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Commit	Line	Data
	1	/////////////////////////////////////////////////////////////////////////////
	2	// Name: gifdecod.h
	3	// Purpose: wxGIFDecoder, GIF reader for wxImage and wxAnimation
	4	// Author: Guillermo Rodriguez Garcia <guille@iies.es>
	5	// Version: 3.02
	6	// CVS-ID: $Id$
	7	// Copyright: (c) 1999 Guillermo Rodriguez Garcia
	8	// Licence: wxWindows licence
	9	/////////////////////////////////////////////////////////////////////////////
	10
	11	#ifndef _WX_GIFDECOD_H
	12	#define _WX_GIFDECOD_H
	13
	14	#ifdef __GNUG__
	15	#pragma interface "gifdecod.h"
	16	#endif
	17
	18	#include "wx/setup.h"
	19
	20	#if wxUSE_STREAMS && wxUSE_GIF
	21
	22	#include "wx/stream.h"
	23	#include "wx/image.h"
	24
	25
	26	typedef struct _IMAGEN
	27	{
	28	unsigned int w; /* width */
	29	unsigned int h; /* height */
	30	unsigned int left; /* x coord (in logical screen) */
	31	unsigned int top; /* y coord (in logical screen) */
	32	int transparent; /* transparent color (-1 = none) */
	33	int disposal; /* disposal method (-1 = unspecified) */
	34	long delay; /* delay in ms (-1 = unused) */
	35	unsigned char p; / bitmap */
	36	unsigned char pal; / palette */
	37	struct _IMAGEN next; / next image */
	38	struct _IMAGEN prev; / prev image */
	39	} IMAGEN;
	40
	41
	42	/* disposal method */
	43	#define D_UNSPECIFIED -1 /* not specified */
	44	#define D_DONOTDISPOSE 0 /* do not dispose */
	45	#define D_TOBACKGROUND 1 /* restore to background colour */
	46	#define D_TOPREVIOUS 2 /* restore to previous image */
	47
	48	/* error codes */
	49	#define E_OK 0 /* everything was OK */
	50	#define E_FORMATO 1 /* error in gif header */
	51	#define E_MEMORIA 2 /* error allocating memory */
	52
	53	class WXDLLEXPORT wxGIFDecoder
	54	{
	55	private:
	56	/* logical screen */
	57	unsigned int m_screenw; /* logical screen width */
	58	unsigned int m_screenh; /* logical screen height */
	59	int m_background; /* background color (-1 = none) */
	60
	61	/* image data */
	62	bool m_anim; /* animated GIF */
	63	int m_nimages; /* number of images */
	64	int m_image; /* current image */
	65	IMAGEN m_pimage; / pointer to current image */
	66	IMAGEN m_pfirst; / pointer to first image */
	67	IMAGEN m_plast; / pointer to last image */
	68
	69	/* decoder state vars */
	70	int m_restbits; /* remaining valid bits */
	71	unsigned int m_restbyte; /* remaining bytes in this block */
	72	unsigned int m_lastbyte; /* last byte read */
	73
	74	wxInputStream m_f; / input file */
	75
	76	private:
	77	int getcode(int bits, int abfin);
	78	int dgif(IMAGEN *img, int interl, int bits);
	79
	80	public:
	81	// constructor, destructor, etc.
	82	wxGIFDecoder(wxInputStream *s, bool anim = FALSE);
	83	~wxGIFDecoder();
	84	bool CanRead();
	85	int ReadGIF();
	86	void Destroy();
	87
	88	// convert current frame to wxImage
	89	bool ConvertToImage(wxImage *image) const;
	90
	91	// get data of current frame
	92	int GetFrameIndex() const;
	93	unsigned char* GetData() const;
	94	unsigned char* GetPalette() const;
	95	unsigned int GetWidth() const;
	96	unsigned int GetHeight() const;
	97	unsigned int GetLeft() const;
	98	unsigned int GetTop() const;
	99	int GetDisposalMethod() const;
	100	int GetTransparentColour() const;
	101	long GetDelay() const;
	102
	103	// get global data
	104	unsigned int GetLogicalScreenWidth() const;
	105	unsigned int GetLogicalScreenHeight() const;
	106	int GetBackgroundColour() const;
	107	int GetNumberOfFrames() const;
	108	bool IsAnimation() const;
	109
	110	// move through the animation
	111	bool GoFirstFrame();
	112	bool GoLastFrame();
	113	bool GoNextFrame(bool cyclic = FALSE);
	114	bool GoPrevFrame(bool cyclic = FALSE);
	115	bool GoFrame(int which);
	116	};
	117
	118
	119	#endif // wxUSE_STREAM && wxUSE_GIF
	120	#endif // _WX_GIFDECOD_H
	121