minimal graphic library

• For color, grayscale or monochrome displays
• Designed for low throughput bus with framebuffer on the panel side (write-only). But not limited to
• Supports multiple displays (also contains simple singledisplay mode)
• proportional fonts
• overwrites text, can also overwtite entire line within the working area (canvas). no need to clean.
• default colors are ARGB 8888. You can implement any color conversion for any type of display as well as static dither for 565 panels inside pixelOut method
• contains HSV-RGB converter

usage

Please, provide:

• mgl_conf.h file
  • #define MGL_ASSERT()
  • #define MGL_SINGLEDISPLAY if you don't need multiple
  • DISPLAY_SIZE_X DISPLAY_SIZE_Y for default single display implementation
• display low level driver file (like mgldisp_color.c)
  • setZone is the command for limiting the canvas. pixels expected sequence is left->right, top->bottom. This command has hardware analog on most tft controllers, so you need to translate it to one SPI/IIC request. In case of monocrome lcd, same behavior is emulates for framebuffer.
  • pixelOut should write one pixel - one SPI/IIC transaction for most color screens
  • update is just a wrapper, it may be used for triggering local framebuffer to panel transfer in case this process is application-driven
  • for multimple displays you need to create MglDisplay struct for each
• your own fonts files
  • you can use https://www.pentacom.jp/pentacom/bitfontmaker2 for font editing. use python3 convert.py fontname.json for export to fontname.c file.
  • rearrange.py might be helpful to convert existing fonts to bitfontmaker2 format (manual tuning needed, paste array to file)

TODO

• do we really need lines and circles?
• more fonts is always better!)
• convert.py save font image