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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 #include "gm.h"
      8 #include "sk_tool_utils.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 constexpr 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 //constexpr SkScalar gPos[] = { SK_Scalar1*999/2000, SK_Scalar1*1001/2000 };
     31 
     32 constexpr GradData gGradData[] = {
     33     { 40, gColors, nullptr },
     34     //  { 2, gColors, gPos },
     35     //  { 2, gCol2, nullptr },
     36 };
     37 
     38 static sk_sp<SkShader> MakeLinear(const SkPoint pts[2], const GradData& data, SkShader::TileMode tm) {
     39     return SkGradientShader::MakeLinear(pts, data.fColors, data.fPos, data.fCount, tm);
     40 }
     41 
     42 static sk_sp<SkShader> MakeRadial(const SkPoint pts[2], const GradData& data, SkShader::TileMode tm) {
     43     const SkPoint pt{ SkScalarAve(pts[0].fX, pts[1].fX), SkScalarAve(pts[0].fY, pts[1].fY) };
     44     return SkGradientShader::MakeRadial(pt, pt.fX, data.fColors, data.fPos, data.fCount, tm);
     45 }
     46 
     47 static sk_sp<SkShader> MakeSweep(const SkPoint pts[2], const GradData& data, SkShader::TileMode) {
     48     const SkPoint pt{ SkScalarAve(pts[0].fX, pts[1].fX), SkScalarAve(pts[0].fY, pts[1].fY) };
     49     return SkGradientShader::MakeSweep(pt.fX, pt.fY, data.fColors, data.fPos, data.fCount);
     50 }
     51 
     52 
     53 typedef sk_sp<SkShader> (*GradMaker)(const SkPoint pts[2], const GradData&, SkShader::TileMode);
     54 
     55 constexpr GradMaker gGradMakers[] = {
     56     MakeLinear, MakeRadial, MakeSweep,
     57 };
     58 
     59 ///////////////////////////////////////////////////////////////////////////////
     60 
     61 class GradientsGM : public GM {
     62 public:
     63     GradientsGM() {
     64         this->setBGColor(sk_tool_utils::color_to_565(0xFFDDDDDD));
     65     }
     66 
     67 protected:
     68     SkString onShortName() override { return SkString("gradient_dirty_laundry"); }
     69     SkISize onISize() override { return SkISize::Make(640, 615); }
     70 
     71     void onDraw(SkCanvas* canvas) override {
     72         SkPoint pts[2] = { { 0, 0 },
     73                            { SkIntToScalar(100), SkIntToScalar(100) }
     74         };
     75         SkShader::TileMode tm = SkShader::kClamp_TileMode;
     76         SkRect r = { 0, 0, SkIntToScalar(100), SkIntToScalar(100) };
     77         SkPaint paint;
     78         paint.setAntiAlias(true);
     79 
     80         canvas->translate(SkIntToScalar(20), SkIntToScalar(20));
     81         for (size_t i = 0; i < SK_ARRAY_COUNT(gGradData); i++) {
     82             canvas->save();
     83             for (size_t j = 0; j < SK_ARRAY_COUNT(gGradMakers); j++) {
     84                 paint.setShader(gGradMakers[j](pts, gGradData[i], tm));
     85                 canvas->drawRect(r, paint);
     86                 canvas->translate(0, SkIntToScalar(120));
     87             }
     88             canvas->restore();
     89             canvas->translate(SkIntToScalar(120), 0);
     90         }
     91     }
     92 
     93 private:
     94     typedef GM INHERITED;
     95 };
     96 
     97 ///////////////////////////////////////////////////////////////////////////////
     98 
     99 static GM* MyFactory(void*) { return new GradientsGM; }
    100 static GMRegistry reg(MyFactory);
    101