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Annotation of researchv9/X11/src/X.V11R1/server/ddx/mfb/mfbcmap.c, revision 1.1

1.1     ! root        1: /***********************************************************
        !             2: Copyright 1987 by Digital Equipment Corporation, Maynard, Massachusetts,
        !             3: and the Massachusetts Institute of Technology, Cambridge, Massachusetts.
        !             4: 
        !             5:                         All Rights Reserved
        !             6: 
        !             7: Permission to use, copy, modify, and distribute this software and its 
        !             8: documentation for any purpose and without fee is hereby granted, 
        !             9: provided that the above copyright notice appear in all copies and that
        !            10: both that copyright notice and this permission notice appear in 
        !            11: supporting documentation, and that the names of Digital or MIT not be
        !            12: used in advertising or publicity pertaining to distribution of the
        !            13: software without specific, written prior permission.  
        !            14: 
        !            15: DIGITAL DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE, INCLUDING
        !            16: ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO EVENT SHALL
        !            17: DIGITAL BE LIABLE FOR ANY SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR
        !            18: ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS,
        !            19: WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION,
        !            20: ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS
        !            21: SOFTWARE.
        !            22: 
        !            23: ******************************************************************/
        !            24: /* $Header: mfbcmap.c,v 1.13 87/09/04 14:19:49 toddb Exp $ */
        !            25: #include "X.h"
        !            26: #include "scrnintstr.h"
        !            27: #include "colormapst.h"
        !            28: #include "resource.h"
        !            29: 
        !            30: extern int     TellLostMap(), TellGainedMap();
        !            31: /* A monochrome frame buffer is a static gray colormap with two entries.
        !            32:  * We have a "required list" of length 1.  Because we can only support 1
        !            33:  * colormap, we never have to change it, but we may have to change the 
        !            34:  * name we call it.  If someone installs a new colormap, we know it must
        !            35:  * look just like the old one (because we've checked in dispatch that it was
        !            36:  * a valid colormap identifier, and all the colormap IDs for this device
        !            37:  * look the same).  Nevertheless, we still have to uninstall the old colormap
        !            38:  * and install the new one.  Similarly, if someone uninstalls a colormap,
        !            39:  * we have to install the default map, even though we know those two looked
        !            40:  * alike.  
        !            41:  * The required list concept is pretty much irrelevant when you can only
        !            42:  * have one map installed at a time.  
        !            43:  */
        !            44: static ColormapPtr pInstalledMap = (ColormapPtr) None;
        !            45: int
        !            46: mfbListInstalledColormaps(pScreen, pmaps)
        !            47:     ScreenPtr  pScreen;
        !            48:     Colormap   *pmaps;
        !            49: {
        !            50:     /* By the time we are processing requests, we can guarantee that there
        !            51:      * is always a colormap installed */
        !            52:     *pmaps = pInstalledMap->mid;
        !            53:     return (1);
        !            54: }
        !            55: 
        !            56: 
        !            57: void
        !            58: mfbInstallColormap(pmap)
        !            59:     ColormapPtr        pmap;
        !            60: {
        !            61:     if(pmap != pInstalledMap)
        !            62:     {
        !            63:        /* Uninstall pInstalledMap. No hardware changes required, just
        !            64:         * notify all interested parties. */
        !            65:        if(pInstalledMap != (ColormapPtr)None)
        !            66:            WalkTree(pmap->pScreen, TellLostMap, &pInstalledMap->mid);
        !            67:        /* Install pmap */
        !            68:        pInstalledMap = pmap;
        !            69:        WalkTree(pmap->pScreen, TellGainedMap, &pmap->mid);
        !            70: 
        !            71:     }
        !            72: }
        !            73: void
        !            74: mfbUninstallColormap(pmap)
        !            75:     ColormapPtr        pmap;
        !            76: {
        !            77:     if(pmap == pInstalledMap)
        !            78:     {
        !            79:         /* Uninstall pmap */
        !            80:        WalkTree(pmap->pScreen, TellLostMap, &pmap->mid);
        !            81:        /* Install default map */
        !            82:        pInstalledMap = (ColormapPtr) LookupID(pmap->pScreen->defColormap,
        !            83:                                               RT_COLORMAP, RC_CORE);
        !            84:        WalkTree(pmap->pScreen, TellGainedMap, &pInstalledMap->mid);
        !            85:     }
        !            86:        
        !            87: }

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