Weird graphical glitch in the display of content.

[rttgnck]

Weird graphical glitch in the display of content.

[rttgnck]

I think I had solved it sometime back and forgot to say something. I'll try to dig back into my code and see what I did or if I left myself any clues

[rttgnck]

I really hope you found a solution and share it

So I will have to look further, possibly fork, and upload my changes.

At first glance, it looks like I rendered a new font.
I also changed a section of the epd_driver.c which is part of the epdiy repo, not this one.
Pretty sure I also changed the font size, or line height, to get a few more words on a page.

In my personal changes I was adding a section page count, and trying to add a bookmark of sorts so when the unit restarts you can jump back to the page you were on (not even close to have that).

It would be a little while before I had a chance to clean up my local copy for a fork.

[dronix27]

The same in Cyrillic

[dronix27]

I think I had solved it sometime back and forgot to say something. I'll try to dig back into my code and see what I did or if I left myself any clues

I really hope you found a solution and share it

[dronix27]

Is the problem still not resolved?

[rttgnck]

I have not explored anything further. It's unfortunately not really top of my priority list right now.

…

On Thu, Sep 8, 2022, 03:31 dronix27 ***@***.***> wrote: Is the problem still not resolved? — Reply to this email directly, view it on GitHub <#81 (comment)>, or unsubscribe <https://github.com/notifications/unsubscribe-auth/AHKO4USDXVEJDA6RW6DMW6TV5GP5ZANCNFSM5SMX26FQ> . You are receiving this because you authored the thread.Message ID: ***@***.***>

[Lefucjusz]

I've run into the exact same problem on my M5Paper, it looks that the nibbles in each byte sent to the display are swapped. I didn't read very deeply into the code, but it looks that swapping them in epd_driver.c:epd_draw_pixel() resolves the issue. The original code looks like this:

void epd_draw_pixel(int x, int y, uint8_t color, uint8_t *framebuffer) {

  ...some stuff here...

  uint8_t *buf_ptr = &framebuffer[y * EPD_WIDTH / 2 + x / 2];
  if (x % 2) {
    *buf_ptr = (*buf_ptr & 0x0F) | (color & 0xF0);
  } else {
    *buf_ptr = (*buf_ptr & 0xF0) | (color >> 4);
  }
}

Just change the condition to if (!(x % 2)) or exchange the lines between if and else and the image will no longer be weirdly shifted.