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According to the documentation of Android's MotionEvent, the getPressure() may return values higher than 1 on some devices. To prevent passing such values into SDL they are now corrected to 1 in Java before the JNI call (where it is assumed to be correct). Currently SDL only sends SDL_FINGERMOTION events if the touch state (position or pressure) changed. By correcting pressure down to 1 some events may get dropped in the rare case that only the pressure was changed but was out of range and the position did not change.
Simple DirectMedia Layer
(SDL)
Version 2.0
---
http://www.libsdl.org/
Simple DirectMedia Layer is a cross-platform development library designed
to provide low level access to audio, keyboard, mouse, joystick, and graphics
hardware via OpenGL and Direct3D. It is used by video playback software,
emulators, and popular games including Valve's award winning catalog
and many Humble Bundle games.
More extensive documentation is available in the docs directory, starting
with README.md
Enjoy!
Sam Lantinga (slouken@libsdl.org)