From f01f4909b472ceaa427525aded10e8ee29cbf740 Mon Sep 17 00:00:00 2001
From: morkt <muvluv.ru@gmail.com>
Date: Thu, 19 Jan 2017 23:46:23 +0400
Subject: [PATCH] (CHR): use overlay alpha channel.

---
 ArcFormats/GameSystem/ArcCHR.cs   | 5 +++--
 ArcFormats/GameSystem/ImageCHR.cs | 4 +---
 2 files changed, 4 insertions(+), 5 deletions(-)

diff --git a/ArcFormats/GameSystem/ArcCHR.cs b/ArcFormats/GameSystem/ArcCHR.cs
index ee7ed26e..4d1c026e 100644
--- a/ArcFormats/GameSystem/ArcCHR.cs
+++ b/ArcFormats/GameSystem/ArcCHR.cs
@@ -133,8 +133,9 @@ namespace GameRes.Formats.GameSystem
             int stride = (int)Info.Width * 4;
             var pixels = new byte[stride * (int)Info.Height];
             m_input.Read (pixels, 0, pixels.Length);
-            return ImageData.CreateFlipped (Info, PixelFormats.Bgr32, null, pixels, stride);
-
+            for (int i = 3; i < pixels.Length; i += 4)
+                pixels[i] = (byte)(pixels[i] * 0xFF / 0x80);
+            return ImageData.CreateFlipped (Info, PixelFormats.Bgra32, null, pixels, stride);
         }
     }
 }
diff --git a/ArcFormats/GameSystem/ImageCHR.cs b/ArcFormats/GameSystem/ImageCHR.cs
index ffe5b621..cf3f196f 100644
--- a/ArcFormats/GameSystem/ImageCHR.cs
+++ b/ArcFormats/GameSystem/ImageCHR.cs
@@ -181,9 +181,7 @@ namespace GameRes.Formats.GameSystem
                 {
                     m_input.Read (m_output, dst, 3);
                     int a = m_input.ReadByte();
-                    if (a != 0x80)
-                        throw new InvalidFormatException ("Error reading overlay frame");
-                    m_output[dst+3] = 0xFF;
+                    m_output[dst+3] = (byte)(a * 0xFF / 0x80);
                     dst += 4;
                 }
                 output += m_stride;