How do you make a display invert?

[pierpe83]

Is the invert function available in this library?
If so, how do you call it in the code?

[mattncsu]

colorSwap(uint16_t x1, uint16_t y1, uint16_t x2, uint16_t y2, uint16_t color1, uint16_t color2)

Give it a rectangle and the colors to swap. For example, in my code I invert the top 20 pixels of the display (from black on white to white on black) like this:
gfx.colorSwap(0,0,gfx.getWidth(),20,0,1);

[stale]

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