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318 lines
11 KiB
C#
318 lines
11 KiB
C#
//! \file ImageGP.cs
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//! \date Thu Nov 12 14:00:52 2015
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//! \brief old Eushully 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 GameRes.Utility;
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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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namespace GameRes.Formats.Eushully
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{
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internal class GpMetaData : ImageMetaData
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{
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public bool HasAlpha;
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public int Method;
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public int ElementSize;
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public int PixelsPerElement;
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public int PaletteSize;
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}
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[Export(typeof(ImageFormat))]
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public class GpFormat : ImageFormat
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{
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public override string Tag { get { return "GP/EUSHULLY"; } }
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public override string Description { get { return "Old Eushully graphic format"; } }
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public override uint Signature { get { return 0; } }
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public GpFormat ()
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{
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Extensions = new string[] { "gpcf" }; // made-up, real files have no extension
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}
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public override ImageMetaData ReadMetaData (Stream stream)
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{
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int alpha_channel = stream.ReadByte();
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int method = stream.ReadByte();
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int align1 = stream.ReadByte();
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int align2 = stream.ReadByte();
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int bpp = stream.ReadByte();
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if (alpha_channel < 0 || alpha_channel > 1 || method < 0 || method > 2
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|| align1 < 0 || align1 > 4 || align2 < 0 || align2 > 4
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|| bpp < 0 || !(bpp <= 16 || 24 == bpp || 32 == bpp))
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return null;
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using (var reader = new ArcView.Reader (stream))
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{
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int palette_size = reader.ReadInt32();
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uint width = reader.ReadUInt16();
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uint height = reader.ReadUInt16();
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if (0 == palette_size || 0 == width || 0 == height || palette_size >= stream.Length)
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return null;
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return new GpMetaData
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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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HasAlpha = alpha_channel != 0,
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Method = method,
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ElementSize = align1,
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PixelsPerElement = align2,
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PaletteSize = palette_size,
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};
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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 = (GpMetaData)info;
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using (var reader = new GpReader (stream, meta))
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{
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reader.Unpack();
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return ImageData.Create (info, reader.Format, reader.Palette, reader.Data, reader.Stride);
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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 System.NotImplementedException ("GpFormat.Write not implemented");
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}
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}
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internal sealed class GpReader : IDisposable
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{
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BinaryReader m_input;
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GpMetaData m_info;
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int m_width;
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int m_height;
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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[] Data { get; private set; }
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public int Stride { get; private set; }
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public GpReader (Stream input, GpMetaData info)
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{
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m_info = info;
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m_width = (int)m_info.Width;
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m_height = (int)m_info.Height;
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m_input = new ArcView.Reader (input);
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}
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public void Unpack ()
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{
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m_input.BaseStream.Position = 0xD;
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switch (m_info.Method)
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{
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case 0: UnpackV0(); break;
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case 1: UnpackV1(); break;
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case 2: UnpackV2(); break;
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default: throw new NotSupportedException ("Not supported GPC image format");
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}
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if (m_info.HasAlpha)
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{
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if (ReadAlpha())
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Format = PixelFormats.Bgra32;
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}
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}
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void UnpackV0 ()
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{
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var image = m_input.ReadBytes (m_height * m_width * 3);
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Stride = m_width * 4;
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var pixels = new byte[Stride * m_height];
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int src = 0;
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int dst = 0;
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while (src < image.Length)
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{
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pixels[dst++] = image[src+2];
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pixels[dst++] = image[src+1];
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pixels[dst++] = image[src];
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src += 3;
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dst++;
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}
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Data = pixels;
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Format = PixelFormats.Bgr32;
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}
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void UnpackV1 ()
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{
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var palette = m_input.ReadBytes (3 * m_info.PaletteSize);
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if (8 == m_info.BPP && !m_info.HasAlpha)
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{
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SetPalette (palette, m_info.PaletteSize);
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Data = m_input.ReadBytes (m_width*m_height);
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Format = PixelFormats.Indexed8;
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Stride = m_width;
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}
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else
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{
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Data = ReadIndexedImage (palette);
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Format = PixelFormats.Bgr32;
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Stride = m_width * 4;
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}
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}
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byte[] ReadIndexedImage (byte[] palette)
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{
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int rgb_mask = (1 << m_info.BPP) - 1;
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var chunk = new byte[4];
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var pixels = new byte[m_width*m_height*4];
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int dst = 0;
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for (int y = 0; y < m_height; ++y)
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{
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int x = 0;
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while (x < m_width)
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{
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m_input.Read (chunk, 0, m_info.ElementSize);
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int color = LittleEndian.ToInt32 (chunk, 0);
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for (int i = 0; i < m_info.PixelsPerElement & x < m_width; ++i)
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{
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int index = 3 * (color & rgb_mask);
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if (index >= palette.Length)
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throw new InvalidFormatException();
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color >>= m_info.BPP;
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pixels[dst++] = palette[index+2];
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pixels[dst++] = palette[index+1];
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pixels[dst++] = palette[index];
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++dst;
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++x;
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}
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}
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}
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return pixels;
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}
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void SetPalette (byte[] palette_data, int colors)
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{
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var palette = new Color[colors];
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for (int i = 0; i < palette.Length; ++i)
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{
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int c = i * 3;
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palette[i] = Color.FromRgb (palette_data[c], palette_data[c+1], palette_data[c+2]);
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}
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Palette = new BitmapPalette (palette);
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}
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void UnpackV2 ()
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{
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Stride = m_width * 4;
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var palette = m_input.ReadBytes (3 * m_info.PaletteSize);
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int back1 = m_input.ReadInt32() * 3; // index within palette
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int back2 = m_input.ReadInt32();
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if (back2 < 0)
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back2 += m_info.PaletteSize;
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back2 *= 3;
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m_input.ReadInt32(); // data_size
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int rgb_mask = (1 << m_info.BPP) - 1;
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var pixels = new byte[Stride*m_height];
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int dst = 0;
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var chunk = new byte[4];
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for (int y = 0; y < m_height; ++y)
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{
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int x = 0;
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while (x < m_width)
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{
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ushort background_length = m_input.ReadUInt16();
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ushort foreground_length = m_input.ReadUInt16();
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int color; // index within palette
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if ((background_length & 0x8000) == 0)
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{
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color = back1;
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}
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else
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{
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color = back2;
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background_length &= 0x7FFF;
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}
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int i;
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for (i = 0; i < background_length; ++i)
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{
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pixels[dst++] = palette[color+2];
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pixels[dst++] = palette[color+1];
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pixels[dst++] = palette[color];
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++dst;
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++x;
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}
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i = 0;
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while (i < foreground_length && x < m_width)
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{
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m_input.Read (chunk, 0, m_info.ElementSize);
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int element = LittleEndian.ToInt32 (chunk, 0);
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for (int j = 0; j != m_info.PixelsPerElement && x < m_width && i < foreground_length; ++j)
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{
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color = 3 * (element & rgb_mask);
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element >>= m_info.BPP;
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pixels[dst++] = palette[color+2];
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pixels[dst++] = palette[color+1];
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pixels[dst++] = palette[color];
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++dst;
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++x;
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++i;
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}
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}
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}
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}
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Data = pixels;
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Format = PixelFormats.Bgr32;
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}
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bool ReadAlpha ()
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{
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var w = m_input.ReadInt32();
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var h = m_input.ReadInt32();
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if (w != m_width || h != m_height)
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return false;
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int i = 3;
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while (i < Data.Length)
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{
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byte alpha = m_input.ReadByte();
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int count = m_input.ReadByte();
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for (int j = 0; j < count && i < Data.Length; ++j)
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{
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Data[i] = alpha;
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i += 4;
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}
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}
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return true;
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}
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#region IDisposable Members
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bool _disposed = false;
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public void Dispose ()
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{
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if (!_disposed)
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{
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m_input.Dispose();
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_disposed = true;
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}
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}
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#endregion
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}
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}
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