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(UG): properly implemented format.

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This commit is contained in:
morkt 2023-10-27 04:14:57 +04:00
parent 0758496dd8
commit 6981d3bf82
1 changed files with 131 additions and 1 deletions
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132
Legacy/Ucom/ImageUG.cs
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@ -23,6 +23,7 @@
// IN THE SOFTWARE.
//
using System;
using System.ComponentModel.Composition;
using System.IO;
using System.Windows.Media;
@ -73,6 +74,9 @@ namespace GameRes.Formats.Ucom
}
}
/// <summary>
/// Same compression algorithm as the base, but scanlines are vertical
/// </summary>
internal class UgReader : System98.GraBaseReader
{
public UgReader (IBinaryStream input, ImageMetaData info) : base (input, info)
@ -83,10 +87,136 @@ namespace GameRes.Formats.Ucom
{
m_input.Position = 8;
var palette = ReadPalette();
UnpackBits();
m_input.Position = 0x28;
try
{
UnpackBitsInternal();
}
catch (EndOfStreamException)
{
FlushBuffer();
}
return ImageData.Create (m_info, PixelFormats.Indexed4, palette, Pixels, Stride);
}
void UnpackBitsInternal ()
{
int height = m_info.iHeight;
int hTimes2 = height << 1;
int hTimes4 = height << 2;
int buffer_size = hTimes4 * 3;
m_buffer = new ushort[buffer_size >> 1];
m_dst = 0;
InitFrame();
InitBitReader();
ushort p = ReadPair (0);
for (int i = 0; i < hTimes2+1; ++i)
m_buffer[i] = p;
int dst = hTimes4;
int prev_src = 0;
while (m_dst < m_pixels.Length)
{
bool same_line = false;
int src = -hTimes2;
if (GetNextBit() != 0) // @1@
{
if (GetNextBit() == 0) // @4@
src += 4;
else if (GetNextBit() == 0) // @5@
src -= 4;
else
src <<= 1;
}
else if (GetNextBit() == 0) // @2@
{
src = -4;
p = m_buffer[dst/2-1];
if ((p & 0xFF) == (p >> 8))
same_line = src != prev_src;
}
if (src != prev_src) // @6@
{
prev_src = src;
if (!same_line)
src += dst;
else
src = dst - 2;
if (GetNextBit() != 0) // @3@
{
int bitlength = 0;
do
{
++bitlength;
}
while (GetNextBit() != 0);
int count = 1;
while (bitlength --> 0)
count = count << 1 | GetNextBit();
MovePixels (m_buffer, src, dst, count);
dst += count << 1;
if (dst == buffer_size)
{
if (FlushBuffer())
return;
dst = hTimes4;
}
}
else
{
MovePixels (m_buffer, src, dst, 1);
dst += 2;
if (dst == buffer_size)
{
if (FlushBuffer())
return;
dst = hTimes4;
}
}
}
else
{
p = m_buffer[dst/2-1];
do
{
byte prev = (byte)(p >> 8);
p = ReadPair (prev);
m_buffer[dst >> 1] = p;
dst += 2;
if (dst == buffer_size)
{
if (FlushBuffer())
return;
dst = hTimes4;
}
}
while (GetNextBit() != 0);
prev_src = 0;
}
}
}
bool FlushBuffer ()
{
int height = m_info.iHeight;
int src_line = height << 1;
int dst = m_dst;
for (int i = 0; i < height; ++i)
{
int src = src_line;
for (int j = 0; j < 4; ++j)
{
ushort p = m_buffer[src];
m_pixels[dst+j] = (byte)((p & 0xF0) | p >> 12);
src += height;
}
src_line++;
dst += m_output_stride;
}
m_dst += 4;
MovePixels (m_buffer, height << 3, 0, height << 1);
return m_dst >= m_output_stride;
}
BitmapPalette ReadPalette ()
{
var colors = new Color[16];