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https://gitlab.freedesktop.org/wlroots/wlroots.git
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c84cc660f0
Starting with Linux Kernel v5.0 two new axes are available for mice that support high-resolution wheel scrolling: REL_WHEEL_HI_RES and REL_HWHEEL_HI_RES. Both axes send data in fractions of 120 where each multiple of 120 amounts to one logical scroll event. Fractions of 120 indicate a wheel movement less than one detent. Three new events are now available on libinput: LIBINPUT_EVENT_POINTER_SCROLL_WHEEL, LIBINPUT_EVENT_POINTER_SCROLL_FINGER, and LIBINPUT_EVENT_POINTER_SCROLL_CONTINUOUS. These events replace the LIBINPUT_EVENT_POINTER_AXIS event, so new clients should simply ignore that event. Also, two new APIs are available to access the high-resolution data: libinput_event_pointer_get_scroll_value() and libinput_event_pointer_get_scroll_value_v120(). Add a project argument (LIBINPUT_HAS_SCROLL_VALUE120) to allow building against old versions of libinput or, where high-resolution scroll is available, support it.
35 lines
849 B
Meson
35 lines
849 B
Meson
msg = ['Required for libinput backend support.']
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if 'libinput' in backends
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msg += 'Install "libinput" or disable the libinput backend.'
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endif
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libinput = dependency(
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'libinput',
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version: '>=1.14.0',
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required: 'libinput' in backends,
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not_found_message: '\n'.join(msg),
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)
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if not libinput.found()
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subdir_done()
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endif
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wlr_files += files(
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'backend.c',
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'events.c',
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'keyboard.c',
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'pointer.c',
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'switch.c',
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'tablet_pad.c',
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'tablet_tool.c',
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'touch.c',
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)
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features += { 'libinput-backend': true }
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wlr_deps += libinput
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# libinput hold gestures and high resolution scroll are available since 1.19.0
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add_project_arguments([
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'-DLIBINPUT_HAS_HOLD_GESTURES=@0@'.format(libinput.version().version_compare('>=1.19.0').to_int()),
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'-DLIBINPUT_HAS_SCROLL_VALUE120=@0@'.format(libinput.version().version_compare('>=1.19.0').to_int()),
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], language: 'c')
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