R6.6 is the Xorg base-line

mfb/mfbcmap.c

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+/***********************************************************
+
+Copyright 1987, 1998  The Open Group
+
+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.
+
+The above copyright notice and this permission notice shall be included in
+all copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL THE
+OPEN GROUP BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN
+AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
+CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+
+Except as contained in this notice, the name of The Open Group shall not be
+used in advertising or otherwise to promote the sale, use or other dealings
+in this Software without prior written authorization from The Open Group.
+
+
+Copyright 1987 by Digital Equipment Corporation, Maynard, Massachusetts.
+
+                        All Rights Reserved
+
+Permission to use, copy, modify, and distribute this software and its 
+documentation for any purpose and without fee is hereby granted, 
+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 Digital not be
+used in advertising or publicity pertaining to distribution of the
+software without specific, written prior permission.  
+
+DIGITAL DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE, INCLUDING
+ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO EVENT SHALL
+DIGITAL 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.
+
+******************************************************************/
+/* $Xorg: mfbcmap.c,v 1.4 2001/02/09 02:05:18 xorgcvs Exp $ */
+#include "X.h"
+#include "scrnintstr.h"
+#include "colormapst.h"
+#include "resource.h"
+
+/* A monochrome frame buffer is a static gray colormap with two entries.
+ * We have a "required list" of length 1.  Because we can only support 1
+ * colormap, we never have to change it, but we may have to change the 
+ * name we call it.  If someone installs a new colormap, we know it must
+ * look just like the old one (because we've checked in dispatch that it was
+ * a valid colormap identifier, and all the colormap IDs for this device
+ * look the same).  Nevertheless, we still have to uninstall the old colormap
+ * and install the new one.  Similarly, if someone uninstalls a colormap,
+ * we have to install the default map, even though we know those two looked
+ * alike.  
+ * The required list concept is pretty much irrelevant when you can only
+ * have one map installed at a time.  
+ */
+static ColormapPtr InstalledMaps[MAXSCREENS];
+
+int
+mfbListInstalledColormaps(pScreen, pmaps)
+    ScreenPtr	pScreen;
+    Colormap	*pmaps;
+{
+    /* By the time we are processing requests, we can guarantee that there
+     * is always a colormap installed */
+    *pmaps = InstalledMaps[pScreen->myNum]->mid;
+    return (1);
+}
+
+
+void
+mfbInstallColormap(pmap)
+    ColormapPtr	pmap;
+{
+    int index = pmap->pScreen->myNum;
+    ColormapPtr oldpmap = InstalledMaps[index];
+
+    if(pmap != oldpmap)
+    {
+	/* Uninstall pInstalledMap. No hardware changes required, just
+	 * notify all interested parties. */
+	if(oldpmap != (ColormapPtr)None)
+	    WalkTree(pmap->pScreen, TellLostMap, (pointer)&oldpmap->mid);
+	/* Install pmap */
+	InstalledMaps[index] = pmap;
+	WalkTree(pmap->pScreen, TellGainedMap, (pointer)&pmap->mid);
+
+    }
+}
+
+void
+mfbUninstallColormap(pmap)
+    ColormapPtr	pmap;
+{
+    int index = pmap->pScreen->myNum;
+    ColormapPtr curpmap = InstalledMaps[index];
+
+    if(pmap == curpmap)
+    {
+	if (pmap->mid != pmap->pScreen->defColormap)
+	{
+	    curpmap = (ColormapPtr) LookupIDByType(pmap->pScreen->defColormap,
+						   RT_COLORMAP);
+	    (*pmap->pScreen->InstallColormap)(curpmap);
+	}
+    }
+}
+
+/*ARGSUSED*/
+void
+mfbResolveColor (pred, pgreen, pblue, pVisual)
+    unsigned short	*pred;
+    unsigned short	*pgreen;
+    unsigned short	*pblue;
+    VisualPtr		pVisual;
+{
+    /* 
+     * Gets intensity from RGB.  If intensity is >= half, pick white, else
+     * pick black.  This may well be more trouble than it's worth.
+     */
+    *pred = *pgreen = *pblue = 
+        (((30L * *pred +
+           59L * *pgreen +
+           11L * *pblue) >> 8) >= (((1<<8)-1)*50)) ? ~0 : 0;
+}
+
+Bool
+mfbCreateColormap(pMap)
+    ColormapPtr	pMap;
+{
+    ScreenPtr	pScreen;
+    unsigned short  red0, green0, blue0;
+    unsigned short  red1, green1, blue1;
+    Pixel pix;
+    
+    pScreen = pMap->pScreen;
+    if (pScreen->whitePixel == 0)
+    {
+	red0 = green0 = blue0 = ~0;
+	red1 = green1 = blue1 = 0;
+    }
+    else
+    {
+	red0 = green0 = blue0 = 0;
+	red1 = green1 = blue1 = ~0;
+    }
+
+    /* this is a monochrome colormap, it only has two entries, just fill
+     * them in by hand.  If it were a more complex static map, it would be
+     * worth writing a for loop or three to initialize it */
+
+    /* this will be pixel 0 */
+    pix = 0;
+    if (AllocColor(pMap, &red0, &green0, &blue0, &pix, 0) != Success)
+	return FALSE;
+
+    /* this will be pixel 1 */
+    if (AllocColor(pMap, &red1, &green1, &blue1, &pix, 0) != Success)
+	return FALSE;
+    return TRUE;
+}
+
+/*ARGSUSED*/
+void
+mfbDestroyColormap (pMap)
+    ColormapPtr	pMap;
+{
+    return;
+}
+
+Bool
+mfbCreateDefColormap (pScreen)
+    ScreenPtr	pScreen;
+{
+    VisualPtr	pVisual;
+    ColormapPtr	pColormap;
+    
+    for (pVisual = pScreen->visuals;
+	 pVisual->vid != pScreen->rootVisual;
+	 pVisual++)
+	;
+    if (CreateColormap (pScreen->defColormap, pScreen, pVisual,
+			&pColormap, AllocNone, 0) != Success)
+    {
+	return FALSE;
+    }
+    (*pScreen->InstallColormap) (pColormap);
+    return TRUE;
+}