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      1 /*
      2  * Copyright 2017 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 "SkCanvas.h"
     11 #include "SkGradientShader.h"
     12 #include "SkHighContrastFilter.h"
     13 
     14 using InvertStyle = SkHighContrastConfig::InvertStyle;
     15 
     16 static SkScalar kSize   = 200;
     17 static SkColor  kColor1 = SkColorSetARGB(0xff, 0xff, 0xff, 0);
     18 static SkColor  kColor2 = SkColorSetARGB(0xff, 0x82, 0xff, 0);
     19 
     20 static void draw_label(SkCanvas* canvas, const SkHighContrastConfig& config) {
     21     char labelBuffer[256];
     22     const char* invertStr =
     23         (config.fInvertStyle == InvertStyle::kInvertBrightness ?
     24              "InvBrightness" :
     25             (config.fInvertStyle == InvertStyle::kInvertLightness ?
     26                  "InvLightness" : "NoInvert"));
     27 
     28     snprintf(labelBuffer, sizeof(labelBuffer), "%s%s contrast=%.1f",
     29              config.fGrayscale ? "Gray " : "",
     30              invertStr,
     31              config.fContrast);
     32 
     33     SkPaint paint;
     34     sk_tool_utils::set_portable_typeface(&paint);
     35     paint.setTextSize(0.05f);
     36     size_t len = strlen(labelBuffer);
     37 
     38     SkScalar width = paint.measureText(labelBuffer, len);
     39     canvas->drawText(labelBuffer, len, 0.5f - width / 2, 0.16f, paint);
     40 }
     41 
     42 static void draw_scene(SkCanvas* canvas, const SkHighContrastConfig& config) {
     43     SkRect bounds = SkRect::MakeLTRB(0.0f, 0.0f, 1.0f, 1.0f);
     44     SkPaint xferPaint;
     45     xferPaint.setColorFilter(SkHighContrastFilter::Make(config));
     46     canvas->saveLayer(&bounds, &xferPaint);
     47 
     48     SkPaint paint;
     49     bounds = SkRect::MakeLTRB(0.1f, 0.2f, 0.9f, 0.4f);
     50     paint.setARGB(0xff, 0x66, 0x11, 0x11);
     51     canvas->drawRect(bounds, paint);
     52 
     53     paint.setARGB(0xff, 0xbb, 0x77, 0x77);
     54     paint.setTextSize(0.15f);
     55     canvas->drawText("A", 1, 0.15f, 0.35f, paint);
     56 
     57     bounds = SkRect::MakeLTRB(0.1f, 0.8f, 0.9f, 1.0f);
     58     paint.setARGB(0xff, 0xcc, 0xcc, 0xff);
     59     canvas->drawRect(bounds, paint);
     60 
     61     paint.setARGB(0xff, 0x88, 0x88, 0xbb);
     62     paint.setTextSize(0.15f);
     63     canvas->drawText("Z", 1, 0.75f, 0.95f, paint);
     64 
     65     bounds = SkRect::MakeLTRB(0.1f, 0.4f, 0.9f, 0.6f);
     66     SkPoint     pts[] = { { 0, 0 }, { 1, 0 } };
     67     SkColor     colors[] = { SK_ColorWHITE, SK_ColorBLACK };
     68     SkScalar    pos[] = { 0.2f, 0.8f };
     69     paint.setShader(SkGradientShader::MakeLinear(
     70         pts, colors, pos,
     71         SK_ARRAY_COUNT(colors), SkShader::kClamp_TileMode));
     72     canvas->drawRect(bounds, paint);
     73 
     74     bounds = SkRect::MakeLTRB(0.1f, 0.6f, 0.9f, 0.8f);
     75     SkColor colors2[] = { SK_ColorGREEN, SK_ColorWHITE };
     76     paint.setShader(SkGradientShader::MakeLinear(
     77         pts, colors2, pos,
     78         SK_ARRAY_COUNT(colors2), SkShader::kClamp_TileMode));
     79     canvas->drawRect(bounds, paint);
     80 
     81     canvas->restore();
     82 }
     83 
     84 class HighContrastFilterGM : public skiagm::GM {
     85 public:
     86     HighContrastFilterGM() {
     87         SkColor  g1Colors[] = { kColor1, SkColorSetA(kColor1, 0x20) };
     88         SkColor  g2Colors[] = { kColor2, SkColorSetA(kColor2, 0x20) };
     89         SkPoint  g1Points[] = { { 0, 0 }, { 0,     100 } };
     90         SkPoint  g2Points[] = { { 0, 0 }, { kSize, 0   } };
     91         SkScalar pos[] = { 0.2f, 1.0f };
     92 
     93         SkHighContrastConfig fConfig;
     94         fFilter = SkHighContrastFilter::Make(fConfig);
     95         fGr1 = SkGradientShader::MakeLinear(
     96             g1Points, g1Colors, pos, SK_ARRAY_COUNT(g1Colors),
     97             SkShader::kClamp_TileMode);
     98         fGr2 = SkGradientShader::MakeLinear(
     99             g2Points, g2Colors, pos, SK_ARRAY_COUNT(g2Colors),
    100             SkShader::kClamp_TileMode);
    101     }
    102 
    103 protected:
    104 
    105     SkString onShortName() override {
    106         return SkString("highcontrastfilter");
    107     }
    108 
    109     SkISize onISize() override {
    110         return SkISize::Make(600, 420);
    111     }
    112 
    113     void onDraw(SkCanvas* canvas) override {
    114         SkHighContrastConfig configs[] = {
    115             { false, InvertStyle::kNoInvert, 0.0f },
    116             { false, InvertStyle::kInvertBrightness, 0.0f },
    117             { false, InvertStyle::kInvertLightness, 0.0f },
    118             { false, InvertStyle::kInvertLightness, 0.2f },
    119             { true, InvertStyle::kNoInvert, 0.0f },
    120             { true, InvertStyle::kInvertBrightness, 0.0f },
    121             { true, InvertStyle::kInvertLightness, 0.0f },
    122             { true, InvertStyle::kInvertLightness, 0.2f },
    123         };
    124 
    125         for (size_t i = 0; i < SK_ARRAY_COUNT(configs); ++i) {
    126             SkScalar x = kSize * (i % 4);
    127             SkScalar y = kSize * (i / 4);
    128             canvas->save();
    129             canvas->translate(x, y);
    130             canvas->scale(kSize, kSize);
    131             draw_scene(canvas, configs[i]);
    132             draw_label(canvas, configs[i]);
    133             canvas->restore();
    134         }
    135     }
    136 
    137 private:
    138     sk_sp<SkColorFilter>    fFilter;
    139     sk_sp<SkShader>         fGr1, fGr2;
    140 
    141     typedef skiagm::GM INHERITED;
    142 };
    143 
    144 DEF_GM(return new HighContrastFilterGM;)
    145