1/* 2 * Copyright 2013 Google Inc. 3 * 4 * Use of this source code is governed by a BSD-style license that can be 5 * found in the LICENSE file. 6 */ 7 8#include "gm/gm.h" 9#include "include/core/SkCanvas.h" 10#include "include/core/SkColor.h" 11#include "include/core/SkPaint.h" 12#include "include/core/SkPoint.h" 13#include "include/core/SkRect.h" 14#include "include/core/SkRefCnt.h" 15#include "include/core/SkShader.h" 16#include "include/core/SkSize.h" 17#include "include/core/SkString.h" 18#include "include/core/SkTileMode.h" 19#include "include/core/SkTypes.h" 20#include "include/effects/SkGradientShader.h" 21 22typedef sk_sp<SkShader> (*MakeShaderProc)(const SkColor[], int count, const SkSize&); 23 24static sk_sp<SkShader> shader_linear(const SkColor colors[], int count, const SkSize& size) { 25 SkPoint pts[] = { { 0, 0 }, { size.width(), size.height() } }; 26 return SkGradientShader::MakeLinear(pts, colors, nullptr, count, SkTileMode::kClamp); 27} 28 29static sk_sp<SkShader> shader_radial(const SkColor colors[], int count, const SkSize& size) { 30 SkPoint center = { size.width()/2, size.height()/2 }; 31 return SkGradientShader::MakeRadial(center, size.width()/2, colors, nullptr, count, 32 SkTileMode::kClamp); 33} 34 35static sk_sp<SkShader> shader_conical(const SkColor colors[], int count, const SkSize& size) { 36 SkPoint center = { size.width()/2, size.height()/2 }; 37 return SkGradientShader::MakeTwoPointConical(center, size.width()/64, center, size.width()/2, 38 colors, nullptr, count, SkTileMode::kClamp); 39} 40 41static sk_sp<SkShader> shader_sweep(const SkColor colors[], int count, const SkSize& size) { 42 return SkGradientShader::MakeSweep(size.width()/2, size.height()/2, colors, nullptr, count); 43} 44 45class ShallowGradientGM : public skiagm::GM { 46public: 47 ShallowGradientGM(MakeShaderProc proc, const char name[], bool dither) 48 : fProc(proc), fName(name), fDither(dither) {} 49 50private: 51 MakeShaderProc fProc; 52 const char* fName; 53 bool fDither; 54 55 SkString onShortName() override { 56 return SkStringPrintf("shallow_gradient_%s%s", fName, fDither ? "" : "_nodither"); 57 } 58 59 SkISize onISize() override { return {800, 800}; } 60 61 void onDraw(SkCanvas* canvas) override { 62 const SkColor colors[] = { 0xFF555555, 0xFF444444 }; 63 const int colorCount = SK_ARRAY_COUNT(colors); 64 65 SkRect r = { 0, 0, this->width(), this->height() }; 66 SkSize size = SkSize::Make(r.width(), r.height()); 67 68 SkPaint paint; 69 paint.setShader(fProc(colors, colorCount, size)); 70 paint.setDither(fDither); 71 canvas->drawRect(r, paint); 72 } 73}; 74 75/////////////////////////////////////////////////////////////////////////////// 76 77#define M(PROC, DITHER) DEF_GM( return new ShallowGradientGM(shader_ ## PROC, #PROC, DITHER); ) 78M(linear, true) 79M(radial, true) 80M(conical, true) 81M(sweep, true) 82 83M(linear, false) 84M(radial, false) 85M(conical, false) 86M(sweep, false) 87#undef M 88