Mercurial > sdl-ios-xcode
annotate test/testbitmap.c @ 2318:0c653886cce7
HandleEvent() returns done each time it is called. If done was set to 0 the program should quit, but because done is not checked until *all* events are handled a
following event can reset done to 1 and prevent the program from terminating when told to. I fixed the while loop that handles events to check for the state of done
after handling each event. That could leave some events unhandled when the program exits, but it ensures that the program will exit.
author | Bob Pendleton <bob@pendleton.com> |
---|---|
date | Wed, 20 Feb 2008 23:27:33 +0000 |
parents | c121d94672cb |
children | 7e449145b6ca f55c87ae336b |
rev | line source |
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0 | 1 |
2 /* Simple program: Test bitmap blits */ | |
3 | |
4 #include <stdio.h> | |
5 #include <stdlib.h> | |
6 #include <string.h> | |
7 | |
8 #include "SDL.h" | |
9 #include "picture.xbm" | |
10 | |
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11 /* Call this instead of exit(), so we can clean up SDL: atexit() is evil. */ |
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12 static void |
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13 quit(int rc) |
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14 { |
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15 SDL_Quit(); |
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16 exit(rc); |
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17 } |
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18 |
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19 SDL_Surface * |
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20 LoadXBM(SDL_Surface * screen, int w, int h, Uint8 * bits) |
0 | 21 { |
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22 SDL_Surface *bitmap; |
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23 Uint8 *line; |
0 | 24 |
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25 /* Allocate the bitmap */ |
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26 bitmap = SDL_CreateRGBSurface(SDL_SWSURFACE, w, h, 1, 0, 0, 0, 0); |
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27 if (bitmap == NULL) { |
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28 fprintf(stderr, "Couldn't allocate bitmap: %s\n", SDL_GetError()); |
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29 return (NULL); |
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30 } |
0 | 31 |
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32 /* Copy the pixels */ |
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33 line = (Uint8 *) bitmap->pixels; |
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34 w = (w + 7) / 8; |
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35 while (h--) { |
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36 memcpy(line, bits, w); |
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37 /* X11 Bitmap images have the bits reversed */ |
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38 { |
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39 int i, j; |
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40 Uint8 *buf, byte; |
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41 for (buf = line, i = 0; i < w; ++i, ++buf) { |
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42 byte = *buf; |
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43 *buf = 0; |
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44 for (j = 7; j >= 0; --j) { |
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45 *buf |= (byte & 0x01) << j; |
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46 byte >>= 1; |
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47 } |
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48 } |
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49 } |
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50 line += bitmap->pitch; |
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51 bits += w; |
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52 } |
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53 return (bitmap); |
0 | 54 } |
55 | |
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56 int |
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57 main(int argc, char *argv[]) |
0 | 58 { |
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59 SDL_Surface *screen; |
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60 SDL_Surface *bitmap; |
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61 Uint8 video_bpp; |
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62 Uint32 videoflags; |
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63 Uint8 *buffer; |
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64 int i, k, done; |
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65 SDL_Event event; |
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66 Uint16 *buffer16; |
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67 Uint16 color; |
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68 Uint8 gradient; |
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69 SDL_Color palette[256]; |
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70 |
0 | 71 |
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72 /* Initialize SDL */ |
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73 if (SDL_Init(SDL_INIT_VIDEO) < 0) { |
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74 fprintf(stderr, "Couldn't initialize SDL: %s\n", SDL_GetError()); |
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75 return (1); |
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76 } |
0 | 77 |
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78 video_bpp = 0; |
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79 videoflags = SDL_SWSURFACE; |
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80 while (argc > 1) { |
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81 --argc; |
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82 if (strcmp(argv[argc - 1], "-bpp") == 0) { |
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83 video_bpp = atoi(argv[argc]); |
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84 --argc; |
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85 } else if (strcmp(argv[argc], "-warp") == 0) { |
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86 videoflags |= SDL_HWPALETTE; |
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87 } else if (strcmp(argv[argc], "-hw") == 0) { |
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88 videoflags |= SDL_HWSURFACE; |
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89 } else if (strcmp(argv[argc], "-fullscreen") == 0) { |
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90 videoflags |= SDL_FULLSCREEN; |
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91 } else { |
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92 fprintf(stderr, |
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93 "Usage: %s [-bpp N] [-warp] [-hw] [-fullscreen]\n", |
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94 argv[0]); |
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95 quit(1); |
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96 } |
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97 } |
0 | 98 |
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99 /* Set 640x480 video mode */ |
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100 if ((screen = SDL_SetVideoMode(640, 480, video_bpp, videoflags)) == NULL) { |
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101 fprintf(stderr, "Couldn't set 640x480x%d video mode: %s\n", |
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102 video_bpp, SDL_GetError()); |
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103 quit(2); |
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104 } |
0 | 105 |
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106 if (video_bpp == 8) { |
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107 /* Set a gray colormap, reverse order from white to black */ |
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108 for (i = 0; i < 256; ++i) { |
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109 palette[i].r = 255 - i; |
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110 palette[i].g = 255 - i; |
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111 palette[i].b = 255 - i; |
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112 } |
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113 SDL_SetColors(screen, palette, 0, 256); |
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114 } |
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115 |
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116 /* Set the surface pixels and refresh! */ |
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117 if (SDL_LockSurface(screen) < 0) { |
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118 fprintf(stderr, "Couldn't lock the display surface: %s\n", |
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119 SDL_GetError()); |
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120 quit(2); |
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121 } |
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122 buffer = (Uint8 *) screen->pixels; |
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123 if (screen->format->BytesPerPixel != 2) { |
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124 for (i = 0; i < screen->h; ++i) { |
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125 memset(buffer, (i * 255) / screen->h, screen->pitch); |
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126 buffer += screen->pitch; |
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127 } |
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128 } else { |
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129 for (i = 0; i < screen->h; ++i) { |
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130 gradient = ((i * 255) / screen->h); |
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131 color = SDL_MapRGB(screen->format, gradient, gradient, gradient); |
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132 buffer16 = (Uint16 *) buffer; |
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133 for (k = 0; k < screen->w; k++) { |
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134 *(buffer16 + k) = color; |
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135 } |
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136 buffer += screen->pitch; |
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137 } |
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138 } |
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139 SDL_UnlockSurface(screen); |
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140 SDL_UpdateRect(screen, 0, 0, 0, 0); |
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141 |
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142 /* Load the bitmap */ |
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143 bitmap = LoadXBM(screen, picture_width, picture_height, |
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144 (Uint8 *) picture_bits); |
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145 if (bitmap == NULL) { |
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146 quit(1); |
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147 } |
0 | 148 |
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149 /* Wait for a keystroke */ |
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150 done = 0; |
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151 while (!done) { |
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152 /* Check for events */ |
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153 while (SDL_PollEvent(&event)) { |
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154 switch (event.type) { |
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155 case SDL_MOUSEBUTTONDOWN: |
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156 { |
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157 SDL_Rect dst; |
0 | 158 |
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159 dst.x = event.button.x - bitmap->w / 2; |
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160 dst.y = event.button.y - bitmap->h / 2; |
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161 dst.w = bitmap->w; |
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162 dst.h = bitmap->h; |
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163 SDL_BlitSurface(bitmap, NULL, screen, &dst); |
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164 SDL_UpdateRects(screen, 1, &dst); |
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165 } |
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166 break; |
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167 case SDL_KEYDOWN: |
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168 /* Any key press quits the app... */ |
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169 done = 1; |
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170 break; |
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171 case SDL_QUIT: |
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172 done = 1; |
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173 break; |
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174 default: |
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175 break; |
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176 } |
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177 } |
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178 } |
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179 SDL_FreeSurface(bitmap); |
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180 SDL_Quit(); |
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181 return (0); |
0 | 182 } |