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 "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
  46     SkString onShortName() override {
  47         return fName;
  48     }
  49
  50     SkISize onISize() override {
  51         return SkISize::Make(800, 800);
  52     }
  53
  54     void onDraw(SkCanvas* canvas) override {
  55         const SkColor colors[] = { 0xFF555555, 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))->unref();
  63         canvas->drawRect(r, paint);
  64     }
  65
  66 private:
  67     MakeShaderProc fProc;
  68     SkString fName;
  69
  70     typedef skiagm::GM INHERITED;
  71 };
  72
  73 ///////////////////////////////////////////////////////////////////////////////
  74
  75 DEF_GM( return new ShallowGradientGM(shader_linear, "linear"); )
  76 DEF_GM( return new ShallowGradientGM(shader_radial, "radial"); )
  77 DEF_GM( return new ShallowGradientGM(shader_conical, "conical"); )
  78 DEF_GM( return new ShallowGradientGM(shader_sweep, "sweep"); )