Description
I use LVGL on the ARM LINUX development board, and the graphics driver is DRM. On my hardware platform, DRM has two display planes, and LVGL has been successfully displayed on the upper plane. I want to display the video on the lower plane, so I need the LVGL on the upper plane to have a transparent background. But I cannot achieve this effect.
The display is correct without using a transparent background. If you use a transparent background, you will not be able to see the lower layer of the screen. The static controls of LVGL itself will also flash once when starting, and then disappear. Only dynamic controls (such as Spinner) will be displayed incompletely. Remember to try V8.3.6 version to see the lower layer of the screen, but the static controls still cannot be displayed. Simultaneously, the edge color of the dynamic control is abnormal
What MCU/Processor/Board and compiler are you using?
ROCKCHIP RV1126
What LVGL version are you using?
V8.3.10
What do you want to achieve?
The LVGL displayed on the upper layer has a transparent background。
What have you tried so far?
I have verified using the modetest tool that images can be displayed separately on two planes of DRM. I tried configuring it:
-
Set the screen’s opacity to
LV_OPA_TRANSPe.g. withlv_obj_set_style_bg_opa(lv_scr_act(), LV_OPA_TRANSP, LV_PART_MAIN) -
Set the display opacity to
LV_OPA_TRANSPwithlv_disp_set_bg_opa(NULL, LV_OPA_TRANSP);
LV_ COLOR_ DEPTH=32
LV_ COLOR_ SCREEN_ TRANSP=1
Code to reproduce
Add a code snippet which can run in the simulator. It should contain only the relevant code that compiles without errors when separated from your main code base.
The code block(s) should be formatted like:
/*You code here*/
Screenshot and/or video
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