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 SkImage* make_atlas(SkCanvas* caller, int atlasSize) {
  19     const int kBlockSize = atlasSize/2;
  20
  21     SkImageInfo info = SkImageInfo::MakeN32Premul(atlasSize, atlasSize);
  22     SkAutoTUnref<SkSurface> surface(caller->newSurface(info));
  23     if (NULL == surface) {
  24         surface.reset(SkSurface::NewRaster(info));
  25     }
  26     SkCanvas* canvas = surface->getCanvas();
  27
  28     SkPaint paint;
  29     paint.setXfermode(SkXfermode::Create(SkXfermode::kSrc_Mode));
  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->newImageSnapshot();
  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         if (NULL == fAtlas) {
  76             fAtlas.reset(make_atlas(canvas, kAtlasSize));
  77         }
  78
  79         const struct {
  80             SkXfermode::Mode fMode;
  81             const char*      fLabel;
  82         } gModes[] = {
  83             { SkXfermode::kClear_Mode,      "Clear"     },
  84             { SkXfermode::kSrc_Mode,        "Src"       },
  85             { SkXfermode::kDst_Mode,        "Dst"       },
  86             { SkXfermode::kSrcOver_Mode,    "SrcOver"   },
  87             { SkXfermode::kDstOver_Mode,    "DstOver"   },
  88             { SkXfermode::kSrcIn_Mode,      "SrcIn"     },
  89             { SkXfermode::kDstIn_Mode,      "DstIn"     },
  90             { SkXfermode::kSrcOut_Mode,     "SrcOut"    },
  91             { SkXfermode::kDstOut_Mode,     "DstOut"    },
  92             { SkXfermode::kSrcATop_Mode,    "SrcATop"   },
  93             { SkXfermode::kDstATop_Mode,    "DstATop"   },
  94             { SkXfermode::kXor_Mode,        "Xor"       },
  95             { SkXfermode::kPlus_Mode,       "Plus"      },
  96             { SkXfermode::kModulate_Mode,   "Mod"       },
  97             { SkXfermode::kScreen_Mode,     "Screen"    },
  98             { SkXfermode::kOverlay_Mode,    "Overlay"   },
  99             { SkXfermode::kDarken_Mode,     "Darken"    },
 100             { SkXfermode::kLighten_Mode,    "Lighten"   },
 101             { SkXfermode::kColorDodge_Mode, "Dodge"     },
 102             { SkXfermode::kColorBurn_Mode,  "Burn"      },
 103             { SkXfermode::kHardLight_Mode,  "Hard"      },
 104             { SkXfermode::kSoftLight_Mode,  "Soft"      },
 105             { SkXfermode::kDifference_Mode, "Diff"      },
 106             { SkXfermode::kExclusion_Mode,  "Exclusion" },
 107             { SkXfermode::kMultiply_Mode,   "Multiply"  },
 108             { SkXfermode::kHue_Mode,        "Hue"       },
 109             { SkXfermode::kSaturation_Mode, "Sat"       },
 110             { SkXfermode::kColor_Mode,      "Color"     },
 111             { SkXfermode::kLuminosity_Mode, "Luminosity"},
 112         };
 113
 114         SkColor gColors[] = {
 115             SK_ColorWHITE,
 116             SK_ColorRED,
 117             0x88888888,         // transparent grey
 118             0x88000088          // transparent blue
 119         };
 120
 121         const int numModes = SK_ARRAY_COUNT(gModes);
 122         SkASSERT(numModes == kNumXferModes);
 123         const int numColors = SK_ARRAY_COUNT(gColors);
 124         SkASSERT(numColors == kNumColors);
 125         SkRSXform xforms[numColors];
 126         SkRect rects[numColors];
 127         SkColor quadColors[numColors];
 128
 129         SkPaint paint;
 130         paint.setAntiAlias(true);
 131
 132         for (int i = 0; i < numColors; ++i) {
 133             xforms[i].set(1.0f, 0.0f, SkIntToScalar(kPad), i*(target.width()+kPad));
 134             rects[i] = target;
 135             quadColors[i] = gColors[i];
 136         }
 137
 138         SkPaint textP;
 139         textP.setTextSize(SkIntToScalar(kTextPad));
 140         textP.setAntiAlias(true);
 141         sk_tool_utils::set_portable_typeface(&textP, NULL);
 142
 143         for (int i = 0; i < numModes; ++i) {
 144             canvas->drawText(gModes[i].fLabel, strlen(gModes[i].fLabel),
 145                              i*(target.width()+kPad)+kPad, SkIntToScalar(kTextPad),
 146                              textP);
 147         }
 148
 149         for (int i = 0; i < numModes; ++i) {
 150             canvas->save();
 151             canvas->translate(SkIntToScalar(i*(target.height()+kPad)),
 152                               SkIntToScalar(kTextPad+kPad));
 153             // w/o a paint
 154             canvas->drawAtlas(fAtlas, xforms, rects, quadColors, numColors,
 155                               gModes[i].fMode, NULL, NULL);
 156             canvas->translate(0.0f, numColors*(target.height()+kPad));
 157             // w a paint
 158             canvas->drawAtlas(fAtlas, xforms, rects, quadColors, numColors,
 159                               gModes[i].fMode, NULL, &paint);
 160             canvas->restore();
 161         }
 162     }
 163
 164 private:
 165     static const int kNumXferModes = 29;
 166     static const int kNumColors = 4;
 167     static const int kAtlasSize = 30;
 168     static const int kPad = 2;
 169     static const int kTextPad = 8;
 170
 171
 172     SkAutoTUnref<SkImage> fAtlas;
 173
 174     typedef GM INHERITED;
 175 };
 176 DEF_GM( return new DrawAtlasColorsGM; )
 177