Pepper: add Image Capture interfaces.

API proposal:
https://docs.google.com/a/chromium.org/document/d/1deeCrsvT9xA77UP4yWMhqbHgS3FvYCTF_8meIMQRrDo/edit#

BUG=387547
TEST=Build chrome, run PPAPITest, and run an app that uses ppapi.

Review URL: https://codereview.chromium.org/391323002

Cr-Commit-Position: refs/heads/master@{#290186}
git-svn-id: svn://svn.chromium.org/chrome/trunk/src@290186 0039d316-1c4b-4281-b951-d872f2087c98

3 files changed, 361 insertions, 0 deletions

diff --git a/ppapi/cpp/private/camera_capabilities_private.h b/ppapi/cpp/private/camera_capabilities_private.h
new file mode 100644
index 0000000..5151c75
--- /dev/null
+++ b/ppapi/cpp/private/camera_capabilities_private.h
@@ -0,0 +1,83 @@
+/* Copyright 2014 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_CPP_PRIVATE_CAMERA_CAPABILITIES_PRIVATE_H_
+#define PPAPI_CPP_PRIVATE_CAMERA_CAPABILITIES_PRIVATE_H_
+
+#include "ppapi/c/private/ppb_camera_capabilities_private.h"
+#include "ppapi/cpp/resource.h"
+#include "ppapi/cpp/size.h"
+
+/// @file
+/// This file defines the CameraCapabilities_Private interface for
+/// establishing an image capture configuration resource within the browser.
+namespace pp {
+
+/// The <code>CameraCapabilities_Private</code> interface contains methods for
+/// getting the image capture capabilities within the browser.
+class CameraCapabilities_Private : public Resource {
+ public:
+  /// Default constructor for creating an is_null()
+  /// <code>CameraCapabilities_Private</code> object.
+  CameraCapabilities_Private();
+
+  /// The copy constructor for <code>CameraCapabilities_Private</code>.
+  ///
+  /// @param[in] other A reference to a <code>CameraCapabilities_Private
+  /// </code>.
+  CameraCapabilities_Private(const CameraCapabilities_Private& other);
+
+  /// Constructs a <code>CameraCapabilities_Private</code> from a <code>
+  /// Resource</code>.
+  ///
+  /// @param[in] resource A <code>PPB_CameraCapabilities_Private</code>
+  /// resource.
+  explicit CameraCapabilities_Private(const Resource& resource);
+
+  /// Constructs a <code>CameraCapabilities_Private</code> object.
+  ///
+  /// @param[in] instance The instance with which this resource will be
+  /// associated.
+  explicit CameraCapabilities_Private(const InstanceHandle& instance);
+
+  /// A constructor used when you have received a <code>PP_Resource</code> as a
+  /// return value that has had 1 ref added for you.
+  ///
+  /// @param[in] resource A <code>PPB_CameraCapabilities_Private</code>
+  /// resource.
+  CameraCapabilities_Private(PassRef, PP_Resource resource);
+
+  // Destructor.
+  ~CameraCapabilities_Private();
+
+  /// GetSupportedPreviewSizes() returns the supported preview sizes for the
+  /// given <code>CameraCapabilities_Private</code>.
+  ///
+  /// @param[out] A vector of <code>Size</code> corresponding to the
+  /// supported preview sizes in pixels.
+  void GetSupportedPreviewSizes(std::vector<Size>* preview_sizes);
+
+  /// GetSupportedJpegSize() returns the supported JPEG sizes for the given
+  /// <code>CameraCapabilities_Private</code>.
+  ///
+  /// @param[out] A vector of <code>Size</code> corresponding to the
+  /// supported JPEG image sizes in pixels.
+  void GetSupportedJpegSizes(std::vector<Size>* jpeg_sizes);
+
+  /// IsCameraCapabilities() determines if the given resource is a
+  /// <code>CameraCapabilities_Private</code>.
+  ///
+  /// @param[in] resource A <code>Resource</code> corresponding to an image
+  /// capture capabilities resource.
+  ///
+  /// @return true if the given resource is an <code>
+  /// CameraCapabilities_Private</code> resource, otherwise false.
+  static bool IsCameraCapabilities(const Resource& resource);
+};
+
+}  // namespace pp
+
+#endif  /* PPAPI_CPP_PRIVATE_CAMERA_CAPABILITIES_PRIVATE_H_ */
+
diff --git a/ppapi/cpp/private/image_capture_config_private.h b/ppapi/cpp/private/image_capture_config_private.h
new file mode 100644
index 0000000..a4847fb3
--- /dev/null
+++ b/ppapi/cpp/private/image_capture_config_private.h
@@ -0,0 +1,99 @@
+/* Copyright 2014 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_CPP_PRIVATE_IMAGE_CAPTURE_CONFIG_PRIVATE_H_
+#define PPAPI_CPP_PRIVATE_IMAGE_CAPTURE_CONFIG_PRIVATE_H_
+
+#include "ppapi/c/private/ppb_image_capture_config_private.h"
+#include "ppapi/cpp/resource.h"
+#include "ppapi/cpp/size.h"
+
+/// @file
+/// This file defines the ImageCaptureConfig_Private interface for
+/// establishing an image capture configuration resource within the browser.
+namespace pp {
+
+/// The <code>ImageCaptureConfig_Private</code> interface contains methods for
+/// establishing image capture configuration within the browser. The new
+/// configuration will take effect after <code>
+/// ImageCaptureConfig_Private.SetConfig</code> is called.
+class ImageCaptureConfig_Private {
+ public:
+  /// Default constructor for creating an is_null()
+  /// <code>ImageCaptureConfig_Private</code> object.
+  ImageCaptureConfig_Private();
+
+  /// The copy constructor for <code>ImageCaptureConfig_Private</code>.
+  ///
+  /// @param[in] other A reference to a <code>ImageCaptureConfig_Private
+  /// </code>.
+  ImageCaptureConfig_Private(const ImageCaptureConfig_Private& other);
+
+  /// Constructs a <code>ImageCaptureConfig_Private</code> from a <code>
+  /// Resource</code>.
+  ///
+  /// @param[in] resource A <code>PPB_ImageCaptureConfig_Private</code>
+  /// resource.
+  explicit ImageCaptureConfig_Private(const Resource& resource);
+
+  /// Constructs a <code>ImageCaptureConfig_Private</code> object.
+  ///
+  /// @param[in] instance The instance with which this resource will be
+  /// associated.
+  explicit ImageCaptureConfig_Private(const InstanceHandle& instance);
+
+  /// A constructor used when you have received a <code>PP_Resource</code> as a
+  /// return value that has had 1 ref added for you.
+  ///
+  /// @param[in] resource A <code>PPB_ImageCaptureConfig_Private</code>
+  /// resource.
+  ImageCaptureConfig_Private(PassRef, PP_Resource resource);
+
+  // Destructor.
+  ~ImageCaptureConfig_Private();
+
+  /// GetPreviewSize() returns the preview image size in pixels for the given
+  /// <code>ImageCaptureConfig_Private</code>.
+  ///
+  /// @param[out] preview_size A <code>Size</code> that indicates the
+  /// requested preview image size.
+  void GetPreviewSize(Size* preview_size);
+
+  /// SetPreviewSize() sets the preview image size for the given <code>
+  /// ImageCaptureConfig_Private</code>.
+  ///
+  /// @param[in] preview_size A <code>Size</code> that indicates the
+  /// requested preview image size.
+  void SetPreviewSize(const Size& preview_size);
+
+  /// GetJpegSize() returns the JPEG image size in pixels for the given
+  /// <code>ImageCaptureConfig_Private</code>.
+  ///
+  /// @param[out] jpeg_size A <code>Size</code> that indicates the current
+  /// JPEG image size.
+  void GetJpegSize(Size* jpeg_size);
+
+  /// SetJpegSize() sets the JPEG image size for the given <code>
+  /// ImageCaptureConfig_Private</code>.
+  ///
+  /// @param[in] jpeg_size A <code>Size</code> that indicates the requested
+  /// JPEG image size.
+  void SetJpegSize(const Size& jpeg_size);
+
+  /// IsImageCaptureConfig() determines if the given resource is a
+  /// <code>ImageCaptureConfig_Private</code>.
+  ///
+  /// @param[in] resource A <code>Resource</code> corresponding to an image
+  /// capture config resource.
+  ///
+  /// @return true if the given resource is an <code>
+  /// ImageCaptureConfig_Private</code> resource, otherwise false.
+  static bool IsImageCaptureConfig(const Resource& resource);
+};
+
+} // namespace pp
+
+#endif  /* PPAPI_CPP_PRIVATE_IMAGE_CAPTURE_CONFIG_PRIVATE_H_ */
+
diff --git a/ppapi/cpp/private/image_capture_private.h b/ppapi/cpp/private/image_capture_private.h
new file mode 100644
index 0000000..ab4afbb
--- /dev/null
+++ b/ppapi/cpp/private/image_capture_private.h
@@ -0,0 +1,179 @@
+/* Copyright 2014 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_CPP_PRIVATE_IMAGE_CAPTURE_PRIVATE_H_
+#define PPAPI_CPP_PRIVATE_IMAGE_CAPTURE_PRIVATE_H_
+
+#include "ppapi/c/private/ppb_image_capture_private.h"
+#include "ppapi/cpp/completion_callback.h"
+#include "ppapi/cpp/private/camera_capabilities_private.h"
+#include "ppapi/cpp/private/image_capture_config_private.h"
+#include "ppapi/cpp/resource.h"
+#include "ppapi/cpp/var.h"
+
+/// @file
+/// Defines the <code>ImageCapture_Private</code> interface. Used for
+/// acquiring a single still image from a camera source.
+namespace pp {
+
+/// To capture a still image with this class, use the following steps.
+/// 1. Create an ImageCapture_Private object by the constructor.
+/// 2. Call GetCameraCapabilities to get the supported preview sizes.
+/// 3. For optimal performance, set one of the supported preview size as the
+///    constraints of getUserMedia. Use the created MediaStreamVideoTrack for
+///    camera previews.
+/// 4. Set the same preview size and other settings by SetConfig.
+/// 5. Call CaptureStillImage to capture a still image. Play the shutter sound
+///    in the shutter callback. The image from the preview callback can be used
+///    for display. JPEG image will be returned to the JPEG callback.
+class ImageCapture_Private {
+ public:
+  /// Default constructor for creating an is_null()
+  /// <code>ImageCapture_Private</code> object.
+  ImageCapture_Private();
+
+  /// Creates an ImageCapture_Private resource.
+  ///
+  /// @param[in] instance A <code>PP_Instance</code> identifying one instance
+  /// of a module.
+  /// @param[in] camera_source_id A <code>Var</code> identifying a camera
+  /// source. The type is string. The ID can be obtained from
+  /// MediaStreamTrack.getSources() or MediaStreamVideoTrack.id. If a
+  /// MediaStreamVideoTrack is associated with the same source and the track
+  /// is closed, this ImageCapture_Private object can still do image capture.
+  /// @param[in] error_callback A <code>ImageCapture_Private_ErrorCallback
+  /// </code> callback to indicate the image capture has failed.
+  /// @param[inout] user_data An opaque pointer that will be passed to the
+  /// callbacks of ImageCapture_Private.
+  ImageCapture_Private(const InstanceHandle& instance,
+                       const Var& camera_source_id,
+                       PPB_ImageCapture_Private_ErrorCallback error_callback,
+                       void* user_data);
+
+  /// Constructs a <code>ImageCapture_Private</code> from a <code>
+  /// Resource</code>.
+  ///
+  /// @param[in] resource A <code>ImageCapture_Private</code>
+  /// resource.
+  explicit ImageCapture_Private(const Resource& resource);
+
+  /// A constructor used when you have received a <code>PP_Resource</code> as a
+  /// return value that has had 1 ref added for you.
+  ///
+  /// @param[in] resource A <code>ImageCapture_Private</code>
+  /// resource.
+  ImageCapture_Private(PassRef, PP_Resource resource);
+
+  // Destructor.
+  ~ImageCapture_Private();
+
+  /// Disconnects from the camera and cancels all pending capture requests.
+  /// After this returns, no callbacks will be called. If <code>
+  /// ImageCapture_Private</code> is destroyed and is not closed yet, this
+  /// function will be automatically called. Calling this more than once has no
+  /// effect.
+  ///
+  /// @param[in] callback <code>CompletionCallback</code> to be called upon
+  /// completion of <code>Close()</code>.
+  ///
+  /// @return An int32_t containing a result code from <code>pp_errors.h</code>.
+  int32_t Close(const CompletionCallback& callback);
+
+  /// Sets the configuration of the image capture.
+  /// If <code>SetConfig()</code> is not called, default settings will be used.
+  ///
+  /// @param[in] config A <code>ImageCaptureConfig_Private</code> object.
+  /// @param[in] callback <code>CompletionCallback</code> to be called upon
+  /// completion of <code>SetConfig()</code>.
+  ///
+  /// @return An int32_t containing a result code from <code>pp_errors.h</code>.
+  /// Returns <code>PP_ERROR_INPROGRESS</code> if there is a pending call of
+  /// <code>SetConfig()</code> or <code>CaptureStillImage()</code>.
+  /// If an error is returned, the configuration will not be changed.
+  int32_t SetConfig(const ImageCaptureConfig_Private& config,
+                    const CompletionCallback& callback);
+
+  /// Gets the configuration of the image capture.
+  ///
+  /// @param[in] callback A <code>CompletionCallbackWithOutput</code>
+  /// to be called upon completion.
+  ///
+  /// @return An int32_t containing a result code from <code>pp_errors.h</code>.
+  int32_t GetConfig(
+      const CompletionCallbackWithOutput<ImageCaptureConfig_Private>& callback);
+
+  /// Gets the camera capabilities.
+  ///
+  /// The camera capabilities do not change for a given camera source.
+  ///
+  /// @param[in] callback A <code>CompletionCallbackWithOutput</code>
+  /// to be called upon completion.
+  ///
+  /// @return An int32_t containing a result code from <code>pp_errors.h</code>.
+  int32_t GetCameraCapabilities(
+      const CompletionCallbackWithOutput<CameraCapabilities_Private>& callback);
+
+  /// Captures a still JPEG image from the camera.
+  ///
+  /// Triggers an asynchronous image capture. The camera will initiate a series
+  /// of callbacks to the application as the image capture progresses. The
+  /// callbacks will be invoked in the order of shutter callback, preview
+  /// callback, and JPEG callback. The shutter callback occurs after the image
+  /// is captured. This can be used to trigger a sound to let the user know that
+  /// image has been captured. The preview callback occurs when a scaled, fully
+  /// processed preview image is available. The JPEG callback occurs when the
+  /// compressed image is available. If there is an error after the capture is
+  /// in progress, the error callback passed to <code>
+  /// ImageCapture_Private.Create()</code> will be invoked. All the callbacks
+  /// are invoked by the thread that calls this function.
+  ///
+  /// The size of the preview image in preview callback is determined by
+  /// <code>ImageCaptureConfig_Private.SetPreviewSize</code>. The format is
+  /// decided by the camera and can be got from <code>VideoFrame.GetFormat
+  /// </code>. The size of the JPEG image is determined by <code>
+  /// ImageCaptureConfig_Private.SetJpegSize</code>.
+  ///
+  /// The camera may need to stop and re-start streaming during image capture.
+  /// If some MediaStreamVideoTrack are associated with the camera source, they
+  /// will receive mute and unmute events. The mute event will be received
+  /// before all the callbacks. The unmute event will be received after all the
+  /// callbacks. The preview image will not be sent to the video tracks
+  /// associated with the camera.
+  ///
+  /// @param[in] shutter_callback A <code>
+  /// ImageCapture_Private_ShutterCallback</code> callback to indicate the
+  /// image has been taken.
+  /// @param[in] preview_callback A <code>
+  /// ImageCapture_Private_PreviewCallback</code> callback to return a
+  /// preview of the captured image.
+  /// @param[in] jpeg_callback A <code>
+  /// ImageCapture_Private_JpegCallback</code> callback to return captured
+  /// JPEG image.
+  /// @param[out] sequence_id The sequence ID is a unique monotonically
+  /// increasing value starting from 0, incremented every time a new request
+  /// like image capture is submitted.
+  ///
+  /// @return An int32_t containing a result code from <code>pp_errors.h</code>.
+  /// PP_OK means the callbacks will be triggered. Other values mean the
+  /// callbacks will not be triggered.
+  int32_t CaptureStillImage(
+      PPB_ImageCapture_Private_ShutterCallback shutter_callback,
+      PPB_ImageCapture_Private_PreviewCallback preview_callback,
+      PPB_ImageCapture_Private_JpegCallback jpeg_callback,
+      int64_t* sequence_id);
+
+  /// Determines if a resource is an image capture resource.
+  ///
+  /// @param[in] resource The <code>Resource</code> to test.
+  ///
+  /// @return true if the given resource is an image capture resource or false
+  /// otherwise.
+  static bool IsImageCapture(const Resource& resource);
+};
+
+} // namespace pp
+
+#endif  /* PPAPI_CPP_PRIVATE_IMAGE_CAPTURE_PRIVATE_H_ */
+