Add Inkplate5V2 XKCD Random Webcomic Strip example

[stared]

I created it 6 months ago - rediscovered that. And sharing here, so you can use that as well.

Features

• Adds a new example that displays random XKCD comics on the Inkplate 5 V2
• On-device PNG scaling with aspect ratio preservation (grayscale 3-bit mode)
• Button press (GPIO 36) skips to next comic, auto-refresh every 60s
• Title and alt-text displayed at the bottom of the screen
• Robust HTTPS handling, chunked downloads, diagnostics logging

Files added

• examples/Inkplate5V2/Projects/Inkplate5V2_XKCD_Random_Webcomic_Strip/
  • Main sketch (.ino)
  • credentials.template.h - WiFi credential template (actual credentials.h is gitignored)
  • pngle_scaling.h / pngle_scaling.cpp - on-device PNG scaling using pngle library

Dependencies

• ArduinoJson library (install via Arduino IDE Library Manager)
• Built-in: WiFi, HTTPClient, pngle (included with Inkplate library)

[JosipKuci]

Hello @stared,
Great project and thank you for contributing! We are currently in the process of a big restructuring regarding the library, so i am keeping this pull request open for now, we will probably have to modify the code a bit to work with the aforementioned changes. Will keep you posted!

[stared]

Hi @JosipKuci, thanks for your kind words!
Sure, take your time.

Anyway, since we are on that topic, from my experience as a user, it would be great if it were not nearly as organized by device. I mean, except for some device-dependent demos, most were for as many as supported, with some possible flags or ifs.

[SrijanReddy]

Nice clean integration! Since scalingCtx.displayPtr holds a global reference to &display, it might be worth resetting or clearing scalingCtx.displayPtr = nullptr at the end of drawScaledPngFromBuffer (or on early return error paths) just to prevent stale pointer references if the function exits early.