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optimize

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This commit is contained in:
ww-rm
2025-03-13 10:32:18 +08:00
parent c920471c0c
commit 63a937a45b
1 changed files with 24 additions and 21 deletions
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45
SpineViewer/Spine/SkeletonConverter.cs
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@@ -123,26 +123,28 @@ namespace SpineViewer.Spine
public int ReadVarInt(bool optimizePositive = true)
{
byte b = ReadByte();
uint val = b & 0x7FU;
int val = b & 0x7F;
if ((b & 0x80) != 0)
{
b = ReadByte();
val |= (b & 0x7FU) << 7;
val |= (b & 0x7F) << 7;
if ((b & 0x80) != 0)
{
b = ReadByte();
val |= (b & 0x7FU) << 14;
val |= (b & 0x7F) << 14;
if ((b & 0x80) != 0)
{
b = ReadByte();
val |= (b & 0x7FU) << 21;
val |= (b & 0x7F) << 21;
if ((b & 0x80) != 0)
val |= (ReadByte() & 0x7FU) << 28;
val |= (ReadByte() & 0x7F) << 28;
}
}
}
if (!optimizePositive) val = (val >> 1) ^ (uint)-(val & 1);
return (int)val;
// 最低位是符号, 根据符号得到全 1 或全 0
// 无符号右移, 符号按原样设置在最高位, 其他位与符号异或
return optimizePositive ? val : (val >>> 1) ^ -(val & 1);
}
public string ReadString()
{
@@ -218,30 +220,31 @@ namespace SpineViewer.Spine
}
public void WriteVarInt(int val, bool optimizePositive = true)
{
// 有符号右移, 会变成全 1 或者全 0 符号
// 其他位与符号异或, 符号按原样设置在最低位
if (!optimizePositive) val = (val << 1) ^ (val >> 31);
uint v = (uint)val;
byte b = (byte)(v & 0x7F);
v >>= 7;
if (v != 0)
byte b = (byte)(val & 0x7F);
val >>>= 7;
if (val != 0)
{
output.WriteByte((byte)(b | 0x80));
b = (byte)(v & 0x7F);
v >>= 7;
if (v != 0)
b = (byte)(val & 0x7F);
val >>>= 7;
if (val != 0)
{
output.WriteByte((byte)(b | 0x80));
b = (byte)(v & 0x7F);
v >>= 7;
if (v != 0)
b = (byte)(val & 0x7F);
val >>>= 7;
if (val != 0)
{
output.WriteByte((byte)(b | 0x80));
b = (byte)(v & 0x7F);
v >>= 7;
if (v != 0)
b = (byte)(val & 0x7F);
val >>>= 7;
if (val != 0)
{
output.WriteByte((byte)(b | 0x80));
b = (byte)(v & 0x7F);
b = (byte)(val & 0x7F);
}
}
}