test/testbitmap.c
author Sam Lantinga <slouken@lokigames.com>
Thu, 26 Apr 2001 16:45:43 +0000
changeset 0 74212992fb08
child 691 609543e2b3a1
permissions -rw-r--r--
Initial revision
     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 SDL_Surface *LoadXBM(SDL_Surface *screen, int w, int h, Uint8 *bits)
    12 {
    13 	SDL_Surface *bitmap;
    14 	Uint8 *line;
    15 
    16 	/* Allocate the bitmap */
    17 	bitmap = SDL_CreateRGBSurface(SDL_SWSURFACE, w, h, 1, 0, 0, 0, 0);
    18 	if ( bitmap == NULL ) {
    19 		fprintf(stderr, "Couldn't allocate bitmap: %s\n",
    20 						SDL_GetError());
    21 		return(NULL);
    22 	}
    23 
    24 	/* Copy the pixels */
    25 	line = (Uint8 *)bitmap->pixels;
    26 	w = (w+7)/8;
    27 	while ( h-- ) {
    28 		memcpy(line, bits, w);
    29 		/* X11 Bitmap images have the bits reversed */
    30 		{ int i, j; Uint8 *buf, byte;
    31 			for ( buf=line, i=0; i<w; ++i, ++buf ) {
    32 				byte = *buf;
    33 				*buf = 0;
    34 				for ( j=7; j>=0; --j ) {
    35 					*buf |= (byte&0x01)<<j;
    36 					byte >>= 1;
    37 				}
    38 			}
    39 		}
    40 		line += bitmap->pitch;
    41 		bits += w;
    42 	}
    43 	return(bitmap);
    44 }
    45 
    46 int main(int argc, char *argv[])
    47 {
    48 	SDL_Surface *screen;
    49 	SDL_Surface *bitmap;
    50 	Uint8  video_bpp;
    51 	Uint32 videoflags;
    52 	Uint8 *buffer;
    53 	int i, done;
    54 	SDL_Event event;
    55 
    56 	/* Initialize SDL */
    57 	if ( SDL_Init(SDL_INIT_VIDEO) < 0 ) {
    58 		fprintf(stderr, "Couldn't initialize SDL: %s\n",SDL_GetError());
    59 		exit(1);
    60 	}
    61 	atexit(SDL_Quit);
    62 
    63 	video_bpp = 0;
    64 	videoflags = SDL_SWSURFACE;
    65 	while ( argc > 1 ) {
    66 		--argc;
    67 		if ( strcmp(argv[argc-1], "-bpp") == 0 ) {
    68 			video_bpp = atoi(argv[argc]);
    69 			--argc;
    70 		} else
    71 		if ( strcmp(argv[argc], "-warp") == 0 ) {
    72 			videoflags |= SDL_HWPALETTE;
    73 		} else
    74 		if ( strcmp(argv[argc], "-hw") == 0 ) {
    75 			videoflags |= SDL_HWSURFACE;
    76 		} else
    77 		if ( strcmp(argv[argc], "-fullscreen") == 0 ) {
    78 			videoflags |= SDL_FULLSCREEN;
    79 		} else {
    80 			fprintf(stderr,
    81 			"Usage: %s [-bpp N] [-warp] [-hw] [-fullscreen]\n",
    82 								argv[0]);
    83 			exit(1);
    84 		}
    85 	}
    86 
    87 	/* Set 640x480 video mode */
    88 	if ( (screen=SDL_SetVideoMode(640,480,video_bpp,videoflags)) == NULL ) {
    89 		fprintf(stderr, "Couldn't set 640x480x%d video mode: %s\n",
    90 						video_bpp, SDL_GetError());
    91 		exit(2);
    92 	}
    93 
    94 	/* Set the surface pixels and refresh! */
    95 	if ( SDL_LockSurface(screen) < 0 ) {
    96 		fprintf(stderr, "Couldn't lock the display surface: %s\n",
    97 							SDL_GetError());
    98 		exit(2);
    99 	}
   100 	buffer=(Uint8 *)screen->pixels;
   101 	for ( i=0; i<screen->h; ++i ) {
   102 		memset(buffer,(i*255)/screen->h, screen->pitch);
   103 		buffer += screen->pitch;
   104 	}
   105 	SDL_UnlockSurface(screen);
   106 	SDL_UpdateRect(screen, 0, 0, 0, 0);
   107 
   108 	/* Load the bitmap */
   109 	bitmap = LoadXBM(screen, picture_width, picture_height,
   110 					(Uint8 *)picture_bits);
   111 	if ( bitmap == NULL ) {
   112 		exit(1);
   113 	}
   114 
   115 	/* Wait for a keystroke */
   116 	done = 0;
   117 	while ( !done ) {
   118 		/* Check for events */
   119 		while ( SDL_PollEvent(&event) ) {
   120 			switch (event.type) {
   121 				case SDL_MOUSEBUTTONDOWN: {
   122 					SDL_Rect dst;
   123 
   124 					dst.x = event.button.x - bitmap->w/2;
   125 					dst.y = event.button.y - bitmap->h/2;
   126 					dst.w = bitmap->w;
   127 					dst.h = bitmap->h;
   128 					SDL_BlitSurface(bitmap, NULL,
   129 								screen, &dst);
   130 					SDL_UpdateRects(screen,1,&dst);
   131 					}
   132 					break;
   133 				case SDL_KEYDOWN:
   134 					/* Any key press quits the app... */
   135 					done = 1;
   136 					break;
   137 				case SDL_QUIT:
   138 					done = 1;
   139 					break;
   140 				default:
   141 					break;
   142 			}
   143 		}
   144 	}
   145 	SDL_FreeSurface(bitmap);
   146 	return(0);
   147 }