From abe08cd45765acb2e6196bf2c3b85d64fe9c7ebe Mon Sep 17 00:00:00 2001
From: morkt <muvluv.ru@gmail.com>
Date: Mon, 30 Nov 2015 03:41:20 +0400
Subject: [PATCH] (TgaStream): new static class.

create TGA image stream from the given image meta-data and pixels array.
---
 ArcFormats/ArcCommon.cs | 23 +++++++++++++++++++++--
 1 file changed, 21 insertions(+), 2 deletions(-)

diff --git a/ArcFormats/ArcCommon.cs b/ArcFormats/ArcCommon.cs
index 060ded7a..3182cd8d 100644
--- a/ArcFormats/ArcCommon.cs
+++ b/ArcFormats/ArcCommon.cs
@@ -23,12 +23,11 @@
 // IN THE SOFTWARE.
 //
 
+using GameRes.Utility;
 using System;
-using System.Collections.Generic;
 using System.IO;
 using System.Linq;
 using System.Security.Cryptography;
-using System.Text;
 
 namespace GameRes.Formats
 {
@@ -409,6 +408,26 @@ namespace GameRes.Formats
         }
     }
 
+    /// <summary>
+    /// Create stream in TGA format from the given image pixels.
+    /// </summary>
+    public static class TgaStream
+    {
+        public static Stream Create (ImageMetaData info, byte[] pixels, bool flipped = false)
+        {
+            var header = new byte[0x12];
+            header[2] = 2;
+            LittleEndian.Pack ((short)info.OffsetX, header, 8);
+            LittleEndian.Pack ((short)info.OffsetY, header, 0xa);
+            LittleEndian.Pack ((ushort)info.Width,  header, 0xc);
+            LittleEndian.Pack ((ushort)info.Height, header, 0xe);
+            header[0x10] = (byte)info.BPP;
+            if (!flipped)
+                header[0x11] = 0x20;
+            return new PrefixStream (header, new MemoryStream (pixels));
+        }
+    }
+
     public static class MMX
     {
         public static ulong PAddB (ulong x, ulong y)