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Optimize writing Blu-ray .sup files

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This commit is contained in:
Nikolaj Olsson 2020-12-30 17:28:01 +01:00
parent da08d7b43b
commit f5538b760b
1 changed files with 22 additions and 4 deletions
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26
src/libse/BluRaySup/BluRaySupPicture.cs
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@ -99,6 +99,16 @@ namespace Nikse.SubtitleEdit.Core.BluRaySup
/// <returns>RLE buffer</returns>
private static byte[] EncodeImage(NikseBitmap bm, List<Color> palette)
{
var lookup = new Dictionary<int, int>();
for (int i = 0; i < palette.Count; i++)
{
var color = palette[i].ToArgb();
if (!lookup.ContainsKey(color))
{
lookup.Add(color, i);
}
}
var bytes = new List<byte>();
for (int y = 0; y < bm.Height; y++)
{
@ -108,10 +118,9 @@ namespace Nikse.SubtitleEdit.Core.BluRaySup
{
Color c = bm.GetPixel(x, y);
byte color;
var idx = palette.IndexOf(c);
if (idx >= 0)
if (lookup.TryGetValue(c.ToArgb(), out int intC))
{
color = (byte)idx;
color = (byte)intC;
}
else
{
@ -228,6 +237,7 @@ namespace Nikse.SubtitleEdit.Core.BluRaySup
private static List<Color> GetBitmapPalette(NikseBitmap bitmap)
{
var pal = new List<Color>();
var lookup = new HashSet<int>();
for (int y = 0; y < bitmap.Height; y++)
{
for (int x = 0; x < bitmap.Width; x++)
@ -235,11 +245,16 @@ namespace Nikse.SubtitleEdit.Core.BluRaySup
var c = bitmap.GetPixel(x, y);
if (c != Color.Transparent)
{
if (pal.Count < 100)
if (lookup.Contains(c.ToArgb()))
{
// exact color already exists
}
else if (pal.Count < 100)
{
if (!HasCloseColor(c, pal, 1))
{
pal.Add(c);
lookup.Add(c.ToArgb());
}
}
else if (pal.Count < 240)
@ -247,15 +262,18 @@ namespace Nikse.SubtitleEdit.Core.BluRaySup
if (!HasCloseColor(c, pal, 5))
{
pal.Add(c);
lookup.Add(c.ToArgb());
}
}
else if (pal.Count < 254 && !HasCloseColor(c, pal, 25))
{
pal.Add(c);
lookup.Add(c.ToArgb());
}
}
}
}
pal.Add(Color.Transparent); // last entry must be transparent
return pal;
}