* Fix from Ocean for reading PNG (26538)

git-svn-id: trunk@30290 -

packages/fcl-image/src/fpreadpng.pp

@@ -403,20 +403,24 @@ end;
 function TFPReaderPNG.CalcColor: TColorData;
 var cd : longword;
     r : word;
-    b : byte;
-    tmp : pbytearray;
+    b : pbyte;
 begin
   if UsingBitGroup = 0 then
     begin
     Databytes := 0;
     if Header.BitDepth = 16 then
       begin
-       getmem(tmp, bytewidth);
-       fillchar(tmp^, bytewidth, 0);
-       for r:=0 to bytewidth-2 do
-        tmp^[r+1]:=FCurrentLine^[Dataindex+r];
-       move (tmp^[0], Databytes, bytewidth);
-       freemem(tmp);
+        b := @Databytes;
+        b^ := 0;
+        r := 0;
+        while (r < ByteWidth-1) do
+        begin
+          b^ := FCurrentLine^[DataIndex+r+1];
+          inc (b);
+          b^ := FCurrentLine^[DataIndex+r];
+          inc (b);
+          inc (r,2);
+        end;
       end
     else move (FCurrentLine^[DataIndex], Databytes, bytewidth);
     {$IFDEF ENDIAN_BIG}