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      1 /*
      2  * Copyright 2016 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 "SkColor.h"
     10 #include "SkColorSpace_Base.h"
     11 #include "SkColorSpaceXform.h"
     12 #include "SkRect.h"
     13 
     14 class ColorSpaceXformGM : public skiagm::GM {
     15 public:
     16     ColorSpaceXformGM() {}
     17 
     18 protected:
     19     void onOnceBeforeDraw() override {
     20         SkColor colors[] = {
     21             SK_ColorRED, SK_ColorGREEN, SK_ColorBLUE, SK_ColorMAGENTA, SK_ColorCYAN, SK_ColorYELLOW,
     22             SK_ColorRED, SK_ColorGREEN, SK_ColorBLUE, SK_ColorMAGENTA,
     23         };
     24         static_assert(kNumColors == SK_ARRAY_COUNT(colors), "Fix number of colors.");
     25 
     26         for (int i = 0; i < kNumColors; i++) {
     27             fSRGBColors[i] = SkColor4f::FromColor(colors[i]);
     28         }
     29 
     30         static constexpr float kWideGamutRGB_toXYZD50[]{
     31             0.7161046f, 0.1009296f, 0.1471858f,
     32             0.2581874f, 0.7249378f, 0.0168748f,
     33             0.0000000f, 0.0517813f, 0.7734287f,
     34         };
     35 
     36         SkMatrix44 wideGamut(SkMatrix44::kUninitialized_Constructor);
     37         wideGamut.set3x3RowMajorf(kWideGamutRGB_toXYZD50);
     38 
     39         // Test BGRA input.
     40         sk_sp<SkColorSpace> srcSpace = SkColorSpace::MakeSRGB();
     41         sk_sp<SkColorSpace> dstSpace =
     42                 SkColorSpace::MakeRGB(SkColorSpace::kLinear_RenderTargetGamma, wideGamut);
     43         std::unique_ptr<SkColorSpaceXform> xform = SkColorSpaceXform::New(srcSpace.get(),
     44                                                                           dstSpace.get());
     45         xform->apply(SkColorSpaceXform::kRGBA_F32_ColorFormat, fWideGamutColors0,
     46                      SkColorSpaceXform::kBGRA_8888_ColorFormat, colors, kNumColors,
     47                      kOpaque_SkAlphaType);
     48 
     49         // Test F32 input.
     50         srcSpace = as_CSB(srcSpace)->makeLinearGamma();
     51         xform = SkColorSpaceXform::New(srcSpace.get(), dstSpace.get());
     52         xform->apply(SkColorSpaceXform::kRGBA_F32_ColorFormat, fWideGamutColors1,
     53                      SkColorSpaceXform::kRGBA_F32_ColorFormat, fSRGBColors, kNumColors,
     54                      kOpaque_SkAlphaType);
     55     }
     56 
     57     SkString onShortName() override {
     58         return SkString("colorspacexform");
     59     }
     60 
     61     SkISize onISize() override {
     62         return SkISize::Make(500, 300);
     63     }
     64 
     65     void onDraw(SkCanvas* canvas) override {
     66         auto drawColors = [canvas](SkColor4f* colors) {
     67             SkRect r = SkRect::MakeXYWH(0.0f, 0.0f, 50.0f, 100.0f);
     68 
     69             canvas->save();
     70             for (int i = 0; i < kNumColors; i++) {
     71                 auto space = SkColorSpace::MakeSRGBLinear();
     72                 sk_sp<SkShader> s = SkShader::MakeColorShader(colors[i], space);
     73                 SkPaint paint;
     74                 paint.setShader(s);
     75                 canvas->drawRect(r, paint);
     76                 canvas->translate(50.0f, 0.0f);
     77             }
     78             canvas->restore();
     79         };
     80 
     81         // Wide gamut colors should appear darker - we are simulating a more intense display.
     82         drawColors(fSRGBColors);
     83         canvas->translate(0.0f, 100.0f);
     84         drawColors(fWideGamutColors0);
     85         canvas->translate(0.0f, 100.0f);
     86         drawColors(fWideGamutColors1);
     87     }
     88 
     89 private:
     90     static constexpr int kNumColors = 10;
     91 
     92     SkColor4f fSRGBColors[kNumColors];
     93     SkColor4f fWideGamutColors0[kNumColors];
     94     SkColor4f fWideGamutColors1[kNumColors];
     95 
     96     typedef skiagm::GM INHERITED;
     97 };
     98 
     99 DEF_GM(return new ColorSpaceXformGM;)
    100