PPAPI: implement GetSupportedPreviewSizes

ppapi/c/private/ppb_image_capture_private.h

 /* 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.
  */
 
 /* From private/ppb_image_capture_private.idl,
- *   modified Wed Aug 13 17:26:13 2014.
+ *   modified Mon Feb  2 21:41:55 2015.
  */
 
 #ifndef PPAPI_C_PRIVATE_PPB_IMAGE_CAPTURE_PRIVATE_H_
 #define PPAPI_C_PRIVATE_PPB_IMAGE_CAPTURE_PRIVATE_H_
 
 #include "ppapi/c/pp_bool.h"
 #include "ppapi/c/pp_completion_callback.h"
 #include "ppapi/c/pp_instance.h"
 #include "ppapi/c/pp_macros.h"
 #include "ppapi/c/pp_resource.h"
@@ skipping 99 matching lines @@
  * 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.
  */
 struct PPB_ImageCapture_Private_0_1 {
   /**
    * Creates a PPB_ImageCapture_Private resource.
    *
    * @param[in] instance A <code>PP_Instance</code> identifying one instance
    * of a module.
-   * @param[in] camera_source_id A <code>PP_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 PPB_ImageCapture_Private object can still do image capture.
-   * @param[in] error_callback A <code>PPB_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 PPB_ImageCapture_Private.
    *
    * @return A <code>PP_Resource</code> corresponding to a
    * PPB_ImageCapture_Private resource if successful, 0 if failed.
    */
-  PP_Resource (*Create)(PP_Instance instance,
-                        struct PP_Var camera_source_id,
-                        PPB_ImageCapture_Private_ErrorCallback error_callback,
-                        void* user_data);
+  PP_Resource (*Create)(PP_Instance instance);
   /**
    * Determines if a resource is an image capture resource.
    *
    * @param[in] resource The <code>PP_Resource</code> to test.
    *
    * @return A <code>PP_Bool</code> with <code>PP_TRUE</code> if the given
    * resource is an image capture resource or <code>PP_FALSE</code>
    * otherwise.
    */
   PP_Bool (*IsImageCapture)(PP_Resource resource);
   /**
+   * Opens a video capture device.
+   *
+   * @param[in] image_capture A <code>PP_Resource</code> corresponding to an
+   * image capture resource.
+   * @param[in] device_id A <code>PP_Var</code> identifying a camera device. 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 PPB_ImageCapture_Private
+   * object can still do image capture.
+   * @param[in] callback A <code>PP_CompletionCallback</code> to be called upon
+   * completion of <code>Open()</code>.
+   *
+   * @return An error code from <code>pp_errors.h</code>.
+   */
+  int32_t (*Open)(PP_Resource image_capture,
+                  struct PP_Var device_id,
+                  struct PP_CompletionCallback callback);
+  /**
    * Disconnects from the camera and cancels all pending capture requests.
    * After this returns, no callbacks will be called. If <code>
    * PPB_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] image_capture A <code>PP_Resource</code> corresponding to an
    * image capture resource.
-   * @param[in] callback <code>PP_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)(PP_Resource resource, struct PP_CompletionCallback callback);
+  void (*Close)(PP_Resource image_capture);

[wuchengli, 2015/02/03 02:46:29]

Does this return immediately and the implementation release the resources
asynchronously? Or this can take a long time to finish?

[Justin Chuang, 2015/02/03 12:32:08]

The former case.

   /**
    * Sets the configuration of the image capture.
    * If <code>SetConfig()</code> is not called, default settings will be used.
    *
    * @param[in] image_capture A <code>PP_Resource</code> corresponding to an
    * image capture resource.
    * @param[in] config A <code>PP_ImageCaptureConfig_Private</code> object.
    * @param[in] callback <code>PP_CompletionCallback</code> to be called upon
    * completion of <code>SetConfig()</code>.
    *
@@ skipping 94 matching lines @@
       int64_t* sequence_id);
 };
 
 typedef struct PPB_ImageCapture_Private_0_1 PPB_ImageCapture_Private;
 /**
  * @}
  */
 
 #endif  /* PPAPI_C_PRIVATE_PPB_IMAGE_CAPTURE_PRIVATE_H_ */