write an xbm file to the buffer

[astintzing]

Hi,

I wrote a simple method to write an xbm file to the buffer. Use it to display an image, or use it to display menu items. The "inverted" parameter could used to mark an item active.

Creating a XBM file is very easy using Gimp. Create an Image with the size of 84x48, monochrome and save or export it as a xbm file. Import the created file in your main.c/cpp with the include directive:
"#include <filename.xbm>".
Draw the image using:
drawXbm(0, 0, filename_bits, filename_width, filename_height);

Hope you find it useful!

[tdicola]

Thanks for submitting this pull request. I'm cleaning up old issues and will close this one. The library was refactored to build on top of the Adafruit_GFX library, so adding drawing code to this library doesn't make as much sense anymore. The Adafruit_GFX library also has a drawBitmap function that's very similar and can be used to draw bitmaps from flash memory to a display. Feel free to send pull requests to the Adafruit_GFX library in the future. Thanks!