[Bug 18517] Tablet pen pressure or eraser (wacom tablet) are not working in Photoshop CS 4/5

[wine-bugs at winehq.org]

http://bugs.winehq.org/show_bug.cgi?id=18517

--- Comment #51 from phaethon <eriks00 at moon.lv> ---
There are some issues with threading beyond my understanding. I believe key
caching issue is from the same story. If somebody could properly fix key
caching, it might help understand/resolve some of the tablet issues.

Photoshop uses several threads. Sometimes just one thread works and asks for
GetAsyncKeyState. Sometimes two threads ask. In the latter case weird problems
happen.

Photoshop combines info from GetAsyncKeySate, tablet events, mouse events.
Apparently on wine they are sort of out of sync compared to Photoshop
expectations. I could use a debug log similar to wine's, but recorded on
Windows with the sequence of mouse/tablet/keyboard/window messages sent,
GetAsyncKeyState, wintab WT... function calls and responses, thread ids for all
calls.

On CS6 performance. For my setup it heavily helps if I switch on GPU support to
Normal level, but switch OFF "use graphic processor for computations...". Then
I can draw circles. If latter setting is on I cannot. I have 2 more issues on
CS6 - pen drawing does not work with tablet (it sort of looses the track),
various screen update issues when I draw with tablet. CS4 for me works much
better.

If you are interested to try commenting out WT_messages then in
dlls/wintab32/wintab32.c function TABLET_WindowProc comment out call to
TABLET_PostTabletMessage in WT_PACKET case statement. For me it did not make a
difference for CS6.

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