inputs: add spice_inputs_key_press_and_release()

If the server is capable of SPICE_INPUTS_CAP_SCANCODE, then we send
can send a single message with key press and release, to avoid
unwanted guest side key repeatition due to network jitter.

If the server is not capable, spice-gtk will use some compatibility
mode and send the existing DOWN and UP key events seperately.

4 files changed, 40 insertions, 0 deletions

diff --git a/doc/reference/spice-gtk-sections.txt b/doc/reference/spice-gtk-sections.txt
index daf575c..60e287a 100644
--- a/doc/reference/spice-gtk-sections.txt
+++ b/doc/reference/spice-gtk-sections.txt
@@ -203,6 +203,7 @@ spice_inputs_position
 spice_inputs_button_press
 spice_inputs_button_release
 spice_inputs_key_press
+spice_inputs_key_press_and_release
 spice_inputs_key_release
 spice_inputs_set_key_locks
 <SUBSECTION Standard>
diff --git a/gtk/channel-inputs.c b/gtk/channel-inputs.c
index 3259da8..0526738 100644
--- a/gtk/channel-inputs.c
+++ b/gtk/channel-inputs.c
@@ -514,6 +514,43 @@ void spice_inputs_key_release(SpiceInputsChannel *channel, guint scancode)
     spice_msg_out_send(msg);
 }
 
+/**
+ * spice_inputs_key_press_and_release:
+ * @channel:
+ * @scancode: a PC AT key scancode
+ *
+ * Press and release a key event atomically (in the same message).
+ *
+ * Since: 0.13
+ **/
+void spice_inputs_key_press_and_release(SpiceInputsChannel *input_channel, guint scancode)
+{
+    SpiceChannel *channel = SPICE_CHANNEL(input_channel);
+
+    g_return_if_fail(channel != NULL);
+    g_return_if_fail(channel->priv->state != SPICE_CHANNEL_STATE_UNCONNECTED);
+
+    if (channel->priv->state != SPICE_CHANNEL_STATE_READY)
+        return;
+    if (spice_channel_get_read_only(channel))
+        return;
+
+    if (spice_channel_test_capability(channel, SPICE_INPUTS_CAP_KEY_SCANCODE)) {
+        SpiceMsgOut *msg;
+        guint16 *code;
+
+        msg = spice_msg_out_new(channel, SPICE_MSGC_INPUTS_KEY_SCANCODE);
+        code = (guint16*)spice_marshaller_reserve_space(msg->marshaller, 2 * sizeof(guint16));
+        *code++ = spice_make_scancode(scancode, FALSE);
+        *code = spice_make_scancode(scancode, TRUE);
+        spice_msg_out_send(msg);
+    } else {
+        SPICE_DEBUG("The server doesn't support atomic press and release");
+        spice_inputs_key_press(input_channel, scancode);
+        spice_inputs_key_release(input_channel, scancode);
+    }
+}
+
 /* main or coroutine context */
 static SpiceMsgOut* set_key_locks(SpiceInputsChannel *channel, guint locks)
 {
diff --git a/gtk/channel-inputs.h b/gtk/channel-inputs.h
index 9968b3b..3179a76 100644
--- a/gtk/channel-inputs.h
+++ b/gtk/channel-inputs.h
@@ -82,6 +82,7 @@ void spice_inputs_button_release(SpiceInputsChannel *channel, gint button,
 void spice_inputs_key_press(SpiceInputsChannel *channel, guint scancode);
 void spice_inputs_key_release(SpiceInputsChannel *channel, guint scancode);
 void spice_inputs_set_key_locks(SpiceInputsChannel *channel, guint locks);
+void spice_inputs_key_press_and_release(SpiceInputsChannel *channel, guint scancode);
 
 G_END_DECLS
 
diff --git a/gtk/map-file b/gtk/map-file
index 0d48bb3..ed2c07f 100644
--- a/gtk/map-file
+++ b/gtk/map-file
@@ -46,6 +46,7 @@ spice_inputs_button_press;
 spice_inputs_button_release;
 spice_inputs_channel_get_type;
 spice_inputs_key_press;
+spice_inputs_key_press_and_release;
 spice_inputs_key_release;
 spice_inputs_lock_get_type;
 spice_inputs_motion;