xorg-server-1.4/mfb/mfbcmap.c

   1 /***********************************************************
   2
   3 Copyright 1987, 1998  The Open Group
   4
   5 Permission to use, copy, modify, distribute, and sell this software and its
   6 documentation for any purpose is hereby granted without fee, provided that
   7 the above copyright notice appear in all copies and that both that
   8 copyright notice and this permission notice appear in supporting
   9 documentation.
  10
  11 The above copyright notice and this permission notice shall be included in
  12 all copies or substantial portions of the Software.
  13
  14 THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  15 IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  16 FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL THE
  17 OPEN GROUP BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN
  18 AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
  19 CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  20
  21 Except as contained in this notice, the name of The Open Group shall not be
  22 used in advertising or otherwise to promote the sale, use or other dealings
  23 in this Software without prior written authorization from The Open Group.
  24
  25
  26 Copyright 1987 by Digital Equipment Corporation, Maynard, Massachusetts.
  27
  28                         All Rights Reserved
  29
  30 Permission to use, copy, modify, and distribute this software and its
  31 documentation for any purpose and without fee is hereby granted,
  32 provided that the above copyright notice appear in all copies and that
  33 both that copyright notice and this permission notice appear in
  34 supporting documentation, and that the name of Digital not be
  35 used in advertising or publicity pertaining to distribution of the
  36 software without specific, written prior permission.
  37
  38 DIGITAL DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE, INCLUDING
  39 ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO EVENT SHALL
  40 DIGITAL BE LIABLE FOR ANY SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR
  41 ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS,
  42 WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION,
  43 ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS
  44 SOFTWARE.
  45
  46 ******************************************************************/
  47 #ifdef HAVE_DIX_CONFIG_H
  48 #include <dix-config.h>
  49 #endif
  50
  51 #include <X11/X.h>
  52 #include "scrnintstr.h"
  53 #include "colormapst.h"
  54 #include "resource.h"
  55 #include "micmap.h"
  56 #include "mfb.h"
  57
  58 /* A monochrome frame buffer is a static gray colormap with two entries.
  59  * We have a "required list" of length 1.  Because we can only support 1
  60  * colormap, we never have to change it, but we may have to change the
  61  * name we call it.  If someone installs a new colormap, we know it must
  62  * look just like the old one (because we've checked in dispatch that it was
  63  * a valid colormap identifier, and all the colormap IDs for this device
  64  * look the same).  Nevertheless, we still have to uninstall the old colormap
  65  * and install the new one.  Similarly, if someone uninstalls a colormap,
  66  * we have to install the default map, even though we know those two looked
  67  * alike.
  68  * The required list concept is pretty much irrelevant when you can only
  69  * have one map installed at a time.
  70  */
  71
  72 int
  73 mfbListInstalledColormaps(pScreen, pmaps)
  74     ScreenPtr   pScreen;
  75     Colormap    *pmaps;
  76 {
  77     return miListInstalledColormaps(pScreen, pmaps);
  78 }
  79
  80
  81 void
  82 mfbInstallColormap(pmap)
  83     ColormapPtr pmap;
  84 {
  85     miInstallColormap(pmap);
  86 }
  87
  88 void
  89 mfbUninstallColormap(pmap)
  90     ColormapPtr pmap;
  91 {
  92     miUninstallColormap(pmap);
  93 }
  94
  95 /*ARGSUSED*/
  96 void
  97 mfbResolveColor (pred, pgreen, pblue, pVisual)
  98     unsigned short      *pred;
  99     unsigned short      *pgreen;
 100     unsigned short      *pblue;
 101     VisualPtr           pVisual;
 102 {
 103     /*
 104      * Gets intensity from RGB.  If intensity is >= half, pick white, else
 105      * pick black.  This may well be more trouble than it's worth.
 106      */
 107     *pred = *pgreen = *pblue =
 108         (((30L * *pred +
 109            59L * *pgreen +
 110            11L * *pblue) >> 8) >= (((1<<8)-1)*50)) ? ~0 : 0;
 111 }
 112
 113 Bool
 114 mfbCreateColormap(pMap)
 115     ColormapPtr pMap;
 116 {
 117     ScreenPtr   pScreen;
 118     unsigned short  red0, green0, blue0;
 119     unsigned short  red1, green1, blue1;
 120     Pixel pix;
 121
 122     pScreen = pMap->pScreen;
 123     if (pScreen->whitePixel == 0)
 124     {
 125         red0 = green0 = blue0 = ~0;
 126         red1 = green1 = blue1 = 0;
 127     }
 128     else
 129     {
 130         red0 = green0 = blue0 = 0;
 131         red1 = green1 = blue1 = ~0;
 132     }
 133
 134     /* this is a monochrome colormap, it only has two entries, just fill
 135      * them in by hand.  If it were a more complex static map, it would be
 136      * worth writing a for loop or three to initialize it */
 137
 138     /* this will be pixel 0 */
 139     pix = 0;
 140     if (AllocColor(pMap, &red0, &green0, &blue0, &pix, 0) != Success)
 141         return FALSE;
 142
 143     /* this will be pixel 1 */
 144     if (AllocColor(pMap, &red1, &green1, &blue1, &pix, 0) != Success)
 145         return FALSE;
 146     return TRUE;
 147 }
 148
 149 /*ARGSUSED*/
 150 void
 151 mfbDestroyColormap (pMap)
 152     ColormapPtr pMap;
 153 {
 154     return;
 155 }
 156
 157 Bool
 158 mfbCreateDefColormap (pScreen)
 159     ScreenPtr   pScreen;
 160 {
 161     return miCreateDefColormap(pScreen);
 162 }