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/////////////////////////////////////////////////////////////////////////////
// Name: wx/gifdecod.h
// Purpose: wxGIFDecoder, GIF reader for wxImage and wxAnimation
// Author: Guillermo Rodriguez Garcia <guille@iies.es>
// Version: 3.02
// Copyright: (c) 1999 Guillermo Rodriguez Garcia
// Licence: wxWindows licence
/////////////////////////////////////////////////////////////////////////////
#ifndef _WX_GIFDECOD_H_
#define _WX_GIFDECOD_H_
#include "wx/defs.h"
#if wxUSE_STREAMS && wxUSE_GIF
#include "wx/stream.h"
#include "wx/image.h"
#include "wx/animdecod.h"
#include "wx/dynarray.h"
// internal utility used to store a frame in 8bit-per-pixel format
class GIFImage;
// --------------------------------------------------------------------------
// Constants
// --------------------------------------------------------------------------
// Error codes:
// Note that the error code wxGIF_TRUNCATED means that the image itself
// is most probably OK, but the decoder didn't reach the end of the data
// stream; this means that if it was not reading directly from file,
// the stream will not be correctly positioned.
//
enum wxGIFErrorCode
{
wxGIF_OK = 0, // everything was OK
wxGIF_INVFORMAT, // error in GIF header
wxGIF_MEMERR, // error allocating memory
wxGIF_TRUNCATED // file appears to be truncated
};
// --------------------------------------------------------------------------
// wxGIFDecoder class
// --------------------------------------------------------------------------
class WXDLLIMPEXP_CORE wxGIFDecoder : public wxAnimationDecoder
{
public:
// constructor, destructor, etc.
wxGIFDecoder();
~wxGIFDecoder();
// get data of current frame
unsigned char* GetData(unsigned int frame) const;
unsigned char* GetPalette(unsigned int frame) const;
unsigned int GetNcolours(unsigned int frame) const;
int GetTransparentColourIndex(unsigned int frame) const;
wxColour GetTransparentColour(unsigned int frame) const;
virtual wxSize GetFrameSize(unsigned int frame) const;
virtual wxPoint GetFramePosition(unsigned int frame) const;
virtual wxAnimationDisposal GetDisposalMethod(unsigned int frame) const;
virtual long GetDelay(unsigned int frame) const;
// GIFs can contain both static images and animations
bool IsAnimation() const
{ return m_nFrames > 1; }
// load function which returns more info than just Load():
wxGIFErrorCode LoadGIF( wxInputStream& stream );
// free all internal frames
void Destroy();
// implementation of wxAnimationDecoder's pure virtuals
virtual bool Load( wxInputStream& stream )
{ return LoadGIF(stream) == wxGIF_OK; }
bool ConvertToImage(unsigned int frame, wxImage *image) const;
wxAnimationDecoder *Clone() const
{ return new wxGIFDecoder; }
wxAnimationType GetType() const
{ return wxANIMATION_TYPE_GIF; }
private:
// wxAnimationDecoder pure virtual
virtual bool DoCanRead( wxInputStream& stream ) const;
// modifies current stream position (see wxAnimationDecoder::CanRead)
int getcode(wxInputStream& stream, int bits, int abfin);
wxGIFErrorCode dgif(wxInputStream& stream,
GIFImage *img, int interl, int bits);
// array of all frames
wxArrayPtrVoid m_frames;
// decoder state vars
int m_restbits; // remaining valid bits
unsigned int m_restbyte; // remaining bytes in this block
unsigned int m_lastbyte; // last byte read
unsigned char m_buffer[256]; // buffer for reading
unsigned char *m_bufp; // pointer to next byte in buffer
wxDECLARE_NO_COPY_CLASS(wxGIFDecoder);
};
#endif // wxUSE_STREAMS && wxUSE_GIF
#endif // _WX_GIFDECOD_H_
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