1 files changed, 161 insertions, 0 deletions
diff --git a/cc/ImageLayerChromium.cpp b/cc/ImageLayerChromium.cpp
new file mode 100644
index 0000000..09c97d8
--- /dev/null
+++ b/cc/ImageLayerChromium.cpp
@@ -0,0 +1,161 @@
+// Copyright 2010 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#include "config.h"
+
+#if USE(ACCELERATED_COMPOSITING)
+
+#include "ImageLayerChromium.h"
+
+#include "CCLayerTreeHost.h"
+#include "LayerTextureUpdater.h"
+#include "PlatformColor.h"
+
+namespace WebCore {
+
+class ImageLayerTextureUpdater : public LayerTextureUpdater {
+public:
+    class Texture : public LayerTextureUpdater::Texture {
+    public:
+        Texture(ImageLayerTextureUpdater* textureUpdater, PassOwnPtr<CCPrioritizedTexture> texture)
+            : LayerTextureUpdater::Texture(texture)
+            , m_textureUpdater(textureUpdater)
+        {
+        }
+
+        virtual void updateRect(CCResourceProvider* resourceProvider, const IntRect& sourceRect, const IntSize& destOffset) OVERRIDE
+        {
+            textureUpdater()->updateTextureRect(resourceProvider, texture(), sourceRect, destOffset);
+        }
+
+    private:
+        ImageLayerTextureUpdater* textureUpdater() { return m_textureUpdater; }
+
+        ImageLayerTextureUpdater* m_textureUpdater;
+    };
+
+    static PassRefPtr<ImageLayerTextureUpdater> create()
+    {
+        return adoptRef(new ImageLayerTextureUpdater());
+    }
+
+    virtual ~ImageLayerTextureUpdater() { }
+
+    virtual PassOwnPtr<LayerTextureUpdater::Texture> createTexture(CCPrioritizedTextureManager* manager)
+    {
+        return adoptPtr(new Texture(this, CCPrioritizedTexture::create(manager)));
+    }
+
+    virtual SampledTexelFormat sampledTexelFormat(GC3Denum textureFormat) OVERRIDE
+    {
+        return PlatformColor::sameComponentOrder(textureFormat) ?
+                LayerTextureUpdater::SampledTexelFormatRGBA : LayerTextureUpdater::SampledTexelFormatBGRA;
+    }
+
+    void updateTextureRect(CCResourceProvider* resourceProvider, CCPrioritizedTexture* texture, const IntRect& sourceRect, const IntSize& destOffset)
+    {
+        // 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);
+
+        IntSize clippedDestOffset = destOffset + IntSize(clippedSourceRect.location() - sourceRect.location());
+
+        SkAutoLockPixels lock(m_bitmap);
+        texture->upload(resourceProvider, static_cast<const uint8_t*>(m_bitmap.getPixels()), imageRect, clippedSourceRect, clippedDestOffset);
+    }
+
+    void setBitmap(const SkBitmap& bitmap)
+    {
+        m_bitmap = bitmap;
+    }
+
+private:
+    ImageLayerTextureUpdater() { }
+
+    SkBitmap m_bitmap;
+};
+
+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::setTexturePriorities(const CCPriorityCalculator& priorityCalc)
+{
+    // Update the tile data before creating all the layer's tiles.
+    updateTileSizeAndTilingOption();
+
+    TiledLayerChromium::setTexturePriorities(priorityCalc);
+}
+
+void ImageLayerChromium::update(CCTextureUpdateQueue& queue, const CCOcclusionTracker* occlusion, CCRenderingStats& stats)
+{
+    createTextureUpdaterIfNeeded();
+    if (m_needsDisplay) {
+        m_textureUpdater->setBitmap(m_bitmap);
+        updateTileSizeAndTilingOption();
+        invalidateContentRect(IntRect(IntPoint(), contentBounds()));
+        m_needsDisplay = false;
+    }
+    TiledLayerChromium::update(queue, occlusion, stats);
+}
+
+void ImageLayerChromium::createTextureUpdaterIfNeeded()
+{
+    if (m_textureUpdater)
+        return;
+
+    m_textureUpdater = ImageLayerTextureUpdater::create();
+    GC3Denum textureFormat = layerTreeHost()->rendererCapabilities().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)