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69 lines
2.1 KiB
C++
69 lines
2.1 KiB
C++
/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*-
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* vim: sw=2 ts=8 et :
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*/
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/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this file,
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* You can obtain one at http://mozilla.org/MPL/2.0/. */
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#ifndef mozilla_layers_Composer2D_h
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#define mozilla_layers_Composer2D_h
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#include "gfxTypes.h"
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#include "nsISupportsImpl.h"
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/**
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* Many platforms have dedicated hardware for simple composition.
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* This hardware is usually faster or more power efficient than the
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* GPU. However, in exchange for this better performance, generality
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* has to be sacrificed: no 3d transforms, no intermediate surfaces,
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* no special shader effects, loss of other goodies depending on the
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* platform.
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*
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* Composer2D is a very simple interface to this class of hardware
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* that allows an implementation to "try rendering" with the fast
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* path. If the given layer tree requires more generality than the
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* hardware provides, the implementation should bail and have the
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* layer manager fall back on full GPU composition.
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*/
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namespace mozilla {
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namespace gfx {
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struct Matrix;
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}
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namespace layers {
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class Layer;
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class Composer2D {
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NS_INLINE_DECL_REFCOUNTING(Composer2D)
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protected:
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// Protected destructor, to discourage deletion outside of Release():
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virtual ~Composer2D() {}
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public:
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/**
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* Return true if |aRoot| met the implementation's criteria for fast
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* composition and the render was successful. Return false to fall
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* back on the GPU.
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*
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* |aWorldTransform| must be applied to |aRoot|'s subtree when
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* rendering to the framebuffer. This is a global transform on the
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* entire scene, defined in GL space. If the Composer2D
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* implementation is unable to honor the transform, it should return
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* false.
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*
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* Currently, when TryRender() returns true, the entire framebuffer
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* must have been rendered.
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*/
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virtual bool TryRender(Layer* aRoot, const gfx::Matrix& aWorldTransform,
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bool aGeometryChanged) = 0;
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};
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} // namespace layers
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} // namespace mozilla
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#endif // mozilla_layers_Composer2D_h
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