From d7ef626b42d2e669cac337dcf4e4c53cccdfad42 Mon Sep 17 00:00:00 2001
From: Max Horn
Date: Fri, 16 May 2003 00:11:35 +0000
Subject: fix advmame scaler ('flickering', observable in e.g. Sam&Max, and the
 left-screen-border-black bug). Note: this change might look fishy to you but
 is perfectly legal because our frame buffers put a border around the screen
 data to accomodate for this

svn-id: r7556
---
 common/scaler.cpp | 18 ++++++++++++------
 1 file changed, 12 insertions(+), 6 deletions(-)

(limited to 'common')

diff --git a/common/scaler.cpp b/common/scaler.cpp
index 96d25f3b3c..aef1d07ffe 100644
--- a/common/scaler.cpp
+++ b/common/scaler.cpp
@@ -726,9 +726,12 @@ void AdvMame2x(uint8 *srcPtr, uint32 srcPitch, uint8 *dstPtr, uint32 dstPitch,
 	uint16 G, H, I;
 
 	while (height--) {
-		B = C = *(p - nextlineSrc);
-		E = F = *(p);
-		H = I = *(p + nextlineSrc);
+		B = *(p - 1 - nextlineSrc);
+		E = *(p - 1);
+		H = *(p - 1 + nextlineSrc);
+		C = *(p - nextlineSrc);
+		F = *(p);
+		I = *(p + nextlineSrc);
 		for (int i = 0; i < width; ++i) {
 			p++;
 			A = B; B = C; C = *(p - nextlineSrc);
@@ -759,9 +762,12 @@ void AdvMame3x(uint8 *srcPtr, uint32 srcPitch, uint8 *dstPtr, uint32 dstPitch,
 	uint16 G, H, I;
 
 	while (height--) {
-		B = C = *(p - nextlineSrc);
-		E = F = *(p);
-		H = I = *(p + nextlineSrc);
+		B = *(p - 1 - nextlineSrc);
+		E = *(p - 1);
+		H = *(p - 1 + nextlineSrc);
+		C = *(p - nextlineSrc);
+		F = *(p);
+		I = *(p + nextlineSrc);
 		for (int i = 0; i < width; ++i) {
 			p++;
 			A = B; B = C; C = *(p - nextlineSrc);
-- 
cgit v1.2.3