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Diffstat (limited to 'libXmu/src/AllCmap.c')
| -rw-r--r-- | libXmu/src/AllCmap.c | 158 |
1 files changed, 158 insertions, 0 deletions
diff --git a/libXmu/src/AllCmap.c b/libXmu/src/AllCmap.c new file mode 100644 index 000000000..09ae52aa4 --- /dev/null +++ b/libXmu/src/AllCmap.c @@ -0,0 +1,158 @@ +/* $Xorg: AllCmap.c,v 1.4 2001/02/09 02:03:51 xorgcvs Exp $ */ + +/* + +Copyright 1989, 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. + +*/ +/* $XFree86: xc/lib/Xmu/AllCmap.c,v 1.7 2001/01/17 19:42:53 dawes Exp $ */ + +#ifdef HAVE_CONFIG_H +#include <config.h> +#endif +#include <stdio.h> +#include <X11/Xlib.h> +#include <X11/Xatom.h> +#include <X11/Xutil.h> +#include <X11/Xmu/StdCmap.h> + +static XVisualInfo *getDeepestVisual(int, XVisualInfo*, int); + +/* + * To create all of the appropriate standard colormaps for every visual of + * every screen on a given display, use XmuAllStandardColormaps. + * + * Define and retain as permanent resources all standard colormaps which are + * meaningful for the visuals of each screen of the display. Return 0 on + * failure, non-zero on success. If the property of any standard colormap + * is already defined, redefine it. + * + * This interface is intended to be used by window managers or a client + * upon start-up of a session. + * + * The standard colormaps of a screen are defined by properties associated + * with the screen's root window. Each screen has exactly one root window. + * The property names of standard colormaps are predefined, and each property + * name may describe at most one colormap. + * + * The standard colormaps are + * RGB_BEST_MAP + * RGB_RED_MAP + * RGB_GREEN_MAP + * RGB_BLUE_MAP + * RGB_DEFAULT_MAP + * RGB_GRAY_MAP + * + * Therefore a screen may have at most 6 standard colormap properties defined. + * + * A standard colormap is associated with a particular visual of the screen. + * A screen may have multiple visuals defined, including visuals of the same + * class at different depths. Note that a visual id might be repeated for + * more than one depth, so the visual id and the depth of a visual identify + * the visual. The characteristics of the visual will determine which + * standard colormaps are meaningful under that visual, and will determine + * how the standard colormap is defined. Because a standard colormap is + * associated with a specific visual, there must be a method of determining + * which visuals take precedence in defining standard colormaps. + * + * The method used here is: for the visual of greatest depth, define all + * standard colormaps meaningful to that visual class, according to this + * order of (descending) precedence: + * 1. DirectColor + * 2. PseudoColor + * 3. TrueColor and GrayScale + * 4. StaticColor and StaticGray + * + * Allows partial success by screenful. For example, if a map on screen 1 + * fails, the maps on screen 0, created earlier, will remain. However, + * none on screen 1 will remain. If a map on 0 fails, none will remain. + * + * See the comments under XmuVisualStandardColormaps() for notes on which + * standard colormaps are meaningful under these classes of visuals. + */ + +Status +XmuAllStandardColormaps(Display *dpy) +{ + int nvisuals, scr; + Status status; + long vinfo_mask; + XVisualInfo template, *vinfo, *v1, *v2; + + status = 0; + /* for each screen, determine all visuals of this server */ + for (scr=0; scr < ScreenCount(dpy); scr++) + { + template.screen = scr; + vinfo_mask = VisualScreenMask; + vinfo = XGetVisualInfo(dpy, vinfo_mask, &template, &nvisuals); + if (vinfo == NULL) /* unexpected: a screen with no visuals */ + continue; + + v1 = getDeepestVisual(DirectColor, vinfo, nvisuals); + v2 = getDeepestVisual(PseudoColor, vinfo, nvisuals); + + if (v2 && + (!v1 || (v2->colormap_size >= + ((v1->red_mask | v1->green_mask | v1->blue_mask) + 1)))) + status = XmuVisualStandardColormaps(dpy, scr, v2->visualid, + (unsigned) v2->depth, 1, 1); + else if (v1) + status = XmuVisualStandardColormaps(dpy, scr, v1->visualid, + (unsigned) v1->depth, 1, 1); + + else { + if (((v1 = getDeepestVisual(TrueColor, vinfo, nvisuals)) != NULL) + || ((v1 = getDeepestVisual(StaticColor, vinfo, nvisuals)) != + NULL)) + status = XmuVisualStandardColormaps(dpy, scr, v1->visualid, + (unsigned) v1->depth, 1, 1); + if (status && + (((v1 = getDeepestVisual(GrayScale, vinfo, nvisuals)) != NULL) + || ((v1 = getDeepestVisual(StaticGray, vinfo, nvisuals)) != + NULL))) + status = XmuVisualStandardColormaps(dpy, scr, v1->visualid, + (unsigned) v1->depth, 1, 1); + } + XFree ((char *) vinfo); + if (!status) break; + } + return status; +} + +static XVisualInfo * +getDeepestVisual(int visual_class, XVisualInfo *vinfo, int nvisuals) +{ + register int i; + register int maxdepth = 0; + XVisualInfo *v = NULL; + + for (i=0; i < nvisuals; i++, vinfo++) + if (vinfo->class == visual_class && vinfo->depth > maxdepth) + { + maxdepth = vinfo->depth; + v = vinfo; + } + return(v); +} + |