1.1 --- /dev/null Thu Jan 01 00:00:00 1970 +0000
1.2 +++ b/widget/gonk/Framebuffer.h Wed Dec 31 06:09:35 2014 +0100
1.3 @@ -0,0 +1,62 @@
1.4 +/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
1.5 +/* vim: set sw=2 ts=8 et ft=cpp : */
1.6 +/* Copyright 2012 Mozilla Foundation and Mozilla contributors
1.7 + *
1.8 + * Licensed under the Apache License, Version 2.0 (the "License");
1.9 + * you may not use this file except in compliance with the License.
1.10 + * You may obtain a copy of the License at
1.11 + *
1.12 + * http://www.apache.org/licenses/LICENSE-2.0
1.13 + *
1.14 + * Unless required by applicable law or agreed to in writing, software
1.15 + * distributed under the License is distributed on an "AS IS" BASIS,
1.16 + * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
1.17 + * See the License for the specific language governing permissions and
1.18 + * limitations under the License.
1.19 + */
1.20 +
1.21 +class gfxASurface;
1.22 +class nsIntRegion;
1.23 +class nsIntSize;
1.24 +
1.25 +namespace mozilla {
1.26 +
1.27 +namespace Framebuffer {
1.28 +
1.29 +//
1.30 +// The general usage of Framebuffer is
1.31 +//
1.32 +// -- in initialization code --
1.33 +// Open();
1.34 +//
1.35 +// -- ready to paint next frame --
1.36 +// nsRefPtr<gfxASurface> backBuffer = BackBuffer();
1.37 +// // ...
1.38 +// Paint(backBuffer);
1.39 +// // ...
1.40 +// Present();
1.41 +//
1.42 +
1.43 +// Return true if the fbdev was successfully opened. If this fails,
1.44 +// the result of all further calls is undefined. Open() is idempotent.
1.45 +bool Open();
1.46 +
1.47 +// After Close(), the result of all further calls is undefined.
1.48 +// Close() is idempotent, and Open() can be called again after
1.49 +// Close().
1.50 +void Close();
1.51 +
1.52 +// Return true if the fbdev was successfully opened or the size was
1.53 +// already cached.
1.54 +bool GetSize(nsIntSize *aScreenSize);
1.55 +
1.56 +// Return the buffer to be drawn into, that will be the next frame.
1.57 +gfxASurface* BackBuffer();
1.58 +
1.59 +// Swap the front buffer for the back buffer. |aUpdated| is the
1.60 +// region of the back buffer that was repainted.
1.61 +void Present(const nsIntRegion& aUpdated);
1.62 +
1.63 +} // namespace Framebuffer
1.64 +
1.65 +} // namespace mozilla
