GARbro-mirror/ArcFormats/Eushully/ImageGP.cs

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2015-11-13 15:44:12 +08:00
//! \file ImageGP.cs
//! \date Thu Nov 12 14:00:52 2015
//! \brief old Eushully image format.
//
// Copyright (C) 2015 by morkt
//
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to
// deal in the Software without restriction, including without limitation the
// rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
// sell copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in
// all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
// FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
// IN THE SOFTWARE.
//
using GameRes.Utility;
using System;
using System.ComponentModel.Composition;
using System.IO;
using System.Windows.Media;
using System.Windows.Media.Imaging;
namespace GameRes.Formats.Eushully
{
internal class GpMetaData : ImageMetaData
{
public bool HasAlpha;
public int Method;
public int ElementSize;
public int PixelsPerElement;
public int PaletteSize;
}
[Export(typeof(ImageFormat))]
public class GpFormat : ImageFormat
{
public override string Tag { get { return "GP/EUSHULLY"; } }
public override string Description { get { return "Old Eushully graphic format"; } }
public override uint Signature { get { return 0; } }
public GpFormat ()
{
Extensions = new string[] { "gpcf" }; // made-up, real files have no extension
}
public override ImageMetaData ReadMetaData (Stream stream)
{
int alpha_channel = stream.ReadByte();
int method = stream.ReadByte();
int align1 = stream.ReadByte();
int align2 = stream.ReadByte();
int bpp = stream.ReadByte();
if (alpha_channel < 0 || alpha_channel > 1 || method < 0 || method > 2
|| align1 < 0 || align1 > 4 || align2 < 0 || align2 > 4
|| bpp <= 0 || !(bpp <= 16 || 24 == bpp || 32 == bpp))
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return null;
using (var reader = new ArcView.Reader (stream))
{
int palette_size = reader.ReadInt32();
uint width = reader.ReadUInt16();
uint height = reader.ReadUInt16();
if (0 == palette_size || 0 == width || 0 == height || palette_size >= stream.Length)
return null;
return new GpMetaData
{
Width = width,
Height = height,
BPP = bpp,
HasAlpha = alpha_channel != 0,
Method = method,
ElementSize = align1,
PixelsPerElement = align2,
PaletteSize = palette_size,
};
}
}
public override ImageData Read (Stream stream, ImageMetaData info)
{
var meta = (GpMetaData)info;
using (var reader = new GpReader (stream, meta))
{
reader.Unpack();
return ImageData.Create (info, reader.Format, reader.Palette, reader.Data, reader.Stride);
}
}
public override void Write (Stream file, ImageData image)
{
throw new System.NotImplementedException ("GpFormat.Write not implemented");
}
}
internal sealed class GpReader : IDisposable
{
BinaryReader m_input;
GpMetaData m_info;
int m_width;
int m_height;
public PixelFormat Format { get; private set; }
public BitmapPalette Palette { get; private set; }
public byte[] Data { get; private set; }
public int Stride { get; private set; }
public GpReader (Stream input, GpMetaData info)
{
m_info = info;
m_width = (int)m_info.Width;
m_height = (int)m_info.Height;
m_input = new ArcView.Reader (input);
}
public void Unpack ()
{
m_input.BaseStream.Position = 0xD;
switch (m_info.Method)
{
case 0: UnpackV0(); break;
case 1: UnpackV1(); break;
case 2: UnpackV2(); break;
default: throw new NotSupportedException ("Not supported GPC image format");
}
if (m_info.HasAlpha)
{
if (ReadAlpha())
Format = PixelFormats.Bgra32;
}
}
void UnpackV0 ()
{
var image = m_input.ReadBytes (m_height * m_width * 3);
Stride = m_width * 4;
var pixels = new byte[Stride * m_height];
int src = 0;
int dst = 0;
while (src < image.Length)
{
pixels[dst++] = image[src+2];
pixels[dst++] = image[src+1];
pixels[dst++] = image[src];
src += 3;
dst++;
}
Data = pixels;
Format = PixelFormats.Bgr32;
}
void UnpackV1 ()
{
var palette = m_input.ReadBytes (3 * m_info.PaletteSize);
if (8 == m_info.BPP && !m_info.HasAlpha)
{
SetPalette (palette, m_info.PaletteSize);
Data = m_input.ReadBytes (m_width*m_height);
Format = PixelFormats.Indexed8;
Stride = m_width;
}
else
{
Data = ReadIndexedImage (palette);
Format = PixelFormats.Bgr32;
Stride = m_width * 4;
}
}
byte[] ReadIndexedImage (byte[] palette)
{
int rgb_mask = (1 << m_info.BPP) - 1;
var chunk = new byte[4];
var pixels = new byte[m_width*m_height*4];
int dst = 0;
for (int y = 0; y < m_height; ++y)
{
int x = 0;
while (x < m_width)
{
m_input.Read (chunk, 0, m_info.ElementSize);
int color = LittleEndian.ToInt32 (chunk, 0);
for (int i = 0; i < m_info.PixelsPerElement & x < m_width; ++i)
{
int index = 3 * (color & rgb_mask);
if (index >= palette.Length)
throw new InvalidFormatException();
color >>= m_info.BPP;
pixels[dst++] = palette[index+2];
pixels[dst++] = palette[index+1];
pixels[dst++] = palette[index];
++dst;
++x;
}
}
}
return pixels;
}
void SetPalette (byte[] palette_data, int colors)
{
var palette = new Color[colors];
for (int i = 0; i < palette.Length; ++i)
{
int c = i * 3;
palette[i] = Color.FromRgb (palette_data[c], palette_data[c+1], palette_data[c+2]);
}
Palette = new BitmapPalette (palette);
}
void UnpackV2 ()
{
Stride = m_width * 4;
var palette = m_input.ReadBytes (3 * m_info.PaletteSize);
int back1 = m_input.ReadInt32() * 3; // index within palette
int back2 = m_input.ReadInt32();
if (back2 < 0)
back2 += m_info.PaletteSize;
back2 *= 3;
m_input.ReadInt32(); // data_size
int rgb_mask = (1 << m_info.BPP) - 1;
var pixels = new byte[Stride*m_height];
int dst = 0;
var chunk = new byte[4];
for (int y = 0; y < m_height; ++y)
{
int x = 0;
while (x < m_width)
{
ushort background_length = m_input.ReadUInt16();
ushort foreground_length = m_input.ReadUInt16();
int color; // index within palette
if ((background_length & 0x8000) == 0)
{
color = back1;
}
else
{
color = back2;
background_length &= 0x7FFF;
}
int i;
for (i = 0; i < background_length; ++i)
{
pixels[dst++] = palette[color+2];
pixels[dst++] = palette[color+1];
pixels[dst++] = palette[color];
++dst;
++x;
}
i = 0;
while (i < foreground_length && x < m_width)
{
m_input.Read (chunk, 0, m_info.ElementSize);
int element = LittleEndian.ToInt32 (chunk, 0);
for (int j = 0; j != m_info.PixelsPerElement && x < m_width && i < foreground_length; ++j)
{
color = 3 * (element & rgb_mask);
element >>= m_info.BPP;
pixels[dst++] = palette[color+2];
pixels[dst++] = palette[color+1];
pixels[dst++] = palette[color];
++dst;
++x;
++i;
}
}
}
}
Data = pixels;
Format = PixelFormats.Bgr32;
}
bool ReadAlpha ()
{
var w = m_input.ReadInt32();
var h = m_input.ReadInt32();
if (w != m_width || h != m_height)
return false;
int i = 3;
while (i < Data.Length)
{
byte alpha = m_input.ReadByte();
int count = m_input.ReadByte();
for (int j = 0; j < count && i < Data.Length; ++j)
{
Data[i] = alpha;
i += 4;
}
}
return true;
}
#region IDisposable Members
bool _disposed = false;
public void Dispose ()
{
if (!_disposed)
{
m_input.Dispose();
_disposed = true;
}
}
#endregion
}
}