public function testApplyMaskPenaltyRule4()
{
// Dark cell ratio = 0%
$matrix = new ByteMatrix(1, 1);
$matrix->set(0, 0, 0);
$this->assertEquals(100, MaskUtil::applyMaskPenaltyRule4($matrix));
// Dark cell ratio = 5%
$matrix = new ByteMatrix(2, 1);
$matrix->set(0, 0, 0);
$matrix->set(0, 0, 1);
$this->assertEquals(0, MaskUtil::applyMaskPenaltyRule4($matrix));
// Dark cell ratio = 66.67%
$matrix = new ByteMatrix(6, 1);
$matrix->set(0, 0, 0);
$matrix->set(1, 0, 1);
$matrix->set(2, 0, 1);
$matrix->set(3, 0, 1);
$matrix->set(4, 0, 1);
$matrix->set(5, 0, 0);
$this->assertEquals(30, MaskUtil::applyMaskPenaltyRule4($matrix));
}
/**
* Calculates the mask penalty for a matrix.
*
* @param ByteMatrix $matrix
* @return integer
*/
protected static function calculateMaskPenalty(ByteMatrix $matrix)
{
return MaskUtil::applyMaskPenaltyRule1($matrix) + MaskUtil::applyMaskPenaltyRule2($matrix) + MaskUtil::applyMaskPenaltyRule3($matrix) + MaskUtil::applyMaskPenaltyRule4($matrix);
}
/**
* Embeds "dataBits" using "getMaskPattern".
*
* 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.
*
* @param BitArray $dataBits
* @param integer $maskPattern
* @param ByteMatrix $matrix
* @return void
* @throws Exception\WriterException
*/
protected static function embedDataBits(BitArray $dataBits, $maskPattern, ByteMatrix $matrix)
{
$bitIndex = 0;
$direction = -1;
// Start from the right bottom cell.
$x = $matrix->getWidth() - 1;
$y = $matrix->getHeight() - 1;
while ($x > 0) {
// Skip vertical timing pattern.
if ($x === 6) {
$x--;
}
while ($y >= 0 && $y < $matrix->getHeight()) {
for ($i = 0; $i < 2; $i++) {
$xx = $x - $i;
// Skip the cell if it's not empty.
if ($matrix->get($xx, $y) !== -1) {
continue;
}
if ($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).
$bit = false;
}
// Skip masking if maskPattern is -1.
if ($maskPattern !== -1 && MaskUtil::getDataMaskBit($maskPattern, $xx, $y)) {
$bit = !$bit;
}
$matrix->set($xx, $y, $bit);
}
$y += $direction;
}
$direction = -$direction;
$y += $direction;
$x -= 2;
}
// All bits should be consumed
if ($bitIndex !== $dataBits->getSize()) {
throw new Exception\WriterException('Not all bits consumed (' . $bitIndex . ' out of ' . $dataBits->getSize() . ')');
}
}