Accelerates text output.

[leader72]

If you replace this function in the project, the text is displayed in the 2-3 times faster. Depending on whether there is a back color.

// Draw a character
void Adafruit_GFX::drawChar(int16_t x, int16_t y, unsigned char c,
uint16_t color, uint16_t bg, uint8_t size)
{
if((x >= _width) || // Clip right
(y >= _height) || // Clip bottom
((x + 6 * size - 1) < 0) || // Clip left
((y + 8 * size - 1) < 0)) // Clip top
return;

if(!_cp437 && (c >= 176)) c++; // Handle 'classic' charset behavior
uint8_t line;
bool Fill; uint8_t SF;
for (int8_t i=0; i<6; i++, x+=size)
{
if (i == 5) line = 0x0;
else line = pgm_read_byte(font+(c*5)+i);
Fill = line & 0x1; SF = 0;
for (int8_t j = 1, jy=size; j<9; j++, jy+=size)
{
line >>= 1;
if ((Fill == (line & 0x1)) && j!=8) continue;
if (Fill) fillRect(x, y+SF, size, jy-SF, color);
else if (bg != color) fillRect(x, y+SF, size, jy-SF, bg);
Fill = line & 0x1; SF = jy;
}
}
}

Good luck!