1fe17456d5e528078ce69b5f15cf7adf1fab963fandroid-build-team Robot/* 2fe17456d5e528078ce69b5f15cf7adf1fab963fandroid-build-team Robot * Copyright 2012 Google Inc. 3fe17456d5e528078ce69b5f15cf7adf1fab963fandroid-build-team Robot * 4fe17456d5e528078ce69b5f15cf7adf1fab963fandroid-build-team Robot * Use of this source code is governed by a BSD-style license that can be 5fe17456d5e528078ce69b5f15cf7adf1fab963fandroid-build-team Robot * found in the LICENSE file. 6fe17456d5e528078ce69b5f15cf7adf1fab963fandroid-build-team Robot */ 7fe17456d5e528078ce69b5f15cf7adf1fab963fandroid-build-team Robot 8fe17456d5e528078ce69b5f15cf7adf1fab963fandroid-build-team Robot#ifndef SkTwoPointConicalGradient_DEFINED 9fe17456d5e528078ce69b5f15cf7adf1fab963fandroid-build-team Robot#define SkTwoPointConicalGradient_DEFINED 10fe17456d5e528078ce69b5f15cf7adf1fab963fandroid-build-team Robot 11fe17456d5e528078ce69b5f15cf7adf1fab963fandroid-build-team Robot#include "SkColorSpaceXformer.h" 12fe17456d5e528078ce69b5f15cf7adf1fab963fandroid-build-team Robot#include "SkGradientShaderPriv.h" 13fe17456d5e528078ce69b5f15cf7adf1fab963fandroid-build-team Robot 14fe17456d5e528078ce69b5f15cf7adf1fab963fandroid-build-team Robotclass SkTwoPointConicalGradient final : public SkGradientShaderBase { 15fe17456d5e528078ce69b5f15cf7adf1fab963fandroid-build-team Robotpublic: 16fe17456d5e528078ce69b5f15cf7adf1fab963fandroid-build-team Robot // See https://skia.org/dev/design/conical for what focal data means and how our shader works. 17fe17456d5e528078ce69b5f15cf7adf1fab963fandroid-build-team Robot // We make it public so the GPU shader can also use it. 18fe17456d5e528078ce69b5f15cf7adf1fab963fandroid-build-team Robot struct FocalData { 19fe17456d5e528078ce69b5f15cf7adf1fab963fandroid-build-team Robot SkScalar fR1; // r1 after mapping focal point to (0, 0) 20fe17456d5e528078ce69b5f15cf7adf1fab963fandroid-build-team Robot SkScalar fFocalX; // f 21fe17456d5e528078ce69b5f15cf7adf1fab963fandroid-build-team Robot bool fIsSwapped; // whether we swapped r0, r1 22fe17456d5e528078ce69b5f15cf7adf1fab963fandroid-build-team Robot 23fe17456d5e528078ce69b5f15cf7adf1fab963fandroid-build-team Robot // The input r0, r1 are the radii when we map centers to {(0, 0), (1, 0)}. 24fe17456d5e528078ce69b5f15cf7adf1fab963fandroid-build-team Robot // We'll post concat matrix with our transformation matrix that maps focal point to (0, 0). 25fe17456d5e528078ce69b5f15cf7adf1fab963fandroid-build-team Robot void set(SkScalar r0, SkScalar r1, SkMatrix& matrix); 26fe17456d5e528078ce69b5f15cf7adf1fab963fandroid-build-team Robot 27fe17456d5e528078ce69b5f15cf7adf1fab963fandroid-build-team Robot // Whether the focal point (0, 0) is on the end circle with center (1, 0) and radius r1. If 28fe17456d5e528078ce69b5f15cf7adf1fab963fandroid-build-team Robot // this is true, it's as if an aircraft is flying at Mach 1 and all circles (soundwaves) 29fe17456d5e528078ce69b5f15cf7adf1fab963fandroid-build-team Robot // will go through the focal point (aircraft). In our previous implementations, this was 30fe17456d5e528078ce69b5f15cf7adf1fab963fandroid-build-team Robot // known as the edge case where the inside circle touches the outside circle (on the focal 31fe17456d5e528078ce69b5f15cf7adf1fab963fandroid-build-team Robot // point). If we were to solve for t bruteforcely using a quadratic equation, this case 32fe17456d5e528078ce69b5f15cf7adf1fab963fandroid-build-team Robot // implies that the quadratic equation degenerates to a linear equation. 33fe17456d5e528078ce69b5f15cf7adf1fab963fandroid-build-team Robot bool isFocalOnCircle() const { return SkScalarNearlyZero(1 - fR1); } 34fe17456d5e528078ce69b5f15cf7adf1fab963fandroid-build-team Robot 35fe17456d5e528078ce69b5f15cf7adf1fab963fandroid-build-team Robot bool isSwapped() const { return fIsSwapped; } 36fe17456d5e528078ce69b5f15cf7adf1fab963fandroid-build-team Robot bool isWellBehaved() const { return !this->isFocalOnCircle() && fR1 > 1; } 37fe17456d5e528078ce69b5f15cf7adf1fab963fandroid-build-team Robot bool isNativelyFocal() const { return SkScalarNearlyZero(fFocalX); } 38fe17456d5e528078ce69b5f15cf7adf1fab963fandroid-build-team Robot }; 39fe17456d5e528078ce69b5f15cf7adf1fab963fandroid-build-team Robot 40fe17456d5e528078ce69b5f15cf7adf1fab963fandroid-build-team Robot enum class Type { 41fe17456d5e528078ce69b5f15cf7adf1fab963fandroid-build-team Robot kRadial, 42fe17456d5e528078ce69b5f15cf7adf1fab963fandroid-build-team Robot kStrip, 43fe17456d5e528078ce69b5f15cf7adf1fab963fandroid-build-team Robot kFocal 44fe17456d5e528078ce69b5f15cf7adf1fab963fandroid-build-team Robot }; 45fe17456d5e528078ce69b5f15cf7adf1fab963fandroid-build-team Robot 46fe17456d5e528078ce69b5f15cf7adf1fab963fandroid-build-team Robot static sk_sp<SkShader> Create(const SkPoint& start, SkScalar startRadius, 47fe17456d5e528078ce69b5f15cf7adf1fab963fandroid-build-team Robot const SkPoint& end, SkScalar endRadius, 48fe17456d5e528078ce69b5f15cf7adf1fab963fandroid-build-team Robot const Descriptor&); 49fe17456d5e528078ce69b5f15cf7adf1fab963fandroid-build-team Robot 50fe17456d5e528078ce69b5f15cf7adf1fab963fandroid-build-team Robot SkShader::GradientType asAGradient(GradientInfo* info) const override; 51fe17456d5e528078ce69b5f15cf7adf1fab963fandroid-build-team Robot#if SK_SUPPORT_GPU 52fe17456d5e528078ce69b5f15cf7adf1fab963fandroid-build-team Robot std::unique_ptr<GrFragmentProcessor> asFragmentProcessor(const GrFPArgs&) const override; 53fe17456d5e528078ce69b5f15cf7adf1fab963fandroid-build-team Robot#endif 54fe17456d5e528078ce69b5f15cf7adf1fab963fandroid-build-team Robot bool isOpaque() const override; 55fe17456d5e528078ce69b5f15cf7adf1fab963fandroid-build-team Robot 56fe17456d5e528078ce69b5f15cf7adf1fab963fandroid-build-team Robot SkScalar getCenterX1() const { return SkPoint::Distance(fCenter1, fCenter2); } 57fe17456d5e528078ce69b5f15cf7adf1fab963fandroid-build-team Robot SkScalar getStartRadius() const { return fRadius1; } 58fe17456d5e528078ce69b5f15cf7adf1fab963fandroid-build-team Robot SkScalar getDiffRadius() const { return fRadius2 - fRadius1; } 59fe17456d5e528078ce69b5f15cf7adf1fab963fandroid-build-team Robot const SkPoint& getStartCenter() const { return fCenter1; } 60fe17456d5e528078ce69b5f15cf7adf1fab963fandroid-build-team Robot const SkPoint& getEndCenter() const { return fCenter2; } 61fe17456d5e528078ce69b5f15cf7adf1fab963fandroid-build-team Robot SkScalar getEndRadius() const { return fRadius2; } 62fe17456d5e528078ce69b5f15cf7adf1fab963fandroid-build-team Robot 63fe17456d5e528078ce69b5f15cf7adf1fab963fandroid-build-team Robot Type getType() const { return fType; } 64fe17456d5e528078ce69b5f15cf7adf1fab963fandroid-build-team Robot const SkMatrix& getGradientMatrix() const { return fPtsToUnit; } 65fe17456d5e528078ce69b5f15cf7adf1fab963fandroid-build-team Robot const FocalData& getFocalData() const { return fFocalData; } 66fe17456d5e528078ce69b5f15cf7adf1fab963fandroid-build-team Robot 67fe17456d5e528078ce69b5f15cf7adf1fab963fandroid-build-team Robot SK_TO_STRING_OVERRIDE() 68fe17456d5e528078ce69b5f15cf7adf1fab963fandroid-build-team Robot SK_DECLARE_PUBLIC_FLATTENABLE_DESERIALIZATION_PROCS(SkTwoPointConicalGradient) 69fe17456d5e528078ce69b5f15cf7adf1fab963fandroid-build-team Robot 70fe17456d5e528078ce69b5f15cf7adf1fab963fandroid-build-team Robotprotected: 71fe17456d5e528078ce69b5f15cf7adf1fab963fandroid-build-team Robot void flatten(SkWriteBuffer& buffer) const override; 72fe17456d5e528078ce69b5f15cf7adf1fab963fandroid-build-team Robot sk_sp<SkShader> onMakeColorSpace(SkColorSpaceXformer* xformer) const override; 73fe17456d5e528078ce69b5f15cf7adf1fab963fandroid-build-team Robot 74fe17456d5e528078ce69b5f15cf7adf1fab963fandroid-build-team Robot void appendGradientStages(SkArenaAlloc* alloc, SkRasterPipeline* tPipeline, 75fe17456d5e528078ce69b5f15cf7adf1fab963fandroid-build-team Robot SkRasterPipeline* postPipeline) const override; 76fe17456d5e528078ce69b5f15cf7adf1fab963fandroid-build-team Robot 77fe17456d5e528078ce69b5f15cf7adf1fab963fandroid-build-team Robot bool onIsRasterPipelineOnly(const SkMatrix&) const override { return true; } 78fe17456d5e528078ce69b5f15cf7adf1fab963fandroid-build-team Robot 79fe17456d5e528078ce69b5f15cf7adf1fab963fandroid-build-team Robotprivate: 80fe17456d5e528078ce69b5f15cf7adf1fab963fandroid-build-team Robot SkTwoPointConicalGradient(const SkPoint& c0, SkScalar r0, 81fe17456d5e528078ce69b5f15cf7adf1fab963fandroid-build-team Robot const SkPoint& c1, SkScalar r1, 82fe17456d5e528078ce69b5f15cf7adf1fab963fandroid-build-team Robot const Descriptor&, Type, const SkMatrix&, const FocalData&); 83fe17456d5e528078ce69b5f15cf7adf1fab963fandroid-build-team Robot 84fe17456d5e528078ce69b5f15cf7adf1fab963fandroid-build-team Robot SkPoint fCenter1; 85fe17456d5e528078ce69b5f15cf7adf1fab963fandroid-build-team Robot SkPoint fCenter2; 86fe17456d5e528078ce69b5f15cf7adf1fab963fandroid-build-team Robot SkScalar fRadius1; 87fe17456d5e528078ce69b5f15cf7adf1fab963fandroid-build-team Robot SkScalar fRadius2; 88fe17456d5e528078ce69b5f15cf7adf1fab963fandroid-build-team Robot Type fType; 89fe17456d5e528078ce69b5f15cf7adf1fab963fandroid-build-team Robot 90fe17456d5e528078ce69b5f15cf7adf1fab963fandroid-build-team Robot FocalData fFocalData; 91fe17456d5e528078ce69b5f15cf7adf1fab963fandroid-build-team Robot 92fe17456d5e528078ce69b5f15cf7adf1fab963fandroid-build-team Robot friend class SkGradientShader; 93fe17456d5e528078ce69b5f15cf7adf1fab963fandroid-build-team Robot typedef SkGradientShaderBase INHERITED; 94fe17456d5e528078ce69b5f15cf7adf1fab963fandroid-build-team Robot}; 95fe17456d5e528078ce69b5f15cf7adf1fab963fandroid-build-team Robot 96fe17456d5e528078ce69b5f15cf7adf1fab963fandroid-build-team Robot#endif 97