minor refactoring of menu UpdateUI handling

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

diff --git a/src/common/imaggif.cpp b/src/common/imaggif.cpp
index b8a5229e2343eac696fbafb7e895d1ff03451b2b..19b164b1b20720e10213715b32c10b7994252901 100644 (file)
--- a/src/common/imaggif.cpp
+++ b/src/common/imaggif.cpp
@@ -7,10 +7,6 @@
 // Licence:     wxWindows licence
 /////////////////////////////////////////////////////////////////////////////
 
-#ifdef __GNUG__
-#pragma implementation "imaggif.h"
-#endif
-
 // For compilers that support precompilation, includes "wx.h".
 #include "wx/wxprec.h"
 
@@ -38,14 +34,15 @@ IMPLEMENT_DYNAMIC_CLASS(wxGIFHandler,wxImageHandler)
 
 #if wxUSE_STREAMS
 
-bool wxGIFHandler::LoadFile( wxImage *image, wxInputStream& stream, bool verbose, int WXUNUSED(index) )
+bool wxGIFHandler::LoadFile(wxImage *image, wxInputStream& stream,
+                            bool verbose, int index)
 {
     wxGIFDecoder *decod;
     int error;
-    bool ok;
+    bool ok = true;
 
 //    image->Destroy();
-    decod = new wxGIFDecoder(&stream, TRUE);
+    decod = new wxGIFDecoder(&stream, true);
     error = decod->ReadGIF();
 
     if ((error != wxGIF_OK) && (error != wxGIF_TRUNCATED))
@@ -66,7 +63,7 @@ bool wxGIFHandler::LoadFile( wxImage *image, wxInputStream& stream, bool verbose
             }
         }
         delete decod;
-        return FALSE;
+        return false;
     }
 
     if ((error == wxGIF_TRUNCATED) && verbose)
@@ -75,7 +72,30 @@ bool wxGIFHandler::LoadFile( wxImage *image, wxInputStream& stream, bool verbose
         /* go on; image data is OK */
     }
 
-    ok = decod->ConvertToImage(image);
+    if (index != -1)
+    {
+        // We're already on index = 0 by default. So no need
+        // to call GoFrame(0) then. On top of that GoFrame doesn't
+        // accept an index of 0. (Instead GoFirstFrame() should be used)
+        // Also if the gif image has only one frame, calling GoFrame(0)
+        // fails because GoFrame() only works with gif animations.
+        // (It fails if IsAnimation() returns false)
+        // All valid reasons to NOT call GoFrame when index equals 0.
+        if (index != 0)
+        {
+            ok = decod->GoFrame(index);
+        }
+    }
+
+    if (ok)
+    {
+        ok = decod->ConvertToImage(image);
+    }
+    else
+    {
+        wxLogError(_("GIF: Invalid gif index."));
+    }
+
     delete decod;
 
     return ok;
@@ -87,19 +107,13 @@ bool wxGIFHandler::SaveFile( wxImage * WXUNUSED(image),
     if (verbose)
         wxLogDebug(wxT("GIF: the handler is read-only!!"));
 
-    return FALSE;
+    return false;
 }
 
 bool wxGIFHandler::DoCanRead( wxInputStream& stream )
 {
-    wxGIFDecoder *decod;
-    bool ok;
-
-    decod = new wxGIFDecoder(&stream);
-    ok = decod->CanRead();
-    delete decod;
-
-    return ok;
+    wxGIFDecoder decod(&stream);
+    return decod.CanRead();
 }
 
 #endif  // wxUSE_STREAMS