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 11 /* Call this instead of exit(), so we can clean up SDL: atexit() is evil. */ 12 static void quit(int rc) 13 { 14 SDL_Quit(); 15 exit(rc); 16 } 17 18 SDL_Surface *LoadXBM(SDL_Surface *screen, int w, int h, Uint8 *bits) 19 { 20 SDL_Surface *bitmap; 21 Uint8 *line; 22 23 /* Allocate the bitmap */ 24 bitmap = SDL_CreateRGBSurface(SDL_SWSURFACE, w, h, 1, 0, 0, 0, 0); 25 if ( bitmap == NULL ) { 26 fprintf(stderr, "Couldn't allocate bitmap: %s\n", 27 SDL_GetError()); 28 return(NULL); 29 } 30 31 /* Copy the pixels */ 32 line = (Uint8 *)bitmap->pixels; 33 w = (w+7)/8; 34 while ( h-- ) { 35 memcpy(line, bits, w); 36 /* X11 Bitmap images have the bits reversed */ 37 { int i, j; Uint8 *buf, byte; 38 for ( buf=line, i=0; i<w; ++i, ++buf ) { 39 byte = *buf; 40 *buf = 0; 41 for ( j=7; j>=0; --j ) { 42 *buf |= (byte&0x01)<<j; 43 byte >>= 1; 44 } 45 } 46 } 47 line += bitmap->pitch; 48 bits += w; 49 } 50 return(bitmap); 51 } 52 53 int main(int argc, char *argv[]) 54 { 55 SDL_Surface *screen; 56 SDL_Surface *bitmap; 57 Uint8 video_bpp; 58 Uint32 videoflags; 59 Uint8 *buffer; 60 int i, k, done; 61 SDL_Event event; 62 Uint16 *buffer16; 63 Uint16 color; 64 Uint8 gradient; 65 SDL_Color palette[256]; 66 67 68 /* Initialize SDL */ 69 if ( SDL_Init(SDL_INIT_VIDEO) < 0 ) { 70 fprintf(stderr, "Couldn't initialize SDL: %s\n",SDL_GetError()); 71 return(1); 72 } 73 74 video_bpp = 0; 75 videoflags = SDL_SWSURFACE; 76 while ( argc > 1 ) { 77 --argc; 78 if ( strcmp(argv[argc-1], "-bpp") == 0 ) { 79 video_bpp = atoi(argv[argc]); 80 --argc; 81 } else 82 if ( strcmp(argv[argc], "-warp") == 0 ) { 83 videoflags |= SDL_HWPALETTE; 84 } else 85 if ( strcmp(argv[argc], "-hw") == 0 ) { 86 videoflags |= SDL_HWSURFACE; 87 } else 88 if ( strcmp(argv[argc], "-fullscreen") == 0 ) { 89 videoflags |= SDL_FULLSCREEN; 90 } else { 91 fprintf(stderr, 92 "Usage: %s [-bpp N] [-warp] [-hw] [-fullscreen]\n", 93 argv[0]); 94 quit(1); 95 } 96 } 97 98 /* Set 640x480 video mode */ 99 if ( (screen=SDL_SetVideoMode(640,480,video_bpp,videoflags)) == NULL ) { 100 fprintf(stderr, "Couldn't set 640x480x%d video mode: %s\n", 101 video_bpp, SDL_GetError()); 102 quit(2); 103 } 104 105 if (video_bpp==8) { 106 /* Set a gray colormap, reverse order from white to black */ 107 for ( i=0; i<256; ++i ) { 108 palette[i].r = 255-i; 109 palette[i].g = 255-i; 110 palette[i].b = 255-i; 111 } 112 SDL_SetColors(screen, palette, 0, 256); 113 } 114 115 /* Set the surface pixels and refresh! */ 116 if ( SDL_LockSurface(screen) < 0 ) { 117 fprintf(stderr, "Couldn't lock the display surface: %s\n", 118 SDL_GetError()); 119 quit(2); 120 } 121 buffer=(Uint8 *)screen->pixels; 122 if (screen->format->BytesPerPixel!=2) { 123 for ( i=0; i<screen->h; ++i ) { 124 memset(buffer,(i*255)/screen->h, screen->pitch); 125 buffer += screen->pitch; 126 } 127 } 128 else 129 { 130 for ( i=0; i<screen->h; ++i ) { 131 gradient=((i*255)/screen->h); 132 color = SDL_MapRGB(screen->format, gradient, gradient, gradient); 133 buffer16=(Uint16*)buffer; 134 for (k=0; k<screen->w; k++) 135 { 136 *(buffer16+k)=color; 137 } 138 buffer += screen->pitch; 139 } 140 } 141 SDL_UnlockSurface(screen); 142 SDL_UpdateRect(screen, 0, 0, 0, 0); 143 144 /* Load the bitmap */ 145 bitmap = LoadXBM(screen, picture_width, picture_height, 146 (Uint8 *)picture_bits); 147 if ( bitmap == NULL ) { 148 quit(1); 149 } 150 151 /* Wait for a keystroke */ 152 done = 0; 153 while ( !done ) { 154 /* Check for events */ 155 while ( SDL_PollEvent(&event) ) { 156 switch (event.type) { 157 case SDL_MOUSEBUTTONDOWN: { 158 SDL_Rect dst; 159 160 dst.x = event.button.x - bitmap->w/2; 161 dst.y = event.button.y - bitmap->h/2; 162 dst.w = bitmap->w; 163 dst.h = bitmap->h; 164 SDL_BlitSurface(bitmap, NULL, 165 screen, &dst); 166 SDL_UpdateRects(screen,1,&dst); 167 } 168 break; 169 case SDL_KEYDOWN: 170 /* Any key press quits the app... */ 171 done = 1; 172 break; 173 case SDL_QUIT: 174 done = 1; 175 break; 176 default: 177 break; 178 } 179 } 180 } 181 SDL_FreeSurface(bitmap); 182 SDL_Quit(); 183 return(0); 184 } 185
