added BytesPerPixel() method to PixelFormat structure

src/lol/gpu/texture.h

@@ -36,6 +36,22 @@ struct PixelFormat
     inline PixelFormat() : m_value(Unknown) {}
     inline PixelFormat(Value v) : m_value(v) {}
     inline operator Value() { return m_value; }
+
+    inline uint8_t BytesPerPixel()
+    {
+        switch (m_value)
+        {
+        case Y_8:
+            return 1;
+        case RGB_8:
+            return 3;
+        case RGBA_8:
+        case ARGB_8:
+        case ABGR_8:
+        default:
+            return 4;
+        }
+    }
 };
 
 class Texture

src/tileset.cpp

@@ -139,21 +139,8 @@ void TileSet::TickDraw(float seconds)
     }
     else if (m_data->m_image)
     {
-        int planes;
         PixelFormat format = m_data->m_image->GetFormat();
-
-        switch (format)
-        {
-        case PixelFormat::RGB_8:
-            planes = 3;
-            break;
-        case PixelFormat::RGBA_8:
-        case PixelFormat::ARGB_8:
-        case PixelFormat::ABGR_8:
-        default:
-            planes = 4;
-            break;
-        }
+        int planes = format.BytesPerPixel();
 
         int w = m_data->m_texture_size.x;
         int h = m_data->m_texture_size.y;