third_party/WebKit/Source/core/frame/ImageBitmapTest.cpp

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#include "core/frame/ImageBitmap.h"

#include "SkPixelRef.h"  // FIXME: qualify this skia header file.
#include "core/dom/Document.h"
#include "core/fetch/ImageResource.h"
#include "core/fetch/MemoryCache.h"
#include "core/html/HTMLCanvasElement.h"
#include "core/html/HTMLImageElement.h"
#include "core/html/HTMLVideoElement.h"
#include "platform/graphics/StaticBitmapImage.h"
#include "platform/graphics/skia/SkiaUtils.h"
#include "platform/heap/Handle.h"
#include "platform/network/ResourceRequest.h"
#include "testing/gtest/include/gtest/gtest.h"
#include "third_party/skia/include/core/SkCanvas.h"
#include "third_party/skia/include/core/SkImage.h"
#include "third_party/skia/include/core/SkSurface.h"

namespace blink {

class ImageBitmapTest : public ::testing::Test {
 protected:
  virtual void SetUp() {
    sk_sp<SkSurface> surface = SkSurface::MakeRasterN32Premul(10, 10);
    surface->getCanvas()->clear(0xFFFFFFFF);
    m_image = surface->makeImageSnapshot();

    sk_sp<SkSurface> surface2 = SkSurface::MakeRasterN32Premul(5, 5);
    surface2->getCanvas()->clear(0xAAAAAAAA);
    m_image2 = surface2->makeImageSnapshot();

    // Save the global memory cache to restore it upon teardown.
    m_globalMemoryCache = replaceMemoryCacheForTesting(MemoryCache::create());
  }
  virtual void TearDown() {
    // Garbage collection is required prior to switching out the
    // test's memory cache; image resources are released, evicting
    // them from the cache.
    ThreadState::current()->collectGarbage(BlinkGC::NoHeapPointersOnStack,
                                           BlinkGC::GCWithSweep,
                                           BlinkGC::ForcedGC);

    replaceMemoryCacheForTesting(m_globalMemoryCache.release());
  }

  sk_sp<SkImage> m_image, m_image2;
  Persistent<MemoryCache> m_globalMemoryCache;
};

TEST_F(ImageBitmapTest, ImageResourceConsistency) {
  const ImageBitmapOptions defaultOptions;
  HTMLImageElement* imageElement =
      HTMLImageElement::create(*Document::create());
  ImageResource* image =
      ImageResource::create(StaticBitmapImage::create(m_image).get());
  imageElement->setImageResource(image);

  Optional<IntRect> cropRect =
      IntRect(0, 0, m_image->width(), m_image->height());
  ImageBitmap* imageBitmapNoCrop = ImageBitmap::create(
      imageElement, cropRect, &(imageElement->document()), defaultOptions);
  cropRect = IntRect(m_image->width() / 2, m_image->height() / 2,
                     m_image->width() / 2, m_image->height() / 2);
  ImageBitmap* imageBitmapInteriorCrop = ImageBitmap::create(
      imageElement, cropRect, &(imageElement->document()), defaultOptions);
  cropRect = IntRect(-m_image->width() / 2, -m_image->height() / 2,
                     m_image->width(), m_image->height());
  ImageBitmap* imageBitmapExteriorCrop = ImageBitmap::create(
      imageElement, cropRect, &(imageElement->document()), defaultOptions);
  cropRect = IntRect(-m_image->width(), -m_image->height(), m_image->width(),
                     m_image->height());
  ImageBitmap* imageBitmapOutsideCrop = ImageBitmap::create(
      imageElement, cropRect, &(imageElement->document()), defaultOptions);

  ASSERT_EQ(imageBitmapNoCrop->bitmapImage()->imageForCurrentFrame(),
            imageElement->cachedImage()->getImage()->imageForCurrentFrame());
  ASSERT_NE(imageBitmapInteriorCrop->bitmapImage()->imageForCurrentFrame(),
            imageElement->cachedImage()->getImage()->imageForCurrentFrame());
  ASSERT_NE(imageBitmapExteriorCrop->bitmapImage()->imageForCurrentFrame(),
            imageElement->cachedImage()->getImage()->imageForCurrentFrame());

  StaticBitmapImage* emptyImage = imageBitmapOutsideCrop->bitmapImage();
  ASSERT_NE(emptyImage->imageForCurrentFrame(),
            imageElement->cachedImage()->getImage()->imageForCurrentFrame());
}

// Verifies that ImageBitmaps constructed from HTMLImageElements hold a
// reference to the original Image if the HTMLImageElement src is changed.
TEST_F(ImageBitmapTest, ImageBitmapSourceChanged) {
  HTMLImageElement* image = HTMLImageElement::create(*Document::create());
  ImageResource* originalImageResource =
      ImageResource::create(StaticBitmapImage::create(m_image).get());
  image->setImageResource(originalImageResource);

  const ImageBitmapOptions defaultOptions;
  Optional<IntRect> cropRect =
      IntRect(0, 0, m_image->width(), m_image->height());
  ImageBitmap* imageBitmap = ImageBitmap::create(
      image, cropRect, &(image->document()), defaultOptions);
  ASSERT_EQ(imageBitmap->bitmapImage()->imageForCurrentFrame(),
            originalImageResource->getImage()->imageForCurrentFrame());

  ImageResource* newImageResource =
      ImageResource::create(StaticBitmapImage::create(m_image2).get());
  image->setImageResource(newImageResource);

  // The ImageBitmap should contain the same data as the original cached image
  {
    ASSERT_EQ(imageBitmap->bitmapImage()->imageForCurrentFrame(),
              originalImageResource->getImage()->imageForCurrentFrame());
    SkImage* image1 = imageBitmap->bitmapImage()->imageForCurrentFrame().get();
    ASSERT_NE(image1, nullptr);
    SkImage* image2 =
        originalImageResource->getImage()->imageForCurrentFrame().get();
    ASSERT_NE(image2, nullptr);
    ASSERT_EQ(image1, image2);
  }

  {
    ASSERT_NE(imageBitmap->bitmapImage()->imageForCurrentFrame(),
              newImageResource->getImage()->imageForCurrentFrame());
    SkImage* image1 = imageBitmap->bitmapImage()->imageForCurrentFrame().get();
    ASSERT_NE(image1, nullptr);
    SkImage* image2 =
        newImageResource->getImage()->imageForCurrentFrame().get();
    ASSERT_NE(image2, nullptr);
    ASSERT_NE(image1, image2);
  }
}

}  // namespace blink