X-Git-Url: https://git.saurik.com/wxWidgets.git/blobdiff_plain/a24b341aea75b8fc45356601d48ffd18ad94e92c..eea4d01c65f9b29baa1193db762b4c6b8144af24:/src/msw/dib.cpp

diff --git a/src/msw/dib.cpp b/src/msw/dib.cpp
index da8b42d1fc..4eff321612 100644
--- a/src/msw/dib.cpp
+++ b/src/msw/dib.cpp
@@ -660,7 +660,7 @@ wxPalette *wxDIB::CreatePalette() const
 
 bool wxDIB::Create(const wxImage& image, PixelFormat pf)
 {
-    wxCHECK_MSG( image.Ok(), false, wxT("invalid wxImage in wxDIB ctor") );
+    wxCHECK_MSG( image.IsOk(), false, wxT("invalid wxImage in wxDIB ctor") );
 
     const int h = image.GetHeight();
     const int w = image.GetWidth();
@@ -753,14 +753,21 @@ wxImage wxDIB::ConvertToImage() const
     const int w = GetWidth();
     const int h = GetHeight();
     wxImage image(w, h, false /* don't bother clearing memory */);
-    if ( !image.Ok() )
+    if ( !image.IsOk() )
     {
         wxFAIL_MSG( wxT("could not allocate data for image") );
         return wxNullImage;
     }
 
     const int bpp = GetDepth();
+
+    // Remember if we have any "real" transparency, i.e. either any partially
+    // transparent pixels or not all pixels are fully opaque or fully
+    // transparent.
     bool hasAlpha = false;
+    bool hasOpaque = false;
+    bool hasTransparent = false;
+
     if ( bpp == 32 )
     {
         // 32 bit bitmaps may be either 0RGB or ARGB and we don't know in
@@ -793,13 +800,30 @@ wxImage wxDIB::ConvertToImage() const
                 // premultiplication done in Create() above
                 const unsigned char a = *src;
                 *alpha++ = a;
+
+                // Check what kind of alpha do we have.
+                switch ( a )
+                {
+                    case 0:
+                        hasTransparent = true;
+                        break;
+
+                    default:
+                        // Anything in between means we have real transparency
+                        // and must use alpha channel.
+                        hasAlpha = true;
+                        break;
+
+                    case 255:
+                        hasOpaque = true;
+                        break;
+                }
+
                 if ( a > 0 )
                 {
                     dst[0] = (dst[0] * 255) / a;
                     dst[1] = (dst[1] * 255) / a;
                     dst[2] = (dst[2] * 255) / a;
-
-                    hasAlpha = true;
                 }
 
                 src++;
@@ -817,6 +841,9 @@ wxImage wxDIB::ConvertToImage() const
         srcLineStart += srcBytesPerLine;
     }
 
+    if ( hasOpaque && hasTransparent )
+        hasAlpha = true;
+
     if ( !hasAlpha && image.HasAlpha() )
         image.ClearAlpha();