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/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
/*
* This file is part of the LibreOffice project.
*
* 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/.
*
* This file incorporates work covered by the following license notice:
*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed
* with this work for additional information regarding copyright
* ownership. The ASF licenses this file to you under the Apache
* License, Version 2.0 (the "License"); you may not use this file
* except in compliance with the License. You may obtain a copy of
* the License at http://www.apache.org/licenses/LICENSE-2.0 .
*/
#ifndef __com_sun_star_rendering_XBufferController_idl__
#define __com_sun_star_rendering_XBufferController_idl__
#include <com/sun/star/uno/XInterface.idl>
#include <com/sun/star/lang/IllegalArgumentException.idl>
module com { module sun { module star { module rendering {
/** Interface providing access to double/multi-buffer facilities of
screen devices.<p>
This interface provides methods to enable and control
double/multi-buffering facilities on screen devices.<p>
@since OOo 2.0
*/
interface XBufferController : ::com::sun::star::uno::XInterface
{
/** Create the given number of background buffers.<p>
There's one buffer implicitly available, which is the canvas
surface itself. Thus, calling <code>createBuffers(1)</code>
creates a double-buffered object.<p>
@param nBuffers
The number of background<buffers requested. Must be greater
than 0.
@return the number of actually generated buffers, which might
be between 0 (no double-buffering available) and nBuffers.
@throws com::sun::star::lang::IllegalArgumentException
if nBuffers is smaller than one.
*/
long createBuffers( [in] long nBuffers )
raises (com::sun::star::lang::IllegalArgumentException);
/** Destroy all buffers generated via this object.
*/
void destroyBuffers();
/** Switch the display to show the specified buffer.<p>
The method returns, when the switch is performed and the
selected buffer is shown on screen, or immediately when an
error occurs. If the switch was successful, subsequent render
operations will be directed to the new backbuffer.<p>
Use this method if you need your screen display to be in sync
with other things, e.g. sound playback.<p>
@param bUpdateAll
When `TRUE`, update the whole screen. When `FALSE`,
implementation is permitted to restrict update to areas the
canvas itself changed (e.g. because of render operations, or
changes on the sprites). The former is useful for updates
after window expose events, the latter for animation display.
@return whether the switch was performed successfully.
@throws com::sun::star::lang::IllegalArgumentException
if nBuffer is outside the permissible range.
*/
boolean showBuffer( [in] boolean bUpdateAll );
/** Schedule the display of the specified buffer.<p>
The method returns, when the switching of the buffer is
successfully scheduled, or immediately when an error
occurs. If the switch was successful, subsequent render
operations will be directed to the new backbuffer. Note that,
if the buffer switching is exceedingly slow, or the frequency
of switchBuffer() is exceedingly high, the buffer scheduled
for display here might become the current render target
<em>before</em> it is fully displayed on screen. In this case,
any rendering operation to this buffer will block, until it is
safe to perform the operation without visible cluttering.<p>
Use this method if you favor maximal render speed, but don't
necessarily require your screen display to be in sync with
other things, e.g. sound playback.<p>
@param bUpdateAll
When `TRUE`, update the whole screen. When `FALSE`,
implementation is permitted to restrict update to areas the
canvas itself changed (e.g. because of render operations, or
changes on the sprites). The former is useful for updates
after window expose events, the latter for animation display.
@return whether the switch was performed successfully.
*/
boolean switchBuffer( [in] boolean bUpdateAll );
};
}; }; }; };
#endif
/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
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