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- /* $XConsortium: StdCmap.c,v 1.11 89/10/08 15:04:52 rws Exp $
- *
- * Copyright 1989 by the Massachusetts Institute of Technology
- *
- * 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 M.I.T. not be used in advertising
- * or publicity pertaining to distribution of the software without specific,
- * written prior permission. M.I.T. makes no representations about the
- * suitability of this software for any purpose. It is provided "as is"
- * without express or implied warranty.
- *
- * M.I.T. DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE, INCLUDING ALL
- * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO EVENT SHALL M.I.T.
- * 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.
- *
- * Author: Donna Converse, MIT X Consortium
- */
-
- #include <stdio.h>
- #include <X11/Xlib.h>
- #include <X11/Xatom.h>
- #include <X11/Xutil.h>
- #include <X11/Xmu/StdCmap.h>
-
- static Status valid_args(); /* argument restrictions */
-
- /*
- * To create any one standard colormap, use XmuStandardColormap().
- *
- * Create a standard colormap for the given screen, visualid, and visual
- * depth, with the given red, green, and blue maximum values, with the
- * given standard property name. Return a pointer to an XStandardColormap
- * structure which describes the newly created colormap, upon success.
- * Upon failure, return NULL.
- *
- * XmuStandardColormap() calls XmuCreateColormap() to create the map.
- *
- * Resources created by this function are not made permanent; that is the
- * caller's responsibility.
- */
-
- XStandardColormap *XmuStandardColormap(dpy, screen, visualid, depth, property,
- cmap, red_max, green_max, blue_max)
- Display *dpy; /* specifies X server connection */
- int screen; /* specifies display screen */
- VisualID visualid; /* identifies the visual type */
- unsigned int depth; /* identifies the visual type */
- Atom property; /* a standard colormap property */
- Colormap cmap; /* specifies colormap ID or None */
- unsigned long red_max, green_max, blue_max; /* allocations */
- {
- XStandardColormap *stdcmap;
- Status status;
- XVisualInfo vinfo_template, *vinfo;
- long vinfo_mask;
- int n;
-
- /* Match the required visual information to an actual visual */
- vinfo_template.visualid = visualid;
- vinfo_template.screen = screen;
- vinfo_template.depth = depth;
- vinfo_mask = VisualIDMask | VisualScreenMask | VisualDepthMask;
- if ((vinfo = XGetVisualInfo(dpy, vinfo_mask, &vinfo_template, &n)) == NULL)
- return 0;
-
- /* Check the validity of the combination of visual characteristics,
- * allocation, and colormap property. Create an XStandardColormap
- * structure.
- */
-
- if (! valid_args(vinfo, red_max, green_max, blue_max, property)
- || ((stdcmap = XAllocStandardColormap()) == NULL)) {
- XFree((char *) vinfo);
- return 0;
- }
-
- /* Fill in the XStandardColormap structure */
-
- if (cmap == DefaultColormap(dpy, screen)) {
- /* Allocating out of the default map, cannot use XFreeColormap() */
- Window win = XCreateWindow(dpy, RootWindow(dpy, screen), 1, 1, 1, 1,
- 0, 0, InputOnly, vinfo->visual,
- (unsigned long) 0,
- (XSetWindowAttributes *)NULL);
- stdcmap->killid = (XID) XCreatePixmap(dpy, win, 1, 1, depth);
- XDestroyWindow(dpy, win);
- stdcmap->colormap = cmap;
- } else {
- stdcmap->killid = ReleaseByFreeingColormap;
- stdcmap->colormap = XCreateColormap(dpy, RootWindow(dpy, screen),
- vinfo->visual, AllocNone);
- }
- stdcmap->red_max = red_max;
- stdcmap->green_max = green_max;
- stdcmap->blue_max = blue_max;
- if (property == XA_RGB_GRAY_MAP)
- stdcmap->red_mult = stdcmap->green_mult = stdcmap->blue_mult = 1;
- else {
- stdcmap->red_mult = (red_max > 0)
- ? (green_max + 1) * (blue_max + 1) : 0;
- stdcmap->green_mult = (green_max > 0) ? blue_max + 1 : 0;
- stdcmap->blue_mult = (blue_max > 0) ? 1 : 0;
- }
- stdcmap->base_pixel = 0; /* base pixel may change */
- stdcmap->visualid = vinfo->visualid;
-
- /* Make the colormap */
-
- status = XmuCreateColormap(dpy, stdcmap);
-
- /* Clean up */
-
- XFree((char *) vinfo);
- if (!status) {
-
- /* Free the colormap or the pixmap, if we created one */
- if (stdcmap->killid == ReleaseByFreeingColormap)
- XFreeColormap(dpy, stdcmap->colormap);
- else if (stdcmap->killid != None)
- XFreePixmap(dpy, stdcmap->killid);
-
- XFree((char *) stdcmap);
- return (XStandardColormap *) NULL;
- }
- return stdcmap;
- }
-
- /****************************************************************************/
- static Status valid_args(vinfo, red_max, green_max, blue_max, property)
- XVisualInfo *vinfo; /* specifies visual */
- unsigned long red_max, green_max, blue_max; /* specifies alloc */
- Atom property; /* specifies property name */
- {
- unsigned long ncolors; /* number of colors requested */
-
- /* Determine that the number of colors requested is <= map size */
-
- if ((vinfo->class == DirectColor) || (vinfo->class == TrueColor)) {
- unsigned long mask;
-
- mask = vinfo->red_mask;
- while (!(mask & 1))
- mask >>= 1;
- if (red_max > mask)
- return 0;
- mask = vinfo->green_mask;
- while (!(mask & 1))
- mask >>= 1;
- if (green_max > mask)
- return 0;
- mask = vinfo->blue_mask;
- while (!(mask & 1))
- mask >>= 1;
- if (blue_max > mask)
- return 0;
- } else if (property == XA_RGB_GRAY_MAP) {
- ncolors = red_max + green_max + blue_max + 1;
- if (ncolors > vinfo->colormap_size)
- return 0;
- } else {
- ncolors = (red_max + 1) * (green_max + 1) * (blue_max + 1);
- if (ncolors > vinfo->colormap_size)
- return 0;
- }
-
- /* Determine that the allocation and visual make sense for the property */
-
- switch (property)
- {
- case XA_RGB_DEFAULT_MAP:
- if ((red_max == 0 || green_max == 0 || blue_max == 0) ||
- (vinfo->class != PseudoColor && vinfo->class != DirectColor &&
- vinfo->class != GrayScale))
- return 0;
- break;
- case XA_RGB_RED_MAP:
- if ((vinfo->class != PseudoColor && vinfo->class != DirectColor) ||
- (red_max == 0))
- return 0;
- break;
- case XA_RGB_GREEN_MAP:
- if ((vinfo->class != PseudoColor && vinfo->class != DirectColor) ||
- (green_max == 0))
- return 0;
- break;
- case XA_RGB_BLUE_MAP:
- if ((vinfo->class != PseudoColor && vinfo->class != DirectColor) ||
- blue_max == 0)
- return 0;
- break;
- case XA_RGB_BEST_MAP:
- if (vinfo->class == GrayScale || vinfo->class == StaticGray ||
- red_max == 0 || green_max == 0 || blue_max == 0)
- return 0;
- break;
- case XA_RGB_GRAY_MAP:
- if (vinfo->class == StaticColor || vinfo->class == TrueColor ||
- red_max == 0 || blue_max == 0 || green_max == 0)
- return 0;
- break;
- default:
- return 0;
- }
- return 1;
- }
-