// Embed position adjustment patterns if need be.
private static void maybeEmbedPositionAdjustmentPatterns(int version, ByteMatrix matrix)
throws WriterException {
if (version < 2) { // The patterns appear if version >= 2
return;
}
int index = version - 1;
int[] coordinates = POSITION_ADJUSTMENT_PATTERN_COORDINATE_TABLE[index];
int numCoordinates = POSITION_ADJUSTMENT_PATTERN_COORDINATE_TABLE[index].length;
for (int i = 0; i < numCoordinates; ++i) {
for (int j = 0; j < numCoordinates; ++j) {
int y = coordinates[i];
int x = coordinates[j];
if (x == -1 || y == -1) {
continue;
}
// If the cell is unset, we embed the position adjustment
// pattern here.
if (isEmpty(matrix.get(x, y))) {
// -2 is necessary since the x/y coordinates point to the
// center of the pattern,
// not the
// left top corner.
embedPositionAdjustmentPattern(x - 2, y - 2, matrix);
}
}
}
}
public int at(int k, int l) {
byte byte0 = j.get(k, l);
if (byte0 != 0 && byte0 != 1) {
throw new IllegalStateException("Bad value");
} else {
return byte0;
}
}
private static void embedTimingPatterns(ByteMatrix matrix) throws WriterException {
for (int i = 8; i < matrix.getWidth() - 8; ++i) {
int bit = (i + 1) % 2;
if (!isValidValue(matrix.get(i, 6))) {
throw new WriterException();
}
if (isEmpty(matrix.get(i, 6))) {
matrix.set(i, 6, bit);
}
if (!isValidValue(matrix.get(6, i))) {
throw new WriterException();
}
if (isEmpty(matrix.get(6, i))) {
matrix.set(6, i, bit);
}
}
}
private static void embedTimingPatterns(ByteMatrix matrix) throws WriterException {
// -8 is for skipping position detection patterns (size 7), and two horizontal/vertical
// separation patterns (size 1). Thus, 8 = 7 + 1.
for (int i = 8; i < matrix.getWidth() - 8; ++i) {
int bit = (i + 1) % 2;
// Horizontal line.
if (!isValidValue(matrix.get(i, 6))) {
throw new WriterException();
}
if (isEmpty(matrix.get(i, 6))) {
matrix.set(i, 6, bit);
}
// Vertical line.
if (!isValidValue(matrix.get(6, i))) {
throw new WriterException();
}
if (isEmpty(matrix.get(6, i))) {
matrix.set(6, i, bit);
}
}
}
private static void embedVerticalSeparationPattern(int xStart, int yStart, ByteMatrix matrix)
throws WriterException {
if (VERTICAL_SEPARATION_PATTERN[0].length != 1 || VERTICAL_SEPARATION_PATTERN.length != 7) {
throw new WriterException("Bad vertical separation pattern");
}
for (int y = 0; y < 7; ++y) {
if (!isEmpty(matrix.get(xStart, yStart + y))) {
throw new WriterException();
}
matrix.set(xStart, yStart + y, VERTICAL_SEPARATION_PATTERN[y][0]);
}
}
private static void embedHorizontalSeparationPattern(int xStart, int yStart, ByteMatrix matrix)
throws WriterException {
if (HORIZONTAL_SEPARATION_PATTERN[0].length != 8 || HORIZONTAL_SEPARATION_PATTERN.length != 1) {
throw new WriterException("Bad horizontal separation pattern");
}
for (int x = 0; x < 8; ++x) {
if (!isEmpty(matrix.get(xStart + x, yStart))) {
throw new WriterException();
}
matrix.set(xStart + x, yStart, HORIZONTAL_SEPARATION_PATTERN[0][x]);
}
}
// Embed "dataBits" using "getMaskPattern". On success, modify the matrix
// and return true.
// For debugging purposes, it skips masking process if "getMaskPattern" is
// -1.
// See 8.7 of JISX0510:2004 (p.38) for how to embed data bits.
static void embedDataBits(BitArray dataBits, int maskPattern, ByteMatrix matrix)
throws WriterException {
int bitIndex = 0;
int direction = -1;
// Start from the right bottom cell.
int x = matrix.getWidth() - 1;
int y = matrix.getHeight() - 1;
while (x > 0) {
// Skip the vertical timing pattern.
if (x == 6) {
x -= 1;
}
while (y >= 0 && y < matrix.getHeight()) {
for (int i = 0; i < 2; ++i) {
int xx = x - i;
// Skip the cell if it's not empty.
if (!isEmpty(matrix.get(xx, y))) {
continue;
}
boolean bit;
if (bitIndex < dataBits.getSize()) {
bit = dataBits.get(bitIndex);
++bitIndex;
} else {
// Padding bit. If there is no bit left, we'll fill the
// left cells with 0,
// as described
// in 8.4.9 of JISX0510:2004 (p. 24).
bit = false;
}
// Skip masking if mask_pattern is -1.
if (maskPattern != -1) {
if (MaskUtil.getDataMaskBit(maskPattern, xx, y)) {
bit = !bit;
}
}
matrix.set(xx, y, bit);
}
y += direction;
}
direction = -direction; // Reverse the direction.
y += direction;
x -= 2; // Move to the left.
}
// All bits should be consumed.
if (bitIndex != dataBits.getSize()) {
throw new WriterException("Not all bits consumed: " + bitIndex + '/' + dataBits.getSize());
}
}
private static void embedPositionDetectionPattern(int xStart, int yStart, ByteMatrix matrix)
throws WriterException {
if (POSITION_DETECTION_PATTERN[0].length != 7 || POSITION_DETECTION_PATTERN.length != 7) {
throw new WriterException("Bad position detection pattern");
}
for (int y = 0; y < 7; ++y) {
for (int x = 0; x < 7; ++x) {
if (!isEmpty(matrix.get(xStart + x, yStart + y))) {
throw new WriterException();
}
matrix.set(xStart + x, yStart + y, POSITION_DETECTION_PATTERN[y][x]);
}
}
}
private static void embedPositionAdjustmentPattern(int xStart, int yStart, ByteMatrix matrix)
throws WriterException {
if (POSITION_ADJUSTMENT_PATTERN[0].length != 5 || POSITION_ADJUSTMENT_PATTERN.length != 5) {
throw new WriterException("Bad position adjustment");
}
for (int y = 0; y < 5; ++y) {
for (int x = 0; x < 5; ++x) {
if (!isEmpty(matrix.get(xStart + x, yStart + y))) {
throw new WriterException();
}
matrix.set(xStart + x, yStart + y, POSITION_ADJUSTMENT_PATTERN[y][x]);
}
}
}
static void embedDataBits(BitArray dataBits, int maskPattern, ByteMatrix matrix)
throws WriterException {
int bitIndex = 0;
int direction = -1;
int x = matrix.getWidth() - 1;
int y = matrix.getHeight() - 1;
while (x > 0) {
if (x == 6) {
x -= 1;
}
while (y >= 0 && y < matrix.getHeight()) {
for (int i = 0; i < 2; ++i) {
int xx = x - i;
if (!isEmpty(matrix.get(xx, y))) {
continue;
}
boolean bit;
if (bitIndex < dataBits.getSize()) {
bit = dataBits.get(bitIndex);
++bitIndex;
} else {
bit = false;
}
if (maskPattern != -1) {
if (MaskUtil.getDataMaskBit(maskPattern, xx, y)) {
bit = !bit;
}
}
matrix.set(xx, y, bit);
}
y += direction;
}
direction = -direction;
y += direction;
x -= 2;
}
if (bitIndex != dataBits.getSize()) {
throw new WriterException("Not all bits consumed: " + bitIndex + '/' + dataBits.getSize());
}
}
private static void maybeEmbedPositionAdjustmentPatterns(int version, ByteMatrix matrix)
throws WriterException {
if (version < 2) {
return;
}
int index = version - 1;
int[] coordinates = POSITION_ADJUSTMENT_PATTERN_COORDINATE_TABLE[index];
int numCoordinates = POSITION_ADJUSTMENT_PATTERN_COORDINATE_TABLE[index].length;
for (int i = 0; i < numCoordinates; ++i) {
for (int j = 0; j < numCoordinates; ++j) {
int y = coordinates[i];
int x = coordinates[j];
if (x == -1 || y == -1) {
continue;
}
if (isEmpty(matrix.get(x, y))) {
embedPositionAdjustmentPattern(x - 2, y - 2, matrix);
}
}
}
}
// Note that the input matrix uses 0 == white, 1 == black, while the output matrix uses
// 0 == black, 255 == white (i.e. an 8 bit greyscale bitmap).
private static BitMatrix renderResult(QRCode code, int width, int height, int quietZone) {
ByteMatrix input = code.getMatrix();
if (input == null) {
throw new IllegalStateException();
}
int inputWidth = input.getWidth();
int inputHeight = input.getHeight();
int qrWidth = inputWidth + (quietZone << 1);
int qrHeight = inputHeight + (quietZone << 1);
int outputWidth = Math.max(width, qrWidth);
int outputHeight = Math.max(height, qrHeight);
int multiple = Math.min(outputWidth / qrWidth, outputHeight / qrHeight);
// Padding includes both the quiet zone and the extra white pixels to accommodate the requested
// dimensions. For example, if input is 25x25 the QR will be 33x33 including the quiet zone.
// If the requested size is 200x160, the multiple will be 4, for a QR of 132x132. These will
// handle all the padding from 100x100 (the actual QR) up to 200x160.
int leftPadding = (outputWidth - (inputWidth * multiple)) / 2;
int topPadding = (outputHeight - (inputHeight * multiple)) / 2;
BitMatrix output = new BitMatrix(outputWidth, outputHeight);
for (int inputY = 0, outputY = topPadding;
inputY < inputHeight;
inputY++, outputY += multiple) {
// Write the contents of this row of the barcode
for (int inputX = 0, outputX = leftPadding;
inputX < inputWidth;
inputX++, outputX += multiple) {
if (input.get(inputX, inputY) == 1) {
output.setRegion(outputX, outputY, multiple, multiple);
}
}
}
return output;
}
private static void embedDarkDotAtLeftBottomCorner(ByteMatrix matrix) throws WriterException {
if (matrix.get(8, matrix.getHeight() - 8) == 0) {
throw new WriterException();
}
matrix.set(8, matrix.getHeight() - 8, 1);
}
