Issue with background image rendering in LVGL 8.2.0 with LV_COLOR_DEPTH = 32

General discussion
1

I use lv_disp_set_bg_image to set a background image when LV_COLOR_DEPTH = 32 and this image displays incorrectly. Only part of the image is drawn as a repeating tile down the screen, showing the same part of the image, with the height of the tile being the same as the number of lines set for disp_buf

This used to work fine and render the full image in earlier 8.x versions, but I cannot recall which was the last version. Unable to recreate in CodeBlocks simulator on Windows because I can’t figure out how/where to set a partial screen buffer :slight_smile: With a full screen buffer in CodeBlocks, it renders correctly.

2

Hi,

I’ve just pushed a fix. :slight_smile:

3

Thanks, just tested and it works perfectly!

4

I have similar issue but thought that is some sort of HW issue with ESP32+Ili9341 LCD and Arduino.
I have exported project from SquareLine Studio and if I set color depth to 32, output looks like this.

20220412_144400
20220412_1444004248×5664 3.08 MB

Screen should look like this and it is OK with 16bit depth.
image

I change content of the lv_refr.c from this commit but without change. Should I change something else as well?

@egonbeermat did you have similar issue or my one is complitely different? Thanks

I´m using Arduino IDE 1.8.19, with ESP32 support version 2.0.2 and LVGL 8.2 from Library manager.

5

If you change the color depth in SLS, you ned to change it in the ILI9341 driver and LVGL (lv_conf.h, LV_COLOR_DEPTH) too.

6

Ok, problem is then in TFT_eSPI library which support just 16 bit color depth.

Thanks