IMG_lbm.c
author Sam Lantinga <slouken@libsdl.org>
Mon, 10 May 2010 22:40:18 -0700
changeset 251 a6565b353095
parent 236 cce1251de477
child 280 ec4ae96c100c
permissions -rw-r--r--
Fixed decoding HAM6 image with masking
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/*
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    SDL_image:  An example image loading library for use with SDL
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    Copyright (C) 1997-2009 Sam Lantinga
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    This library is free software; you can redistribute it and/or
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    modify it under the terms of the GNU Lesser General Public
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    License as published by the Free Software Foundation; either
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    version 2.1 of the License, or (at your option) any later version.
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    This library is distributed in the hope that it will be useful,
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    but WITHOUT ANY WARRANTY; without even the implied warranty of
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    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
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    Lesser General Public License for more details.
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    You should have received a copy of the GNU Lesser General Public
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    License along with this library; if not, write to the Free Software
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    Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
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    Sam Lantinga
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    slouken@libsdl.org
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*/
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/* This is a ILBM image file loading framework
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   Load IFF pictures, PBM & ILBM packing methods, with or without stencil
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   Written by Daniel Morais ( Daniel AT Morais DOT com ) in September 2001.
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   24 bits ILBM files support added by Marc Le Douarain (http://www.multimania.com/mavati)
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   in December 2002.
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   EHB and HAM (specific Amiga graphic chip modes) support added by Marc Le Douarain
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   (http://www.multimania.com/mavati) in December 2003.
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   Stencil and colorkey fixes by David Raulo (david.raulo AT free DOT fr) in February 2004.
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   Buffer overflow fix in RLE decompression by David Raulo in January 2008.
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*/
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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_endian.h"
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#include "SDL_image.h"
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#ifdef LOAD_LBM
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#define MAXCOLORS 256
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/* Structure for an IFF picture ( BMHD = Bitmap Header ) */
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typedef struct
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{
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    Uint16 w, h;		/* width & height of the bitmap in pixels */
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    Sint16 x, y;		/* screen coordinates of the bitmap */
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    Uint8 planes;		/* number of planes of the bitmap */
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    Uint8 mask;			/* mask type ( 0 => no mask ) */
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    Uint8 tcomp;		/* compression type */
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    Uint8 pad1;			/* dummy value, for padding */
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    Uint16 tcolor;		/* transparent color */
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    Uint8 xAspect,		/* pixel aspect ratio */
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          yAspect;
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    Sint16  Lpage;		/* width of the screen in pixels */
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    Sint16  Hpage;		/* height of the screen in pixels */
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} BMHD;
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int IMG_isLBM( SDL_RWops *src )
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{
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	int start;
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	int   is_LBM;
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	Uint8 magic[4+4+4];
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	if ( !src ) 
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		return 0;
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	start = SDL_RWtell(src);
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	is_LBM = 0;
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	if ( SDL_RWread( src, magic, sizeof(magic), 1 ) )
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	{
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		if ( !memcmp( magic, "FORM", 4 ) &&
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			( !memcmp( magic + 8, "PBM ", 4 ) ||
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			  !memcmp( magic + 8, "ILBM", 4 ) ) )
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		{
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			is_LBM = 1;
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		}
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	}
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	SDL_RWseek(src, start, RW_SEEK_SET);
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	return( is_LBM );
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}
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SDL_Surface *IMG_LoadLBM_RW( SDL_RWops *src )
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{
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	int start;
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	SDL_Surface *Image;
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	Uint8       id[4], pbm, colormap[MAXCOLORS*3], *MiniBuf, *ptr, count, color, msk;
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	Uint32      size, bytesloaded, nbcolors;
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	Uint32      i, j, bytesperline, nbplanes, stencil, plane, h;
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	Uint32      remainingbytes;
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	Uint32      width;
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	BMHD	      bmhd;
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	char        *error;
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	Uint8       flagHAM,flagEHB;
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	Image   = NULL;
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	error   = NULL;
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	MiniBuf = NULL;
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	if ( !src ) {
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		/* The error message has been set in SDL_RWFromFile */
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		return NULL;
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	}
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	start = SDL_RWtell(src);
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	if ( !SDL_RWread( src, id, 4, 1 ) )
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	{
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		error="error reading IFF chunk";
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		goto done;
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	}
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	/* Should be the size of the file minus 4+4 ( 'FORM'+size ) */
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	if ( !SDL_RWread( src, &size, 4, 1 ) )
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	{
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		error="error reading IFF chunk size";
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		goto done;
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	}
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	/* As size is not used here, no need to swap it */
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	if ( memcmp( id, "FORM", 4 ) != 0 )
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	{
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		error="not a IFF file";
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		goto done;
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	}
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	if ( !SDL_RWread( src, id, 4, 1 ) )
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	{
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		error="error reading IFF chunk";
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		goto done;
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	}
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	pbm = 0;
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	/* File format : PBM=Packed Bitmap, ILBM=Interleaved Bitmap */
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	if ( !memcmp( id, "PBM ", 4 ) ) pbm = 1;
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	else if ( memcmp( id, "ILBM", 4 ) )
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	{
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		error="not a IFF picture";
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		goto done;
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	}
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	nbcolors = 0;
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	memset( &bmhd, 0, sizeof( BMHD ) );
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	flagHAM = 0;
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	flagEHB = 0;
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	while ( memcmp( id, "BODY", 4 ) != 0 )
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	{
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		if ( !SDL_RWread( src, id, 4, 1 ) ) 
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		{
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			error="error reading IFF chunk";
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			goto done;
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		}
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		if ( !SDL_RWread( src, &size, 4, 1 ) )
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		{
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			error="error reading IFF chunk size";
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			goto done;
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		}
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		bytesloaded = 0;
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		size = SDL_SwapBE32( size );
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		if ( !memcmp( id, "BMHD", 4 ) ) /* Bitmap header */
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		{
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			if ( !SDL_RWread( src, &bmhd, sizeof( BMHD ), 1 ) )
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			{
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				error="error reading BMHD chunk";
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				goto done;
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			}
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			bytesloaded = sizeof( BMHD );
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			bmhd.w 		= SDL_SwapBE16( bmhd.w );
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			bmhd.h 		= SDL_SwapBE16( bmhd.h );
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			bmhd.x 		= SDL_SwapBE16( bmhd.x );
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			bmhd.y 		= SDL_SwapBE16( bmhd.y );
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			bmhd.tcolor = SDL_SwapBE16( bmhd.tcolor );
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			bmhd.Lpage 	= SDL_SwapBE16( bmhd.Lpage );
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			bmhd.Hpage 	= SDL_SwapBE16( bmhd.Hpage );
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		}
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		if ( !memcmp( id, "CMAP", 4 ) ) /* palette ( Color Map ) */
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		{
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			if ( !SDL_RWread( src, &colormap, size, 1 ) )
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			{
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				error="error reading CMAP chunk";
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				goto done;
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			}
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			bytesloaded = size;
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			nbcolors = size / 3;
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		}
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		if ( !memcmp( id, "CAMG", 4 ) ) /* Amiga ViewMode  */
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		{
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			Uint32 viewmodes;
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			if ( !SDL_RWread( src, &viewmodes, sizeof(viewmodes), 1 ) )
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			{
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				error="error reading CAMG chunk";
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				goto done;
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			}
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			bytesloaded = size;
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			viewmodes = SDL_SwapBE32( viewmodes );
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			if ( viewmodes & 0x0800 )
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				flagHAM = 1;
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			if ( viewmodes & 0x0080 )
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				flagEHB = 1;
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		}
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		if ( memcmp( id, "BODY", 4 ) )
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		{
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			if ( size & 1 )	++size;  	/* padding ! */
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			size -= bytesloaded;
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			/* skip the remaining bytes of this chunk */
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			if ( size )	SDL_RWseek( src, size, RW_SEEK_CUR );
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		}
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	}
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	/* compute some usefull values, based on the bitmap header */
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	width = ( bmhd.w + 15 ) & 0xFFFFFFF0;  /* Width in pixels modulo 16 */
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	bytesperline = ( ( bmhd.w + 15 ) / 16 ) * 2;
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	nbplanes = bmhd.planes;
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	if ( pbm )                         /* File format : 'Packed Bitmap' */
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	{
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		bytesperline *= 8;
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		nbplanes = 1;
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	}
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	stencil = (bmhd.mask & 1);   /* There is a mask ( 'stencil' ) */
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	/* Allocate memory for a temporary buffer ( used for
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           decompression/deinterleaving ) */
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	MiniBuf = (void *)malloc( bytesperline * (nbplanes + stencil) );
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	if ( MiniBuf == NULL )
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	{
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		error="no enough memory for temporary buffer";
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		goto done;
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   251
	}
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	if ( ( Image = SDL_CreateRGBSurface( SDL_SWSURFACE, width, bmhd.h, (bmhd.planes==24 || flagHAM==1)?24:8, 0, 0, 0, 0 ) ) == NULL )
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	   goto done;
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   256
	if ( bmhd.mask & 2 )               /* There is a transparent color */
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		SDL_SetColorKey( Image, SDL_SRCCOLORKEY, bmhd.tcolor );
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	/* Update palette informations */
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   260
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	/* There is no palette in 24 bits ILBM file */
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	if ( nbcolors>0 && flagHAM==0 )
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	{
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		/* FIXME: Should this include the stencil? See comment below */
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		int nbrcolorsfinal = 1 << (nbplanes + stencil);
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		ptr = &colormap[0];
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   268
		for ( i=0; i<nbcolors; i++ )
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		{
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   270
			Image->format->palette->colors[i].r = *ptr++;
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			Image->format->palette->colors[i].g = *ptr++;
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			Image->format->palette->colors[i].b = *ptr++;
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		}
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   274
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   275
		/* Amiga EHB mode (Extra-Half-Bright) */
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   276
		/* 6 bitplanes mode with a 32 colors palette */
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		/* The 32 last colors are the same but divided by 2 */
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		/* Some Amiga pictures save 64 colors with 32 last wrong colors, */
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		/* they shouldn't !, and here we overwrite these 32 bad colors. */
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   280
		if ( (nbcolors==32 || flagEHB ) && (1<<bmhd.planes)==64 )
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   281
		{
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   282
			nbcolors = 64;
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   283
			ptr = &colormap[0];
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   284
			for ( i=32; i<64; i++ )
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   285
			{
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   286
				Image->format->palette->colors[i].r = (*ptr++)/2;
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   287
				Image->format->palette->colors[i].g = (*ptr++)/2;
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   288
				Image->format->palette->colors[i].b = (*ptr++)/2;
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   289
			}
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   290
		}
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   291
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   292
		/* If nbcolors < 2^nbplanes, repeat the colormap */
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   293
		/* This happens when pictures have a stencil mask */
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   294
		if ( nbrcolorsfinal > (1<<bmhd.planes) ) {
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   295
			nbrcolorsfinal = (1<<bmhd.planes);
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   296
		}
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   297
		for ( i=nbcolors; i < (Uint32)nbrcolorsfinal; i++ )
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   298
		{
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   299
			Image->format->palette->colors[i].r = Image->format->palette->colors[i%nbcolors].r;
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   300
			Image->format->palette->colors[i].g = Image->format->palette->colors[i%nbcolors].g;
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   301
			Image->format->palette->colors[i].b = Image->format->palette->colors[i%nbcolors].b;
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   302
		}
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   303
		if ( !pbm )
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   304
			Image->format->palette->ncolors = nbrcolorsfinal;
slouken@45
   305
	}
slouken@45
   306
slouken@50
   307
	/* Get the bitmap */
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   308
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   309
	for ( h=0; h < bmhd.h; h++ )
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   310
	{
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   311
		/* uncompress the datas of each planes */
slouken@74
   312
slouken@251
   313
		for ( plane=0; plane < (nbplanes+stencil); plane++ )
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   314
		{
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   315
			ptr = MiniBuf + ( plane * bytesperline );
slouken@74
   316
slouken@45
   317
			remainingbytes = bytesperline;
slouken@74
   318
slouken@50
   319
			if ( bmhd.tcomp == 1 )	    /* Datas are compressed */
slouken@45
   320
			{
slouken@74
   321
				do
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   322
				{
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   323
					if ( !SDL_RWread( src, &count, 1, 1 ) )
slouken@45
   324
					{
slouken@74
   325
						error="error reading BODY chunk";
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   326
						goto done;
slouken@45
   327
					}
slouken@74
   328
slouken@45
   329
					if ( count & 0x80 )
slouken@45
   330
					{
slouken@74
   331
						count ^= 0xFF;
slouken@74
   332
						count += 2; /* now it */
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   333
icculus@183
   334
						if ( ( count > remainingbytes ) || !SDL_RWread( src, &color, 1, 1 ) )
slouken@45
   335
						{
slouken@251
   336
							error="error reading BODY chunk";
slouken@45
   337
							goto done;
slouken@45
   338
						}
slouken@45
   339
						memset( ptr, color, count );
slouken@45
   340
					}
slouken@45
   341
					else
slouken@45
   342
					{
slouken@74
   343
						++count;
slouken@45
   344
icculus@183
   345
						if ( ( count > remainingbytes ) || !SDL_RWread( src, ptr, count, 1 ) )
slouken@45
   346
						{
slouken@45
   347
						   error="error reading BODY chunk";
slouken@45
   348
							goto done;
slouken@45
   349
						}
slouken@45
   350
					}
slouken@74
   351
slouken@45
   352
					ptr += count;
slouken@45
   353
					remainingbytes -= count;
slouken@74
   354
slouken@45
   355
				} while ( remainingbytes > 0 );
slouken@45
   356
			}
slouken@74
   357
			else
slouken@45
   358
			{
slouken@74
   359
				if ( !SDL_RWread( src, ptr, bytesperline, 1 ) )
slouken@45
   360
				{
slouken@74
   361
					error="error reading BODY chunk";
slouken@45
   362
					goto done;
slouken@45
   363
				}
slouken@45
   364
			}
slouken@45
   365
		}
slouken@74
   366
slouken@74
   367
		/* One line has been read, store it ! */
slouken@45
   368
slouken@45
   369
		ptr = Image->pixels;
slouken@96
   370
		if ( nbplanes==24 || flagHAM==1 )
slouken@74
   371
			ptr += h * width * 3;
slouken@74
   372
		else
slouken@74
   373
			ptr += h * width;
slouken@74
   374
slouken@50
   375
		if ( pbm )                 /* File format : 'Packed Bitmap' */
slouken@45
   376
		{
slouken@45
   377
		   memcpy( ptr, MiniBuf, width );
slouken@45
   378
		}
slouken@50
   379
		else		/* We have to un-interlace the bits ! */
slouken@45
   380
		{
slouken@96
   381
			if ( nbplanes!=24 && flagHAM==0 )
slouken@45
   382
			{
slouken@74
   383
				size = ( width + 7 ) / 8;
slouken@74
   384
slouken@74
   385
				for ( i=0; i < size; i++ )
slouken@45
   386
				{
slouken@74
   387
					memset( ptr, 0, 8 );
slouken@74
   388
slouken@251
   389
					for ( plane=0; plane < (nbplanes + stencil); plane++ )
slouken@74
   390
					{
slouken@74
   391
						color = *( MiniBuf + i + ( plane * bytesperline ) );
slouken@74
   392
						msk = 0x80;
slouken@74
   393
slouken@74
   394
						for ( j=0; j<8; j++ )
slouken@74
   395
						{
slouken@74
   396
							if ( ( plane + j ) <= 7 ) ptr[j] |= (Uint8)( color & msk ) >> ( 7 - plane - j );
slouken@74
   397
							else 	                    ptr[j] |= (Uint8)( color & msk ) << ( plane + j - 7 );
slouken@74
   398
slouken@74
   399
							msk >>= 1;
slouken@74
   400
						}
slouken@74
   401
					}
slouken@74
   402
					ptr += 8;
slouken@74
   403
				}
slouken@74
   404
			}
slouken@74
   405
			else
slouken@74
   406
			{
slouken@96
   407
				Uint32 finalcolor = 0;
slouken@74
   408
				size = ( width + 7 ) / 8;
slouken@74
   409
				/* 24 bitplanes ILBM : R0...R7,G0...G7,B0...B7 */
slouken@96
   410
				/* or HAM (6 bitplanes) or HAM8 (8 bitplanes) modes */
slouken@74
   411
				for ( i=0; i<width; i=i+8 )
slouken@74
   412
				{
slouken@74
   413
					Uint8 maskBit = 0x80;
slouken@45
   414
					for ( j=0; j<8; j++ )
slouken@45
   415
					{
slouken@96
   416
						Uint32 pixelcolor = 0;
slouken@96
   417
						Uint32 maskColor = 1;
slouken@74
   418
						Uint8 dataBody;
slouken@74
   419
						for ( plane=0; plane < nbplanes; plane++ )
slouken@74
   420
						{
slouken@74
   421
							dataBody = MiniBuf[ plane*size+i/8 ];
slouken@74
   422
							if ( dataBody&maskBit )
slouken@96
   423
								pixelcolor = pixelcolor | maskColor;
slouken@96
   424
							maskColor = maskColor<<1;
slouken@96
   425
						}
slouken@96
   426
						/* HAM : 12 bits RGB image (4 bits per color component) */
slouken@96
   427
						/* HAM8 : 18 bits RGB image (6 bits per color component) */
slouken@96
   428
						if ( flagHAM )
slouken@96
   429
						{
slouken@96
   430
							switch( pixelcolor>>(nbplanes-2) )
slouken@96
   431
							{
slouken@96
   432
								case 0: /* take direct color from palette */
slouken@96
   433
									finalcolor = colormap[ pixelcolor*3 ] + (colormap[ pixelcolor*3+1 ]<<8) + (colormap[ pixelcolor*3+2 ]<<16);
slouken@96
   434
									break;
slouken@96
   435
								case 1: /* modify only blue component */
slouken@96
   436
									finalcolor = finalcolor&0x00FFFF;
slouken@96
   437
									finalcolor = finalcolor | (pixelcolor<<(16+(10-nbplanes)));
slouken@96
   438
									break;
slouken@96
   439
								case 2: /* modify only red component */
slouken@96
   440
									finalcolor = finalcolor&0xFFFF00;
slouken@96
   441
									finalcolor = finalcolor | pixelcolor<<(10-nbplanes);
slouken@96
   442
									break;
slouken@96
   443
								case 3: /* modify only green component */
slouken@96
   444
									finalcolor = finalcolor&0xFF00FF;
slouken@96
   445
									finalcolor = finalcolor | (pixelcolor<<(8+(10-nbplanes)));
slouken@96
   446
									break;
slouken@96
   447
							}
slouken@96
   448
						}
slouken@96
   449
						else
slouken@96
   450
						{
slouken@96
   451
							finalcolor = pixelcolor;
slouken@74
   452
						}
slouken@74
   453
						if ( SDL_BYTEORDER == SDL_LIL_ENDIAN )
slouken@74
   454
						{
slouken@139
   455
							*ptr++ = (Uint8)(finalcolor>>16);
slouken@139
   456
							*ptr++ = (Uint8)(finalcolor>>8);
slouken@139
   457
							*ptr++ = (Uint8)(finalcolor);
slouken@74
   458
						}
slouken@74
   459
						else
slouken@74
   460
						{
slouken@139
   461
							*ptr++ = (Uint8)(finalcolor);
slouken@139
   462
							*ptr++ = (Uint8)(finalcolor>>8);
slouken@139
   463
							*ptr++ = (Uint8)(finalcolor>>16);
slouken@74
   464
						}
slouken@74
   465
slouken@74
   466
						maskBit = maskBit>>1;
slouken@45
   467
					}
slouken@45
   468
				}
slouken@45
   469
			}
slouken@45
   470
		}
slouken@45
   471
	}
slouken@45
   472
slouken@45
   473
done:
slouken@45
   474
slouken@45
   475
	if ( MiniBuf ) free( MiniBuf );
slouken@45
   476
slouken@74
   477
	if ( error )
slouken@45
   478
	{
slouken@236
   479
		SDL_RWseek(src, start, RW_SEEK_SET);
slouken@118
   480
		if ( Image ) {
slouken@118
   481
			SDL_FreeSurface( Image );
slouken@118
   482
			Image = NULL;
slouken@118
   483
		}
slouken@45
   484
		IMG_SetError( error );
slouken@45
   485
	}
slouken@45
   486
slouken@45
   487
	return( Image );
slouken@45
   488
}
slouken@45
   489
slouken@45
   490
#else /* LOAD_LBM */
slouken@45
   491
slouken@45
   492
/* See if an image is contained in a data source */
slouken@45
   493
int IMG_isLBM(SDL_RWops *src)
slouken@45
   494
{
slouken@45
   495
	return(0);
slouken@45
   496
}
slouken@45
   497
slouken@45
   498
/* Load an IFF type image from an SDL datasource */
slouken@45
   499
SDL_Surface *IMG_LoadLBM_RW(SDL_RWops *src)
slouken@45
   500
{
slouken@45
   501
	return(NULL);
slouken@45
   502
}
slouken@45
   503
slouken@45
   504
#endif /* LOAD_LBM */