Initial import attempt, just to play with. Many things disabled/removed

ui/cc/ImageLayerChromium.cpp

Index: ui/cc/ImageLayerChromium.cpp
diff --git a/ui/cc/ImageLayerChromium.cpp b/ui/cc/ImageLayerChromium.cpp
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index 0000000000000000000000000000000000000000..f0aa113207cb3285f84c4302bafb49419b9b6b2a
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+++ b/ui/cc/ImageLayerChromium.cpp
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+/*
+ * Copyright (C) 2010 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"
+
+#if USE(ACCELERATED_COMPOSITING)
+
+#include "ImageLayerChromium.h"
+
+#include "LayerTextureSubImage.h"
+#include "LayerTextureUpdater.h"
+#include "ManagedTexture.h"
+#include "PlatformColor.h"
+#include "cc/CCLayerTreeHost.h"
+
+namespace WebCore {
+
+class ImageLayerTextureUpdater : public LayerTextureUpdater {
+public:
+    class Texture : public LayerTextureUpdater::Texture {
+    public:
+        Texture(ImageLayerTextureUpdater* textureUpdater, PassOwnPtr<ManagedTexture> texture)
+            : LayerTextureUpdater::Texture(texture)
+            , m_textureUpdater(textureUpdater)
+        {
+        }
+
+        virtual void updateRect(CCGraphicsContext* context, TextureAllocator* allocator, const IntRect& sourceRect, const IntRect& destRect) OVERRIDE
+        {
+            textureUpdater()->updateTextureRect(context, allocator, texture(), sourceRect, destRect);
+        }
+
+    private:
+        ImageLayerTextureUpdater* textureUpdater() { return m_textureUpdater; }
+
+        ImageLayerTextureUpdater* m_textureUpdater;
+    };
+
+    static PassRefPtr<ImageLayerTextureUpdater> create(bool useMapTexSubImage)
+    {
+        return adoptRef(new ImageLayerTextureUpdater(useMapTexSubImage));
+    }
+
+    virtual ~ImageLayerTextureUpdater() { }
+
+    virtual PassOwnPtr<LayerTextureUpdater::Texture> createTexture(TextureManager* manager)
+    {
+        return adoptPtr(new Texture(this, ManagedTexture::create(manager)));
+    }
+
+    virtual SampledTexelFormat sampledTexelFormat(GC3Denum textureFormat) OVERRIDE
+    {
+        return PlatformColor::sameComponentOrder(textureFormat) ?
+                LayerTextureUpdater::SampledTexelFormatRGBA : LayerTextureUpdater::SampledTexelFormatBGRA;
+    }
+
+    void updateTextureRect(CCGraphicsContext* context, TextureAllocator* allocator, ManagedTexture* texture, const IntRect& sourceRect, const IntRect& destRect)
+    {
+        texture->bindTexture(context, allocator);
+
+        // Source rect should never go outside the image pixels, even if this
+        // is requested because the texture extends outside the image.
+        IntRect clippedSourceRect = sourceRect;
+        IntRect imageRect = IntRect(0, 0, m_bitmap.width(), m_bitmap.height());
+        clippedSourceRect.intersect(imageRect);
+
+        IntRect clippedDestRect = destRect;
+        clippedDestRect.move(clippedSourceRect.location() - sourceRect.location());
+        clippedDestRect.setSize(clippedSourceRect.size());
+
+        SkAutoLockPixels lock(m_bitmap);
+        m_texSubImage.upload(static_cast<const uint8_t*>(m_bitmap.getPixels()), imageRect, clippedSourceRect, clippedDestRect, texture->format(), context);
+    }
+
+    void setBitmap(const SkBitmap& bitmap)
+    {
+        m_bitmap = bitmap;
+    }
+
+private:
+    explicit ImageLayerTextureUpdater(bool useMapTexSubImage)
+        : m_texSubImage(useMapTexSubImage)
+    {
+    }
+
+    SkBitmap m_bitmap;
+    LayerTextureSubImage m_texSubImage;
+};
+
+PassRefPtr<ImageLayerChromium> ImageLayerChromium::create()
+{
+    return adoptRef(new ImageLayerChromium());
+}
+
+ImageLayerChromium::ImageLayerChromium()
+    : TiledLayerChromium()
+{
+}
+
+ImageLayerChromium::~ImageLayerChromium()
+{
+}
+
+void ImageLayerChromium::setBitmap(const SkBitmap& bitmap)
+{
+    // setBitmap() currently gets called whenever there is any
+    // style change that affects the layer even if that change doesn't
+    // affect the actual contents of the image (e.g. a CSS animation).
+    // With this check in place we avoid unecessary texture uploads.
+    if (bitmap.pixelRef() && bitmap.pixelRef() == m_bitmap.pixelRef())
+        return;
+
+    m_bitmap = bitmap;
+    setNeedsDisplay();
+}
+
+void ImageLayerChromium::update(CCTextureUpdater& updater, const CCOcclusionTracker* occlusion)
+{
+    createTextureUpdaterIfNeeded();
+    if (m_needsDisplay) {
+        m_textureUpdater->setBitmap(m_bitmap);
+        updateTileSizeAndTilingOption();
+        invalidateRect(IntRect(IntPoint(), contentBounds()));
+        m_needsDisplay = false;
+    }
+
+    updateLayerRect(updater, visibleLayerRect(), occlusion);
+}
+
+void ImageLayerChromium::createTextureUpdaterIfNeeded()
+{
+    if (m_textureUpdater)
+        return;
+
+    m_textureUpdater = ImageLayerTextureUpdater::create(layerTreeHost()->layerRendererCapabilities().usingMapSub);
+    GC3Denum textureFormat = layerTreeHost()->layerRendererCapabilities().bestTextureFormat;
+    setTextureFormat(textureFormat);
+    setSampledTexelFormat(textureUpdater()->sampledTexelFormat(textureFormat));
+}
+
+LayerTextureUpdater* ImageLayerChromium::textureUpdater() const
+{
+    return m_textureUpdater.get();
+}
+
+IntSize ImageLayerChromium::contentBounds() const
+{
+    return IntSize(m_bitmap.width(), m_bitmap.height());
+}
+
+bool ImageLayerChromium::drawsContent() const
+{
+    return !m_bitmap.isNull() && TiledLayerChromium::drawsContent();
+}
+
+bool ImageLayerChromium::needsContentsScale() const
+{
+    // Contents scale is not need for image layer because this can be done in compositor more efficiently.
+    return false;
+}
+
+}
+#endif // USE(ACCELERATED_COMPOSITING)