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1 /*
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2 Stereoimg - an OpenGL stereoscopic image viewer.
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3 Copyright (C) 2011 John Tsiombikas <nuclear@member.fsf.org>
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4
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5 This program is free software: you can redistribute it and/or modify
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6 it under the terms of the GNU General Public License as published by
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7 the Free Software Foundation, either version 3 of the License, or
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8 (at your option) any later version.
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9
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10 This program 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
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13 GNU 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 General Public License
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16 along with this program. If not, see <http://www.gnu.org/licenses/>.
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17 */
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18
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19 #include <stdio.h>
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20 #include <stdlib.h>
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21 #include <assert.h>
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22
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23 #ifndef __APPLE__
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24 #include <GL/glut.h>
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25 #else
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26 #include <GLUT/glut.h>
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27 #endif
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28
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29 #include <imago2.h>
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30
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31 struct imgnode {
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32 char *name;
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33 int width, height;
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34 unsigned int tex;
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35 int swap;
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36
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37 struct imgnode *next;
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38 };
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39
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40 void show_image(struct imgnode *node);
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41 void disp(void);
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42 void reshape(int x, int y);
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43 void keyb(unsigned char key, int x, int y);
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44 int parse_args(int argc, char **argv);
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45
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46
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47 struct imgnode *imglist;
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48 int swap_eyes;
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49
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50
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51 int main(int argc, char **argv)
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52 {
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53 glutInit(&argc, argv);
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54 glutInitDisplayMode(GLUT_RGB | GLUT_DOUBLE);// | GLUT_STEREO);
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55 glutInitWindowSize(128, 128);
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56 glutCreateWindow("stereo image viewer");
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57
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58 if(parse_args(argc, argv) == -1) {
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59 return 1;
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60 }
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61
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62 glutDisplayFunc(disp);
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63 glutReshapeFunc(reshape);
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64 glutKeyboardFunc(keyb);
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65 glutIdleFunc(glutPostRedisplay);
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66
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67 glEnable(GL_TEXTURE_2D);
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68 show_image(imglist);
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69
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70 glutMainLoop();
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71 return 0;
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72 }
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73
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74
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75 void show_image(struct imgnode *node)
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76 {
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77 glutReshapeWindow(node->width / 2, node->height);
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78 glutSetWindowTitle(node->name);
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79
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80 glBindTexture(GL_TEXTURE_2D, node->tex);
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81
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82 swap_eyes = node->swap;
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83 }
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84
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85 void disp(void)
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86 {
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87 glDrawBuffer(swap_eyes ? GL_BACK_RIGHT : GL_BACK_LEFT);
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88 glClear(GL_COLOR_BUFFER_BIT);
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89
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90 glBegin(GL_QUADS);
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91 glColor3f(1, 1, 1);
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92 glTexCoord2f(0, 1); glVertex2f(-1, -1);
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93 glTexCoord2f(0.5, 1); glVertex2f(1, -1);
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94 glTexCoord2f(0.5, 0); glVertex2f(1, 1);
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95 glTexCoord2f(0, 0); glVertex2f(-1, 1);
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96 glEnd();
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97
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98 glDrawBuffer(swap_eyes ? GL_BACK_LEFT : GL_BACK_RIGHT);
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99 glClear(GL_COLOR_BUFFER_BIT);
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100
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101 glBegin(GL_QUADS);
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102 glColor3f(1, 1, 1);
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103 glTexCoord2f(0.5, 1); glVertex2f(-1, -1);
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104 glTexCoord2f(1, 1); glVertex2f(1, -1);
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105 glTexCoord2f(1, 0); glVertex2f(1, 1);
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106 glTexCoord2f(0.5, 0); glVertex2f(-1, 1);
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107 glEnd();
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108
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109 glutSwapBuffers();
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110 assert(glGetError() == GL_NO_ERROR);
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111 }
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112
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113 void reshape(int x, int y)
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114 {
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115 glViewport(0, 0, x, y);
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116 }
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117
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118 void keyb(unsigned char key, int x, int y)
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119 {
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120 switch(key) {
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121 case 's':
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122 swap_eyes = !swap_eyes;
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123 glutPostRedisplay();
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124 break;
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125
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126 case ' ':
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127 imglist = imglist->next;
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128 show_image(imglist);
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129 glutPostRedisplay();
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130 break;
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131
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132 case 27:
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133 case 'q':
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134 exit(0);
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135
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136 default:
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137 break;
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138 }
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139 }
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140
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141 int parse_args(int argc, char **argv)
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142 {
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143 int i, cur_swap = 0;
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144 struct imgnode *node;
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145 struct imgnode *head = 0, *tail = 0;
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146
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147 for(i=1; i<argc; i++) {
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148 if(argv[i][0] == '-' && argv[i][2] == 0) {
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149 switch(argv[i][1]) {
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150 case 's':
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151 cur_swap = !cur_swap;
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152 break;
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153
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154 default:
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155 fprintf(stderr, "invalid option: %s\n", argv[i]);
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156 return -1;
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157 }
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158 } else {
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159 int xsz, ysz;
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160 void *pix;
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161 unsigned int tex;
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162
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163 if(!(pix = img_load_pixels(argv[i], &xsz, &ysz, IMG_FMT_RGBA32))) {
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164 fprintf(stderr, "failed to open image: %s\n", argv[i]);
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165 return -1;
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166 }
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167 glGenTextures(1, &tex);
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168 glBindTexture(GL_TEXTURE_2D, tex);
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169 glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
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170 glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
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171 glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP);
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172 glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP);
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173 glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, xsz, ysz, 0, GL_RGBA, GL_UNSIGNED_BYTE, pix);
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174 img_free_pixels(pix);
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175
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176 if(!(node = malloc(sizeof *node))) {
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177 perror("failed to allocate image node");
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178 return -1;
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179 }
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180 node->name = argv[i];
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181 node->width = xsz;
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182 node->height = ysz;
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183 node->tex = tex;
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184 node->swap = cur_swap;
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185 node->next = 0;
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186
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187 if(head) {
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188 tail->next = node;
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189 tail = node;
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190 } else {
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191 head = tail = node;
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192 }
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193 }
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194 }
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195
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196 if(!head) {
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197 fprintf(stderr, "you must specify one or more images to open\n");
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198 return -1;
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199 }
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200 tail->next = head;
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201 imglist = head;
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202 return 0;
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203 }
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