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

ui/cc/ContentLayerChromium.cpp

Index: ui/cc/ContentLayerChromium.cpp
diff --git a/ui/cc/ContentLayerChromium.cpp b/ui/cc/ContentLayerChromium.cpp
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index 0000000000000000000000000000000000000000..58b0abf613664e0a651c120324ffa50c320df510
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+++ b/ui/cc/ContentLayerChromium.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 "ContentLayerChromium.h"
+
+#include "BitmapCanvasLayerTextureUpdater.h"
+#include "BitmapSkPictureCanvasLayerTextureUpdater.h"
+#include "FrameBufferSkPictureCanvasLayerTextureUpdater.h"
+#include "LayerPainterChromium.h"
+#include "cc/CCLayerTreeHost.h"
+#include "cc/CCSettings.h"
+#include <public/Platform.h>
+#include <wtf/CurrentTime.h>
+
+namespace WebCore {
+
+class ContentLayerPainter : public LayerPainterChromium {
+    WTF_MAKE_NONCOPYABLE(ContentLayerPainter);
+public:
+    static PassOwnPtr<ContentLayerPainter> create(ContentLayerDelegate* delegate)
+    {
+        return adoptPtr(new ContentLayerPainter(delegate));
+    }
+
+    virtual void paint(SkCanvas* canvas, const IntRect& contentRect, IntRect& opaque)
+    {
+        double paintStart = currentTime();
+        m_delegate->paintContents(canvas, contentRect, opaque);
+        double paintEnd = currentTime();
+        double pixelsPerSec = (contentRect.width() * contentRect.height()) / (paintEnd - paintStart);
+        WebKit::Platform::current()->histogramCustomCounts("Renderer4.AccelContentPaintDurationMS", (paintEnd - paintStart) * 1000, 0, 120, 30);
+        WebKit::Platform::current()->histogramCustomCounts("Renderer4.AccelContentPaintMegapixPerSecond", pixelsPerSec / 1000000, 10, 210, 30);
+    }
+private:
+    explicit ContentLayerPainter(ContentLayerDelegate* delegate)
+        : m_delegate(delegate)
+    {
+    }
+
+    ContentLayerDelegate* m_delegate;
+};
+
+PassRefPtr<ContentLayerChromium> ContentLayerChromium::create(ContentLayerDelegate* delegate)
+{
+    return adoptRef(new ContentLayerChromium(delegate));
+}
+
+ContentLayerChromium::ContentLayerChromium(ContentLayerDelegate* delegate)
+    : TiledLayerChromium()
+    , m_delegate(delegate)
+{
+}
+
+ContentLayerChromium::~ContentLayerChromium()
+{
+}
+
+bool ContentLayerChromium::drawsContent() const
+{
+    return TiledLayerChromium::drawsContent() && m_delegate;
+}
+
+void ContentLayerChromium::update(CCTextureUpdater& updater, const CCOcclusionTracker* occlusion)
+{
+    updateTileSizeAndTilingOption();
+    createTextureUpdaterIfNeeded();
+
+    IntRect layerRect;
+
+    // Always call updateLayerRect() but with an empty layer rectangle when
+    // layer doesn't draw contents.
+    if (drawsContent())
+        layerRect = visibleLayerRect();
+
+    updateLayerRect(updater, layerRect, occlusion);
+    m_needsDisplay = false;
+}
+
+void ContentLayerChromium::idleUpdate(CCTextureUpdater& updater, const CCOcclusionTracker* occlusion)
+{
+    if (!drawsContent())
+        return;
+
+    const IntRect layerRect = visibleLayerRect();
+    idleUpdateLayerRect(updater, layerRect, occlusion);
+    if (needsIdlePaint(layerRect))
+        setNeedsCommit();
+}
+
+void ContentLayerChromium::createTextureUpdaterIfNeeded()
+{
+    if (m_textureUpdater)
+        return;
+    if (layerTreeHost()->settings().acceleratePainting)
+        m_textureUpdater = FrameBufferSkPictureCanvasLayerTextureUpdater::create(ContentLayerPainter::create(m_delegate));
+    else if (CCSettings::perTilePaintingEnabled())
+        m_textureUpdater = BitmapSkPictureCanvasLayerTextureUpdater::create(ContentLayerPainter::create(m_delegate), layerTreeHost()->layerRendererCapabilities().usingMapSub);
+    else
+        m_textureUpdater = BitmapCanvasLayerTextureUpdater::create(ContentLayerPainter::create(m_delegate), layerTreeHost()->layerRendererCapabilities().usingMapSub);
+    m_textureUpdater->setOpaque(opaque());
+
+    GC3Denum textureFormat = layerTreeHost()->layerRendererCapabilities().bestTextureFormat;
+    setTextureFormat(textureFormat);
+    setSampledTexelFormat(textureUpdater()->sampledTexelFormat(textureFormat));
+}
+
+void ContentLayerChromium::setOpaque(bool opaque)
+{
+    LayerChromium::setOpaque(opaque);
+    if (m_textureUpdater)
+        m_textureUpdater->setOpaque(opaque);
+}
+
+}
+#endif // USE(ACCELERATED_COMPOSITING)