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-rw-r--r--nx-X11/lib/Xmu/CmapAlloc.c346
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diff --git a/nx-X11/lib/Xmu/CmapAlloc.c b/nx-X11/lib/Xmu/CmapAlloc.c
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-/* $Xorg: CmapAlloc.c,v 1.4 2001/02/09 02:03:51 xorgcvs Exp $ */
-
-/*
-
-Copyright 1989, 1994, 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/CmapAlloc.c,v 1.6 2001/01/17 19:42:53 dawes Exp $ */
-
-/*
- * Author: Donna Converse, MIT X Consortium
- */
-
-#ifdef HAVE_CONFIG_H
-#include <config.h>
-#endif
-#include <X11/Xlib.h>
-#include <X11/Xatom.h>
-#include <X11/Xutil.h>
-#include <X11/Xmu/StdCmap.h>
-#include <stdio.h>
-
-#define lowbit(x) ((x) & (~(x) + 1))
-
-/*
- * Prototypes
- */
-static void best_allocation(XVisualInfo*, unsigned long*, unsigned long*,
- unsigned long*);
-static int default_allocation(XVisualInfo*, unsigned long*,
- unsigned long*, unsigned long*);
-static void gray_allocation(int, unsigned long*, unsigned long*,
- unsigned long*);
-static int icbrt(int);
-static int icbrt_with_bits(int, int);
-static int icbrt_with_guess(int, int);
-
-/* To determine the best allocation of reds, greens, and blues in a
- * standard colormap, use XmuGetColormapAllocation.
- * vinfo specifies visual information for a chosen visual
- * property specifies one of the standard colormap property names
- * red_max returns maximum red value
- * green_max returns maximum green value
- * blue_max returns maximum blue value
- *
- * XmuGetColormapAllocation returns 0 on failure, non-zero on success.
- * It is assumed that the visual is appropriate for the colormap property.
- */
-
-Status
-XmuGetColormapAllocation(XVisualInfo *vinfo, Atom property,
- unsigned long *red_max,
- unsigned long *green_max,
- unsigned long *blue_max)
-{
- Status status = 1;
-
- if (vinfo->colormap_size <= 2)
- return 0;
-
- switch (property)
- {
- case XA_RGB_DEFAULT_MAP:
- status = default_allocation(vinfo, red_max, green_max, blue_max);
- break;
- case XA_RGB_BEST_MAP:
- best_allocation(vinfo, red_max, green_max, blue_max);
- break;
- case XA_RGB_GRAY_MAP:
- gray_allocation(vinfo->colormap_size, red_max, green_max, blue_max);
- break;
- case XA_RGB_RED_MAP:
- *red_max = vinfo->colormap_size - 1;
- *green_max = *blue_max = 0;
- break;
- case XA_RGB_GREEN_MAP:
- *green_max = vinfo->colormap_size - 1;
- *red_max = *blue_max = 0;
- break;
- case XA_RGB_BLUE_MAP:
- *blue_max = vinfo->colormap_size - 1;
- *red_max = *green_max = 0;
- break;
- default:
- status = 0;
- }
- return status;
-}
-
-/****************************************************************************/
-/* Determine the appropriate color allocations of a gray scale.
- *
- * Keith Packard, MIT X Consortium
- */
-
-static void
-gray_allocation(int n, unsigned long *red_max, unsigned long *green_max,
- unsigned long *blue_max)
-{
- *red_max = (n * 30) / 100;
- *green_max = (n * 59) / 100;
- *blue_max = (n * 11) / 100;
- *green_max += ((n - 1) - (*red_max + *green_max + *blue_max));
-}
-
-/****************************************************************************/
-/* Determine an appropriate color allocation for the RGB_DEFAULT_MAP.
- * If a map has less than a minimum number of definable entries, we do not
- * produce an allocation for an RGB_DEFAULT_MAP.
- *
- * For 16 planes, the default colormap will have 27 each RGB; for 12 planes,
- * 12 each. For 8 planes, let n = the number of colormap entries, which may
- * be 256 or 254. Then, maximum red value = floor(cube_root(n - 125)) - 1.
- * Maximum green and maximum blue values are identical to maximum red.
- * This leaves at least 125 cells which clients can allocate.
- *
- * Return 0 if an allocation has been determined, non-zero otherwise.
- */
-
-static int
-default_allocation(XVisualInfo *vinfo, unsigned long *red,
- unsigned long *green, unsigned long *blue)
-{
- int ngrays; /* number of gray cells */
-
- switch (vinfo->class) {
- case PseudoColor:
-
- if (vinfo->colormap_size > 65000)
- /* intended for displays with 16 planes */
- *red = *green = *blue = (unsigned long) 27;
- else if (vinfo->colormap_size > 4000)
- /* intended for displays with 12 planes */
- *red = *green = *blue = (unsigned long) 12;
- else if (vinfo->colormap_size < 250)
- return 0;
- else
- /* intended for displays with 8 planes */
- *red = *green = *blue = (unsigned long)
- (icbrt(vinfo->colormap_size - 125) - 1);
- break;
-
- case DirectColor:
-
- if (vinfo->colormap_size < 10)
- return 0;
- *red = *green = *blue = vinfo->colormap_size / 2 - 1;
- break;
-
- case TrueColor:
-
- *red = vinfo->red_mask / lowbit(vinfo->red_mask);
- *green = vinfo->green_mask / lowbit(vinfo->green_mask);
- *blue = vinfo->blue_mask / lowbit(vinfo->blue_mask);
- break;
-
- case GrayScale:
-
- if (vinfo->colormap_size > 65000)
- ngrays = 4096;
- else if (vinfo->colormap_size > 4000)
- ngrays = 512;
- else if (vinfo->colormap_size < 250)
- return 0;
- else
- ngrays = 12;
- gray_allocation(ngrays, red, green, blue);
- break;
-
- default:
- return 0;
- }
- return 1;
-}
-
-/****************************************************************************/
-/* Determine an appropriate color allocation for the RGB_BEST_MAP.
- *
- * For a DirectColor or TrueColor visual, the allocation is determined
- * by the red_mask, green_mask, and blue_mask members of the visual info.
- *
- * Otherwise, if the colormap size is an integral power of 2, determine
- * the allocation according to the number of bits given to each color,
- * with green getting more than red, and red more than blue, if there
- * are to be inequities in the distribution. If the colormap size is
- * not an integral power of 2, let n = the number of colormap entries.
- * Then maximum red value = floor(cube_root(n)) - 1;
- * maximum blue value = floor(cube_root(n)) - 1;
- * maximum green value = n / ((# red values) * (# blue values)) - 1;
- * Which, on a GPX, allows for 252 entries in the best map, out of 254
- * defineable colormap entries.
- */
-
-static void
-best_allocation(XVisualInfo *vinfo, unsigned long *red, unsigned long *green,
- unsigned long *blue)
-{
-
- if (vinfo->class == DirectColor || vinfo->class == TrueColor)
- {
- *red = vinfo->red_mask;
- while ((*red & 01) == 0)
- *red >>= 1;
- *green = vinfo->green_mask;
- while ((*green & 01) == 0)
- *green >>=1;
- *blue = vinfo->blue_mask;
- while ((*blue & 01) == 0)
- *blue >>= 1;
- }
- else
- {
- register int bits, n;
-
- /* Determine n such that n is the least integral power of 2 which is
- * greater than or equal to the number of entries in the colormap.
- */
- n = 1;
- bits = 0;
- while (vinfo->colormap_size > n)
- {
- n = n << 1;
- bits++;
- }
-
- /* If the number of entries in the colormap is a power of 2, determine
- * the allocation by "dealing" the bits, first to green, then red, then
- * blue. If not, find the maximum integral red, green, and blue values
- * which, when multiplied together, do not exceed the number of
-
- * colormap entries.
- */
- if (n == vinfo->colormap_size)
- {
- register int r, g, b;
- b = bits / 3;
- g = b + ((bits % 3) ? 1 : 0);
- r = b + (((bits % 3) == 2) ? 1 : 0);
- *red = 1 << r;
- *green = 1 << g;
- *blue = 1 << b;
- }
- else
- {
- *red = icbrt_with_bits(vinfo->colormap_size, bits);
- *blue = *red;
- *green = (vinfo->colormap_size / ((*red) * (*blue)));
- }
- (*red)--;
- (*green)--;
- (*blue)--;
- }
- return;
-}
-
-/*
- * integer cube roots by Newton's method
- *
- * Stephen Gildea, MIT X Consortium, July 1991
- */
-
-static int
-icbrt(int a)
-{
- register int bits = 0;
- register unsigned n = a;
-
- while (n)
- {
- bits++;
- n >>= 1;
- }
- return icbrt_with_bits(a, bits);
-}
-
-
-static int
-icbrt_with_bits(int a, int bits)
- /* bits - log 2 of a */
-{
- return icbrt_with_guess(a, a>>2*bits/3);
-}
-
-#ifdef _X_ROOT_STATS
-int icbrt_loopcount;
-#endif
-
-/* Newton's Method: x_n+1 = x_n - ( f(x_n) / f'(x_n) ) */
-
-/* for cube roots, x^3 - a = 0, x_new = x - 1/3 (x - a/x^2) */
-
-/*
- * Quick and dirty cube roots. Nothing fancy here, just Newton's method.
- * Only works for positive integers (since that's all we need).
- * We actually return floor(cbrt(a)) because that's what we need here, too.
- */
-
-static int
-icbrt_with_guess(int a, int guess)
-{
- register int delta;
-
-#ifdef _X_ROOT_STATS
- icbrt_loopcount = 0;
-#endif
- if (a <= 0)
- return 0;
- if (guess < 1)
- guess = 1;
-
- do {
-#ifdef _X_ROOT_STATS
- icbrt_loopcount++;
-#endif
- delta = (guess - a/(guess*guess))/3;
-#ifdef DEBUG
- printf("pass %d: guess=%d, delta=%d\n", icbrt_loopcount, guess, delta);
-#endif
- guess -= delta;
- } while (delta != 0);
-
- if (guess*guess*guess > a)
- guess--;
-
- return guess;
-}
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