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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	// --------------------------------------------------------------------------
	27	// constants
	28	// --------------------------------------------------------------------------
	29
	30	// disposal method
	31	enum
	32	{
	33	wxGIF_D_UNSPECIFIED = -1, /* not specified */
	34	wxGIF_D_DONOTDISPOSE = 0, /* do not dispose */
	35	wxGIF_D_TOBACKGROUND = 1, /* restore to background colour */
	36	wxGIF_D_TOPREVIOUS = 2 /* restore to previous image */
	37	};
	38
	39	// error codes
	40	enum
	41	{
	42	wxGIF_OK = 0, /* everything was OK */
	43	wxGIF_INVFORMAT = 1, /* error in gif header */
	44	wxGIF_MEMERR = 2 /* error allocating memory */
	45	};
	46
	47	#define MAX_BLOCK_SIZE 256 /* max. block size */
	48
	49
	50	// --------------------------------------------------------------------------
	51	// wxGIFDecoder class
	52	// --------------------------------------------------------------------------
	53
	54	// internal class for storing GIF image data
	55	class GIFImage
	56	{
	57	public:
	58	unsigned int w; /* width */
	59	unsigned int h; /* height */
	60	unsigned int left; /* x coord (in logical screen) */
	61	unsigned int top; /* y coord (in logical screen) */
	62	int transparent; /* transparent color (-1 = none) */
	63	int disposal; /* disposal method (-1 = unspecified) */
	64	long delay; /* delay in ms (-1 = unused) */
	65	unsigned char p; / bitmap */
	66	unsigned char pal; / palette */
	67	GIFImage next; / next image */
	68	GIFImage prev; / prev image */
	69	};
	70
	71
	72	class WXDLLEXPORT wxGIFDecoder
	73	{
	74	private:
	75	// logical screen
	76	unsigned int m_screenw; /* logical screen width */
	77	unsigned int m_screenh; /* logical screen height */
	78	int m_background; /* background color (-1 = none) */
	79
	80	// image data
	81	bool m_anim; /* animated GIF */
	82	int m_nimages; /* number of images */
	83	int m_image; /* current image */
	84	GIFImage m_pimage; / pointer to current image */
	85	GIFImage m_pfirst; / pointer to first image */
	86	GIFImage m_plast; / pointer to last image */
	87
	88	// decoder state vars
	89	int m_restbits; /* remaining valid bits */
	90	unsigned int m_restbyte; /* remaining bytes in this block */
	91	unsigned int m_lastbyte; /* last byte read */
	92	unsigned char m_buffer[MAX_BLOCK_SIZE]; /* buffer for reading */
	93	unsigned char m_bufp; / pointer to next byte in buffer */
	94
	95	// input stream
	96	wxInputStream m_f; / input stream */
	97
	98	private:
	99	int getcode(int bits, int abfin);
	100	int dgif(GIFImage *img, int interl, int bits);
	101
	102	protected:
	103	// get data of current frame
	104	int GetFrameIndex() const;
	105	unsigned char* GetData() const;
	106	unsigned char* GetPalette() const;
	107	unsigned int GetWidth() const;
	108	unsigned int GetHeight() const;
	109	unsigned int GetLeft() const;
	110	unsigned int GetTop() const;
	111	int GetDisposalMethod() const;
	112	int GetTransparentColour() const;
	113	long GetDelay() const;
	114
	115	// get global data
	116	unsigned int GetLogicalScreenWidth() const;
	117	unsigned int GetLogicalScreenHeight() const;
	118	int GetBackgroundColour() const;
	119	int GetNumberOfFrames() const;
	120	bool IsAnimation() const;
	121
	122	// move through the animation
	123	bool GoFirstFrame();
	124	bool GoLastFrame();
	125	bool GoNextFrame(bool cyclic = FALSE);
	126	bool GoPrevFrame(bool cyclic = FALSE);
	127	bool GoFrame(int which);
	128
	129	public:
	130	// constructor, destructor, etc.
	131	wxGIFDecoder(wxInputStream *s, bool anim = FALSE);
	132	~wxGIFDecoder();
	133	bool CanRead();
	134	int ReadGIF();
	135	void Destroy();
	136
	137	// convert current frame to wxImage
	138	bool ConvertToImage(wxImage *image) const;
	139	};
	140
	141
	142	#endif // wxUSE_STREAM && wxUSE_GIF
	143	#endif // _WX_GIFDECOD_H
	144