Cast RGB values to unsigned before packing

diff --git a/filter/rastertopclx.c b/filter/rastertopclx.c
index 39cb378bf99fb32fe75729b2a58382f26f4a3b23..4a687dd9d89c40d0abc55cb65cd08a4b5860dbe1 100644 (file)
--- a/filter/rastertopclx.c
+++ b/filter/rastertopclx.c
@@ -1377,8 +1377,8 @@ CompressData(unsigned char *line, // I - Data to compress
                // Pack 15-bit RGB difference...
                //
 
-               *comp_ptr++ = 0x80 | ((r << 2) & 0x7c) | ((g >> 3) & 0x03);
-               *comp_ptr++ = ((g << 5) & 0xe0) | (b & 0x1f);
+               *comp_ptr++ = 0x80 | (((unsigned)r << 2) & 0x7c) | ((g >> 3) & 0x03);
+*comp_ptr++ = (((unsigned)g << 5) & 0xe0) | (b & 0x1f);
              }
 
               count --;
@@ -1547,8 +1547,8 @@ CompressData(unsigned char *line, // I - Data to compress
                // Pack 15-bit RGB difference...
                //
 
-               *comp_ptr++ = 0x80 | ((r << 2) & 0x7c) | ((g >> 3) & 0x03);
-               *comp_ptr++ = ((g << 5) & 0xe0) | (b & 0x1f);
+               *comp_ptr++ = 0x80 | (((unsigned)r << 2) & 0x7c) | ((g >> 3) & 0x03);
+*comp_ptr++ = (((unsigned)g << 5) & 0xe0) | (b & 0x1f);
              }
 
               count --;