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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 SkShader* (*MakeShaderProc)(const SkColor[], int count, const SkSize&);
     12 
     13 static SkShader* shader_linear(const SkColor colors[], int count, const SkSize& size) {
     14     SkPoint pts[] = { { 0, 0 }, { size.width(), size.height() } };
     15     return SkGradientShader::CreateLinear(pts, colors, NULL, count,
     16                                           SkShader::kClamp_TileMode);
     17 }
     18 
     19 static SkShader* shader_radial(const SkColor colors[], int count, const SkSize& size) {
     20     SkPoint center = { size.width()/2, size.height()/2 };
     21     return SkGradientShader::CreateRadial(center, size.width()/2, colors, NULL, count,
     22                                           SkShader::kClamp_TileMode);
     23 }
     24 
     25 static SkShader* shader_conical(const SkColor colors[], int count, const SkSize& size) {
     26     SkPoint center = { size.width()/2, size.height()/2 };
     27     return SkGradientShader::CreateTwoPointConical(center, size.width()/64,
     28                                                    center, size.width()/2,
     29                                                    colors, NULL, count,
     30                                                    SkShader::kClamp_TileMode);
     31 }
     32 
     33 static SkShader* shader_sweep(const SkColor colors[], int count, const SkSize& size) {
     34     return SkGradientShader::CreateSweep(size.width()/2, size.height()/2,
     35                                          colors, NULL, count);
     36 }
     37 
     38 class ShallowGradientGM : public skiagm::GM {
     39 public:
     40     ShallowGradientGM(MakeShaderProc proc, const char name[]) : fProc(proc) {
     41         fName.printf("shallow_gradient_%s", name);
     42     }
     43 
     44 protected:
     45     virtual uint32_t onGetFlags() const SK_OVERRIDE {
     46         if (fName.contains("linear") || fName.contains("radial")) {
     47             return kSkipTiled_Flag;
     48         }
     49         return 0;
     50     }
     51 
     52     virtual SkString onShortName() SK_OVERRIDE {
     53         return fName;
     54     }
     55 
     56     virtual SkISize onISize() SK_OVERRIDE {
     57         return SkISize::Make(800, 800);
     58     }
     59 
     60     virtual void onDraw(SkCanvas* canvas) SK_OVERRIDE {
     61         const SkColor colors[] = { 0xFF555555, 0xFF444444 };
     62         const int colorCount = SK_ARRAY_COUNT(colors);
     63 
     64         SkRect r = { 0, 0, this->width(), this->height() };
     65         SkSize size = SkSize::Make(r.width(), r.height());
     66 
     67         SkPaint paint;
     68         paint.setShader(fProc(colors, colorCount, size))->unref();
     69         canvas->drawRect(r, paint);
     70     }
     71 
     72 private:
     73     MakeShaderProc fProc;
     74     SkString fName;
     75 
     76     typedef skiagm::GM INHERITED;
     77 };
     78 
     79 ///////////////////////////////////////////////////////////////////////////////
     80 
     81 DEF_GM( return new ShallowGradientGM(shader_linear, "linear"); )
     82 DEF_GM( return new ShallowGradientGM(shader_radial, "radial"); )
     83 DEF_GM( return new ShallowGradientGM(shader_conical, "conical"); )
     84 DEF_GM( return new ShallowGradientGM(shader_sweep, "sweep"); )
     85