| 1 | /*
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| 2 | * Copyright 1997 through 2004 by Marc Aurele La France (TSI @ UQV), tsi@xfree86.org
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| 3 | *
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| 4 | * Permission to use, copy, modify, distribute, and sell this software and its
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| 5 | * documentation for any purpose is hereby granted without fee, provided that
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| 6 | * the above copyright notice appear in all copies and that both that copyright
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| 7 | * notice and this permission notice appear in supporting documentation, and
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| 8 | * that the name of Marc Aurele La France not be used in advertising or
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| 9 | * publicity pertaining to distribution of the software without specific,
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| 10 | * written prior permission. Marc Aurele La France makes no representations
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| 11 | * about the suitability of this software for any purpose. It is provided
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| 12 | * "as-is" without express or implied warranty.
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| 13 | *
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| 14 | * MARC AURELE LA FRANCE DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE,
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| 15 | * INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO
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| 16 | * EVENT SHALL MARC AURELE LA FRANCE BE LIABLE FOR ANY SPECIAL, INDIRECT OR
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| 17 | * CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE,
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| 18 | * DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER
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| 19 | * TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
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| 20 | * PERFORMANCE OF THIS SOFTWARE.
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| 21 | */
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| 22 |
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| 23 |
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| 24 | #ifndef __MIBANK_H__
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| 25 | #define __MIBANK_H__ 1
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| 26 |
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| 27 | #include "scrnintstr.h"
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| 28 |
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| 29 | /*
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| 30 | * Banking external interface.
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| 31 | */
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| 32 |
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| 33 | /*
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| 34 | * This is the banking function type. The return value is normally zero.
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| 35 | * Non-zero returns can be used to implement the likes of scanline interleave,
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| 36 | * etc.
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| 37 | */
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| 38 | typedef int miBankProc(
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| 39 | ScreenPtr /*pScreen*/,
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| 40 | unsigned int /*iBank*/
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| 41 | );
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| 42 |
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| 43 | typedef miBankProc *miBankProcPtr;
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| 44 |
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| 45 | typedef struct _miBankInfo
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| 46 | {
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| 47 | /*
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| 48 | * Banking refers to the use of one or more apertures (in the server's
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| 49 | * address space) to access various parts of a potentially larger hardware
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| 50 | * frame buffer.
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| 51 | *
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| 52 | * Three different banking schemes are supported:
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| 53 | *
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| 54 | * Single banking is indicated when pBankA and pBankB are equal and all
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| 55 | * three miBankProcPtr's point to the same function. Here, both reads and
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| 56 | * writes through the aperture access the same hardware location.
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| 57 | *
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| 58 | * Shared banking is indicated when pBankA and pBankB are equal but the
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| 59 | * source and destination functions differ. Here reads through the
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| 60 | * aperture do not necessarily access the same hardware location as writes.
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| 61 | *
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| 62 | * Double banking is indicated when pBankA and pBankB differ. Here two
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| 63 | * independent apertures are used to provide read/write access to
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| 64 | * potentially different hardware locations.
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| 65 | *
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| 66 | * Any other combination will result in no banking.
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| 67 | */
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| 68 | miBankProcPtr SetSourceBank; /* Set pBankA bank number */
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| 69 | miBankProcPtr SetDestinationBank; /* Set pBankB bank number */
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| 70 | miBankProcPtr SetSourceAndDestinationBanks; /* Set both bank numbers */
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| 71 |
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| 72 | pointer pBankA; /* First aperture location */
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| 73 | pointer pBankB; /* First or second aperture location */
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| 74 |
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| 75 | /*
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| 76 | * BankSize is in units of sizeof(char) and is the size of each bank.
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| 77 | */
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| 78 | unsigned long BankSize;
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| 79 |
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| 80 | /*
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| 81 | * nBankDepth is the colour depth associated with the maximum number of a
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| 82 | * pixel's bits that are simultaneously accessible through the frame buffer
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| 83 | * aperture.
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| 84 | */
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| 85 | unsigned int nBankDepth;
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| 86 | } miBankInfoRec, *miBankInfoPtr;
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| 87 |
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| 88 | Bool
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| 89 | miInitializeBanking(
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| 90 | ScreenPtr /*pScreen*/,
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| 91 | unsigned int /*xsize*/,
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| 92 | unsigned int /*ysize*/,
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| 93 | unsigned int /*width*/,
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| 94 | miBankInfoPtr /*pBankInfo*/
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| 95 | );
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| 96 |
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| 97 | /*
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| 98 | * This function determines the minimum screen width, given a initial estimate
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| 99 | * and various screen attributes. DDX needs to determine this width before
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| 100 | * initializing the screen.
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| 101 | */
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| 102 | int
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| 103 | miScanLineWidth(
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| 104 | unsigned int /*xsize*/,
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| 105 | unsigned int /*ysize*/,
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| 106 | unsigned int /*width*/,
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| 107 | unsigned long /*BankSize*/,
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| 108 | PixmapFormatRec * /*pBankFormat*/,
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| 109 | unsigned int /*nWidthUnit*/
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| 110 | );
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| 111 |
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| 112 | #endif /* __MIBANK_H__ */
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