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(EPA): implemented 8bpp images with alpha channel.

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This commit is contained in:
morkt 2018-03-11 21:03:10 +04:00
parent 5202988b48
commit eafe023de9
1 changed files with 74 additions and 57 deletions
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131
ArcFormats/Pajamas/ImageEPA.cs
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@ -82,26 +82,26 @@ namespace GameRes.Formats.Pajamas
public override ImageData Read (IBinaryStream file, ImageMetaData info)
{
var meta = (EpaMetaData)info;
file.Position = 2 == meta.Mode ? 0x18 : 0x10;
var reader = new Reader (file.AsStream, meta);
var reader = new Reader (file, (EpaMetaData)info);
reader.Unpack();
return ImageData.Create (meta, reader.Format, reader.Palette, reader.Data);
return ImageData.Create (info, reader.Format, reader.Palette, reader.Data);
}
internal class Reader
{
private Stream m_input;
private IBinaryStream m_input;
private int m_start_pos;
private int m_width;
private int m_height;
private int m_pixel_size;
private byte[] m_output;
private bool m_has_alpha;
public PixelFormat Format { get; private set; }
public BitmapPalette Palette { get; private set; }
public byte[] Data { get { return m_output; } }
public Reader (Stream stream, EpaMetaData info)
public Reader (IBinaryStream stream, EpaMetaData info)
{
m_input = stream;
switch (info.ColorType)
@ -110,70 +110,55 @@ namespace GameRes.Formats.Pajamas
case 1: m_pixel_size = 3; Format = PixelFormats.Bgr24; break;
case 2: m_pixel_size = 4; Format = PixelFormats.Bgra32; break;
case 3: m_pixel_size = 2; Format = PixelFormats.Bgr555; break;
case 4: m_pixel_size = 1; Format = PixelFormats.Indexed8; break;
case 4: m_pixel_size = 1; Format = PixelFormats.Bgra32; m_has_alpha = true; break;
default: throw new NotSupportedException ("Not supported EPA color depth");
}
m_width = (int)info.Width;
m_height = (int)info.Height;
m_output = new byte[info.Width*info.Height*m_pixel_size];
if (8 == info.BPP)
Palette = ImageFormat.ReadPalette (m_input, 0x100, PaletteFormat.Bgr);
m_start_pos = 2 == info.Mode ? 0x18 : 0x10;
}
int[] m_offset_table = new int[16];
public void Unpack ()
{
int dst = 0;
var offset_table = new int[16];
m_input.Position = m_start_pos;
if (1 == m_pixel_size)
Palette = ImageFormat.ReadPalette (m_input.AsStream, 0x100, PaletteFormat.Bgr);
m_offset_table[0] = 0;
m_offset_table[1] = 1;
m_offset_table[2] = m_width;
m_offset_table[3] = m_width + 1;
m_offset_table[4] = 2;
m_offset_table[5] = m_width - 1;
m_offset_table[6] = m_width * 2;
m_offset_table[7] = 3;
m_offset_table[8] = (m_width + 1) * 2;
m_offset_table[9] = m_width + 2;
m_offset_table[10] = m_width * 2 + 1;
m_offset_table[11] = m_width * 2 - 1;
m_offset_table[12] = (m_width - 1) * 2;
m_offset_table[13] = m_width - 2;
m_offset_table[14] = m_width * 3;
m_offset_table[15] = 4;
offset_table[0] = 0;
offset_table[1] = 1;
offset_table[2] = m_width;
offset_table[3] = m_width + 1;
offset_table[4] = 2;
offset_table[5] = m_width - 1;
offset_table[6] = m_width * 2;
offset_table[7] = 3;
offset_table[8] = (m_width + 1) * 2;
offset_table[9] = m_width + 2;
offset_table[10] = m_width * 2 + 1;
offset_table[11] = m_width * 2 - 1;
offset_table[12] = (m_width - 1) * 2;
offset_table[13] = m_width - 2;
offset_table[14] = m_width * 3;
offset_table[15] = 4;
while (dst < m_output.Length)
UnpackChannel (m_output);
if (m_has_alpha)
{
int flag = m_input.ReadByte();
if (-1 == flag)
throw new InvalidFormatException ("Unexpected end of file");
if (0 == (flag & 0xf0))
var alpha = new byte[m_output.Length];
UnpackChannel (alpha);
var bitmap = new byte[m_width * m_height * 4];
int dst = 0;
for (int src = 0; src < m_output.Length; ++src)
{
int count = flag;
if (dst + count > m_output.Length)
count = m_output.Length - dst;
if (count != m_input.Read (m_output, dst, count))
throw new InvalidFormatException ("Unexpected end of file");
dst += count;
}
else
{
int count;
if (0 != (flag & 8))
{
count = m_input.ReadByte();
if (-1 == count)
throw new InvalidFormatException ("Unexpected end of file");
count += (flag & 7) << 8;
}
else
count = flag & 7;
if (dst + count > m_output.Length)
break;
Binary.CopyOverlapped (m_output, dst-offset_table[flag >> 4], dst, count);
dst += count;
var color = Palette.Colors[m_output[src]];
bitmap[dst++] = color.B;
bitmap[dst++] = color.G;
bitmap[dst++] = color.R;
bitmap[dst++] = alpha[src];
}
m_output = bitmap;
}
if (m_pixel_size > 1)
{
@ -195,6 +180,38 @@ namespace GameRes.Formats.Pajamas
m_output = bitmap;
}
}
void UnpackChannel (byte[] output)
{
int dst = 0;
while (dst < output.Length)
{
int count;
int flag = m_input.ReadUInt8();
if (0 == (flag & 0xF0))
{
count = flag;
if (dst + count > output.Length)
count = output.Length - dst;
if (count != m_input.Read (output, dst, count))
throw new InvalidFormatException ("Unexpected end of file");
}
else
{
if (0 != (flag & 8))
{
count = m_input.ReadUInt8();
count += (flag & 7) << 8;
}
else
count = flag & 7;
if (dst + count > output.Length)
break;
Binary.CopyOverlapped (output, dst-m_offset_table[flag >> 4], dst, count);
}
dst += count;
}
}
}
}
}