image always appears cut off

[lucasromeiro]

I use some images on my LCD, but I'm trying to convert a 13x13 pixel image to show in lcd as bitmap.
I do not know why, the image always appears cut off.

use:
ssd1306_drawBitmap (2, 40, 13, 13, exclamationNormal);

const uint8_t exclamationNormal [] PROGMEM = {
0x00, 0x00, 0xC0, 0x70, 0x1C, 0x06, 0xF3, 0x06, 0x1C, 0x70, 0xC0, 0x00, 0x00, 0x0C, 0x0F, 0x09,
0x08, 0x08, 0x08, 0x0A, 0x08,
};

last version
lcd ssd1306
last Arduino board and program

image: https://cdn.pbrd.co/images/HXaF5ZZ.bmp

Should I use canvas?????

[Aleksei]

Hello,
How did you get the image data? Which program did you use?
It looks like image data doesn't contain all pixels.

[lucasromeiro]

Hello,
How did you get the image data? Which program did you use?
It looks like image data doesn't contain all pixels.

Hello, I try:

LCDAssistant.exe
and
http://javl.github.io/image2cpp/

[Aleksei]

Can you try these data instead of yours:

// 'HXaF5ZZ', 13x13px
0xff, 0xff, 0x3f, 0x8f, 0xe3, 0xf9, 0x0c, 0xf9, 0xe3, 0x8f, 0x3f, 0xff, 0xff, 0x13, 0x10, 0x16
0x17, 0x17, 0x17, 0x15, 0x17, 0x17, 0x17, 0x16, 0x10, 0x13

[lucasromeiro]

Can you try these data instead of yours:

// 'HXaF5ZZ', 13x13px
0xff, 0xff, 0x3f, 0x8f, 0xe3, 0xf9, 0x0c, 0xf9, 0xe3, 0x8f, 0x3f, 0xff, 0xff, 0x13, 0x10, 0x16
0x17, 0x17, 0x17, 0x15, 0x17, 0x17, 0x17, 0x16, 0x10, 0x13

I had that for a comma after 0x16.
did not work.
The other tests were also cut off.

see: https://imgur.com/a/cwBJwVm

every time it's like this, with your code or mine. Cut 4 or 5 lines from the end. you can see?
I used this command:
ssd1306_drawBitmap (2, 40, 13, 13, exclamationNormal);
X and Y also did not fit correctly on the LCD. weird.

[Aleksei]

Please, read documentation carefully. The documentation to ssd1306_drawBitmap() says that height must be divided by 8 and y position is vertical position in blocks (pixels/8).
So, in your case the call should look like this:

ssd1306_drawBitmap (2, 5, 13, 16, exclamationNormal);
// where 5 = 40/8 and height is 16, since 16 can be divided by 8.

And still your data are incorrect, since they contain less than 26 bytes. If you use http://javl.github.io/image2cpp/, then please, choose Invert colors option, and code output format Arduino, and Draw mode Vertical. After all that, you will get what you need:

// 'HXaF5ZZ', 13x13px
const unsigned char exclamationNormal [] PROGMEM = {
        0x00, 0x00, 0xc0, 0x70, 0x1c, 0x06, 0xf3, 0x06, 0x1c, 0x70, 0xc0, 0x00, 0x00, 0x0c, 0x0f, 0x09,
        0x08, 0x08, 0x08, 0x0a, 0x08, 0x08, 0x08, 0x09, 0x0f, 0x0c
};

void setup()
{
    ssd1306_128x64_i2c_init();

    ssd1306_clearScreen();
    ssd1306_drawBitmap (2, 5, 13, 16, exclamationNormal);
}

Alternatively, you can you use gfx_drawMonoBitmap():

gfx_drawMonoBitmap(2, 40, 13, 16, exclamationNormal);

[lucasromeiro]

Great!
This was the problem!
Thanks for the orientations!