[Experimental] Supporting OOPIF printing

services/pdf_compositor/public/cpp/pdf_compositor_client.h

+// Copyright 2017 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 SERVICES_PDF_COMPOSITOR_PUBLIC_CPP_PDF_COMPOSITE_CLIENT_H_
+#define SERVICES_PDF_COMPOSITOR_PUBLIC_CPP_PDF_COMPOSITE_CLIENT_H_
+
+#include <stdint.h>
+
+#include <vector>
+
+#include "base/memory/shared_memory_handle.h"
+#include "services/pdf_compositor/public/interfaces/pdf_compositor.mojom.h"
+#include "services/service_manager/public/cpp/connector.h"
+
+namespace pdf_compositor {
+
+// Helper class to composite a pdf via the pdf_compositor service.
+class PdfCompositorClient {
+ public:
+  PdfCompositorClient() : compositor_(nullptr) {}
+  ~PdfCompositorClient(){};
+
+  // Connect to the service before use.
+  void ConnectionWithPdfCompositor();
+
+  // Disconnect from the service when no longer in use.
+  void DisconnectFromPdfCompositor();
+
+  // Composite the final picture and convert into a PDF file.
+  void Composite(
+      base::SharedMemoryHandle handle,
+      uint32_t data_size,
+      const pdf_compositor::mojom::PdfCompositor::CompositePdfCallback&
+          callback,
+      scoped_refptr<base::SequencedTaskRunner> callback_task_runner);
+
+  // Instructs the compositor about starting a subframe drawing for a page.
+  void PrepareSubframe(int id, int page_num);
+
+  // Check whether it is ready to start compositing a page.
+  void IsReadyToComposite(
+      int page_num,
+      const pdf_compositor::mojom::PdfCompositor::IsReadyToCompositeCallback&
+          callback,
+      scoped_refptr<base::SequencedTaskRunner> callback_task_runner);
+
+  void AddSubFrameContent(int id,
+                          base::SharedMemoryHandle handle,
+                          uint32_t data_size);
+
+ private:
+  mojom::PdfCompositorPtr compositor_;
+
+  DISALLOW_COPY_AND_ASSIGN(PdfCompositorClient);
+};
+
+}  // namespace pdf_compositor
+
+#endif  // SERVICES_PDF_COMPOSITOR_PUBLIC_CPP_PDF_COMPOSITE_CLIENT_H_