adafruit/Adafruit-Thermal-Printer-Library — pull request #7 by quinkennedy (2012-10-19 16:40:04+00:00)
Title: Added support for bitmaps in RAM

I wanted to dynamically generate patterns on the Arduino to print on my thermal printer, so I added an optional flag to the printBitmap function which can be set to False in order to load bitmap data from RAM instead of from PROGMEM. When the 4th paramater is absent, it will load from PROGMEM (for backward-compatibility).