public static void EmbedDataBits(BitVector dataBits, int maskPattern, ByteMatrix matrix) {
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;
}
int bit;
if (bitIndex < dataBits.Size()) {
bit = dataBits.At(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 = 0;
}
// Skip masking if mask_pattern is -1.
if (maskPattern != -1) {
if (MaskUtil.GetDataMaskBit(maskPattern, xx, y)) {
bit ^= 0x1;
}
}
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.Size()) {
throw new WriterException("Not all bits consumed: " + bitIndex + '/' + dataBits.Size());
}
}