currently avoid problems when releasing the capture during drag on osx_cocoa

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

diff --git a/src/common/image.cpp b/src/common/image.cpp
index a3c94837675046e78b17694e0121b7dfc65a3628..4fb2b0c2548c79b7b698390783e09122580c6ea3 100644 (file)
--- a/src/common/image.cpp
+++ b/src/common/image.cpp
@@ -668,13 +668,13 @@ wxImage wxImage::ResampleBilinear(int width, int height) const
 
             //result lines
 
-            dst_data[0] = r1 * dy1 + r2 * dy;
-            dst_data[1] = g1 * dy1 + g2 * dy;
-            dst_data[2] = b1 * dy1 + b2 * dy;
+            dst_data[0] = static_cast<unsigned char>(r1 * dy1 + r2 * dy);
+            dst_data[1] = static_cast<unsigned char>(g1 * dy1 + g2 * dy);
+            dst_data[2] = static_cast<unsigned char>(b1 * dy1 + b2 * dy);
             dst_data += 3;
 
             if ( src_alpha )
-                *dst_alpha++ = a1 * dy1 + a2 * dy;
+                *dst_alpha++ = static_cast<unsigned char>(a1 * dy1 + a2 * dy);
         }
     }
 
@@ -1857,6 +1857,17 @@ void wxImage::InitAlpha()
     }
 }
 
+void wxImage::ClearAlpha()
+{
+    wxCHECK_RET( HasAlpha(), wxT("image already doesn't have an alpha channel") );
+
+    if ( !M_IMGDATA->m_staticAlpha )
+        free( M_IMGDATA->m_alpha );
+
+    M_IMGDATA->m_alpha = NULL;
+}
+
+
 // ----------------------------------------------------------------------------
 // mask support
 // ----------------------------------------------------------------------------
@@ -2341,8 +2352,6 @@ bool wxImage::DoLoad(wxImageHandler& handler, wxInputStream& stream, int index)
     if ( !handler.LoadFile(this, stream, true/*verbose*/, index) )
         return false;
 
-    M_IMGDATA->m_type = handler.GetType();
-
     // rescale the image to the specified size if needed
     if ( maxWidth || maxHeight )
     {
@@ -2363,6 +2372,9 @@ bool wxImage::DoLoad(wxImageHandler& handler, wxInputStream& stream, int index)
             Rescale(width, height, wxIMAGE_QUALITY_HIGH);
     }
 
+    // Set this after Rescale, which currently does not preserve it
+    M_IMGDATA->m_type = handler.GetType();
+
     return true;
 }