126 lines
2.7 KiB
C
126 lines
2.7 KiB
C
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/* Simple program: Test bitmap blits */
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include "SDL.h"
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#include "picture.xbm"
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SDL_Surface *LoadXBM(SDL_Surface *screen, int w, int h, Uint8 *bits)
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{
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SDL_Surface *bitmap;
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Uint8 *line;
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/* Allocate the bitmap */
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bitmap = SDL_CreateRGBSurface(SDL_SWSURFACE, w, h, 1, 0, 0, 0, 0);
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if ( bitmap == NULL ) {
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fprintf(stderr, "Couldn't allocate bitmap: %s\n",
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SDL_GetError());
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return(NULL);
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}
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/* Copy the pixels */
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line = (Uint8 *)bitmap->pixels;
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w = (w+7)/8;
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while ( h-- ) {
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memcpy(line, bits, w);
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/* X11 Bitmap images have the bits reversed */
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{ int i, j; Uint8 *buf, byte;
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for ( buf=line, i=0; i<w; ++i, ++buf ) {
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byte = *buf;
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*buf = 0;
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for ( j=7; j>=0; --j ) {
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*buf |= (byte&0x01)<<j;
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byte >>= 1;
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}
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}
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}
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line += bitmap->pitch;
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bits += w;
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}
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return(bitmap);
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}
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void app_main(int argc, char *argv[])
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{
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SDL_Surface *screen;
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SDL_Surface *bitmap;
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Uint8 video_bpp;
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Uint32 videoflags;
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Uint8 *buffer;
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int i, done;
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SDL_Event event;
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/* Initialize SDL */
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if ( SDL_Init(SDL_INIT_VIDEO) < 0 ) {
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fprintf(stderr, "Couldn't initialize SDL: %s\n",SDL_GetError());
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exit(1);
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}
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atexit(SDL_Quit);
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video_bpp = 0;
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videoflags = SDL_SWSURFACE;
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/* Set 640x480 video mode */
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if ( (screen=SDL_SetVideoMode(640,480,video_bpp,videoflags)) == NULL ) {
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fprintf(stderr, "Couldn't set 640x480x%d video mode: %s\n",
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video_bpp, SDL_GetError());
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exit(2);
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}
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/* Set the surface pixels and refresh! */
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if ( SDL_LockSurface(screen) < 0 ) {
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fprintf(stderr, "Couldn't lock the display surface: %s\n",
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SDL_GetError());
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exit(2);
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}
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buffer=(Uint8 *)screen->pixels;
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for ( i=0; i<screen->h; ++i ) {
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memset(buffer,(i*255)/screen->h, screen->pitch);
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buffer += screen->pitch;
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}
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SDL_UnlockSurface(screen);
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SDL_UpdateRect(screen, 0, 0, 0, 0);
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/* Load the bitmap */
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bitmap = LoadXBM(screen, picture_width, picture_height,
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(Uint8 *)picture_bits);
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if ( bitmap == NULL ) {
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exit(1);
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}
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/* Wait for a keystroke */
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done = 0;
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while ( !done ) {
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/* Check for events */
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while ( SDL_PollEvent(&event) ) {
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switch (event.type) {
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case SDL_MOUSEBUTTONDOWN: {
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SDL_Rect dst;
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dst.x = event.button.x - bitmap->w/2;
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dst.y = event.button.y - bitmap->h/2;
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dst.w = bitmap->w;
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dst.h = bitmap->h;
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SDL_BlitSurface(bitmap, NULL,
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screen, &dst);
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SDL_UpdateRects(screen,1,&dst);
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}
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break;
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case SDL_KEYDOWN:
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/* Any key press quits the app... */
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done = 1;
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break;
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case SDL_QUIT:
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done = 1;
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break;
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default:
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break;
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}
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}
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}
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SDL_FreeSurface(bitmap);
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return(0);
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}
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