Don't create multiple parent-less top level frames in layout sample.

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

diff --git a/include/wx/animdecod.h b/include/wx/animdecod.h
index eeae13b1ccb63f12c7b9d149e997d5729b04d2b7..876c802520099430dab4c3ab33cb79aec36fb2cd 100644 (file)
--- a/include/wx/animdecod.h
+++ b/include/wx/animdecod.h
@@ -12,11 +12,14 @@
 
 #include "wx/defs.h"
 
 
 #include "wx/defs.h"
 

-#if wxUSE_STREAMS && wxUSE_GIF
+#if wxUSE_STREAMS

 
 

-#include "wx/stream.h"
-#include "wx/image.h"

 #include "wx/colour.h"
 #include "wx/colour.h"

+#include "wx/gdicmn.h"
+#include "wx/log.h"
+#include "wx/stream.h"
+
+class WXDLLIMPEXP_FWD_CORE wxImage;

 
 /*
 
 
 /*
 


@@ -28,15 +31,15 @@
     wxAnimationDecoders always load an input stream using some optimized format
     to store it which is format-depedent. This allows to store a (possibly big)
     animation using a format which is a good compromise between required memory
     wxAnimationDecoders always load an input stream using some optimized format
     to store it which is format-depedent. This allows to store a (possibly big)
     animation using a format which is a good compromise between required memory

-    and time required to blit in on the screen.
+    and time required to blit it on the screen.

 
 

- 2) wxAnimationDecoders contain the animation data in some internal var.
+ 2) wxAnimationDecoders contain the animation data in some internal variable.

     That's why they derive from wxObjectRefData: they are data which can be shared.
 
  3) wxAnimationDecoders can be used by a wxImageHandler to retrieve a frame
     in wxImage format; the viceversa cannot be done.
 
     That's why they derive from wxObjectRefData: they are data which can be shared.
 
  3) wxAnimationDecoders can be used by a wxImageHandler to retrieve a frame
     in wxImage format; the viceversa cannot be done.
 

- 4) wxAnimationDecoders are decoders only, thus do not support save features.
+ 4) wxAnimationDecoders are decoders only, thus they do not support save features.

 
  5) wxAnimationDecoders are directly used by wxAnimation (generic implementation)
     as wxObjectRefData while they need to be 'wrapped' by a wxImageHandler for
 
  5) wxAnimationDecoders are directly used by wxAnimation (generic implementation)
     as wxObjectRefData while they need to be 'wrapped' by a wxImageHandler for


@@ -59,11 +62,11 @@ enum wxAnimationDisposal
     // Do not dispose. The graphic is to be left in place.
     wxANIM_DONOTREMOVE = 0,
 
     // Do not dispose. The graphic is to be left in place.
     wxANIM_DONOTREMOVE = 0,
 

-    // Restore to background color. The area used by the graphic must be 
+    // Restore to background color. The area used by the graphic must be

     // restored to the background color.
     wxANIM_TOBACKGROUND = 1,
 
     // restored to the background color.
     wxANIM_TOBACKGROUND = 1,
 

-    // Restore to previous. The decoder is required to restore the area 
+    // Restore to previous. The decoder is required to restore the area

     // overwritten by the graphic with what was there prior to rendering the graphic.
     wxANIM_TOPREVIOUS = 2
 };
     // overwritten by the graphic with what was there prior to rendering the graphic.
     wxANIM_TOPREVIOUS = 2
 };


@@ -82,59 +85,87 @@ enum wxAnimationType
 // wxAnimationDecoder class
 // --------------------------------------------------------------------------
 
 // wxAnimationDecoder class
 // --------------------------------------------------------------------------
 

-class WXDLLEXPORT wxAnimationDecoder : public wxObjectRefData
+class WXDLLIMPEXP_CORE wxAnimationDecoder : public wxObjectRefData

 {
 {

-protected:
-    wxSize m_szAnimation;
-    size_t m_nFrames;
+public:
+    wxAnimationDecoder()
+    {
+        m_nFrames = 0;
+    }

 
 

-    // this is the colour to use for the wxANIM_TOBACKGROUND disposal.
-    // if not specified by the animation, it's set to wxNullColour
-    wxColour m_background;
+    virtual bool Load( wxInputStream& stream ) = 0;
+
+    bool CanRead( wxInputStream& stream ) const
+    {
+        // NOTE: this code is the same of wxImageHandler::CallDoCanRead
+
+        if ( !stream.IsSeekable() )
+            return false;        // can't test unseekable stream
+
+        wxFileOffset posOld = stream.TellI();
+        bool ok = DoCanRead(stream);

 
 

-public:     // frame specific data getters
+        // restore the old position to be able to test other formats and so on
+        if ( stream.SeekI(posOld) == wxInvalidOffset )
+        {
+            wxLogDebug(wxT("Failed to rewind the stream in wxAnimationDecoder!"));
+
+            // reading would fail anyhow as we're not at the right position
+            return false;
+        }
+
+        return ok;
+    }
+
+    virtual wxAnimationDecoder *Clone() const = 0;
+    virtual wxAnimationType GetType() const = 0;
+
+    // convert given frame to wxImage
+    virtual bool ConvertToImage(unsigned int frame, wxImage *image) const = 0;
+
+
+    // frame specific data getters

 
     // not all frames may be of the same size; e.g. GIF allows to
     // specify that between two frames only a smaller portion of the
     // entire animation has changed.
 
     // not all frames may be of the same size; e.g. GIF allows to
     // specify that between two frames only a smaller portion of the
     // entire animation has changed.

-    virtual wxSize GetFrameSize(size_t frame) const = 0;
+    virtual wxSize GetFrameSize(unsigned int frame) const = 0;

 
     // the position of this frame in case it's not as big as m_szAnimation
     // or wxPoint(0,0) otherwise.
 
     // the position of this frame in case it's not as big as m_szAnimation
     // or wxPoint(0,0) otherwise.

-    virtual wxPoint GetFramePosition(size_t frame) const = 0;
+    virtual wxPoint GetFramePosition(unsigned int frame) const = 0;

 
     // what should be done after displaying this frame.
 
     // what should be done after displaying this frame.

-    virtual wxAnimationDisposal GetDisposalMethod(size_t frame) const = 0;
+    virtual wxAnimationDisposal GetDisposalMethod(unsigned int frame) const = 0;

 
     // the number of milliseconds this frame should be displayed.
     // if returns -1 then the frame must be displayed forever.
 
     // the number of milliseconds this frame should be displayed.
     // if returns -1 then the frame must be displayed forever.

-    virtual long GetDelay(size_t frame) const = 0;
+    virtual long GetDelay(unsigned int frame) const = 0;
+
+    // the transparent colour for this frame if any or wxNullColour.
+    virtual wxColour GetTransparentColour(unsigned int frame) const = 0;

 
     // get global data
     wxSize GetAnimationSize() const { return m_szAnimation; }
     wxColour GetBackgroundColour() const { return m_background; }
 
     // get global data
     wxSize GetAnimationSize() const { return m_szAnimation; }
     wxColour GetBackgroundColour() const { return m_background; }

-    size_t GetFrameCount() const { return m_nFrames; }
-
-public:
-    wxAnimationDecoder()
-    {
-        m_background = wxNullColour;
-        m_nFrames = 0;
-    }
-    ~wxAnimationDecoder() {}
-
+    unsigned int GetFrameCount() const { return m_nFrames; }

 
 

-    virtual bool Load( wxInputStream& stream ) = 0;
-    virtual bool CanRead( wxInputStream& stream ) const = 0;
+protected:
+    // checks the signature of the data in the given stream and returns true if it
+    // appears to be a valid animation format recognized by the animation decoder;
+    // this function should modify the stream current position without taking care
+    // of restoring it since CanRead() will do it.
+    virtual bool DoCanRead(wxInputStream& stream) const = 0;

 
 

-    virtual wxAnimationDecoder *Clone() const = 0;
-    virtual wxAnimationType GetType() const = 0;
+    wxSize m_szAnimation;
+    unsigned int m_nFrames;

 
 

-    // convert given frame to wxImage
-    virtual bool ConvertToImage(size_t frame, wxImage *image) const = 0;
+    // this is the colour to use for the wxANIM_TOBACKGROUND disposal.
+    // if not specified by the animation, it's set to wxNullColour
+    wxColour m_background;

 };
 
 };
 

+#endif  // wxUSE_STREAMS

 
 

-#endif  // wxUSE_STREAM && wxUSE_GIF

 #endif  // _WX_ANIMDECOD_H
 
 #endif  // _WX_ANIMDECOD_H