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Extract conversion from u16 fixed-point to float

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PR #3369 <https://github.com/Genymobile/scrcpy/pull/3369>
This commit is contained in:
Romain Vimont 2022-07-24 16:00:26 +02:00
parent 5b8e9aa0e9
commit 3848ce86f1
2 changed files with 13 additions and 4 deletions
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12
server/src/main/java/com/genymobile/scrcpy/Binary.java
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@ -12,4 +12,16 @@ public final class Binary {
public static int toUnsigned(byte value) {
return value & 0xff;
}
/**
* Convert unsigned 16-bit fixed-point to a float between 0 and 1
*
* @param value encoded value
* @return Float value between 0 and 1
*/
public static float u16FixedPointToFloat(short value) {
int unsignedShort = Binary.toUnsigned(value);
// 0x1p16f is 2^16 as float
return unsignedShort == 0xffff ? 1f : (unsignedShort / 0x1p16f);
}
}

5
server/src/main/java/com/genymobile/scrcpy/ControlMessageReader.java
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@ -139,10 +139,7 @@ public class ControlMessageReader {
int action = Binary.toUnsigned(buffer.get());
long pointerId = buffer.getLong();
Position position = readPosition(buffer);
// 16 bits fixed-point
int pressureInt = Binary.toUnsigned(buffer.getShort());
// convert it to a float between 0 and 1 (0x1p16f is 2^16 as float)
float pressure = pressureInt == 0xffff ? 1f : (pressureInt / 0x1p16f);
float pressure = Binary.u16FixedPointToFloat(buffer.getShort());
int buttons = buffer.getInt();
return ControlMessage.createInjectTouchEvent(action, pointerId, position, pressure, buttons);
}