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+/* $Xorg: CrCmap.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/CrCmap.c,v 3.6 2001/01/17 19:42:53 dawes Exp $ */
+
+/*
+ * Author: Donna Converse, MIT X Consortium
+ */
+
+/*
+ * CreateCmap.c - given a standard colormap description, make the map.
+ */
+
+#ifdef HAVE_CONFIG_H
+#include <config.h>
+#endif
+#include <stdio.h>
+#include <stdlib.h>
+#include <X11/Xlib.h>
+#include <X11/Xutil.h>
+#include <X11/Xmu/StdCmap.h>
+
+/*
+ * Prototypes
+ */
+/* allocate entire map Read Only */
+static int ROmap(Display*, Colormap, unsigned long[], int, int);
+
+/* allocate a cell, prefer Read Only */
+static Status ROorRWcell(Display*, Colormap, unsigned long[], int,
+ XColor*, unsigned long);
+
+/* allocate a cell Read Write */
+static Status RWcell(Display*, Colormap, XColor*, XColor*, unsigned long*);
+
+/* for quicksort */
+static int compare(_Xconst void*, _Xconst void*);
+
+/* find contiguous sequence of cells */
+static Status contiguous(unsigned long[], int, int, unsigned long, int*, int*);
+
+/* frees resources before quitting */
+static void free_cells(Display*, Colormap, unsigned long[], int, int);
+
+/* create a map in a RO visual type */
+static Status readonly_map(Display*, XVisualInfo*, XStandardColormap*);
+
+/* create a map in a RW visual type */
+static Status readwrite_map(Display*, XVisualInfo*, XStandardColormap*);
+
+#define lowbit(x) ((x) & (~(x) + 1))
+#define TRUEMATCH(mult,max,mask) \
+ (colormap->max * colormap->mult <= vinfo->mask && \
+ lowbit(vinfo->mask) == colormap->mult)
+
+/*
+ * To create any one colormap which is described by an XStandardColormap
+ * structure, use XmuCreateColormap().
+ *
+ * Return 0 on failure, non-zero on success.
+ * Resources created by this function are not made permanent.
+ * No argument error checking is provided. Use at your own risk.
+ *
+ * All colormaps are created with read only allocations, with the exception
+ * of read only allocations of colors in the default map or otherwise
+ * which fail to return the expected pixel value, and these are individually
+ * defined as read/write allocations. This is done so that all the cells
+ * defined in the default map are contiguous, for use in image processing.
+ * This typically happens with White and Black in the default map.
+ *
+ * Colormaps of static visuals are considered to be successfully created if
+ * the map of the static visual matches the definition given in the
+ * standard colormap structure.
+ */
+
+Status
+XmuCreateColormap(Display *dpy, XStandardColormap *colormap)
+ /* dpy - specifies the connection under which the map is created
+ * colormap - specifies the map to be created, and returns, particularly
+ * if the map is created as a subset of the default colormap
+ * of the screen, the base_pixel of the map.
+ */
+{
+ XVisualInfo vinfo_template; /* template visual information */
+ XVisualInfo *vinfo; /* matching visual information */
+ XVisualInfo *vpointer; /* for freeing the entire list */
+ long vinfo_mask; /* specifies the visual mask value */
+ int n; /* number of matching visuals */
+ int status;
+
+ vinfo_template.visualid = colormap->visualid;
+ vinfo_mask = VisualIDMask;
+ if ((vinfo = XGetVisualInfo(dpy, vinfo_mask, &vinfo_template, &n)) == NULL)
+ return 0;
+
+ /* A visual id may be valid on multiple screens. Also, there may
+ * be multiple visuals with identical visual ids at different depths.
+ * If the colormap is the Default Colormap, use the Default Visual.
+ * Otherwise, arbitrarily, use the deepest visual.
+ */
+ vpointer = vinfo;
+ if (n > 1)
+ {
+ register int i;
+ register int screen_number;
+ Bool def_cmap;
+
+ def_cmap = False;
+ for (screen_number = ScreenCount(dpy); --screen_number >= 0; )
+ if (colormap->colormap == DefaultColormap(dpy, screen_number)) {
+ def_cmap = True;
+ break;
+ }
+
+ if (def_cmap) {
+ for (i=0; i < n; i++, vinfo++) {
+ if (vinfo->visual == DefaultVisual(dpy, screen_number))
+ break;
+ }
+ } else {
+ int maxdepth = 0;
+ XVisualInfo *v = NULL;
+
+ for (i=0; i < n; i++, vinfo++)
+ if (vinfo->depth > maxdepth) {
+ maxdepth = vinfo->depth;
+ v = vinfo;
+ }
+ vinfo = v;
+ }
+ }
+
+ if (vinfo->class == PseudoColor || vinfo->class == DirectColor ||
+ vinfo->class == GrayScale)
+ status = readwrite_map(dpy, vinfo, colormap);
+ else if (vinfo->class == TrueColor)
+ status = TRUEMATCH(red_mult, red_max, red_mask) &&
+ TRUEMATCH(green_mult, green_max, green_mask) &&
+ TRUEMATCH(blue_mult, blue_max, blue_mask);
+ else
+ status = readonly_map(dpy, vinfo, colormap);
+
+ XFree((char *) vpointer);
+ return status;
+}
+
+/****************************************************************************/
+static Status
+readwrite_map(Display *dpy, XVisualInfo *vinfo, XStandardColormap *colormap)
+{
+ register unsigned long i, n; /* index counters */
+ unsigned long ncolors; /* number of colors to be defined */
+ int npixels; /* number of pixels allocated R/W */
+ int first_index; /* first index of pixels to use */
+ int remainder; /* first index of remainder */
+ XColor color; /* the definition of a color */
+ unsigned long *pixels; /* array of colormap pixels */
+ unsigned long delta;
+
+
+ /* Determine ncolors, the number of colors to be defined.
+ * Insure that 1 < ncolors <= the colormap size.
+ */
+ if (vinfo->class == DirectColor) {
+ ncolors = colormap->red_max;
+ if (colormap->green_max > ncolors)
+ ncolors = colormap->green_max;
+ if (colormap->blue_max > ncolors)
+ ncolors = colormap->blue_max;
+ ncolors++;
+ delta = lowbit(vinfo->red_mask) +
+ lowbit(vinfo->green_mask) +
+ lowbit(vinfo->blue_mask);
+ } else {
+ ncolors = colormap->red_max * colormap->red_mult +
+ colormap->green_max * colormap->green_mult +
+ colormap->blue_max * colormap->blue_mult + 1;
+ delta = 1;
+ }
+ if (ncolors <= 1 || (int) ncolors > vinfo->colormap_size) return 0;
+
+ /* Allocate Read/Write as much of the colormap as we can possibly get.
+ * Then insure that the pixels we were allocated are given in
+ * monotonically increasing order, using a quicksort. Next, insure
+ * that our allocation includes a subset of contiguous pixels at least
+ * as long as the number of colors to be defined. Now we know that
+ * these conditions are met:
+ * 1) There are no free cells in the colormap.
+ * 2) We have a contiguous sequence of pixels, monotonically
+ * increasing, of length >= the number of colors requested.
+ *
+ * One cell at a time, we will free, compute the next color value,
+ * then allocate read only. This takes a long time.
+ * This is done to insure that cells are allocated read only in the
+ * contiguous order which we prefer. If the server has a choice of
+ * cells to grant to an allocation request, the server may give us any
+ * cell, so that is why we do these slow gymnastics.
+ */
+
+ if ((pixels = (unsigned long *) calloc((unsigned) vinfo->colormap_size,
+ sizeof(unsigned long))) == NULL)
+ return 0;
+
+ if ((npixels = ROmap(dpy, colormap->colormap, pixels,
+ vinfo->colormap_size, ncolors)) == 0) {
+ free((char *) pixels);
+ return 0;
+ }
+
+ qsort((char *) pixels, npixels, sizeof(unsigned long), compare);
+
+ if (!contiguous(pixels, npixels, ncolors, delta, &first_index, &remainder))
+ {
+ /* can't find enough contiguous cells, give up */
+ XFreeColors(dpy, colormap->colormap, pixels, npixels,
+ (unsigned long) 0);
+ free((char *) pixels);
+ return 0;
+ }
+ colormap->base_pixel = pixels[first_index];
+
+ /* construct a gray map */
+ if (colormap->red_mult == 1 && colormap->green_mult == 1 &&
+ colormap->blue_mult == 1)
+ for (n=colormap->base_pixel, i=0; i < ncolors; i++, n += delta)
+ {
+ color.pixel = n;
+ color.blue = color.green = color.red =
+ (unsigned short) ((i * 65535) / (colormap->red_max +
+ colormap->green_max +
+ colormap->blue_max));
+
+ if (! ROorRWcell(dpy, colormap->colormap, pixels, npixels, &color,
+ first_index + i))
+ return 0;
+ }
+
+ /* construct a red ramp map */
+ else if (colormap->green_max == 0 && colormap->blue_max == 0)
+ for (n=colormap->base_pixel, i=0; i < ncolors; i++, n += delta)
+ {
+ color.pixel = n;
+ color.red = (unsigned short) ((i * 65535) / colormap->red_max);
+ color.green = color.blue = 0;
+
+ if (! ROorRWcell(dpy, colormap->colormap, pixels, npixels, &color,
+ first_index + i))
+ return 0;
+ }
+
+ /* construct a green ramp map */
+ else if (colormap->red_max == 0 && colormap->blue_max == 0)
+ for (n=colormap->base_pixel, i=0; i < ncolors; i++, n += delta)
+ {
+ color.pixel = n;
+ color.green = (unsigned short) ((i * 65535) / colormap->green_max);
+ color.red = color.blue = 0;
+
+ if (! ROorRWcell(dpy, colormap->colormap, pixels, npixels, &color,
+ first_index + i))
+ return 0;
+ }
+
+ /* construct a blue ramp map */
+ else if (colormap->red_max == 0 && colormap->green_max == 0)
+ for (n=colormap->base_pixel, i=0; i < ncolors; i++, n += delta)
+ {
+ color.pixel = n;
+ color.blue = (unsigned short) ((i * 65535) / colormap->blue_max);
+ color.red = color.green = 0;
+
+ if (! ROorRWcell(dpy, colormap->colormap, pixels, npixels, &color,
+ first_index + i))
+ return 0;
+ }
+
+ /* construct a standard red green blue cube map */
+ else
+ {
+#define calc(max,mult) (((n / colormap->mult) % \
+ (colormap->max + 1)) * 65535) / colormap->max
+
+ for (n=0, i=0; i < ncolors; i++, n += delta)
+ {
+ color.pixel = n + colormap->base_pixel;
+ color.red = calc(red_max, red_mult);
+ color.green = calc(green_max, green_mult);
+ color.blue = calc(blue_max, blue_mult);
+ if (! ROorRWcell(dpy, colormap->colormap, pixels, npixels, &color,
+ first_index + i))
+ return 0;
+ }
+#undef calc
+ }
+ /* We have a read-only map defined. Now free unused cells,
+ * first those occuring before the contiguous sequence begins,
+ * then any following the contiguous sequence.
+ */
+
+ if (first_index)
+ XFreeColors(dpy, colormap->colormap, pixels, first_index,
+ (unsigned long) 0);
+ if (remainder)
+ XFreeColors(dpy, colormap->colormap,
+ &(pixels[first_index + ncolors]), remainder,
+ (unsigned long) 0);
+
+ free((char *) pixels);
+ return 1;
+}
+
+
+/****************************************************************************/
+static int
+ROmap(Display *dpy, Colormap cmap, unsigned long pixels[], int m, int n)
+ /*
+ * dpy - the X server connection
+ * cmap - specifies colormap ID
+ * pixels - returns pixel allocations
+ * m - specifies colormap size
+ * n - specifies number of colors
+ */
+{
+ register int p;
+
+ /* first try to allocate the entire colormap */
+ if (XAllocColorCells(dpy, cmap, 1, (unsigned long *) NULL,
+ (unsigned) 0, pixels, (unsigned) m))
+ return m;
+
+ /* Allocate all available cells in the colormap, using a binary
+ * algorithm to discover how many cells we can allocate in the colormap.
+ */
+ m--;
+ while (n <= m) {
+ p = n + ((m - n + 1) / 2);
+ if (XAllocColorCells(dpy, cmap, 1, (unsigned long *) NULL,
+ (unsigned) 0, pixels, (unsigned) p)) {
+ if (p == m)
+ return p;
+ else {
+ XFreeColors(dpy, cmap, pixels, p, (unsigned long) 0);
+ n = p;
+ }
+ }
+ else
+ m = p - 1;
+ }
+ return 0;
+}
+
+
+/****************************************************************************/
+static Status
+contiguous(unsigned long pixels[], int npixels, int ncolors,
+ unsigned long delta, int *first, int *rem)
+ /* pixels - specifies allocated pixels
+ * npixels - specifies count of alloc'd pixels
+ * ncolors - specifies needed sequence length
+ * delta - between pixels
+ * first - returns first index of sequence
+ * rem - returns first index after sequence, or 0, if none follow
+ */
+{
+ register int i = 1; /* walking index into the pixel array */
+ register int count = 1; /* length of sequence discovered so far */
+
+ *first = 0;
+ if (npixels == ncolors) {
+ *rem = 0;
+ return 1;
+ }
+ *rem = npixels - 1;
+ while (count < ncolors && ncolors - count <= *rem)
+ {
+ if (pixels[i-1] + delta == pixels[i])
+ count++;
+ else {
+ count = 1;
+ *first = i;
+ }
+ i++;
+ (*rem)--;
+ }
+ if (count != ncolors)
+ return 0;
+ return 1;
+}
+
+
+/****************************************************************************/
+static Status
+ROorRWcell(Display *dpy, Colormap cmap, unsigned long pixels[],
+ int npixels, XColor *color, unsigned long p)
+{
+ unsigned long pixel;
+ XColor request;
+
+ /* Free the read/write allocation of one cell in the colormap.
+ * Request a read only allocation of one cell in the colormap.
+ * If the read only allocation cannot be granted, give up, because
+ * there must be no free cells in the colormap.
+ * If the read only allocation is granted, but gives us a cell which
+ * is not the one that we just freed, it is probably the case that
+ * we are trying allocate White or Black or some other color which
+ * already has a read-only allocation in the map. So we try to
+ * allocate the previously freed cell with a read/write allocation,
+ * because we want contiguous cells for image processing algorithms.
+ */
+
+ pixel = color->pixel;
+ request.red = color->red;
+ request.green = color->green;
+ request.blue = color->blue;
+
+ XFreeColors(dpy, cmap, &pixel, 1, (unsigned long) 0);
+ if (! XAllocColor(dpy, cmap, color)
+ || (color->pixel != pixel &&
+ (!RWcell(dpy, cmap, color, &request, &pixel))))
+ {
+ free_cells(dpy, cmap, pixels, npixels, (int)p);
+ return 0;
+ }
+ return 1;
+}
+
+
+/****************************************************************************/
+static void
+free_cells(Display *dpy, Colormap cmap, unsigned long pixels[],
+ int npixels, int p)
+ /*
+ * pixels - to be freed
+ * npixels - original number allocated
+ */
+{
+ /* One of the npixels allocated has already been freed.
+ * p is the index of the freed pixel.
+ * First free the pixels preceeding p, and there are p of them;
+ * then free the pixels following p, there are npixels - p - 1 of them.
+ */
+ XFreeColors(dpy, cmap, pixels, p, (unsigned long) 0);
+ XFreeColors(dpy, cmap, &(pixels[p+1]), npixels - p - 1, (unsigned long) 0);
+ free((char *) pixels);
+}
+
+
+/****************************************************************************/
+static Status
+RWcell(Display *dpy, Colormap cmap, XColor *color, XColor *request,
+ unsigned long *pixel)
+{
+ unsigned long n = *pixel;
+
+ XFreeColors(dpy, cmap, &(color->pixel), 1, (unsigned long)0);
+ if (! XAllocColorCells(dpy, cmap, (Bool) 0, (unsigned long *) NULL,
+ (unsigned) 0, pixel, (unsigned) 1))
+ return 0;
+ if (*pixel != n)
+ {
+ XFreeColors(dpy, cmap, pixel, 1, (unsigned long) 0);
+ return 0;
+ }
+ color->pixel = *pixel;
+ color->flags = DoRed | DoGreen | DoBlue;
+ color->red = request->red;
+ color->green = request->green;
+ color->blue = request->blue;
+ XStoreColors(dpy, cmap, color, 1);
+ return 1;
+}
+
+
+/****************************************************************************/
+static int
+compare(_Xconst void *e1, _Xconst void *e2)
+{
+ return ((int)(*(long *)e1 - *(long *)e2));
+}
+
+
+/****************************************************************************/
+static Status
+readonly_map(Display *dpy, XVisualInfo *vinfo, XStandardColormap *colormap)
+{
+ int i, last_pixel;
+ XColor color;
+
+ last_pixel = (colormap->red_max + 1) * (colormap->green_max + 1) *
+ (colormap->blue_max + 1) + colormap->base_pixel - 1;
+
+ for(i=colormap->base_pixel; i <= last_pixel; i++) {
+
+ color.pixel = (unsigned long) i;
+ color.red = (unsigned short)
+ (((i/colormap->red_mult) * 65535) / colormap->red_max);
+
+ if (vinfo->class == StaticColor) {
+ color.green = (unsigned short)
+ ((((i/colormap->green_mult) % (colormap->green_max + 1)) *
+ 65535) / colormap->green_max);
+ color.blue = (unsigned short)
+ (((i%colormap->green_mult) * 65535) / colormap->blue_max);
+ }
+ else /* vinfo->class == GrayScale, old style allocation XXX */
+ color.green = color.blue = color.red;
+
+ XAllocColor(dpy, colormap->colormap, &color);
+ if (color.pixel != (unsigned long) i)
+ return 0;
+ }
+ return 1;
+}
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