fbutils

Framebuffer drawing utilities made in C. Only tested on Raspberry Pi 3B.

Commands for compiling the library

• Compile to object with PIC gcc -c -fPIC -O2 fbuffer.c pixel.c rectangle.c circle.c line.c
• Combine the object to a library gcc -shared -o libfbutils.so fbuffer.o pixel.o rectangle.o circle.o line.o

Commands for compiling and running test programs

• Compile a test program gcc -I /absolute_path_to_fbutils/src -L /absolute_path_to_fbutils/src -l:libfbutils.so -o main main.c -lm
• Run the program with an environment variable to find the linked library sudo LD_LIBRARY_PATH=/absolute_path_to_sourcefolder/fbutils/src ./main

Notice: Programs require superuser permissions by default

Tests

For example (on Raspberry Pi) compile the tests with gcc -I /home/pi/fbutils/src -L /home/pi/fbutils/src -l:libfbutils.so -o main main.c -lm List of current test programs and their functions:

• openclose function: open framebuffer and print its dimensions, closes right after
• pixel function: draw 4 cyan pixels in each corner for 4 seconds
• rectangles function: draw random unfilled and filled rectangles, listen for signals to stop the program
• circles ridiculously inefficient function: draw a huge circle with a brim
• lines function: draw lots of random lines
• ts list of touchscreen example programs to implement fbutils touchsceen library: tslib
  • button threaded drawing function: draw a button that can be pressed
  • tsbug nothing to do with framebuffers a debug tool for ts_read_mt
  • touches function: show multitouch locations

TODO

• makefile / cmake
• graphics support (cairo?)
• opengl
• website
• python

Created and maintained by Niklas Halonen