IMG_lbm.c
author Sam Lantinga <slouken@libsdl.org>
Fri, 15 Feb 2013 14:47:06 -0800
changeset 347 ad5034cad524
parent 343 5bf0f0d6a74e
child 367 b2aa197f6774
permissions -rw-r--r--
Updated copyright year
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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) 1997-2013 Sam Lantinga <slouken@libsdl.org>
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  This software is provided 'as-is', without any express or implied
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  warranty.  In no event will the authors be held liable for any damages
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  arising from the use of this software.
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  Permission is granted to anyone to use this software for any purpose,
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  including commercial applications, and to alter it and redistribute it
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  freely, subject to the following restrictions:
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  1. The origin of this software must not be misrepresented; you must not
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     claim that you wrote the original software. If you use this software
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     in a product, an acknowledgment in the product documentation would be
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     appreciated but is not required.
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  2. Altered source versions must be plainly marked as such, and must not be
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     misrepresented as being the original software.
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  3. This notice may not be removed or altered from any source distribution.
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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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	Sint64 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 ( !SDL_memcmp( magic, "FORM", 4 ) &&
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			( !SDL_memcmp( magic + 8, "PBM ", 4 ) ||
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			  !SDL_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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	Sint64 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 ( !SDL_memcmp( id, "PBM ", 4 ) ) pbm = 1;
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	else if ( SDL_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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	SDL_memset( &bmhd, 0, sizeof( BMHD ) );
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	flagHAM = 0;
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	flagEHB = 0;
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	while ( SDL_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 ( !SDL_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 ( !SDL_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 ( SDL_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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   230
	bytesperline = ( ( bmhd.w + 15 ) / 16 ) * 2;
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	nbplanes = bmhd.planes;
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   233
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   234
	if ( pbm )                         /* File format : 'Packed Bitmap' */
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   235
	{
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   236
		bytesperline *= 8;
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   237
		nbplanes = 1;
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	}
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   240
	stencil = (bmhd.mask & 1);   /* There is a mask ( 'stencil' ) */
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   241
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   242
	/* Allocate memory for a temporary buffer ( used for
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   243
           decompression/deinterleaving ) */
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   244
aschiffler@343
   245
	MiniBuf = (Uint8 *)SDL_malloc( bytesperline * (nbplanes + stencil) );
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   246
	if ( MiniBuf == NULL )
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   247
	{
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   248
		error="no enough memory for temporary buffer";
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   249
		goto done;
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   250
	}
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   251
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   252
	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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   253
	   goto done;
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   254
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   255
	if ( bmhd.mask & 2 )               /* There is a transparent color */
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   256
		SDL_SetColorKey( Image, SDL_TRUE, bmhd.tcolor );
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   257
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   258
	/* Update palette informations */
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   259
slouken@74
   260
	/* There is no palette in 24 bits ILBM file */
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   261
	if ( nbcolors>0 && flagHAM==0 )
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   262
	{
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   263
		/* FIXME: Should this include the stencil? See comment below */
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   264
		int nbrcolorsfinal = 1 << (nbplanes + stencil);
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   265
		ptr = &colormap[0];
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   266
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   267
		for ( i=0; i<nbcolors; i++ )
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   268
		{
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   269
			Image->format->palette->colors[i].r = *ptr++;
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   270
			Image->format->palette->colors[i].g = *ptr++;
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   271
			Image->format->palette->colors[i].b = *ptr++;
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   272
		}
slouken@96
   273
slouken@96
   274
		/* Amiga EHB mode (Extra-Half-Bright) */
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   275
		/* 6 bitplanes mode with a 32 colors palette */
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   276
		/* The 32 last colors are the same but divided by 2 */
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   277
		/* Some Amiga pictures save 64 colors with 32 last wrong colors, */
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   278
		/* they shouldn't !, and here we overwrite these 32 bad colors. */
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   279
		if ( (nbcolors==32 || flagEHB ) && (1<<bmhd.planes)==64 )
slouken@96
   280
		{
slouken@99
   281
			nbcolors = 64;
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   282
			ptr = &colormap[0];
slouken@96
   283
			for ( i=32; i<64; i++ )
slouken@96
   284
			{
slouken@96
   285
				Image->format->palette->colors[i].r = (*ptr++)/2;
slouken@96
   286
				Image->format->palette->colors[i].g = (*ptr++)/2;
slouken@96
   287
				Image->format->palette->colors[i].b = (*ptr++)/2;
slouken@96
   288
			}
slouken@96
   289
		}
slouken@99
   290
slouken@99
   291
		/* If nbcolors < 2^nbplanes, repeat the colormap */
slouken@99
   292
		/* This happens when pictures have a stencil mask */
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   293
		if ( nbrcolorsfinal > (1<<bmhd.planes) ) {
slouken@103
   294
			nbrcolorsfinal = (1<<bmhd.planes);
slouken@103
   295
		}
slouken@104
   296
		for ( i=nbcolors; i < (Uint32)nbrcolorsfinal; i++ )
slouken@99
   297
		{
slouken@99
   298
			Image->format->palette->colors[i].r = Image->format->palette->colors[i%nbcolors].r;
slouken@99
   299
			Image->format->palette->colors[i].g = Image->format->palette->colors[i%nbcolors].g;
slouken@99
   300
			Image->format->palette->colors[i].b = Image->format->palette->colors[i%nbcolors].b;
slouken@99
   301
		}
slouken@174
   302
		if ( !pbm )
slouken@174
   303
			Image->format->palette->ncolors = nbrcolorsfinal;
slouken@45
   304
	}
slouken@45
   305
slouken@50
   306
	/* Get the bitmap */
slouken@45
   307
slouken@45
   308
	for ( h=0; h < bmhd.h; h++ )
slouken@45
   309
	{
slouken@74
   310
		/* uncompress the datas of each planes */
slouken@74
   311
slouken@251
   312
		for ( plane=0; plane < (nbplanes+stencil); plane++ )
slouken@45
   313
		{
slouken@74
   314
			ptr = MiniBuf + ( plane * bytesperline );
slouken@74
   315
slouken@45
   316
			remainingbytes = bytesperline;
slouken@74
   317
slouken@50
   318
			if ( bmhd.tcomp == 1 )	    /* Datas are compressed */
slouken@45
   319
			{
slouken@74
   320
				do
slouken@45
   321
				{
slouken@74
   322
					if ( !SDL_RWread( src, &count, 1, 1 ) )
slouken@45
   323
					{
slouken@74
   324
						error="error reading BODY chunk";
slouken@45
   325
						goto done;
slouken@45
   326
					}
slouken@74
   327
slouken@45
   328
					if ( count & 0x80 )
slouken@45
   329
					{
slouken@74
   330
						count ^= 0xFF;
slouken@74
   331
						count += 2; /* now it */
slouken@74
   332
icculus@183
   333
						if ( ( count > remainingbytes ) || !SDL_RWread( src, &color, 1, 1 ) )
slouken@45
   334
						{
slouken@251
   335
							error="error reading BODY chunk";
slouken@45
   336
							goto done;
slouken@45
   337
						}
aschiffler@343
   338
						SDL_memset( ptr, color, count );
slouken@45
   339
					}
slouken@45
   340
					else
slouken@45
   341
					{
slouken@74
   342
						++count;
slouken@45
   343
icculus@183
   344
						if ( ( count > remainingbytes ) || !SDL_RWread( src, ptr, count, 1 ) )
slouken@45
   345
						{
slouken@45
   346
						   error="error reading BODY chunk";
slouken@45
   347
							goto done;
slouken@45
   348
						}
slouken@45
   349
					}
slouken@74
   350
slouken@45
   351
					ptr += count;
slouken@45
   352
					remainingbytes -= count;
slouken@74
   353
slouken@45
   354
				} while ( remainingbytes > 0 );
slouken@45
   355
			}
slouken@74
   356
			else
slouken@45
   357
			{
slouken@74
   358
				if ( !SDL_RWread( src, ptr, bytesperline, 1 ) )
slouken@45
   359
				{
slouken@74
   360
					error="error reading BODY chunk";
slouken@45
   361
					goto done;
slouken@45
   362
				}
slouken@45
   363
			}
slouken@45
   364
		}
slouken@74
   365
slouken@74
   366
		/* One line has been read, store it ! */
slouken@45
   367
aschiffler@343
   368
		ptr = (Uint8 *)Image->pixels;
slouken@96
   369
		if ( nbplanes==24 || flagHAM==1 )
slouken@74
   370
			ptr += h * width * 3;
slouken@74
   371
		else
slouken@74
   372
			ptr += h * width;
slouken@74
   373
slouken@50
   374
		if ( pbm )                 /* File format : 'Packed Bitmap' */
slouken@45
   375
		{
slouken@45
   376
		   memcpy( ptr, MiniBuf, width );
slouken@45
   377
		}
slouken@50
   378
		else		/* We have to un-interlace the bits ! */
slouken@45
   379
		{
slouken@96
   380
			if ( nbplanes!=24 && flagHAM==0 )
slouken@45
   381
			{
slouken@74
   382
				size = ( width + 7 ) / 8;
slouken@74
   383
slouken@74
   384
				for ( i=0; i < size; i++ )
slouken@45
   385
				{
slouken@74
   386
					memset( ptr, 0, 8 );
slouken@74
   387
slouken@251
   388
					for ( plane=0; plane < (nbplanes + stencil); plane++ )
slouken@74
   389
					{
slouken@74
   390
						color = *( MiniBuf + i + ( plane * bytesperline ) );
slouken@74
   391
						msk = 0x80;
slouken@74
   392
slouken@74
   393
						for ( j=0; j<8; j++ )
slouken@74
   394
						{
slouken@74
   395
							if ( ( plane + j ) <= 7 ) ptr[j] |= (Uint8)( color & msk ) >> ( 7 - plane - j );
slouken@74
   396
							else 	                    ptr[j] |= (Uint8)( color & msk ) << ( plane + j - 7 );
slouken@74
   397
slouken@74
   398
							msk >>= 1;
slouken@74
   399
						}
slouken@74
   400
					}
slouken@74
   401
					ptr += 8;
slouken@74
   402
				}
slouken@74
   403
			}
slouken@74
   404
			else
slouken@74
   405
			{
slouken@96
   406
				Uint32 finalcolor = 0;
slouken@74
   407
				size = ( width + 7 ) / 8;
slouken@74
   408
				/* 24 bitplanes ILBM : R0...R7,G0...G7,B0...B7 */
slouken@96
   409
				/* or HAM (6 bitplanes) or HAM8 (8 bitplanes) modes */
slouken@74
   410
				for ( i=0; i<width; i=i+8 )
slouken@74
   411
				{
slouken@74
   412
					Uint8 maskBit = 0x80;
slouken@45
   413
					for ( j=0; j<8; j++ )
slouken@45
   414
					{
slouken@96
   415
						Uint32 pixelcolor = 0;
slouken@96
   416
						Uint32 maskColor = 1;
slouken@74
   417
						Uint8 dataBody;
slouken@74
   418
						for ( plane=0; plane < nbplanes; plane++ )
slouken@74
   419
						{
slouken@74
   420
							dataBody = MiniBuf[ plane*size+i/8 ];
slouken@74
   421
							if ( dataBody&maskBit )
slouken@96
   422
								pixelcolor = pixelcolor | maskColor;
slouken@96
   423
							maskColor = maskColor<<1;
slouken@96
   424
						}
slouken@96
   425
						/* HAM : 12 bits RGB image (4 bits per color component) */
slouken@96
   426
						/* HAM8 : 18 bits RGB image (6 bits per color component) */
slouken@96
   427
						if ( flagHAM )
slouken@96
   428
						{
slouken@96
   429
							switch( pixelcolor>>(nbplanes-2) )
slouken@96
   430
							{
slouken@96
   431
								case 0: /* take direct color from palette */
slouken@96
   432
									finalcolor = colormap[ pixelcolor*3 ] + (colormap[ pixelcolor*3+1 ]<<8) + (colormap[ pixelcolor*3+2 ]<<16);
slouken@96
   433
									break;
slouken@96
   434
								case 1: /* modify only blue component */
slouken@96
   435
									finalcolor = finalcolor&0x00FFFF;
slouken@96
   436
									finalcolor = finalcolor | (pixelcolor<<(16+(10-nbplanes)));
slouken@96
   437
									break;
slouken@96
   438
								case 2: /* modify only red component */
slouken@96
   439
									finalcolor = finalcolor&0xFFFF00;
slouken@96
   440
									finalcolor = finalcolor | pixelcolor<<(10-nbplanes);
slouken@96
   441
									break;
slouken@96
   442
								case 3: /* modify only green component */
slouken@96
   443
									finalcolor = finalcolor&0xFF00FF;
slouken@96
   444
									finalcolor = finalcolor | (pixelcolor<<(8+(10-nbplanes)));
slouken@96
   445
									break;
slouken@96
   446
							}
slouken@96
   447
						}
slouken@96
   448
						else
slouken@96
   449
						{
slouken@96
   450
							finalcolor = pixelcolor;
slouken@74
   451
						}
aschiffler@343
   452
#if SDL_BYTEORDER == SDL_LIL_ENDIAN
slouken@139
   453
							*ptr++ = (Uint8)(finalcolor>>16);
slouken@139
   454
							*ptr++ = (Uint8)(finalcolor>>8);
slouken@139
   455
							*ptr++ = (Uint8)(finalcolor);
aschiffler@343
   456
#else
aschiffler@343
   457
						    *ptr++ = (Uint8)(finalcolor);
slouken@139
   458
							*ptr++ = (Uint8)(finalcolor>>8);
slouken@139
   459
							*ptr++ = (Uint8)(finalcolor>>16);
aschiffler@343
   460
#endif
slouken@74
   461
						maskBit = maskBit>>1;
slouken@45
   462
					}
slouken@45
   463
				}
slouken@45
   464
			}
slouken@45
   465
		}
slouken@45
   466
	}
slouken@45
   467
slouken@45
   468
done:
slouken@45
   469
slouken@45
   470
	if ( MiniBuf ) free( MiniBuf );
slouken@45
   471
slouken@74
   472
	if ( error )
slouken@45
   473
	{
slouken@236
   474
		SDL_RWseek(src, start, RW_SEEK_SET);
slouken@118
   475
		if ( Image ) {
slouken@118
   476
			SDL_FreeSurface( Image );
slouken@118
   477
			Image = NULL;
slouken@118
   478
		}
slouken@45
   479
		IMG_SetError( error );
slouken@45
   480
	}
slouken@45
   481
slouken@45
   482
	return( Image );
slouken@45
   483
}
slouken@45
   484
slouken@45
   485
#else /* LOAD_LBM */
slouken@45
   486
slouken@45
   487
/* See if an image is contained in a data source */
slouken@45
   488
int IMG_isLBM(SDL_RWops *src)
slouken@45
   489
{
slouken@45
   490
	return(0);
slouken@45
   491
}
slouken@45
   492
slouken@45
   493
/* Load an IFF type image from an SDL datasource */
slouken@45
   494
SDL_Surface *IMG_LoadLBM_RW(SDL_RWops *src)
slouken@45
   495
{
slouken@45
   496
	return(NULL);
slouken@45
   497
}
slouken@45
   498
slouken@45
   499
#endif /* LOAD_LBM */