Mercurial > sdl-ios-xcode
annotate src/video/Xext/XmuStdCmap/Distinct.c @ 5134:7b7da52e8775
Fixed spacing
author | Sam Lantinga <slouken@libsdl.org> |
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date | Tue, 01 Feb 2011 08:59:22 -0800 |
parents | 2032348afed1 |
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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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1 /* $Xorg: Distinct.c,v 1.4 2001/02/09 02:03:52 xorgcvs Exp $ */ |
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2 |
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3 /* |
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4 |
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5 Copyright 1990, 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/Distinct.c,v 3.5 2001/07/25 15:04:50 dawes Exp $ */ |
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29 |
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30 /* |
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31 * Author: Keith Packard, 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 <X11/Xlib.h> |
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38 #include <stdlib.h> |
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39 #include <X11/Xutil.h> |
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40 #include "../extensions/StdCmap.h" |
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41 |
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42 /* |
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43 * Distinguishable colors routine. Determines if two colors are |
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44 * distinguishable or not. Somewhat arbitrary meaning. |
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45 */ |
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46 |
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47 #define MIN_DISTINGUISH 10000.0 |
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48 |
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49 Bool |
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50 XmuDistinguishableColors(XColor * colors, int count) |
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51 { |
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52 double deltaRed, deltaGreen, deltaBlue; |
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53 double dist; |
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54 int i, j; |
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55 |
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56 for (i = 0; i < count - 1; i++) |
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57 for (j = i + 1; j < count; j++) { |
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58 deltaRed = (double) colors[i].red - (double) colors[j].red; |
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59 deltaGreen = (double) colors[i].green - (double) colors[j].green; |
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60 deltaBlue = (double) colors[i].blue - (double) colors[j].blue; |
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61 dist = deltaRed * deltaRed + |
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62 deltaGreen * deltaGreen + deltaBlue * deltaBlue; |
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63 if (dist <= MIN_DISTINGUISH * MIN_DISTINGUISH) |
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64 return False; |
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65 } |
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66 return True; |
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67 } |
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68 |
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69 Bool |
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70 XmuDistinguishablePixels(Display * dpy, Colormap cmap, |
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71 unsigned long *pixels, int count) |
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72 { |
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73 XColor *defs; |
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74 int i, j; |
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75 Bool ret; |
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76 |
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77 for (i = 0; i < count - 1; i++) |
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78 for (j = i + 1; j < count; j++) |
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79 if (pixels[i] == pixels[j]) |
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80 return False; |
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81 defs = (XColor *) malloc(count * sizeof(XColor)); |
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82 if (!defs) |
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83 return False; |
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84 for (i = 0; i < count; i++) |
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85 defs[i].pixel = pixels[i]; |
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86 XQueryColors(dpy, cmap, defs, count); |
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87 ret = XmuDistinguishableColors(defs, count); |
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88 free((char *) defs); |
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89 return ret; |
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90 } |