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implemented 'Game System' CHR images.
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morkt
193
ArcFormats/GameSystem/ImageCHR.cs
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193
ArcFormats/GameSystem/ImageCHR.cs
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//! \file ImageCHR.cs
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//! \date Mon Jan 16 07:53:42 2017
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//! \brief 'Game System' character image format.
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//
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// Copyright (C) 2017 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.ComponentModel.Composition;
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using System.IO;
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using System.Windows.Media;
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using GameRes.Utility;
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namespace GameRes.Formats.GameSystem
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{
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internal class ChrMetaData : ImageMetaData
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{
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public int RgbSize;
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}
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[Export(typeof(ImageFormat))]
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public class ChrFormat : ImageFormat
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{
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public override string Tag { get { return "CHR"; } }
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public override string Description { get { return "'Game System' character image format"; } }
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public override uint Signature { get { return 0; } }
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public override ImageMetaData ReadMetaData (IBinaryStream file)
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{
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if (file.Signature != file.Length)
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return null;
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var header = file.ReadHeader (0x18);
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int rgb_size = header.ToInt32 (4);
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if (rgb_size <= 0x20 || rgb_size > file.Length)
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return null;
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uint width = header.ToUInt32 (8);
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uint height = header.ToUInt32 (0xC);
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int x = header.ToInt32 (0x10);
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int y = header.ToInt32 (0x14);
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if (0 == width || width > 0x8000 || 0 == height || height > 0x8000
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|| x < 0 || x + width > 0x8000 || y < 0 || y + height > 0x8000)
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return null;
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return new ChrMetaData
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{
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Width = width,
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Height = height,
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OffsetX = x,
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OffsetY = y,
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BPP = 32,
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RgbSize = rgb_size,
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};
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}
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public override ImageData Read (IBinaryStream file, ImageMetaData info)
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{
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var reader = new ChrReader (file, (ChrMetaData)info);
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var pixels = reader.Unpack();
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return ImageData.CreateFlipped (info, PixelFormats.Bgra32, null, pixels, reader.Stride);
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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 System.NotImplementedException ("ChrFormat.Write not implemented");
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}
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}
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internal sealed class ChrReader
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{
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IBinaryStream m_input;
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ChrMetaData m_info;
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byte[] m_output;
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int m_stride;
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public byte[] Data { get { return m_output; } }
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public int Stride { get { return m_stride; } }
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public ChrReader (IBinaryStream input, ChrMetaData info)
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{
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m_input = input;
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m_info = info;
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m_stride = (int)m_info.Width * 4;
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m_output = new byte[m_stride * (int)m_info.Height];
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}
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public byte[] Unpack ()
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{
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UnpackBaseline();
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if (m_info.RgbSize < m_input.Length)
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{
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m_input.Position = m_info.RgbSize;
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int overlay_length = m_input.ReadInt32();
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if (overlay_length > 0)
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ReadOverlay();
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}
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return m_output;
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}
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public byte[] UnpackBaseline ()
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{
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m_input.Position = 0x20;
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UnpackRgb ((int)m_info.Height);
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return m_output;
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}
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void UnpackRgb (int row_count)
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{
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int row = 0;
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while (row_count --> 0)
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{
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int dst = row;
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int x = 0;
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for (;;)
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{
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int ctl = m_input.ReadUInt8();
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if (ctl < 0x7F)
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{
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int alpha = -(2 * ctl - 0xFE);
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m_input.Read (m_output, dst, 3);
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m_output[dst+3] = (byte)~alpha;
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dst += 4;
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++x;
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}
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else if (ctl < 0x9F)
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{
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int count = ctl - 0x7E;
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x += count;
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m_input.Read (m_output, dst, 3);
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m_output[dst+3] = 0xFF;
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count *= 4;
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Binary.CopyOverlapped (m_output, dst, dst+4, count-4);
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dst += count;
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}
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else if (0xFF == ctl)
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break;
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else
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{
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int count = ctl - 0x9E;
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dst += count * 4;
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x += count;
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}
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}
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row += m_stride;
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}
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}
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void ReadOverlay ()
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{
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m_input.ReadInt32();
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int frame_count = m_input.ReadInt32();
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if (frame_count <= 0)
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return;
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int x = m_input.ReadInt16() - m_info.OffsetX;
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int y = m_input.ReadInt16();
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int w = m_input.ReadInt16();
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int h = m_input.ReadInt16();
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y = (int)m_info.Height + m_info.OffsetY - y - h;
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if (x < 0 || y < 0)
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return;
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int output = y * m_stride + x * 4;
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for (int i = 0; i < h; ++i)
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{
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int dst = output;
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for (int j = 0; j < w; ++j)
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{
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m_input.Read (m_output, dst, 3);
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int a = m_input.ReadByte();
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if (a != 0x80)
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throw new InvalidFormatException ("Error reading overlay frame");
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m_output[dst+3] = 0xFF;
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dst += 4;
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}
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output += m_stride;
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}
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}
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}
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}
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