gm/gradientDirtyLaundry.cpp

   1
   2 /*
   3  * Copyright 2013 Google Inc.
   4  *
   5  * Use of this source code is governed by a BSD-style license that can be
   6  * found in the LICENSE file.
   7  */
   8 #include "gm.h"
   9 #include "SkGradientShader.h"
  10
  11 using namespace skiagm;
  12
  13 struct GradData {
  14     int             fCount;
  15     const SkColor*  fColors;
  16     const SkScalar* fPos;
  17 };
  18
  19 static const SkColor gColors[] = {
  20     SK_ColorRED, SK_ColorGREEN, SK_ColorBLUE, SK_ColorWHITE, SK_ColorBLACK,
  21     SK_ColorRED, SK_ColorGREEN, SK_ColorBLUE, SK_ColorWHITE, SK_ColorBLACK,
  22     SK_ColorRED, SK_ColorGREEN, SK_ColorBLUE, SK_ColorWHITE, SK_ColorBLACK,
  23     SK_ColorRED, SK_ColorGREEN, SK_ColorBLUE, SK_ColorWHITE, SK_ColorBLACK,
  24     SK_ColorRED, SK_ColorGREEN, SK_ColorBLUE, SK_ColorWHITE, SK_ColorBLACK,
  25     SK_ColorRED, SK_ColorGREEN, SK_ColorBLUE, SK_ColorWHITE, SK_ColorBLACK,
  26     SK_ColorRED, SK_ColorGREEN, SK_ColorBLUE, SK_ColorWHITE, SK_ColorBLACK,
  27     SK_ColorRED, SK_ColorGREEN, SK_ColorBLUE, SK_ColorWHITE, SK_ColorBLACK,
  28 };
  29
  30 //static const SkScalar gPos[] = { SK_Scalar1*999/2000, SK_Scalar1*1001/2000 };
  31
  32 static const GradData gGradData[] = {
  33     { 40, gColors, NULL },
  34     //  { 2, gColors, gPos },
  35     //  { 2, gCol2, NULL },
  36 };
  37
  38 static SkShader* MakeLinear(const SkPoint pts[2], const GradData& data, SkShader::TileMode tm) {
  39     return SkGradientShader::CreateLinear(pts, data.fColors, data.fPos, data.fCount, tm);
  40 }
  41
  42 static SkShader* MakeRadial(const SkPoint pts[2], const GradData& data, SkShader::TileMode tm) {
  43     SkPoint center;
  44     center.set(SkScalarAve(pts[0].fX, pts[1].fX),
  45                SkScalarAve(pts[0].fY, pts[1].fY));
  46     return SkGradientShader::CreateRadial(center, center.fX, data.fColors,
  47                                           data.fPos, data.fCount, tm);
  48 }
  49
  50 static SkShader* MakeSweep(const SkPoint pts[2], const GradData& data, SkShader::TileMode) {
  51     SkPoint center;
  52     center.set(SkScalarAve(pts[0].fX, pts[1].fX),
  53                SkScalarAve(pts[0].fY, pts[1].fY));
  54     return SkGradientShader::CreateSweep(center.fX, center.fY, data.fColors, data.fPos, data.fCount);
  55 }
  56
  57
  58 typedef SkShader* (*GradMaker)(const SkPoint pts[2], const GradData& data, SkShader::TileMode tm);
  59
  60 static const GradMaker gGradMakers[] = {
  61     MakeLinear, MakeRadial, MakeSweep,
  62 };
  63
  64 ///////////////////////////////////////////////////////////////////////////////
  65
  66 class GradientsGM : public GM {
  67 public:
  68     GradientsGM() {
  69         this->setBGColor(0xFFDDDDDD);
  70     }
  71
  72 protected:
  73     SkString onShortName() SK_OVERRIDE { return SkString("gradient_dirty_laundry"); }
  74     SkISize onISize() SK_OVERRIDE { return SkISize::Make(640, 615); }
  75
  76     void onDraw(SkCanvas* canvas) SK_OVERRIDE {
  77         SkPoint pts[2] = { { 0, 0 },
  78                            { SkIntToScalar(100), SkIntToScalar(100) }
  79         };
  80         SkShader::TileMode tm = SkShader::kClamp_TileMode;
  81         SkRect r = { 0, 0, SkIntToScalar(100), SkIntToScalar(100) };
  82         SkPaint paint;
  83         paint.setAntiAlias(true);
  84
  85         canvas->translate(SkIntToScalar(20), SkIntToScalar(20));
  86         for (size_t i = 0; i < SK_ARRAY_COUNT(gGradData); i++) {
  87             canvas->save();
  88             for (size_t j = 0; j < SK_ARRAY_COUNT(gGradMakers); j++) {
  89                 SkShader* shader = gGradMakers[j](pts, gGradData[i], tm);
  90                 paint.setShader(shader)->unref();
  91                 canvas->drawRect(r, paint);
  92                 canvas->translate(0, SkIntToScalar(120));
  93             }
  94             canvas->restore();
  95             canvas->translate(SkIntToScalar(120), 0);
  96         }
  97     }
  98
  99 private:
 100     typedef GM INHERITED;
 101 };
 102
 103 ///////////////////////////////////////////////////////////////////////////////
 104
 105 static GM* MyFactory(void*) { return new GradientsGM; }
 106 static GMRegistry reg(MyFactory);