[Qemu-devel] [RFC PATCH 04/15] input: add core bits of the new input layer

[Gerd Hoffmann <kraxel@redhat.com>]

Register and unregister handlers.
Event dispatcher code.

Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
---
 include/ui/input.h | 32 +++++++++++++++++++++
 ui/Makefile.objs   |  2 +-
 ui/input.c         | 83 ++++++++++++++++++++++++++++++++++++++++++++++++++++++
 3 files changed, 116 insertions(+), 1 deletion(-)
 create mode 100644 include/ui/input.h
 create mode 100644 ui/input.c

diff --git a/include/ui/input.h b/include/ui/input.h
new file mode 100644
index 0000000..3cf3641
--- /dev/null
+++ b/include/ui/input.h
@@ -0,0 +1,32 @@
+#ifndef INPUT_H
+#define INPUT_H
+
+#include "qapi-types.h"
+
+#define INPUT_EVENT_MASK_KEY   (1<<INPUT_EVENT_KIND_KEY)
+#define INPUT_EVENT_MASK_BTN   (1<<INPUT_EVENT_KIND_BTN)
+#define INPUT_EVENT_MASK_REL   (1<<INPUT_EVENT_KIND_REL)
+#define INPUT_EVENT_MASK_ABS   (1<<INPUT_EVENT_KIND_ABS)
+
+typedef struct QemuInputHandler QemuInputHandler;
+typedef struct QemuInputHandlerState QemuInputHandlerState;
+
+typedef void (*QemuInputHandlerEvent)(DeviceState *dev, QemuConsole *src,
+                                      InputEvent *evt);
+typedef void (*QemuInputHandlerSync)(DeviceState *dev);
+
+struct QemuInputHandler {
+    const char             *name;
+    uint32_t               mask;
+    QemuInputHandlerEvent  event;
+    QemuInputHandlerSync   sync;
+};
+
+QemuInputHandlerState *qemu_input_handler_register(DeviceState *dev,
+                                                   QemuInputHandler *handler);
+void qemu_input_handler_activate(QemuInputHandlerState *s);
+void qemu_input_handler_unregister(QemuInputHandlerState *s);
+void qemu_input_event_send(QemuConsole *src, InputEvent *evt);
+void qemu_input_event_sync(void);
+
+#endif /* INPUT_H */
diff --git a/ui/Makefile.objs b/ui/Makefile.objs
index 39ceadc..27af551 100644
--- a/ui/Makefile.objs
+++ b/ui/Makefile.objs
@@ -7,7 +7,7 @@ vnc-obj-$(CONFIG_VNC_SASL) += vnc-auth-sasl.o
 vnc-obj-$(CONFIG_VNC_WS) += vnc-ws.o
 vnc-obj-y += vnc-jobs.o
 
-common-obj-y += keymaps.o console.o cursor.o input-legacy.o qemu-pixman.o
+common-obj-y += keymaps.o console.o cursor.o input.o input-legacy.o qemu-pixman.o
 common-obj-$(CONFIG_SPICE) += spice-core.o spice-input.o spice-display.o
 common-obj-$(CONFIG_SDL) += sdl.o sdl_zoom.o x_keymap.o
 common-obj-$(CONFIG_COCOA) += cocoa.o
diff --git a/ui/input.c b/ui/input.c
new file mode 100644
index 0000000..23c84f7
--- /dev/null
+++ b/ui/input.c
@@ -0,0 +1,83 @@
+#include "sysemu/sysemu.h"
+#include "qapi-types.h"
+#include "ui/input.h"
+
+struct QemuInputHandlerState {
+    DeviceState       *dev;
+    QemuInputHandler  *handler;
+    int               id;
+    int               events;
+    QTAILQ_ENTRY(QemuInputHandlerState) node;
+};
+static QTAILQ_HEAD(, QemuInputHandlerState) handlers =
+    QTAILQ_HEAD_INITIALIZER(handlers);
+
+QemuInputHandlerState *qemu_input_handler_register(DeviceState *dev,
+                                                   QemuInputHandler *handler)
+{
+    QemuInputHandlerState *s = g_new0(QemuInputHandlerState, 1);
+    static int id = 1;
+
+    s->dev = dev;
+    s->handler = handler;
+    s->id = id++;
+    QTAILQ_INSERT_TAIL(&handlers, s, node);
+    return s;
+}
+
+void qemu_input_handler_activate(QemuInputHandlerState *s)
+{
+    QTAILQ_REMOVE(&handlers, s, node);
+    QTAILQ_INSERT_HEAD(&handlers, s, node);
+}
+
+void qemu_input_handler_unregister(QemuInputHandlerState *s)
+{
+    QTAILQ_REMOVE(&handlers, s, node);
+    g_free(s);
+}
+
+static QemuInputHandlerState*
+qemu_input_find_handler(uint32_t mask)
+{
+    QemuInputHandlerState *s;
+
+    QTAILQ_FOREACH(s, &handlers, node) {
+        if (mask & s->handler->mask) {
+            return s;
+        }
+    }
+    return NULL;
+}
+
+void qemu_input_event_send(QemuConsole *src, InputEvent *evt)
+{
+    QemuInputHandlerState *s;
+
+    if (!runstate_is_running() && !runstate_check(RUN_STATE_SUSPENDED)) {
+        return;
+    }
+
+    s = qemu_input_find_handler(1 << evt->kind);
+    s->handler->event(s->dev, src, evt);
+    s->events++;
+}
+
+void qemu_input_event_sync(void)
+{
+    QemuInputHandlerState *s;
+
+    if (!runstate_is_running() && !runstate_check(RUN_STATE_SUSPENDED)) {
+        return;
+    }
+
+    QTAILQ_FOREACH(s, &handlers, node) {
+        if (!s->events) {
+            continue;
+        }
+        if (s->handler->sync) {
+            s->handler->sync(s->dev);
+        }
+        s->events = 0;
+    }
+}
-- 
1.8.3.1