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51 lines
1.4 KiB
C++
51 lines
1.4 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 ft=cpp : */
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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
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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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, along with the
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// dimensions of the screen. If this fails, the result of all further
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// calls is undefined. Open() is idempotent.
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bool Open(nsIntSize* aScreenSize);
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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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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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