Allow ImageBitmaps derived from HTMLImageElements to be evicted from RAM.

Source/core/page/ImageBitmapTest.cpp

Index: Source/core/page/ImageBitmapTest.cpp
diff --git a/Source/core/page/ImageBitmapTest.cpp b/Source/core/page/ImageBitmapTest.cpp
new file mode 100644
index 0000000000000000000000000000000000000000..16f8eb3b6137403976ceacc3cc81a27c04edf3e6
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+++ b/Source/core/page/ImageBitmapTest.cpp
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+/*
+ * Copyright (c) 2013, Google Inc. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are
+ * met:
+ *
+ *     * Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ *     * Redistributions in binary form must reproduce the above
+ * copyright notice, this list of conditions and the following disclaimer
+ * in the documentation and/or other materials provided with the
+ * distribution.
+ *     * Neither the name of Google Inc. nor the names of its
+ * contributors may be used to endorse or promote products derived from
+ * this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+ * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+ * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+ * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include "config.h"
+#include "core/page/ImageBitmap.h"
+
+#include "core/dom/Document.h"
+#include "core/html/HTMLImageElement.h"
+#include "core/loader/cache/CachedImage.h"
+#include "core/platform/graphics/BitmapImage.h"
+#include "core/platform/graphics/skia/NativeImageSkia.h"
+
+#include <gtest/gtest.h>
+
+namespace WebCore {
+
+class ImageBitmapTest : public ::testing::Test {
+};
+
+// Verifies that the cached image held by an ImageBitmap is the same as the
+// one held by the HTMLImageElement.
+TEST_F(ImageBitmapTest, CachedImageConsistency)
+{
+    SkBitmap bitmap;
+    bitmap.setConfig(SkBitmap::kARGB_8888_Config, 10, 10);
+    bitmap.allocPixels();
+    int width = bitmap.width();
+    int height = bitmap.height();
+    for (int y = 0; y < height; ++y)
+        for (int x = 0; x < width; ++x)
+            *bitmap.getAddr32(x, y) = 0xFFFFFFFF;
+
+    RefPtr<HTMLImageElement> imageElement = HTMLImageElement::create(Document::create().get());
+    imageElement->setCachedImage(new CachedImage(BitmapImage::create(NativeImageSkia::create(bitmap)).get()));
+
+    RefPtr<ImageBitmap> imageBitmapNoCrop = ImageBitmap::create(imageElement.get(), IntRect(0, 0, width, height));
+    RefPtr<ImageBitmap> imageBitmapInteriorCrop = ImageBitmap::create(imageElement.get(), IntRect(width / 2, height / 2, width / 2, height / 2));
+    RefPtr<ImageBitmap> imageBitmapExteriorCrop = ImageBitmap::create(imageElement.get(), IntRect(-width / 2, -height / 2, width, height));
+    RefPtr<ImageBitmap> imageBitmapOutsideImageRect = ImageBitmap::create(imageElement.get(), IntRect(-width, -height, width, height));
+
+    ASSERT_EQ(imageBitmapNoCrop->bitmapImage().get(), imageElement->cachedImage()->image());
+    ASSERT_EQ(imageBitmapInteriorCrop->bitmapImage().get(), imageElement->cachedImage()->image());
+    ASSERT_EQ(imageBitmapExteriorCrop->bitmapImage().get(), imageElement->cachedImage()->image());
+    ASSERT_EQ(imageBitmapOutsideImageRect->bitmapImage().get(), imageElement->cachedImage()->image());
+}
+
+} // namespace