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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) public int ReadVarInt(bool optimizePositive = true)
{ {
byte b = ReadByte(); byte b = ReadByte();
uint val = b & 0x7FU; int val = b & 0x7F;
if ((b & 0x80) != 0) if ((b & 0x80) != 0)
{ {
b = ReadByte(); b = ReadByte();
val |= (b & 0x7FU) << 7; val |= (b & 0x7F) << 7;
if ((b & 0x80) != 0) if ((b & 0x80) != 0)
{ {
b = ReadByte(); b = ReadByte();
val |= (b & 0x7FU) << 14; val |= (b & 0x7F) << 14;
if ((b & 0x80) != 0) if ((b & 0x80) != 0)
{ {
b = ReadByte(); b = ReadByte();
val |= (b & 0x7FU) << 21; val |= (b & 0x7F) << 21;
if ((b & 0x80) != 0) 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() public string ReadString()
{ {
@@ -218,30 +220,31 @@ namespace SpineViewer.Spine
} }
public void WriteVarInt(int val, bool optimizePositive = true) 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); if (!optimizePositive) val = (val << 1) ^ (val >> 31);
uint v = (uint)val;
byte b = (byte)(v & 0x7F); byte b = (byte)(val & 0x7F);
v >>= 7; val >>>= 7;
if (v != 0) if (val != 0)
{ {
output.WriteByte((byte)(b | 0x80)); output.WriteByte((byte)(b | 0x80));
b = (byte)(v & 0x7F); b = (byte)(val & 0x7F);
v >>= 7; val >>>= 7;
if (v != 0) if (val != 0)
{ {
output.WriteByte((byte)(b | 0x80)); output.WriteByte((byte)(b | 0x80));
b = (byte)(v & 0x7F); b = (byte)(val & 0x7F);
v >>= 7; val >>>= 7;
if (v != 0) if (val != 0)
{ {
output.WriteByte((byte)(b | 0x80)); output.WriteByte((byte)(b | 0x80));
b = (byte)(v & 0x7F); b = (byte)(val & 0x7F);
v >>= 7; val >>>= 7;
if (v != 0) if (val != 0)
{ {
output.WriteByte((byte)(b | 0x80)); output.WriteByte((byte)(b | 0x80));
b = (byte)(v & 0x7F); b = (byte)(val & 0x7F);
} }
} }
} }