gm/drawatlascolor.cpp

   1 /*
   2  * Copyright 2015 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 "SkCanvas.h"
  10 #include "SkRSXform.h"
  11 #include "SkSurface.h"
  12
  13 // Create a square atlas of:
  14 //   opaque white  |     opaque red
  15 //  ------------------------------------
  16 //   opaque green  |  transparent black
  17 //
  18 static sk_sp<SkImage> make_atlas(SkCanvas* caller, int atlasSize) {
  19     const int kBlockSize = atlasSize/2;
  20
  21     SkImageInfo info = SkImageInfo::MakeN32Premul(atlasSize, atlasSize);
  22     auto surface(caller->makeSurface(info));
  23     if (nullptr == surface) {
  24         surface = SkSurface::MakeRaster(info);
  25     }
  26     SkCanvas* canvas = surface->getCanvas();
  27
  28     SkPaint paint;
  29     paint.setBlendMode(SkBlendMode::kSrc);
  30
  31     paint.setColor(SK_ColorWHITE);
  32     SkRect r = SkRect::MakeXYWH(0, 0,
  33                                 SkIntToScalar(kBlockSize), SkIntToScalar(kBlockSize));
  34     canvas->drawRect(r, paint);
  35
  36     paint.setColor(SK_ColorRED);
  37     r = SkRect::MakeXYWH(SkIntToScalar(kBlockSize), 0,
  38                          SkIntToScalar(kBlockSize), SkIntToScalar(kBlockSize));
  39     canvas->drawRect(r, paint);
  40
  41     paint.setColor(SK_ColorGREEN);
  42     r = SkRect::MakeXYWH(0, SkIntToScalar(kBlockSize),
  43                          SkIntToScalar(kBlockSize), SkIntToScalar(kBlockSize));
  44     canvas->drawRect(r, paint);
  45
  46     paint.setColor(SK_ColorTRANSPARENT);
  47     r = SkRect::MakeXYWH(SkIntToScalar(kBlockSize), SkIntToScalar(kBlockSize),
  48                          SkIntToScalar(kBlockSize), SkIntToScalar(kBlockSize));
  49     canvas->drawRect(r, paint);
  50
  51     return surface->makeImageSnapshot();
  52 }
  53
  54 // This GM tests the drawAtlas API with colors, different xfer modes
  55 // and transparency in the atlas image
  56 class DrawAtlasColorsGM : public skiagm::GM {
  57 public:
  58     DrawAtlasColorsGM() {
  59         this->setBGColor(sk_tool_utils::color_to_565(0xFFCCCCCC));
  60     }
  61
  62 protected:
  63     SkString onShortName() override {
  64         return SkString("draw-atlas-colors");
  65     }
  66
  67     SkISize onISize() override {
  68         return SkISize::Make(kNumXferModes * (kAtlasSize + kPad) + kPad,
  69                              2 * kNumColors * (kAtlasSize + kPad) + kTextPad + kPad);
  70     }
  71
  72     void onDraw(SkCanvas* canvas) override {
  73         const SkRect target = SkRect::MakeWH(SkIntToScalar(kAtlasSize), SkIntToScalar(kAtlasSize));
  74
  75         auto atlas = make_atlas(canvas, kAtlasSize);
  76
  77         const struct {
  78             SkBlendMode fMode;
  79             const char* fLabel;
  80         } gModes[] = {
  81             { SkBlendMode::kClear,      "Clear"     },
  82             { SkBlendMode::kSrc,        "Src"       },
  83             { SkBlendMode::kDst,        "Dst"       },
  84             { SkBlendMode::kSrcOver,    "SrcOver"   },
  85             { SkBlendMode::kDstOver,    "DstOver"   },
  86             { SkBlendMode::kSrcIn,      "SrcIn"     },
  87             { SkBlendMode::kDstIn,      "DstIn"     },
  88             { SkBlendMode::kSrcOut,     "SrcOut"    },
  89             { SkBlendMode::kDstOut,     "DstOut"    },
  90             { SkBlendMode::kSrcATop,    "SrcATop"   },
  91             { SkBlendMode::kDstATop,    "DstATop"   },
  92             { SkBlendMode::kXor,        "Xor"       },
  93             { SkBlendMode::kPlus,       "Plus"      },
  94             { SkBlendMode::kModulate,   "Mod"       },
  95             { SkBlendMode::kScreen,     "Screen"    },
  96             { SkBlendMode::kOverlay,    "Overlay"   },
  97             { SkBlendMode::kDarken,     "Darken"    },
  98             { SkBlendMode::kLighten,    "Lighten"   },
  99             { SkBlendMode::kColorDodge, "Dodge"     },
 100             { SkBlendMode::kColorBurn,  "Burn"      },
 101             { SkBlendMode::kHardLight,  "Hard"      },
 102             { SkBlendMode::kSoftLight,  "Soft"      },
 103             { SkBlendMode::kDifference, "Diff"      },
 104             { SkBlendMode::kExclusion,  "Exclusion" },
 105             { SkBlendMode::kMultiply,   "Multiply"  },
 106             { SkBlendMode::kHue,        "Hue"       },
 107             { SkBlendMode::kSaturation, "Sat"       },
 108             { SkBlendMode::kColor,      "Color"     },
 109             { SkBlendMode::kLuminosity, "Luminosity"},
 110         };
 111
 112         SkColor gColors[] = {
 113             SK_ColorWHITE,
 114             SK_ColorRED,
 115             0x88888888,         // transparent grey
 116             0x88000088          // transparent blue
 117         };
 118
 119         const int numModes = SK_ARRAY_COUNT(gModes);
 120         SkASSERT(numModes == kNumXferModes);
 121         const int numColors = SK_ARRAY_COUNT(gColors);
 122         SkASSERT(numColors == kNumColors);
 123         SkRSXform xforms[numColors];
 124         SkRect rects[numColors];
 125         SkColor quadColors[numColors];
 126
 127         SkPaint paint;
 128         paint.setAntiAlias(true);
 129
 130         for (int i = 0; i < numColors; ++i) {
 131             xforms[i].set(1.0f, 0.0f, SkIntToScalar(kPad), i*(target.width()+kPad));
 132             rects[i] = target;
 133             quadColors[i] = gColors[i];
 134         }
 135
 136         SkPaint textP;
 137         textP.setTextSize(SkIntToScalar(kTextPad));
 138         textP.setAntiAlias(true);
 139         sk_tool_utils::set_portable_typeface(&textP, nullptr);
 140
 141         for (int i = 0; i < numModes; ++i) {
 142             canvas->drawText(gModes[i].fLabel, strlen(gModes[i].fLabel),
 143                              i*(target.width()+kPad)+kPad, SkIntToScalar(kTextPad),
 144                              textP);
 145         }
 146
 147         for (int i = 0; i < numModes; ++i) {
 148             canvas->save();
 149             canvas->translate(SkIntToScalar(i*(target.height()+kPad)),
 150                               SkIntToScalar(kTextPad+kPad));
 151             // w/o a paint
 152             canvas->drawAtlas(atlas.get(), xforms, rects, quadColors, numColors,
 153                               gModes[i].fMode, nullptr, nullptr);
 154             canvas->translate(0.0f, numColors*(target.height()+kPad));
 155             // w a paint
 156             canvas->drawAtlas(atlas.get(), xforms, rects, quadColors, numColors,
 157                               gModes[i].fMode, nullptr, &paint);
 158             canvas->restore();
 159         }
 160     }
 161
 162 private:
 163     static constexpr int kNumXferModes = 29;
 164     static constexpr int kNumColors = 4;
 165     static constexpr int kAtlasSize = 30;
 166     static constexpr int kPad = 2;
 167     static constexpr int kTextPad = 8;
 168
 169     typedef GM INHERITED;
 170 };
 171 DEF_GM( return new DrawAtlasColorsGM; )