在此页

• 句法
• 规范
• 浏览器兼容性
• 另请参阅
• 相关话题

MediaTrackSettings dictionary's logicalSurface property indicates whether or not the display area being captured is a logical surface. Logical surfaces are those which are not necessarily entirely onscreen, or may even be off-screen, such as windows' backing buffers (where only part of the buffer is visible without scrolling the containing window) and offscreen rendering contexts.

句法

isLogicalSurface = mediaTrackSettings.logicalSurface;
					

值

A Boolean value which is true if the video track in the stream of captured video is taken from a logical display surface.

The most common scenario in which a display surface may be a logical one is if the selected surface contains the entire content area of a window which is too large to display onscreen at once. Since the window that contains the surface has to be scrolled to show the rest of the contents, the surface is a logical one.

A visible display surface (that is, a surface for which logicalSurface 返回 false ) is the portion of a logical display surface which is currently visible onscreen.

For example, a user agent may choose to allow the user to choose whether to share the entire document (a 浏览器 with logicalSurface value of true ), or just the currently visible portion of the document (where the logicalSurface 的 浏览器 surface is false ).

规范

规范	状态	注释
Screen Capture The definition of 'MediaTrackSettings.logicalSurface' in that specification.	工作草案	初始定义

浏览器兼容性

The compatibility table on this page is generated from structured data. If you'd like to contribute to the data, please check out https://github.com/mdn/browser-compat-data and send us a pull request. 更新 GitHub 上的兼容性数据

	桌面						移动
	Chrome	Edge	Firefox	Internet Explorer	Opera	Safari	Android webview	Chrome for Android	Firefox for Android	Opera for Android	Safari on iOS	Samsung Internet
logicalSurface	Chrome 71	Edge ≤79	Firefox No	IE No	Opera Yes	Safari ?	WebView Android 71	Chrome Android 71	Firefox Android No	Opera Android ?	Safari iOS ?	Samsung Internet Android 10.0

图例

完整支持

完整支持

不支持

不支持

兼容性未知 ?

兼容性未知

另请参阅

• Screen Capture API
• Using the screen capture API
• Capabilities, constraints, and settings
• MediaDevices.getDisplayMedia()
• MediaStreamTrack.getConstraints()
• MediaStreamTrack.applyConstraints()
• MediaStreamTrack.getSettings()

元数据

• 最后修改： Dec 23, 2019

相关话题

1. Media Streams API
2. MediaTrackSettings
3. 特性

   1. aspectRatio
   2. autoGainControl
   3. channelCount
   4. cursor
   5. deviceId
   6. displaySurface
   7. echoCancellation
   8. facingMode
   9. frameRate
   10. groupId
   11. height
   12. latency
   13. noiseSuppression
   14. sampleRate
   15. sampleSize
   16. volume
   17. width
4. Related pages for Media Capture and Streams

   1. AudioStreamTrack
   2. BlobEvent
   3. CanvasCaptureMediaStream
   4. ConstrainBoolean
   5. ConstrainDOMString
   6. ConstrainDouble
   7. ConstrainLong
   8. DoubleRange
   9. HTMLCanvasElement.captureStream()
   10. LongRange
   11. MediaDevices
   12. MediaStream
   13. MediaStreamTrack
   14. MediaStreamTrackEvent
   15. MediaTrackCapabilities
   16. MediaTrackConstraints
   17. MediaTrackSupportedConstraints
   18. Navigator.mediaDevices
   19. NavigatorUserMedia
   20. NavigatorUserMediaError
   21. VideoStreamTrack
   22. navigator.mediaDevices.getUserMedia()