// Gif.h: interface for the CGif class.
//
//////////////////////////////////////////////////////////////////////
#if !defined(AFX_GIF_H__82031240_001C_11D3_9481_000021003EA5__INCLUDED_)
#define AFX_GIF_H__82031240_001C_11D3_9481_000021003EA5__INCLUDED_
#if _MSC_VER > 1000
#pragma once
#endif // _MSC_VER > 1000
#include "Dib.h"
//////////////////////////////////////////////////////////////////
// constants
//
#define MAXCOLORMAPSIZE 256
#define CM_RED 0
#define CM_GREEN 1
#define CM_BLUE 2
#define MAX_LZW_BITS 12
#define BITS 12
#define HSIZE 5003 /* 80% occupancy */
#define INTERLACE 0x40
#define LOCALCOLORMAP 0x80
//////////////////////////////////////////////////////////////////
// macros
//
#define BitSet(byte,bit) (((byte) & (bit))==(bit))
#define ReadOK(file,buffer,len) (fread(buffer,len,1,file)!=0)
#define LM_to_uint(a,b) (((b) #define MAXCODE(n_bits) (((code_int) 1
//////////////////////////////////////////////////////////////////
// owner type
//
typedef short int code_int; /* was int */
typedef long int count_int;
typedef unsigned char pixval;
typedef unsigned char char_type;
//////////////////////////////////////////////////////////////////
// structures
//
typedef struct tagGIFSCREEN
{
unsigned int Width;
unsigned int Height;
unsigned char ColorMap[3][MAXCOLORMAPSIZE];
unsigned int BitPixel;
unsigned int ColorResolution;
unsigned int BackGround;
unsigned int AspectRatio;
} GIFSCREEN;
typedef struct tagGIF89
{
int transparent;
int delayTime;
int inputFlag;
int disposal;
} GIF89;
////////////////////////////////////////////////////////////
// class CGif
//
class CGif
{
// constructor
public:
CGif();
CGif(CDib *pDib);
virtual ~CGif();
// public functions
public:
// Get CDib
CDib * GetDib()
{
return m_pDib;
}
//Set CDib
BOOL SetDib(CDib *pDib)
{
if (pDib == NULL)
return FALSE;
if (m_pDib != NULL)
delete m_pDib;
m_pDib = pDib->Clone();
return (m_pDib != NULL);
}
// Load GIF file
BOOL Load(LPCTSTR lpstrFileName);
// save GIF file
BOOL Save(LPCTSTR lpstrFileName, CDib* pDib = NULL);
// get error string
CString GetErrorString();
// internal functions
private:
// read to RGB
LPBYTE ReadGIFFile(LPCTSTR lpstrFileName, UINT *uWidth, UINT *uHeight);
// write 256 RGB to file
BOOL WriteGIFFile(LPCTSTR lpstrFileName, BYTE* buf, int GWidth, int GHeight,
int BackGround, int Red[], int Green[], int Blue[]);
// free allocate memory
void FreeBuffer(BYTE *Buffer);
int ReadColorMap (FILE *fd, int number, BYTE buffer[3][MAXCOLORMAPSIZE]);
int DoExtension (FILE *fd,int label);
int GetDataBlock (FILE *fd, BYTE *buf);
int GetCode (FILE *fd, int code_size, int flag);
int LZWReadByte (FILE *fd,int flag, int input_code_size);
BOOL ReadImage(FILE *fd, BYTE * bigMemBuf, int width, int height,
BYTE cmap[3][MAXCOLORMAPSIZE], int interlace);
void BumpPixel();
int GIFNextPixel();
void Putword(int w, FILE* fp);
void compress(int init_bits, FILE* outfile);
void output(code_int code);
void cl_block();
void cl_hash(count_int hsize);
void writeerr();
void char_init();
void char_out(int c);
void flush_char();
BYTE* MakeDwordAlign(BYTE *dataBuf, // input buf
UINT widthPix, // input pixels
UINT height, // lines
UINT *uiOutWidthBytes); // new width bytes
BYTE* ClearDwordAlign(BYTE *inBuf, // input buf
UINT widthPix, // input size
UINT height,
UINT nBpp);
BOOL VertFlipBuf(BYTE * inbuf, // input buf
UINT widthBytes, // input width bytes
UINT height); // height
BOOL BGRFromRGB(BYTE *buf, // input buf
UINT widthPix, // width in pixels
UINT height); // lines
// private data
private:
// attributes
CDib* m_pDib;
// data
int ZeroDataBlock;
CString m_strGIFError;
int Width, Height;
int curx, cury;
long CountDown;
unsigned long cur_accum;
int cur_bits;
unsigned char *buffer;
int n_bits; /* number of bits/code */
int maxbits; /* user settable max # bits/code */
code_int maxcode; /* maximum code, given n_bits */
code_int maxmaxcode; /* should NEVER generate this code */
count_int htab [HSIZE];
unsigned short codetab [HSIZE];
code_int free_ent; /* first unused entry */
int clear_flg;
int g_init_bits;
FILE* g_outfile;
int ClearCode;
int EOFCode;
int a_count;
char accum[256];
};
#endif // !defined(AFX_GIF_H__82031240_001C_11D3_9481_000021003EA5__INCLUDED_)
