8907154c1a
git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@35650 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775
157 lines
4.9 KiB
C++
157 lines
4.9 KiB
C++
/////////////////////////////////////////////////////////////////////////////
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// Name: 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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// --------------------------------------------------------------------------
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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. the
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//
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enum
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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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// Disposal method
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// Experimental; subject to change.
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//
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enum
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{
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wxGIF_D_UNSPECIFIED = -1, /* not specified */
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wxGIF_D_DONOTDISPOSE = 0, /* do not dispose */
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wxGIF_D_TOBACKGROUND = 1, /* restore to background colour */
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wxGIF_D_TOPREVIOUS = 2 /* restore to previous image */
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};
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#define MAX_BLOCK_SIZE 256 /* max. block size */
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// --------------------------------------------------------------------------
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// wxGIFDecoder class
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// --------------------------------------------------------------------------
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// internal class for storing GIF image data
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class GIFImage
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{
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public:
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// def ctor
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GIFImage();
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unsigned int w; /* width */
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unsigned int h; /* height */
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unsigned int left; /* x coord (in logical screen) */
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unsigned int top; /* y coord (in logical screen) */
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int transparent; /* transparent color (-1 = none) */
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int disposal; /* disposal method (-1 = unspecified) */
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long delay; /* delay in ms (-1 = unused) */
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unsigned char *p; /* bitmap */
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unsigned char *pal; /* palette */
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GIFImage *next; /* next image */
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GIFImage *prev; /* prev image */
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DECLARE_NO_COPY_CLASS(GIFImage)
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};
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class WXDLLEXPORT wxGIFDecoder
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{
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private:
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// logical screen
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unsigned int m_screenw; /* logical screen width */
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unsigned int m_screenh; /* logical screen height */
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int m_background; /* background color (-1 = none) */
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// image data
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bool m_anim; /* animated GIF */
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int m_nimages; /* number of images */
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int m_image; /* current image */
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GIFImage *m_pimage; /* pointer to current image */
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GIFImage *m_pfirst; /* pointer to first image */
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GIFImage *m_plast; /* pointer to last image */
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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[MAX_BLOCK_SIZE]; /* buffer for reading */
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unsigned char *m_bufp; /* pointer to next byte in buffer */
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// input stream
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wxInputStream *m_f; /* input stream */
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private:
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int getcode(int bits, int abfin);
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int dgif(GIFImage *img, int interl, int bits);
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public:
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// get data of current frame
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int GetFrameIndex() const;
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unsigned char* GetData() const;
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unsigned char* GetPalette() const;
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unsigned int GetWidth() const;
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unsigned int GetHeight() const;
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unsigned int GetLeft() const;
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unsigned int GetTop() const;
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int GetDisposalMethod() const;
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int GetTransparentColour() const;
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long GetDelay() const;
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// get global data
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unsigned int GetLogicalScreenWidth() const;
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unsigned int GetLogicalScreenHeight() const;
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int GetBackgroundColour() const;
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int GetNumberOfFrames() const;
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bool IsAnimation() const;
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// move through the animation
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bool GoFirstFrame();
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bool GoLastFrame();
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bool GoNextFrame(bool cyclic = false);
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bool GoPrevFrame(bool cyclic = false);
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bool GoFrame(int which);
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public:
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// constructor, destructor, etc.
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wxGIFDecoder(wxInputStream *s, bool anim = false);
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~wxGIFDecoder();
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bool CanRead();
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int ReadGIF();
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void Destroy();
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// convert current frame to wxImage
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bool ConvertToImage(wxImage *image) const;
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DECLARE_NO_COPY_CLASS(wxGIFDecoder)
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};
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#endif // wxUSE_STREAM && wxUSE_GIF
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#endif // _WX_GIFDECOD_H
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