#define bigblankR_width 32
#define bigblankR_height 32
-static char bigblankR_bits[] = {
+static unsigned char bigblankR_bits[] = {
0xff,0xff,0xff,0x7f,0x01,0x00,0x00,0xc0,0x01,0x00,0x00,0xc0,0x01,0x00,0x00,
0xc0,0x01,0x00,0x00,0xc0,0x02,0x00,0x00,0x60,0x02,0x00,0x00,0x60,0x02,0x00,
0x00,0x60,0x02,0x00,0x00,0x60,0x04,0x00,0x00,0x30,0x04,0x00,0x00,0x30,0x04,