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Code Issues Activity Actions

Respect the overflow bit in PS/2 mouse data.

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This commit is contained in:
Andreas Kling 2019-01-17 02:32:40 +01:00
parent dc20f00872
commit d793323254
1 changed files with 3 additions and 3 deletions
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6
WindowServer/WSEventLoop.cpp
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@ -119,13 +119,13 @@ void WSEventLoop::drain_mouse()
int dx = 0; int dx = 0;
int dy = 0; int dy = 0;
while (mouse.can_read(*m_server_process)) { while (mouse.can_read(*m_server_process)) {
signed_byte data[3]; byte data[3];
ssize_t nread = mouse.read(*m_server_process, (byte*)data, sizeof(data)); ssize_t nread = mouse.read(*m_server_process, (byte*)data, sizeof(data));
ASSERT(nread == sizeof(data)); ASSERT(nread == sizeof(data));
bool left_button = data[0] & 1; bool left_button = data[0] & 1;
bool right_button = data[0] & 2; bool right_button = data[0] & 2;
dx += data[1]; dx += data[1] ? (int)data[1] - (int)((data[0] << 4) & 0x100) : 0;
dy += -data[2]; dy += data[2] ? (int)((data[0] << 3) & 0x100) - (int)data[2] : 0;
if (left_button != prev_left_button || right_button != prev_right_button || !mouse.can_read(*m_server_process)) { if (left_button != prev_left_button || right_button != prev_right_button || !mouse.can_read(*m_server_process)) {
prev_left_button = left_button; prev_left_button = left_button;
prev_right_button = right_button; prev_right_button = right_button;