Mercurial > sdl-ios-xcode
view test/testbitmap.c @ 1230:88c2d6aed428
From Mike Frysinger and/or Gentoo:
- libsdl-PIC-load-mmx-masks-from-stack.patch
this one may be a little controversial ... the fix here is again that you cant
reference the memory addresses like this to load into a mmx register, so the
way to do it is to push two 32bit words onto the stack, load the 64bit value
off of the stack into the mmx register, and then adjust the stack so that
it's back to normal.
author | Ryan C. Gordon <icculus@icculus.org> |
---|---|
date | Thu, 05 Jan 2006 15:25:19 +0000 |
parents | be9c9c8f6d53 |
children | 782fd950bd46 c121d94672cb |
line wrap: on
line source
/* Simple program: Test bitmap blits */ #include <stdio.h> #include <stdlib.h> #include <string.h> #include "SDL.h" #include "picture.xbm" /* Call this instead of exit(), so we can clean up SDL: atexit() is evil. */ static void quit(int rc) { SDL_Quit(); exit(rc); } SDL_Surface *LoadXBM(SDL_Surface *screen, int w, int h, Uint8 *bits) { SDL_Surface *bitmap; Uint8 *line; /* Allocate the bitmap */ bitmap = SDL_CreateRGBSurface(SDL_SWSURFACE, w, h, 1, 0, 0, 0, 0); if ( bitmap == NULL ) { fprintf(stderr, "Couldn't allocate bitmap: %s\n", SDL_GetError()); return(NULL); } /* Copy the pixels */ line = (Uint8 *)bitmap->pixels; w = (w+7)/8; while ( h-- ) { memcpy(line, bits, w); /* X11 Bitmap images have the bits reversed */ { int i, j; Uint8 *buf, byte; for ( buf=line, i=0; i<w; ++i, ++buf ) { byte = *buf; *buf = 0; for ( j=7; j>=0; --j ) { *buf |= (byte&0x01)<<j; byte >>= 1; } } } line += bitmap->pitch; bits += w; } return(bitmap); } int main(int argc, char *argv[]) { SDL_Surface *screen; SDL_Surface *bitmap; Uint8 video_bpp; Uint32 videoflags; Uint8 *buffer; int i, k, done; SDL_Event event; Uint16 *buffer16; Uint16 color; Uint8 gradient; SDL_Color palette[256]; /* Initialize SDL */ if ( SDL_Init(SDL_INIT_VIDEO) < 0 ) { fprintf(stderr, "Couldn't initialize SDL: %s\n",SDL_GetError()); return(1); } video_bpp = 0; videoflags = SDL_SWSURFACE; while ( argc > 1 ) { --argc; if ( strcmp(argv[argc-1], "-bpp") == 0 ) { video_bpp = atoi(argv[argc]); --argc; } else if ( strcmp(argv[argc], "-warp") == 0 ) { videoflags |= SDL_HWPALETTE; } else if ( strcmp(argv[argc], "-hw") == 0 ) { videoflags |= SDL_HWSURFACE; } else if ( strcmp(argv[argc], "-fullscreen") == 0 ) { videoflags |= SDL_FULLSCREEN; } else { fprintf(stderr, "Usage: %s [-bpp N] [-warp] [-hw] [-fullscreen]\n", argv[0]); quit(1); } } /* Set 640x480 video mode */ if ( (screen=SDL_SetVideoMode(640,480,video_bpp,videoflags)) == NULL ) { fprintf(stderr, "Couldn't set 640x480x%d video mode: %s\n", video_bpp, SDL_GetError()); quit(2); } if (video_bpp==8) { /* Set a gray colormap, reverse order from white to black */ for ( i=0; i<256; ++i ) { palette[i].r = 255-i; palette[i].g = 255-i; palette[i].b = 255-i; } SDL_SetColors(screen, palette, 0, 256); } /* Set the surface pixels and refresh! */ if ( SDL_LockSurface(screen) < 0 ) { fprintf(stderr, "Couldn't lock the display surface: %s\n", SDL_GetError()); quit(2); } buffer=(Uint8 *)screen->pixels; if (screen->format->BytesPerPixel!=2) { for ( i=0; i<screen->h; ++i ) { memset(buffer,(i*255)/screen->h, screen->pitch); buffer += screen->pitch; } } else { for ( i=0; i<screen->h; ++i ) { gradient=((i*255)/screen->h); color = SDL_MapRGB(screen->format, gradient, gradient, gradient); buffer16=(Uint16*)buffer; for (k=0; k<screen->w; k++) { *(buffer16+k)=color; } buffer += screen->pitch; } } SDL_UnlockSurface(screen); SDL_UpdateRect(screen, 0, 0, 0, 0); /* Load the bitmap */ bitmap = LoadXBM(screen, picture_width, picture_height, (Uint8 *)picture_bits); if ( bitmap == NULL ) { quit(1); } /* Wait for a keystroke */ done = 0; while ( !done ) { /* Check for events */ while ( SDL_PollEvent(&event) ) { switch (event.type) { case SDL_MOUSEBUTTONDOWN: { SDL_Rect dst; dst.x = event.button.x - bitmap->w/2; dst.y = event.button.y - bitmap->h/2; dst.w = bitmap->w; dst.h = bitmap->h; SDL_BlitSurface(bitmap, NULL, screen, &dst); SDL_UpdateRects(screen,1,&dst); } break; case SDL_KEYDOWN: /* Any key press quits the app... */ done = 1; break; case SDL_QUIT: done = 1; break; default: break; } } } SDL_FreeSurface(bitmap); SDL_Quit(); return(0); }