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src/Source/FreeImage/PluginIFF.cpp  view on Meta::CPAN

// ==========================================================
// Deluxe Paint Loader
//
// Design and implementation by
// - Floris van den Berg (flvdberg@wxs.nl)
// - Mark Sibly (marksibly@blitzbasic.com)
// - Aaron Shumate (trek@startreker.com)
// - Hervé Drolon (drolon@infonie.fr)
//
// This file is part of FreeImage 3
//
// COVERED CODE IS PROVIDED UNDER THIS LICENSE ON AN "AS IS" BASIS, WITHOUT WARRANTY
// OF ANY KIND, EITHER EXPRESSED OR IMPLIED, INCLUDING, WITHOUT LIMITATION, WARRANTIES
// THAT THE COVERED CODE IS FREE OF DEFECTS, MERCHANTABLE, FIT FOR A PARTICULAR PURPOSE
// OR NON-INFRINGING. THE ENTIRE RISK AS TO THE QUALITY AND PERFORMANCE OF THE COVERED
// CODE IS WITH YOU. SHOULD ANY COVERED CODE PROVE DEFECTIVE IN ANY RESPECT, YOU (NOT
// THE INITIAL DEVELOPER OR ANY OTHER CONTRIBUTOR) ASSUME THE COST OF ANY NECESSARY
// SERVICING, REPAIR OR CORRECTION. THIS DISCLAIMER OF WARRANTY CONSTITUTES AN ESSENTIAL
// PART OF THIS LICENSE. NO USE OF ANY COVERED CODE IS AUTHORIZED HEREUNDER EXCEPT UNDER
// THIS DISCLAIMER.
//
// Use at your own risk!
// ==========================================================

#include "FreeImage.h"
#include "Utilities.h"

// ----------------------------------------------------------
//  Internal typedefs and structures
// ----------------------------------------------------------

#ifdef _WIN32
#pragma pack(push, 1)
#else
#pragma pack(1)
#endif

typedef struct {
    WORD w, h;                    /* raster width & height in pixels */
    WORD x, y;                    /* position for this image */
    BYTE nPlanes;                 /* # source bitplanes */
    BYTE masking;                 /* masking technique */
    BYTE compression;             /* compression algorithm */
    BYTE pad1;                    /* UNUSED.  For consistency, put 0 here.*/
    WORD transparentColor;        /* transparent "color number" */
    BYTE xAspect, yAspect;        /* aspect ratio, a rational number x/y */
    WORD pageWidth, pageHeight;   /* source "page" size in pixels */
} BMHD;

#ifdef _WIN32
#pragma pack(pop)
#else
#pragma pack()
#endif

#ifndef FREEIMAGE_BIGENDIAN
static void
SwapHeader(BMHD *header) {
	SwapShort(&header->w);
	SwapShort(&header->h);
	SwapShort(&header->x);
	SwapShort(&header->y);
	SwapShort(&header->transparentColor);
	SwapShort(&header->pageWidth);
	SwapShort(&header->pageHeight);
}
#endif

// ----------------------------------------------------------

/* IFF chunk IDs */

typedef DWORD IFF_ID;

#define MAKE_ID(a, b, c, d)         ((IFF_ID)(a)<<24 | (IFF_ID)(b)<<16 | (IFF_ID)(c)<<8 | (IFF_ID)(d))

#define ID_FORM     MAKE_ID('F', 'O', 'R', 'M')     /* EA IFF 85 group identifier */
#define ID_CAT      MAKE_ID('C', 'A', 'T', ' ')     /* EA IFF 85 group identifier */
#define ID_LIST     MAKE_ID('L', 'I', 'S', 'T')     /* EA IFF 85 group identifier */
#define ID_PROP     MAKE_ID('P', 'R', 'O', 'P')     /* EA IFF 85 group identifier */
#define ID_END      MAKE_ID('E', 'N', 'D', ' ')     /* unofficial END-of-FORM identifier (see Amiga RKM Devices Ed.3 page 376) */

#define ID_ILBM     MAKE_ID('I', 'L', 'B', 'M')     /* EA IFF 85 raster bitmap form */
#define ID_DEEP     MAKE_ID('D', 'E', 'E', 'P')     /* Chunky pixel image files (Used in TV Paint) */
#define ID_RGB8     MAKE_ID('R', 'G', 'B', '8')     /* RGB image forms, Turbo Silver (Impulse) */
#define ID_RGBN     MAKE_ID('R', 'G', 'B', 'N')     /* RGB image forms, Turbo Silver (Impulse) */
#define ID_PBM      MAKE_ID('P', 'B', 'M', ' ')     /* 256-color chunky format (DPaint 2 ?) */
#define ID_ACBM     MAKE_ID('A', 'C', 'B', 'M')     /* Amiga Contiguous Bitmap (AmigaBasic) */
/* generic */
#define ID_FVER     MAKE_ID('F', 'V', 'E', 'R')     /* AmigaOS version string */
#define ID_JUNK     MAKE_ID('J', 'U', 'N', 'K')     /* always ignore this chunk */
#define ID_ANNO     MAKE_ID('A', 'N', 'N', 'O')     /* EA IFF 85 Generic Annotation chunk */
#define ID_AUTH     MAKE_ID('A', 'U', 'T', 'H')     /* EA IFF 85 Generic Author chunk */
#define ID_CHRS     MAKE_ID('C', 'H', 'R', 'S')     /* EA IFF 85 Generic character string chunk */
#define ID_NAME     MAKE_ID('N', 'A', 'M', 'E')     /* EA IFF 85 Generic Name of art, music, etc. chunk */
#define ID_TEXT     MAKE_ID('T', 'E', 'X', 'T')     /* EA IFF 85 Generic unformatted ASCII text chunk */
#define ID_copy     MAKE_ID('(', 'c', ')', ' ')     /* EA IFF 85 Generic Copyright text chunk */
/* ILBM chunks */
#define ID_BMHD     MAKE_ID('B', 'M', 'H', 'D')     /* ILBM BitmapHeader */
#define ID_CMAP     MAKE_ID('C', 'M', 'A', 'P')     /* ILBM 8bit RGB colormap */
#define ID_GRAB     MAKE_ID('G', 'R', 'A', 'B')     /* ILBM "hotspot" coordiantes */
#define ID_DEST     MAKE_ID('D', 'E', 'S', 'T')     /* ILBM destination image info */
#define ID_SPRT     MAKE_ID('S', 'P', 'R', 'T')     /* ILBM sprite identifier */
#define ID_CAMG     MAKE_ID('C', 'A', 'M', 'G')     /* Amiga viewportmodes */
#define ID_BODY     MAKE_ID('B', 'O', 'D', 'Y')     /* ILBM image data */
#define ID_CRNG     MAKE_ID('C', 'R', 'N', 'G')     /* color cycling */
#define ID_CCRT     MAKE_ID('C', 'C', 'R', 'T')     /* color cycling */
#define ID_CLUT     MAKE_ID('C', 'L', 'U', 'T')     /* Color Lookup Table chunk */
#define ID_DPI      MAKE_ID('D', 'P', 'I', ' ')     /* Dots per inch chunk */
#define ID_DPPV     MAKE_ID('D', 'P', 'P', 'V')     /* DPaint perspective chunk (EA) */
#define ID_DRNG     MAKE_ID('D', 'R', 'N', 'G')     /* DPaint IV enhanced color cycle chunk (EA) */
#define ID_EPSF     MAKE_ID('E', 'P', 'S', 'F')     /* Encapsulated Postscript chunk */
#define ID_CMYK     MAKE_ID('C', 'M', 'Y', 'K')     /* Cyan, Magenta, Yellow, & Black color map (Soft-Logik) */
#define ID_CNAM     MAKE_ID('C', 'N', 'A', 'M')     /* Color naming chunk (Soft-Logik) */
#define ID_PCHG     MAKE_ID('P', 'C', 'H', 'G')     /* Line by line palette control information (Sebastiano Vigna) */
#define ID_PRVW     MAKE_ID('P', 'R', 'V', 'W')     /* A mini duplicate ILBM used for preview (Gary Bonham) */
#define ID_XBMI     MAKE_ID('X', 'B', 'M', 'I')     /* eXtended BitMap Information (Soft-Logik) */
#define ID_CTBL     MAKE_ID('C', 'T', 'B', 'L')     /* Newtek Dynamic Ham color chunk */
#define ID_DYCP     MAKE_ID('D', 'Y', 'C', 'P')     /* Newtek Dynamic Ham chunk */
#define ID_SHAM     MAKE_ID('S', 'H', 'A', 'M')     /* Sliced HAM color chunk */
#define ID_ABIT     MAKE_ID('A', 'B', 'I', 'T')     /* ACBM body chunk */
#define ID_DCOL     MAKE_ID('D', 'C', 'O', 'L')     /* unofficial direct color */