Re: [Qemu-devel] [RFC PATCH 11/15] input: mouse: add graphic_rotate support

[John Baboval <baboval@spineless.org>]

I'm not sure this is correct. Generally when the display gets rotated, 
the input device coordinates do not, and the in-guest code handles the math.

On 11/28/2013 09:30 AM, Gerd Hoffmann wrote:
> Transform absolute mouse events according to graphic_rotate.
>
> Legacy input code does it for both absolute and relative events,
> but the logic is broken for relative coordinates, so this is
> most likely not used anyway.
>
> Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
> ---
>   ui/input.c | 33 +++++++++++++++++++++++++++++++++
>   1 file changed, 33 insertions(+)
>
> diff --git a/ui/input.c b/ui/input.c
> index fa6d677..abfe3a3 100644
> --- a/ui/input.c
> +++ b/ui/input.c
> @@ -50,6 +50,33 @@ qemu_input_find_handler(uint32_t mask)
>       return NULL;
>   }
>   
> +static void qemu_input_transform_abs_rotate(InputEvent *evt)
> +{
> +    switch (graphic_rotate) {
> +    case 90:
> +        if (evt->abs->axis == INPUT_AXIS_X) {
> +            evt->abs->axis = INPUT_AXIS_Y;
> +        }
> +        if (evt->abs->axis == INPUT_AXIS_Y) {
> +            evt->abs->axis = INPUT_AXIS_X;
> +            evt->abs->axis = INPUT_EVENT_ABS_SIZE - 1 - evt->abs->axis;
> +        }
> +        break;
> +    case 180:
> +        evt->abs->axis = INPUT_EVENT_ABS_SIZE - 1 - evt->abs->axis;
> +        break;
> +    case 270:
> +        if (evt->abs->axis == INPUT_AXIS_X) {
> +            evt->abs->axis = INPUT_AXIS_Y;
> +            evt->abs->axis = INPUT_EVENT_ABS_SIZE - 1 - evt->abs->axis;
> +        }
> +        if (evt->abs->axis == INPUT_AXIS_Y) {
> +            evt->abs->axis = INPUT_AXIS_X;
> +        }
> +        break;
> +    }
> +}
> +
>   void qemu_input_event_send(QemuConsole *src, InputEvent *evt)
>   {
>       QemuInputHandlerState *s;
> @@ -58,6 +85,12 @@ void qemu_input_event_send(QemuConsole *src, InputEvent *evt)
>           return;
>       }
>   
> +    /* pre processing */
> +    if (graphic_rotate && (evt->kind == INPUT_EVENT_KIND_ABS)) {
> +            qemu_input_transform_abs_rotate(evt);
> +    }
> +
> +    /* send event */
>       s = qemu_input_find_handler(1 << evt->kind);
>       s->handler->event(s->dev, src, evt);
>       s->events++;