What is png_test_only?

This project, called png_test_only, is a work-in-progress tool for decoding PNG image files. In simple terms, it is designed to take a PNG image and translate its compressed data into a format that can be displayed on a screen, likely within custom hardware or software projects where standard image libraries are not available or practical. The README does not go into detail about the specific technical implementation. Based on the project's description and primary language, it is built in C and likely operates as a set of experimental test programs, or "sketches," that developers can use to verify whether their custom image-reading logic works correctly on different PNG files. This would be used by someone building a custom electronic device or a lightweight application that needs to show images without relying on a heavy operating system. For example, if a hobbyist is creating a custom digital display using a microcontroller and needs that device to read and show PNG pictures stored on a memory card, they might experiment with this kind of code to handle the image decoding step. Because it is explicitly labeled as a work in progress with test sketches, it is probably not a finished, plug-and-play solution. The tradeoff is that while it might be lightweight and adaptable for specific hardware, it likely requires the person using it to understand the underlying code and integrate it into their own project manually, rather than simply downloading a finished application.