gm/shallowgradient.cpp

   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); )