Re: [Qemu-devel] [PATCH 9/9] spice: add tablet support

[Anthony Liguori <anthony@codemonkey.ws>]

On 08/19/2010 07:40 AM, Gerd Hoffmann wrote:
> Add support for the spice tablet interface.  The tablet interface will
> be registered (and then used by the spice client) as soon as a absolute
> pointing device is available and used by the guest, i.e. you'll have to
> configure your guest with '-usbdevice tablet'.
>
> Signed-off-by: Gerd Hoffmann<kraxel@redhat.com>
> ---
>   spice-display.c |    2 +-
>   spice-input.c   |   99 +++++++++++++++++++++++++++++++++++++++++++++++++++----
>   2 files changed, 93 insertions(+), 8 deletions(-)
>
> diff --git a/spice-display.c b/spice-display.c
> index 1e6d939..fec2432 100644
> --- a/spice-display.c
> +++ b/spice-display.c
> @@ -143,7 +143,7 @@ void qemu_spice_create_host_primary(SimpleSpiceDisplay *ssd)
>       surface.width      = ds_get_width(ssd->ds);
>       surface.height     = ds_get_height(ssd->ds);
>       surface.stride     = -surface.width * 4;
> -    surface.mouse_mode = 0;
> +    surface.mouse_mode = true;
>       surface.flags      = 0;
>       surface.type       = 0;
>       surface.mem        = (intptr_t)ssd->buf;
> diff --git a/spice-input.c b/spice-input.c
> index 8f3deb4..5646ff9 100644
> --- a/spice-input.c
> +++ b/spice-input.c
> @@ -1,5 +1,6 @@
>   #include<stdlib.h>
>   #include<stdio.h>
> +#include<stdbool.h>
>   #include<string.h>
>
>   #include<spice.h>
> @@ -48,9 +49,13 @@ static void kbd_leds(void *opaque, int ledstate)
>
>   /* mouse bits */
>
> -typedef struct QemuSpiceMouse {
> -    SpiceMouseInstance sin;
> -} QemuSpiceMouse;
> +typedef struct QemuSpicePointer {
> +    SpiceMouseInstance  mouse;
> +    SpiceTabletInstance tablet;
> +    int width, height, x, y;
> +    Notifier mouse_mode;
> +    bool absolute;
> +} QemuSpicePointer;
>
>   static void mouse_motion(SpiceMouseInstance *sin, int dx, int dy, int dz,
>                            uint32_t buttons_state)
> @@ -72,17 +77,97 @@ static const SpiceMouseInterface mouse_interface = {
>       .buttons            = mouse_buttons,
>   };
>
> +static void tablet_set_logical_size(SpiceTabletInstance* sin, int width, int height)
> +{
> +    QemuSpicePointer *pointer = container_of(sin, QemuSpicePointer, tablet);
> +
> +    fprintf(stderr, "%s: %dx%d\n", __FUNCTION__, width, height);
> +    if (height<  16)
> +        height = 16;
> +    if (width<  16)
> +        width = 16;
> +    pointer->width  = width;
> +    pointer->height = height;
> +}
> +
> +static void tablet_position(SpiceTabletInstance* sin, int x, int y,
> +                            uint32_t buttons_state)
> +{
> +    QemuSpicePointer *pointer = container_of(sin, QemuSpicePointer, tablet);
> +
> +    pointer->x = x * 0x7FFF / (pointer->width - 1);
> +    pointer->y = y * 0x7FFF / (pointer->height - 1);
> +    kbd_mouse_event(pointer->x, pointer->y, 0, buttons_state);
> +}
> +
> +
> +static void tablet_wheel(SpiceTabletInstance* sin, int wheel,
> +                         uint32_t buttons_state)
> +{
> +    QemuSpicePointer *pointer = container_of(sin, QemuSpicePointer, tablet);
> +
> +    kbd_mouse_event(pointer->x, pointer->y, wheel, buttons_state);
> +}
> +
> +static void tablet_buttons(SpiceTabletInstance *sin,
> +                           uint32_t buttons_state)
> +{
> +    QemuSpicePointer *pointer = container_of(sin, QemuSpicePointer, tablet);
> +
> +    kbd_mouse_event(pointer->x, pointer->y, 0, buttons_state);
> +}
> +
> +static const SpiceTabletInterface tablet_interface = {
> +    .base.type          = SPICE_INTERFACE_TABLET,
> +    .base.description   = "tablet",
> +    .base.major_version = SPICE_INTERFACE_TABLET_MAJOR,
> +    .base.minor_version = SPICE_INTERFACE_TABLET_MINOR,
> +    .set_logical_size   = tablet_set_logical_size,
> +    .position           = tablet_position,
> +    .wheel              = tablet_wheel,
> +    .buttons            = tablet_buttons,
> +};
> +
> +static void mouse_mode_notifier(Notifier *notifier)
> +{
> +    QemuSpicePointer *pointer = container_of(notifier, QemuSpicePointer, mouse_mode);
> +    bool is_absolute  = kbd_mouse_is_absolute();
> +    bool has_absolute = kbd_mouse_has_absolute();
> +
> +    fprintf(stderr, "%s: absolute pointer: %s%s\n", __FUNCTION__,
> +            has_absolute ? "present" : "not available",
> +            is_absolute  ? "+active" : "");
> +
> +    if (pointer->absolute == is_absolute)
> +        return;
> +
> +    if (is_absolute) {
> +        fprintf(stderr, "%s: using absolute pointer (client mode)\n", __FUNCTION__);
> +        spice_server_add_interface(spice_server,&pointer->tablet.base);
> +    } else {
> +        fprintf(stderr, "%s: using relative pointer (server mode)\n", __FUNCTION__);
> +        spice_server_remove_interface(&pointer->tablet.base);
> +    }
> +    pointer->absolute = is_absolute;
> +}
> +
>    

Minus the fprintf()s and the lack of conversion of button formats, this 
all looks pretty reasonable.

Regards,

Anthony Liguori

>   void qemu_spice_input_init(void)
>   {
>       QemuSpiceKbd *kbd;
> -    QemuSpiceMouse *mouse;
> +    QemuSpicePointer *pointer;
>
>       kbd = qemu_mallocz(sizeof(*kbd));
>       kbd->sin.base.sif =&kbd_interface.base;
>       spice_server_add_interface(spice_server,&kbd->sin.base);
>       qemu_add_led_event_handler(kbd_leds, kbd);
>
> -    mouse = qemu_mallocz(sizeof(*mouse));
> -    mouse->sin.base.sif =&mouse_interface.base;
> -    spice_server_add_interface(spice_server,&mouse->sin.base);
> +    pointer = qemu_mallocz(sizeof(*pointer));
> +    pointer->mouse.base.sif  =&mouse_interface.base;
> +    pointer->tablet.base.sif =&tablet_interface.base;
> +    spice_server_add_interface(spice_server,&pointer->mouse.base);
> +
> +    pointer->absolute = false;
> +    pointer->mouse_mode.notify = mouse_mode_notifier;
> +    qemu_add_mouse_mode_change_notifier(&pointer->mouse_mode);
> +    mouse_mode_notifier(&pointer->mouse_mode);
>   }
>