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b0f9d2f713
One of the major issues with the old tracking code is a data race between the cursor thread updating g_cursor.guest and the app_handleMouseBasic function. Specifically, the latter may have sent mouse input via spice that has not been processed by the guest and updated g_cursor.guest, but the guest may overwrite g_cursor.guest to a previous state before the input is processed. This causes some movements to be doubled. Eventually, the cursor positions will synchronize, but this nevertheless causes a lot of jitter. In this commit, we introduce a new field g_cursor.projected, which is unambiguously the position of the cursor after taking into account all the input already sent via spice. This is synced up to the guest cursor upon entering the window and when the host restarts. Afterwards, all mouse movements will be based on this position. This eliminates all cursor jitter as far as I could tell. Also, the cursor is now synced to the host position when exiting capture mode. A downside of this commit is that if the 1:1 movement patch is not correctly applied, the cursor position would be wildly off instead of simply jittering, but that is an unsupported configuration and should not matter. Also unsupported is when an application in guest moves the cursor programmatically and bypassing spice. When using those applications, capture mode must be on. Before this commit, we try to move the guest cursor back to where it should be, but it's inherently fragile and may lead to scenarios such as wild movements in first-person shooters. |
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