PPAPI: implement GetSupportedPreviewSizes

content/renderer/pepper/pepper_image_capture_host.h

+// Copyright 2015 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 CONTENT_RENDERER_PEPPER_PEPPER_IMAGE_CAPTURE_HOST_H_
+#define CONTENT_RENDERER_PEPPER_PEPPER_IMAGE_CAPTURE_HOST_H_
+
+#include "base/memory/scoped_ptr.h"
+#include "content/public/renderer/renderer_ppapi_host.h"
+#include "content/renderer/pepper/ppb_buffer_impl.h"
+#include "ppapi/c/pp_size.h"
+#include "ppapi/host/host_message_context.h"
+#include "ppapi/host/resource_host.h"
+
+namespace content {
+class PepperPlatformImageCapture;
+class RendererPpapiHostImpl;
+
+class PepperImageCaptureHost : public ppapi::host::ResourceHost {
+ public:
+  PepperImageCaptureHost(RendererPpapiHostImpl* host,
+                         PP_Instance instance,
+                         PP_Resource resource);
+
+  ~PepperImageCaptureHost() override;
+
+  bool Init();
+
+  int32_t OnResourceMessageReceived(
+      const IPC::Message& msg,
+      ppapi::host::HostMessageContext* context) override;
+
+  // These methods are called by PepperPlatformImageCapture only.
+
+  // Called when image capture is initialized.
+  void OnInitialized(bool succeeded);
+
+  // Called when the preview frame sizes are enumerated.
+  void OnPreviewSizesEnumerated(const std::vector<PP_Size>& sizes);
+
+ private:
+  // Plugin -> host message handlers.
+  int32_t OnOpen(ppapi::host::HostMessageContext* context,
+                 const std::string& device_id);
+  int32_t OnClose(ppapi::host::HostMessageContext* context);
+  int32_t OnGetSupportedPreviewSizes(ppapi::host::HostMessageContext* context);
+
+  // Utility methods.
+  void DetachPlatformImageCapture();
+
+  scoped_ptr<PepperPlatformImageCapture> platform_image_capture_;
+
+  RendererPpapiHostImpl* renderer_ppapi_host_;
+
+  ppapi::host::ReplyMessageContext open_reply_context_;
+
+  ppapi::host::ReplyMessageContext preview_sizes_reply_context_;
+
+  DISALLOW_COPY_AND_ASSIGN(PepperImageCaptureHost);
+};
+
+}  // namespace content
+
+#endif  // CONTENT_RENDERER_PEPPER_PEPPER_IMAGE_CAPTURE_HOST_H_