mirror of
https://github.com/crskycode/GARbro.git
synced 2024-12-31 07:14:13 +08:00
343 lines
12 KiB
C#
343 lines
12 KiB
C#
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//! \file ImageHG3.cs
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//! \date Sat Jul 19 17:31:09 2014
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//! \brief Frontwing HG3 image format implementation.
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//
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using System;
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using System.IO;
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using System.ComponentModel.Composition;
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using System.Windows.Media.Imaging;
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using System.Windows.Media;
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using ZLibNet;
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using GameRes.Utility;
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namespace GameRes.Formats
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{
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[Export(typeof(ImageFormat))]
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public class Hg3Format : ImageFormat
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{
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public override string Tag { get { return "HG3"; } }
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public override string Description { get { return "Frontwing proprietary image format"; } }
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public override uint Signature { get { return 0x332d4748; } }
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public override ImageMetaData ReadMetaData (Stream stream)
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{
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var header = new byte[0x4c];
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if (0x4c != stream.Read (header, 0, header.Length))
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return null;
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if (LittleEndian.ToUInt32 (header, 0) != Signature)
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return null;
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if (LittleEndian.ToUInt32 (header, 4) != 0x0c)
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return null;
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if (!Binary.AsciiEqual (header, 0x14, "stdinfo\0"))
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return null;
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if (0x38 != LittleEndian.ToUInt32 (header, 0x1c))
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return null;
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if (0x20 != LittleEndian.ToUInt32 (header, 0x2c))
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return null;
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uint width = LittleEndian.ToUInt32 (header, 0x24); // @@L0
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uint height = LittleEndian.ToUInt32 (header, 0x28);
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int pos_x = LittleEndian.ToInt32 (header, 0x30);
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int pos_y = LittleEndian.ToInt32 (header, 0x34);
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pos_x -= LittleEndian.ToInt32 (header, 0x44);
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pos_y -= LittleEndian.ToInt32 (header, 0x48);
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return new ImageMetaData
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{
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Width = width,
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Height = height,
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OffsetX = pos_x,
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OffsetY = pos_y,
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BPP = 32,
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};
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}
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public override ImageData Read (Stream stream, ImageMetaData info)
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{
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stream.Position = 0x40;
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bool flipped = 0 == (stream.ReadByte() & 1) || info.OffsetY < 0;
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stream.Position = 0x4c;
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var header = new byte[0x28];
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if (0x28 != stream.Read (header, 0, header.Length))
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return null;
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if (!Binary.AsciiEqual (header, "img0000\0"))
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return null;
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uint data_size = LittleEndian.ToUInt32 (header, 0x0c);
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if (data_size < 0x18)
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return null;
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if (info.Height != LittleEndian.ToUInt32 (header, 0x14))
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return null;
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uint packed2_size = LittleEndian.ToUInt32 (header, 0x18);
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uint unpacked2_size = LittleEndian.ToUInt32 (header, 0x1c);
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uint packed1_size = LittleEndian.ToUInt32 (header, 0x20);
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uint unpacked1_size = LittleEndian.ToUInt32 (header, 0x24);
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if (packed2_size + packed1_size < packed2_size)
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return null;
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if (unpacked2_size + unpacked1_size < unpacked2_size)
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return null;
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long data_pos = stream.Position;
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using (var unpacked2 = ZLibCompressor.DeCompress (stream))
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{
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stream.Position = data_pos + packed2_size;
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using (var unpacked1 = ZLibCompressor.DeCompress (stream))
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{
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var decoder = new Decoder (unpacked1.GetBuffer(), unpacked1_size,
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unpacked2.GetBuffer(), unpacked2_size,
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info.Width, info.Height);
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decoder.Unpack();
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var pixels = decoder.Data;
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int stride = (int)info.Width * 4;
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var bitmap = BitmapSource.Create ((int)info.Width, (int)info.Height, 96, 96,
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PixelFormats.Bgra32, null, pixels, stride);
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if (flipped)
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{
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var flipped_bitmap = new TransformedBitmap();
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flipped_bitmap.BeginInit();
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flipped_bitmap.Source = bitmap;
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flipped_bitmap.Transform = new ScaleTransform { ScaleY = -1 };
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flipped_bitmap.EndInit();
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bitmap = flipped_bitmap;
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}
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bitmap.Freeze();
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return new ImageData (bitmap, info);
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}
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}
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}
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public override void Write (Stream file, ImageData image)
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{
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throw new NotImplementedException ("Hg3Format.Write not implemented");
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}
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class Decoder
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{
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byte[] m_in1;
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byte[] m_in2;
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byte[] m_image;
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uint m_in1_size;
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uint m_in2_size;
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uint m_dst_size;
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uint m_width;
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uint m_height;
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public byte[] Data { get { return m_image; } }
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public Decoder (byte[] in1, uint in1_size, byte[] in2, uint in2_size,
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uint width, uint height)
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{
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m_in1 = in1;
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m_in1_size = in1_size;
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m_in2 = in2;
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m_in2_size = in2_size;
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m_width = width;
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m_height = height;
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m_dst_size = width*height*4;
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m_image = new byte[(int)m_dst_size];
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}
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uint esi;
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uint edi;
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uint eax;
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uint ebx;
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uint ecx;
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uint edx;
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uint L0, L1, L2, L3, L4;
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uint m_plane;
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public void Unpack ()
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{
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m_plane = 0;
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edi = 0;
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esi = 0;
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ebx = 0;
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eax = m_in1_size;
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L0 = m_in2_size;
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L1 = 0;
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bool skip_first = GetNextBit();
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Proc4();
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ecx = m_dst_size;
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if (eax > m_dst_size)
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throw new InvalidFormatException ("Underflow at Hg3Format.Decoder.Unpack()");
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m_dst_size -= eax;
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ecx >>= 2;
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L2 = eax;
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L3 = ecx;
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L4 = ecx;
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for (;;)
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{
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if (!skip_first)
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{
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// @@1:
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if (0 == L2)
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break;
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Proc4();
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ecx = eax;
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if (ecx > L2)
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throw new InvalidFormatException ("Overflow at Hg3Format.Decoder.Unpack()");
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L2 -= ecx;
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eax = 0;
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do
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Proc2();
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while (0 != --ecx);
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}
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// @@1a:
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if (0 == L2)
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break;
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Proc4();
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ecx = eax;
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if (ecx > L2 || ecx > L0)
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throw new InvalidFormatException ("Overflow (2) at Hg3Format.Decoder.Unpack()");
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L2 -= ecx;
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L0 -= ecx;
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do
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{
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eax = m_in2[L1++];
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Proc2();
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}
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while (0 != --ecx);
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skip_first = false;
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}
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// @@7:
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ecx = m_dst_size;
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esi = 0;
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if (0 != ecx)
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{
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eax = 0;
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do
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Proc2();
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while (0 != --ecx);
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}
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Proc6 (m_width, m_height);
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// @@9:
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eax = 0;
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edx = m_in1_size;
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}
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void Proc2 () // @@2
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{
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m_image[edi] = (byte)eax;
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edi += 4;
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if (0 == --L3)
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{
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edi = ++m_plane;
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L3 = L4;
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}
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}
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bool GetNextBit () // @@3
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{
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bool carry = 0 != (ebx & 1);
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ebx >>= 1;
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if (0 == ebx)
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{
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if (0 == m_in1_size--)
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throw new InvalidFormatException ("Hg3Format.Decoder.Underflow at GetNextBit()");
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ebx = (uint)(m_in1[esi++] | 0x100);
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carry = 0 != (ebx & 1);
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ebx >>= 1;
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}
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return carry;
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}
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void Proc4 () // @@4
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{
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ecx = 0;
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eax = 0;
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do
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{
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if (ecx >= 0x20)
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throw new InvalidFormatException ("Hg3Format.Decoder.Overflow at Proc4");
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++ecx;
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}
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while (!GetNextBit());
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++eax;
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while (0 != --ecx)
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{
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eax += eax + (uint)(GetNextBit() ? 1 : 0);
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}
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}
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void Proc6 (uint width, uint height)
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{
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uint[] table = new uint[0x100];
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ecx = 0;
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for (uint i = 0; i < 0x100; ++i)
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{
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eax = 0xffffffff;
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edx = i;
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do
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{
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eax >>= 2;
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eax |= (edx & 3) << 30;
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eax >>= 6;
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edx >>= 2;
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}
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while (0 != (0x80 & eax));
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table[i] = eax;
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}
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ecx = width * height * 4;
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for (uint i = 0; i < ecx; i += 4)
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{
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eax = m_image[i];
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edx = table[eax];
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edx <<= 2;
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eax = m_image[i+1];
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edx += table[eax];
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edx <<= 2;
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eax = m_image[i+2];
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edx += table[eax];
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edx <<= 2;
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eax = m_image[i+3];
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edx += table[eax];
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m_image[i] = (byte)(edx);
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m_image[i+1] = (byte)(edx >> 8);
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m_image[i+2] = (byte)(edx >> 16);
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m_image[i+3] = (byte)(edx >> 24);
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}
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edi = 0;
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for (int i = 0; i < 4; ++i)
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{
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eax = m_image[edi];
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edx = (uint)(0 == (eax & 1) ? 0 : 0xff);
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eax >>= 1;
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eax ^= edx;
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m_image[edi++] = (byte)eax;
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}
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ecx = width;
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if (0 != --ecx)
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{
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ecx <<= 2;
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do
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{
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eax = m_image[edi];
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edx = (uint)(0 == (eax & 1) ? 0 : 0xff);
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eax >>= 1;
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eax ^= edx;
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eax += m_image[edi-4];
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m_image[edi++] = (byte)eax;
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}
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while (0 != --ecx);
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}
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ecx = height;
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if (0 != --ecx)
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{
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uint stride = width*4;
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ecx *= stride;
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do
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{
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eax = m_image[edi];
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edx = (uint)(0 == (eax & 1) ? 0 : 0xff);
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eax >>= 1;
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eax ^= edx;
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eax += m_image[edi-stride];
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m_image[edi++] = (byte)eax;
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}
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while (0 != --ecx);
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}
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}
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}
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}
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}
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