GxEPD2 Adafruit GFX, placing icons over other bitmap image in one go, not one by one

Other Hardware Displays
1

I am using GxEPD2 (which is based on Adafruit GFX) and want to drawImage() - a calendar template with some icons on it.

I kind of achieved what I wanted, but the icons are being placed one by one and having 20-30 icons will take a long time to fill the tables as each placement is around a second.

What I was hoping to achieve is to place the template and all the icons in perhaps a memory or something and then draw from that memory in one go.

Here is what I got so far: over the calendar template I am adding week day letters (all bitmap icons 16x16) based on the current day of week, and I would like it to appear all at once, not one by one.

That is how I use it, first line is the calendar template, second line is the week day letter "S", third one is "M" :

display.drawImage((uint8_t *)epd_bitmap_Mockup_v2_MainScreen, 0, 0, 200, 200, false); // drawing the calendar template from bitmap
display.drawImage((uint8_t *)weekDays[0], 0, 12, 16, 16, false); // Black "S"
display.drawImage((uint8_t *)weekDays[2], 0, 37, 16, 16, false); // Black "M"

Later I add a black rectangle and invert the color of the week day like that:

display.fillRect(0, 9, 200, 24, GxEPD_BLACK); // Black rectangle over "Sunday"
display.displayWindow(0, 158, 200, 24);

display.drawImage((uint8_t *)weekDays[6], 0, 12, 16, 16, false); //White "S"

It is in a for loop and has some logic around the current week day in it, but I simplified it a bit. I hope this sample is enough to show how the code is constructing the view.

If anyone has some suggestions or a way to do it properly that would be great!

Thanks!
Vitally

2

draws directly through controller memory.

Use drawBitmap() of Adafruit_GFX instead for buffered drawing.

My board is ESP32-S3 Feather Adafruit

New post -> repeat all relevant information!

You can use full buffered drawing with your display, use display.display() to update to screen.

1 Like
3

@ZinggJM thank you so much! That worked. I just had to use the inverted method to be able to keep my generated bitmaps.

Just in case anyone is having the same issue:

  display.drawInvertedBitmap(0, 0, (uint8_t *)epd_bitmap_Mockup_v2_MainScreen, 200, 200, GxEPD_BLACK);

Thanks!
Vitally

4

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