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      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.h"
      9 #include "SkGradientShader.h"
     10 
     11 typedef sk_sp<SkShader> (*MakeShaderProc)(const SkColor[], int count, const SkSize&);
     12 
     13 static sk_sp<SkShader> shader_linear(const SkColor colors[], int count, const SkSize& size) {
     14     SkPoint pts[] = { { 0, 0 }, { size.width(), size.height() } };
     15     return SkGradientShader::MakeLinear(pts, colors, nullptr, count, SkShader::kClamp_TileMode);
     16 }
     17 
     18 static sk_sp<SkShader> shader_radial(const SkColor colors[], int count, const SkSize& size) {
     19     SkPoint center = { size.width()/2, size.height()/2 };
     20     return SkGradientShader::MakeRadial(center, size.width()/2, colors, nullptr, count,
     21                                         SkShader::kClamp_TileMode);
     22 }
     23 
     24 static sk_sp<SkShader> shader_conical(const SkColor colors[], int count, const SkSize& size) {
     25     SkPoint center = { size.width()/2, size.height()/2 };
     26     return SkGradientShader::MakeTwoPointConical(center, size.width()/64, center, size.width()/2,
     27                                                 colors, nullptr, count, SkShader::kClamp_TileMode);
     28 }
     29 
     30 static sk_sp<SkShader> shader_sweep(const SkColor colors[], int count, const SkSize& size) {
     31     return SkGradientShader::MakeSweep(size.width()/2, size.height()/2, colors, nullptr, count);
     32 }
     33 
     34 class ShallowGradientGM : public skiagm::GM {
     35 public:
     36     ShallowGradientGM(MakeShaderProc proc, const char name[], bool dither)
     37         : fProc(proc)
     38         , fDither(dither) {
     39         fName.printf("shallow_gradient_%s", name);
     40     }
     41 
     42 protected:
     43 
     44     SkString onShortName() override {
     45         return fName;
     46     }
     47 
     48     SkISize onISize() override {
     49         return SkISize::Make(800, 800);
     50     }
     51 
     52     void onDraw(SkCanvas* canvas) override {
     53         const SkColor colors[] = { 0xFF555555, 0xFF444444 };
     54         const int colorCount = SK_ARRAY_COUNT(colors);
     55 
     56         SkRect r = { 0, 0, this->width(), this->height() };
     57         SkSize size = SkSize::Make(r.width(), r.height());
     58 
     59         SkPaint paint;
     60         paint.setShader(fProc(colors, colorCount, size));
     61         paint.setDither(fDither);
     62         canvas->drawRect(r, paint);
     63     }
     64 
     65 private:
     66     MakeShaderProc fProc;
     67     SkString fName;
     68     bool fDither;
     69 
     70     typedef skiagm::GM INHERITED;
     71 };
     72 
     73 ///////////////////////////////////////////////////////////////////////////////
     74 
     75 DEF_GM( return new ShallowGradientGM(shader_linear, "linear", true); )
     76 DEF_GM( return new ShallowGradientGM(shader_radial, "radial", true); )
     77 DEF_GM( return new ShallowGradientGM(shader_conical, "conical", true); )
     78 DEF_GM( return new ShallowGradientGM(shader_sweep, "sweep", true); )
     79 
     80 DEF_GM( return new ShallowGradientGM(shader_linear, "linear_nodither", false); )
     81 DEF_GM( return new ShallowGradientGM(shader_radial, "radial_nodither", false); )
     82 DEF_GM( return new ShallowGradientGM(shader_conical, "conical_nodither", false); )
     83 DEF_GM( return new ShallowGradientGM(shader_sweep, "sweep_nodither", false); )
     84