* Zero header before filling it. Colortype and potentially other fields

    were not properly initialized in non indexed files. Mantis #21840

git-svn-id: trunk@21638 -

packages/fcl-image/src/fpwritepng.pp

@@ -449,6 +449,7 @@ begin
   // signature for PNG
   TheStream.writeBuffer(Signature,sizeof(Signature));
   // Determine all settings for filling the header
+  fillchar(fheader,sizeof(fheader),#0);
   DetermineHeader (FHeader);
   // write the header chunk
   SetChunkLength (13);   // (sizeof(FHeader)); gives 14 and is wrong !!