gfx | device independent graphics

gfx is a C library typically used in Internet of Things (IoT), Arduino applications. gfx has no bugs, it has no vulnerabilities, it has a Permissive License and it has low support. You can download it from GitHub.

I wanted a graphics library that was faster and better than what I had found for various IoT devices. The most popular is probably Adafruit_GFX, but it's not optimal. It's very minimalistic, not very optimized, and doesn't have a fully decoupled driver interface. Also, being tied to the Arduino framework, it can't take advantage of platform specific features that increase performance, like being able to switch between interrupt and polling based SPI transactions on the ESP32. GFX on the other hand, isn't tied to anything. It can draw anywhere, on any platform. It's basically standard C++, and things like line drawing and font drawing algorithms. Without a driver, it can only draw to in memory bitmaps, but once you add a driver to the mix, you can draw directly onto displays the same way you do to bitmaps. Disclaimer: The documentation that ships with the downloaded code is always at least one iteration out of date compared to this article, and compared to what's on github. That shouldn't matter, since this article is the documentation so if you got it from here, you're hip to the latest. However, if this bugs you, get it from Github instead. Unfortunately, it's just a lot more work for me to sync everything back and then repackage and reupload to make it in sync. Update: Some minor bugfixes, SPI drivers are refactored to use a common base, more drivers are now added, and one click configuration for generic ESP32 boards is now available. Update 2: Included support for the LilyGo TTGO board, as well as the green tab 128x128 1.44" ST7735 display (though other green tab models may work too they have not been tested). Update 3: Added transparent_color argument to draw::bitmap<>() so you can do sprites. Update 4: GFX draw::rectangle<>() bugfix and added experimental MAX7219 driver. Update 5: Bug fixes with bitmap drawing. Update 6: Fixed some of the demos that were failing the build.