gm/xfermodeimagefilter.cpp

   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
   8 #include "gm.h"
   9 #include "sk_tool_utils.h"
  10 #include "SkImage.h"
  11 #include "SkImageSource.h"
  12 #include "SkOffsetImageFilter.h"
  13 #include "SkXfermodeImageFilter.h"
  14
  15 #define WIDTH 600
  16 #define HEIGHT 700
  17 #define MARGIN 12
  18
  19 namespace skiagm {
  20
  21 class XfermodeImageFilterGM : public GM {
  22 public:
  23     XfermodeImageFilterGM(){
  24         this->setBGColor(0xFF000000);
  25     }
  26
  27 protected:
  28     SkString onShortName() override {
  29         return SkString("xfermodeimagefilter");
  30     }
  31
  32     SkISize onISize() override {
  33         return SkISize::Make(WIDTH, HEIGHT);
  34     }
  35
  36     void onOnceBeforeDraw() override {
  37         fBitmap = sk_tool_utils::create_string_bitmap(80, 80, 0xD000D000, 15, 65, 96, "e");
  38
  39         fCheckerboard = SkImage::MakeFromBitmap(
  40             sk_tool_utils::create_checkerboard_bitmap(80, 80,
  41                                                       sk_tool_utils::color_to_565(0xFFA0A0A0),
  42                                                       sk_tool_utils::color_to_565(0xFF404040),
  43                                                       8));
  44     }
  45
  46     void onDraw(SkCanvas* canvas) override {
  47         canvas->clear(SK_ColorBLACK);
  48         SkPaint paint;
  49
  50         const struct {
  51             SkXfermode::Mode  fMode;
  52             const char*         fLabel;
  53         } gModes[] = {
  54             { SkXfermode::kClear_Mode,    "Clear"     },
  55             { SkXfermode::kSrc_Mode,      "Src"       },
  56             { SkXfermode::kDst_Mode,      "Dst"       },
  57             { SkXfermode::kSrcOver_Mode,  "SrcOver"   },
  58             { SkXfermode::kDstOver_Mode,  "DstOver"   },
  59             { SkXfermode::kSrcIn_Mode,    "SrcIn"     },
  60             { SkXfermode::kDstIn_Mode,    "DstIn"     },
  61             { SkXfermode::kSrcOut_Mode,   "SrcOut"    },
  62             { SkXfermode::kDstOut_Mode,   "DstOut"    },
  63             { SkXfermode::kSrcATop_Mode,  "SrcATop"   },
  64             { SkXfermode::kDstATop_Mode,  "DstATop"   },
  65             { SkXfermode::kXor_Mode,      "Xor"       },
  66
  67             { SkXfermode::kPlus_Mode,         "Plus"          },
  68             { SkXfermode::kModulate_Mode,     "Modulate"      },
  69             { SkXfermode::kScreen_Mode,       "Screen"        },
  70             { SkXfermode::kOverlay_Mode,      "Overlay"       },
  71             { SkXfermode::kDarken_Mode,       "Darken"        },
  72             { SkXfermode::kLighten_Mode,      "Lighten"       },
  73             { SkXfermode::kColorDodge_Mode,   "ColorDodge"    },
  74             { SkXfermode::kColorBurn_Mode,    "ColorBurn"     },
  75             { SkXfermode::kHardLight_Mode,    "HardLight"     },
  76             { SkXfermode::kSoftLight_Mode,    "SoftLight"     },
  77             { SkXfermode::kDifference_Mode,   "Difference"    },
  78             { SkXfermode::kExclusion_Mode,    "Exclusion"     },
  79             { SkXfermode::kMultiply_Mode,     "Multiply"      },
  80             { SkXfermode::kHue_Mode,          "Hue"           },
  81             { SkXfermode::kSaturation_Mode,   "Saturation"    },
  82             { SkXfermode::kColor_Mode,        "Color"         },
  83             { SkXfermode::kLuminosity_Mode,   "Luminosity"    },
  84         };
  85
  86         int x = 0, y = 0;
  87         sk_sp<SkImageFilter> background(SkImageSource::Make(fCheckerboard));
  88         for (size_t i = 0; i < SK_ARRAY_COUNT(gModes); i++) {
  89             paint.setImageFilter(SkXfermodeImageFilter::Make(SkXfermode::Make(gModes[i].fMode),
  90                                                              background));
  91             DrawClippedBitmap(canvas, fBitmap, paint, x, y);
  92             x += fBitmap.width() + MARGIN;
  93             if (x + fBitmap.width() > WIDTH) {
  94                 x = 0;
  95                 y += fBitmap.height() + MARGIN;
  96             }
  97         }
  98         // Test arithmetic mode as image filter
  99         paint.setImageFilter(SkXfermodeImageFilter::MakeArithmetic(0, 1, 1, 0, true, background));
 100         DrawClippedBitmap(canvas, fBitmap, paint, x, y);
 101         x += fBitmap.width() + MARGIN;
 102         if (x + fBitmap.width() > WIDTH) {
 103             x = 0;
 104             y += fBitmap.height() + MARGIN;
 105         }
 106         // Test nullptr mode
 107         paint.setImageFilter(SkXfermodeImageFilter::Make(nullptr, background));
 108         DrawClippedBitmap(canvas, fBitmap, paint, x, y);
 109         x += fBitmap.width() + MARGIN;
 110         if (x + fBitmap.width() > WIDTH) {
 111             x = 0;
 112             y += fBitmap.height() + MARGIN;
 113         }
 114         SkRect clipRect = SkRect::MakeWH(SkIntToScalar(fBitmap.width() + 4),
 115                                          SkIntToScalar(fBitmap.height() + 4));
 116         // Test offsets on SrcMode (uses fixed-function blend)
 117         sk_sp<SkImage> bitmapImage(SkImage::MakeFromBitmap(fBitmap));
 118         sk_sp<SkImageFilter> foreground(SkImageSource::Make(std::move(bitmapImage)));
 119         sk_sp<SkImageFilter> offsetForeground(SkOffsetImageFilter::Make(SkIntToScalar(4),
 120                                                                         SkIntToScalar(-4),
 121                                                                         foreground));
 122         sk_sp<SkImageFilter> offsetBackground(SkOffsetImageFilter::Make(SkIntToScalar(4),
 123                                                                         SkIntToScalar(4),
 124                                                                         background));
 125         paint.setImageFilter(SkXfermodeImageFilter::Make(
 126                                                      SkXfermode::Make(SkXfermode::kSrcOver_Mode),
 127                                                      offsetBackground,
 128                                                      offsetForeground,
 129                                                      nullptr));
 130         DrawClippedPaint(canvas, clipRect, paint, x, y);
 131         x += fBitmap.width() + MARGIN;
 132         if (x + fBitmap.width() > WIDTH) {
 133             x = 0;
 134             y += fBitmap.height() + MARGIN;
 135         }
 136         // Test offsets on Darken (uses shader blend)
 137         paint.setImageFilter(SkXfermodeImageFilter::Make(SkXfermode::Make(SkXfermode::kDarken_Mode),
 138                                                          offsetBackground,
 139                                                          offsetForeground,
 140                                                          nullptr));
 141         DrawClippedPaint(canvas, clipRect, paint, x, y);
 142         x += fBitmap.width() + MARGIN;
 143         if (x + fBitmap.width() > WIDTH) {
 144             x = 0;
 145             y += fBitmap.height() + MARGIN;
 146         }
 147         // Test cropping
 148         constexpr size_t nbSamples = 3;
 149         SkXfermode::Mode sampledModes[nbSamples] = {SkXfermode::kOverlay_Mode,
 150                                                     SkXfermode::kSrcOver_Mode,
 151                                                     SkXfermode::kPlus_Mode};
 152         int offsets[nbSamples][4] = {{ 10,  10, -16, -16},
 153                                      { 10,  10,  10,  10},
 154                                      {-10, -10,  -6,  -6}};
 155         for (size_t i = 0; i < nbSamples; ++i) {
 156             SkIRect cropRect = SkIRect::MakeXYWH(offsets[i][0],
 157                                                  offsets[i][1],
 158                                                  fBitmap.width()  + offsets[i][2],
 159                                                  fBitmap.height() + offsets[i][3]);
 160             SkImageFilter::CropRect rect(SkRect::Make(cropRect));
 161             paint.setImageFilter(SkXfermodeImageFilter::Make(SkXfermode::Make(sampledModes[i]),
 162                                                              offsetBackground,
 163                                                              offsetForeground,
 164                                                              &rect));
 165             DrawClippedPaint(canvas, clipRect, paint, x, y);
 166             x += fBitmap.width() + MARGIN;
 167             if (x + fBitmap.width() > WIDTH) {
 168                 x = 0;
 169                 y += fBitmap.height() + MARGIN;
 170             }
 171         }
 172         // Test small bg, large fg with Screen (uses shader blend)
 173         auto mode = SkXfermode::Make(SkXfermode::kScreen_Mode);
 174         SkImageFilter::CropRect cropRect(SkRect::MakeXYWH(10, 10, 60, 60));
 175         sk_sp<SkImageFilter> cropped(SkOffsetImageFilter::Make(0, 0, foreground, &cropRect));
 176         paint.setImageFilter(SkXfermodeImageFilter::Make(mode, cropped, background, nullptr));
 177         DrawClippedPaint(canvas, clipRect, paint, x, y);
 178         x += fBitmap.width() + MARGIN;
 179         if (x + fBitmap.width() > WIDTH) {
 180             x = 0;
 181             y += fBitmap.height() + MARGIN;
 182         }
 183         // Test small fg, large bg with Screen (uses shader blend)
 184         paint.setImageFilter(SkXfermodeImageFilter::Make(mode, background, cropped, nullptr));
 185         DrawClippedPaint(canvas, clipRect, paint, x, y);
 186         x += fBitmap.width() + MARGIN;
 187         if (x + fBitmap.width() > WIDTH) {
 188             x = 0;
 189             y += fBitmap.height() + MARGIN;
 190         }
 191         // Test small fg, large bg with SrcIn with a crop that forces it to full size.
 192         // This tests that SkXfermodeImageFilter correctly applies the compositing mode to
 193         // the region outside the foreground.
 194         mode = SkXfermode::Make(SkXfermode::kSrcIn_Mode);
 195         SkImageFilter::CropRect cropRectFull(SkRect::MakeXYWH(0, 0, 80, 80));
 196         paint.setImageFilter(SkXfermodeImageFilter::Make(mode, background,
 197                                                          cropped, &cropRectFull));
 198         DrawClippedPaint(canvas, clipRect, paint, x, y);
 199         x += fBitmap.width() + MARGIN;
 200         if (x + fBitmap.width() > WIDTH) {
 201             x = 0;
 202             y += fBitmap.height() + MARGIN;
 203         }
 204     }
 205
 206 private:
 207     static void DrawClippedBitmap(SkCanvas* canvas, const SkBitmap& bitmap, const SkPaint& paint,
 208                            int x, int y) {
 209         canvas->save();
 210         canvas->translate(SkIntToScalar(x), SkIntToScalar(y));
 211         canvas->clipRect(SkRect::MakeWH(
 212             SkIntToScalar(bitmap.width()), SkIntToScalar(bitmap.height())));
 213         canvas->drawBitmap(bitmap, 0, 0, &paint);
 214         canvas->restore();
 215     }
 216
 217     static void DrawClippedPaint(SkCanvas* canvas, const SkRect& rect, const SkPaint& paint,
 218                           int x, int y) {
 219         canvas->save();
 220         canvas->translate(SkIntToScalar(x), SkIntToScalar(y));
 221         canvas->clipRect(rect);
 222         canvas->drawPaint(paint);
 223         canvas->restore();
 224     }
 225
 226     SkBitmap        fBitmap;
 227     sk_sp<SkImage>  fCheckerboard;
 228
 229     typedef GM INHERITED;
 230 };
 231
 232 //////////////////////////////////////////////////////////////////////////////
 233
 234 DEF_GM( return new XfermodeImageFilterGM; );
 235
 236 }