IMG_lbm.c
author Sam Lantinga <slouken@libsdl.org>
Sun, 15 Jun 2014 13:16:42 -0700
changeset 451 48116d511e5d
parent 415 1700d607fce3
child 481 e77ad79ab3e0
permissions -rw-r--r--
Fixed format warnings: format not a string literal and no format arguments
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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 ( SDL_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 ( !SDL_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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    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 = (Uint8 *)SDL_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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    }
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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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    if ( bmhd.mask & 2 )               /* There is a transparent color */
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        SDL_SetColorKey( Image, SDL_TRUE, bmhd.tcolor );
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    /* Update palette informations */
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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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        for ( i=0; i<nbcolors; i++ )
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        {
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            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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        /* Amiga EHB mode (Extra-Half-Bright) */
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        /* 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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        if ( (nbcolors==32 || flagEHB ) && (1<<bmhd.planes)==64 )
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        {
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   281
            nbcolors = 64;
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            ptr = &colormap[0];
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            for ( i=32; i<64; i++ )
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   284
            {
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   285
                Image->format->palette->colors[i].r = (*ptr++)/2;
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   286
                Image->format->palette->colors[i].g = (*ptr++)/2;
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   287
                Image->format->palette->colors[i].b = (*ptr++)/2;
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   288
            }
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   289
        }
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   290
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   291
        /* If nbcolors < 2^nbplanes, repeat the colormap */
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   292
        /* This happens when pictures have a stencil mask */
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   293
        if ( nbrcolorsfinal > (1<<bmhd.planes) ) {
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   294
            nbrcolorsfinal = (1<<bmhd.planes);
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   295
        }
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   296
        for ( i=nbcolors; i < (Uint32)nbrcolorsfinal; i++ )
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   297
        {
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   298
            Image->format->palette->colors[i].r = Image->format->palette->colors[i%nbcolors].r;
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            Image->format->palette->colors[i].g = Image->format->palette->colors[i%nbcolors].g;
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   300
            Image->format->palette->colors[i].b = Image->format->palette->colors[i%nbcolors].b;
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   301
        }
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   302
        if ( !pbm )
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   303
            Image->format->palette->ncolors = nbrcolorsfinal;
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   304
    }
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   305
slouken@368
   306
    /* Get the bitmap */
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   307
slouken@368
   308
    for ( h=0; h < bmhd.h; h++ )
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   309
    {
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   310
        /* uncompress the datas of each planes */
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   311
slouken@368
   312
        for ( plane=0; plane < (nbplanes+stencil); plane++ )
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   313
        {
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   314
            ptr = MiniBuf + ( plane * bytesperline );
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   315
slouken@368
   316
            remainingbytes = bytesperline;
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   317
slouken@368
   318
            if ( bmhd.tcomp == 1 )      /* Datas are compressed */
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   319
            {
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   320
                do
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   321
                {
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   322
                    if ( !SDL_RWread( src, &count, 1, 1 ) )
slouken@368
   323
                    {
slouken@368
   324
                        error="error reading BODY chunk";
slouken@368
   325
                        goto done;
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   326
                    }
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   327
slouken@368
   328
                    if ( count & 0x80 )
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   329
                    {
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   330
                        count ^= 0xFF;
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   331
                        count += 2; /* now it */
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   332
slouken@368
   333
                        if ( ( count > remainingbytes ) || !SDL_RWread( src, &color, 1, 1 ) )
slouken@368
   334
                        {
slouken@368
   335
                            error="error reading BODY chunk";
slouken@368
   336
                            goto done;
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   337
                        }
slouken@368
   338
                        SDL_memset( ptr, color, count );
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   339
                    }
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   340
                    else
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   341
                    {
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   342
                        ++count;
slouken@45
   343
slouken@368
   344
                        if ( ( count > remainingbytes ) || !SDL_RWread( src, ptr, count, 1 ) )
slouken@368
   345
                        {
slouken@368
   346
                           error="error reading BODY chunk";
slouken@368
   347
                            goto done;
slouken@368
   348
                        }
slouken@368
   349
                    }
slouken@74
   350
slouken@368
   351
                    ptr += count;
slouken@368
   352
                    remainingbytes -= count;
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   353
slouken@368
   354
                } while ( remainingbytes > 0 );
slouken@368
   355
            }
slouken@368
   356
            else
slouken@368
   357
            {
slouken@368
   358
                if ( !SDL_RWread( src, ptr, bytesperline, 1 ) )
slouken@368
   359
                {
slouken@368
   360
                    error="error reading BODY chunk";
slouken@368
   361
                    goto done;
slouken@368
   362
                }
slouken@368
   363
            }
slouken@368
   364
        }
slouken@74
   365
slouken@368
   366
        /* One line has been read, store it ! */
slouken@45
   367
slouken@368
   368
        ptr = (Uint8 *)Image->pixels;
slouken@368
   369
        if ( nbplanes==24 || flagHAM==1 )
slouken@368
   370
            ptr += h * width * 3;
slouken@368
   371
        else
slouken@368
   372
            ptr += h * width;
slouken@74
   373
slouken@368
   374
        if ( pbm )                 /* File format : 'Packed Bitmap' */
slouken@368
   375
        {
slouken@415
   376
           SDL_memcpy( ptr, MiniBuf, width );
slouken@368
   377
        }
slouken@368
   378
        else        /* We have to un-interlace the bits ! */
slouken@368
   379
        {
slouken@368
   380
            if ( nbplanes!=24 && flagHAM==0 )
slouken@368
   381
            {
slouken@368
   382
                size = ( width + 7 ) / 8;
slouken@74
   383
slouken@368
   384
                for ( i=0; i < size; i++ )
slouken@368
   385
                {
slouken@368
   386
                    memset( ptr, 0, 8 );
slouken@74
   387
slouken@368
   388
                    for ( plane=0; plane < (nbplanes + stencil); plane++ )
slouken@368
   389
                    {
slouken@368
   390
                        color = *( MiniBuf + i + ( plane * bytesperline ) );
slouken@368
   391
                        msk = 0x80;
slouken@74
   392
slouken@368
   393
                        for ( j=0; j<8; j++ )
slouken@368
   394
                        {
slouken@368
   395
                            if ( ( plane + j ) <= 7 ) ptr[j] |= (Uint8)( color & msk ) >> ( 7 - plane - j );
slouken@368
   396
                            else                        ptr[j] |= (Uint8)( color & msk ) << ( plane + j - 7 );
slouken@74
   397
slouken@368
   398
                            msk >>= 1;
slouken@368
   399
                        }
slouken@368
   400
                    }
slouken@368
   401
                    ptr += 8;
slouken@368
   402
                }
slouken@368
   403
            }
slouken@368
   404
            else
slouken@368
   405
            {
slouken@368
   406
                Uint32 finalcolor = 0;
slouken@368
   407
                size = ( width + 7 ) / 8;
slouken@368
   408
                /* 24 bitplanes ILBM : R0...R7,G0...G7,B0...B7 */
slouken@368
   409
                /* or HAM (6 bitplanes) or HAM8 (8 bitplanes) modes */
slouken@368
   410
                for ( i=0; i<width; i=i+8 )
slouken@368
   411
                {
slouken@368
   412
                    Uint8 maskBit = 0x80;
slouken@368
   413
                    for ( j=0; j<8; j++ )
slouken@368
   414
                    {
slouken@368
   415
                        Uint32 pixelcolor = 0;
slouken@368
   416
                        Uint32 maskColor = 1;
slouken@368
   417
                        Uint8 dataBody;
slouken@368
   418
                        for ( plane=0; plane < nbplanes; plane++ )
slouken@368
   419
                        {
slouken@368
   420
                            dataBody = MiniBuf[ plane*size+i/8 ];
slouken@368
   421
                            if ( dataBody&maskBit )
slouken@368
   422
                                pixelcolor = pixelcolor | maskColor;
slouken@368
   423
                            maskColor = maskColor<<1;
slouken@368
   424
                        }
slouken@368
   425
                        /* HAM : 12 bits RGB image (4 bits per color component) */
slouken@368
   426
                        /* HAM8 : 18 bits RGB image (6 bits per color component) */
slouken@368
   427
                        if ( flagHAM )
slouken@368
   428
                        {
slouken@368
   429
                            switch( pixelcolor>>(nbplanes-2) )
slouken@368
   430
                            {
slouken@368
   431
                                case 0: /* take direct color from palette */
slouken@368
   432
                                    finalcolor = colormap[ pixelcolor*3 ] + (colormap[ pixelcolor*3+1 ]<<8) + (colormap[ pixelcolor*3+2 ]<<16);
slouken@368
   433
                                    break;
slouken@368
   434
                                case 1: /* modify only blue component */
slouken@368
   435
                                    finalcolor = finalcolor&0x00FFFF;
slouken@368
   436
                                    finalcolor = finalcolor | (pixelcolor<<(16+(10-nbplanes)));
slouken@368
   437
                                    break;
slouken@368
   438
                                case 2: /* modify only red component */
slouken@368
   439
                                    finalcolor = finalcolor&0xFFFF00;
slouken@368
   440
                                    finalcolor = finalcolor | pixelcolor<<(10-nbplanes);
slouken@368
   441
                                    break;
slouken@368
   442
                                case 3: /* modify only green component */
slouken@368
   443
                                    finalcolor = finalcolor&0xFF00FF;
slouken@368
   444
                                    finalcolor = finalcolor | (pixelcolor<<(8+(10-nbplanes)));
slouken@368
   445
                                    break;
slouken@368
   446
                            }
slouken@368
   447
                        }
slouken@368
   448
                        else
slouken@368
   449
                        {
slouken@368
   450
                            finalcolor = pixelcolor;
slouken@368
   451
                        }
aschiffler@343
   452
#if SDL_BYTEORDER == SDL_LIL_ENDIAN
slouken@368
   453
                            *ptr++ = (Uint8)(finalcolor>>16);
slouken@368
   454
                            *ptr++ = (Uint8)(finalcolor>>8);
slouken@368
   455
                            *ptr++ = (Uint8)(finalcolor);
aschiffler@343
   456
#else
slouken@368
   457
                            *ptr++ = (Uint8)(finalcolor);
slouken@368
   458
                            *ptr++ = (Uint8)(finalcolor>>8);
slouken@368
   459
                            *ptr++ = (Uint8)(finalcolor>>16);
aschiffler@343
   460
#endif
slouken@368
   461
                        maskBit = maskBit>>1;
slouken@368
   462
                    }
slouken@368
   463
                }
slouken@368
   464
            }
slouken@368
   465
        }
slouken@368
   466
    }
slouken@45
   467
slouken@45
   468
done:
slouken@45
   469
slouken@368
   470
    if ( MiniBuf ) SDL_free( MiniBuf );
slouken@45
   471
slouken@368
   472
    if ( error )
slouken@368
   473
    {
slouken@368
   474
        SDL_RWseek(src, start, RW_SEEK_SET);
slouken@368
   475
        if ( Image ) {
slouken@368
   476
            SDL_FreeSurface( Image );
slouken@368
   477
            Image = NULL;
slouken@368
   478
        }
slouken@451
   479
        IMG_SetError( "%s", error );
slouken@368
   480
    }
slouken@45
   481
slouken@368
   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@368
   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@368
   496
    return(NULL);
slouken@45
   497
}
slouken@45
   498
slouken@45
   499
#endif /* LOAD_LBM */