зеркало из https://github.com/mozilla/gecko-dev.git
106 строки
3.0 KiB
C++
106 строки
3.0 KiB
C++
/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* vim:set ts=2 sw=2 sts=2 et cindent: */
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/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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#ifndef IMAGECAPTURE_H
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#define IMAGECAPTURE_H
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#include "mozilla/DOMEventTargetHelper.h"
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#include "mozilla/dom/ImageCaptureBinding.h"
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#include "prlog.h"
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class nsIDOMBlob;
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namespace mozilla {
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#ifdef PR_LOGGING
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#ifndef IC_LOG
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PRLogModuleInfo* GetICLog();
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#define IC_LOG(...) PR_LOG(GetICLog(), PR_LOG_DEBUG, (__VA_ARGS__))
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#endif
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#else
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#ifndef IC_LOG
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#define IC_LOG(...)
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#endif
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#endif // PR_LOGGING
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namespace dom {
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class File;
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class VideoStreamTrack;
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/**
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* Implementation of https://dvcs.w3.org/hg/dap/raw-file/default/media-stream-
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* capture/ImageCapture.html.
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* The ImageCapture accepts a VideoStreamTrack as input source. The image will
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* be sent back as a JPG format via Blob event.
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*
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* All the functions in ImageCapture are run in main thread.
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*
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* There are two ways to capture image, MediaEngineSource and MediaStreamGraph.
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* When the implementation of MediaEngineSource supports TakePhoto() in platform
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* like B2G, it uses the platform camera to grab image. Otherwise, it falls back
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* to the MediaStreamGraph way.
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*/
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class ImageCapture final : public DOMEventTargetHelper
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{
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public:
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NS_DECL_ISUPPORTS_INHERITED
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NS_DECL_CYCLE_COLLECTION_CLASS_INHERITED(ImageCapture, DOMEventTargetHelper)
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IMPL_EVENT_HANDLER(photo)
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IMPL_EVENT_HANDLER(error)
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// WebIDL members.
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void TakePhoto(ErrorResult& aResult);
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// The MediaStream passed into the constructor.
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VideoStreamTrack* GetVideoStreamTrack() const;
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// nsWrapperCache member
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virtual JSObject* WrapObject(JSContext* aCx, JS::Handle<JSObject*> aGivenProto) override
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{
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return ImageCaptureBinding::Wrap(aCx, this, aGivenProto);
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}
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// ImageCapture class members
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nsPIDOMWindow* GetParentObject() { return GetOwner(); }
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static already_AddRefed<ImageCapture> Constructor(const GlobalObject& aGlobal,
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VideoStreamTrack& aTrack,
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ErrorResult& aRv);
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ImageCapture(VideoStreamTrack* aVideoStreamTrack, nsPIDOMWindow* aOwnerWindow);
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// Post a Blob event to script.
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nsresult PostBlobEvent(File* aBlob);
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// Post an error event to script.
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// aErrorCode should be one of error codes defined in ImageCaptureError.h.
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// aReason is the nsresult which maps to a error string in dom/base/domerr.msg.
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nsresult PostErrorEvent(uint16_t aErrorCode, nsresult aReason = NS_OK);
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bool CheckPrincipal();
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protected:
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virtual ~ImageCapture();
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// Capture image by MediaEngine. If it's not support taking photo, this function
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// should return NS_ERROR_NOT_IMPLEMENTED.
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nsresult TakePhotoByMediaEngine();
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nsRefPtr<VideoStreamTrack> mVideoStreamTrack;
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};
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} // namespace dom
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} // namespace mozilla
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#endif // IMAGECAPTURE_H
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