Tasmota DisplayText command: How to draw text over filled rectangle/circle with transparent background

[jkwim]

I am trying to draw text over a filled circle as follows:

DisplayText [z][Ci15Bi1][Ci16x199y199K40][Ci5x180y185f2s1]CAR

1. Display background Color index is set to Black using Ci15Bi1 command.
2. Blue Circle drawn using [Ci16x199y199K40] command.
3. Text drawn in Red color using [Ci5x180y185f2s1]CAR command.

The problem is the Text is drawn with black background over the blue filled circle.

I want the text to be drawn with a transparent background over the filled blue circle.

How should I do that?

Currently I get this:

What I want is this:

[jkwim]

I managed to achieve the effect by blindly copying the following command from an example in the documentation.
[dc19:31000]
However there is no explanation as to what this command does.

Final command line is:
DisplayText [z][Ci15Bi1][Ci16x199y199K40][dc19:31000][x180y185f2s1Ci5]CAR

Can someone explain the command [dc19:31000] please?

[sfromis]

Not trying to explain, but I observe that the docs says:

dcI:V = define index color entry Index 19-31, V 16 bit color value (index 0-18 is fixed)

And:

You may expand the index color table up from index 19 to 31. the cmd [dcI:V] defines the index color with index I (19-31) to the 16 bit color value V

It looks like the color value V is in RGB565 representation

[jkwim]

So then the context is:

This is the code snippet I looked at

; define index color
[dc19:31000]
; draw transparent text with new index color
[x60y30f2Ci19D2]Tasmota

First color index 19 is defined and then use that color with Ci19 right?

Then the command for Transparent Text drawing must be the D2 above.
DisplayText [Ci7x199y199K35][Ci0D2x175y180f2s1]CAR[x182y199f2s1]ON[D0][f1]
Based on a wild guess I used D2 to turn on transparent text but then all text started to become transparent on subsequent iterations.
So I made another wild guess and added D0 at the end to turn off and it seemed to work.

[jkwim]

Documentation had this but I could not comprehend it.

Dp = switch display drawing options:
bit 0: auto updates => 1 auto draw on each displaytext cmd, 0 display must be updated manually with d
( only valid for bw oled and epaper displays, color displays draw always immediately)
bit 1: character drawing => 0 opaque character drawing, 1 transparent character drawing

Now it makes sense.

D0 = 00
D1 = 01
D2 = 10
D3 = 11