Function getModule

modules/data/qrcode/qrcodegen.c:657–664

Gets the module at the given coordinates, which must be in bounds.

// Gets the module at the given coordinates, which must be in bounds.
testable bool getModule(const uint8_t qrcode[], int x, int y) {
	int qrsize = qrcode[0];
	assert(21 <= qrsize && qrsize <= 177 && 0 <= x && x < qrsize && 0 <= y && y < qrsize);
	int index = y * qrsize + x;
	int bitIndex = index & 7;
	int byteIndex = (index >> 3) + 1;
	return ((qrcode[byteIndex] >> bitIndex) & 1) != 0;
}


// Sets the module at the given coordinates, which must be in bounds.