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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_ 1

#ifdef __cplusplus
extern "C" {
#endif /* __cplusplus */

#define GIF_LIB_VERSION " Version 4.1, "

#define GIF_ERROR 0
#define GIF_OK 1

#ifndef TRUE
#define TRUE 1
#endif /* TRUE */
#ifndef FALSE
#define FALSE 0
#endif /* FALSE */

#ifndef NULL
#define NULL 0
#endif /* NULL */

#define GIF_STAMP "GIFVER" /* First chars in file - GIF stamp. */
#define GIF_STAMP_LEN sizeof(GIF_STAMP) - 1
#define GIF_VERSION_POS 3 /* Version first character in stamp. */
#define GIF87_STAMP "GIF87a" /* First chars in file - GIF stamp. */
#define GIF89_STAMP "GIF89a" /* First chars in file - GIF stamp. */

#define GIF_FILE_BUFFER_SIZE 16384 /* Files uses bigger buffers than usual. */

typedef int GifBooleanType;
typedef unsigned char GifPixelType;
typedef unsigned char *GifRowType;
typedef unsigned char GifByteType;
#ifdef _GBA_OPTMEM
    typedef unsigned short GifPrefixType;
    typedef short GifWord;
#else
    typedef unsigned int GifPrefixType;
    typedef int GifWord;
#endif

#define GIF_MESSAGE(Msg) fprintf(stderr, "\n%s: %s\n", PROGRAM_NAME, Msg)
#define GIF_EXIT(Msg) { GIF_MESSAGE(Msg); exit(-3); }

#ifdef SYSV
#define VoidPtr char *
#else
#define VoidPtr void *
#endif /* SYSV */

typedef struct GifColorType {
    GifByteType Red, Green, Blue;
} GifColorType;

typedef struct ColorMapObject {
    int ColorCount;
    int BitsPerPixel;
    GifColorType *Colors; /* on malloc(3) heap */
} ColorMapObject;

typedef struct GifImageDesc {
    GifWord Left, Top, Width, Height, /* Current image dimensions. */
      Interlace; /* Sequential/Interlaced lines. */
    ColorMapObject *ColorMap; /* The local color map */
} GifImageDesc;

typedef struct GifFileType {
    GifWord SWidth, SHeight, /* Screen dimensions. */
      SColorResolution, /* How many colors can we generate? */
      SBackGroundColor; /* I hope you understand this one... */
    ColorMapObject *SColorMap; /* NULL if not exists. */
    int ImageCount; /* Number of current image */
    GifImageDesc Image; /* Block describing current image */
    struct SavedImage *SavedImages; /* Use this to accumulate file state */
    VoidPtr UserData; /* hook to attach user data (TVT) */
    VoidPtr Private; /* Don't mess with this! */
} GifFileType;

typedef enum {
    UNDEFINED_RECORD_TYPE,
    SCREEN_DESC_RECORD_TYPE,
    IMAGE_DESC_RECORD_TYPE, /* Begin with ',' */
    EXTENSION_RECORD_TYPE, /* Begin with '!' */
    TERMINATE_RECORD_TYPE /* Begin with ';' */
} GifRecordType;

/* DumpScreen2Gif routine constants identify type of window/screen to dump.
* Note all values below 1000 are reserved for the IBMPC different display
* devices (it has many!) and are compatible with the numbering TC2.0
* (Turbo C 2.0 compiler for IBM PC) gives to these devices.
*/
typedef enum {
    GIF_DUMP_SGI_WINDOW = 1000,
    GIF_DUMP_X_WINDOW = 1001
} GifScreenDumpType;

/* func type to read gif data from arbitrary sources (TVT) */
typedef int (*InputFunc) (GifFileType *, GifByteType *, int);

/* func type to write gif data ro arbitrary targets.
* Returns count of bytes written. (MRB)
*/
typedef int (*OutputFunc) (GifFileType *, const GifByteType *, int);

/******************************************************************************
* 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).
******************************************************************************/

GifFileType *EGifOpenFileName(const char *GifFileName,
                              int GifTestExistance);
GifFileType *EGifOpenFileHandle(int GifFileHandle);
GifFileType *EGifOpen(void *userPtr, OutputFunc writeFunc);

int EGifSpew(GifFileType * GifFile);
void EGifSetGifVersion(const char *Version);
int EGifPutScreenDesc(GifFileType * GifFile,
                      int GifWidth, int GifHeight, int GifColorRes,
                      int GifBackGround,
                      const ColorMapObject * GifColorMap);
int EGifPutImageDesc(GifFileType * GifFile, int GifLeft, int GifTop,
                     int Width, int GifHeight, int GifInterlace,
                     const ColorMapObject * GifColorMap);
int EGifPutLine(GifFileType * GifFile, GifPixelType * GifLine,
                int GifLineLen);
int EGifPutPixel(GifFileType * GifFile, GifPixelType GifPixel);
int EGifPutComment(GifFileType * GifFile, const char *GifComment);
int EGifPutExtensionFirst(GifFileType * GifFile, int GifExtCode,
                          int GifExtLen, const VoidPtr GifExtension);
int EGifPutExtensionNext(GifFileType * GifFile, int GifExtCode,
                         int GifExtLen, const VoidPtr GifExtension);
int EGifPutExtensionLast(GifFileType * GifFile, int GifExtCode,
                         int GifExtLen, const VoidPtr GifExtension);
int EGifPutExtension(GifFileType * GifFile, int GifExtCode, int GifExtLen,
                     const VoidPtr GifExtension);
int EGifPutCode(GifFileType * GifFile, int GifCodeSize,
                const GifByteType * GifCodeBlock);
int EGifPutCodeNext(GifFileType * GifFile,
                    const GifByteType * GifCodeBlock);
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).
*****************************************************************************/
#ifndef _GBA_NO_FILEIO
GifFileType *DGifOpenFileName(const char *GifFileName);
GifFileType *DGifOpenFileHandle(int GifFileHandle);
int DGifSlurp(GifFileType * GifFile);
#endif /* _GBA_NO_FILEIO */
GifFileType *DGifOpen(void *userPtr, InputFunc readFunc); /* new one
* (TVT) */
int DGifGetScreenDesc(GifFileType * GifFile);
int DGifGetRecordType(GifFileType * GifFile, GifRecordType * GifType);
int DGifGetImageDesc(GifFileType * GifFile);
int DGifGetLine(GifFileType * GifFile, GifPixelType * GifLine, int GifLineLen);
int DGifGetPixel(GifFileType * GifFile, GifPixelType GifPixel);
int DGifGetComment(GifFileType * GifFile, char *GifComment);
int DGifGetExtension(GifFileType * GifFile, int *GifExtCode,
                     GifByteType ** GifExtension);
int DGifGetExtensionNext(GifFileType * GifFile, GifByteType ** GifExtension);
int DGifGetCode(GifFileType * GifFile, int *GifCodeSize,
                GifByteType ** GifCodeBlock);
int DGifGetCodeNext(GifFileType * GifFile, GifByteType ** GifCodeBlock);
int DGifGetLZCodes(GifFileType * GifFile, int *GifCode);
int DGifCloseFile(GifFileType * GifFile);

#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

/******************************************************************************
* O.K., here are the routines from GIF_LIB file QUANTIZE.C.
******************************************************************************/
int QuantizeBuffer(unsigned int Width, unsigned int Height,
                   int *ColorMapSize, GifByteType * RedInput,
                   GifByteType * GreenInput, GifByteType * BlueInput,
                   GifByteType * OutputBuffer,
                   GifColorType * OutputColorMap);

/******************************************************************************
* O.K., here are the routines from GIF_LIB file QPRINTF.C.
******************************************************************************/
extern int GifQuietPrint;

#ifdef HAVE_STDARG_H
    extern void GifQprintf(char *Format, ...);
#elif defined (HAVE_VARARGS_H)
    extern void GifQprintf();
#endif /* HAVE_STDARG_H */

/******************************************************************************
* O.K., here are the routines from GIF_LIB file GIF_ERR.C.
******************************************************************************/
#ifndef _GBA_NO_FILEIO
extern void PrintGifError(void);
#endif /* _GBA_NO_FILEIO */
extern int GifLastError(void);

/******************************************************************************
* O.K., here are the routines from GIF_LIB file DEV2GIF.C.
******************************************************************************/
extern int DumpScreen2Gif(const char *FileName,
                          int ReqGraphDriver,
                          long ReqGraphMode1,
                          long ReqGraphMode2,
                          long ReqGraphMode3);

/*****************************************************************************
*
* Everything below this point is new after version 1.2, supporting `slurp
* mode' for doing I/O in two big belts with all the image-bashing in core.
*
*****************************************************************************/

/******************************************************************************
* Color Map handling from ALLOCGIF.C
*****************************************************************************/

extern ColorMapObject *MakeMapObject(int ColorCount,
                                     const GifColorType * ColorMap);
extern void FreeMapObject(ColorMapObject * Object);
extern ColorMapObject *UnionColorMap(const ColorMapObject * ColorIn1,
                                     const ColorMapObject * ColorIn2,
                                     GifPixelType ColorTransIn2[]);
extern int BitSize(int n);

/******************************************************************************
* Support for the in-core structures allocation (slurp mode).
*****************************************************************************/

/* This is the in-core version of an extension record */
typedef struct {
    int ByteCount;
    char *Bytes; /* on malloc(3) heap */
    int Function; /* Holds the type of the Extension block. */
} ExtensionBlock;

/* This holds an image header, its unpacked raster bits, and extensions */
typedef struct SavedImage {
    GifImageDesc ImageDesc;
    unsigned char *RasterBits; /* on malloc(3) heap */
    int Function; /* DEPRECATED: Use ExtensionBlocks[x].Function instead */
    int ExtensionBlockCount;
    ExtensionBlock *ExtensionBlocks; /* on malloc(3) heap */
} SavedImage;

extern void ApplyTranslation(SavedImage * Image, GifPixelType Translation[]);
extern void MakeExtension(SavedImage * New, int Function);
extern int AddExtensionBlock(SavedImage * New, int Len,
                             unsigned char ExtData[]);
extern void FreeExtension(SavedImage * Image);
extern SavedImage *MakeSavedImage(GifFileType * GifFile,
                                  const SavedImage * CopyFrom);
extern void FreeSavedImages(GifFileType * GifFile);

/******************************************************************************
* The library's internal utility font
*****************************************************************************/

#define GIF_FONT_WIDTH 8
#define GIF_FONT_HEIGHT 8
extern unsigned char AsciiTable[][GIF_FONT_WIDTH];

#ifdef _WIN32
    extern void DrawGifText(SavedImage * Image,
#else
    extern void DrawGifText(SavedImage * Image,
#endif
                     const int x, const int y,
                     const char *legend, const int color);

extern void DrawBox(SavedImage * Image,
                    const int x, const int y,
                    const int w, const int d, const int color);

void DrawRectangle(SavedImage * Image,
                   const int x, const int y,
                   const int w, const int d, const int color);

extern void DrawBoxedText(SavedImage * Image,
                          const int x, const int y,
                          const char *legend,
                          const int border, const int bg, const int fg);

#ifdef __cplusplus
}
#endif /* __cplusplus */
#endif /* _GIF_LIB_H */
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