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//! \file ImageUG.cs
//! \date 2023 Oct 16
//! \brief Ucom image format (PC-98).
//
// Copyright (C) 2023 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.
//
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using System;
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using System.ComponentModel.Composition;
using System.IO;
using System.Windows.Media;
using System.Windows.Media.Imaging;
// [961220][Ucom] Bunkasai
namespace GameRes.Formats.Ucom
{
[Export(typeof(ImageFormat))]
public class UgFormat : ImageFormat
{
public override string Tag => "UG";
public override string Description => "Ucom image format";
public override uint Signature => 0;
public override ImageMetaData ReadMetaData (IBinaryStream file)
{
if (!file.Name.HasExtension (".UG"))
return null;
int left = file.ReadUInt16();
int top = file.ReadUInt16();
int right = file.ReadUInt16();
int bottom = file.ReadUInt16();
int width = (right - left + 1) << 3;
int height = bottom - top + 1;
if (width <= 0 || height <= 0 || width > 640 || height > 512)
return null;
return new ImageMetaData
{
Width = (uint)width,
Height = (uint)height,
OffsetX = left,
OffsetY = top,
BPP = 4,
};
}
public override ImageData Read (IBinaryStream file, ImageMetaData info)
{
var reader = new UgReader (file, info);
return reader.Unpack();
}
public override void Write (Stream file, ImageData image)
{
throw new System.NotImplementedException ("UgFormat.Write not implemented");
}
}
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/// <summary>
/// Same compression algorithm as the base, but scanlines are vertical
/// </summary>
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internal class UgReader : System98.GraBaseReader
{
public UgReader (IBinaryStream input, ImageMetaData info) : base (input, info)
{
}
public ImageData Unpack ()
{
m_input.Position = 8;
var palette = ReadPalette();
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m_input.Position = 0x28;
try
{
UnpackBitsInternal();
}
catch (EndOfStreamException)
{
FlushBuffer();
}
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return ImageData.Create (m_info, PixelFormats.Indexed4, palette, Pixels, Stride);
}
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void UnpackBitsInternal ()
{
int height = m_info.iHeight;
int hTimes2 = height << 1;
int hTimes4 = height << 2;
int buffer_size = hTimes4 * 3;
m_buffer = new ushort[buffer_size >> 1];
m_dst = 0;
InitFrame();
InitBitReader();
ushort p = ReadPair (0);
for (int i = 0; i < hTimes2+1; ++i)
m_buffer[i] = p;
int dst = hTimes4;
int prev_src = 0;
while (m_dst < m_pixels.Length)
{
bool same_line = false;
int src = -hTimes2;
if (GetNextBit() != 0) // @1@
{
if (GetNextBit() == 0) // @4@
src += 4;
else if (GetNextBit() == 0) // @5@
src -= 4;
else
src <<= 1;
}
else if (GetNextBit() == 0) // @2@
{
src = -4;
p = m_buffer[dst/2-1];
if ((p & 0xFF) == (p >> 8))
same_line = src != prev_src;
}
if (src != prev_src) // @6@
{
prev_src = src;
if (!same_line)
src += dst;
else
src = dst - 2;
if (GetNextBit() != 0) // @3@
{
int bitlength = 0;
do
{
++bitlength;
}
while (GetNextBit() != 0);
int count = 1;
while (bitlength --> 0)
count = count << 1 | GetNextBit();
MovePixels (m_buffer, src, dst, count);
dst += count << 1;
if (dst == buffer_size)
{
if (FlushBuffer())
return;
dst = hTimes4;
}
}
else
{
MovePixels (m_buffer, src, dst, 1);
dst += 2;
if (dst == buffer_size)
{
if (FlushBuffer())
return;
dst = hTimes4;
}
}
}
else
{
p = m_buffer[dst/2-1];
do
{
byte prev = (byte)(p >> 8);
p = ReadPair (prev);
m_buffer[dst >> 1] = p;
dst += 2;
if (dst == buffer_size)
{
if (FlushBuffer())
return;
dst = hTimes4;
}
}
while (GetNextBit() != 0);
prev_src = 0;
}
}
}
bool FlushBuffer ()
{
int height = m_info.iHeight;
int src_line = height << 1;
int dst = m_dst;
for (int i = 0; i < height; ++i)
{
int src = src_line;
for (int j = 0; j < 4; ++j)
{
ushort p = m_buffer[src];
m_pixels[dst+j] = (byte)((p & 0xF0) | p >> 12);
src += height;
}
src_line++;
dst += m_output_stride;
}
m_dst += 4;
MovePixels (m_buffer, height << 3, 0, height << 1);
return m_dst >= m_output_stride;
}
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BitmapPalette ReadPalette ()
{
var colors = new Color[16];
for (int i = 0; i < 16; ++i)
{
ushort rgb = m_input.ReadUInt16();
int b = (rgb & 0xF) * 0x11;
int r = ((rgb >> 4) & 0xF) * 0x11;
int g = ((rgb >> 8) & 0xF) * 0x11;
colors[i] = Color.FromRgb ((byte)r, (byte)g, (byte)b);
}
return new BitmapPalette (colors);
}
}
}