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26 #ifndef WebLayerTreeView_h
27 #define WebLayerTreeView_h
30 #include "WebCommon.h"
31 #include "WebFloatPoint.h"
32 #include "WebNonCopyable.h"
33 #include "WebPrivateOwnPtr.h"
39 class WebGraphicsContext3D;
43 struct WebRenderingStats;
45 class WebLayerTreeView {
47 virtual ~WebLayerTreeView() { }
49 // Initialization and lifecycle --------------------------------------
51 // Indicates that the compositing surface used by this WebLayerTreeView is ready to use.
52 // A WebLayerTreeView may request a context from its client before the surface is ready,
53 // but it won't attempt to use it.
54 virtual void setSurfaceReady() = 0;
56 // Sets the root of the tree. The root is set by way of the constructor.
57 virtual void setRootLayer(const WebLayer&) = 0;
58 virtual void clearRootLayer() = 0;
61 // View properties ---------------------------------------------------
63 virtual void setViewportSize(const WebSize& layoutViewportSize, const WebSize& deviceViewportSize) = 0;
64 // Gives the viewport size in layer space.
65 virtual WebSize layoutViewportSize() const = 0;
66 // Gives the viewport size in physical device pixels (may be different
67 // from the above if there exists page scale, device scale or fixed layout
69 virtual WebSize deviceViewportSize() const = 0;
71 virtual void setDeviceScaleFactor(float) = 0;
72 virtual float deviceScaleFactor() const = 0;
74 // Sets the background color for the viewport.
75 virtual void setBackgroundColor(WebColor) = 0;
77 // Sets the background transparency for the viewport. The default is 'false'.
78 virtual void setHasTransparentBackground(bool) = 0;
80 // Sets the overhang gutter bitmap.
81 virtual void setOverhangBitmap(const SkBitmap&) { }
83 // Sets whether this view is visible. In threaded mode, a view that is not visible will not
84 // composite or trigger updateAnimations() or layout() calls until it becomes visible.
85 virtual void setVisible(bool) = 0;
87 // Sets the current page scale factor and minimum / maximum limits. Both limits are initially 1 (no page scale allowed).
88 virtual void setPageScaleFactorAndLimits(float pageScaleFactor, float minimum, float maximum) = 0;
90 // Starts an animation of the page scale to a target scale factor and scroll offset.
91 // If useAnchor is true, destination is a point on the screen that will remain fixed for the duration of the animation.
92 // If useAnchor is false, destination is the final top-left scroll position.
93 virtual void startPageScaleAnimation(const WebPoint& destination, bool useAnchor, float newPageScale, double durationSec) = 0;
96 // Flow control and scheduling ---------------------------------------
98 // Indicates that an animation needs to be updated.
99 virtual void setNeedsAnimate() = 0;
101 // Indicates whether a commit is pending.
102 virtual bool commitRequested() const = 0;
104 // Relays the end of a fling animation.
105 virtual void didStopFlinging() { }
107 // Composites and attempts to read back the result into the provided
108 // buffer. If it wasn't possible, e.g. due to context lost, will return
109 // false. Pixel format is 32bit (RGBA), and the provided buffer must be
110 // large enough contain viewportSize().width() * viewportSize().height()
111 // pixels. The WebLayerTreeView does not assume ownership of the buffer.
112 // The buffer is not modified if the false is returned.
113 virtual bool compositeAndReadback(void *pixels, const WebRect&) = 0;
115 // Blocks until the most recently composited frame has finished rendering on the GPU.
116 // This can have a significant performance impact and should be used with care.
117 virtual void finishAllRendering() = 0;
119 // Prevents updates to layer tree from becoming visible.
120 virtual void setDeferCommits(bool deferCommits) { }
122 // Take responsiblity for this layer's animations, even if this layer hasn't yet
123 // been added to the tree.
124 virtual void registerForAnimations(WebLayer* layer) { }
126 // Identify key layers to the compositor when using the pinch virtual viewport.
127 virtual void registerViewportLayers(
128 const WebLayer* pageScaleLayerLayer,
129 const WebLayer* innerViewportScrollLayer,
130 const WebLayer* outerViewportScrollLayer) { }
131 virtual void clearViewportLayers() { }
133 // Debugging / dangerous ---------------------------------------------
135 // Toggles the FPS counter in the HUD layer
136 virtual void setShowFPSCounter(bool) { }
138 // Toggles the paint rects in the HUD layer
139 virtual void setShowPaintRects(bool) { }
141 // Toggles the debug borders on layers
142 virtual void setShowDebugBorders(bool) { }
144 // Toggles continuous painting
145 virtual void setContinuousPaintingEnabled(bool) { }
147 // Toggles scroll bottleneck rects on the HUD layer
148 virtual void setShowScrollBottleneckRects(bool) { }
153 #endif // WebLayerTreeView_h