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Code Issues Activity Actions

WindowServer: Improve parsing of mouse packets.

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This commit is contained in:
Andreas Kling 2019-02-07 08:07:37 +01:00
parent a537d78ac0
commit e29060620f
1 changed files with 17 additions and 2 deletions
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19
WindowServer/WSMessageLoop.cpp
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@ -159,8 +159,23 @@ void WSMessageLoop::drain_mouse()
ASSERT(nread == sizeof(data));
bool left_button = data[0] & 1;
bool right_button = data[0] & 2;
dx += data[1] ? (int)data[1] - (int)((data[0] << 4) & 0x100) : 0;
dy += data[2] ? (int)((data[0] << 3) & 0x100) - (int)data[2] : 0;
bool x_overflow = data[0] & 0x40;
bool y_overflow = data[0] & 0x80;
bool x_sign = data[0] & 0x10;
bool y_sign = data[0] & 0x20;
if (x_overflow || y_overflow)
continue;
int x = data[1];
int y = data[2];
if (x && x_sign)
x -= 0x100;
if (y && y_sign)
y -= 0x100;
dx += x;
dy += -y;
if (left_button != prev_left_button || right_button != prev_right_button || !mouse.can_read(*m_server_process)) {
prev_left_button = left_button;
prev_right_button = right_button;