4f3610dd6b
Currently we use a world transform on the LayerManager. This gets passed to the screen render target which adjusts the gl transform to accomplish the rotation. This causes a lot of the system to have to know about the transform. Instead we can just bake the transform into the root layer's shadow transform. Everything now mostly just works.
62 lines
1.8 KiB
C++
62 lines
1.8 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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class 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_THREADSAFE_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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* 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, 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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