Remove unused code for saving embedded RGB map images

Only embedded images in RGBA format are loaded anymore, so the additional code for converting RGB to RGBA image data is not necessary.

src/game/editor/mapitems/map_io.cpp

@@ -111,27 +111,8 @@ bool CEditorMap::Save(const char *pFileName)
 		}
 		else
 		{
-			const size_t PixelSize = CImageInfo::PixelSize(CImageInfo::FORMAT_RGBA);
-			const size_t DataSize = (size_t)Item.m_Width * Item.m_Height * PixelSize;
-			if(pImg->m_Format == CImageInfo::FORMAT_RGB)
-			{
-				// Convert to RGBA
-				unsigned char *pDataRGBA = (unsigned char *)malloc(DataSize);
-				unsigned char *pDataRGB = (unsigned char *)pImg->m_pData;
-				for(int j = 0; j < Item.m_Width * Item.m_Height; j++)
-				{
-					pDataRGBA[j * PixelSize] = pDataRGB[j * 3];
-					pDataRGBA[j * PixelSize + 1] = pDataRGB[j * 3 + 1];
-					pDataRGBA[j * PixelSize + 2] = pDataRGB[j * 3 + 2];
-					pDataRGBA[j * PixelSize + 3] = 255;
-				}
-				Item.m_ImageData = Writer.AddData(DataSize, pDataRGBA);
-				free(pDataRGBA);
-			}
-			else
-			{
-				Item.m_ImageData = Writer.AddData(DataSize, pImg->m_pData);
-			}
+			dbg_assert(pImg->m_Format == CImageInfo::FORMAT_RGBA, "Embedded images must be in RGBA format");
+			Item.m_ImageData = Writer.AddData(pImg->DataSize(), pImg->m_pData);
 		}
 		Writer.AddItem(MAPITEMTYPE_IMAGE, i, sizeof(Item), &Item);
 	}