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/*
* Copyright 1997 through 2004 by Marc Aurele La France (TSI @ UQV), tsi@xfree86.org
*
* Permission to use, copy, modify, distribute, and sell this software and its
* documentation for any purpose is hereby granted without fee, provided that
* the above copyright notice appear in all copies and that both that copyright
* notice and this permission notice appear in supporting documentation, and
* that the name of Marc Aurele La France not be used in advertising or
* publicity pertaining to distribution of the software without specific,
* written prior permission. Marc Aurele La France makes no representations
* about the suitability of this software for any purpose. It is provided
* "as-is" without express or implied warranty.
*
* MARC AURELE LA FRANCE DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE,
* INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO
* EVENT SHALL MARC AURELE LA FRANCE BE LIABLE FOR ANY SPECIAL, INDIRECT OR
* CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE,
* DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER
* TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
* PERFORMANCE OF THIS SOFTWARE.
*/
#ifndef __MIBANK_H__
#define __MIBANK_H__ 1
#include "scrnintstr.h"
/*
* Banking external interface.
*/
/*
* This is the banking function type. The return value is normally zero.
* Non-zero returns can be used to implement the likes of scanline interleave,
* etc.
*/
typedef int miBankProc(
ScreenPtr /*pScreen*/,
unsigned int /*iBank*/
);
typedef miBankProc *miBankProcPtr;
typedef struct _miBankInfo
{
/*
* Banking refers to the use of one or more apertures (in the server's
* address space) to access various parts of a potentially larger hardware
* frame buffer.
*
* Three different banking schemes are supported:
*
* Single banking is indicated when pBankA and pBankB are equal and all
* three miBankProcPtr's point to the same function. Here, both reads and
* writes through the aperture access the same hardware location.
*
* Shared banking is indicated when pBankA and pBankB are equal but the
* source and destination functions differ. Here reads through the
* aperture do not necessarily access the same hardware location as writes.
*
* Double banking is indicated when pBankA and pBankB differ. Here two
* independent apertures are used to provide read/write access to
* potentially different hardware locations.
*
* Any other combination will result in no banking.
*/
miBankProcPtr SetSourceBank; /* Set pBankA bank number */
miBankProcPtr SetDestinationBank; /* Set pBankB bank number */
miBankProcPtr SetSourceAndDestinationBanks; /* Set both bank numbers */
pointer pBankA; /* First aperture location */
pointer pBankB; /* First or second aperture location */
/*
* BankSize is in units of sizeof(char) and is the size of each bank.
*/
unsigned long BankSize;
/*
* nBankDepth is the colour depth associated with the maximum number of a
* pixel's bits that are simultaneously accessible through the frame buffer
* aperture.
*/
unsigned int nBankDepth;
} miBankInfoRec, *miBankInfoPtr;
Bool
miInitializeBanking(
ScreenPtr /*pScreen*/,
unsigned int /*xsize*/,
unsigned int /*ysize*/,
unsigned int /*width*/,
miBankInfoPtr /*pBankInfo*/
);
Bool
miModifyBanking(
ScreenPtr /*pScreen*/,
miBankInfoPtr /*pBankInfo*/
);
/*
* This function determines the minimum screen width, given a initial estimate
* and various screen attributes. DDX needs to determine this width before
* initializing the screen.
*/
int
miScanLineWidth(
unsigned int /*xsize*/,
unsigned int /*ysize*/,
unsigned int /*width*/,
unsigned long /*BankSize*/,
PixmapFormatRec * /*pBankFormat*/,
unsigned int /*nWidthUnit*/
);
#endif /* __MIBANK_H__ */
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