From e739a9644cf2d4e39b45928dd9713427e45bb179 Mon Sep 17 00:00:00 2001
From: Travis Howell
Date: Wed, 30 Jul 2003 16:25:05 +0000
Subject: Fix Golum Ring causes graphic glitches, bug #777966

svn-id: r9294
---
 simon/vga.cpp | 38 +++++++++++++++++++++++++++-----------
 1 file changed, 27 insertions(+), 11 deletions(-)

diff --git a/simon/vga.cpp b/simon/vga.cpp
index c7b77953f9..12e0c06126 100644
--- a/simon/vga.cpp
+++ b/simon/vga.cpp
@@ -748,8 +748,6 @@ void SimonEngine::vc_10_draw() {
 
 		vc_10_skip_cols(&state);
 
-		/* XXX: implement transparency */
-
 		w = 0;
 		do {
 			mask = vc_10_depack_column(&state);	/* esi */
@@ -757,15 +755,33 @@ void SimonEngine::vc_10_draw() {
 			dst = state.surf_addr + w * 2;	/* edi */
 
 			h = state.draw_height;
-			do {
-				if (mask[0] & 0xF0)
-					dst[0] = src[0];
-				if (mask[0] & 0x0F)
-					dst[1] = src[1];
-				mask++;
-				dst += state.surf_pitch;
-				src += state.surf2_pitch;
-			} while (--h);
+			if (!(_game & GF_SIMON2) && vc_get_bit(88)) {
+				/* transparency */
+				do {
+					if (mask[0] & 0xF0) {
+						if ((dst[0] & 0x0F0) == 0x20)
+							dst[0] = src[0];
+					}
+					if (mask[0] & 0x0F) {
+						if ((dst[1] & 0x0F0) == 0x20)
+							dst[1] = src[1];
+					}
+					mask++;
+					dst += state.surf_pitch;
+					src += state.surf2_pitch;
+				} while (--h);
+			} else {
+				/* no transparency */
+				do {
+					if (mask[0] & 0xF0)
+						dst[0] = src[0];
+					if (mask[0] & 0x0F)
+						dst[1] = src[1];
+					mask++;
+					dst += state.surf_pitch;
+					src += state.surf2_pitch;
+				} while (--h);
+			}
 		} while (++w != state.draw_width);
 
 		/* vc_10_helper_5 */
-- 
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