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(BITD): support alpha channel.

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This commit is contained in:
morkt 2023-09-07 12:08:49 +04:00
parent 4aeec4f6a4
commit 7f347c5e46
1 changed files with 41 additions and 6 deletions
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47
ArcFormats/Macromedia/ImageBITD.cs
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@ -215,11 +215,12 @@ namespace GameRes.Formats.Macromedia
ImageData m_image;
BitmapPalette m_palette;
public Stream Source { get => m_input; }
public ImageFormat SourceFormat { get => null; }
public ImageMetaData Info { get => m_info; }
public ImageData Image { get => m_image ?? (m_image = GetImageData()); }
public Stream Source => m_input;
public ImageFormat SourceFormat => null;
public ImageMetaData Info => m_info;
public ImageData Image => m_image ?? (m_image = GetImageData());
public PixelFormat Format { get; private set; }
public byte[] AlphaChannel { get; set; }
public BitdDecoder (Stream input, ImageMetaData info, BitmapPalette palette)
{
@ -230,7 +231,8 @@ namespace GameRes.Formats.Macromedia
m_stride = (m_width * m_info.BPP + 7) / 8;
m_stride = (m_stride + 1) & ~1;
m_output = new byte[m_stride * m_height];
Format = info.BPP == 4 ? PixelFormats.Indexed4
Format = info.BPP == 2 ? PixelFormats.Indexed2
: info.BPP == 4 ? PixelFormats.Indexed4
: info.BPP == 8 ? PixelFormats.Indexed8
: info.BPP == 16 ? PixelFormats.Bgr555
: PixelFormats.Bgr32;
@ -239,14 +241,46 @@ namespace GameRes.Formats.Macromedia
protected ImageData GetImageData ()
{
m_input.Position = 0;
if (Info.BPP <= 8)
Unpack8bpp();
else
UnpackChannels (Info.BPP / 8);
if (AlphaChannel != null)
{
if (Info.BPP != 32)
{
BitmapSource bitmap = BitmapSource.Create (Info.iWidth, Info.iHeight, ImageData.DefaultDpiX, ImageData.DefaultDpiY, Format, m_palette, m_output, m_stride);
bitmap = new FormatConvertedBitmap (bitmap, PixelFormats.Bgr32, null, 0);
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;
}
return ImageData.Create (m_info, Format, m_palette, m_output, m_stride);
}
void Unpack8bpp ()
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 ()
{
for (int line = 0; line < m_output.Length; line += m_stride)
{
@ -277,6 +311,7 @@ namespace GameRes.Formats.Macromedia
}
}
}
return m_output;
}
public void UnpackChannels (int channels)