Re: [Qemu-devel] [PATCH 2/3] vnc: Support for LED state extension

[Anthony Liguori <aliguori@us.ibm.com>]

Lei Li <lilei@linux.vnet.ibm.com> writes:

> Signed-off-by: Lei Li <lilei@linux.vnet.ibm.com>
> ---
>  ui/vnc.c |   48 ++++++++++++++++++++++++++++++++++++++++++++++++
>  ui/vnc.h |    4 +++-
>  2 files changed, 51 insertions(+), 1 deletions(-)
>
> diff --git a/ui/vnc.c b/ui/vnc.c
> index f574962..e22cca1 100644
> --- a/ui/vnc.c
> +++ b/ui/vnc.c
> @@ -1522,6 +1522,45 @@ static void press_key(VncState *vs, int keysym)
>      kbd_put_keycode(keycode | SCANCODE_UP);
>  }
>  
> +static int current_led_state(VncState *vs)
> +{
> +    int ledstate = 0;
> +
> +    if (vs->modifiers_state[0x46]) {
> +        ledstate |= QEMU_SCROLL_LOCK_LED;
> +    }
> +    if (vs->modifiers_state[0x45]) {
> +        ledstate |= QEMU_NUM_LOCK_LED;
> +    }
> +    if (vs->modifiers_state[0x3a]) {
> +        ledstate |= QEMU_CAPS_LOCK_LED;
> +    }
> +
> +    return ledstate;
> +}
> +
> +static void vnc_led_state_change(VncState *vs)
> +{
> +    int ledstate = 0;
> +
> +    if (!vnc_has_feature(vs, VNC_FEATURE_LED_STATE)) {
> +        return;
> +    }
> +
> +    ledstate = current_led_state(vs);
> +    vnc_lock_output(vs);
> +    vnc_write_u8(vs, VNC_MSG_SERVER_FRAMEBUFFER_UPDATE);
> +    vnc_write_u8(vs, 0);
> +    vnc_write_u16(vs, 1);
> +    vnc_framebuffer_update(vs, 0, 0,
> +                           surface_width(vs->vd->ds),
> +                           surface_height(vs->vd->ds),

This can just be 1, 1.  You don't have to send the actual width/height.

Otherwise, looks pretty good.

Regards,

Anthony Liguori

> +                           VNC_ENCODING_LED_STATE);
> +    vnc_write_u8(vs, ledstate);
> +    vnc_unlock_output(vs);
> +    vnc_flush(vs);
> +}
> +
>  static void kbd_leds(void *opaque, int ledstate)
>  {
>      VncState *vs = opaque;
> @@ -1540,6 +1579,11 @@ static void kbd_leds(void *opaque, int ledstate)
>      if (vs->modifiers_state[0x46] != scr) {
>          vs->modifiers_state[0x46] = scr;
>      }
> +
> +    /* Sending the current led state message to the client */
> +    if (ledstate != current_led_state(vs)) {
> +        vnc_led_state_change(vs);
> +    }
>  }
>  
>  static void do_key_event(VncState *vs, int down, int keycode, int sym)
> @@ -1893,6 +1937,9 @@ static void set_encodings(VncState *vs, int32_t *encodings, size_t n_encodings)
>          case VNC_ENCODING_WMVi:
>              vs->features |= VNC_FEATURE_WMVI_MASK;
>              break;
> +        case VNC_ENCODING_LED_STATE:
> +            vs->features |= VNC_FEATURE_LED_STATE_MASK;
> +            break;
>          case VNC_ENCODING_COMPRESSLEVEL0 ... VNC_ENCODING_COMPRESSLEVEL0 + 9:
>              vs->tight.compression = (enc & 0x0F);
>              break;
> @@ -1908,6 +1955,7 @@ static void set_encodings(VncState *vs, int32_t *encodings, size_t n_encodings)
>      }
>      vnc_desktop_resize(vs);
>      check_pointer_type_change(&vs->mouse_mode_notifier, NULL);
> +    vnc_led_state_change(vs);
>  }
>  
>  static void set_pixel_conversion(VncState *vs)
> diff --git a/ui/vnc.h b/ui/vnc.h
> index ad1dec2..e873377 100644
> --- a/ui/vnc.h
> +++ b/ui/vnc.h
> @@ -384,6 +384,7 @@ enum {
>  #define VNC_ENCODING_EXT_KEY_EVENT        0XFFFFFEFE /* -258 */
>  #define VNC_ENCODING_AUDIO                0XFFFFFEFD /* -259 */
>  #define VNC_ENCODING_TIGHT_PNG            0xFFFFFEFC /* -260 */
> +#define VNC_ENCODING_LED_STATE            0XFFFFFEFB /* -261 */
>  #define VNC_ENCODING_WMVi                 0x574D5669
>  
>  /*****************************************************************************
> @@ -422,6 +423,7 @@ enum {
>  #define VNC_FEATURE_TIGHT_PNG                8
>  #define VNC_FEATURE_ZRLE                     9
>  #define VNC_FEATURE_ZYWRLE                  10
> +#define VNC_FEATURE_LED_STATE               11
>  
>  #define VNC_FEATURE_RESIZE_MASK              (1 << VNC_FEATURE_RESIZE)
>  #define VNC_FEATURE_HEXTILE_MASK             (1 << VNC_FEATURE_HEXTILE)
> @@ -434,7 +436,7 @@ enum {
>  #define VNC_FEATURE_TIGHT_PNG_MASK           (1 << VNC_FEATURE_TIGHT_PNG)
>  #define VNC_FEATURE_ZRLE_MASK                (1 << VNC_FEATURE_ZRLE)
>  #define VNC_FEATURE_ZYWRLE_MASK              (1 << VNC_FEATURE_ZYWRLE)
> -
> +#define VNC_FEATURE_LED_STATE_MASK           (1 << VNC_FEATURE_LED_STATE)
>  
>  /* Client -> Server message IDs */
>  #define VNC_MSG_CLIENT_SET_PIXEL_FORMAT           0
> -- 
> 1.7.7.6