view test/testbitmap.c @ 1790:828a17e05192

Date: Mon, 8 May 2006 14:19:30 -0700 From: Bob Ippolito Subject: SDL trunk (r2346) and Mac OS X The current state of the trunk doesn't quite compile on Mac OS X, I've attached a series of patches that gets it to compile and kills a few warnings. sdl-trunk-r2346-dlcompat-warnings.diff: The dlcompat thing is just loaded with incorrect type signatures .. some of them have changed since 10.2 and others are just flat wrong. This puts it in sync with the latest headers. People on 10.2 will get the warnings instead of people with new kits.
author Sam Lantinga <slouken@libsdl.org>
date Tue, 09 May 2006 07:26:58 +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);
}