| 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 | } |