On Mon, 3 Jul 2017, Owen Smith wrote:
> If the vkbd device model is registered and the vfb device model
> is not registered, the backend will not transition to connected.
> If there is no DisplayState, then the absolute coordinates cannot
> be scaled, and will remain in the range [0, 0x7fff].
> Backend writes "feature-raw-pointer" to indicate that the backend
> supports reporting absolute position without rescaling.
> The frontend uses "request-raw-pointer" to request raw unscaled
> pointer values. If there is no DisplayState, the absolute values
> are always raw unscaled values.
>
> Signed-off-by: Owen Smith
> ---
> hw/display/xenfb.c | 36 ++--
> 1 file changed, 26 insertions(+), 10 deletions(-)
>
> diff --git a/hw/display/xenfb.c b/hw/display/xenfb.c
> index 88815df..d40af6e 100644
> --- a/hw/display/xenfb.c
> +++ b/hw/display/xenfb.c
> @@ -53,6 +53,7 @@ struct common {
> struct XenInput {
> struct common c;
> int abs_pointer_wanted; /* Whether guest supports absolute pointer */
> +int raw_pointer_wanted; /* Whether guest supports unscaled pointer */
> int button_state; /* Last seen pointer button state */
> int extended;
> /* kbd */
> @@ -329,18 +330,22 @@ static void xenfb_mouse_event(void *opaque,
> int dx, int dy, int dz, int button_state)
> {
> struct XenInput *xenfb = opaque;
> -DisplaySurface *surface = qemu_console_surface(xenfb->c.con);
> -int dw = surface_width(surface);
> -int dh = surface_height(surface);
> -int i;
> +int i, x, y;
> +if (xenfb->c.con && xenfb->raw_pointer_wanted != 1) {
> +DisplaySurface *surface = qemu_console_surface(xenfb->c.con);
> +int dw = surface_width(surface);
> +int dh = surface_height(surface);
> +x = dx * (dw - 1) / 0x7fff;
> +y = dy * (dh - 1) / 0x7fff;
> +} else {
> +x = dx;
> +y = dy;
> +}
>
> trace_xenfb_mouse_event(opaque, dx, dy, dz, button_state,
> xenfb->abs_pointer_wanted);
> if (xenfb->abs_pointer_wanted)
Shouldn't this be:
if (xenfb->abs_pointer_wanted || xenfb->raw_pointer_wanted)
?
It it possible to have raw_pointer_wanted && !abs_pointer_wanted? If
not, we should check at connection or initialization time.
> - xenfb_send_position(xenfb,
> - dx * (dw - 1) / 0x7fff,
> - dy * (dh - 1) / 0x7fff,
> - dz);
> +xenfb_send_position(xenfb, x, y, dz);
> else
> xenfb_send_motion(xenfb, dx, dy, dz);
>
> @@ -423,6 +428,7 @@ static void xenfb_legacy_mouse_sync(DeviceState *dev)
> static int input_init(struct XenDevice *xendev)
> {
> xenstore_write_be_int(xendev, "feature-abs-pointer", 1);
> +xenstore_write_be_int(xendev, "feature-raw-pointer", 1);
> return 0;
> }
>
> @@ -432,8 +438,14 @@ static int input_initialise(struct XenDevice *xendev)
> int rc;
>
> if (!in->c.con) {
> -xen_pv_printf(xendev, 1, "ds not set (yet)\n");
> -return -1;
> +char *vfb = xenstore_read_str(NULL, "device/vfb");
Isn't it better to do xenstore_read_str("device", "vfb") ?
> +if (vfb == NULL) {
> +/* there is no vfb, run vkbd on its own */
> +} else {
if (vfb != NULL)
> +free(vfb);
g_free
> +xen_pv_printf(xendev, 1, "ds not set (yet)\n");
> +return -1;
> +}
> }
>
> rc = common_bind(>c);
> @@ -451,6 +463,10 @@ static void input_connected(struct XenDevice *xendev)
> >abs_pointer_wanted) == -1) {
> in->abs_pointer_wanted = 0;
> }
> +if (xenstore_read_fe_int(xendev, "request-raw-pointer",
> + >raw_pointer_wanted) == -1) {
> +in->raw_pointer_wanted = 0;
> +}
>
> if (in->qkbd) {
> qemu_input_handler_unregister(in->qkbd);
> --
> 2.1.4
>