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Gecko:Layers: Difference between revisions
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// Create a YUV layer with given size and format, and adopt the memory buffer | // Create a YUV layer with given size and format, and adopt the memory buffer | ||
YUVLayerBuilder(size, format, bufferToAdopt); | YUVLayerBuilder(size, format, bufferToAdopt); | ||
}; | |||
class WebGLBufferLayerBuilder : LayerBuilder { | |||
// Create a layer that's a logical copy (ideally copy on write) of a given | |||
// WebGL canvas with given size and format, and adopt the memory buffer | |||
WebGLLayerBuilder(webGLBuffer); | |||
}; | }; | ||
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ContainerLayerBuilder(size, format); | ContainerLayerBuilder(size, format); | ||
// The following methods can only be called after all LayerBuilder property | |||
// setters are done. | |||
// Add an existing layer | // Add an existing layer | ||
addLayer(Layer); | addLayer(Layer); | ||
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RenderedLayerBuilder(size, format); | RenderedLayerBuilder(size, format); | ||
// This can only be called after all LayerBuilder property setters are | |||
// done. The context cannot be used after finish() is called. | |||
gfxContext* getContext(); | gfxContext* getContext(); | ||
}; | }; | ||
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Add a way to return a Layer from a paint event (or just set it directly on the widget), so it gets rendered, possibly asynchronously on another thread. | Add a way to return a Layer from a paint event (or just set it directly on the widget), so it gets rendered, possibly asynchronously on another thread. | ||
Clients can use a mixture of retained Layers and recursive painting with each recursion level delimited by ContainerLayerBuilder::addContainerChild followed by finish() on the child. | |||
The goal is to allow a pure cairo implementation of this API that's as efficient as we have today. In that implementation RenderedLayerBuilder::getContext tries to return a context that renders directly into the underlying surface for some ancestor. Of course we also want to have a GL or D3D implementation that's fast, but will require more temporary surfaces if we're not using cairo-gl. | |||
When we go to off-main-thread compositing we'll want to add support for animation and other stuff. For example we might want a YUVSeriesLayerBuilder that can select from a queue of timestamped frames based on the current time. The rendering property setters on LayerBuilder would be extended with animating setters that take a list of timestamped values, or perhaps the parameters of actual transition functions. | |||
== Jeff == | == Jeff == | ||
== Bas == | == Bas == | ||