test/testbitmap.c
author Ryan C. Gordon <icculus@icculus.org>
Sun, 11 Jan 2009 04:05:28 +0000
changeset 3017 3272431eeee2
parent 2765 f55c87ae336b
child 3094 c0ce3380742d
permissions -rw-r--r--
Added testresample.c
     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
    13 quit(int rc)
    14 {
    15     SDL_Quit();
    16     exit(rc);
    17 }
    18 
    19 SDL_Surface *
    20 LoadXBM(SDL_Surface * screen, int w, int h, Uint8 * bits)
    21 {
    22     SDL_Surface *bitmap;
    23     Uint8 *line;
    24 
    25     /* Allocate the bitmap */
    26     bitmap = SDL_CreateRGBSurface(SDL_SWSURFACE, w, h, 1, 0, 0, 0, 0);
    27     if (bitmap == NULL) {
    28         fprintf(stderr, "Couldn't allocate bitmap: %s\n", SDL_GetError());
    29         return (NULL);
    30     }
    31 
    32     /* Copy the pixels */
    33     line = (Uint8 *) bitmap->pixels;
    34     w = (w + 7) / 8;
    35     while (h--) {
    36         memcpy(line, bits, w);
    37         /* X11 Bitmap images have the bits reversed */
    38         {
    39             int i, j;
    40             Uint8 *buf, byte;
    41             for (buf = line, i = 0; i < w; ++i, ++buf) {
    42                 byte = *buf;
    43                 *buf = 0;
    44                 for (j = 7; j >= 0; --j) {
    45                     *buf |= (byte & 0x01) << j;
    46                     byte >>= 1;
    47                 }
    48             }
    49         }
    50         line += bitmap->pitch;
    51         bits += w;
    52     }
    53     return (bitmap);
    54 }
    55 
    56 int
    57 main(int argc, char *argv[])
    58 {
    59     SDL_Surface *screen;
    60     SDL_Surface *bitmap;
    61     Uint8 video_bpp;
    62     Uint32 videoflags;
    63     Uint8 *buffer;
    64     int i, k, done;
    65     SDL_Event event;
    66     Uint16 *buffer16;
    67     Uint16 color;
    68     Uint8 gradient;
    69     SDL_Color palette[256];
    70 
    71     int video_w, video_h;
    72 
    73     /* Initialize SDL */
    74     if (SDL_Init(SDL_INIT_VIDEO) < 0) {
    75         fprintf(stderr, "Couldn't initialize SDL: %s\n", SDL_GetError());
    76         return (1);
    77     }
    78 
    79     video_bpp = 0;
    80     videoflags = SDL_SWSURFACE;
    81     while (argc > 1) {
    82         --argc;
    83         if (strcmp(argv[argc - 1], "-bpp") == 0) {
    84             video_bpp = atoi(argv[argc]);
    85             --argc;
    86         } else if (strcmp(argv[argc], "-warp") == 0) {
    87             videoflags |= SDL_HWPALETTE;
    88         } else if (strcmp(argv[argc], "-hw") == 0) {
    89             videoflags |= SDL_HWSURFACE;
    90         } else if (strcmp(argv[argc], "-fullscreen") == 0) {
    91             videoflags |= SDL_FULLSCREEN;
    92         } else {
    93             fprintf(stderr,
    94                     "Usage: %s [-bpp N] [-warp] [-hw] [-fullscreen]\n",
    95                     argv[0]);
    96             quit(1);
    97         }
    98     }
    99 
   100 #ifdef __IPHONEOS__
   101     video_w = 320;
   102     video_h = 480;
   103 #else
   104     video_w = 640;
   105     video_h = 480;
   106 #endif
   107 
   108     /* Set 640x480 video mode */
   109     if ((screen =
   110          SDL_SetVideoMode(video_w, video_h, video_bpp, videoflags)) == NULL) {
   111         fprintf(stderr, "Couldn't set %%d%d video mode: %s\n", video_w,
   112                 video_h, video_bpp, SDL_GetError());
   113         quit(2);
   114     }
   115 
   116     if (video_bpp == 8) {
   117         /* Set a gray colormap, reverse order from white to black */
   118         for (i = 0; i < 256; ++i) {
   119             palette[i].r = 255 - i;
   120             palette[i].g = 255 - i;
   121             palette[i].b = 255 - i;
   122         }
   123         SDL_SetColors(screen, palette, 0, 256);
   124     }
   125 
   126     /* Set the surface pixels and refresh! */
   127     if (SDL_LockSurface(screen) < 0) {
   128         fprintf(stderr, "Couldn't lock the display surface: %s\n",
   129                 SDL_GetError());
   130         quit(2);
   131     }
   132     buffer = (Uint8 *) screen->pixels;
   133     if (screen->format->BytesPerPixel != 2) {
   134         for (i = 0; i < screen->h; ++i) {
   135             memset(buffer, (i * 255) / screen->h, screen->pitch);
   136             buffer += screen->pitch;
   137         }
   138     } else {
   139         for (i = 0; i < screen->h; ++i) {
   140             gradient = ((i * 255) / screen->h);
   141             color = SDL_MapRGB(screen->format, gradient, gradient, gradient);
   142             buffer16 = (Uint16 *) buffer;
   143             for (k = 0; k < screen->w; k++) {
   144                 *(buffer16 + k) = color;
   145             }
   146             buffer += screen->pitch;
   147         }
   148     }
   149     SDL_UnlockSurface(screen);
   150     SDL_UpdateRect(screen, 0, 0, 0, 0);
   151 
   152     /* Load the bitmap */
   153     bitmap = LoadXBM(screen, picture_width, picture_height,
   154                      (Uint8 *) picture_bits);
   155     if (bitmap == NULL) {
   156         quit(1);
   157     }
   158 
   159     /* Wait for a keystroke */
   160     done = 0;
   161     while (!done) {
   162         /* Check for events */
   163         while (SDL_PollEvent(&event)) {
   164             switch (event.type) {
   165             case SDL_MOUSEBUTTONDOWN:
   166                 {
   167                     SDL_Rect dst;
   168 
   169                     dst.x = event.button.x - bitmap->w / 2;
   170                     dst.y = event.button.y - bitmap->h / 2;
   171                     dst.w = bitmap->w;
   172                     dst.h = bitmap->h;
   173                     SDL_BlitSurface(bitmap, NULL, screen, &dst);
   174                     SDL_UpdateRects(screen, 1, &dst);
   175                 }
   176                 break;
   177             case SDL_KEYDOWN:
   178                 /* Any key press quits the app... */
   179                 done = 1;
   180                 break;
   181             case SDL_QUIT:
   182                 done = 1;
   183                 break;
   184             default:
   185                 break;
   186             }
   187         }
   188     }
   189     SDL_FreeSurface(bitmap);
   190     SDL_Quit();
   191     return (0);
   192 }