Pepper: Add a function to PPB_Flash to check if a rect is topmost.

ppapi/examples/flash_topmost/flash_topmost.cc

Index: ppapi/examples/flash_topmost/flash_topmost.cc
diff --git a/ppapi/examples/flash_topmost/flash_topmost.cc b/ppapi/examples/flash_topmost/flash_topmost.cc
new file mode 100644
index 0000000000000000000000000000000000000000..fe17092e8b7a9c6e968d8d90362c378bb825fe7d
--- /dev/null
+++ b/ppapi/examples/flash_topmost/flash_topmost.cc
@@ -0,0 +1,135 @@
+// Copyright (c) 2012 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.
+
+#include "ppapi/cpp/graphics_2d.h"
+#include "ppapi/cpp/image_data.h"
+#include "ppapi/cpp/instance.h"
+#include "ppapi/cpp/logging.h"
+#include "ppapi/cpp/module.h"
+#include "ppapi/cpp/private/flash.h"
+#include "ppapi/cpp/rect.h"
+#include "ppapi/cpp/size.h"
+#include "ppapi/utility/completion_callback_factory.h"
+
+const int32_t kTimerInterval = 200;
+
+class MyInstance : public pp::Instance {
+ public:
+  explicit MyInstance(PP_Instance instance)
+      : pp::Instance(instance),
+        callback_factory_(this),
+        pending_paint_(false),
+        waiting_for_flush_completion_(false) {
+  }
+  virtual ~MyInstance() {
+  }
+
+  virtual bool Init(uint32_t argc, const char* argn[], const char* argv[]) {
+    ScheduleNextTimer();
+    return true;
+  }
+
+  virtual void DidChangeView(const pp::Rect& position, const pp::Rect& clip) {
+    if (position.size() != size_) {
+      size_ = position.size();
+      device_context_ = pp::Graphics2D(this, size_, false);
+      if (!BindGraphics(device_context_))
+        return;
+    }
+
+    Paint();
+  }
+
+ private:
+  void ScheduleNextTimer() {
+    pp::Module::Get()->core()->CallOnMainThread(
+        kTimerInterval,
+        callback_factory_.NewRequiredCallback(&MyInstance::OnTimer),
+        0);
+  }
+
+  void OnTimer(int32_t) {
+    ScheduleNextTimer();
+    Paint();
+  }
+
+  void DidFlush(int32_t result) {
+    waiting_for_flush_completion_ = false;
+    if (pending_paint_)
+      Paint();
+  }
+
+  void Paint() {
+    if (waiting_for_flush_completion_) {
+      pending_paint_ = true;
+      return;
+    }
+
+    pending_paint_ = false;
+
+    if (size_.IsEmpty())
+      return;  // Nothing to do.
+
+    pp::ImageData image = PaintImage(size_);
+    if (!image.is_null()) {
+      device_context_.ReplaceContents(&image);
+      waiting_for_flush_completion_ = true;
+      device_context_.Flush(
+          callback_factory_.NewRequiredCallback(&MyInstance::DidFlush));
+    }
+  }
+
+  pp::ImageData PaintImage(const pp::Size& size) {
+    pp::ImageData image(this, PP_IMAGEDATAFORMAT_BGRA_PREMUL, size, false);
+    if (image.is_null())
+      return image;
+
+    pp::Rect rect(size.width() / 8, size.height() / 4,
+                  3 * size.width() / 4, size.height() / 2);
+    uint32_t fill_color = pp::flash::Flash::IsRectTopmost(this, rect) ?
+        0xff00ff00 : 0xffff0000;
+
+    for (int y = 0; y < size.height(); y++) {
+      for (int x = 0; x < size.width(); x++)
+        *image.GetAddr32(pp::Point(x, y)) = fill_color;
+    }
+
+    for (int x = rect.x(); x < rect.x() + rect.width(); x++) {
+      *image.GetAddr32(pp::Point(x, rect.y())) = 0xff202020;
+      *image.GetAddr32(pp::Point(x, rect.y() + rect.height() - 1)) = 0xff202020;
+    }
+    for (int y = rect.y(); y < rect.y() + rect.height(); y++) {
+      *image.GetAddr32(pp::Point(rect.x(), y)) = 0xff202020;
+      *image.GetAddr32(pp::Point(rect.x() + rect.width() - 1, y)) = 0xff202020;
+    }
+
+    return image;
+  }
+
+  pp::CompletionCallbackFactory<MyInstance> callback_factory_;
+
+  int32_t timer_interval_;
+
+  // Painting stuff.
+  pp::Size size_;
+  pp::Graphics2D device_context_;
+  bool pending_paint_;
+  bool waiting_for_flush_completion_;
+};
+
+class MyModule : public pp::Module {
+ public:
+  virtual pp::Instance* CreateInstance(PP_Instance instance) {
+    return new MyInstance(instance);
+  }
+};
+
+namespace pp {
+
+// Factory function for your specialization of the Module object.
+Module* CreateModule() {
+  return new MyModule();
+}
+
+}  // namespace pp