From a42b6e536743ca4a49e24d5d20528ce061dfd213 Mon Sep 17 00:00:00 2001
From: Asvel <fe.asvel@gmail.com>
Date: Sun, 23 Feb 2025 20:28:09 +0800
Subject: [PATCH] fix image compatibility under Firefox

---
 client/StaticData.cs | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/client/StaticData.cs b/client/StaticData.cs
index 7453575..656012d 100644
--- a/client/StaticData.cs
+++ b/client/StaticData.cs
@@ -13,11 +13,17 @@ internal class StaticData
     {
         public static readonly JsonSerializerOptions JsonOptions = new() { Encoder = JavaScriptEncoder.UnsafeRelaxedJsonEscaping };
         public static readonly byte[] BmpHeader = [
-            0x42, 0x4D, 0x46, 0x19, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x46, 0x00, 0x00, 0x00, 0x38, 0x00,
+            0x42, 0x4D, 0x7A, 0x19, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x7A, 0x00, 0x00, 0x00, 0x6C, 0x00,
             0x00, 0x00, 0x28, 0x00, 0x00, 0x00, 0xD8, 0xFF, 0xFF, 0xFF, 0x01, 0x00, 0x20, 0x00, 0x03, 0x00,
             0x00, 0x00, 0x00, 0x19, 0x00, 0x00, 0x60, 0x09, 0x00, 0x00, 0x60, 0x09, 0x00, 0x00, 0x00, 0x00,
             0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0xFF, 0x00, 0x00, 0xFF, 0x00, 0x00, 0xFF, 0x00,
             0x00, 0x00, 0x00, 0x00, 0x00, 0xFF,
+            // Firefox 不支持只带 alpha mask 不带后续 color space 内容的 DIB header，加个无效的 bV4CSType=-1 哄哄它
+            // https://hg.mozilla.org/mozilla-central/file/tip/image/decoders/nsBMPDecoder.cpp
+            0xFF, 0xFF, 0xFF, 0xFF, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+            0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+            0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+            0x00, 0x00, 0x00, 0x00, 
         ];
 
         public readonly Dictionary<string, byte[]> Jsons = [];