setPixelR method
Set the red channel of the pixel, or the index value for palette images.
Implementation
@override
void setPixelR(int x, int y, num i) {
if (numChannels < 1) {
return;
}
_pixel ??= PixelUint4.imageData(this);
_pixel!.setPosition(x, y);
_pixel!.index = i;
}