp
+++ /dev/null
@@ -1,483 +0,0 @@
-/*
- * Copyright 2016 Google Inc.
- *
- * Use of this source code is governed by a BSD-style license that can be
- * found in the LICENSE file.
- */
-
-#include "SkRRectsGaussianEdgeShader.h"
-#include "SkReadBuffer.h"
-#include "SkWriteBuffer.h"
-
- /** \class SkRRectsGaussianEdgeShaderImpl
-  * This shader applies a gaussian edge to the intersection of two round rects.
-  * The round rects must have the same radii at each corner and the x&y radii
-  * must also be equal.
-  */
-class SkRRectsGaussianEdgeShaderImpl : public SkShader {
-public:
-    SkRRectsGaussianEdgeShaderImpl(const SkRRect& first, const SkRRect& second, SkScalar radius)
-        : fFirst(first)
-        , fSecond(second)
-        , fRadius(radius) {
-    }
-
-    bool isOpaque() const override { return false; }
-
-#if SK_SUPPORT_GPU
-    sk_sp<GrFragmentProcessor> asFragmentProcessor(const AsFPArgs&) const override;
-#endif
-
-    class GaussianEdgeShaderContext : public SkShader::Context {
-    public:
-        GaussianEdgeShaderContext(const SkRRectsGaussianEdgeShaderImpl&, const ContextRec&);
-
-        ~GaussianEdgeShaderContext() override { }
-
-        void shadeSpan(int x, int y, SkPMColor[], int count) override;
-
-        uint32_t getFlags() const override { return 0; }
-
-    private:
-        SkColor                   fPaintColor;
-
-        typedef SkShader::Context INHERITED;
-    };
-
-    SK_TO_STRING_OVERRIDE()
-    SK_DECLARE_PUBLIC_FLATTENABLE_DESERIALIZATION_PROCS(SkRRectsGaussianEdgeShaderImpl)
-
-protected:
-    void flatten(SkWriteBuffer&) const override;
-    size_t onContextSize(const ContextRec&) const override;
-    Context* onCreateContext(const ContextRec&, void*) const override;
-
-private:
-    SkRRect  fFirst;
-    SkRRect  fSecond;
-    SkScalar fRadius;
-
-    friend class SkRRectsGaussianEdgeShader; // for serialization registration system
-
-    typedef SkShader INHERITED;
-};
-
-////////////////////////////////////////////////////////////////////////////
-
-#if SK_SUPPORT_GPU
-
-#include "GrCoordTransform.h"
-#include "GrFragmentProcessor.h"
-#include "GrInvariantOutput.h"
-#include "glsl/GrGLSLFragmentProcessor.h"
-#include "glsl/GrGLSLFragmentShaderBuilder.h"
-#include "glsl/GrGLSLProgramDataManager.h"
-#include "glsl/GrGLSLUniformHandler.h"
-#include "SkGr.h"
-#include "SkGrPriv.h"
-
-class RRectsGaussianEdgeFP : public GrFragmentProcessor {
-public:
-    enum Mode {
-        kCircle_Mode,
-        kRect_Mode,
-        kSimpleCircular_Mode,
-    };
-
-    RRectsGaussianEdgeFP(const SkRRect& first, const SkRRect& second, SkScalar radius)
-        : fFirst(first)
-        , fSecond(second)
-        , fRadius(radius) {
-        this->initClassID<RRectsGaussianEdgeFP>();
-        this->setWillReadFragmentPosition();
-
-        fFirstMode = ComputeMode(fFirst);
-        fSecondMode = ComputeMode(fSecond);
-    }
-
-    class GLSLRRectsGaussianEdgeFP : public GrGLSLFragmentProcessor {
-    public:
-        GLSLRRectsGaussianEdgeFP() { }
-
-        // This method emits code so that, for each shape, the distance from the edge is returned
-        // in 'outputName' clamped to 0..1 with positive distance being towards the center of the
-        // shape. The distance will have been normalized by the radius.
-        void emitModeCode(Mode mode,
-                          GrGLSLFPFragmentBuilder* fragBuilder,
-                          const char* posName,
-                          const char* sizesName,
-                          const char* radiiName,
-                          const char* radName,
-                          const char* outputName,
-                          const char  indices[2]) { // how to access the params for the 2 rrects
-
-            // Positive distance is towards the center of the circle.
-            // Map all the cases to the lower right quadrant.
-            fragBuilder->codeAppendf("vec2 delta = abs(%s.xy - %s.%s);",
-                                     fragBuilder->fragmentPosition(), posName, indices);
-
-            switch (mode) {
-            case kCircle_Mode:
-                // When a shadow circle gets large we can have some precision issues if
-                // we do "length(delta)/radius". The scaleDist temporary cuts the
-                // delta vector down a bit before invoking length.
-                fragBuilder->codeAppendf("float scaledDist = length(delta/%s);", radName);
-                fragBuilder->codeAppendf("%s = clamp((%s.%c/%s - scaledDist), 0.0, 1.0);",
-                                         outputName, sizesName, indices[0], radName);
-                break;
-            case kRect_Mode:
-                fragBuilder->codeAppendf(
-                    "vec2 rectDist = vec2(1.0 - clamp((%s.%c - delta.x)/%s, 0.0, 1.0),"
-                                         "1.0 - clamp((%s.%c - delta.y)/%s, 0.0, 1.0));",
-                    sizesName, indices[0], radName,
-                    sizesName, indices[1], radName);
-                fragBuilder->codeAppendf("%s = clamp(1.0 - length(rectDist), 0.0, 1.0);",
-                                         outputName);
-                break;
-            case kSimpleCircular_Mode:
-                // For the circular round rect we combine 2 distances:
-                //    the fractional position from the corner inset point to the corner's circle
-                //    the minimum perpendicular distance to the bounding rectangle
-                // The first distance is used when the pixel is inside the ice-cream-cone-shaped
-                // portion of a corner. The second is used everywhere else.
-                // This is intended to approximate the interpolation pattern if we had tessellated
-                // this geometry into a RRect outside and a rect inside.
-
-                //----------------
-                // rect distance computation
-                fragBuilder->codeAppendf("float xDist = (%s.%c - delta.x) / %s;",
-                                         sizesName, indices[0], radName);
-                fragBuilder->codeAppendf("float yDist = (%s.%c - delta.y) / %s;",
-                                         sizesName, indices[1], radName);
-                fragBuilder->codeAppend("float rectDist = clamp(min(xDist, yDist), 0.0, 1.0);");
-
-                //----------------
-                // ice-cream-cone fractional distance computation
-
-                // When the blurRadius is larger than the corner radius we want to use it to
-                // compute the pointy end of the ice cream cone. If it smaller we just want to use
-                // the center of the corner's circle. When using the blurRadius the inset amount
-                // can't exceed the halfwidths of the RRect.
-                fragBuilder->codeAppendf("float insetDist = min(max(%s, %s.%c),min(%s.%c, %s.%c));",
-                                         radName, radiiName, indices[0],
-                                         sizesName, indices[0], sizesName, indices[1]);
-                // "maxValue" is a correction term for if the blurRadius is larger than the
-                // size of the RRect. In that case we don't want to go all the way to black.
-                fragBuilder->codeAppendf("float maxValue = insetDist/%s;", radName);
-
-                fragBuilder->codeAppendf("vec2 coneBottom = vec2(%s.%c - insetDist,"
-                                                                "%s.%c - insetDist);",
-                                         sizesName, indices[0], sizesName, indices[1]);
-
-                fragBuilder->codeAppendf("vec2 cornerTop = vec2(%s.%c - %s.%c, %s.%c) -"
-                                                                    "coneBottom;",
-                                         sizesName, indices[0], radiiName, indices[0],
-                                         sizesName, indices[1]);
-                fragBuilder->codeAppendf("vec2 cornerRight = vec2(%s.%c, %s.%c - %s.%c) -"
-                                                                    "coneBottom;",
-                                         sizesName, indices[0],
-                                         sizesName, indices[1], radiiName, indices[1]);
-
-                fragBuilder->codeAppend("vec2 ptInConeSpace = delta - coneBottom;");
-                fragBuilder->codeAppend("float distToPtInConeSpace = length(ptInConeSpace);");
-
-                fragBuilder->codeAppend("float cross1 =  ptInConeSpace.x * cornerTop.y -"
-                                                        "ptInConeSpace.y * cornerTop.x;");
-                fragBuilder->codeAppend("float cross2 = -ptInConeSpace.x * cornerRight.y + "
-                                                        "ptInConeSpace.y * cornerRight.x;");
-
-                fragBuilder->codeAppend("float inCone = step(0.0, cross1) * step(0.0, cross2);");
-
-                fragBuilder->codeAppendf("vec2 cornerCenterInConeSpace = vec2(insetDist - %s.%c);",
-                                         radiiName, indices[0]);
-
-                fragBuilder->codeAppend("vec2 connectingVec = ptInConeSpace -"
-                                                                    "cornerCenterInConeSpace;");
-                fragBuilder->codeAppend("ptInConeSpace = normalize(ptInConeSpace);");
-
-                // "a" (i.e., dot(ptInConeSpace, ptInConeSpace) should always be 1.0f since
-                // ptInConeSpace is now normalized
-                fragBuilder->codeAppend("float b = 2.0 * dot(ptInConeSpace, connectingVec);");
-                fragBuilder->codeAppendf("float c = dot(connectingVec, connectingVec) - "
-                                                                                "%s.%c * %s.%c;",
-                                         radiiName, indices[0], radiiName, indices[0]);
-
-                fragBuilder->codeAppend("float fourAC = 4*c;");
-                // This max prevents sqrt(-1) when outside the cone
-                fragBuilder->codeAppend("float bSq = max(b*b, fourAC);");
-
-                // lop off negative values that are outside the cone
-                fragBuilder->codeAppend("float coneDist = max(0.0, "
-                                                             "0.5 * (-b + sqrt(bSq - fourAC)));");
-                // make the coneDist a fraction of how far it is from the edge to the cone's base
-                fragBuilder->codeAppend("coneDist = (maxValue*coneDist) /"
-                                                               "(coneDist+distToPtInConeSpace);");
-                fragBuilder->codeAppend("coneDist = clamp(coneDist, 0.0, 1.0);");
-
-                //----------------
-                fragBuilder->codeAppendf("%s = (inCone * coneDist) + ((1.0-inCone) * rectDist);",
-                                         outputName);
-                break;
-            }
-        }
-
-        void emitCode(EmitArgs& args) override {
-            const RRectsGaussianEdgeFP& fp = args.fFp.cast<RRectsGaussianEdgeFP>();
-            GrGLSLFPFragmentBuilder* fragBuilder = args.fFragBuilder;
-            GrGLSLUniformHandler* uniformHandler = args.fUniformHandler;
-
-            const char* positionsUniName = nullptr;
-            fPositionsUni = uniformHandler->addUniform(kFragment_GrShaderFlag,
-                                                       kVec4f_GrSLType, kDefault_GrSLPrecision,
-                                                       "Positions", &positionsUniName);
-            const char* sizesUniName = nullptr;
-            fSizesUni = uniformHandler->addUniform(kFragment_GrShaderFlag,
-                                                   kVec4f_GrSLType, kDefault_GrSLPrecision,
-                                                   "Sizes", &sizesUniName);
-            const char* radiiUniName = nullptr;
-            if (fp.fFirstMode == kSimpleCircular_Mode || fp.fSecondMode == kSimpleCircular_Mode) {
-                fRadiiUni = uniformHandler->addUniform(kFragment_GrShaderFlag,
-                                                       kVec4f_GrSLType, kDefault_GrSLPrecision,
-                                                       "Radii", &radiiUniName);
-            }
-            const char* radUniName = nullptr;
-            fRadiusUni = uniformHandler->addUniform(kFragment_GrShaderFlag,
-                                                    kFloat_GrSLType, kDefault_GrSLPrecision,
-                                                    "Radius", &radUniName);
-
-            fragBuilder->codeAppend("float firstDist;");
-            fragBuilder->codeAppend("{");
-            this->emitModeCode(fp.firstMode(), fragBuilder,
-                               positionsUniName, sizesUniName, radiiUniName,
-                               radUniName, "firstDist", "xy");
-            fragBuilder->codeAppend("}");
-
-            fragBuilder->codeAppend("float secondDist;");
-            fragBuilder->codeAppend("{");
-            this->emitModeCode(fp.secondMode(), fragBuilder,
-                               positionsUniName, sizesUniName, radiiUniName,
-                               radUniName, "secondDist", "zw");
-            fragBuilder->codeAppend("}");
-
-            fragBuilder->codeAppend("vec2 distVec = vec2(1.0 - firstDist, 1.0 - secondDist);");
-
-            // Finally use the distance to apply the Gaussian edge
-            fragBuilder->codeAppend("float factor = clamp(length(distVec), 0.0, 1.0);");
-            fragBuilder->codeAppend("factor = exp(-factor * factor * 4.0) - 0.018;");
-            fragBuilder->codeAppendf("%s = factor*%s;",
-                                     args.fOutputColor, args.fInputColor);
-        }
-
-        static void GenKey(const GrProcessor& proc, const GrGLSLCaps&,
-                           GrProcessorKeyBuilder* b) {
-            const RRectsGaussianEdgeFP& fp = proc.cast<RRectsGaussianEdgeFP>();
-
-            b->add32(fp.firstMode() | (fp.secondMode() << 4));
-        }
-
-    protected:
-        void onSetData(const GrGLSLProgramDataManager& pdman, const GrProcessor& proc) override {
-            const RRectsGaussianEdgeFP& edgeFP = proc.cast<RRectsGaussianEdgeFP>();
-
-            const SkRRect& first = edgeFP.first();
-            const SkRRect& second = edgeFP.second();
-
-            pdman.set4f(fPositionsUni,
-                        first.getBounds().centerX(),
-                        first.getBounds().centerY(),
-                        second.getBounds().centerX(),
-                        second.getBounds().centerY());
-
-            pdman.set4f(fSizesUni, 
-                        0.5f * first.rect().width(),
-                        0.5f * first.rect().height(),
-                        0.5f * second.rect().width(),
-                        0.5f * second.rect().height());
-
-            if (edgeFP.firstMode() == kSimpleCircular_Mode ||
-                edgeFP.secondMode() == kSimpleCircular_Mode) {
-                // This is a bit of overkill since fX should equal fY for both round rects but it
-                // makes the shader code simpler.
-                pdman.set4f(fRadiiUni, 
-                             first.getSimpleRadii().fX,  first.getSimpleRadii().fY,
-                             second.getSimpleRadii().fX, second.getSimpleRadii().fY);
-            }
-
-            pdman.set1f(fRadiusUni, edgeFP.radius());
-        }
-
-    private:
-        // The centers of the two round rects (x1, y1, x2, y2)
-        GrGLSLProgramDataManager::UniformHandle fPositionsUni;
-
-        // The half widths and half heights of the two round rects (w1/2, h1/2, w2/2, h2/2)
-        // For circles we still upload both width & height to simplify things
-        GrGLSLProgramDataManager::UniformHandle fSizesUni;
-
-        // The corner radii of the two round rects (rx1, ry1, rx2, ry2)
-        // We upload both the x&y radii (although they are currently always the same) to make
-        // the indexing in the shader code simpler. In some future world we could also support
-        // non-circular corner round rects & ellipses.
-        GrGLSLProgramDataManager::UniformHandle fRadiiUni;
-
-        // The radius parameters (radius)
-        GrGLSLProgramDataManager::UniformHandle fRadiusUni;
-
-        typedef GrGLSLFragmentProcessor INHERITED;
-    };
-
-    void onGetGLSLProcessorKey(const GrGLSLCaps& caps, GrProcessorKeyBuilder* b) const override {
-        GLSLRRectsGaussianEdgeFP::GenKey(*this, caps, b);
-    }
-
-    const char* name() const override { return "RRectsGaussianEdgeFP"; }
-
-    void onComputeInvariantOutput(GrInvariantOutput* inout) const override {
-        inout->setToUnknown(GrInvariantOutput::kWill_ReadInput);
-    }
-
-    const SkRRect& first() const { return fFirst; }
-    Mode firstMode() const { return fFirstMode; }
-    const SkRRect& second() const { return fSecond; }
-    Mode secondMode() const { return fSecondMode; }
-    SkScalar radius() const { return fRadius; }
-
-private:
-    static Mode ComputeMode(const SkRRect& rr) {
-        if (rr.isCircle()) {
-            return kCircle_Mode;
-        } else if (rr.isRect()) {
-            return kRect_Mode;
-        } else {
-            SkASSERT(rr.isSimpleCircular());
-            return kSimpleCircular_Mode;
-        }
-    }
-
-    GrGLSLFragmentProcessor* onCreateGLSLInstance() const override {
-        return new GLSLRRectsGaussianEdgeFP;
-    }
-
-    bool onIsEqual(const GrFragmentProcessor& proc) const override {
-        const RRectsGaussianEdgeFP& edgeFP = proc.cast<RRectsGaussianEdgeFP>();
-        return fFirst  == edgeFP.fFirst &&
-               fSecond == edgeFP.fSecond && 
-               fRadius == edgeFP.fRadius;
-    }
-
-    SkRRect  fFirst;
-    Mode     fFirstMode;
-    SkRRect  fSecond;
-    Mode     fSecondMode;
-    SkScalar fRadius;
-
-    typedef GrFragmentProcessor INHERITED;
-};
-
-////////////////////////////////////////////////////////////////////////////
-
-sk_sp<GrFragmentProcessor> SkRRectsGaussianEdgeShaderImpl::asFragmentProcessor(
-                                                                    const AsFPArgs& args) const {
-    return sk_make_sp<RRectsGaussianEdgeFP>(fFirst, fSecond, fRadius);
-}
-
-#endif
-
-////////////////////////////////////////////////////////////////////////////
-
-SkRRectsGaussianEdgeShaderImpl::GaussianEdgeShaderContext::GaussianEdgeShaderContext(
-                                                    const SkRRectsGaussianEdgeShaderImpl& shader,
-                                                    const ContextRec& rec)
-    : INHERITED(shader, rec) {
-
-    fPaintColor = rec.fPaint->getColor();
-}
-
-void SkRRectsGaussianEdgeShaderImpl::GaussianEdgeShaderContext::shadeSpan(int x, int y,
-                                                                          SkPMColor result[],
-                                                                          int count) {
-    // TODO: implement
-    for (int i = 0; i < count; ++i) {
-        result[i] = fPaintColor;
-    }
-}
-
-////////////////////////////////////////////////////////////////////////////
-
-#ifndef SK_IGNORE_TO_STRING
-void SkRRectsGaussianEdgeShaderImpl::toString(SkString* str) const {
-    str->appendf("RRectsGaussianEdgeShader: ()");
-}
-#endif
-
-sk_sp<SkFlattenable> SkRRectsGaussianEdgeShaderImpl::CreateProc(SkReadBuffer& buf) {
-    // Discarding SkShader flattenable params
-    bool hasLocalMatrix = buf.readBool();
-    SkAssertResult(!hasLocalMatrix);
-
-    SkRect rect1, rect2;
-
-    buf.readRect(&rect1);
-    SkScalar xRad1 = buf.readScalar();
-    SkScalar yRad1 = buf.readScalar();
-
-    buf.readRect(&rect2);
-    SkScalar xRad2 = buf.readScalar();
-    SkScalar yRad2 = buf.readScalar();
-
-    SkScalar radius = buf.readScalar();
-
-    return sk_make_sp<SkRRectsGaussianEdgeShaderImpl>(SkRRect::MakeRectXY(rect1, xRad1, yRad1),
-                                                      SkRRect::MakeRectXY(rect2, xRad2, yRad2),
-                                                      radius);
-}
-
-void SkRRectsGaussianEdgeShaderImpl::flatten(SkWriteBuffer& buf) const {
-    INHERITED::flatten(buf);
-
-    SkASSERT(fFirst.isRect() || fFirst.isCircle() || fFirst.isSimpleCircular());
-    buf.writeRect(fFirst.rect());
-    const SkVector& radii1 = fFirst.getSimpleRadii();
-    buf.writeScalar(radii1.fX);
-    buf.writeScalar(radii1.fY);
-
-    SkASSERT(fSecond.isRect() || fSecond.isCircle() || fSecond.isSimpleCircular());
-    buf.writeRect(fSecond.rect());
-    const SkVector& radii2 = fSecond.getSimpleRadii();
-    buf.writeScalar(radii2.fX);
-    buf.writeScalar(radii2.fY);
-
-    buf.writeScalar(fRadius);
-}
-
-size_t SkRRectsGaussianEdgeShaderImpl::onContextSize(const ContextRec& rec) const {
-    return sizeof(GaussianEdgeShaderContext);
-}
-
-SkShader::Context* SkRRectsGaussianEdgeShaderImpl::onCreateContext(const ContextRec& rec,
-                                                                   void* storage) const {
-    return new (storage) GaussianEdgeShaderContext(*this, rec);
-}
-
-///////////////////////////////////////////////////////////////////////////////
-
-sk_sp<SkShader> SkRRectsGaussianEdgeShader::Make(const SkRRect& first,
-                                                 const SkRRect& second,
-                                                 SkScalar radius, SkScalar unused) {
-    if ((!first.isRect()  && !first.isCircle()  && !first.isSimpleCircular()) || 
-        (!second.isRect() && !second.isCircle() && !second.isSimpleCircular())) {
-        // we only deal with the shapes where the x & y radii are equal 
-        // and the same for all four corners
-        return nullptr;
-    }
-
-    return sk_make_sp<SkRRectsGaussianEdgeShaderImpl>(first, second, radius);
-}
-
-///////////////////////////////////////////////////////////////////////////////
-
-SK_DEFINE_FLATTENABLE_REGISTRAR_GROUP_START(SkRRectsGaussianEdgeShader)
-SK_DEFINE_FLATTENABLE_REGISTRAR_ENTRY(SkRRectsGaussianEdgeShaderImpl)
-SK_DEFINE_FLATTENABLE_REGISTRAR_GROUP_END
-
-///////////////////////////////////////////////////////////////////////////////