Allow creating wxGraphicsBitmap and wxGraphicsContext from wxImage.

[wxWidgets.git] / src / common / anidecod.cpp

diff --git a/src/common/anidecod.cpp b/src/common/anidecod.cpp
index e3b5ba4718755c0981ca4837323485dd1df082dc..d0d0b6d75bc7c034b17ac9a4e7573ab1714991eb 100644 (file)
--- a/src/common/anidecod.cpp
+++ b/src/common/anidecod.cpp
@@ -14,7 +14,7 @@
     #pragma hdrstop
 #endif
 
-#if wxUSE_STREAMS && wxUSE_GIF
+#if wxUSE_STREAMS && wxUSE_ICO_CUR
 
 #include "wx/anidecod.h"
 
@@ -35,10 +35,10 @@ wxCURHandler wxANIDecoder::sm_handler;
 class wxANIFrameInfo
 {
 public:
-    wxANIFrameInfo(size_t delay = 0, int idx = -1)
+    wxANIFrameInfo(unsigned int delay = 0, int idx = -1)
         { m_delay=delay; m_imageIndex=idx; }
 
-    size_t m_delay;
+    unsigned int m_delay;
     int m_imageIndex;
 };
 
@@ -61,9 +61,9 @@ wxANIDecoder::~wxANIDecoder()
 {
 }
 
-bool wxANIDecoder::ConvertToImage(size_t frame, wxImage *image) const
+bool wxANIDecoder::ConvertToImage(unsigned int frame, wxImage *image) const
 {
-    size_t idx = m_info[frame].m_imageIndex;
+    unsigned int idx = m_info[frame].m_imageIndex;
     *image = m_images[idx];       // copy
     return image->IsOk();
 }
@@ -73,38 +73,50 @@ bool wxANIDecoder::ConvertToImage(size_t frame, wxImage *image) const
 // Data accessors
 //---------------------------------------------------------------------------
 
-wxSize wxANIDecoder::GetFrameSize(size_t WXUNUSED(frame)) const
+wxSize wxANIDecoder::GetFrameSize(unsigned int WXUNUSED(frame)) const
 {
     // all frames are of the same size...
     return m_szAnimation;
 }
 
-wxPoint wxANIDecoder::GetFramePosition(size_t WXUNUSED(frame)) const
+wxPoint wxANIDecoder::GetFramePosition(unsigned int WXUNUSED(frame)) const
 {
     // all frames are of the same size...
     return wxPoint(0,0);
 }
 
-wxAnimationDisposal wxANIDecoder::GetDisposalMethod(size_t WXUNUSED(frame)) const
+wxAnimationDisposal wxANIDecoder::GetDisposalMethod(unsigned int WXUNUSED(frame)) const
 {
     // this disposal is implicit for all frames inside an ANI file
     return wxANIM_TOBACKGROUND;
 }
 
-long wxANIDecoder::GetDelay(size_t frame) const
+long wxANIDecoder::GetDelay(unsigned int frame) const
 {
     return m_info[frame].m_delay;
 }
 
+wxColour wxANIDecoder::GetTransparentColour(unsigned int frame) const
+{
+    unsigned int idx = m_info[frame].m_imageIndex;
+
+    if (!m_images[idx].HasMask())
+        return wxNullColour;
+
+    return wxColour(m_images[idx].GetMaskRed(),
+                    m_images[idx].GetMaskGreen(),
+                    m_images[idx].GetMaskBlue());
+}
+
 
 //---------------------------------------------------------------------------
 // ANI reading and decoding
 //---------------------------------------------------------------------------
 
-bool wxANIDecoder::CanRead(wxInputStream& stream) const
+bool wxANIDecoder::DoCanRead(wxInputStream& stream) const
 {
     wxInt32 FCC1, FCC2;
-    wxUint32 datalen ;
+    wxUint32 datalen;
 
     wxInt32 riff32;
     memcpy( &riff32, "RIFF", 4 );
@@ -115,7 +127,11 @@ bool wxANIDecoder::CanRead(wxInputStream& stream) const
     wxInt32 anih32;
     memcpy( &anih32, "anih", 4 );
 
-    stream.SeekI(0);
+    if ( stream.IsSeekable() && stream.SeekI(0) == wxInvalidOffset )
+    {
+        return false;
+    }
+
     if ( !stream.Read(&FCC1, 4) )
         return false;
 
@@ -142,7 +158,8 @@ bool wxANIDecoder::CanRead(wxInputStream& stream) const
         }
         else
         {
-            stream.SeekI(stream.TellI() + datalen);
+            if ( stream.SeekI(stream.TellI() + datalen) == wxInvalidOffset )
+                return false;
         }
 
         // try to read next data chunk:
@@ -193,7 +210,7 @@ bool wxANIDecoder::Load( wxInputStream& stream )
 {
     wxInt32 FCC1, FCC2;
     wxUint32 datalen;
-    size_t globaldelay=0;
+    unsigned int globaldelay=0;
 
     wxInt32 riff32;
     memcpy( &riff32, "RIFF", 4 );
@@ -208,8 +225,13 @@ bool wxANIDecoder::Load( wxInputStream& stream )
     wxInt32 seq32;
     memcpy( &seq32, "seq ", 4 );
 
-    stream.SeekI(0);
-    stream.Read(&FCC1, 4);
+    if ( stream.IsSeekable() && stream.SeekI(0) == wxInvalidOffset )
+    {
+        return false;
+    }
+
+    if ( !stream.Read(&FCC1, 4) )
+        return false;
     if ( FCC1 != riff32 )
         return false;
 
@@ -220,10 +242,12 @@ bool wxANIDecoder::Load( wxInputStream& stream )
     m_info.Clear();
 
     // we have a riff file:
-    while ( stream.IsOk() )
+    while ( !stream.Eof() )
     {
         // we always have a data size:
-        stream.Read(&datalen, 4);
+        if (!stream.Read(&datalen, 4))
+            return false;
+
         datalen = wxINT32_SWAP_ON_BE(datalen);
 
         //data should be padded to make even number of bytes
@@ -232,7 +256,8 @@ bool wxANIDecoder::Load( wxInputStream& stream )
         // now either data or a FCC:
         if ( (FCC1 == riff32) || (FCC1 == list32) )
         {
-            stream.Read(&FCC2, 4);
+            if (!stream.Read(&FCC2, 4))
+                return false;
         }
         else if ( FCC1 == anih32 )
         {
@@ -243,7 +268,8 @@ bool wxANIDecoder::Load( wxInputStream& stream )
                 return false;       // already parsed an ani header?
 
             struct wxANIHeader header;
-            stream.Read(&header, sizeof(wxANIHeader));
+            if (!stream.Read(&header, sizeof(wxANIHeader)))
+                return false;
             header.AdjustEndianness();
 
             // we should have a global frame size
@@ -266,9 +292,10 @@ bool wxANIDecoder::Load( wxInputStream& stream )
                 return false;       // rate chunks should always be placed after anih chunk
 
             wxASSERT(m_info.GetCount() == m_nFrames);
-            for (size_t i=0; i<m_nFrames; i++)
+            for (unsigned int i=0; i<m_nFrames; i++)
             {
-                stream.Read(&FCC2, 4);
+                if (!stream.Read(&FCC2, 4))
+                    return false;
                 m_info[i].m_delay = wxINT32_SWAP_ON_BE(FCC2) * 1000 / 60;
             }
         }
@@ -279,9 +306,10 @@ bool wxANIDecoder::Load( wxInputStream& stream )
                 return false;       // seq chunks should always be placed after anih chunk
 
             wxASSERT(m_info.GetCount() == m_nFrames);
-            for (size_t i=0; i<m_nFrames; i++)
+            for (unsigned int i=0; i<m_nFrames; i++)
             {
-                stream.Read(&FCC2, 4);
+                if (!stream.Read(&FCC2, 4))
+                    return false;
                 m_info[i].m_imageIndex = wxINT32_SWAP_ON_BE(FCC2);
             }
         }
@@ -292,15 +320,23 @@ bool wxANIDecoder::Load( wxInputStream& stream )
             if (!sm_handler.DoLoadFile(&image, stream, false /* verbose */, -1))
                 return false;
 
+            image.SetType(wxBITMAP_TYPE_ANI);
             m_images.Add(image);
         }
         else
         {
-            stream.SeekI(stream.TellI() + datalen);
+            if ( stream.SeekI(stream.TellI() + datalen) == wxInvalidOffset )
+                return false;
         }
 
         // try to read next data chunk:
-        stream.Read(&FCC1, 4);
+        if ( !stream.Read(&FCC1, 4) && !stream.Eof())
+        {
+            // we didn't reach the EOF! An other kind of error has occurred...
+            return false;
+        }
+        //else: proceed with the parsing of the next header block or
+        //      exiting this loop (if stream.Eof() == true)
     }
 
     if (m_nFrames==0)
@@ -310,14 +346,14 @@ bool wxANIDecoder::Load( wxInputStream& stream )
     {
         // if no SEQ chunk is available, display the frames in the order
         // they were loaded
-        for (size_t i=0; i<m_nFrames; i++)
+        for (unsigned int i=0; i<m_nFrames; i++)
             if (m_info[i].m_imageIndex == -1)
                 m_info[i].m_imageIndex = i;
     }
 
     // if some frame has an invalid delay, use the global delay given in the
     // ANI header
-    for (size_t i=0; i<m_nFrames; i++)
+    for (unsigned int i=0; i<m_nFrames; i++)
         if (m_info[i].m_delay == 0)
             m_info[i].m_delay = globaldelay;
 
@@ -330,4 +366,4 @@ bool wxANIDecoder::Load( wxInputStream& stream )
     return m_szAnimation != wxDefaultSize;
 }
 
-#endif // wxUSE_STREAMS && wxUSE_GIF
+#endif // wxUSE_STREAMS && wxUSE_ICO_CUR