implemented PNA containers (#17).

ArcFormats/Will/ArcPNA.cs

@@ -0,0 +1,117 @@
+//! \file       ArcPNA.cs
+//! \date       Wed Feb 17 23:02:21 2016
+//! \brief      Pulltop multi-frame image.
+//
+// Copyright (C) 2016 by morkt
+//
+// Permission is hereby granted, free of charge, to any person obtaining a copy
+// of this software and associated documentation files (the "Software"), to
+// deal in the Software without restriction, including without limitation the
+// rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
+// sell copies of the Software, and to permit persons to whom the Software is
+// furnished to do so, subject to the following conditions:
+//
+// The above copyright notice and this permission notice shall be included in
+// all copies or substantial portions of the Software.
+//
+// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+// FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
+// IN THE SOFTWARE.
+//
+
+using System.Collections.Generic;
+using System.ComponentModel.Composition;
+using System.IO;
+using System.Windows.Media;
+using System.Windows.Media.Imaging;
+
+namespace GameRes.Formats.Will
+{
+    internal class PnaEntry : ImageEntry
+    {
+        public ImageMetaData    Info;
+    }
+
+    [Export(typeof(ArchiveFormat))]
+    public class PnaOpener : ArchiveFormat
+    {
+        public override string         Tag { get { return "PNA"; } }
+        public override string Description { get { return "Pulltop multi-frame image format"; } }
+        public override uint     Signature { get { return 0x50414E50; } } // 'PNAP'
+        public override bool  IsHierarchic { get { return false; } }
+        public override bool     CanCreate { get { return false; } }
+
+        public override ArcFile TryOpen (ArcView file)
+        {
+            int count = file.View.ReadInt32 (0x10);
+            if (!IsSaneCount (count))
+                return null;
+
+            var base_name = Path.GetFileNameWithoutExtension (file.Name);
+            uint index_offset = 0x14;
+            uint current_offset = index_offset + (uint)count*0x28;
+            var dir = new List<Entry> (count);
+            for (int i = 0; i < count; ++i)
+            {
+                uint size = file.View.ReadUInt32 (index_offset+0x24);
+                if (size > 0)
+                {
+                    var imginfo = new ImageMetaData {
+                        OffsetX = file.View.ReadInt32 (index_offset+8),
+                        OffsetY = file.View.ReadInt32 (index_offset+0xC),
+                        Width   = file.View.ReadUInt32 (index_offset+0x10),
+                        Height  = file.View.ReadUInt32 (index_offset+0x14),
+                        BPP     = 32,
+                    };
+                    var entry = new PnaEntry {
+                        Name    = string.Format ("{0}#{1:D3}.tga", base_name, i),
+                        Size    = size,
+                        Offset  = current_offset,
+                        Info    = imginfo,
+                    };
+                    if (!entry.CheckPlacement (file.MaxOffset))
+                        return null;
+                    dir.Add (entry);
+                    current_offset += entry.Size;
+                }
+                index_offset += 0x28;
+            }
+            return new ArcFile (file, this, dir);
+        }
+
+        public override Stream OpenEntry (ArcFile arc, Entry entry)
+        {
+            var pent = entry as PnaEntry;
+            if (null == pent)
+                return base.OpenEntry (arc, entry);
+            ImageData image;
+            using (var input = arc.File.CreateStream (entry.Offset, entry.Size))
+                image = ImageFormat.Read (input);
+            var bitmap = image.Bitmap;
+            if (bitmap.Format.BitsPerPixel != 32)
+            {
+                bitmap = new FormatConvertedBitmap (bitmap, PixelFormats.Bgra32, null, 0);
+            }
+            int stride = bitmap.PixelWidth * 4;
+            var pixels = new byte[stride * bitmap.PixelHeight];
+            bitmap.CopyPixels (pixels, stride, 0);
+
+            // restore colors premultiplied by alpha
+            for (int i = 0; i < pixels.Length; i += 4)
+            {
+                int alpha = pixels[i+3];
+                if (alpha != 0 && alpha != 0xFF)
+                {
+                    pixels[i]   = (byte)(pixels[i]   * 0xFF / alpha);
+                    pixels[i+1] = (byte)(pixels[i+1] * 0xFF / alpha);
+                    pixels[i+2] = (byte)(pixels[i+2] * 0xFF / alpha);
+                }
+            }
+            return TgaStream.Create (pent.Info, pixels);
+        }
+    }
+}