tools/pbl: add QEMU touch injection (touch/swipe)#1790
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Developing touch navigation needed a way to drive the touchscreen under QEMU
without flashing hardware, so `./pbl qemu` now exposes a QMP socket and two
new commands inject touch events into a running emulator:
./pbl touch X Y tap at a pixel coordinate
./pbl swipe X1 Y1 X2 Y2 swipe, streaming intermediate moves so drag
gestures are seen as continuous
Coordinates are in screen pixels; the display size is read from the emulated
pebble-touch device and scaled to QEMU's absolute-axis range. Injection uses
the absolute-pointer input path (input-send-event abs+btn); multi-touch is not
wired up in the device.
Document the commands in docs/development/qemu.md and the working-with-qemu
skill.
Co-authored-by: Claude Opus 4.8 <noreply@anthropic.com>
Signed-off-by: Vlad Zaytsev <git@vvzvlad.xyz>
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While developing touch navigation I needed a way to drive the touchscreen
under QEMU to iterate and test without flashing hardware, so I wrote this.
./pbl qemunow exposes a QMP socket, and two commands inject touch into arunning emulator:
Coordinates are screen pixels; the display size is read from the emulated
pebble-touch device and scaled to QEMU's absolute-axis range. Swipes stream
intermediate moves so drag gestures are seen as continuous. Injection uses the
absolute-pointer input path (input-send-event abs+btn); multi-touch is not
wired up in the device.
Also documents the workflow in the working-with-qemu skill.
Tested on qemu_gabbro:
./pbl qemucreates the QMP socket; touch and swipeland at the expected coordinates (verified against the pebble-touch device
registers).