The buffer will not automatically switch when double full-screen buffer + direct_mode

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• Check the related part of the Documentation
• Update lvgl to the latest version
• Reproduce the issue in a Simulator

Describe the bug

The buffer will not automatically switch when double full-screen buffer + direct_mode.

To Reproduce

Expected behavior

The buffer will automatically switch when double full-screen buffer+direct_mode.

Screenshots or video

Disable direct_mode

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The buffer switching logic in the draw_buf_flush() function may be incorrect, because draw_buf->flushing_last may be cleared in the user's flush_cb (calling lv_disp_flush_ready())

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Can remove the line disp_drv->draw_buf->flushing_last = 0; in the lv_disp_flush_ready() function?

[kisvegabor]

The buffer switching logic in the draw_buf_flush() function may be incorrect, because draw_buf->flushing_last may be cleared in the user's flush_cb (calling lv_disp_flush_ready())

Finally, is this the reason of the missed buffer switching?

Can remove the line disp_drv->draw_buf->flushing_last = 0; in the lv_disp_flush_ready() function?

If so, I'd rather save the flushing_last in line 1004 and use the saved value in line 1015. What do you think?

[FASTSHIFT]

The buffer switching logic in the draw_buf_flush() function may be incorrect, because draw_buf->flushing_last may be cleared in the user's flush_cb (calling lv_disp_flush_ready())

Finally, is this the reason of the missed buffer switching?

Can remove the line disp_drv->draw_buf->flushing_last = 0; in the lv_disp_flush_ready() function?

If so, I'd rather save the flushing_last in line 1004 and use the saved value in line 1015. What do you think?

Yes, I tried to remove the line disp_drv->draw_buf->flushing_last = 0;, the buffer can be switched normally.
I agree with the way to save the value of flushing_last.

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I tested it and it seems to work fine.

[kisvegabor]

Fixed, as discussed.