Here is a list of all files with brief descriptions:

libssd1331.c
ssd1331.h
ssd1331_copy.c
ssd1331_drawLine.c
ssd1331_drawPixel.c
ssd1331_fillRect.c
ssd1331_init.c
ssd1331_invertDisplay.c
ssd1331_scroll.c
ssd1331_sleepWake.c
ssd1331_spiWrite.c