another variation of PGD images.

ArcFormats/Softpal/ImagePGD.cs

@@ -178,7 +178,7 @@ namespace GameRes.Formats.Softpal
 
         public override ImageData Read (Stream stream, ImageMetaData info)
         {
-            using (var tga = new StreamRegion (stream, 0x18))
+            using (var tga = new StreamRegion (stream, 0x18, true))
                 return base.Read (tga, info);
         }
 
@@ -188,12 +188,65 @@ namespace GameRes.Formats.Softpal
         }
     }
 
+    internal class PgdGeMetaData : ImageMetaData
+    {
+        public int  Method;
+    }
+
+    [Export(typeof(ImageFormat))]
+    public class PgdGeFormat : ImageFormat
+    {
+        public override string         Tag { get { return "PGD/GE"; } }
+        public override string Description { get { return "Image format used by Softpal subsidiaries"; } }
+        public override uint     Signature { get { return 0x204547; } } // 'GE '
+
+        public PgdGeFormat ()
+        {
+            Extensions = new string[] { "pgd" };
+        }
+
+        public override ImageMetaData ReadMetaData (Stream stream)
+        {
+            var header = new byte[0x20];
+            if (header.Length != stream.Read (header, 0, header.Length))
+                return null;
+            return new PgdGeMetaData
+            {
+                Width   = LittleEndian.ToUInt32 (header, 0x0C),
+                Height  = LittleEndian.ToUInt32 (header, 0x10),
+                OffsetX = LittleEndian.ToInt32 (header, 4),
+                OffsetY = LittleEndian.ToInt32 (header, 8),
+                BPP     = 32,
+                Method  = LittleEndian.ToUInt16 (header, 0x1C),
+            };
+        }
+
+        public override ImageData Read (Stream stream, ImageMetaData info)
+        {
+            stream.Position = 0x20;
+            using (var reader = new PgdReader (stream, (PgdGeMetaData)info))
+            {
+                var pixels = reader.UnpackGE();
+                return ImageData.Create (info, reader.Format, null, pixels);
+            }
+        }
+
+        public override void Write (Stream file, ImageData image)
+        {
+            throw new NotImplementedException ("PgdGeFormat.Write not implemented");
+        }
+    }
+
     internal sealed class PgdReader : IDisposable
     {
         BinaryReader        m_input;
         byte[]              m_output;
+        int                 m_width;
+        int                 m_height;
+        int                 m_method;
 
-        public byte[] Data { get { return m_output; } }
+        public byte[]        Data { get { return m_output; } }
+        public PixelFormat Format { get; private set; }
 
         public PgdReader (Stream input, int position)
         {
@@ -204,6 +257,25 @@ namespace GameRes.Formats.Softpal
             m_output = new byte[unpacked_size];
         }
 
+        public PgdReader (Stream input, PgdGeMetaData info) : this (input, 0x20)
+        {
+            m_width = (int)info.Width;
+            m_height = (int)info.Height;
+            m_method = info.Method;
+        }
+
+        public byte[] UnpackGE ()
+        {
+            UnpackGePre();
+            switch (m_method)
+            {
+            case 1: return PostProcess1 (m_output);
+            case 2: return PostProcess2 (m_output);
+            case 3: return PostProcess3 (m_output);
+            default: throw new NotSupportedException ("Not supported PGD compression");
+            }
+        }
+
         public byte[] Unpack00 ()
         {
             return Unpack (3000);
@@ -244,6 +316,168 @@ namespace GameRes.Formats.Softpal
             return m_output;
         }
 
+        byte[] UnpackGePre ()
+        {
+            int dst = 0;
+            int ctl = 2;
+            while (dst < m_output.Length)
+            {
+                ctl >>= 1;
+                if (1 == ctl)
+                    ctl = m_input.ReadByte() | 0x100;
+                int count;
+                if (0 != (ctl & 1))
+                {
+                    int offset = m_input.ReadUInt16();
+                    if (0 != (offset & 8))
+                    {
+                        count = (offset & 7) + 4;
+                    }
+                    else
+                    {
+                        count = ((offset & 7) << 8 | m_input.ReadByte()) + 4;
+                    }
+                    offset >>= 4;
+                    Binary.CopyOverlapped (m_output, dst - offset, dst, count);
+                }
+                else
+                {
+                    count = m_input.ReadByte();
+                    m_input.Read (m_output, dst, count);
+                }
+                dst += count;
+            }
+            return m_output;
+        }
+
+        byte[] PostProcess1 (byte[] input)
+        {
+            Format = PixelFormats.Bgra32;
+            var output = new byte[input.Length];
+            int plane_size = input.Length / 4;
+            int a_src = 0;
+            int r_src = plane_size;
+            int g_src = 2 * plane_size;
+            int b_src = 3 * plane_size;
+            int dst = 0;
+            for (int i = 0; i < plane_size; ++i)
+            {
+                output[dst++] = input[b_src+i];
+                output[dst++] = input[g_src+i];
+                output[dst++] = input[r_src+i];
+                output[dst++] = input[a_src+i];
+            }
+            return output;
+        }
+
+        byte[] PostProcess2 (byte[] input)
+        {
+            Format = PixelFormats.Bgr24;
+            int stride = m_width * 3;
+
+            int segment_size = m_width * m_height / 4;
+            int src0 = 0;
+            int src1 = segment_size;
+            int src2 = segment_size + src1;
+
+            var output = new byte[stride * m_height];
+            int dst = 0;
+
+            int[] points = { 0, 1, m_width, m_width + 1 };
+            for (int y = m_height / 2; y > 0; --y)
+            {
+                for (int x = m_width / 2; x > 0; --x)
+                {
+                    sbyte i0 = (sbyte)input[src0];
+                    sbyte i1 = (sbyte)input[src1];
+                    int b = 226 * i0;
+                    int g = -43 * i0 - 89 * i1;
+                    int r = 179 * i1;
+                    ++src0;
+                    ++src1;
+                    for (int i = 0; i < points.Length; ++i)
+                    {
+                        int offset = points[i];
+                        int base_value = input[src2+offset] << 7;
+                        offset = dst + 3 * offset;
+                        output[offset++] = Clamp ((base_value + b) >> 7);
+                        output[offset++] = Clamp ((base_value + g) >> 7);
+                        output[offset++] = Clamp ((base_value + r) >> 7);
+                    }
+                    src2 += 2;
+                    dst += 6;
+                }
+                src2 += m_width;
+                dst += stride;
+            }
+            return output;
+        }
+
+        static byte Clamp (int val)
+        {
+            if (val > 255)      val = 255;
+            else if (val < 0)   val = 0;
+            return (byte)val;
+        }
+
+        byte[] PostProcess3 (byte[] input)
+        {
+            int bpp = LittleEndian.ToUInt16 (input, 2);
+            if (32 == bpp)
+                Format = PixelFormats.Bgra32;
+            else if (24 == bpp)
+                Format = PixelFormats.Bgr24;
+            else
+                throw new InvalidFormatException();
+            int pixel_size = bpp / 8;
+            int width  = LittleEndian.ToUInt16 (input, 4);
+            int height = LittleEndian.ToUInt16 (input, 6);
+            int stride = width * pixel_size;
+            var output = new byte[height * stride];
+            int ctl = 8;
+            int src = ctl + height;
+            int dst = 0;
+            for (int row = 0; row < height; ++row)
+            {
+                int c = input[ctl++];
+                if (0 != (c & 1))
+                {
+                    int prev = dst;
+                    Buffer.BlockCopy (input, src, output, dst, pixel_size);
+                    src += pixel_size;
+                    dst += pixel_size;
+                    int count = stride - pixel_size;
+                    while (count --> 0)
+                    {
+                        output[dst++] = (byte)(output[prev++] - input[src++]);
+                    }
+                }
+                else if (0 != (c & 2))
+                {
+                    int prev = dst - stride;
+                    int count = stride;
+                    while (count --> 0)
+                    {
+                        output[dst++] = (byte)(output[prev++] - input[src++]);
+                    }
+                }
+                else
+                {
+                    Buffer.BlockCopy (input, src, output, dst, pixel_size);
+                    dst += pixel_size;
+                    src += pixel_size;
+                    int prev = dst - stride;
+                    int count = stride - pixel_size;
+                    while (count --> 0)
+                    {
+                        output[dst] = (byte)((output[prev++] + output[dst-pixel_size]) / 2 - input[src++]);
+                        ++dst;
+                    }
+                }
+            }
+            return output;
+        }
+
         #region IDisposable Members
         bool _disposed = false;
         public void Dispose ()

supported.html

@@ -749,6 +749,7 @@ Houmon Hanbai ~Otona no Omocha Irimasen ka?~<br/>
 </td></tr>
 <tr class="odd"><td>*.pac</td><td>-<br/><tt>PAC</tt></td><td>No</td><td rowspan="2">Unison Shift</td><td rowspan="2">
 Maruhi Jinjibu Ryoujokuka<br/>
+Shikotama Slave ~Aruji de Shimai na Tenshi to Akuma~<br/>
 Unity Marriage ~Futari no Hanayome~<br/>
 </td></tr>
 <tr class="odd"><td>*.pgd</td><td><tt>GE</tt></td><td>No</td></tr>