Request: provide API to draw XBM bitmap from monochrome buffer with given height/width

[ghost]

The API should be a functional equivalent to:

https://github.com/olikraus/u8g2/wiki/u8g2reference#drawxbm=

Description: Draw a XBM Bitmap. Position (x,y) is the upper left corner of the bitmap. XBM contains monochrome, 1-bit bitmaps. The current color index is used for drawing (see setColorIndex) pixel values 1. Version 2.15.x of U8g2 introduces a solid and a transparent mode for bitmaps. By default, drawXBM will draw solid bitmaps. This differs from the previous versions: Use setBitmapMode(1) to switch to the previous behavior. The XBMP version of this procedure expects the bitmap to be in PROGMEM area (AVR only). Many tools (including GIMP) can save a bitmap as XBM. A nice step by step instruction is here (external link). The result will look like this:

#define u8g_logo_width 38
#define u8g_logo_height 24
static unsigned char u8g_logo_bits[] = {
   0xff, 0xff, 0xff, 0xff, 0x3f, 0xff, 0xff, 0xff, 0xff, 0x3f, 0xe0, 0xe0,
...
   0xff, 0x3f, 0xff, 0xff, 0xff, 0xff, 0x3f, 0xff, 0xff, 0xff, 0xff, 0x3f };

[ghost]

The abstraction example can be found here: https://github.com/olikraus/u8g2/blob/adb13305ffa963ca04d68f4444201ab0ba56f905/sys/utf8/xbm_picture_loop/main.c

[nopnop2002]

The API should be a functional equivalent to:

I don't think so.

[ghost]

If you can't or don't want to put the time into writing it, that is fine and entirely up to you, I don't have the time to write it myself right now.

[nopnop2002]

There are two ways to control the ssd1306.

1. Output in page units. It does not require internal memory and operates at high speed.

2. Redraw the entire TFT 8 pages * 128 segment internal memory is required. And you need a flash function like utf8_show (). Nothing is displayed unless utf8_show () is done. Even when changing one character on the TFT, the entire drawing is performed.

A second method is needed to draw at Position (x, y).

Because SSD1306 can only operate pages.

SSD1306 has the concept of X position(=segment position), but not the concept of Y position.

Use the page number instead of the Y position.

[ghost]

Trying to find the source of the API, but this example is more accurate than the one I posted before: https://github.com/olikraus/u8g2/blob/master/sys/arduino/u8g2_page_buffer/XBM/XBM.ino

A function that is dependent on one single width seems a bit limited to me.

[nopnop2002]

I found that XBM bitmap format is very usefull.

This page is very useful. https://www.mischianti.org/2021/07/14/ssd1306-oled-display-draw-images-splash-and-animations-2/

[ghost]

Excellent! Your repositories are a blessing, is there a way I can send you coffee/beer/bento money?

[nopnop2002]

is there a way I can send you coffee/beer/bento money?

No, thanks.

I was able to gain knowledge of XBM bitmaps.