![]() SurfaceFlinger must always display something, so it hangs on to one buffer. ![]() If SurfaceFlinger finds a new buffer, SurfaceFlinger acquires the buffer if not, SurfaceFlinger continues to use the previously acquired buffer. When SurfaceFlinger receives the VSYNC signal, SurfaceFlinger walks through its list of layers looking for new buffers. The VSYNC signal indicates that the display can be refreshed without tearing. When the display is between refreshes, the display sends the VSYNC signal to SurfaceFlinger. This minimizes memory usage and avoids visible tearing on the screen, which can occur when updating the display mid-refresh. ![]() Though apps can submit buffers at any time, SurfaceFlinger only wakes up to accept buffers between display refreshes, which can differ depending on the device. The following table includes more details about ASurfaceControl and its associated components.ĪSurfaceControl Wraps SurfaceControl and enables an app to create SurfaceControls that correspond to layers on the display.Ĭan be created as a child of ANativeWindow or as a child of another ASurfaceControl.ĪSurfaceTransaction Wraps Transaction to enable the client to edit a layer's descriptive properties, such as geometry, and sends the updated buffers to SurfaceFlinger.ĪSurfaceTransactionStats Sends information about transactions that have been presented, such as latch time, acquire times, and previous release fence, to an app through a preregistered callback. Apps then get information about ASurfaceTransactions through callbacks that pass ASurfaceTransactionStats containing information, such as latch time, acquire times, and so on. An ASurfaceControl is associated with a layer, which apps update through ASurfaceTransactions. ASurfaceControl combines a surface and a SurfaceControl into one transaction package that is sent to SurfaceFlinger. WindowManager then sends the surface to the app, but keeps the SurfaceControl to manipulate the appearance of the app on the screen.Īndroid 10 adds ASurfaceControl, which is another way that SurfaceFlinger can accept buffers. SurfaceFlinger creates the layer and sends it to WindowManager. A layer is a combination of a surface, which contains the BufferQueue, and a SurfaceControl, which contains the layer metadata like the display frame. WindowManager then requests a layer from SurfaceFlinger. When an app comes to the foreground, it requests buffers from WindowManager. One way SurfaceFlinger accepts buffers is through BufferQueue and SurfaceControl. SurfaceFlinger can accept buffers in two ways: through BufferQueue and SurfaceControl, or through ASurfaceControl. WindowManager provides SurfaceFlinger with buffers and window metadata, which SurfaceFlinger uses to composite surfaces to the display. SurfaceFlinger accepts buffers, composes buffers, and sends buffers to the display. ![]() Send feedbackSurfaceFlinger and WindowManager It's 7 months and even google themselves didn't fix it but here is technically info of the API introduction in Android 10 Android Open Source Project Only people knowing how to access the flag for example now understand how to fix. It's available in beta and official release now.īesides that it works I actually wonder what Android SurfaceControl was supposed to do in chromium based browsers and why so many browsers had this problem. Officially fixed by disabling the "Android SurfaceControl" flag for Android 10 or higher in opera://flags ![]()
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |