annotate src/video/riscos/SDL_riscostask.c @ 1643:51038e80ae59

More general fix for bug #189 The clipping is done at a higher level, and the low level functions are passed clipped rectangles. Drivers which don't support source clipping have not been changed, so the image will be squished instead of clipped, but at least they will no longer crash when the destination rect was out of bounds.
author Sam Lantinga <slouken@libsdl.org>
date Mon, 17 Apr 2006 06:47:23 +0000
parents d910939febfa
children 782fd950bd46 c121d94672cb a1b03ba2fcd0
rev   line source
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1 /*
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2 SDL - Simple DirectMedia Layer
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3 Copyright (C) 1997-2004 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 Library General Public
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7 License as published by the Free Software Foundation; either
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8 version 2 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 Library 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 Library General Public
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16 License along with this library; if not, write to the Free
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17 Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 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 /*
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25 This file added by Alan Buckley (alan_baa@hotmail.com) to support RISC OS
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26 26 March 2003
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27
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28 File includes routines for:
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29 Setting up as a WIMP Task
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30 Reading information about the current desktop
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31 Storing information before a switch to full screen
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32 Restoring desktop after switching to full screen
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33 */
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34
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35 #include "kernel.h"
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36 #include "swis.h"
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37
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38 #include "SDL_stdinc.h"
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39 #include "SDL_riscostask.h"
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40
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41 #if !SDL_THREADS_DISABLED
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42 #include <pthread.h>
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43 pthread_t main_thread;
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44 #endif
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45
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46 /* RISC OS variables */
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47
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48 static int task_handle = 0;
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49 static int wimp_version = 0;
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50
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51 /* RISC OS variables to help compatability with certain programs */
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52 int riscos_backbuffer = 0; /* Create a back buffer in system memory for full screen mode */
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53 int riscos_closeaction = 1; /* Close icon action */
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54
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55 static int stored_mode = -1; /* -1 when in desktop, mode number or pointer when full screen */
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56
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57 extern int mouseInWindow; /* Mouse is in WIMP window */
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58
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59 /* Local function */
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60
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61 static int RISCOS_GetTaskName(char *task_name, size_t maxlen);
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62
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63 /* Uncomment next line to copy mode changes/restores to stderr */
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64 /* #define DUMP_MODE */
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65 #ifdef DUMP_MODE
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66 #include "stdio.h"
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67 static void dump_mode()
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68 {
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69 fprintf(stderr, "mode %d\n", stored_mode);
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70 if (stored_mode < -1 || stored_mode >= 256)
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71 {
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72 int blockSize = 0;
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73 int *storeBlock = (int *)stored_mode;
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74
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75 while(blockSize < 5 || storeBlock[blockSize] != -1)
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76 {
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77 fprintf(stderr, " %d\n", storeBlock[blockSize++]);
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78 }
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79 }
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80 }
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81 #endif
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82
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83 /******************************************************************
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84
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85 Initialise as RISC OS Wimp task
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86
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87 *******************************************************************/
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88
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89 int RISCOS_InitTask()
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90 {
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91 char task_name[32];
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92 _kernel_swi_regs regs;
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93 int messages[4];
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94
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95 if (RISCOS_GetTaskName(task_name, SDL_arraysize(task_name)) == 0) return 0;
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96
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97 messages[0] = 9; /* Palette changed */
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98 messages[1] = 0x400c1; /* Mode changed */
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99 messages[2] = 8; /* Pre quit */
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100 messages[2] = 0;
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101
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102 regs.r[0] = (unsigned int)360; /* Minimum version 3.6 */
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103 regs.r[1] = (unsigned int)0x4b534154;
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104 regs.r[2] = (unsigned int)task_name;
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105 regs.r[3] = (unsigned int)messages;
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106
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107 if (_kernel_swi(Wimp_Initialise, &regs, &regs) == 0)
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108 {
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109 wimp_version = regs.r[0];
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110 task_handle = regs.r[1];
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111 return 1;
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112 }
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113
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114 #if !SDL_THREADS_DISABLED
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115 main_thread = pthread_self();
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116 #endif
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117
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118 return 0;
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119 }
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120
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121 /*********************************************************************
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122
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123 Close down application on exit.
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124
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125 **********************************************************************/
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126
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127 void RISCOS_ExitTask()
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128 {
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129 _kernel_swi_regs regs;
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130
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131 if (stored_mode == -1)
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132 {
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133 /* Ensure cursor is put back to standard pointer shape if
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134 we have been running in a window */
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135 _kernel_osbyte(106,1,0);
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136 }
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137
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138 /* Ensure we end up back in the wimp */
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139 RISCOS_RestoreWimpMode();
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140
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141 /* Neatly exit the task */
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142 regs.r[0] = task_handle;
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143 regs.r[1] = (unsigned int)0x4b534154;
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144 _kernel_swi(Wimp_CloseDown, &regs, &regs);
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145 task_handle = 0;
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146 }
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147
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148 /**************************************************************************
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149
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150 Get the name of the task for the desktop.
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151
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152 Param: task_name - name of task 32 characters.
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153
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154 Returns: 1 is successful, otherwise 0
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155
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156 Notes: Works by getting using OS_GetEnv to get the command line
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157 used to run the program and then parsing a name from it
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158 as follows.
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159
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160 1. Use name after final period if not !RunImage
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161 2. If name is !RunImage then process item before the period
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162 in front of !RunImage.
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163 3. If directory name use that
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164 4. if in form <XXX$Dir> use the XXX.
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165
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166 Finally once this value has been retrieved use it unless
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167 there is a variable set up in the form SDL$<name>$TaskName
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168 in which case the value of this variable will be used.
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169
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170 Now also gets other RISC OS configuration varibles
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171 SDL$<name>$BackBuffer - set to 1 to use a system memory backbuffer in fullscreen mode
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172 so updates wait until a call to SDL_UpdateRects. (default 0)
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173 This is required for programmes where they have assumed this is
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174 always the case which is contrary to the documentation.
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175 SDL$<name>$CloseAction
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176 0 Don't show close icon
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177 1 Show close icon
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178
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179 ***************************************************************************/
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180
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181 int RISCOS_GetTaskName(char *task_name, size_t maxlen)
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182 {
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183 _kernel_swi_regs regs;
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184
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185 task_name[0] = 0;
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186
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187 /* Figure out a sensible task name */
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188 if (_kernel_swi(OS_GetEnv, &regs, &regs) == 0)
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189 {
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190 char *command_line = (char *)regs.r[0];
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191 size_t len = SDL_strlen(command_line)+1;
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192 char *buffer = SDL_stack_alloc(char, len);
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193 char *env_var;
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194 char *p;
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195
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196 SDL_strlcpy(buffer, command_line, len);
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197 p = SDL_strchr(buffer, ' ');
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198 if (p) *p = 0;
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199 p = SDL_strrchr(buffer, '.');
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200 if (p == 0) p = buffer;
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201 if (stricmp(p+1,"!RunImage") == 0)
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202 {
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203 *p = 0;
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204 p = SDL_strrchr(buffer, '.');
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205 if (p == 0) p = buffer;
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206 }
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207 if (*p == '.') p++;
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208 if (*p == '!') p++; /* Skip "!" at beginning of application directories */
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209
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210 if (*p == '<')
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211 {
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212 // Probably in the form <appname$Dir>
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213 char *q = SDL_strchr(p, '$');
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214 if (q == 0) q = SDL_strchr(p,'>'); /* Use variable name if not */
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215 if (q) *q = 0;
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216 p++; /* Move over the < */
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217 }
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218
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219 if (*p)
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220 {
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221 /* Read variables that effect the RISC OS SDL engine for this task */
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222 len = SDL_strlen(p) + 18; /* 18 is larger than the biggest variable name */
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223 env_var = SDL_stack_alloc(char, len);
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224 if (env_var)
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225 {
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226 char *env_val;
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227
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228 /* See if a variable of form SDL$<dirname>$TaskName exists */
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229
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230 SDL_strlcpy(env_var, "SDL$", len);
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231 SDL_strlcat(env_var, p, len);
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232 SDL_strlcat(env_var, "$TaskName", len);
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233
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234 env_val = SDL_getenv(env_var);
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235 if (env_val) SDL_strlcpy(task_name, env_val, maxlen);
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236
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237 SDL_strlcpy(env_var, "SDL$", len);
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238 SDL_strlcat(env_var, p, len);
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239 SDL_strlcat(env_var, "$BackBuffer", len);
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240
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241 env_val = SDL_getenv(env_var);
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242 if (env_val) riscos_backbuffer = atoi(env_val);
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243
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244 SDL_strlcpy(env_var, "SDL$", len);
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245 SDL_strlcat(env_var, p, len);
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246 SDL_strlcat(env_var, "$CloseAction", len);
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247
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248 env_val = SDL_getenv(env_var);
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249 if (env_val && SDL_strcmp(env_val,"0") == 0) riscos_closeaction = 0;
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250
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251 SDL_stack_free(env_var);
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252 }
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253
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254 if (!*task_name) SDL_strlcpy(task_name, p, maxlen);
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255 }
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256
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257 SDL_stack_free(buffer);
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258 }
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259
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260 if (task_name[0] == 0) SDL_strlcpy(task_name, "SDL Task", maxlen);
630
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261
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262 return 1;
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263 }
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264
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265 /*****************************************************************
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266
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267 Store the current desktop screen mode if we are in the desktop.
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268
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269 ******************************************************************/
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270
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271 void RISCOS_StoreWimpMode()
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272 {
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273 _kernel_swi_regs regs;
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274
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275 /* Don't store if in full screen mode */
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276 if (stored_mode != -1) return;
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277
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278 regs.r[0] = 1;
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279 _kernel_swi(OS_ScreenMode, &regs, &regs);
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280 if (regs.r[1] >= 0 && regs.r[1] < 256) stored_mode = regs.r[1];
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281 else
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282 {
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283 int blockSize = 0;
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284 int *retBlock = (int *)regs.r[1];
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285 int *storeBlock;
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286 int j;
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287
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288 while(blockSize < 5 || retBlock[blockSize] != -1) blockSize++;
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289 blockSize++;
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290 storeBlock = (int *)SDL_malloc(blockSize * sizeof(int));
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291 retBlock = (int *)regs.r[1];
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292 for ( j = 0; j < blockSize; j++)
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293 storeBlock[j] = retBlock[j];
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294
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295 stored_mode = (int)storeBlock;
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296 }
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297 #if DUMP_MODE
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298 fprintf(stderr, "Stored "); dump_mode();
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299 #endif
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300 }
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301
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302 /*****************************************************************
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303
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304 Restore desktop screen mode if we are in full screen mode.
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305
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306 *****************************************************************/
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307
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308 void RISCOS_RestoreWimpMode()
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309 {
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310 _kernel_swi_regs regs;
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311
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312 /* Only need to restore if we are in full screen mode */
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313 if (stored_mode == -1) return;
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314
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315 #if DUMP_MODE
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316 fprintf(stderr, "Restored"); dump_mode();
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317 #endif
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318
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319 regs.r[0] = stored_mode;
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320 _kernel_swi(Wimp_SetMode, &regs, &regs);
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321 if (stored_mode < 0 || stored_mode > 256)
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322 {
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323 SDL_free((int *)stored_mode);
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324 }
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325 stored_mode = -1;
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326
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327 /* Flush keyboard buffer to dump the keystrokes we've already polled */
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328 regs.r[0] = 21;
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329 regs.r[1] = 0; /* Keyboard buffer number */
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330 _kernel_swi(OS_Byte, &regs, &regs);
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331
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332 mouseInWindow = 0;
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333
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334 }
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335
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336 /*********************************************************************
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337
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338 Get version of Wimp running when task was initialised.
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339
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340 *********************************************************************/
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341
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342 int RISCOS_GetWimpVersion()
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343 {
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344 return wimp_version;
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345 }
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346
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347 int RISCOS_GetTaskHandle()
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348 {
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349 return task_handle;
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350 }