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(MGD): check if image has non-zero alpha channel.

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This commit is contained in:
morkt 2018-07-15 00:17:25 +04:00
parent 75fdb25bc8
commit e80bf87cba
1 changed files with 27 additions and 9 deletions
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36
ArcFormats/NSystem/ImageMGD.cs
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@ -23,7 +23,6 @@
// IN THE SOFTWARE.
//
using System;
using System.ComponentModel.Composition;
using System.IO;
using System.Windows.Media;
@ -47,7 +46,7 @@ namespace GameRes.Formats.NSystem
public override ImageMetaData ReadMetaData (IBinaryStream file)
{
var header = file.ReadHeader (0x1A);
var header = file.ReadHeader (0x1C);
int header_size = header.ToUInt16 (4);
uint width = header.ToUInt16 (0xC);
uint height = header.ToUInt16 (0xE);
@ -74,14 +73,25 @@ namespace GameRes.Formats.NSystem
switch (meta.Mode)
{
case 0:
var pixels = file.ReadBytes (data_size);
return ImageData.Create (info, PixelFormats.Bgra32, null, pixels);
{
var pixels = file.ReadBytes (data_size);
var format = PixelFormats.Bgr32;
for (int i = 3; i < data_size; i += 4)
{
if (pixels[i] != 0)
{
format = PixelFormats.Bgra32;
break;
}
}
return ImageData.Create (info, format, null, pixels);
}
case 1:
{
var decoder = new MgdDecoder (file, meta, data_size);
decoder.Unpack();
return ImageData.Create (info, PixelFormats.Bgra32, null, decoder.Data);
return ImageData.Create (info, decoder.Format, null, decoder.Data);
}
case 2:
@ -113,23 +123,28 @@ namespace GameRes.Formats.NSystem
public byte[] Data { get { return m_output; } }
public PixelFormat Format { get; private set; }
public MgdDecoder (IBinaryStream input, MgdMetaData info, int packed_size)
{
m_input = input;
m_info = info;
m_output = new byte[m_info.UnpackedSize];
Format = PixelFormats.Bgra32;
}
public void Unpack ()
{
int alpha_size = m_input.ReadInt32();
UnpackAlpha (alpha_size);
if (!UnpackAlpha (alpha_size))
Format = PixelFormats.Bgr32;
int rgb_size = m_input.ReadInt32();
UnpackColor (rgb_size);
}
void UnpackAlpha (int length)
bool UnpackAlpha (int length)
{
bool has_alpha = false;
int dst = 3;
while (length > 0)
{
@ -139,6 +154,7 @@ namespace GameRes.Formats.NSystem
{
count = (count & 0x7FFF) + 1;
byte a = m_input.ReadUInt8();
has_alpha = has_alpha || a != 0;
length--;
for (int i = 0; i < count; ++i)
{
@ -150,13 +166,15 @@ namespace GameRes.Formats.NSystem
{
for (int i = 0; i < count; ++i)
{
m_output[dst] = m_input.ReadUInt8();
byte a = m_input.ReadUInt8();
has_alpha = has_alpha || a != 0;
m_output[dst] = a;
dst += 4;
}
length -= count;
}
}
return has_alpha;
}
void UnpackColor (int length)