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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 "sk_tool_utils.h"
     10 #include "SkGradientShader.h"
     11 
     12 typedef sk_sp<SkShader> (*MakeShaderProc)(const SkColor[], int count, const SkSize&);
     13 
     14 static sk_sp<SkShader> shader_linear(const SkColor colors[], int count, const SkSize& size) {
     15     SkPoint pts[] = { { 0, 0 }, { size.width(), size.height() } };
     16     return SkGradientShader::MakeLinear(pts, colors, nullptr, count, SkShader::kClamp_TileMode);
     17 }
     18 
     19 static sk_sp<SkShader> shader_radial(const SkColor colors[], int count, const SkSize& size) {
     20     SkPoint center = { size.width()/2, size.height()/2 };
     21     return SkGradientShader::MakeRadial(center, size.width()/2, colors, nullptr, count,
     22                                         SkShader::kClamp_TileMode);
     23 }
     24 
     25 static sk_sp<SkShader> shader_conical(const SkColor colors[], int count, const SkSize& size) {
     26     SkPoint center = { size.width()/2, size.height()/2 };
     27     return SkGradientShader::MakeTwoPointConical(center, size.width()/64, center, size.width()/2,
     28                                                 colors, nullptr, count, SkShader::kClamp_TileMode);
     29 }
     30 
     31 static sk_sp<SkShader> shader_sweep(const SkColor colors[], int count, const SkSize& size) {
     32     return SkGradientShader::MakeSweep(size.width()/2, size.height()/2, colors, nullptr, count);
     33 }
     34 
     35 class ShallowGradientGM : public skiagm::GM {
     36 public:
     37     ShallowGradientGM(MakeShaderProc proc, const char name[], bool dither)
     38         : fProc(proc)
     39         , fDither(dither) {
     40         fName.printf("shallow_gradient_%s", name);
     41     }
     42 
     43 protected:
     44 
     45     SkString onShortName() override {
     46         return fName;
     47     }
     48 
     49     SkISize onISize() override {
     50         return SkISize::Make(800, 800);
     51     }
     52 
     53     void onDraw(SkCanvas* canvas) override {
     54         const SkColor colors[] = { sk_tool_utils::color_to_565(0xFF555555),
     55                 sk_tool_utils::color_to_565(0xFF444444) };
     56         const int colorCount = SK_ARRAY_COUNT(colors);
     57 
     58         SkRect r = { 0, 0, this->width(), this->height() };
     59         SkSize size = SkSize::Make(r.width(), r.height());
     60 
     61         SkPaint paint;
     62         paint.setShader(fProc(colors, colorCount, size));
     63         paint.setDither(fDither);
     64         canvas->drawRect(r, paint);
     65     }
     66 
     67 private:
     68     MakeShaderProc fProc;
     69     SkString fName;
     70     bool fDither;
     71 
     72     typedef skiagm::GM INHERITED;
     73 };
     74 
     75 ///////////////////////////////////////////////////////////////////////////////
     76 
     77 DEF_GM( return new ShallowGradientGM(shader_linear, "linear", true); )
     78 DEF_GM( return new ShallowGradientGM(shader_radial, "radial", true); )
     79 DEF_GM( return new ShallowGradientGM(shader_conical, "conical", true); )
     80 DEF_GM( return new ShallowGradientGM(shader_sweep, "sweep", true); )
     81 
     82 DEF_GM( return new ShallowGradientGM(shader_linear, "linear_nodither", false); )
     83 DEF_GM( return new ShallowGradientGM(shader_radial, "radial_nodither", false); )
     84 DEF_GM( return new ShallowGradientGM(shader_conical, "conical_nodither", false); )
     85 DEF_GM( return new ShallowGradientGM(shader_sweep, "sweep_nodither", false); )
     86