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(IafFormat): new file layout variant.

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recognize bitmaps with appended alpha-channel.
This commit is contained in:
morkt 2015-07-25 03:57:47 +04:00
parent 8dabf68291
commit ca42a0cfa4
1 changed files with 88 additions and 18 deletions
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106
ArcFormats/ImageIAF.cs
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@ -26,12 +26,15 @@
using System;
using System.ComponentModel.Composition;
using System.IO;
using System.Windows.Media;
using GameRes.Utility;
namespace GameRes.Formats.Triangle
{
internal class IafMetaData : ImageMetaData
{
public int DataOffset;
public int PackedSize;
public int UnpackedSize;
public int PackType;
}
@ -45,16 +48,35 @@ namespace GameRes.Formats.Triangle
public override ImageMetaData ReadMetaData (Stream stream)
{
var header = new byte[12];
if (header.Length != stream.Read (header, 0, header.Length))
var header = new byte[0x14];
if (12 != stream.Read (header, 0, 12))
return null;
int x = LittleEndian.ToInt32 (header, 0);
int y = LittleEndian.ToInt32 (header, 4);
int data_offset;
int packed_size = LittleEndian.ToInt32 (header, 1);
int x, y, unpacked_size;
if (5+packed_size+0x14 == stream.Length)
{
data_offset = 5;
stream.Seek (-0x14, SeekOrigin.End);
if (0x14 != stream.Read (header, 0, 0x14))
return null;
x = LittleEndian.ToInt32 (header, 0);
y = LittleEndian.ToInt32 (header, 4);
unpacked_size = LittleEndian.ToInt32 (header, 0x10);
}
else
{
data_offset = 12;
x = LittleEndian.ToInt32 (header, 0);
y = LittleEndian.ToInt32 (header, 4);
unpacked_size = LittleEndian.ToInt32 (header, 8);
packed_size = (int)stream.Length-12;
}
if (Math.Abs (x) > 4096 || Math.Abs (y) > 4096)
return null;
int unpacked_size = LittleEndian.ToInt32 (header, 8);
int pack_type = (unpacked_size >> 30) & 3;
unpacked_size &= (int)~0xC0000000;
stream.Position = data_offset;
byte[] bmp;
if (0 == pack_type)
{
@ -93,6 +115,8 @@ namespace GameRes.Formats.Triangle
OffsetX = x,
OffsetY = y,
BPP = bpp,
DataOffset = data_offset,
PackedSize = packed_size,
UnpackedSize = unpacked_size,
PackType = pack_type,
};
@ -104,38 +128,60 @@ namespace GameRes.Formats.Triangle
if (null == meta)
throw new ArgumentException ("IafFormat.Read should be supplied with IafMetaData", "info");
stream.Position = 12;
int packed_size = (int)stream.Length-12;
byte[] pixels;
stream.Position = meta.DataOffset;
byte[] bitmap;
if (2 == meta.PackType)
{
using (var reader = new RleReader (stream, packed_size, meta.UnpackedSize))
using (var reader = new RleReader (stream, meta.PackedSize, meta.UnpackedSize))
{
reader.Unpack();
pixels = reader.Data;
bitmap = reader.Data;
}
}
else if (0 == meta.PackType)
{
using (var reader = new LzssReader (stream, packed_size, meta.UnpackedSize))
using (var reader = new LzssReader (stream, meta.PackedSize, meta.UnpackedSize))
{
reader.Unpack();
pixels = reader.Data;
bitmap = reader.Data;
}
}
else
{
pixels = new byte[meta.UnpackedSize];
if (pixels.Length != stream.Read (pixels, 0, pixels.Length))
bitmap = new byte[meta.UnpackedSize];
if (bitmap.Length != stream.Read (bitmap, 0, bitmap.Length))
throw new InvalidFormatException ("Unexpected end of file");
}
if ('C' == pixels[0])
if ('C' == bitmap[0])
{
pixels[0] = (byte)'B';
bitmap[0] = (byte)'B';
if (info.BPP > 8)
pixels = ConvertCM (pixels, (int)info.Width, (int)info.Height, info.BPP);
bitmap = ConvertCM (bitmap, (int)info.Width, (int)info.Height, info.BPP);
}
using (var bmp = new MemoryStream (pixels))
if (meta.BPP >= 24) // currently alpha channel could be applied to 24+bpp bitmaps only
{
try
{
int bmp_size = LittleEndian.ToInt32 (bitmap, 2);
if (bitmap.Length - bmp_size > 0x36) // size of bmp header
{
if ('B' == bitmap[bmp_size] && 'M' == bitmap[bmp_size+1] &&
8 == bitmap[bmp_size+0x1c]) // 8bpp
{
uint alpha_width = LittleEndian.ToUInt32 (bitmap, bmp_size+0x12);
uint alpha_height = LittleEndian.ToUInt32 (bitmap, bmp_size+0x16);
if (info.Width == alpha_width && info.Height == alpha_height)
return BitmapWithAlphaChannel (meta, bitmap, bmp_size);
}
}
}
catch
{
// ignore any errors occured during alpha-channel read attempt,
// fallback to a plain bitmap
}
}
using (var bmp = new MemoryStream (bitmap))
return base.Read (bmp, info);
}
@ -144,6 +190,30 @@ namespace GameRes.Formats.Triangle
throw new System.NotImplementedException ("IafFormat.Write not implemented");
}
static ImageData BitmapWithAlphaChannel (ImageMetaData info, byte[] bitmap, int alpha_offset)
{
int src_pixel_size = info.BPP/8;
int src_stride = (int)info.Width*src_pixel_size;
int src_pixels = LittleEndian.ToInt32 (bitmap, 0x0A);
int src_alpha = alpha_offset + LittleEndian.ToInt32 (bitmap, alpha_offset+0x0A);
var pixels = new byte[info.Width * info.Height * 4];
int dst = 0;
for (int y = (int)info.Height-1; y >= 0; --y)
{
int src = src_pixels + y*src_stride;
int alpha = src_alpha + y*(int)info.Width;
for (uint x = 0; x < info.Width; ++x)
{
pixels[dst++] = bitmap[src];
pixels[dst++] = bitmap[src+1];
pixels[dst++] = bitmap[src+2];
pixels[dst++] = (byte)~bitmap[alpha++];
src += src_pixel_size;
}
}
return ImageData.Create (info, PixelFormats.Bgra32, null, pixels);
}
static byte[] ConvertCM (byte[] input, int width, int height, int bpp)
{
int src = LittleEndian.ToInt32 (input, 0x0a);