Simplified a small bit of variables and logic of QrCode.getPenaltyScore() in all language versions, but in a subtly different way per language.

c/qrcodegen.c

@@ -716,9 +716,9 @@ static long getPenaltyScore(const uint8_t qrcode[]) {
 	
 	// Adjacent modules in row having same color
 	for (int y = 0; y < qrsize; y++) {
-		bool colorX = getModule(qrcode, 0, y);
-		for (int x = 1, runX = 1; x < qrsize; x++) {
-			if (getModule(qrcode, x, y) != colorX) {
+		bool colorX;
+		for (int x = 0, runX; x < qrsize; x++) {
+			if (x == 0 || getModule(qrcode, x, y) != colorX) {
 				colorX = getModule(qrcode, x, y);
 				runX = 1;
 			} else {
@@ -732,9 +732,9 @@ static long getPenaltyScore(const uint8_t qrcode[]) {
 	}
 	// Adjacent modules in column having same color
 	for (int x = 0; x < qrsize; x++) {
-		bool colorY = getModule(qrcode, x, 0);
-		for (int y = 1, runY = 1; y < qrsize; y++) {
-			if (getModule(qrcode, x, y) != colorY) {
+		bool colorY;
+		for (int y = 0, runY; y < qrsize; y++) {
+			if (y == 0 || getModule(qrcode, x, y) != colorY) {
 				colorY = getModule(qrcode, x, y);
 				runY = 1;
 			} else {

cpp/QrCode.cpp

@@ -422,9 +422,9 @@ long QrCode::getPenaltyScore() const {
 	
 	// Adjacent modules in row having same color
 	for (int y = 0; y < size; y++) {
-		bool colorX = modules.at(y).at(0);
-		for (int x = 1, runX = 1; x < size; x++) {
-			if (modules.at(y).at(x) != colorX) {
+		bool colorX;
+		for (int x = 0, runX; x < size; x++) {
+			if (x == 0 || modules.at(y).at(x) != colorX) {
 				colorX = modules.at(y).at(x);
 				runX = 1;
 			} else {
@@ -438,9 +438,9 @@ long QrCode::getPenaltyScore() const {
 	}
 	// Adjacent modules in column having same color
 	for (int x = 0; x < size; x++) {
-		bool colorY = modules.at(0).at(x);
-		for (int y = 1, runY = 1; y < size; y++) {
-			if (modules.at(y).at(x) != colorY) {
+		bool colorY;
+		for (int y = 0, runY; y < size; y++) {
+			if (y == 0 || modules.at(y).at(x) != colorY) {
 				colorY = modules.at(y).at(x);
 				runY = 1;
 			} else {

java/io/nayuki/qrcodegen/QrCode.java

@@ -579,9 +579,9 @@ public final class QrCode {
 		
 		// Adjacent modules in row having same color
 		for (int y = 0; y < size; y++) {
-			boolean colorX = modules[y][0];
-			for (int x = 1, runX = 1; x < size; x++) {
-				if (modules[y][x] != colorX) {
+			boolean colorX = false;
+			for (int x = 0, runX = 0; x < size; x++) {
+				if (x == 0 || modules[y][x] != colorX) {
 					colorX = modules[y][x];
 					runX = 1;
 				} else {
@@ -595,9 +595,9 @@ public final class QrCode {
 		}
 		// Adjacent modules in column having same color
 		for (int x = 0; x < size; x++) {
-			boolean colorY = modules[0][x];
-			for (int y = 1, runY = 1; y < size; y++) {
-				if (modules[y][x] != colorY) {
+			boolean colorY = false;
+			for (int y = 0, runY = 0; y < size; y++) {
+				if (y == 0 || modules[y][x] != colorY) {
 					colorY = modules[y][x];
 					runY = 1;
 				} else {

javascript/qrcodegen.js

@@ -455,9 +455,8 @@ var qrcodegen = new function() {
 			
 			// Adjacent modules in row having same color
 			for (var y = 0; y < size; y++) {
-				var colorX = modules[y][0];
-				for (var x = 1, runX = 1; x < size; x++) {
-					if (modules[y][x] != colorX) {
+				for (var x = 0, runX, colorX; x < size; x++) {
+					if (x == 0 || modules[y][x] != colorX) {
 						colorX = modules[y][x];
 						runX = 1;
 					} else {
@@ -471,9 +470,8 @@ var qrcodegen = new function() {
 			}
 			// Adjacent modules in column having same color
 			for (var x = 0; x < size; x++) {
-				var colorY = modules[0][x];
-				for (var y = 1, runY = 1; y < size; y++) {
-					if (modules[y][x] != colorY) {
+				for (var y = 0, runY, colorY; y < size; y++) {
+					if (y == 0 || modules[y][x] != colorY) {
 						colorY = modules[y][x];
 						runY = 1;
 					} else {

python/qrcodegen.py

@@ -436,10 +436,8 @@ class QrCode(object):
 		
 		# Adjacent modules in row having same color
 		for y in range(size):
-			colorx = modules[y][0]
-			runx = 1
-			for x in range(1, size):
-				if modules[y][x] != colorx:
+			for x in range(size):
+				if x == 0 or modules[y][x] != colorx:
 					colorx = modules[y][x]
 					runx = 1
 				else:
@@ -450,10 +448,8 @@ class QrCode(object):
 						result += 1
 		# Adjacent modules in column having same color
 		for x in range(size):
-			colory = modules[0][x]
-			runy = 1
-			for y in range(1, size):
-				if modules[y][x] != colory:
+			for y in range(size):
+				if y == 0 or modules[y][x] != colory:
 					colory = modules[y][x]
 					runy = 1
 				else: