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/******************************************************************************
* In order to make life a little bit easier when using the GIF file format, *
* this library was written, and which does all the dirty work... *
* *
* Written by Gershon Elber, Jun. 1989 *
* Hacks by Eric S. Raymond, Sep. 1992 *
*******************************************************************************
* History: *
* 14 Jun 89 - Version 1.0 by Gershon Elber. *
* 3 Sep 90 - Version 1.1 by Gershon Elber (Support for Gif89, Unique names) *
* 15 Sep 90 - Version 2.0 by Eric S. Raymond (Changes to suoport GIF slurp) *
* 26 Jun 96 - Version 3.0 by Eric S. Raymond (Full GIF89 support) *
* 17 Dec 98 - Version 4.0 by Toshio Kuratomi (Fix extension writing code) *
******************************************************************************/
#ifndef _GIF_LIB_H
#define _GIF_LIB_H
# include <sioGeneral.h>
# include <bmcolor.h>
/*************************/
/*************************/
/*************************/
# define EGifCloseFile bm_EGifCloseFile
# define EGifOpenFileHandle bm_EGifOpenFileHandle
# define EGifPutComment bm_EGifPutComment
# define EGifPutExtension bm_EGifPutExtension
# define EGifPutExtensionFirst bm_EGifPutExtensionFirst
# define EGifPutExtensionLast bm_EGifPutExtensionLast
# define EGifPutExtensionNext bm_EGifPutExtensionNext
# define EGifPutImageDesc bm_EGifPutImageDesc
# define EGifPutScreenDesc bm_EGifPutScreenDesc
# define EGifSpew bm_EGifSpew
# define DGifCloseFile bm_DGifCloseFile
# define DGifOpenFileHandle bm_DGifOpenFileHandle
# define DGifGetExtension bm_DGifGetExtension
# define DGifGetExtensionNext bm_DGifGetExtensionNext
# define DGifGetImageDesc bm_DGifGetImageDesc
# define bmGifGetRecordType bm_DGifGetRecordType
# define _GifError bm__GifError
/*************************/
/*************************/
/*************************/
#define GIF_ERROR 0
#define GIF_OK 1
#define GIF87_STAMP "GIF87a" /* First chars in file - GIF stamp. */
#define GIF89_STAMP "GIF89a" /* First chars in file - GIF stamp. */
typedef unsigned char GifPixelType;
typedef unsigned char GifByteType;
typedef struct GifColorMap
{
int gcmColorCount;
int gcmBitsPerPixel;
RGB8Color gcmColors[256];
} GifColorMap;
typedef struct GifImageDesc
{
int Left;
int Top;
int Width;
int Height;
int Interlace; /* Sequential/Interlaced lines */
GifColorMap gidImageColorMap;
} GifImageDesc;
typedef struct GifScreenDescriptor
{
int gsdScreenWide;
int gsdScreenHigh;
int gsdScreenBitsPerPixel;
unsigned char gsdPackedFields;
int gsdScreenBackgroundColor;
int gsdScreenAspectRatio;
GifColorMap gsdScreenColorMap;
} GifScreenDescriptor;
typedef struct GifFileType
{
char gftVersionString[6+1];
GifScreenDescriptor gftScreenDescriptor;
GifImageDesc gftCurrentImageDescriptor;
/**/
SimpleOutputStream * gftSos;
SimpleOutputStream * gftSosBlocked;
SimpleOutputStream * gftSosLzw;
SimpleInputStream * gftSis;
SimpleInputStream * gftSisBlocked;
SimpleInputStream * gftSisLzw;
long gftPixelCount;
/************************************/
/* Number of pixels that has not */
/* yet been written to the current */
/* image. */
/* OR */
/* Number of pixels that has not */
/* yet been read from the current */
/* image. */
/************************************/
} GifFileType;
typedef enum GifRecordType
{
UNDEFINED_RECORD_TYPE,
SCREEN_DESC_RECORD_TYPE,
IMAGE_DESC_RECORD_TYPE, /* Begin with ',' */
EXTENSION_RECORD_TYPE, /* Begin with '!' */
TERMINATE_RECORD_TYPE /* Begin with ';' */
} GifRecordType;
extern void bmGifInitGifColorMap( GifColorMap * gcm );
/******************************************************************************
* GIF89 extension function codes *
******************************************************************************/
#define COMMENT_EXT_FUNC_CODE 0xfe /* comment */
#define GRAPHICS_EXT_FUNC_CODE 0xf9 /* graphics control */
#define PLAINTEXT_EXT_FUNC_CODE 0x01 /* plaintext */
#define APPLICATION_EXT_FUNC_CODE 0xff /* application block */
/******************************************************************************
* O.K., here are the routines one can access in order to encode GIF file: *
* (GIF_LIB file EGIF_LIB.C). *
******************************************************************************/
extern GifFileType *EGifOpenFileHandle( SimpleOutputStream * sos );
extern void bmGifSetVersion( GifFileType * gft,
const char * version );
int EGifPutScreenDesc(GifFileType *GifFile,
int GifWidth, int GifHeight, int GifColorRes, int GifBackGround,
const GifColorMap *gcm);
int EGifPutImageDesc(GifFileType *GifFile,
int GifLeft, int GifTop, int Width, int GifHeight, int GifInterlace,
const GifColorMap * gcm);
int bmGifPutPixels(GifFileType *GifFile, const GifPixelType *GifLine, int GifLineLen);
int EGifPutComment(GifFileType *GifFile, const char *GifComment);
int EGifPutExtensionFirst(GifFileType *GifFile, int GifExtCode, int GifExtLen,
const void * GifExtension);
int EGifPutExtensionNext(GifFileType *GifFile, int GifExtCode, int GifExtLen,
const void * GifExtension);
int EGifPutExtensionLast(GifFileType *GifFile, int GifExtCode, int GifExtLen,
const void * GifExtension);
int EGifPutExtension(GifFileType *GifFile, int GifExtCode, int GifExtLen,
const void * GifExtension);
int EGifCloseFile(GifFileType *GifFile);
#define E_GIF_ERR_OPEN_FAILED 1 /* And EGif possible errors. */
#define E_GIF_ERR_WRITE_FAILED 2
#define E_GIF_ERR_HAS_SCRN_DSCR 3
#define E_GIF_ERR_HAS_IMAG_DSCR 4
#define E_GIF_ERR_NO_COLOR_MAP 5
#define E_GIF_ERR_DATA_TOO_BIG 6
#define E_GIF_ERR_NOT_ENOUGH_MEM 7
#define E_GIF_ERR_DISK_IS_FULL 8
#define E_GIF_ERR_CLOSE_FAILED 9
#define E_GIF_ERR_NOT_WRITEABLE 10
/******************************************************************************
* O.K., here are the routines one can access in order to decode GIF file: *
* (GIF_LIB file DGIF_LIB.C). *
******************************************************************************/
GifFileType *DGifOpenFileHandle( SimpleInputStream * sis );
int bmGifGetRecordType(GifFileType *GifFile, GifRecordType *GifType);
int DGifGetImageDesc(GifFileType *GifFile);
extern int bmGifGetPixels( GifFileType * GifFile,
GifPixelType * GifLine,
int GifLineLen );
int DGifGetComment(GifFileType *GifFile, char *GifComment);
int DGifCloseFile(GifFileType *GifFile);
extern int DGifGetExtension( GifFileType * GifFile,
int * ExtCode,
GifByteType Extension[256] );
extern int DGifGetExtensionNext( GifFileType * GifFile,
int * pGot,
GifByteType Extension[256] );
#define D_GIF_ERR_OPEN_FAILED 101 /* And DGif possible errors. */
#define D_GIF_ERR_READ_FAILED 102
#define D_GIF_ERR_NOT_GIF_FILE 103
#define D_GIF_ERR_NO_SCRN_DSCR 104
#define D_GIF_ERR_NO_IMAG_DSCR 105
#define D_GIF_ERR_NO_COLOR_MAP 106
#define D_GIF_ERR_WRONG_RECORD 107
#define D_GIF_ERR_DATA_TOO_BIG 108
#define D_GIF_ERR_NOT_ENOUGH_MEM 109
#define D_GIF_ERR_CLOSE_FAILED 110
#define D_GIF_ERR_NOT_READABLE 111
#define D_GIF_ERR_IMAGE_DEFECT 112
#define D_GIF_ERR_EOF_TOO_SOON 113
extern int _GifError;
#endif /* _GIF_LIB_H */
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