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221 lines
8.3 KiB
C#
221 lines
8.3 KiB
C#
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//! \file ImageGRP.cs
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//! \date Wed Jun 24 22:14:41 2015
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//! \brief Cherry Soft compressed image format.
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//
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// Copyright (C) 2015 by morkt
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//
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// Permission is hereby granted, free of charge, to any person obtaining a copy
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// of this software and associated documentation files (the "Software"), to
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// deal in the Software without restriction, including without limitation the
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// rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
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// sell copies of the Software, and to permit persons to whom the Software is
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// furnished to do so, subject to the following conditions:
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//
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// The above copyright notice and this permission notice shall be included in
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// all copies or substantial portions of the Software.
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//
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// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
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// FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
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// IN THE SOFTWARE.
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//
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using System;
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using System.ComponentModel.Composition;
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using System.IO;
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using System.Windows.Media;
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using System.Windows.Media.Imaging;
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using GameRes.Utility;
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namespace GameRes.Formats.Cherry
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{
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internal class GrpMetaData : ImageMetaData
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{
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public int PackedSize;
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public int UnpackedSize;
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public int Offset;
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}
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[Export(typeof(ImageFormat))]
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public class GrpFormat : ImageFormat
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{
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public override string Tag { get { return "GRP/CHERRY"; } }
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public override string Description { get { return "Cherry Soft comprressed image format"; } }
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public override uint Signature { get { return 0; } }
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public GrpFormat ()
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{
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Extensions = new string[] { "grp" };
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}
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public override ImageMetaData ReadMetaData (Stream stream)
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{
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var header = new byte[0x18];
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if (header.Length != stream.Read (header, 0, header.Length))
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return null;
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uint width = LittleEndian.ToUInt32 (header, 0);
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uint height = LittleEndian.ToUInt32 (header, 4);
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int bpp = LittleEndian.ToInt32 (header, 8);
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int packed_size = LittleEndian.ToInt32 (header, 0x0C);
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int unpacked_size = LittleEndian.ToInt32 (header, 0x10);
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if (0 == width || 0 == height || width > 0x7fff || height > 0x7fff
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|| (bpp != 24 && bpp != 8)
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|| unpacked_size <= 0 || packed_size < 0)
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return null;
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return new GrpMetaData
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{
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Width = width,
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Height = height,
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BPP = bpp,
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PackedSize = packed_size,
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UnpackedSize = unpacked_size,
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Offset = LittleEndian.ToInt32 (header, 0x14),
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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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var meta = info as GrpMetaData;
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if (null == meta)
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throw new ArgumentException ("GrpFormat.Read should be supplied with GrpMetaData", "info");
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var reader = new GrpReader (stream, meta);
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return reader.CreateImage();
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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 ("GrpFormat.Write not implemented");
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}
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}
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internal class GrpReader
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{
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GrpMetaData m_info;
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Stream m_input;
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byte[] m_image_data;
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int m_stride;
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public PixelFormat Format { get; private set; }
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public BitmapPalette Palette { get; private set; }
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public byte[] Pixels { get { return m_image_data; } }
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public GrpReader (Stream input, GrpMetaData info)
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{
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m_info = info;
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m_input = input;
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if (8 == info.BPP)
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Format = PixelFormats.Indexed8;
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else if (24 == info.BPP)
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Format = PixelFormats.Bgr24;
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else
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throw new NotSupportedException ("Not supported GRP image depth");
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m_stride = (int)m_info.Width*((Format.BitsPerPixel+7)/8);
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}
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public ImageData CreateImage ()
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{
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m_input.Position = 0x18;
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int data_size = m_info.UnpackedSize;
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if (m_info.PackedSize != 0)
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data_size = m_info.PackedSize;
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if (0x0f0f0f0f == m_info.Offset && 0x18 + data_size == m_input.Length)
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return ReadV2();
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else if (8 == m_info.BPP && 0x418 == m_info.Offset ||
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24 == m_info.BPP && 0x018 == m_info.Offset)
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return ReadV1();
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else
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throw new InvalidFormatException();
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}
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private ImageData ReadV1 ()
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{
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if (8 == m_info.BPP)
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{
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var palette_data = new byte[0x400];
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if (palette_data.Length != m_input.Read (palette_data, 0, palette_data.Length))
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throw new InvalidFormatException ("Unexpected end of file");
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SetPalette (palette_data);
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}
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var packed = new byte[m_info.PackedSize];
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if (packed.Length != m_input.Read (packed, 0, packed.Length))
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throw new InvalidFormatException ("Unexpected end of file");
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for (int i = 0; i < packed.Length; ++i)
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packed[i] ^= (byte)i;
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using (var input = new MemoryStream (packed))
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using (var reader = new LzssReader (input, packed.Length, m_info.UnpackedSize))
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{
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reader.Unpack();
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m_image_data = new byte[m_info.UnpackedSize];
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// flip pixels vertically
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int dst = 0;
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for (int src = m_stride * ((int)m_info.Height-1); src >= 0; src -= m_stride)
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{
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Buffer.BlockCopy (reader.Data, src, m_image_data, dst, m_stride);
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dst += m_stride;
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}
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}
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return ImageData.Create (m_info, Format, Palette, m_image_data);
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}
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private ImageData ReadV2 ()
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{
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if (0 != m_info.PackedSize)
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{
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using (var reader = new LzssReader (m_input, m_info.PackedSize, m_info.UnpackedSize))
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{
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reader.Unpack();
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m_image_data = reader.Data;
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}
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}
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else
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{
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m_image_data = new byte[m_info.UnpackedSize];
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if (m_image_data.Length != m_input.Read (m_image_data, 0, m_image_data.Length))
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throw new InvalidFormatException ("Unexpected end of file");
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}
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int pixels_offset = 0;
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if (8 == m_info.BPP)
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{
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SetPalette (m_image_data);
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pixels_offset += 0x400;
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}
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if (0 == pixels_offset)
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return ImageData.Create (m_info, Format, Palette, m_image_data);
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if (pixels_offset + m_stride*(int)m_info.Height > m_image_data.Length)
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throw new InvalidFormatException();
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unsafe
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{
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fixed (byte* pixels = &m_image_data[pixels_offset])
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{
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var bitmap = BitmapSource.Create ((int)m_info.Width, (int)m_info.Height,
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ImageData.DefaultDpiX, ImageData.DefaultDpiY, Format, Palette,
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(IntPtr)pixels, m_image_data.Length-pixels_offset, m_stride);
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bitmap.Freeze();
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return new ImageData (bitmap, m_info);
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}
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}
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}
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private void SetPalette (byte[] palette_data)
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{
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if (palette_data.Length < 0x400)
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throw new InvalidFormatException();
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var palette = new Color[0x100];
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for (int i = 0; i < palette.Length; ++i)
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{
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int c = i * 4;
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palette[i] = Color.FromRgb (palette_data[c+2], palette_data[c+1], palette_data[c]);
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}
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Palette = new BitmapPalette (palette);
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}
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}
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}
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