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             SkBlendMode fMode;
  52             const char* fLabel;
  53         } gModes[] = {
  54             { SkBlendMode::kClear,    "Clear"     },
  55             { SkBlendMode::kSrc,      "Src"       },
  56             { SkBlendMode::kDst,      "Dst"       },
  57             { SkBlendMode::kSrcOver,  "SrcOver"   },
  58             { SkBlendMode::kDstOver,  "DstOver"   },
  59             { SkBlendMode::kSrcIn,    "SrcIn"     },
  60             { SkBlendMode::kDstIn,    "DstIn"     },
  61             { SkBlendMode::kSrcOut,   "SrcOut"    },
  62             { SkBlendMode::kDstOut,   "DstOut"    },
  63             { SkBlendMode::kSrcATop,  "SrcATop"   },
  64             { SkBlendMode::kDstATop,  "DstATop"   },
  65             { SkBlendMode::kXor,      "Xor"       },
  66
  67             { SkBlendMode::kPlus,         "Plus"          },
  68             { SkBlendMode::kModulate,     "Modulate"      },
  69             { SkBlendMode::kScreen,       "Screen"        },
  70             { SkBlendMode::kOverlay,      "Overlay"       },
  71             { SkBlendMode::kDarken,       "Darken"        },
  72             { SkBlendMode::kLighten,      "Lighten"       },
  73             { SkBlendMode::kColorDodge,   "ColorDodge"    },
  74             { SkBlendMode::kColorBurn,    "ColorBurn"     },
  75             { SkBlendMode::kHardLight,    "HardLight"     },
  76             { SkBlendMode::kSoftLight,    "SoftLight"     },
  77             { SkBlendMode::kDifference,   "Difference"    },
  78             { SkBlendMode::kExclusion,    "Exclusion"     },
  79             { SkBlendMode::kMultiply,     "Multiply"      },
  80             { SkBlendMode::kHue,          "Hue"           },
  81             { SkBlendMode::kSaturation,   "Saturation"    },
  82             { SkBlendMode::kColor,        "Color"         },
  83             { SkBlendMode::kLuminosity,   "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(gModes[i].fMode, background));
  90             DrawClippedBitmap(canvas, fBitmap, paint, x, y);
  91             x += fBitmap.width() + MARGIN;
  92             if (x + fBitmap.width() > WIDTH) {
  93                 x = 0;
  94                 y += fBitmap.height() + MARGIN;
  95             }
  96         }
  97         // Test arithmetic mode as image filter
  98         paint.setImageFilter(SkXfermodeImageFilter::MakeArithmetic(0, 1, 1, 0, true, background));
  99         DrawClippedBitmap(canvas, fBitmap, paint, x, y);
 100         x += fBitmap.width() + MARGIN;
 101         if (x + fBitmap.width() > WIDTH) {
 102             x = 0;
 103             y += fBitmap.height() + MARGIN;
 104         }
 105         // Test nullptr mode
 106         paint.setImageFilter(SkXfermodeImageFilter::Make(SkBlendMode::kSrcOver, background));
 107         DrawClippedBitmap(canvas, fBitmap, paint, x, y);
 108         x += fBitmap.width() + MARGIN;
 109         if (x + fBitmap.width() > WIDTH) {
 110             x = 0;
 111             y += fBitmap.height() + MARGIN;
 112         }
 113         SkRect clipRect = SkRect::MakeWH(SkIntToScalar(fBitmap.width() + 4),
 114                                          SkIntToScalar(fBitmap.height() + 4));
 115         // Test offsets on SrcMode (uses fixed-function blend)
 116         sk_sp<SkImage> bitmapImage(SkImage::MakeFromBitmap(fBitmap));
 117         sk_sp<SkImageFilter> foreground(SkImageSource::Make(std::move(bitmapImage)));
 118         sk_sp<SkImageFilter> offsetForeground(SkOffsetImageFilter::Make(SkIntToScalar(4),
 119                                                                         SkIntToScalar(-4),
 120                                                                         foreground));
 121         sk_sp<SkImageFilter> offsetBackground(SkOffsetImageFilter::Make(SkIntToScalar(4),
 122                                                                         SkIntToScalar(4),
 123                                                                         background));
 124         paint.setImageFilter(SkXfermodeImageFilter::Make(SkBlendMode::kSrcOver,
 125                                                          offsetBackground,
 126                                                          offsetForeground,
 127                                                          nullptr));
 128         DrawClippedPaint(canvas, clipRect, paint, x, y);
 129         x += fBitmap.width() + MARGIN;
 130         if (x + fBitmap.width() > WIDTH) {
 131             x = 0;
 132             y += fBitmap.height() + MARGIN;
 133         }
 134         // Test offsets on Darken (uses shader blend)
 135         paint.setImageFilter(SkXfermodeImageFilter::Make(SkBlendMode::kDarken,
 136                                                          offsetBackground,
 137                                                          offsetForeground,
 138                                                          nullptr));
 139         DrawClippedPaint(canvas, clipRect, paint, x, y);
 140         x += fBitmap.width() + MARGIN;
 141         if (x + fBitmap.width() > WIDTH) {
 142             x = 0;
 143             y += fBitmap.height() + MARGIN;
 144         }
 145         // Test cropping
 146         constexpr size_t nbSamples = 3;
 147         const SkBlendMode sampledModes[nbSamples] = {
 148             SkBlendMode::kOverlay, SkBlendMode::kSrcOver, SkBlendMode::kPlus
 149         };
 150         int offsets[nbSamples][4] = {{ 10,  10, -16, -16},
 151                                      { 10,  10,  10,  10},
 152                                      {-10, -10,  -6,  -6}};
 153         for (size_t i = 0; i < nbSamples; ++i) {
 154             SkIRect cropRect = SkIRect::MakeXYWH(offsets[i][0],
 155                                                  offsets[i][1],
 156                                                  fBitmap.width()  + offsets[i][2],
 157                                                  fBitmap.height() + offsets[i][3]);
 158             SkImageFilter::CropRect rect(SkRect::Make(cropRect));
 159             paint.setImageFilter(SkXfermodeImageFilter::Make(sampledModes[i],
 160                                                              offsetBackground,
 161                                                              offsetForeground,
 162                                                              &rect));
 163             DrawClippedPaint(canvas, clipRect, paint, x, y);
 164             x += fBitmap.width() + MARGIN;
 165             if (x + fBitmap.width() > WIDTH) {
 166                 x = 0;
 167                 y += fBitmap.height() + MARGIN;
 168             }
 169         }
 170         // Test small bg, large fg with Screen (uses shader blend)
 171         SkBlendMode mode = SkBlendMode::kScreen;
 172         SkImageFilter::CropRect cropRect(SkRect::MakeXYWH(10, 10, 60, 60));
 173         sk_sp<SkImageFilter> cropped(SkOffsetImageFilter::Make(0, 0, foreground, &cropRect));
 174         paint.setImageFilter(SkXfermodeImageFilter::Make(mode, cropped, background, nullptr));
 175         DrawClippedPaint(canvas, clipRect, paint, x, y);
 176         x += fBitmap.width() + MARGIN;
 177         if (x + fBitmap.width() > WIDTH) {
 178             x = 0;
 179             y += fBitmap.height() + MARGIN;
 180         }
 181         // Test small fg, large bg with Screen (uses shader blend)
 182         paint.setImageFilter(SkXfermodeImageFilter::Make(mode, background, cropped, nullptr));
 183         DrawClippedPaint(canvas, clipRect, paint, x, y);
 184         x += fBitmap.width() + MARGIN;
 185         if (x + fBitmap.width() > WIDTH) {
 186             x = 0;
 187             y += fBitmap.height() + MARGIN;
 188         }
 189         // Test small fg, large bg with SrcIn with a crop that forces it to full size.
 190         // This tests that SkXfermodeImageFilter correctly applies the compositing mode to
 191         // the region outside the foreground.
 192         mode = SkBlendMode::kSrcIn;
 193         SkImageFilter::CropRect cropRectFull(SkRect::MakeXYWH(0, 0, 80, 80));
 194         paint.setImageFilter(SkXfermodeImageFilter::Make(mode, background,
 195                                                          cropped, &cropRectFull));
 196         DrawClippedPaint(canvas, clipRect, paint, x, y);
 197         x += fBitmap.width() + MARGIN;
 198         if (x + fBitmap.width() > WIDTH) {
 199             x = 0;
 200             y += fBitmap.height() + MARGIN;
 201         }
 202     }
 203
 204 private:
 205     static void DrawClippedBitmap(SkCanvas* canvas, const SkBitmap& bitmap, const SkPaint& paint,
 206                            int x, int y) {
 207         canvas->save();
 208         canvas->translate(SkIntToScalar(x), SkIntToScalar(y));
 209         canvas->clipRect(SkRect::MakeWH(
 210             SkIntToScalar(bitmap.width()), SkIntToScalar(bitmap.height())));
 211         canvas->drawBitmap(bitmap, 0, 0, &paint);
 212         canvas->restore();
 213     }
 214
 215     static void DrawClippedPaint(SkCanvas* canvas, const SkRect& rect, const SkPaint& paint,
 216                           int x, int y) {
 217         canvas->save();
 218         canvas->translate(SkIntToScalar(x), SkIntToScalar(y));
 219         canvas->clipRect(rect);
 220         canvas->drawPaint(paint);
 221         canvas->restore();
 222     }
 223
 224     SkBitmap        fBitmap;
 225     sk_sp<SkImage>  fCheckerboard;
 226
 227     typedef GM INHERITED;
 228 };
 229
 230 //////////////////////////////////////////////////////////////////////////////
 231
 232 DEF_GM( return new XfermodeImageFilterGM; );
 233
 234 }