Simplified code for 'upward' variable in all language versions, without changing behavior.

c/qrcodegen.c

@@ -668,7 +668,7 @@ static void drawCodewords(const uint8_t data[], int dataLen, uint8_t qrcode[], i
 		for (int vert = 0; vert < size; vert++) {  // Vertical counter
 			for (int j = 0; j < 2; j++) {
 				int x = right - j;  // Actual x coordinate
-				bool upward = ((right & 2) == 0) ^ (x < 6);
+				bool upward = ((right + 1) & 2) == 0;
 				int y = upward ? size - 1 - vert : vert;  // Actual y coordinate
 				if (!getModule(qrcode, size, x, y) && i < dataLen * 8) {
 					bool black = ((data[i >> 3] >> (7 - (i & 7))) & 1) != 0;

cpp/QrCode.cpp

@@ -348,7 +348,7 @@ void qrcodegen::QrCode::drawCodewords(const std::vector<uint8_t> &data) {
 		for (int vert = 0; vert < size; vert++) {  // Vertical counter
 			for (int j = 0; j < 2; j++) {
 				int x = right - j;  // Actual x coordinate
-				bool upward = ((right & 2) == 0) ^ (x < 6);
+				bool upward = ((right + 1) & 2) == 0;
 				int y = upward ? size - 1 - vert : vert;  // Actual y coordinate
 				if (!isFunction.at(y).at(x) && i < data.size() * 8) {
 					modules.at(y).at(x) = ((data.at(i >> 3) >> (7 - (i & 7))) & 1) != 0;

java/io/nayuki/qrcodegen/QrCode.java

@@ -504,7 +504,7 @@ public final class QrCode {
 			for (int vert = 0; vert < size; vert++) {  // Vertical counter
 				for (int j = 0; j < 2; j++) {
 					int x = right - j;  // Actual x coordinate
-					boolean upward = ((right & 2) == 0) ^ (x < 6);
+					boolean upward = ((right + 1) & 2) == 0;
 					int y = upward ? size - 1 - vert : vert;  // Actual y coordinate
 					if (!isFunction[y][x] && i < data.length * 8) {
 						modules[y][x] = ((data[i >>> 3] >>> (7 - (i & 7))) & 1) != 0;

javascript/qrcodegen.js

@@ -405,7 +405,7 @@ var qrcodegen = new function() {
 				for (var vert = 0; vert < size; vert++) {  // Vertical counter
 					for (var j = 0; j < 2; j++) {
 						var x = right - j;  // Actual x coordinate
-						var upward = ((right & 2) == 0) ^ (x < 6);
+						var upward = ((right + 1) & 2) == 0;
 						var y = upward ? size - 1 - vert : vert;  // Actual y coordinate
 						if (!isFunction[y][x] && i < data.length * 8) {
 							modules[y][x] = ((data[i >>> 3] >>> (7 - (i & 7))) & 1) != 0;

python/qrcodegen.py

@@ -404,7 +404,7 @@ class QrCode(object):
 			for vert in range(self._size):  # Vertical counter
 				for j in range(2):
 					x = right - j  # Actual x coordinate
-					upward = ((right & 2) == 0) ^ (x < 6)
+					upward = ((right + 1) & 2) == 0
 					y = (self._size - 1 - vert) if upward else vert  # Actual y coordinate
 					if not self._isfunction[y][x] and i < len(data) * 8:
 						self._modules[y][x] = ((data[i >> 3] >> (7 - (i & 7))) & 1) != 0