initial commit

Signed-off-by: Peter Siegmund <mars3142@noreply.mars3142.dev>

libs/wxWidgets-3.3.1/include/wx/gifdecod.h

@@ -0,0 +1,114 @@
+/////////////////////////////////////////////////////////////////////////////
+// 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 override;
+
+    virtual wxSize GetFrameSize(unsigned int frame) const override;
+    virtual wxPoint GetFramePosition(unsigned int frame) const override;
+    virtual wxAnimationDisposal GetDisposalMethod(unsigned int frame) const override;
+    virtual long GetDelay(unsigned int frame) const override;
+
+    // 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 ) override
+        { return LoadGIF(stream) == wxGIF_OK; }
+
+    bool ConvertToImage(unsigned int frame, wxImage *image) const override;
+
+    wxNODISCARD wxAnimationDecoder *Clone() const override
+        { return new wxGIFDecoder; }
+    wxAnimationType GetType() const override
+        { return wxANIMATION_TYPE_GIF; }
+
+protected:
+    // wxAnimationDecoder pure virtual
+    virtual bool DoCanRead( wxInputStream& stream ) const override;
+        // modifies current stream position (see wxAnimationDecoder::CanRead)
+
+private:
+    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_