@@ -34,6 +34,7 @@ class Adafruit_GFX : public Print {
// this must be defined by the subclass
virtual void drawPixel(uint16_t x, uint16_t y, uint16_t color);
+ virtual void invertDisplay(boolean i);
// these are 'generic' drawing functions, so we can share them!
virtual void drawLine(int16_t x0, int16_t y0, int16_t x1, int16_t y1,
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