From 8861cb4a3a355de554b9a2ea04b97fc1d5a7c0a6 Mon Sep 17 00:00:00 2001
From: Stephen Heumann <stephenheumann@gmail.com>
Date: Sat, 26 Sep 2015 00:33:08 -0500
Subject: [PATCH] Replace a few mod-by-power-of-2 operations with bit masking,
 since ORCA/C wasn't optimizing them

---
 mouse.cc | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/mouse.cc b/mouse.cc
index 472d005..7c6e1df 100644
--- a/mouse.cc
+++ b/mouse.cc
@@ -234,7 +234,7 @@ void DoCursor (void) {
           *(imageLine + n) ^= 0xFF;     /* Reverse color */
           *(imageLine + n) &= *(maskLine + n);
         }
-        if (rectWidth % 2) {
+        if (rectWidth & 0x01) {
           *(imageLine + n)  = coltab320[*(dataPtr++)] & 0xF0;
           *(imageLine + n) ^= 0xFF;     /* Reverse color */
           *(imageLine + n) &= *(maskLine + n);
@@ -270,9 +270,9 @@ void DoCursor (void) {
           *(imageLine + n) &= *(maskLine + n);
         }
         
-        if (rectWidth % 4) {
+        if (rectWidth & 0x03) {
             *(imageLine + n) = 0;
-            for (j = 0; j < rectWidth % 4; j++) {
+            for (j = 0; j < (rectWidth & 0x03); j++) {
                 *(imageLine + n) += coltab640[*(dataPtr++)] & (0xC0 >> j*2);
             }
             *(imageLine + n) ^= 0xFF;       /* Reverse color */