test/testbitmap.c
author Sam Lantinga <slouken@libsdl.org>
Sat, 26 Sep 2009 23:17:08 +0000
branchSDL-1.2
changeset 4246 8b8314cc34a6
parent 1151 be9c9c8f6d53
child 1662 782fd950bd46
child 1895 c121d94672cb
permissions -rw-r--r--
Fixed bug #810

Lauri Kenttä 2009-09-26 06:42:23 PDT

Support for disabling stdio redirect with environment variables.
     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 }