fix loading ICO from socket stream: override OnSysTell and OnSysSeek rather than...

[wxWidgets.git] / include / wx / gifdecod.h

diff --git a/include/wx/gifdecod.h b/include/wx/gifdecod.h
index cb9490e8922f6e6b3f1ee87526591b621484a048..15208231576b9aad2211fba01162ae6ec1808277 100644 (file)
--- a/include/wx/gifdecod.h
+++ b/include/wx/gifdecod.h
@@ -1,5 +1,5 @@
 /////////////////////////////////////////////////////////////////////////////
 /////////////////////////////////////////////////////////////////////////////

-// Name:        gifdecod.h
+// Name:        wx/gifdecod.h

 // Purpose:     wxGIFDecoder, GIF reader for wxImage and wxAnimation
 // Author:      Guillermo Rodriguez Garcia <guille@iies.es>
 // Version:     3.02
 // Purpose:     wxGIFDecoder, GIF reader for wxImage and wxAnimation
 // Author:      Guillermo Rodriguez Garcia <guille@iies.es>
 // Version:     3.02


@@ -8,8 +8,8 @@
 // Licence:     wxWindows licence
 /////////////////////////////////////////////////////////////////////////////
 
 // Licence:     wxWindows licence
 /////////////////////////////////////////////////////////////////////////////
 

-#ifndef _WX_GIFDECOD_H
-#define _WX_GIFDECOD_H
+#ifndef _WX_GIFDECOD_H_
+#define _WX_GIFDECOD_H_

 
 #include "wx/defs.h"
 
 
 #include "wx/defs.h"
 


@@ -17,6 +17,11 @@
 
 #include "wx/stream.h"
 #include "wx/image.h"
 
 #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;

 
 
 // --------------------------------------------------------------------------
 
 
 // --------------------------------------------------------------------------


@@ -27,132 +32,83 @@
 //  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,
 //  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. the
+//  the stream will not be correctly positioned.

 //
 //

-enum
+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 */
+    wxGIF_OK = 0,                   // everything was OK
+    wxGIF_INVFORMAT,                // error in GIF header
+    wxGIF_MEMERR,                   // error allocating memory
+    wxGIF_TRUNCATED                 // file appears to be truncated

 };
 
 };
 

-// Disposal method
-//  Experimental; subject to change.
-//
-enum
-{
-    wxGIF_D_UNSPECIFIED = -1,       /* not specified */
-    wxGIF_D_DONOTDISPOSE = 0,       /* do not dispose */
-    wxGIF_D_TOBACKGROUND = 1,       /* restore to background colour */
-    wxGIF_D_TOPREVIOUS = 2          /* restore to previous image */
-};
-
-
-#define MAX_BLOCK_SIZE 256          /* max. block size */
-
-

 // --------------------------------------------------------------------------
 // wxGIFDecoder class
 // --------------------------------------------------------------------------
 
 // --------------------------------------------------------------------------
 // wxGIFDecoder class
 // --------------------------------------------------------------------------
 

-// internal class for storing GIF image data
-class GIFImage
+class WXDLLIMPEXP_CORE wxGIFDecoder : public wxAnimationDecoder

 {
 public:
 {
 public:

-    // def ctor
-    GIFImage();
-
-    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 (-1 = unspecified) */
-    long delay;                     /* delay in ms (-1 = unused) */
-    unsigned char *p;               /* bitmap */
-    unsigned char *pal;             /* palette */
-    unsigned int ncolours;          /* number of colours */
-    GIFImage *next;                 /* next image */
-    GIFImage *prev;                 /* prev image */
-
-    DECLARE_NO_COPY_CLASS(GIFImage)
-};
+    // 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;

 
 

-class WXDLLEXPORT 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 */
-    GIFImage      *m_pimage;        /* pointer to current image */
-    GIFImage      *m_pfirst;        /* pointer to first image */
-    GIFImage      *m_plast;         /* pointer to last image */
+    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;

 
 

-    // 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[MAX_BLOCK_SIZE];     /* buffer for reading */
-    unsigned char *m_bufp;          /* pointer to next byte in buffer */
+    // 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();

 
 

-    // input stream
-    wxInputStream *m_f;             /* input stream */
+    // 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:
 
 private:

-    int getcode(int bits, int abfin);
-    int dgif(GIFImage *img, int interl, int bits);
+    // wxAnimationDecoder pure virtual
+    virtual bool DoCanRead( wxInputStream& stream ) const;
+        // modifies current stream position (see wxAnimationDecoder::CanRead)

 
 

-public:
-    // get data of current frame
-    int GetFrameIndex() const;
-    unsigned char* GetData() const;
-    unsigned char* GetPalette() const;
-    unsigned int GetNcolours() 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);
+    int getcode(wxInputStream& stream, int bits, int abfin);
+    wxGIFErrorCode dgif(wxInputStream& stream,
+                        GIFImage *img, int interl, int bits);

 
 

-public:
-    // constructor, destructor, etc.
-    wxGIFDecoder(wxInputStream *s, bool anim = false);
-    ~wxGIFDecoder();
-    bool CanRead();
-    int ReadGIF();
-    void Destroy();
+    
+    // array of all frames
+    wxArrayPtrVoid m_frames;

 
 

-    // convert current frame to wxImage
-    bool ConvertToImage(wxImage *image) const;
+    // 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

 
 

-    DECLARE_NO_COPY_CLASS(wxGIFDecoder)
+    wxDECLARE_NO_COPY_CLASS(wxGIFDecoder);

 };
 
 };
 

+#endif // wxUSE_STREAMS && wxUSE_GIF

 
 

-#endif  // wxUSE_STREAM && wxUSE_GIF
-#endif  // _WX_GIFDECOD_H
-
+#endif // _WX_GIFDECOD_H_