src/third_party/skia/tests/CanvasStateTest.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 "CanvasStateHelpers.h"
   9 #include "SkCanvas.h"
  10 #include "SkCanvasStateUtils.h"
  11 #include "SkCommandLineFlags.h"
  12 #include "SkDrawFilter.h"
  13 #include "SkError.h"
  14 #include "SkPaint.h"
  15 #include "SkRRect.h"
  16 #include "SkRect.h"
  17 #include "Test.h"
  18
  19 // dlopen and the library flag are only used for tests which require this flag.
  20 #ifdef SK_SUPPORT_LEGACY_CLIPTOLAYERFLAG
  21 #include <dlfcn.h>
  22
  23 DEFINE_string(library, "", "Support library to use for CanvasState test. If empty (the default), "
  24                            "the test will be run without crossing a library boundary. Otherwise, "
  25                            "it is expected to be a full path to a shared library file, which will"
  26                            " be dynamically loaded. Functions from the library will be called to "
  27                            "test SkCanvasState. Instructions for generating the library are in "
  28                            "gyp/canvas_state_lib.gyp");
  29
  30
  31 // This class calls dlopen on the library passed in to the command line flag library, and handles
  32 // calling dlclose when it goes out of scope.
  33 class OpenLibResult {
  34 public:
  35     // If the flag library was passed to this run of the test, attempt to open it using dlopen and
  36     // report whether it succeeded.
  37     OpenLibResult(skiatest::Reporter* reporter) {
  38         if (FLAGS_library.count() == 1) {
  39             fHandle = dlopen(FLAGS_library[0], RTLD_LAZY | RTLD_LOCAL);
  40             REPORTER_ASSERT_MESSAGE(reporter, fHandle != NULL, "Failed to open library!");
  41         } else {
  42             fHandle = NULL;
  43         }
  44     }
  45
  46     // Automatically call dlclose when going out of scope.
  47     ~OpenLibResult() {
  48         if (fHandle) {
  49             dlclose(fHandle);
  50         }
  51     }
  52
  53     // Pointer to the shared library object.
  54     void* handle() { return fHandle; }
  55
  56 private:
  57     void* fHandle;
  58 };
  59
  60 DEF_TEST(CanvasState_test_complex_layers, reporter) {
  61     const int WIDTH = 400;
  62     const int HEIGHT = 400;
  63     const int SPACER = 10;
  64
  65     SkRect rect = SkRect::MakeXYWH(SkIntToScalar(SPACER), SkIntToScalar(SPACER),
  66                                    SkIntToScalar(WIDTH-(2*SPACER)),
  67                                    SkIntToScalar((HEIGHT-(2*SPACER)) / 7));
  68
  69     const SkColorType colorTypes[] = {
  70         kRGB_565_SkColorType, kN32_SkColorType
  71     };
  72
  73     const int layerAlpha[] = { 255, 255, 0 };
  74     const SkCanvas::SaveFlags flags[] = { SkCanvas::kARGB_NoClipLayer_SaveFlag,
  75                                           SkCanvas::kARGB_ClipLayer_SaveFlag,
  76                                           SkCanvas::kARGB_NoClipLayer_SaveFlag
  77     };
  78     REPORTER_ASSERT(reporter, sizeof(layerAlpha) == sizeof(flags));
  79
  80     bool (*drawFn)(SkCanvasState* state, float l, float t,
  81                    float r, float b, int32_t s);
  82
  83     OpenLibResult openLibResult(reporter);
  84     if (openLibResult.handle() != NULL) {
  85         *(void**) (&drawFn) = dlsym(openLibResult.handle(),
  86                                     "complex_layers_draw_from_canvas_state");
  87     } else {
  88         drawFn = complex_layers_draw_from_canvas_state;
  89     }
  90
  91     REPORTER_ASSERT(reporter, drawFn);
  92     if (!drawFn) {
  93         return;
  94     }
  95
  96     for (size_t i = 0; i < SK_ARRAY_COUNT(colorTypes); ++i) {
  97         SkBitmap bitmaps[2];
  98         for (int j = 0; j < 2; ++j) {
  99             bitmaps[j].allocPixels(SkImageInfo::Make(WIDTH, HEIGHT,
 100                                                      colorTypes[i],
 101                                                      kPremul_SkAlphaType));
 102
 103             SkCanvas canvas(bitmaps[j]);
 104
 105             canvas.drawColor(SK_ColorRED);
 106
 107             for (size_t k = 0; k < SK_ARRAY_COUNT(layerAlpha); ++k) {
 108                 // draw a rect within the layer's bounds and again outside the layer's bounds
 109                 canvas.saveLayerAlpha(&rect, layerAlpha[k], flags[k]);
 110
 111                 if (j) {
 112                     // Capture from the first Skia.
 113                     SkCanvasState* state = SkCanvasStateUtils::CaptureCanvasState(&canvas);
 114                     REPORTER_ASSERT(reporter, state);
 115
 116                     // And draw to it in the second Skia.
 117                     bool success = complex_layers_draw_from_canvas_state(state,
 118                             rect.fLeft, rect.fTop, rect.fRight, rect.fBottom, SPACER);
 119                     REPORTER_ASSERT(reporter, success);
 120
 121                     // And release it in the *first* Skia.
 122                     SkCanvasStateUtils::ReleaseCanvasState(state);
 123                 } else {
 124                     // Draw in the first Skia.
 125                     complex_layers_draw(&canvas, rect.fLeft, rect.fTop,
 126                                         rect.fRight, rect.fBottom, SPACER);
 127                 }
 128
 129                 canvas.restore();
 130
 131                 // translate the canvas for the next iteration
 132                 canvas.translate(0, 2*(rect.height() + SPACER));
 133             }
 134         }
 135
 136         // now we memcmp the two bitmaps
 137         REPORTER_ASSERT(reporter, bitmaps[0].getSize() == bitmaps[1].getSize());
 138         REPORTER_ASSERT(reporter, !memcmp(bitmaps[0].getPixels(),
 139                                           bitmaps[1].getPixels(),
 140                                           bitmaps[0].getSize()));
 141     }
 142 }
 143 #endif
 144
 145 ////////////////////////////////////////////////////////////////////////////////
 146
 147 #ifdef SK_SUPPORT_LEGACY_CLIPTOLAYERFLAG
 148 DEF_TEST(CanvasState_test_complex_clips, reporter) {
 149     const int WIDTH = 400;
 150     const int HEIGHT = 400;
 151     const int SPACER = 10;
 152
 153     SkIRect layerRect = SkIRect::MakeWH(WIDTH, HEIGHT / 4);
 154     layerRect.inset(2*SPACER, 2*SPACER);
 155
 156     SkIRect clipRect = layerRect;
 157     clipRect.fRight = clipRect.fLeft + (clipRect.width() / 2) - (2*SPACER);
 158     clipRect.outset(SPACER, SPACER);
 159
 160     SkIRect regionBounds = clipRect;
 161     regionBounds.offset(clipRect.width() + (2*SPACER), 0);
 162
 163     SkIRect regionInterior = regionBounds;
 164     regionInterior.inset(SPACER*3, SPACER*3);
 165
 166     SkRegion clipRegion;
 167     clipRegion.setRect(regionBounds);
 168     clipRegion.op(regionInterior, SkRegion::kDifference_Op);
 169
 170
 171     const SkRegion::Op clipOps[] = { SkRegion::kIntersect_Op,
 172                                      SkRegion::kIntersect_Op,
 173                                      SkRegion::kReplace_Op,
 174     };
 175     const SkCanvas::SaveFlags flags[] = { SkCanvas::kARGB_NoClipLayer_SaveFlag,
 176                                           SkCanvas::kARGB_ClipLayer_SaveFlag,
 177                                           SkCanvas::kARGB_NoClipLayer_SaveFlag,
 178     };
 179     REPORTER_ASSERT(reporter, sizeof(clipOps) == sizeof(flags));
 180
 181     bool (*drawFn)(SkCanvasState* state, int32_t l, int32_t t,
 182                    int32_t r, int32_t b, int32_t clipOp,
 183                    int32_t regionRects, int32_t* rectCoords);
 184
 185     OpenLibResult openLibResult(reporter);
 186     if (openLibResult.handle() != NULL) {
 187         *(void**) (&drawFn) = dlsym(openLibResult.handle(),
 188                                     "complex_clips_draw_from_canvas_state");
 189     } else {
 190         drawFn = complex_clips_draw_from_canvas_state;
 191     }
 192
 193     REPORTER_ASSERT(reporter, drawFn);
 194     if (!drawFn) {
 195         return;
 196     }
 197
 198     SkBitmap bitmaps[2];
 199     for (int i = 0; i < 2; ++i) {
 200         bitmaps[i].allocN32Pixels(WIDTH, HEIGHT);
 201
 202         SkCanvas canvas(bitmaps[i]);
 203
 204         canvas.drawColor(SK_ColorRED);
 205
 206         SkRegion localRegion = clipRegion;
 207
 208         for (size_t j = 0; j < SK_ARRAY_COUNT(flags); ++j) {
 209             SkRect layerBounds = SkRect::Make(layerRect);
 210             canvas.saveLayerAlpha(&layerBounds, 128, flags[j]);
 211
 212             if (i) {
 213                 SkCanvasState* state = SkCanvasStateUtils::CaptureCanvasState(&canvas);
 214                 REPORTER_ASSERT(reporter, state);
 215
 216                 SkRegion::Iterator iter(localRegion);
 217                 SkTDArray<int32_t> rectCoords;
 218                 for (; !iter.done(); iter.next()) {
 219                     const SkIRect& rect = iter.rect();
 220                     *rectCoords.append() = rect.fLeft;
 221                     *rectCoords.append() = rect.fTop;
 222                     *rectCoords.append() = rect.fRight;
 223                     *rectCoords.append() = rect.fBottom;
 224                 }
 225                 bool success = drawFn(state, clipRect.fLeft, clipRect.fTop,
 226                                       clipRect.fRight, clipRect.fBottom, clipOps[j],
 227                                       rectCoords.count() / 4, rectCoords.begin());
 228                 REPORTER_ASSERT(reporter, success);
 229
 230                 SkCanvasStateUtils::ReleaseCanvasState(state);
 231             } else {
 232                 complex_clips_draw(&canvas, clipRect.fLeft, clipRect.fTop,
 233                                    clipRect.fRight, clipRect.fBottom, clipOps[j],
 234                                    localRegion);
 235             }
 236
 237             canvas.restore();
 238
 239             // translate the canvas and region for the next iteration
 240             canvas.translate(0, SkIntToScalar(2*(layerRect.height() + (SPACER))));
 241             localRegion.translate(0, 2*(layerRect.height() + SPACER));
 242         }
 243     }
 244
 245     // now we memcmp the two bitmaps
 246     REPORTER_ASSERT(reporter, bitmaps[0].getSize() == bitmaps[1].getSize());
 247     REPORTER_ASSERT(reporter, !memcmp(bitmaps[0].getPixels(),
 248                                       bitmaps[1].getPixels(),
 249                                       bitmaps[0].getSize()));
 250 }
 251 #endif
 252
 253 ////////////////////////////////////////////////////////////////////////////////
 254
 255 class TestDrawFilter : public SkDrawFilter {
 256 public:
 257     virtual bool filter(SkPaint*, Type) SK_OVERRIDE { return true; }
 258 };
 259
 260 DEF_TEST(CanvasState_test_draw_filters, reporter) {
 261     TestDrawFilter drawFilter;
 262     SkBitmap bitmap;
 263     bitmap.allocN32Pixels(10, 10);
 264     SkCanvas canvas(bitmap);
 265
 266     canvas.setDrawFilter(&drawFilter);
 267
 268     SkCanvasState* state = SkCanvasStateUtils::CaptureCanvasState(&canvas);
 269     REPORTER_ASSERT(reporter, state);
 270     SkCanvas* tmpCanvas = SkCanvasStateUtils::CreateFromCanvasState(state);
 271     REPORTER_ASSERT(reporter, tmpCanvas);
 272
 273     REPORTER_ASSERT(reporter, canvas.getDrawFilter());
 274     REPORTER_ASSERT(reporter, NULL == tmpCanvas->getDrawFilter());
 275
 276     tmpCanvas->unref();
 277     SkCanvasStateUtils::ReleaseCanvasState(state);
 278 }
 279
 280 ////////////////////////////////////////////////////////////////////////////////
 281
 282 // we need this function to prevent SkError from printing to stdout
 283 static void error_callback(SkError code, void* ctx) {}
 284
 285 DEF_TEST(CanvasState_test_soft_clips, reporter) {
 286     SkBitmap bitmap;
 287     bitmap.allocN32Pixels(10, 10);
 288     SkCanvas canvas(bitmap);
 289
 290     SkRRect roundRect;
 291     roundRect.setOval(SkRect::MakeWH(5, 5));
 292
 293     canvas.clipRRect(roundRect, SkRegion::kIntersect_Op, true);
 294
 295     SkSetErrorCallback(error_callback, NULL);
 296
 297     SkCanvasState* state = SkCanvasStateUtils::CaptureCanvasState(&canvas);
 298     REPORTER_ASSERT(reporter, !state);
 299
 300     REPORTER_ASSERT(reporter, kInvalidOperation_SkError == SkGetLastError());
 301     SkClearLastError();
 302 }
 303
 304 #ifdef SK_SUPPORT_LEGACY_CLIPTOLAYERFLAG
 305 DEF_TEST(CanvasState_test_saveLayer_clip, reporter) {
 306     const int WIDTH = 100;
 307     const int HEIGHT = 100;
 308     const int LAYER_WIDTH = 50;
 309     const int LAYER_HEIGHT = 50;
 310
 311     SkBitmap bitmap;
 312     bitmap.allocN32Pixels(WIDTH, HEIGHT);
 313     SkCanvas canvas(bitmap);
 314
 315     SkRect bounds = SkRect::MakeWH(SkIntToScalar(LAYER_WIDTH), SkIntToScalar(LAYER_HEIGHT));
 316     canvas.clipRect(SkRect::MakeWH(SkIntToScalar(WIDTH), SkIntToScalar(HEIGHT)));
 317
 318     // Check that saveLayer without the kClipToLayer_SaveFlag leaves the
 319     // clip stack unchanged.
 320     canvas.saveLayer(&bounds, NULL, SkCanvas::kARGB_NoClipLayer_SaveFlag);
 321     SkRect clipStackBounds;
 322     SkClipStack::BoundsType boundsType;
 323     canvas.getClipStack()->getBounds(&clipStackBounds, &boundsType);
 324     REPORTER_ASSERT(reporter, clipStackBounds.width() == WIDTH);
 325     REPORTER_ASSERT(reporter, clipStackBounds.height() == HEIGHT);
 326     canvas.restore();
 327
 328     // Check that saveLayer with the kClipToLayer_SaveFlag sets the clip
 329     // stack to the layer bounds.
 330     canvas.saveLayer(&bounds, NULL, SkCanvas::kARGB_ClipLayer_SaveFlag);
 331     canvas.getClipStack()->getBounds(&clipStackBounds, &boundsType);
 332     REPORTER_ASSERT(reporter, clipStackBounds.width() == LAYER_WIDTH);
 333     REPORTER_ASSERT(reporter, clipStackBounds.height() == LAYER_HEIGHT);
 334
 335     canvas.restore();
 336 }
 337 #endif