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Commit	Line	Data
	1	/////////////////////////////////////////////////////////////////////////////
	2	// Name: wx/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	#include "wx/defs.h"
	15
	16	#if wxUSE_STREAMS && wxUSE_GIF
	17
	18	#include "wx/stream.h"
	19	#include "wx/image.h"
	20	#include "wx/animdecod.h"
	21	#include "wx/dynarray.h"
	22
	23	// internal utility used to store a frame in 8bit-per-pixel format
	24	class GIFImage;
	25
	26
	27	// --------------------------------------------------------------------------
	28	// Constants
	29	// --------------------------------------------------------------------------
	30
	31	// Error codes:
	32	// Note that the error code wxGIF_TRUNCATED means that the image itself
	33	// is most probably OK, but the decoder didn't reach the end of the data
	34	// stream; this means that if it was not reading directly from file,
	35	// the stream will not be correctly positioned.
	36	//
	37	enum wxGIFErrorCode
	38	{
	39	wxGIF_OK = 0, // everything was OK
	40	wxGIF_INVFORMAT, // error in GIF header
	41	wxGIF_MEMERR, // error allocating memory
	42	wxGIF_TRUNCATED // file appears to be truncated
	43	};
	44
	45	// --------------------------------------------------------------------------
	46	// wxGIFDecoder class
	47	// --------------------------------------------------------------------------
	48
	49	class WXDLLIMPEXP_CORE wxGIFDecoder : public wxAnimationDecoder
	50	{
	51	public:
	52	// constructor, destructor, etc.
	53	wxGIFDecoder();
	54	~wxGIFDecoder();
	55
	56	// get data of current frame
	57	unsigned char* GetData(unsigned int frame) const;
	58	unsigned char* GetPalette(unsigned int frame) const;
	59	unsigned int GetNcolours(unsigned int frame) const;
	60	int GetTransparentColourIndex(unsigned int frame) const;
	61	wxColour GetTransparentColour(unsigned int frame) const;
	62
	63	virtual wxSize GetFrameSize(unsigned int frame) const;
	64	virtual wxPoint GetFramePosition(unsigned int frame) const;
	65	virtual wxAnimationDisposal GetDisposalMethod(unsigned int frame) const;
	66	virtual long GetDelay(unsigned int frame) const;
	67
	68	// GIFs can contain both static images and animations
	69	bool IsAnimation() const
	70	{ return m_nFrames > 1; }
	71
	72	// load function which returns more info than just Load():
	73	wxGIFErrorCode LoadGIF( wxInputStream& stream );
	74
	75	// free all internal frames
	76	void Destroy();
	77
	78	// implementation of wxAnimationDecoder's pure virtuals
	79	virtual bool CanRead( wxInputStream& stream ) const;
	80	virtual bool Load( wxInputStream& stream )
	81	{ return LoadGIF(stream) == wxGIF_OK; }
	82
	83	bool ConvertToImage(unsigned int frame, wxImage *image) const;
	84
	85	wxAnimationDecoder *Clone() const
	86	{ return new wxGIFDecoder; }
	87	wxAnimationType GetType() const
	88	{ return wxANIMATION_TYPE_GIF; }
	89
	90	private:
	91	// array of all frames
	92	wxArrayPtrVoid m_frames;
	93
	94	// decoder state vars
	95	int m_restbits; // remaining valid bits
	96	unsigned int m_restbyte; // remaining bytes in this block
	97	unsigned int m_lastbyte; // last byte read
	98	unsigned char m_buffer[256]; // buffer for reading
	99	unsigned char *m_bufp; // pointer to next byte in buffer
	100
	101	int getcode(wxInputStream& stream, int bits, int abfin);
	102	wxGIFErrorCode dgif(wxInputStream& stream,
	103	GIFImage *img, int interl, int bits);
	104
	105	DECLARE_NO_COPY_CLASS(wxGIFDecoder)
	106	};
	107
	108	#endif // wxUSE_STREAMS && wxUSE_GIF
	109
	110	#endif // _WX_GIFDECOD_H_