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