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annotate src/SDL_fatal.c @ 4590:1ad70fb49fcb

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Fix so many things that there is little place in this column to list them all but the result is that blending modes just work now for drawing primitives. Fixes involved: 1. Fix handling of alpha channel when SDL_BLENDMODE_NONE is set. 2. Make xrendercolor use floating-point values for color channels and then convert to 16 bit ints. 3. Fix handling of visuals in SDL_x11modes.c so that a 32 bit ARGB visual is used. 4. Fix the background pixel value in SDL_x11window.c so that the window background has an alpha value of 0xFF and not 0.
author Sunny Sachanandani <sunnysachanandani@gmail.com>
date Fri, 09 Jul 2010 21:36:41 +0530
parents f7b03b6838cb
children b530ef003506
rev   line source
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1 /*
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2 SDL - Simple DirectMedia Layer
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3 Copyright (C) 1997-2010 Sam Lantinga
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4
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5 This library is free software; you can redistribute it and/or
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6 modify it under the terms of the GNU Lesser General Public
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7 License as published by the Free Software Foundation; either
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8 version 2.1 of the License, or (at your option) any later version.
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9
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10 This library is distributed in the hope that it will be useful,
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11 but WITHOUT ANY WARRANTY; without even the implied warranty of
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12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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13 Lesser General Public License for more details.
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14
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15 You should have received a copy of the GNU Lesser General Public
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16 License along with this library; if not, write to the Free Software
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17 Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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18
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19 Sam Lantinga
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20 slouken@libsdl.org
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21 */
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22 #include "SDL_config.h"
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23
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24 /* General fatal signal handling code for SDL */
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25
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26 #ifdef HAVE_SIGNAL_H
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27
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28 #include <signal.h>
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29
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30 #include "SDL.h"
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31 #include "SDL_fatal.h"
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32
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33 /* This installs some signal handlers for the more common fatal signals,
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34 so that if the programmer is lazy, the app doesn't die so horribly if
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35 the program crashes.
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36 */
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37
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38 static void
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39 SDL_Parachute(int sig)
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40 {
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41 signal(sig, SIG_DFL);
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42 SDL_Quit();
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43 raise(sig);
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44 }
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45
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46 static const int SDL_fatal_signals[] = {
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47 SIGSEGV,
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48 #ifdef SIGBUS
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49 SIGBUS,
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50 #endif
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51 #ifdef SIGFPE
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52 SIGFPE,
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53 #endif
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54 #ifdef SIGQUIT
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55 SIGQUIT,
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56 #endif
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57 0
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58 };
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59
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60 void
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61 SDL_InstallParachute(void)
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62 {
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63 /* Set a handler for any fatal signal not already handled */
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64 int i;
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65 #ifdef HAVE_SIGACTION
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66 struct sigaction action;
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67
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68 for (i = 0; SDL_fatal_signals[i]; ++i) {
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69 sigaction(SDL_fatal_signals[i], NULL, &action);
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70 if (action.sa_handler == SIG_DFL) {
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71 action.sa_handler = SDL_Parachute;
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72 sigaction(SDL_fatal_signals[i], &action, NULL);
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73 }
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74 }
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75 #ifdef SIGALRM
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76 /* Set SIGALRM to be ignored -- necessary on Solaris */
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77 sigaction(SIGALRM, NULL, &action);
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78 if (action.sa_handler == SIG_DFL) {
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79 action.sa_handler = SIG_IGN;
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80 sigaction(SIGALRM, &action, NULL);
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81 }
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82 #endif
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83 #else
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84 void (*ohandler) (int);
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85
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86 for (i = 0; SDL_fatal_signals[i]; ++i) {
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87 ohandler = signal(SDL_fatal_signals[i], SDL_Parachute);
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88 if (ohandler != SIG_DFL) {
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89 signal(SDL_fatal_signals[i], ohandler);
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90 }
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91 }
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92 #endif /* HAVE_SIGACTION */
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93 return;
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94 }
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95
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96 void
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97 SDL_UninstallParachute(void)
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98 {
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99 /* Remove a handler for any fatal signal handled */
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100 int i;
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101 #ifdef HAVE_SIGACTION
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102 struct sigaction action;
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103
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104 for (i = 0; SDL_fatal_signals[i]; ++i) {
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105 sigaction(SDL_fatal_signals[i], NULL, &action);
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106 if (action.sa_handler == SDL_Parachute) {
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107 action.sa_handler = SIG_DFL;
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108 sigaction(SDL_fatal_signals[i], &action, NULL);
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109 }
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110 }
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111 #else
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112 void (*ohandler) (int);
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113
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114 for (i = 0; SDL_fatal_signals[i]; ++i) {
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115 ohandler = signal(SDL_fatal_signals[i], SIG_DFL);
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116 if (ohandler != SDL_Parachute) {
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117 signal(SDL_fatal_signals[i], ohandler);
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118 }
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119 }
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120 #endif /* HAVE_SIGACTION */
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121 }
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122
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123 #else
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124
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125 /* No signals on this platform, nothing to do.. */
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126
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127 void
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128 SDL_InstallParachute(void)
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129 {
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130 return;
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131 }
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132
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133 void
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134 SDL_UninstallParachute(void)
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135 {
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136 return;
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137 }
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parents: 1312
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138
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parents: 1312
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139 #endif /* HAVE_SIGNAL_H */
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parents: 1402
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140 /* vi: set ts=4 sw=4 expandtab: */