skia/ext/platform_canvas_unittest.cc

   1 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 // TODO(awalker): clean up the const/non-const reference handling in this test
   6
   7 #include "skia/ext/platform_canvas.h"
   8
   9 #include "base/logging.h"
  10 #include "base/memory/scoped_ptr.h"
  11 #include "build/build_config.h"
  12 #include "skia/ext/platform_device.h"
  13 #include "testing/gtest/include/gtest/gtest.h"
  14 #include "third_party/skia/include/core/SkBitmap.h"
  15 #include "third_party/skia/include/core/SkColor.h"
  16 #include "third_party/skia/include/core/SkColorPriv.h"
  17 #include "third_party/skia/include/core/SkPixelRef.h"
  18
  19 #if defined(OS_MACOSX)
  20 #import <ApplicationServices/ApplicationServices.h>
  21 #endif
  22
  23 #if !defined(OS_WIN)
  24 #include <unistd.h>
  25 #endif
  26
  27 namespace skia {
  28
  29 namespace {
  30
  31 bool IsOfColor(const SkBitmap& bitmap, int x, int y, uint32_t color) {
  32   // For masking out the alpha values.
  33   static uint32_t alpha_mask =
  34       static_cast<uint32_t>(SK_A32_MASK) << SK_A32_SHIFT;
  35   return (*bitmap.getAddr32(x, y) | alpha_mask) == (color | alpha_mask);
  36 }
  37
  38 // Return true if the canvas is filled to canvas_color, and contains a single
  39 // rectangle filled to rect_color. This function ignores the alpha channel,
  40 // since Windows will sometimes clear the alpha channel when drawing, and we
  41 // will fix that up later in cases it's necessary.
  42 bool VerifyRect(const PlatformCanvas& canvas,
  43                 uint32_t canvas_color, uint32_t rect_color,
  44                 int x, int y, int w, int h) {
  45   SkBaseDevice* device = skia::GetTopDevice(canvas);
  46   const SkBitmap& bitmap = device->accessBitmap(false);
  47   SkAutoLockPixels lock(bitmap);
  48
  49   for (int cur_y = 0; cur_y < bitmap.height(); cur_y++) {
  50     for (int cur_x = 0; cur_x < bitmap.width(); cur_x++) {
  51       if (cur_x >= x && cur_x < x + w &&
  52           cur_y >= y && cur_y < y + h) {
  53         // Inside the square should be rect_color
  54         if (!IsOfColor(bitmap, cur_x, cur_y, rect_color))
  55           return false;
  56       } else {
  57         // Outside the square should be canvas_color
  58         if (!IsOfColor(bitmap, cur_x, cur_y, canvas_color))
  59           return false;
  60       }
  61     }
  62   }
  63   return true;
  64 }
  65
  66 #if !defined(OS_MACOSX)
  67 // Return true if canvas has something that passes for a rounded-corner
  68 // rectangle. Basically, we're just checking to make sure that the pixels in the
  69 // middle are of rect_color and pixels in the corners are of canvas_color.
  70 bool VerifyRoundedRect(const PlatformCanvas& canvas,
  71                        uint32_t canvas_color,
  72                        uint32_t rect_color,
  73                        int x,
  74                        int y,
  75                        int w,
  76                        int h) {
  77   SkBaseDevice* device = skia::GetTopDevice(canvas);
  78   const SkBitmap& bitmap = device->accessBitmap(false);
  79   SkAutoLockPixels lock(bitmap);
  80
  81   // Check corner points first. They should be of canvas_color.
  82   if (!IsOfColor(bitmap, x, y, canvas_color)) return false;
  83   if (!IsOfColor(bitmap, x + w, y, canvas_color)) return false;
  84   if (!IsOfColor(bitmap, x, y + h, canvas_color)) return false;
  85   if (!IsOfColor(bitmap, x + w, y, canvas_color)) return false;
  86
  87   // Check middle points. They should be of rect_color.
  88   if (!IsOfColor(bitmap, (x + w / 2), y, rect_color)) return false;
  89   if (!IsOfColor(bitmap, x, (y + h / 2), rect_color)) return false;
  90   if (!IsOfColor(bitmap, x + w, (y + h / 2), rect_color)) return false;
  91   if (!IsOfColor(bitmap, (x + w / 2), y + h, rect_color)) return false;
  92
  93   return true;
  94 }
  95 #endif
  96
  97 // Checks whether there is a white canvas with a black square at the given
  98 // location in pixels (not in the canvas coordinate system).
  99 bool VerifyBlackRect(const PlatformCanvas& canvas, int x, int y, int w, int h) {
 100   return VerifyRect(canvas, SK_ColorWHITE, SK_ColorBLACK, x, y, w, h);
 101 }
 102
 103 // Check that every pixel in the canvas is a single color.
 104 bool VerifyCanvasColor(const PlatformCanvas& canvas, uint32_t canvas_color) {
 105   return VerifyRect(canvas, canvas_color, 0, 0, 0, 0, 0);
 106 }
 107
 108 #if defined(OS_WIN)
 109 void DrawNativeRect(PlatformCanvas& canvas, int x, int y, int w, int h) {
 110   skia::ScopedPlatformPaint scoped_platform_paint(&canvas);
 111   HDC dc = scoped_platform_paint.GetPlatformSurface();
 112
 113   RECT inner_rc;
 114   inner_rc.left = x;
 115   inner_rc.top = y;
 116   inner_rc.right = x + w;
 117   inner_rc.bottom = y + h;
 118   FillRect(dc, &inner_rc, reinterpret_cast<HBRUSH>(GetStockObject(BLACK_BRUSH)));
 119 }
 120 #elif defined(OS_MACOSX)
 121 void DrawNativeRect(PlatformCanvas& canvas, int x, int y, int w, int h) {
 122   skia::ScopedPlatformPaint scoped_platform_paint(&canvas);
 123   CGContextRef context = scoped_platform_paint.GetPlatformSurface();
 124
 125   CGRect inner_rc = CGRectMake(x, y, w, h);
 126   // RGBA opaque black
 127   CGColorRef black = CGColorCreateGenericRGB(0.0, 0.0, 0.0, 1.0);
 128   CGContextSetFillColorWithColor(context, black);
 129   CGColorRelease(black);
 130   CGContextFillRect(context, inner_rc);
 131 }
 132 #else
 133 void DrawNativeRect(PlatformCanvas& canvas, int x, int y, int w, int h) {
 134   NOTIMPLEMENTED();
 135 }
 136 #endif
 137
 138 // Clips the contents of the canvas to the given rectangle. This will be
 139 // intersected with any existing clip.
 140 void AddClip(PlatformCanvas& canvas, int x, int y, int w, int h) {
 141   SkRect rect;
 142   rect.set(SkIntToScalar(x), SkIntToScalar(y),
 143            SkIntToScalar(x + w), SkIntToScalar(y + h));
 144   canvas.clipRect(rect);
 145 }
 146
 147 class LayerSaver {
 148  public:
 149   LayerSaver(PlatformCanvas& canvas, int x, int y, int w, int h)
 150       : canvas_(canvas),
 151         x_(x),
 152         y_(y),
 153         w_(w),
 154         h_(h) {
 155     SkRect bounds;
 156     bounds.set(SkIntToScalar(x_), SkIntToScalar(y_),
 157                SkIntToScalar(right()), SkIntToScalar(bottom()));
 158     canvas_.saveLayer(&bounds, NULL);
 159     canvas.clear(SkColorSetARGB(0, 0, 0, 0));
 160   }
 161
 162   ~LayerSaver() {
 163     canvas_.restore();
 164   }
 165
 166   int x() const { return x_; }
 167   int y() const { return y_; }
 168   int w() const { return w_; }
 169   int h() const { return h_; }
 170
 171   // Returns the EXCLUSIVE far bounds of the layer.
 172   int right() const { return x_ + w_; }
 173   int bottom() const { return y_ + h_; }
 174
 175  private:
 176   PlatformCanvas& canvas_;
 177   int x_, y_, w_, h_;
 178 };
 179
 180 // Size used for making layers in many of the below tests.
 181 const int kLayerX = 2;
 182 const int kLayerY = 3;
 183 const int kLayerW = 9;
 184 const int kLayerH = 7;
 185
 186 // Size used by some tests to draw a rectangle inside the layer.
 187 const int kInnerX = 4;
 188 const int kInnerY = 5;
 189 const int kInnerW = 2;
 190 const int kInnerH = 3;
 191
 192 }
 193
 194 // This just checks that our checking code is working properly, it just uses
 195 // regular skia primitives.
 196 TEST(PlatformCanvas, SkLayer) {
 197   // Create the canvas initialized to opaque white.
 198   RefPtr<SkCanvas> canvas = AdoptRef(CreatePlatformCanvas(16, 16, true));
 199   canvas->drawColor(SK_ColorWHITE);
 200
 201   // Make a layer and fill it completely to make sure that the bounds are
 202   // correct.
 203   {
 204     LayerSaver layer(*canvas, kLayerX, kLayerY, kLayerW, kLayerH);
 205     canvas->drawColor(SK_ColorBLACK);
 206   }
 207   EXPECT_TRUE(VerifyBlackRect(*canvas, kLayerX, kLayerY, kLayerW, kLayerH));
 208 }
 209
 210 #if !defined(USE_AURA)  // http://crbug.com/154358
 211
 212 // Test native clipping.
 213 TEST(PlatformCanvas, ClipRegion) {
 214   // Initialize a white canvas
 215   RefPtr<SkCanvas> canvas = AdoptRef(CreatePlatformCanvas(16, 16, true));
 216   canvas->drawColor(SK_ColorWHITE);
 217   EXPECT_TRUE(VerifyCanvasColor(*canvas, SK_ColorWHITE));
 218
 219   // Test that initially the canvas has no clip region, by filling it
 220   // with a black rectangle.
 221   // Note: Don't use LayerSaver, since internally it sets a clip region.
 222   DrawNativeRect(*canvas, 0, 0, 16, 16);
 223   EXPECT_TRUE(VerifyCanvasColor(*canvas, SK_ColorBLACK));
 224
 225   // Test that intersecting disjoint clip rectangles sets an empty clip region
 226   canvas->drawColor(SK_ColorWHITE);
 227   EXPECT_TRUE(VerifyCanvasColor(*canvas, SK_ColorWHITE));
 228   {
 229     LayerSaver layer(*canvas, 0, 0, 16, 16);
 230     AddClip(*canvas, 2, 3, 4, 5);
 231     AddClip(*canvas, 4, 9, 10, 10);
 232     DrawNativeRect(*canvas, 0, 0, 16, 16);
 233   }
 234   EXPECT_TRUE(VerifyCanvasColor(*canvas, SK_ColorWHITE));
 235 }
 236
 237 #endif  // !defined(USE_AURA)
 238
 239 // Test the layers get filled properly by native rendering.
 240 TEST(PlatformCanvas, FillLayer) {
 241   // Create the canvas initialized to opaque white.
 242   RefPtr<SkCanvas> canvas = AdoptRef(CreatePlatformCanvas(16, 16, true));
 243
 244   // Make a layer and fill it completely to make sure that the bounds are
 245   // correct.
 246   canvas->drawColor(SK_ColorWHITE);
 247   {
 248     LayerSaver layer(*canvas, kLayerX, kLayerY, kLayerW, kLayerH);
 249     DrawNativeRect(*canvas, 0, 0, 100, 100);
 250 #if defined(OS_WIN)
 251     MakeOpaque(canvas.get(), 0, 0, 100, 100);
 252 #endif
 253   }
 254   EXPECT_TRUE(VerifyBlackRect(*canvas, kLayerX, kLayerY, kLayerW, kLayerH));
 255
 256   // Make a layer and fill it partially to make sure the translation is correct.
 257   canvas->drawColor(SK_ColorWHITE);
 258   {
 259     LayerSaver layer(*canvas, kLayerX, kLayerY, kLayerW, kLayerH);
 260     DrawNativeRect(*canvas, kInnerX, kInnerY, kInnerW, kInnerH);
 261 #if defined(OS_WIN)
 262     MakeOpaque(canvas.get(), kInnerX, kInnerY, kInnerW, kInnerH);
 263 #endif
 264   }
 265   EXPECT_TRUE(VerifyBlackRect(*canvas, kInnerX, kInnerY, kInnerW, kInnerH));
 266
 267   // Add a clip on the layer and fill to make sure clip is correct.
 268   canvas->drawColor(SK_ColorWHITE);
 269   {
 270     LayerSaver layer(*canvas, kLayerX, kLayerY, kLayerW, kLayerH);
 271     canvas->save();
 272     AddClip(*canvas, kInnerX, kInnerY, kInnerW, kInnerH);
 273     DrawNativeRect(*canvas, 0, 0, 100, 100);
 274 #if defined(OS_WIN)
 275     MakeOpaque(canvas.get(), kInnerX, kInnerY, kInnerW, kInnerH);
 276 #endif
 277     canvas->restore();
 278   }
 279   EXPECT_TRUE(VerifyBlackRect(*canvas, kInnerX, kInnerY, kInnerW, kInnerH));
 280
 281   // Add a clip and then make the layer to make sure the clip is correct.
 282   canvas->drawColor(SK_ColorWHITE);
 283   canvas->save();
 284   AddClip(*canvas, kInnerX, kInnerY, kInnerW, kInnerH);
 285   {
 286     LayerSaver layer(*canvas, kLayerX, kLayerY, kLayerW, kLayerH);
 287     DrawNativeRect(*canvas, 0, 0, 100, 100);
 288 #if defined(OS_WIN)
 289     MakeOpaque(canvas.get(), 0, 0, 100, 100);
 290 #endif
 291   }
 292   canvas->restore();
 293   EXPECT_TRUE(VerifyBlackRect(*canvas, kInnerX, kInnerY, kInnerW, kInnerH));
 294 }
 295
 296 #if !defined(USE_AURA)  // http://crbug.com/154358
 297
 298 // Test that translation + make layer works properly.
 299 TEST(PlatformCanvas, TranslateLayer) {
 300   // Create the canvas initialized to opaque white.
 301   RefPtr<SkCanvas> canvas = AdoptRef(CreatePlatformCanvas(16, 16, true));
 302
 303   // Make a layer and fill it completely to make sure that the bounds are
 304   // correct.
 305   canvas->drawColor(SK_ColorWHITE);
 306   canvas->save();
 307   canvas->translate(1, 1);
 308   {
 309     LayerSaver layer(*canvas, kLayerX, kLayerY, kLayerW, kLayerH);
 310     DrawNativeRect(*canvas, 0, 0, 100, 100);
 311 #if defined(OS_WIN)
 312     MakeOpaque(canvas.get(), 0, 0, 100, 100);
 313 #endif
 314   }
 315   canvas->restore();
 316   EXPECT_TRUE(VerifyBlackRect(*canvas, kLayerX + 1, kLayerY + 1,
 317                               kLayerW, kLayerH));
 318
 319   // Translate then make the layer.
 320   canvas->drawColor(SK_ColorWHITE);
 321   canvas->save();
 322   canvas->translate(1, 1);
 323   {
 324     LayerSaver layer(*canvas, kLayerX, kLayerY, kLayerW, kLayerH);
 325     DrawNativeRect(*canvas, kInnerX, kInnerY, kInnerW, kInnerH);
 326 #if defined(OS_WIN)
 327     MakeOpaque(canvas.get(), kInnerX, kInnerY, kInnerW, kInnerH);
 328 #endif
 329   }
 330   canvas->restore();
 331   EXPECT_TRUE(VerifyBlackRect(*canvas, kInnerX + 1, kInnerY + 1,
 332                               kInnerW, kInnerH));
 333
 334   // Make the layer then translate.
 335   canvas->drawColor(SK_ColorWHITE);
 336   canvas->save();
 337   {
 338     LayerSaver layer(*canvas, kLayerX, kLayerY, kLayerW, kLayerH);
 339     canvas->translate(1, 1);
 340     DrawNativeRect(*canvas, kInnerX, kInnerY, kInnerW, kInnerH);
 341 #if defined(OS_WIN)
 342     MakeOpaque(canvas.get(), kInnerX, kInnerY, kInnerW, kInnerH);
 343 #endif
 344   }
 345   canvas->restore();
 346   EXPECT_TRUE(VerifyBlackRect(*canvas, kInnerX + 1, kInnerY + 1,
 347                               kInnerW, kInnerH));
 348
 349   // Translate both before and after, and have a clip.
 350   canvas->drawColor(SK_ColorWHITE);
 351   canvas->save();
 352   canvas->translate(1, 1);
 353   {
 354     LayerSaver layer(*canvas, kLayerX, kLayerY, kLayerW, kLayerH);
 355     canvas->drawColor(SK_ColorWHITE);
 356     canvas->translate(1, 1);
 357     AddClip(*canvas, kInnerX + 1, kInnerY + 1, kInnerW - 1, kInnerH - 1);
 358     DrawNativeRect(*canvas, 0, 0, 100, 100);
 359 #if defined(OS_WIN)
 360     MakeOpaque(canvas.get(), kLayerX, kLayerY, kLayerW, kLayerH);
 361 #endif
 362   }
 363   canvas->restore();
 364   EXPECT_TRUE(VerifyBlackRect(*canvas, kInnerX + 3, kInnerY + 3,
 365                               kInnerW - 1, kInnerH - 1));
 366
 367 // TODO(dglazkov): Figure out why this fails on Mac (antialiased clipping?),
 368 // modify test and remove this guard.
 369 #if !defined(OS_MACOSX)
 370   // Translate both before and after, and have a path clip.
 371   canvas->drawColor(SK_ColorWHITE);
 372   canvas->save();
 373   canvas->translate(1, 1);
 374   {
 375     LayerSaver layer(*canvas, kLayerX, kLayerY, kLayerW, kLayerH);
 376     canvas->drawColor(SK_ColorWHITE);
 377     canvas->translate(1, 1);
 378
 379     SkPath path;
 380     SkRect rect;
 381     rect.iset(kInnerX - 1, kInnerY - 1,
 382               kInnerX + kInnerW, kInnerY + kInnerH);
 383     const SkScalar kRadius = 2.0;
 384     path.addRoundRect(rect, kRadius, kRadius);
 385     canvas->clipPath(path);
 386
 387     DrawNativeRect(*canvas, 0, 0, 100, 100);
 388 #if defined(OS_WIN)
 389     MakeOpaque(canvas.get(), kLayerX, kLayerY, kLayerW, kLayerH);
 390 #endif
 391   }
 392   canvas->restore();
 393   EXPECT_TRUE(VerifyRoundedRect(*canvas, SK_ColorWHITE, SK_ColorBLACK,
 394                                 kInnerX + 1, kInnerY + 1, kInnerW, kInnerH));
 395 #endif
 396 }
 397
 398 #endif  // #if !defined(USE_AURA)
 399
 400 TEST(PlatformBitmapTest, PlatformBitmap) {
 401   const int kWidth = 400;
 402   const int kHeight = 300;
 403   scoped_ptr<PlatformBitmap> platform_bitmap(new PlatformBitmap);
 404
 405   EXPECT_TRUE(0 == platform_bitmap->GetSurface());
 406   EXPECT_TRUE(platform_bitmap->GetBitmap().empty());
 407   EXPECT_TRUE(platform_bitmap->GetBitmap().isNull());
 408
 409   EXPECT_TRUE(platform_bitmap->Allocate(kWidth, kHeight, /*is_opaque=*/false));
 410
 411   EXPECT_TRUE(0 != platform_bitmap->GetSurface());
 412   EXPECT_FALSE(platform_bitmap->GetBitmap().empty());
 413   EXPECT_FALSE(platform_bitmap->GetBitmap().isNull());
 414   EXPECT_EQ(kWidth, platform_bitmap->GetBitmap().width());
 415   EXPECT_EQ(kHeight, platform_bitmap->GetBitmap().height());
 416   EXPECT_LE(static_cast<size_t>(platform_bitmap->GetBitmap().width()*4),
 417             platform_bitmap->GetBitmap().rowBytes());
 418   EXPECT_EQ(kN32_SkColorType,  // Same for all platforms.
 419             platform_bitmap->GetBitmap().colorType());
 420   EXPECT_TRUE(platform_bitmap->GetBitmap().lockPixelsAreWritable());
 421   EXPECT_TRUE(platform_bitmap->GetBitmap().pixelRef()->isLocked());
 422   EXPECT_TRUE(platform_bitmap->GetBitmap().pixelRef()->unique());
 423
 424   *(platform_bitmap->GetBitmap().getAddr32(10, 20)) = 0xDEED1020;
 425   *(platform_bitmap->GetBitmap().getAddr32(20, 30)) = 0xDEED2030;
 426
 427   SkBitmap sk_bitmap = platform_bitmap->GetBitmap();
 428   sk_bitmap.lockPixels();
 429
 430   EXPECT_FALSE(platform_bitmap->GetBitmap().pixelRef()->unique());
 431   EXPECT_FALSE(sk_bitmap.pixelRef()->unique());
 432
 433   EXPECT_EQ(0xDEED1020, *sk_bitmap.getAddr32(10, 20));
 434   EXPECT_EQ(0xDEED2030, *sk_bitmap.getAddr32(20, 30));
 435
 436   *(platform_bitmap->GetBitmap().getAddr32(30, 40)) = 0xDEED3040;
 437
 438   // The SkBitmaps derived from a PlatformBitmap must be capable of outliving
 439   // the PlatformBitmap.
 440   platform_bitmap.reset();
 441
 442   EXPECT_TRUE(sk_bitmap.pixelRef()->unique());
 443
 444   EXPECT_EQ(0xDEED1020, *sk_bitmap.getAddr32(10, 20));
 445   EXPECT_EQ(0xDEED2030, *sk_bitmap.getAddr32(20, 30));
 446   EXPECT_EQ(0xDEED3040, *sk_bitmap.getAddr32(30, 40));
 447   sk_bitmap.unlockPixels();
 448
 449   EXPECT_EQ(NULL, sk_bitmap.getPixels());
 450
 451   sk_bitmap.lockPixels();
 452   EXPECT_EQ(0xDEED1020, *sk_bitmap.getAddr32(10, 20));
 453   EXPECT_EQ(0xDEED2030, *sk_bitmap.getAddr32(20, 30));
 454   EXPECT_EQ(0xDEED3040, *sk_bitmap.getAddr32(30, 40));
 455   sk_bitmap.unlockPixels();
 456 }
 457
 458
 459 }  // namespace skia