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63 lines
1.8 KiB
C++
63 lines
1.8 KiB
C++
/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* vim: set sw=2 ts=8 et ft=cpp : */
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/* Copyright 2012 Mozilla Foundation and Mozilla contributors
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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class gfxASurface;
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class nsIntRegion;
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class nsIntSize;
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namespace mozilla {
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namespace Framebuffer {
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//
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// The general usage of Framebuffer is
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//
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// -- in initialization code --
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// Open();
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//
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// -- ready to paint next frame --
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// nsRefPtr<gfxASurface> backBuffer = BackBuffer();
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// // ...
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// Paint(backBuffer);
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// // ...
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// Present();
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//
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// Return true if the fbdev was successfully opened. If this fails,
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// the result of all further calls is undefined. Open() is idempotent.
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bool Open();
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// After Close(), the result of all further calls is undefined.
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// Close() is idempotent, and Open() can be called again after
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// Close().
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void Close();
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// Return true if the fbdev was successfully opened or the size was
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// already cached.
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bool GetSize(nsIntSize *aScreenSize);
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// Return the buffer to be drawn into, that will be the next frame.
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gfxASurface* BackBuffer();
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// Swap the front buffer for the back buffer. |aUpdated| is the
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// region of the back buffer that was repainted.
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void Present(const nsIntRegion& aUpdated);
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} // namespace Framebuffer
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} // namespace mozilla
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