GARbro-mirror/ArcFormats/Macromedia/ImageBITD.cs

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//! \file ImageBITD.cs
//! \date Fri Jun 26 07:45:01 2015
//! \brief Macromedia Director image format.
//
// Copyright (C) 2015-2023 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.
//
using System;
using System.Collections.Generic;
using System.ComponentModel.Composition;
using System.IO;
using System.Linq;
using System.Windows.Media;
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using System.Windows.Media.Imaging;
using GameRes.Utility;
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namespace GameRes.Formats.Macromedia
{
internal class BitdMetaData : ImageMetaData
{
public byte DepthType;
}
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internal class BitdDecoder : IImageDecoder
{
Stream m_input;
byte[] m_output;
int m_width;
int m_height;
int m_stride;
ImageMetaData m_info;
ImageData m_image;
BitmapPalette m_palette;
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public Stream Source => m_input;
public ImageFormat SourceFormat { get; private set; }
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public ImageMetaData Info => m_info;
public ImageData Image => m_image ?? (m_image = GetImageData());
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public PixelFormat Format { get; private set; }
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public byte[] AlphaChannel { get; set; }
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public BitdDecoder (Stream input, BitdMetaData info, BitmapPalette palette)
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{
m_input = input;
m_info = info;
m_width = info.iWidth;
m_height = info.iHeight;
m_stride = (m_width * m_info.BPP + 7) / 8;
m_stride = (m_stride + 1) & ~1;
m_output = new byte[m_stride * m_height];
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Format = info.BPP == 2 ? PixelFormats.Indexed2
: info.BPP == 4 ? PixelFormats.Indexed4
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: info.BPP == 8 ? PixelFormats.Indexed8
: info.BPP == 16 ? PixelFormats.Bgr555
: info.DepthType == 0x87 // i have no clue what this is
|| info.DepthType == 0x8A ? PixelFormats.Bgra32 // depth type 0x87/0x8A
: PixelFormats.Bgra32; // depth type 0x82/84/85/86/8C
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m_palette = palette;
}
private BitdDecoder (Stream input, ImageMetaData info, byte[] alpha_channel)
{
m_input = input;
m_info = info;
m_width = info.iWidth;
m_height = info.iHeight;
m_stride = (m_width * m_info.BPP + 7) / 8;
Format = PixelFormats.Bgra32;
AlphaChannel = alpha_channel;
SourceFormat = ImageFormat.Jpeg;
}
public static IImageDecoder FromJpeg (Stream input, ImageMetaData info, byte[] alpha_channel)
{
return new BitdDecoder (input, info, alpha_channel);
}
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protected ImageData GetImageData ()
{
BitmapSource bitmap = null;
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m_input.Position = 0;
if (SourceFormat == ImageFormat.Jpeg)
{
var decoder = new JpegBitmapDecoder (m_input, BitmapCreateOptions.None, BitmapCacheOption.OnLoad);
bitmap = decoder.Frames[0];
if (null == AlphaChannel)
return new ImageData (bitmap, m_info);
}
else if (Info.BPP > 8)
UnpackChannels (Info.BPP / 8);
else if (m_output.Length != m_input.Length)
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Unpack8bpp();
else
m_input.Read (m_output, 0, m_output.Length);
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if (AlphaChannel != null)
{
if (Info.BPP != 32 || bitmap != null)
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{
if (bitmap == null)
bitmap = BitmapSource.Create (m_width, m_height, ImageData.DefaultDpiX, ImageData.DefaultDpiY, Format, m_palette, m_output, m_stride);
if (Info.BPP != 32)
bitmap = new FormatConvertedBitmap (bitmap, PixelFormats.Bgr32, null, 0);
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m_stride = bitmap.PixelWidth * 4;
m_output = new byte[bitmap.PixelHeight * m_stride];
bitmap.CopyPixels (m_output, m_stride, 0);
}
ApplyAlphaChannel (AlphaChannel);
Format = PixelFormats.Bgra32;
}
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return ImageData.Create (m_info, Format, m_palette, m_output, m_stride);
}
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void ApplyAlphaChannel (byte[] alpha)
{
int alpha_stride = (m_width + 1) & ~1;
int src = 0;
int pdst = 3;
for (int y = 0; y < m_height; ++y)
{
int dst = pdst;
for (int x = 0; x < m_width; ++x)
{
m_output[dst] = alpha[src+x];
dst += 4;
}
src += alpha_stride;
pdst += m_stride;
}
}
public byte[] Unpack8bpp ()
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{
for (int line = 0; line < m_output.Length; line += m_stride)
{
UnpackScanLine (m_output, line);
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}
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return m_output;
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}
public void UnpackChannels (int channels)
{
var scan_line = new byte[m_stride];
for (int line = 0; line < m_output.Length; line += m_stride)
{
UnpackScanLine (scan_line, 0);
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int dst = line;
for (int i = 0; i < m_width; ++i)
{
for (int src = m_width * (channels - 1); src >= 0; src -= m_width)
m_output[dst++] = scan_line[i + src];
}
}
}
void UnpackScanLine (byte[] scan_line, int pos)
{
int x = 0;
while (x < m_stride)
{
int b = m_input.ReadByte();
if (-1 == b)
break; // one in 5000 images somehow stumbles here
int count = b;
if (b > 0x7f)
count = (byte)-(sbyte)b;
++count;
if (x + count > m_stride)
throw new InvalidFormatException();
if (b > 0x7f)
{
b = m_input.ReadByte();
if (-1 == b)
throw new InvalidFormatException ("Unexpected end of file");
for (int i = 0; i < count; ++i)
scan_line[pos + x++] = (byte)b;
}
else
{
m_input.Read (scan_line, pos+x, count);
x += count;
}
}
}
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#region IDisposable Members
bool m_disposed = false;
public void Dispose ()
{
if (!m_disposed)
{
m_input.Dispose();
m_disposed = true;
}
GC.SuppressFinalize (this);
}
#endregion
}
}