gecko-dev/widget/gonk/Framebuffer.h

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/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* 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
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
class gfxASurface;
class nsIntRegion;
class nsIntSize;
namespace mozilla {
namespace Framebuffer {
//
// The general usage of Framebuffer is
//
// -- in initialization code --
// Open();
//
// -- ready to paint next frame --
// nsRefPtr<gfxASurface> backBuffer = BackBuffer();
// // ...
// Paint(backBuffer);
// // ...
// Present();
//
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// Return true if the fbdev was successfully opened. If this fails,
// the result of all further calls is undefined. Open() is idempotent.
bool Open();
// After Close(), the result of all further calls is undefined.
// Close() is idempotent, and Open() can be called again after
// Close().
void Close();
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// Return true if the fbdev was successfully opened or the size was
// already cached.
bool GetSize(nsIntSize *aScreenSize);
// Return the buffer to be drawn into, that will be the next frame.
gfxASurface* BackBuffer();
// Swap the front buffer for the back buffer. |aUpdated| is the
// region of the back buffer that was repainted.
void Present(const nsIntRegion& aUpdated);
} // namespace Framebuffer
} // namespace mozilla