82 lines
2.4 KiB
Go
82 lines
2.4 KiB
Go
package main
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import (
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"encoding/binary"
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"io"
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"net/http"
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"strconv"
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"strings"
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"g.fc.run/theater/cabletest/internal/evdev"
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)
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var touchscreen *evdev.Touchscreen
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type inputEvent struct {
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typ, code uint16
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val int32
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}
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// Events written to the node are fed into the input core as if the hardware
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// produced them, so cabletest sees a finger without carrying any injection
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// code. Timestamps are left zero: evdev stamps injected events at delivery.
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func send(t *evdev.Touchscreen, evs []inputEvent) error {
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buf := make([]byte, len(evs)*evdev.EventSize)
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for i, e := range evs {
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o := i * evdev.EventSize
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binary.NativeEndian.PutUint16(buf[o+16:], e.typ)
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binary.NativeEndian.PutUint16(buf[o+18:], e.code)
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binary.NativeEndian.PutUint32(buf[o+20:], uint32(e.val))
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}
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_, err := t.F.Write(buf)
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return err
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}
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// The page speaks portrait canvas pixels; the device speaks the panel's
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// landscape axes, so the quarter turn cabletest applies on the way in is
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// inverted on the way out.
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func touch(w http.ResponseWriter, r *http.Request) {
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body, err := io.ReadAll(r.Body)
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if err != nil {
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return
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}
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f := strings.Fields(string(body))
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if len(f) == 1 && f[0] == "up" {
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if err := send(touchscreen, []inputEvent{{evdev.Key, evdev.BtnTouch, 0}, {evdev.Syn, 0, 0}}); err != nil {
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http.Error(w, err.Error(), http.StatusInternalServerError)
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}
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return
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}
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if len(f) != 3 || (f[0] != "down" && f[0] != "move") {
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http.Error(w, "want down x y, move x y, or up", http.StatusBadRequest)
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return
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}
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cx, errX := strconv.Atoi(f[1])
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cy, errY := strconv.Atoi(f[2])
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if errX != nil || errY != nil {
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http.Error(w, "bad coordinates", http.StatusBadRequest)
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return
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}
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latestMu.RLock()
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k := latest
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latestMu.RUnlock()
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if k.buf == nil {
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http.Error(w, "no frame to locate the touch on", http.StatusServiceUnavailable)
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return
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}
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cx = min(max(cx, 0), k.ph-1)
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cy = min(max(cy, 0), k.pw-1)
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xl, yl := cy, k.ph-1-cx
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t := touchscreen
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rawX := t.MinX + int32(int64(xl)*int64(t.MaxX-t.MinX)/int64(k.pw-1))
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rawY := t.MinY + int32(int64(yl)*int64(t.MaxY-t.MinY)/int64(k.ph-1))
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evs := []inputEvent{{evdev.Abs, evdev.AbsX, rawX}, {evdev.Abs, evdev.AbsY, rawY}}
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if f[0] == "down" {
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evs = append(evs, inputEvent{evdev.Key, evdev.BtnTouch, 1})
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}
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evs = append(evs, inputEvent{evdev.Syn, 0, 0})
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if err := send(touchscreen, evs); err != nil {
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http.Error(w, err.Error(), http.StatusInternalServerError)
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}
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}
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