From 93c6105442ae4b1598b9730d4384758c91695dbf Mon Sep 17 00:00:00 2001
From: Thomas Harte <thomas.harte@gmail.com>
Date: Sun, 9 Aug 2020 20:45:14 -0400
Subject: [PATCH] Corrects calculation of dirty texture area.

---
 OSBindings/Mac/Clock Signal/ScanTarget/CSScanTarget.mm | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/OSBindings/Mac/Clock Signal/ScanTarget/CSScanTarget.mm b/OSBindings/Mac/Clock Signal/ScanTarget/CSScanTarget.mm
index 8d8b2bc7b..d07d9e3f1 100644
--- a/OSBindings/Mac/Clock Signal/ScanTarget/CSScanTarget.mm	
+++ b/OSBindings/Mac/Clock Signal/ScanTarget/CSScanTarget.mm	
@@ -161,8 +161,8 @@ using BufferingScanTarget = Outputs::Display::BufferingScanTarget;
 
 	_scanTarget.perform([=] (const BufferingScanTarget::OutputArea &outputArea) {
 		// Ensure texture changes are noted.
-		const auto writeAreaModificationStart = size_t(outputArea.start.write_area_x + outputArea.start.write_area_y) * _bytesPerInputPixel;
-		const auto writeAreaModificationEnd = size_t(outputArea.end.write_area_x + outputArea.end.write_area_y) * _bytesPerInputPixel;
+		const auto writeAreaModificationStart = size_t(outputArea.start.write_area_x + outputArea.start.write_area_y * 2048) * _bytesPerInputPixel;
+		const auto writeAreaModificationEnd = size_t(outputArea.end.write_area_x + outputArea.end.write_area_y * 2048) * _bytesPerInputPixel;
 		if(writeAreaModificationStart != writeAreaModificationEnd) {
 			if(writeAreaModificationStart < writeAreaModificationEnd) {
 				[_writeAreaBuffer didModifyRange:NSMakeRange(writeAreaModificationStart, writeAreaModificationEnd - writeAreaModificationStart)];