Insert pinch zoom virtual viewport layers to graphics layer tree.

Source/WebKit/chromium/src/PinchViewports.h

 /*
  * 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
@@ skipping 10 matching lines @@
  * 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.
  */
 
-#ifndef ViewportAnchor_h
-#define ViewportAnchor_h
+#ifndef PinchViewports_h
+#define PinchViewports_h
 
 #include "core/platform/graphics/FloatSize.h"
-#include "core/platform/graphics/IntPoint.h"
-#include "core/platform/graphics/IntRect.h"
-#include "core/platform/graphics/LayoutRect.h"
-#include <wtf/RefCounted.h>
+#include "core/platform/graphics/GraphicsLayerClient.h"
+#include "public/platform/WebScrollbar.h"
+#include "public/platform/WebSize.h"
+#include "wtf/OwnPtr.h"
+#include "wtf/PassOwnPtr.h"
 
 namespace WebCore {
-class EventHandler;
-class IntSize;
-class Node;
+class GraphicsLayer;
 }
 
 namespace WebKit {
 
-// ViewportAnchor provides a way to anchor a viewport origin to a DOM node.
-// In particular, the user supplies the current viewport (in CSS coordinates)
-// and an anchor point (in view coordinates, e.g., (0, 0) == viewport origin,
-// (0.5, 0) == viewport top center). The anchor point tracks the underlying DOM
-// node; as the node moves or the view is resized, the viewport anchor maintains
-// its orientation relative to the node, and the viewport origin maintains its
-// orientation relative to the anchor.
-class ViewportAnchor {
-    WTF_MAKE_NONCOPYABLE(ViewportAnchor);
+using WebCore::GraphicsContext;

[jamesr, 2013/06/17 20:42:10]

since you're in a header and there's only one use of most these types, it'd be
cleaner to just fully qualify them

[wjmaclean, 2013/06/17 22:09:04]

Done.

+using WebCore::GraphicsLayer;
+using WebCore::GraphicsLayerPaintingPhase;
+using WebCore::IntRect;
+
+class WebLayerTreeView;
+class WebScrollbarLayer;
+class WebViewImpl;
+
+class PinchViewports : WebCore::GraphicsLayerClient {
 public:
-    explicit ViewportAnchor(WebCore::EventHandler* eventHandler);
+    static PassOwnPtr<PinchViewports> create(WebViewImpl* owner);
+    ~PinchViewports();
 
-    void setAnchor(const WebCore::IntRect& viewRect, const WebCore::FloatSize& anchorInViewCoords);
+    void setOverflowControlsHostLayer(GraphicsLayer*);
+    GraphicsLayer* rootGraphicsLayer()
+    {
+        return m_innerViewportClipLayer.get();
+    }
+    void setViewportSize(const WebCore::FloatSize&);
+    void showGraphicsLayers();
 
-    WebCore::IntPoint computeOrigin(const WebCore::IntSize& currentViewSize) const;
+    void registerViewportLayersWithTreeView(WebLayerTreeView*) const;
+    void clearViewportLayersForTreeView(WebLayerTreeView*) const;
+
+    // GraphicsLayerClient implementation.
+    virtual void notifyAnimationStarted(const GraphicsLayer*, double time) OVERRIDE;
+    virtual void paintContents(const GraphicsLayer*, GraphicsContext&, GraphicsLayerPaintingPhase, const IntRect& inClip) OVERRIDE;
 
 private:
-    WebCore::EventHandler* m_eventHandler;
+    explicit PinchViewports(WebViewImpl* owner);
 
-    WebCore::IntRect m_viewRect;
+    void setupScrollbar(WebKit::WebScrollbar::Orientation);
 
-    RefPtr<WebCore::Node> m_anchorNode;
-    WebCore::LayoutRect m_anchorNodeBounds;
-
-    WebCore::FloatSize m_anchorInViewCoords;
-    WebCore::FloatSize m_anchorInNodeCoords;
+    WebViewImpl* m_owner;
+    OwnPtr<GraphicsLayer> m_innerViewportClipLayer;
+    OwnPtr<GraphicsLayer> m_pageScaleLayer;
+    OwnPtr<GraphicsLayer> m_innerViewportScrollLayer;
+    OwnPtr<GraphicsLayer> m_overlayScrollbarHorizontal;
+    OwnPtr<GraphicsLayer> m_overlayScrollbarVertical;
 };
 
 } // namespace WebKit
 
- #endif
+#endif // PinchViewports_h