add img2code

[kossnikita]

Image to C code converter

img2code script converts images to C byte array (bitmap)

./img2code.py image.png

Which can be drawn on display by library

Example:

extern const SSD1306_bitmap_t bitmap;
ssd1306_DrawBitmap(0, 0, bitmap.bitmap, bitmap.w, bitmap.h, White);
ssd1306_UpdateScreen();

Animation

You can even convert GIF files!

./img2code.py animation.gif

This generates a bitmap for each frame, which can be accessed by index

Example:

extern const SSD1306_animation_t animation;
for(uint32_t i = 0; i < animation.frames; i++)
{
    ssd1306_DrawBitmap(0, 0, animation.frame[i], animation.w, animation.h,
                         White);
    ssd1306_UpdateScreen();
    delay_ms(200);
}

[kossnikita]

Is it possible to move scripts to /utils/ instead of /examples/? Because these are not exactly examples.

[afiskon]

Yes, feel free moving the scripts to /utils/ . Also please add an animation example to ssd1306_TestAll().

[afiskon]

I wonder if it will play badapple demo or at least part of it :) e.g. https://tenor.com/ru/view/bad-apple-manu-touhou-gif-21182229
In order to achieve this a control of playback speed and/or frame rate may be needed.
This would be a good load test for the feature.

[kossnikita]

Finally, my first Bad Apple 😂

I don't have Nucleo, so I created a project for Black Pill. It might be compatible to Nucleo board. Could you test this from your side?

Also I spot some artifacts. Black dots of white background spawn for some reason. Not sure, maybe Pillow generate them.

Do you have any gif to add to test?

[kossnikita]

Not sure, maybe Pillow generate them

It looks like I was right, these dots are also present in the original images. Bruh.

[afiskon]

I just thought it would be fun to use a piece of BadApple animation. I realize it's a large demo and will probably require using an external SD card and loading the frames in the runtime. All this is out of scope of the pull request. Feel free using any GIF you like in order to test the functionality.

Please rebase the PR.

[kossnikita]

Do you mean remove bad apple demo from the library?

[afiskon]

No I meant that I don't insist on using Bad Apple if this is too much effort.

The PR looks good to me. If there are no last-minute changes I'm going to merge it.

[kossnikita]

This PR still needed a test case