From e21ea9331909adb03e7b55fd91c26b2b9d186a77 Mon Sep 17 00:00:00 2001
From: Bart Trzynadlowski <bart.trzy@gmail.com>
Date: Wed, 7 Sep 2016 01:25:27 +0000
Subject: [PATCH] Added RGBA4 format to BMP file writer

---
 Src/Util/BMPFile.h | 23 ++++++++++++++++++++++-
 1 file changed, 22 insertions(+), 1 deletion(-)

diff --git a/Src/Util/BMPFile.h b/Src/Util/BMPFile.h
index 8f3b2cd..aa1dc80 100644
--- a/Src/Util/BMPFile.h
+++ b/Src/Util/BMPFile.h
@@ -113,7 +113,28 @@ namespace Util
       return uint8_t((255.0f / 1.0f) * float((*reinterpret_cast<const uint16_t *>(pixel) >> 15) & 0x1));
     }
   };
-  
+
+  struct RGBA4
+  {
+    static const unsigned bytes_per_pixel = 2;
+    static inline uint8_t GetRed(const uint8_t *pixel)
+    {
+      return uint8_t((255.0f / 15.0f) * float((*reinterpret_cast<const uint16_t *>(pixel) >> 12) & 0xf));
+    }
+    static inline uint8_t GetGreen(const uint8_t *pixel)
+    {
+      return uint8_t((255.0f / 15.0f) * float((*reinterpret_cast<const uint16_t *>(pixel) >> 8) & 0xf));
+    }
+    static inline uint8_t GetBlue(const uint8_t *pixel)
+    {
+      return uint8_t((255.0f / 15.0f) * float((*reinterpret_cast<const uint16_t *>(pixel) >> 4) & 0xf));
+    }
+    static inline uint8_t GetAlpha(const uint8_t *pixel)
+    {
+      return uint8_t((255.0f / 15.0f) * float((*reinterpret_cast<const uint16_t *>(pixel) >> 0) & 0xf));
+    }
+  };
+
   template <class SurfaceFormat>
   static bool WriteSurfaceToBMP(const std::string &file_name, const uint8_t *pixels, int32_t width, int32_t height, bool flip_vertical)
   {