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2017-01-17 07:03:51 +04:00
//! \file ImageCHR.cs
//! \date Mon Jan 16 07:53:42 2017
//! \brief 'Game System' character image format.
//
// Copyright (C) 2017 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 System.ComponentModel.Composition;
using System.IO;
using System.Windows.Media;
using GameRes.Utility;
namespace GameRes.Formats.GameSystem
{
internal class ChrMetaData : ImageMetaData
{
public int RgbSize;
}
[Export(typeof(ImageFormat))]
public class ChrFormat : ImageFormat
{
public override string Tag { get { return "CHR"; } }
public override string Description { get { return "'Game System' character image format"; } }
public override uint Signature { get { return 0; } }
public override ImageMetaData ReadMetaData (IBinaryStream file)
{
if (file.Signature != file.Length)
return null;
var header = file.ReadHeader (0x18);
int rgb_size = header.ToInt32 (4);
if (rgb_size <= 0x20 || rgb_size > file.Length)
return null;
uint width = header.ToUInt32 (8);
uint height = header.ToUInt32 (0xC);
int x = header.ToInt32 (0x10);
int y = header.ToInt32 (0x14);
if (0 == width || width > 0x8000 || 0 == height || height > 0x8000
|| x < 0 || x + width > 0x8000 || y < 0 || y + height > 0x8000)
return null;
return new ChrMetaData
{
Width = width,
Height = height,
OffsetX = x,
OffsetY = y,
BPP = 32,
RgbSize = rgb_size,
};
}
public override ImageData Read (IBinaryStream file, ImageMetaData info)
{
var reader = new ChrReader (file, (ChrMetaData)info);
var pixels = reader.Unpack();
return ImageData.CreateFlipped (info, PixelFormats.Bgra32, null, pixels, reader.Stride);
}
public override void Write (Stream file, ImageData image)
{
throw new System.NotImplementedException ("ChrFormat.Write not implemented");
}
}
internal sealed class ChrReader
{
IBinaryStream m_input;
ChrMetaData m_info;
byte[] m_output;
int m_stride;
public byte[] Data { get { return m_output; } }
public int Stride { get { return m_stride; } }
public ChrReader (IBinaryStream input, ChrMetaData info)
{
m_input = input;
m_info = info;
m_stride = (int)m_info.Width * 4;
m_output = new byte[m_stride * (int)m_info.Height];
}
public byte[] Unpack ()
{
UnpackBaseline();
if (m_info.RgbSize < m_input.Length)
{
m_input.Position = m_info.RgbSize;
int overlay_length = m_input.ReadInt32();
if (overlay_length > 0)
ReadOverlay();
}
return m_output;
}
public byte[] UnpackBaseline ()
{
m_input.Position = 0x20;
UnpackRgb ((int)m_info.Height);
return m_output;
}
void UnpackRgb (int row_count)
{
int row = 0;
while (row_count --> 0)
{
int dst = row;
int x = 0;
for (;;)
{
int ctl = m_input.ReadUInt8();
if (ctl < 0x7F)
{
int alpha = -(2 * ctl - 0xFE);
m_input.Read (m_output, dst, 3);
m_output[dst+3] = (byte)~alpha;
dst += 4;
++x;
}
else if (ctl < 0x9F)
{
int count = ctl - 0x7E;
x += count;
m_input.Read (m_output, dst, 3);
m_output[dst+3] = 0xFF;
count *= 4;
Binary.CopyOverlapped (m_output, dst, dst+4, count-4);
dst += count;
}
else if (0xFF == ctl)
break;
else
{
int count = ctl - 0x9E;
dst += count * 4;
x += count;
}
}
row += m_stride;
}
}
void ReadOverlay ()
{
m_input.ReadInt32();
int frame_count = m_input.ReadInt32();
if (frame_count <= 0)
return;
int x = m_input.ReadInt16() - m_info.OffsetX;
int y = m_input.ReadInt16();
int w = m_input.ReadInt16();
int h = m_input.ReadInt16();
y = (int)m_info.Height + m_info.OffsetY - y - h;
if (x < 0 || y < 0)
return;
int output = y * m_stride + x * 4;
for (int i = 0; i < h; ++i)
{
int dst = output;
for (int j = 0; j < w; ++j)
{
m_input.Read (m_output, dst, 3);
int a = m_input.ReadByte();
if (a != 0x80)
throw new InvalidFormatException ("Error reading overlay frame");
m_output[dst+3] = 0xFF;
dst += 4;
}
output += m_stride;
}
}
}
}