Mercurial > sdl-ios-xcode
annotate src/video/Xext/XmuStdCmap/StdCmap.c @ 3473:7bdc10624cba
This is terrible, but the OpenGL standard says that lines are half open, which means that one endpoint is not covered so adjoining lines don't overlap. It also doesn't define which end is open, and indeed Mac OS X and Linux differ. Mac OS X seems to leave the second endpoint open, but Linux uses the right-most endpoint for x major lines and the bottom-most endpoint for y major lines.
author | Sam Lantinga <slouken@libsdl.org> |
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date | Sat, 21 Nov 2009 07:14:21 +0000 |
parents | 2032348afed1 |
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1 /* $Xorg: StdCmap.c,v 1.4 2001/02/09 02:03:53 xorgcvs Exp $ */ |
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2 |
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3 /* |
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4 |
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5 Copyright 1989, 1998 The Open Group |
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6 |
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7 Permission to use, copy, modify, distribute, and sell this software and its |
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8 documentation for any purpose is hereby granted without fee, provided that |
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9 the above copyright notice appear in all copies and that both that |
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10 copyright notice and this permission notice appear in supporting |
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11 documentation. |
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12 |
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13 The above copyright notice and this permission notice shall be included in |
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14 all copies or substantial portions of the Software. |
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15 |
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16 THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR |
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17 IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, |
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18 FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE |
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19 OPEN GROUP BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN |
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20 AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN |
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21 CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. |
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22 |
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23 Except as contained in this notice, the name of The Open Group shall not be |
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24 used in advertising or otherwise to promote the sale, use or other dealings |
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25 in this Software without prior written authorization from The Open Group. |
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26 |
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27 */ |
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28 /* $XFree86: xc/lib/Xmu/StdCmap.c,v 1.5 2001/01/17 19:42:56 dawes Exp $ */ |
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29 |
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30 /* |
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31 * Author: Donna Converse, MIT X Consortium |
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32 */ |
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33 |
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34 #ifdef HAVE_CONFIG_H |
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35 #include <config.h> |
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36 #endif |
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37 #include <stdio.h> |
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38 #include <X11/Xlib.h> |
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39 #include <X11/Xatom.h> |
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40 #include <X11/Xutil.h> |
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41 #include "../extensions/StdCmap.h" |
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42 |
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43 #define lowbit(x) ((x) & (~(x) + 1)) |
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44 |
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45 /* |
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46 * Prototypes |
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47 */ |
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48 /* argument restrictions */ |
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49 static Status valid_args(XVisualInfo *, unsigned long, unsigned long, |
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50 unsigned long, Atom); |
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51 |
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52 /* |
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53 * To create any one standard colormap, use XmuStandardColormap(). |
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54 * |
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55 * Create a standard colormap for the given screen, visualid, and visual |
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56 * depth, with the given red, green, and blue maximum values, with the |
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57 * given standard property name. Return a pointer to an XStandardColormap |
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58 * structure which describes the newly created colormap, upon success. |
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59 * Upon failure, return NULL. |
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60 * |
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61 * XmuStandardColormap() calls XmuCreateColormap() to create the map. |
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62 * |
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63 * Resources created by this function are not made permanent; that is the |
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64 * caller's responsibility. |
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65 */ |
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66 |
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67 XStandardColormap * |
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68 XmuStandardColormap(Display * dpy, int screen, VisualID visualid, |
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69 unsigned int depth, Atom property, Colormap cmap, |
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70 unsigned long red_max, unsigned long green_max, |
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71 unsigned long blue_max) |
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72 /* |
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73 * dpy - specifies X server connection |
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74 * screen - specifies display screen |
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75 * visualid - identifies the visual type |
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76 * depth - identifies the visual type |
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77 * property - a standard colormap property |
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78 * cmap - specifies colormap ID or None |
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79 * red_max, green_max, blue_max - allocations |
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80 */ |
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81 { |
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82 XStandardColormap *stdcmap; |
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83 Status status; |
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84 XVisualInfo vinfo_template, *vinfo; |
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85 long vinfo_mask; |
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86 int n; |
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87 |
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88 /* Match the required visual information to an actual visual */ |
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89 vinfo_template.visualid = visualid; |
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90 vinfo_template.screen = screen; |
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91 vinfo_template.depth = depth; |
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92 vinfo_mask = VisualIDMask | VisualScreenMask | VisualDepthMask; |
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93 if ((vinfo = |
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94 XGetVisualInfo(dpy, vinfo_mask, &vinfo_template, &n)) == NULL) |
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95 return 0; |
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96 |
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97 /* Check the validity of the combination of visual characteristics, |
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98 * allocation, and colormap property. Create an XStandardColormap |
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99 * structure. |
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100 */ |
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101 |
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102 if (!valid_args(vinfo, red_max, green_max, blue_max, property) |
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103 || ((stdcmap = XAllocStandardColormap()) == NULL)) { |
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104 XFree((char *) vinfo); |
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105 return 0; |
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106 } |
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107 |
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108 /* Fill in the XStandardColormap structure */ |
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109 |
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110 if (cmap == DefaultColormap(dpy, screen)) { |
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111 /* Allocating out of the default map, cannot use XFreeColormap() */ |
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112 Window win = XCreateWindow(dpy, RootWindow(dpy, screen), 1, 1, 1, 1, |
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113 0, 0, InputOnly, vinfo->visual, |
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114 (unsigned long) 0, |
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115 (XSetWindowAttributes *) NULL); |
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116 stdcmap->killid = (XID) XCreatePixmap(dpy, win, 1, 1, depth); |
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117 XDestroyWindow(dpy, win); |
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118 stdcmap->colormap = cmap; |
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119 } else { |
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120 stdcmap->killid = ReleaseByFreeingColormap; |
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121 stdcmap->colormap = XCreateColormap(dpy, RootWindow(dpy, screen), |
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122 vinfo->visual, AllocNone); |
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123 } |
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124 stdcmap->red_max = red_max; |
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125 stdcmap->green_max = green_max; |
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126 stdcmap->blue_max = blue_max; |
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127 if (property == XA_RGB_GRAY_MAP) |
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128 stdcmap->red_mult = stdcmap->green_mult = stdcmap->blue_mult = 1; |
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129 else if (vinfo->class == TrueColor || vinfo->class == DirectColor) { |
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130 stdcmap->red_mult = lowbit(vinfo->red_mask); |
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131 stdcmap->green_mult = lowbit(vinfo->green_mask); |
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132 stdcmap->blue_mult = lowbit(vinfo->blue_mask); |
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133 } else { |
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134 stdcmap->red_mult = (red_max > 0) |
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135 ? (green_max + 1) * (blue_max + 1) : 0; |
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136 stdcmap->green_mult = (green_max > 0) ? blue_max + 1 : 0; |
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137 stdcmap->blue_mult = (blue_max > 0) ? 1 : 0; |
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138 } |
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139 stdcmap->base_pixel = 0; /* base pixel may change */ |
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140 stdcmap->visualid = vinfo->visualid; |
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141 |
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142 /* Make the colormap */ |
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143 |
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144 status = XmuCreateColormap(dpy, stdcmap); |
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145 |
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146 /* Clean up */ |
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147 |
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148 XFree((char *) vinfo); |
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149 if (!status) { |
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150 |
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151 /* Free the colormap or the pixmap, if we created one */ |
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152 if (stdcmap->killid == ReleaseByFreeingColormap) |
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153 XFreeColormap(dpy, stdcmap->colormap); |
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154 else if (stdcmap->killid != None) |
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155 XFreePixmap(dpy, stdcmap->killid); |
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156 |
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157 XFree((char *) stdcmap); |
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158 return (XStandardColormap *) NULL; |
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159 } |
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160 return stdcmap; |
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161 } |
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162 |
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163 /****************************************************************************/ |
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164 static Status |
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165 valid_args(XVisualInfo * vinfo, unsigned long red_max, |
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166 unsigned long green_max, unsigned long blue_max, Atom property) |
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167 /* |
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168 * vinfo - specifies visual |
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169 * red_max, green_max, blue_max - specifies alloc |
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170 * property - specifies property name |
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171 */ |
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172 { |
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173 unsigned long ncolors; /* number of colors requested */ |
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174 |
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175 /* Determine that the number of colors requested is <= map size */ |
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176 |
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177 if ((vinfo->class == DirectColor) || (vinfo->class == TrueColor)) { |
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178 unsigned long mask; |
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179 |
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180 mask = vinfo->red_mask; |
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181 while (!(mask & 1)) |
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182 mask >>= 1; |
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183 if (red_max > mask) |
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184 return 0; |
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185 mask = vinfo->green_mask; |
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186 while (!(mask & 1)) |
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187 mask >>= 1; |
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188 if (green_max > mask) |
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189 return 0; |
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190 mask = vinfo->blue_mask; |
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191 while (!(mask & 1)) |
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192 mask >>= 1; |
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193 if (blue_max > mask) |
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194 return 0; |
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195 } else if (property == XA_RGB_GRAY_MAP) { |
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196 ncolors = red_max + green_max + blue_max + 1; |
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197 if (ncolors > vinfo->colormap_size) |
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198 return 0; |
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199 } else { |
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200 ncolors = (red_max + 1) * (green_max + 1) * (blue_max + 1); |
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201 if (ncolors > vinfo->colormap_size) |
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202 return 0; |
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203 } |
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204 |
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205 /* Determine that the allocation and visual make sense for the property */ |
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206 |
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207 switch (property) { |
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208 case XA_RGB_DEFAULT_MAP: |
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209 if (red_max == 0 || green_max == 0 || blue_max == 0) |
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210 return 0; |
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211 break; |
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212 case XA_RGB_RED_MAP: |
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213 if (red_max == 0) |
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214 return 0; |
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215 break; |
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216 case XA_RGB_GREEN_MAP: |
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217 if (green_max == 0) |
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218 return 0; |
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219 break; |
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220 case XA_RGB_BLUE_MAP: |
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221 if (blue_max == 0) |
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222 return 0; |
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223 break; |
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224 case XA_RGB_BEST_MAP: |
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225 if (red_max == 0 || green_max == 0 || blue_max == 0) |
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226 return 0; |
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227 break; |
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228 case XA_RGB_GRAY_MAP: |
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229 if (red_max == 0 || blue_max == 0 || green_max == 0) |
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230 return 0; |
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231 break; |
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232 default: |
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233 return 0; |
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234 } |
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235 return 1; |
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236 } |