ppapi_simple

native_client_sdk/src/libraries/ppapi_simple/ps_event.h

+// Copyright (c) 2013 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+
+#ifndef PPAPI_SIMPLE_PS_EVENT_H_
+#define PPAPI_SIMPLE_PS_EVENT_H_
+
+#include "ppapi/c/pp_bool.h"
+#include "ppapi/c/pp_resource.h"
+#include "ppapi/c/pp_var.h"
+
+#include "utils/macros.h"
+
+EXTERN_C_BEGIN
+
+/**
+ * PSEvent
+ *
+ * The PSEvent system provides an in-order event processing mechanism.
+ * As Pepper events such as input, or focus and view changes arrive on the
+ * main pepper thread, they are placed on various FIFOs based on event type.
+ * For any given event type, only a single thread will process those events.
+ *
+ * By default, the "EventThread" will receive all messages.  However any thread
+ * can call PSRequestEventsType to request that all new events of that type
+ * are placed on that particular thread's queue.
+ *
+ * This allows the developer to choose which threads handle which event types
+ * while keeping all events belonging to a particular thread in order.  This
+ * is useful, for example, in the case of graphics to synchronize the size
+ * of the graphics context, with mouse clicks to correctly interpret location.
+ */
+
+
+typedef enum {
+  /* Mask off all events. */
+  PSE_NONE = 0,
+
+  /* From HandleInputEvent, conatins an input resource. */
+  PSE_INSTANCE_HANDLEINPUT = 1,
+
+  /* From HandleMessage, contains a PP_Var. */
+  PSE_INSTANCE_HANDLEMESSAGE = 2,
+
+  /* From DidChangeView, contains a view resource */
+  PSE_INSTANCE_DIDCHANGEVIEW = 4,
+
+  /* From DidChangeFocus, contains a PP_Bool with the current focus state. */
+  PSE_INSTANCE_DIDCHANGEFOCUS = 8,
+
+  /* When the 3D context is lost, no resource. */
+  PSE_GRAPHICS3D_GRAPHICS3DCONTEXTLOST = 16,
+
+  /* When the mouse lock is lost. */
+  PSE_MOUSELOCK_MOUSELOCKLOST = 32,
+
+  /* Enable all events. */
+  PSE_ALL = -1,
+} PSEventType;
+
+typedef uint32_t PSEventTypeMask;
+
+// Generic Event
+typedef struct {
+  PSEventType type;
+  union {
+    PP_Bool as_bool;
+    PP_Resource as_resource;
+    struct PP_Var as_var;
+  };
+} PSEvent;
+
+
+/**
+ * Function for queuing, acquiring, and releasing events.
+ */
+PSEvent* PSEventTryAcquire();
+PSEvent* PSEventWaitAcquire();
+void PSEventRelease(PSEvent* event);
+void PSEventSetFilter(PSEventTypeMask mask);
+
+/**
+ * Creates and adds an event of the specified type to the event queue if
+ * that event type is not currently filtered.
+ */
+void PSEventPost(PSEventType type);
+void PSEventPostBool(PSEventType type, PP_Bool state);
+void PSEventPostVar(PSEventType type, struct PP_Var var);
+void PSEventPostResource(PSEventType type, PP_Resource resource);
+
+EXTERN_C_END
+
+#endif  // PPAPI_SIMPLE_PS_EVENT_H_
+