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annotate src/video/Xext/XmuStdCmap/CmapAlloc.c @ 4729:1f7ad083fd3c

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Merged Paul's Google Summer of Code work from SDL-gsoc2010_android
author Sam Lantinga <slouken@libsdl.org>
date Sun, 22 Aug 2010 12:23:55 -0700
parents 2032348afed1
children
rev   line source
2185
2032348afed1 This code adds support for DirectColor visuals to SDL 1.3. The support uses part of the Xmu library. To ensure that the library is
Bob Pendleton <bob@pendleton.com>
parents:
diff changeset
1 /* $Xorg: CmapAlloc.c,v 1.4 2001/02/09 02:03:51 xorgcvs Exp $ */
2032348afed1 This code adds support for DirectColor visuals to SDL 1.3. The support uses part of the Xmu library. To ensure that the library is
Bob Pendleton <bob@pendleton.com>
parents:
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2
2032348afed1 This code adds support for DirectColor visuals to SDL 1.3. The support uses part of the Xmu library. To ensure that the library is
Bob Pendleton <bob@pendleton.com>
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3 /*
2032348afed1 This code adds support for DirectColor visuals to SDL 1.3. The support uses part of the Xmu library. To ensure that the library is
Bob Pendleton <bob@pendleton.com>
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4
2032348afed1 This code adds support for DirectColor visuals to SDL 1.3. The support uses part of the Xmu library. To ensure that the library is
Bob Pendleton <bob@pendleton.com>
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5 Copyright 1989, 1994, 1998 The Open Group
2032348afed1 This code adds support for DirectColor visuals to SDL 1.3. The support uses part of the Xmu library. To ensure that the library is
Bob Pendleton <bob@pendleton.com>
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6
2032348afed1 This code adds support for DirectColor visuals to SDL 1.3. The support uses part of the Xmu library. To ensure that the library is
Bob Pendleton <bob@pendleton.com>
parents:
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7 Permission to use, copy, modify, distribute, and sell this software and its
2032348afed1 This code adds support for DirectColor visuals to SDL 1.3. The support uses part of the Xmu library. To ensure that the library is
Bob Pendleton <bob@pendleton.com>
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8 documentation for any purpose is hereby granted without fee, provided that
2032348afed1 This code adds support for DirectColor visuals to SDL 1.3. The support uses part of the Xmu library. To ensure that the library is
Bob Pendleton <bob@pendleton.com>
parents:
diff changeset
9 the above copyright notice appear in all copies and that both that
2032348afed1 This code adds support for DirectColor visuals to SDL 1.3. The support uses part of the Xmu library. To ensure that the library is
Bob Pendleton <bob@pendleton.com>
parents:
diff changeset
10 copyright notice and this permission notice appear in supporting
2032348afed1 This code adds support for DirectColor visuals to SDL 1.3. The support uses part of the Xmu library. To ensure that the library is
Bob Pendleton <bob@pendleton.com>
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11 documentation.
2032348afed1 This code adds support for DirectColor visuals to SDL 1.3. The support uses part of the Xmu library. To ensure that the library is
Bob Pendleton <bob@pendleton.com>
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12
2032348afed1 This code adds support for DirectColor visuals to SDL 1.3. The support uses part of the Xmu library. To ensure that the library is
Bob Pendleton <bob@pendleton.com>
parents:
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13 The above copyright notice and this permission notice shall be included in
2032348afed1 This code adds support for DirectColor visuals to SDL 1.3. The support uses part of the Xmu library. To ensure that the library is
Bob Pendleton <bob@pendleton.com>
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diff changeset
14 all copies or substantial portions of the Software.
2032348afed1 This code adds support for DirectColor visuals to SDL 1.3. The support uses part of the Xmu library. To ensure that the library is
Bob Pendleton <bob@pendleton.com>
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15
2032348afed1 This code adds support for DirectColor visuals to SDL 1.3. The support uses part of the Xmu library. To ensure that the library is
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16 THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
2032348afed1 This code adds support for DirectColor visuals to SDL 1.3. The support uses part of the Xmu library. To ensure that the library is
Bob Pendleton <bob@pendleton.com>
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17 IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
2032348afed1 This code adds support for DirectColor visuals to SDL 1.3. The support uses part of the Xmu library. To ensure that the library is
Bob Pendleton <bob@pendleton.com>
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18 FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
2032348afed1 This code adds support for DirectColor visuals to SDL 1.3. The support uses part of the Xmu library. To ensure that the library is
Bob Pendleton <bob@pendleton.com>
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19 OPEN GROUP BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN
2032348afed1 This code adds support for DirectColor visuals to SDL 1.3. The support uses part of the Xmu library. To ensure that the library is
Bob Pendleton <bob@pendleton.com>
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20 AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
2032348afed1 This code adds support for DirectColor visuals to SDL 1.3. The support uses part of the Xmu library. To ensure that the library is
Bob Pendleton <bob@pendleton.com>
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21 CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
2032348afed1 This code adds support for DirectColor visuals to SDL 1.3. The support uses part of the Xmu library. To ensure that the library is
Bob Pendleton <bob@pendleton.com>
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22
2032348afed1 This code adds support for DirectColor visuals to SDL 1.3. The support uses part of the Xmu library. To ensure that the library is
Bob Pendleton <bob@pendleton.com>
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23 Except as contained in this notice, the name of The Open Group shall not be
2032348afed1 This code adds support for DirectColor visuals to SDL 1.3. The support uses part of the Xmu library. To ensure that the library is
Bob Pendleton <bob@pendleton.com>
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24 used in advertising or otherwise to promote the sale, use or other dealings
2032348afed1 This code adds support for DirectColor visuals to SDL 1.3. The support uses part of the Xmu library. To ensure that the library is
Bob Pendleton <bob@pendleton.com>
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25 in this Software without prior written authorization from The Open Group.
2032348afed1 This code adds support for DirectColor visuals to SDL 1.3. The support uses part of the Xmu library. To ensure that the library is
Bob Pendleton <bob@pendleton.com>
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26
2032348afed1 This code adds support for DirectColor visuals to SDL 1.3. The support uses part of the Xmu library. To ensure that the library is
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27 */
2032348afed1 This code adds support for DirectColor visuals to SDL 1.3. The support uses part of the Xmu library. To ensure that the library is
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28 /* $XFree86: xc/lib/Xmu/CmapAlloc.c,v 1.6 2001/01/17 19:42:53 dawes Exp $ */
2032348afed1 This code adds support for DirectColor visuals to SDL 1.3. The support uses part of the Xmu library. To ensure that the library is
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29
2032348afed1 This code adds support for DirectColor visuals to SDL 1.3. The support uses part of the Xmu library. To ensure that the library is
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30 /*
2032348afed1 This code adds support for DirectColor visuals to SDL 1.3. The support uses part of the Xmu library. To ensure that the library is
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31 * Author: Donna Converse, MIT X Consortium
2032348afed1 This code adds support for DirectColor visuals to SDL 1.3. The support uses part of the Xmu library. To ensure that the library is
Bob Pendleton <bob@pendleton.com>
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32 */
2032348afed1 This code adds support for DirectColor visuals to SDL 1.3. The support uses part of the Xmu library. To ensure that the library is
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33
2032348afed1 This code adds support for DirectColor visuals to SDL 1.3. The support uses part of the Xmu library. To ensure that the library is
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34 #ifdef HAVE_CONFIG_H
2032348afed1 This code adds support for DirectColor visuals to SDL 1.3. The support uses part of the Xmu library. To ensure that the library is
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35 #include <config.h>
2032348afed1 This code adds support for DirectColor visuals to SDL 1.3. The support uses part of the Xmu library. To ensure that the library is
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36 #endif
2032348afed1 This code adds support for DirectColor visuals to SDL 1.3. The support uses part of the Xmu library. To ensure that the library is
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37 #include <X11/Xlib.h>
2032348afed1 This code adds support for DirectColor visuals to SDL 1.3. The support uses part of the Xmu library. To ensure that the library is
Bob Pendleton <bob@pendleton.com>
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38 #include <X11/Xatom.h>
2032348afed1 This code adds support for DirectColor visuals to SDL 1.3. The support uses part of the Xmu library. To ensure that the library is
Bob Pendleton <bob@pendleton.com>
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39 #include <X11/Xutil.h>
2032348afed1 This code adds support for DirectColor visuals to SDL 1.3. The support uses part of the Xmu library. To ensure that the library is
Bob Pendleton <bob@pendleton.com>
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40 #include "../extensions/StdCmap.h"
2032348afed1 This code adds support for DirectColor visuals to SDL 1.3. The support uses part of the Xmu library. To ensure that the library is
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41 #include <stdio.h>
2032348afed1 This code adds support for DirectColor visuals to SDL 1.3. The support uses part of the Xmu library. To ensure that the library is
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42
2032348afed1 This code adds support for DirectColor visuals to SDL 1.3. The support uses part of the Xmu library. To ensure that the library is
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43 #define lowbit(x) ((x) & (~(x) + 1))
2032348afed1 This code adds support for DirectColor visuals to SDL 1.3. The support uses part of the Xmu library. To ensure that the library is
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44
2032348afed1 This code adds support for DirectColor visuals to SDL 1.3. The support uses part of the Xmu library. To ensure that the library is
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45 /*
2032348afed1 This code adds support for DirectColor visuals to SDL 1.3. The support uses part of the Xmu library. To ensure that the library is
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46 * Prototypes
2032348afed1 This code adds support for DirectColor visuals to SDL 1.3. The support uses part of the Xmu library. To ensure that the library is
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47 */
2032348afed1 This code adds support for DirectColor visuals to SDL 1.3. The support uses part of the Xmu library. To ensure that the library is
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48 static void best_allocation(XVisualInfo *, unsigned long *, unsigned long *,
2032348afed1 This code adds support for DirectColor visuals to SDL 1.3. The support uses part of the Xmu library. To ensure that the library is
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49 unsigned long *);
2032348afed1 This code adds support for DirectColor visuals to SDL 1.3. The support uses part of the Xmu library. To ensure that the library is
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50 static int default_allocation(XVisualInfo *, unsigned long *,
2032348afed1 This code adds support for DirectColor visuals to SDL 1.3. The support uses part of the Xmu library. To ensure that the library is
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51 unsigned long *, unsigned long *);
2032348afed1 This code adds support for DirectColor visuals to SDL 1.3. The support uses part of the Xmu library. To ensure that the library is
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52 static void gray_allocation(int, unsigned long *, unsigned long *,
2032348afed1 This code adds support for DirectColor visuals to SDL 1.3. The support uses part of the Xmu library. To ensure that the library is
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53 unsigned long *);
2032348afed1 This code adds support for DirectColor visuals to SDL 1.3. The support uses part of the Xmu library. To ensure that the library is
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54 static int icbrt(int);
2032348afed1 This code adds support for DirectColor visuals to SDL 1.3. The support uses part of the Xmu library. To ensure that the library is
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55 static int icbrt_with_bits(int, int);
2032348afed1 This code adds support for DirectColor visuals to SDL 1.3. The support uses part of the Xmu library. To ensure that the library is
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56 static int icbrt_with_guess(int, int);
2032348afed1 This code adds support for DirectColor visuals to SDL 1.3. The support uses part of the Xmu library. To ensure that the library is
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57
2032348afed1 This code adds support for DirectColor visuals to SDL 1.3. The support uses part of the Xmu library. To ensure that the library is
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58 /* To determine the best allocation of reds, greens, and blues in a
2032348afed1 This code adds support for DirectColor visuals to SDL 1.3. The support uses part of the Xmu library. To ensure that the library is
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59 * standard colormap, use XmuGetColormapAllocation.
2032348afed1 This code adds support for DirectColor visuals to SDL 1.3. The support uses part of the Xmu library. To ensure that the library is
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60 * vinfo specifies visual information for a chosen visual
2032348afed1 This code adds support for DirectColor visuals to SDL 1.3. The support uses part of the Xmu library. To ensure that the library is
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61 * property specifies one of the standard colormap property names
2032348afed1 This code adds support for DirectColor visuals to SDL 1.3. The support uses part of the Xmu library. To ensure that the library is
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62 * red_max returns maximum red value
2032348afed1 This code adds support for DirectColor visuals to SDL 1.3. The support uses part of the Xmu library. To ensure that the library is
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63 * green_max returns maximum green value
2032348afed1 This code adds support for DirectColor visuals to SDL 1.3. The support uses part of the Xmu library. To ensure that the library is
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64 * blue_max returns maximum blue value
2032348afed1 This code adds support for DirectColor visuals to SDL 1.3. The support uses part of the Xmu library. To ensure that the library is
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65 *
2032348afed1 This code adds support for DirectColor visuals to SDL 1.3. The support uses part of the Xmu library. To ensure that the library is
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66 * XmuGetColormapAllocation returns 0 on failure, non-zero on success.
2032348afed1 This code adds support for DirectColor visuals to SDL 1.3. The support uses part of the Xmu library. To ensure that the library is
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67 * It is assumed that the visual is appropriate for the colormap property.
2032348afed1 This code adds support for DirectColor visuals to SDL 1.3. The support uses part of the Xmu library. To ensure that the library is
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68 */
2032348afed1 This code adds support for DirectColor visuals to SDL 1.3. The support uses part of the Xmu library. To ensure that the library is
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69
2032348afed1 This code adds support for DirectColor visuals to SDL 1.3. The support uses part of the Xmu library. To ensure that the library is
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70 Status
2032348afed1 This code adds support for DirectColor visuals to SDL 1.3. The support uses part of the Xmu library. To ensure that the library is
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71 XmuGetColormapAllocation(XVisualInfo * vinfo, Atom property,
2032348afed1 This code adds support for DirectColor visuals to SDL 1.3. The support uses part of the Xmu library. To ensure that the library is
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72 unsigned long *red_max,
2032348afed1 This code adds support for DirectColor visuals to SDL 1.3. The support uses part of the Xmu library. To ensure that the library is
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73 unsigned long *green_max, unsigned long *blue_max)
2032348afed1 This code adds support for DirectColor visuals to SDL 1.3. The support uses part of the Xmu library. To ensure that the library is
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74 {
2032348afed1 This code adds support for DirectColor visuals to SDL 1.3. The support uses part of the Xmu library. To ensure that the library is
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75 Status status = 1;
2032348afed1 This code adds support for DirectColor visuals to SDL 1.3. The support uses part of the Xmu library. To ensure that the library is
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76
2032348afed1 This code adds support for DirectColor visuals to SDL 1.3. The support uses part of the Xmu library. To ensure that the library is
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77 if (vinfo->colormap_size <= 2)
2032348afed1 This code adds support for DirectColor visuals to SDL 1.3. The support uses part of the Xmu library. To ensure that the library is
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78 return 0;
2032348afed1 This code adds support for DirectColor visuals to SDL 1.3. The support uses part of the Xmu library. To ensure that the library is
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79
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80 switch (property) {
2032348afed1 This code adds support for DirectColor visuals to SDL 1.3. The support uses part of the Xmu library. To ensure that the library is
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81 case XA_RGB_DEFAULT_MAP:
2032348afed1 This code adds support for DirectColor visuals to SDL 1.3. The support uses part of the Xmu library. To ensure that the library is
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82 status = default_allocation(vinfo, red_max, green_max, blue_max);
2032348afed1 This code adds support for DirectColor visuals to SDL 1.3. The support uses part of the Xmu library. To ensure that the library is
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83 break;
2032348afed1 This code adds support for DirectColor visuals to SDL 1.3. The support uses part of the Xmu library. To ensure that the library is
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84 case XA_RGB_BEST_MAP:
2032348afed1 This code adds support for DirectColor visuals to SDL 1.3. The support uses part of the Xmu library. To ensure that the library is
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85 best_allocation(vinfo, red_max, green_max, blue_max);
2032348afed1 This code adds support for DirectColor visuals to SDL 1.3. The support uses part of the Xmu library. To ensure that the library is
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86 break;
2032348afed1 This code adds support for DirectColor visuals to SDL 1.3. The support uses part of the Xmu library. To ensure that the library is
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87 case XA_RGB_GRAY_MAP:
2032348afed1 This code adds support for DirectColor visuals to SDL 1.3. The support uses part of the Xmu library. To ensure that the library is
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88 gray_allocation(vinfo->colormap_size, red_max, green_max, blue_max);
2032348afed1 This code adds support for DirectColor visuals to SDL 1.3. The support uses part of the Xmu library. To ensure that the library is
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89 break;
2032348afed1 This code adds support for DirectColor visuals to SDL 1.3. The support uses part of the Xmu library. To ensure that the library is
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90 case XA_RGB_RED_MAP:
2032348afed1 This code adds support for DirectColor visuals to SDL 1.3. The support uses part of the Xmu library. To ensure that the library is
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91 *red_max = vinfo->colormap_size - 1;
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92 *green_max = *blue_max = 0;
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93 break;
2032348afed1 This code adds support for DirectColor visuals to SDL 1.3. The support uses part of the Xmu library. To ensure that the library is
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94 case XA_RGB_GREEN_MAP:
2032348afed1 This code adds support for DirectColor visuals to SDL 1.3. The support uses part of the Xmu library. To ensure that the library is
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95 *green_max = vinfo->colormap_size - 1;
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96 *red_max = *blue_max = 0;
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97 break;
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98 case XA_RGB_BLUE_MAP:
2032348afed1 This code adds support for DirectColor visuals to SDL 1.3. The support uses part of the Xmu library. To ensure that the library is
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99 *blue_max = vinfo->colormap_size - 1;
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100 *red_max = *green_max = 0;
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101 break;
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102 default:
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103 status = 0;
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104 }
2032348afed1 This code adds support for DirectColor visuals to SDL 1.3. The support uses part of the Xmu library. To ensure that the library is
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105 return status;
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106 }
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107
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108 /****************************************************************************/
2032348afed1 This code adds support for DirectColor visuals to SDL 1.3. The support uses part of the Xmu library. To ensure that the library is
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109 /* Determine the appropriate color allocations of a gray scale.
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110 *
2032348afed1 This code adds support for DirectColor visuals to SDL 1.3. The support uses part of the Xmu library. To ensure that the library is
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parents:
diff changeset
111 * Keith Packard, MIT X Consortium
2032348afed1 This code adds support for DirectColor visuals to SDL 1.3. The support uses part of the Xmu library. To ensure that the library is
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112 */
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113
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114 static void
2032348afed1 This code adds support for DirectColor visuals to SDL 1.3. The support uses part of the Xmu library. To ensure that the library is
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115 gray_allocation(int n, unsigned long *red_max, unsigned long *green_max,
2032348afed1 This code adds support for DirectColor visuals to SDL 1.3. The support uses part of the Xmu library. To ensure that the library is
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116 unsigned long *blue_max)
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117 {
2032348afed1 This code adds support for DirectColor visuals to SDL 1.3. The support uses part of the Xmu library. To ensure that the library is
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118 *red_max = (n * 30) / 100;
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119 *green_max = (n * 59) / 100;
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120 *blue_max = (n * 11) / 100;
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121 *green_max += ((n - 1) - (*red_max + *green_max + *blue_max));
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122 }
2032348afed1 This code adds support for DirectColor visuals to SDL 1.3. The support uses part of the Xmu library. To ensure that the library is
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123
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124 /****************************************************************************/
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125 /* Determine an appropriate color allocation for the RGB_DEFAULT_MAP.
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126 * If a map has less than a minimum number of definable entries, we do not
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127 * produce an allocation for an RGB_DEFAULT_MAP.
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128 *
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129 * For 16 planes, the default colormap will have 27 each RGB; for 12 planes,
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130 * 12 each. For 8 planes, let n = the number of colormap entries, which may
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131 * be 256 or 254. Then, maximum red value = floor(cube_root(n - 125)) - 1.
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132 * Maximum green and maximum blue values are identical to maximum red.
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133 * This leaves at least 125 cells which clients can allocate.
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134 *
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135 * Return 0 if an allocation has been determined, non-zero otherwise.
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136 */
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137
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138 static int
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139 default_allocation(XVisualInfo * vinfo, unsigned long *red,
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140 unsigned long *green, unsigned long *blue)
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141 {
2032348afed1 This code adds support for DirectColor visuals to SDL 1.3. The support uses part of the Xmu library. To ensure that the library is
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142 int ngrays; /* number of gray cells */
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143
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144 switch (vinfo->class) {
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145 case PseudoColor:
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146
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147 if (vinfo->colormap_size > 65000)
2032348afed1 This code adds support for DirectColor visuals to SDL 1.3. The support uses part of the Xmu library. To ensure that the library is
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148 /* intended for displays with 16 planes */
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149 *red = *green = *blue = (unsigned long) 27;
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150 else if (vinfo->colormap_size > 4000)
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151 /* intended for displays with 12 planes */
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152 *red = *green = *blue = (unsigned long) 12;
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153 else if (vinfo->colormap_size < 250)
2032348afed1 This code adds support for DirectColor visuals to SDL 1.3. The support uses part of the Xmu library. To ensure that the library is
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154 return 0;
2032348afed1 This code adds support for DirectColor visuals to SDL 1.3. The support uses part of the Xmu library. To ensure that the library is
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155 else
2032348afed1 This code adds support for DirectColor visuals to SDL 1.3. The support uses part of the Xmu library. To ensure that the library is
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156 /* intended for displays with 8 planes */
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157 *red = *green = *blue = (unsigned long)
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158 (icbrt(vinfo->colormap_size - 125) - 1);
2032348afed1 This code adds support for DirectColor visuals to SDL 1.3. The support uses part of the Xmu library. To ensure that the library is
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159 break;
2032348afed1 This code adds support for DirectColor visuals to SDL 1.3. The support uses part of the Xmu library. To ensure that the library is
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160
2032348afed1 This code adds support for DirectColor visuals to SDL 1.3. The support uses part of the Xmu library. To ensure that the library is
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161 case DirectColor:
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162
2032348afed1 This code adds support for DirectColor visuals to SDL 1.3. The support uses part of the Xmu library. To ensure that the library is
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163 if (vinfo->colormap_size < 10)
2032348afed1 This code adds support for DirectColor visuals to SDL 1.3. The support uses part of the Xmu library. To ensure that the library is
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164 return 0;
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165 *red = *green = *blue = vinfo->colormap_size / 2 - 1;
2032348afed1 This code adds support for DirectColor visuals to SDL 1.3. The support uses part of the Xmu library. To ensure that the library is
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166 break;
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167
2032348afed1 This code adds support for DirectColor visuals to SDL 1.3. The support uses part of the Xmu library. To ensure that the library is
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168 case TrueColor:
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169
2032348afed1 This code adds support for DirectColor visuals to SDL 1.3. The support uses part of the Xmu library. To ensure that the library is
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170 *red = vinfo->red_mask / lowbit(vinfo->red_mask);
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171 *green = vinfo->green_mask / lowbit(vinfo->green_mask);
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172 *blue = vinfo->blue_mask / lowbit(vinfo->blue_mask);
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173 break;
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174
2032348afed1 This code adds support for DirectColor visuals to SDL 1.3. The support uses part of the Xmu library. To ensure that the library is
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175 case GrayScale:
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176
2032348afed1 This code adds support for DirectColor visuals to SDL 1.3. The support uses part of the Xmu library. To ensure that the library is
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177 if (vinfo->colormap_size > 65000)
2032348afed1 This code adds support for DirectColor visuals to SDL 1.3. The support uses part of the Xmu library. To ensure that the library is
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178 ngrays = 4096;
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179 else if (vinfo->colormap_size > 4000)
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180 ngrays = 512;
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181 else if (vinfo->colormap_size < 250)
2032348afed1 This code adds support for DirectColor visuals to SDL 1.3. The support uses part of the Xmu library. To ensure that the library is
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diff changeset
182 return 0;
2032348afed1 This code adds support for DirectColor visuals to SDL 1.3. The support uses part of the Xmu library. To ensure that the library is
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183 else
2032348afed1 This code adds support for DirectColor visuals to SDL 1.3. The support uses part of the Xmu library. To ensure that the library is
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184 ngrays = 12;
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185 gray_allocation(ngrays, red, green, blue);
2032348afed1 This code adds support for DirectColor visuals to SDL 1.3. The support uses part of the Xmu library. To ensure that the library is
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diff changeset
186 break;
2032348afed1 This code adds support for DirectColor visuals to SDL 1.3. The support uses part of the Xmu library. To ensure that the library is
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diff changeset
187
2032348afed1 This code adds support for DirectColor visuals to SDL 1.3. The support uses part of the Xmu library. To ensure that the library is
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188 default:
2032348afed1 This code adds support for DirectColor visuals to SDL 1.3. The support uses part of the Xmu library. To ensure that the library is
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189 return 0;
2032348afed1 This code adds support for DirectColor visuals to SDL 1.3. The support uses part of the Xmu library. To ensure that the library is
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190 }
2032348afed1 This code adds support for DirectColor visuals to SDL 1.3. The support uses part of the Xmu library. To ensure that the library is
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191 return 1;
2032348afed1 This code adds support for DirectColor visuals to SDL 1.3. The support uses part of the Xmu library. To ensure that the library is
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192 }
2032348afed1 This code adds support for DirectColor visuals to SDL 1.3. The support uses part of the Xmu library. To ensure that the library is
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193
2032348afed1 This code adds support for DirectColor visuals to SDL 1.3. The support uses part of the Xmu library. To ensure that the library is
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194 /****************************************************************************/
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195 /* Determine an appropriate color allocation for the RGB_BEST_MAP.
2032348afed1 This code adds support for DirectColor visuals to SDL 1.3. The support uses part of the Xmu library. To ensure that the library is
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196 *
2032348afed1 This code adds support for DirectColor visuals to SDL 1.3. The support uses part of the Xmu library. To ensure that the library is
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197 * For a DirectColor or TrueColor visual, the allocation is determined
2032348afed1 This code adds support for DirectColor visuals to SDL 1.3. The support uses part of the Xmu library. To ensure that the library is
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198 * by the red_mask, green_mask, and blue_mask members of the visual info.
2032348afed1 This code adds support for DirectColor visuals to SDL 1.3. The support uses part of the Xmu library. To ensure that the library is
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199 *
2032348afed1 This code adds support for DirectColor visuals to SDL 1.3. The support uses part of the Xmu library. To ensure that the library is
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diff changeset
200 * Otherwise, if the colormap size is an integral power of 2, determine
2032348afed1 This code adds support for DirectColor visuals to SDL 1.3. The support uses part of the Xmu library. To ensure that the library is
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diff changeset
201 * the allocation according to the number of bits given to each color,
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diff changeset
202 * with green getting more than red, and red more than blue, if there
2032348afed1 This code adds support for DirectColor visuals to SDL 1.3. The support uses part of the Xmu library. To ensure that the library is
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diff changeset
203 * are to be inequities in the distribution. If the colormap size is
2032348afed1 This code adds support for DirectColor visuals to SDL 1.3. The support uses part of the Xmu library. To ensure that the library is
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diff changeset
204 * not an integral power of 2, let n = the number of colormap entries.
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205 * Then maximum red value = floor(cube_root(n)) - 1;
2032348afed1 This code adds support for DirectColor visuals to SDL 1.3. The support uses part of the Xmu library. To ensure that the library is
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206 * maximum blue value = floor(cube_root(n)) - 1;
2032348afed1 This code adds support for DirectColor visuals to SDL 1.3. The support uses part of the Xmu library. To ensure that the library is
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diff changeset
207 * maximum green value = n / ((# red values) * (# blue values)) - 1;
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208 * Which, on a GPX, allows for 252 entries in the best map, out of 254
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209 * defineable colormap entries.
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210 */
2032348afed1 This code adds support for DirectColor visuals to SDL 1.3. The support uses part of the Xmu library. To ensure that the library is
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diff changeset
211
2032348afed1 This code adds support for DirectColor visuals to SDL 1.3. The support uses part of the Xmu library. To ensure that the library is
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diff changeset
212 static void
2032348afed1 This code adds support for DirectColor visuals to SDL 1.3. The support uses part of the Xmu library. To ensure that the library is
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diff changeset
213 best_allocation(XVisualInfo * vinfo, unsigned long *red, unsigned long *green,
2032348afed1 This code adds support for DirectColor visuals to SDL 1.3. The support uses part of the Xmu library. To ensure that the library is
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diff changeset
214 unsigned long *blue)
2032348afed1 This code adds support for DirectColor visuals to SDL 1.3. The support uses part of the Xmu library. To ensure that the library is
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diff changeset
215 {
2032348afed1 This code adds support for DirectColor visuals to SDL 1.3. The support uses part of the Xmu library. To ensure that the library is
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diff changeset
216
2032348afed1 This code adds support for DirectColor visuals to SDL 1.3. The support uses part of the Xmu library. To ensure that the library is
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parents:
diff changeset
217 if (vinfo->class == DirectColor || vinfo->class == TrueColor) {
2032348afed1 This code adds support for DirectColor visuals to SDL 1.3. The support uses part of the Xmu library. To ensure that the library is
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diff changeset
218 *red = vinfo->red_mask;
2032348afed1 This code adds support for DirectColor visuals to SDL 1.3. The support uses part of the Xmu library. To ensure that the library is
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parents:
diff changeset
219 while ((*red & 01) == 0)
2032348afed1 This code adds support for DirectColor visuals to SDL 1.3. The support uses part of the Xmu library. To ensure that the library is
Bob Pendleton <bob@pendleton.com>
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diff changeset
220 *red >>= 1;
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221 *green = vinfo->green_mask;
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222 while ((*green & 01) == 0)
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223 *green >>= 1;
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224 *blue = vinfo->blue_mask;
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225 while ((*blue & 01) == 0)
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226 *blue >>= 1;
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227 } else {
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228 register int bits, n;
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229
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230 /* Determine n such that n is the least integral power of 2 which is
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231 * greater than or equal to the number of entries in the colormap.
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232 */
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233 n = 1;
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234 bits = 0;
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235 while (vinfo->colormap_size > n) {
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236 n = n << 1;
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237 bits++;
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238 }
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239
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240 /* If the number of entries in the colormap is a power of 2, determine
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241 * the allocation by "dealing" the bits, first to green, then red, then
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242 * blue. If not, find the maximum integral red, green, and blue values
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243 * which, when multiplied together, do not exceed the number of
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244
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245 * colormap entries.
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246 */
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247 if (n == vinfo->colormap_size) {
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248 register int r, g, b;
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249 b = bits / 3;
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250 g = b + ((bits % 3) ? 1 : 0);
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251 r = b + (((bits % 3) == 2) ? 1 : 0);
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252 *red = 1 << r;
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253 *green = 1 << g;
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254 *blue = 1 << b;
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255 } else {
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256 *red = icbrt_with_bits(vinfo->colormap_size, bits);
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257 *blue = *red;
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258 *green = (vinfo->colormap_size / ((*red) * (*blue)));
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259 }
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260 (*red)--;
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261 (*green)--;
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262 (*blue)--;
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263 }
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264 return;
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265 }
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266
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267 /*
2032348afed1 This code adds support for DirectColor visuals to SDL 1.3. The support uses part of the Xmu library. To ensure that the library is
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268 * integer cube roots by Newton's method
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269 *
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270 * Stephen Gildea, MIT X Consortium, July 1991
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271 */
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272
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273 static int
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274 icbrt(int a)
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275 {
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276 register int bits = 0;
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277 register unsigned n = a;
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278
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279 while (n) {
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280 bits++;
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281 n >>= 1;
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282 }
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283 return icbrt_with_bits(a, bits);
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284 }
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285
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286
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287 static int
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288 icbrt_with_bits(int a, int bits)
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289 /* bits - log 2 of a */
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290 {
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291 return icbrt_with_guess(a, a >> 2 * bits / 3);
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292 }
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293
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294 #ifdef _X_ROOT_STATS
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295 int icbrt_loopcount;
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296 #endif
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297
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298 /* Newton's Method: x_n+1 = x_n - ( f(x_n) / f'(x_n) ) */
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299
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300 /* for cube roots, x^3 - a = 0, x_new = x - 1/3 (x - a/x^2) */
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301
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302 /*
2032348afed1 This code adds support for DirectColor visuals to SDL 1.3. The support uses part of the Xmu library. To ensure that the library is
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diff changeset
303 * Quick and dirty cube roots. Nothing fancy here, just Newton's method.
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304 * Only works for positive integers (since that's all we need).
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305 * We actually return floor(cbrt(a)) because that's what we need here, too.
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306 */
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307
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308 static int
2032348afed1 This code adds support for DirectColor visuals to SDL 1.3. The support uses part of the Xmu library. To ensure that the library is
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309 icbrt_with_guess(int a, int guess)
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310 {
2032348afed1 This code adds support for DirectColor visuals to SDL 1.3. The support uses part of the Xmu library. To ensure that the library is
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311 register int delta;
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312
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313 #ifdef _X_ROOT_STATS
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314 icbrt_loopcount = 0;
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315 #endif
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316 if (a <= 0)
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317 return 0;
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318 if (guess < 1)
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319 guess = 1;
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320
2032348afed1 This code adds support for DirectColor visuals to SDL 1.3. The support uses part of the Xmu library. To ensure that the library is
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321 do {
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322 #ifdef _X_ROOT_STATS
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323 icbrt_loopcount++;
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diff changeset
324 #endif
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325 delta = (guess - a / (guess * guess)) / 3;
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326 #ifdef DEBUG
2032348afed1 This code adds support for DirectColor visuals to SDL 1.3. The support uses part of the Xmu library. To ensure that the library is
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diff changeset
327 printf("pass %d: guess=%d, delta=%d\n", icbrt_loopcount, guess,
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328 delta);
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diff changeset
329 #endif
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330 guess -= delta;
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diff changeset
331 } while (delta != 0);
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332
2032348afed1 This code adds support for DirectColor visuals to SDL 1.3. The support uses part of the Xmu library. To ensure that the library is
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diff changeset
333 if (guess * guess * guess > a)
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diff changeset
334 guess--;
2032348afed1 This code adds support for DirectColor visuals to SDL 1.3. The support uses part of the Xmu library. To ensure that the library is
Bob Pendleton <bob@pendleton.com>
parents:
diff changeset
335
2032348afed1 This code adds support for DirectColor visuals to SDL 1.3. The support uses part of the Xmu library. To ensure that the library is
Bob Pendleton <bob@pendleton.com>
parents:
diff changeset
336 return guess;
2032348afed1 This code adds support for DirectColor visuals to SDL 1.3. The support uses part of the Xmu library. To ensure that the library is
Bob Pendleton <bob@pendleton.com>
parents:
diff changeset
337 }