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c06d825c53
This simply doesn't work for low-dpi mice. Normalizing a 400dpi mouse to a 1000dpi mouse forces a minimum movement of 2.5 units and the resulting pixel jumps. It is impossible for the caller to detect whether the jump was caused by a single motion or multiple motion events. This is technically an API break, but not really. The accelerated data was already relatively meaningless, even if normalized as the data did not correspond predictably to any input motion (unless you know the implementation acceleration function in the caller). So we can drop the mention from there without expecting any ill effects in the caller. The unaccelerated data was useless for low-dpi mice and could only be used to measure the physical distance of the mouse movement - something not used in any caller we're aware of (if needed, we can add that functionality as a separate call). Dropping motion normalization for unaccelerated deltas also restores true dpi capabilities to users of that API, mostly games that want to make use of high-dpi mice. This is a simplified patch, the normalization is still in place for most of libinput, it merely carries the original coordinates in the event itself. In the case of touchpads, the coordinates are unnormalized into the x-axis coordinate space as per the documentation. Signed-off-by: Peter Hutterer <peter.hutterer@who-t.net> Reviewed-by: Hans de Goede <hdegoede@redhat.com> |
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/*!@mainpage libinput ======== libinput is a library that handles input devices for display servers and other applications that need to directly deal with input devices. It provides device detection, device handling, input device event processing and abstraction so minimize the amount of custom input code the user of libinput need to provide the common set of functionality that users expect. Input event processing includes scaling touch coordinates, generating pointer events from touchpads, pointer acceleration, etc. libinput originates from [weston](http://cgit.freedesktop.org/wayland/weston/), the Wayland reference compositor. Architecture ------------ libinput is not used directly by applications, rather it is used by the xf86-input-libinput X.Org driver or wayland compositors. The typical software stack for a system running Wayland is: @dotfile libinput-stack-wayland.gv Where the Wayland compositor may be Weston, mutter, KWin, etc. Note that Wayland encourages the use of toolkits, so the Wayland client (your application) does not usually talk directly to the compositor but rather employs a toolkit (e.g. GTK) to do so. The simplified software stack for a system running X.Org is: @dotfile libinput-stack-xorg.gv Again, on a modern system the application does not usually talk directly to the X server using Xlib but rather employs a toolkit to do so. Source code ----------- The source code of libinput can be found at: http://cgit.freedesktop.org/wayland/libinput For a list of current and past releases visit: http://www.freedesktop.org/wiki/Software/libinput/ Reporting Bugs -------------- Bugs can be filed in the libinput component of Wayland: https://bugs.freedesktop.org/enter_bug.cgi?product=Wayland&component=libinput Where possible, please provide an [evemu](http://www.freedesktop.org/wiki/Evemu/) recording of the input device and/or the event sequence in question. Documentation ------------- Developer API documentation: http://wayland.freedesktop.org/libinput/doc/latest/modules.html High-level documentation about libinput's features: http://wayland.freedesktop.org/libinput/doc/latest/pages.html License ------- libinput is licensed under the MIT license. > Permission is hereby granted, free of charge, to any person obtaining a > copy of this software and associated documentation files (the "Software"), > to deal in the Software without restriction, including without limitation > the rights to use, copy, modify, merge, publish, distribute, sublicense, > and/or sell copies of the Software, and to permit persons to whom the > Software is furnished to do so, subject to the following conditions: [...] See the [COPYING](http://cgit.freedesktop.org/wayland/libinput/tree/COPYING) file for the full license information. */