Added gifdecod.h

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@3408 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

diff --git a/include/wx/gifdecod.h b/include/wx/gifdecod.h
new file mode 100644 (file)
index 0000000..30fa11c
--- /dev/null
+++ b/include/wx/gifdecod.h
@@ -0,0 +1,121 @@
+/////////////////////////////////////////////////////////////////////////////
+// Name:        gifdecod.h
+// Purpose:     wxGIFDecoder, GIF reader for wxImage and wxAnimation
+// Author:      Guillermo Rodriguez Garcia <guille@iies.es>
+// Version:     3.0
+// Last rev:    1999/08/10
+// Copyright:   (c) Guillermo Rodriguez Garcia
+// Licence:     wxWindows licence
+/////////////////////////////////////////////////////////////////////////////
+
+#ifndef _WX_GIFDECOD_H
+#define _WX_GIFDECOD_H
+
+#ifdef __GNUG__
+#pragma interface "gifdecod.h"
+#endif
+
+#include "wx/setup.h"
+
+#if wxUSE_STREAMS
+#include "wx/stream.h"
+#include "wx/image.h"
+
+
+typedef struct _IMAGEN
+{
+    unsigned int w;                 /* width */
+    unsigned int h;                 /* height */
+    unsigned int left;              /* x coord (in logical screen) */
+    unsigned int top;               /* y coord (in logical screen) */
+    int transparent;                /* transparent color (-1 = none) */
+    int disposal;                   /* disposal method */
+    long delay;                     /* delay in ms (-1 = unused) */
+    unsigned char *p;               /* bitmap */
+    unsigned char *pal;             /* palette */
+    struct _IMAGEN *next;           /* next image */
+    struct _IMAGEN *prev;           /* prev image */
+} IMAGEN;
+
+
+/* disposal method */
+#define D_UNSPECIFIED   -1          /* not specified */
+#define D_DONOTDISPOSE  0           /* do not dispose */
+#define D_TOBACKGROUND  1           /* restore to background colour */
+#define D_TOPREVIOUS    2           /* restore to previous image */
+
+/* error codes */
+#define E_OK            0           /* everything was OK */
+#define E_ARCHIVO       -1          /* error opening file */
+#define E_FORMATO       -2          /* error in gif header */
+#define E_MEMORIA       -3          /* error allocating memory */
+
+
+class wxGIFDecoder
+{
+private:
+    /* logical screen */
+    unsigned int  m_screenw;        /* logical screen width */
+    unsigned int  m_screenh;        /* logical screen height */
+    int           m_background;     /* background color (-1 = none) */
+
+    /* image data */
+    bool          m_anim;           /* animated GIF */
+    int           m_nimages;        /* number of images */
+    int           m_image;          /* current image */
+    IMAGEN        *m_pimage;        /* pointer to current image */
+    IMAGEN        *m_pfirst;        /* pointer to first image */
+    IMAGEN        *m_plast;         /* pointer to last image */
+
+    /* 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 */
+
+    wxInputStream *m_f;             /* input file */
+
+private:
+    int getcode(int bits, int abfin);
+    int dgif(IMAGEN *img, int interl, int bits);
+
+public:
+    // constructor, destructor, etc.
+    wxGIFDecoder(wxInputStream *s, bool anim = FALSE);
+    ~wxGIFDecoder();
+    int ReadGIF();
+    void Destroy();
+
+    // convert current frame to wxImage
+    bool ConvertToImage(wxImage *image) const;
+
+    // get data of current frame
+    int GetFrameIndex() const;
+    unsigned char* GetData() const;
+    unsigned char* GetPalette() const;
+    unsigned int GetWidth() const;
+    unsigned int GetHeight() const;
+    unsigned int GetLeft() const;
+    unsigned int GetTop() const;
+    int GetDisposalMethod() const;
+    int GetTransparentColour() const;
+    long GetDelay() const;
+
+    // get global data
+    unsigned int GetLogicalScreenWidth() const;
+    unsigned int GetLogicalScreenHeight() const;
+    int GetBackgroundColour() const;
+    int GetNumberOfFrames() const;
+    bool IsAnimation() const;
+
+    // move through the animation
+    bool GoFirstFrame();
+    bool GoLastFrame();
+    bool GoNextFrame(bool cyclic = FALSE);
+    bool GoPrevFrame(bool cyclic = FALSE);
+    bool GoFrame(int which);
+};
+
+
+#endif  // wxUSE_STREAM
+#endif  // _WX_GIFDECOD_H
+