Processing method and device after acquiring vertical synchronization time during image update

Abstract

The invention discloses a processing method after acquiring vertical synchronization time during image update, which comprises the following steps of: when the vertical synchronization is not enabled, acquiring system time t1 for calling update; acquiring system time 2 after the update is completed; when the vertical synchronization is enabled, acquiring system time T1 when a vertical synchronization signal arrives at a certain time and after the update is completed; calculating system time T_sync1 for the vertical synchronization singal to arrive according to t1, t2 and T1; calculating time difference T_diff of two adjacent vertical synchronization signals according to a screen refresh rate; acquiring system time T-syncn for each vertical synchronization signal to arrive in advance by taking the T_sync1 as a reference according to the T_diff; when the vertical synchronization is enabled, acquiring system time kn for calling the update each time; acquiring time difference Mn between the system time for calling the update and the system time for the vertical synchronization signal to arrive in advance according to kn and the T_syncn; and during update each time, running other application programs by the system in Mn.

Description

technical field [0001] The present invention relates to the field of image processing, in particular to a method and device for processing after a vertical synchronization time when an image is updated. Background technique [0002] A simple image display process from the computer graphics card to the monitor: the computer system application call interface, the graphics card writes the image data into the display buffer, reads and transmits the data in the display buffer to the monitor, and the monitor is responsible for displaying the data on the screen superior. [0003] The system "writes" the image data into the display buffer of the graphics card, and the monitor "reads" the image data in the display buffer and displays it. Under the premise of these two steps without any restrictions, it is possible that the two steps are executed at the same time. At a certain moment, after the graphics card completes the "writing" buffer operation of the i-th frame image, it is perf...

AI Technical Summary

Problems solved by technology

As can be seen from the figure above, there is a time difference between the application "calling for update" and the "actual update" of the graphics card, and within this time difference, the application can only passively block and wait when updating the image, resulting in a waste of system resources

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