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Scale_to_desktop() converts ABS events from device coordinates to screen coordinates: [dev_X_min, dev_X_max] -> [screen_X_min, screen_X_max] [dev_Y_min, dev_Y_max] -> [screen_Y_min, screen_Y_max] An edge ABS event with X = dev_X_max (e.g., generated from the edge of a touchscreen) will be converted to have screen X value = screen_X_max, which, however, will be filterd out when xserver tries to find proper Window to receive the event, because the range check for a Window to receive events is window_X_min <= event_screen_X < window_X_max Events with event_screen_X = screen_X_max will fail the test get and rejected by the Window. To fix this, we change the device to screen coordinates mapping to [dev_X_min, dev_X_max] -> [screen_X_min, screen_X_max-1] [dev_Y_min, dev_Y_max] -> [screen_Y_min, screen_Y_max-1] Reviewed-by: Chase Douglas <chase.douglas@canonical.com> Reviewed-by: Jeremy Huddleston Sequoia <jeremyhu@apple.com> Signed-off-by: Yufeng Shen <miletus@chromium.org> Signed-off-by: Keith Packard <keithp@keithp.com>
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