b0f76951bc
git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@47637 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775
111 lines
3.7 KiB
C++
111 lines
3.7 KiB
C++
/////////////////////////////////////////////////////////////////////////////
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// Name: wx/gifdecod.h
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// Purpose: wxGIFDecoder, GIF reader for wxImage and wxAnimation
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// Author: Guillermo Rodriguez Garcia <guille@iies.es>
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// Version: 3.02
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// CVS-ID: $Id$
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// Copyright: (c) 1999 Guillermo Rodriguez Garcia
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// Licence: wxWindows licence
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/////////////////////////////////////////////////////////////////////////////
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#ifndef _WX_GIFDECOD_H_
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#define _WX_GIFDECOD_H_
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#include "wx/defs.h"
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#if wxUSE_STREAMS && wxUSE_GIF
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#include "wx/stream.h"
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#include "wx/image.h"
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#include "wx/animdecod.h"
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#include "wx/dynarray.h"
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// internal utility used to store a frame in 8bit-per-pixel format
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class GIFImage;
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// --------------------------------------------------------------------------
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// Constants
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// --------------------------------------------------------------------------
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// Error codes:
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// Note that the error code wxGIF_TRUNCATED means that the image itself
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// is most probably OK, but the decoder didn't reach the end of the data
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// stream; this means that if it was not reading directly from file,
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// the stream will not be correctly positioned.
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//
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enum wxGIFErrorCode
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{
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wxGIF_OK = 0, // everything was OK
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wxGIF_INVFORMAT, // error in GIF header
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wxGIF_MEMERR, // error allocating memory
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wxGIF_TRUNCATED // file appears to be truncated
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};
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// --------------------------------------------------------------------------
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// wxGIFDecoder class
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// --------------------------------------------------------------------------
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class WXDLLEXPORT wxGIFDecoder : public wxAnimationDecoder
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{
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public:
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// constructor, destructor, etc.
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wxGIFDecoder();
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~wxGIFDecoder();
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// get data of current frame
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unsigned char* GetData(unsigned int frame) const;
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unsigned char* GetPalette(unsigned int frame) const;
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unsigned int GetNcolours(unsigned int frame) const;
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int GetTransparentColourIndex(unsigned int frame) const;
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wxColour GetTransparentColour(unsigned int frame) const;
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virtual wxSize GetFrameSize(unsigned int frame) const;
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virtual wxPoint GetFramePosition(unsigned int frame) const;
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virtual wxAnimationDisposal GetDisposalMethod(unsigned int frame) const;
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virtual long GetDelay(unsigned int frame) const;
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// GIFs can contain both static images and animations
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bool IsAnimation() const
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{ return m_nFrames > 1; }
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// load function which returns more info than just Load():
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wxGIFErrorCode LoadGIF( wxInputStream& stream );
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// free all internal frames
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void Destroy();
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// implementation of wxAnimationDecoder's pure virtuals
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virtual bool CanRead( wxInputStream& stream ) const;
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virtual bool Load( wxInputStream& stream )
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{ return LoadGIF(stream) == wxGIF_OK; }
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bool ConvertToImage(unsigned int frame, wxImage *image) const;
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wxAnimationDecoder *Clone() const
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{ return new wxGIFDecoder; }
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wxAnimationType GetType() const
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{ return wxANIMATION_TYPE_GIF; }
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private:
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// array of all frames
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wxArrayPtrVoid m_frames;
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// decoder state vars
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int m_restbits; // remaining valid bits
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unsigned int m_restbyte; // remaining bytes in this block
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unsigned int m_lastbyte; // last byte read
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unsigned char m_buffer[256]; // buffer for reading
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unsigned char *m_bufp; // pointer to next byte in buffer
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int getcode(wxInputStream& stream, int bits, int abfin);
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wxGIFErrorCode dgif(wxInputStream& stream,
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GIFImage *img, int interl, int bits);
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DECLARE_NO_COPY_CLASS(wxGIFDecoder)
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};
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#endif // wxUSE_STREAMS && wxUSE_GIF
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#endif // _WX_GIFDECOD_H_
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