Class MaskUtil

java.lang.Object

com.google.zxing.qrcode.encoder.MaskUtil

final class MaskUtil
extends Object

Field Summary

Fields

Modifier and Type	Field	Description
private static final int	N1
private static final int	N2
private static final int	N3
private static final int	N4

Constructor Summary

Constructors

Modifier	Constructor	Description
private	MaskUtil()

Method Summary

Modifier and Type	Method	Description
(package private) static int	applyMaskPenaltyRule1(ByteMatrix matrix)	Apply mask penalty rule 1 and return the penalty.
private static int	applyMaskPenaltyRule1Internal(ByteMatrix matrix, boolean isHorizontal)	Helper function for applyMaskPenaltyRule1.
(package private) static int	applyMaskPenaltyRule2(ByteMatrix matrix)	Apply mask penalty rule 2 and return the penalty.
(package private) static int	applyMaskPenaltyRule3(ByteMatrix matrix)	Apply mask penalty rule 3 and return the penalty.
(package private) static int	applyMaskPenaltyRule4(ByteMatrix matrix)	Apply mask penalty rule 4 and return the penalty.
(package private) static boolean	getDataMaskBit(int maskPattern, int x, int y)	Return the mask bit for "getMaskPattern" at "x" and "y".
private static boolean	isWhiteHorizontal(byte[] rowArray, int from, int to)
private static boolean	isWhiteVertical(byte[][] array, int col, int from, int to)

Methods inherited from class Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Details

N1

private static final int N1

See Also:

• Constant Field Values

N2

private static final int N2

See Also:

• Constant Field Values

N3

private static final int N3

See Also:

• Constant Field Values

N4

private static final int N4

See Also:

• Constant Field Values

Constructor Details

MaskUtil

private MaskUtil()

Method Details

applyMaskPenaltyRule1

static int applyMaskPenaltyRule1(ByteMatrix matrix)

Apply mask penalty rule 1 and return the penalty. Find repetitive cells with the same color and give penalty to them. Example: 00000 or 11111.

applyMaskPenaltyRule2

static int applyMaskPenaltyRule2(ByteMatrix matrix)

Apply mask penalty rule 2 and return the penalty. Find 2x2 blocks with the same color and give penalty to them. This is actually equivalent to the spec's rule, which is to find MxN blocks and give a penalty proportional to (M-1)x(N-1), because this is the number of 2x2 blocks inside such a block.

applyMaskPenaltyRule3

static int applyMaskPenaltyRule3(ByteMatrix matrix)

Apply mask penalty rule 3 and return the penalty. Find consecutive runs of 1:1:3:1:1:4 starting with black, or 4:1:1:3:1:1 starting with white, and give penalty to them. If we find patterns like 000010111010000, we give penalty once.

isWhiteHorizontal

private static boolean isWhiteHorizontal(byte[] rowArray,
 int from,
 int to)

isWhiteVertical

private static boolean isWhiteVertical(byte[][] array,
 int col,
 int from,
 int to)

applyMaskPenaltyRule4

static int applyMaskPenaltyRule4(ByteMatrix matrix)

Apply mask penalty rule 4 and return the penalty. Calculate the ratio of dark cells and give penalty if the ratio is far from 50%. It gives 10 penalty for 5% distance.

getDataMaskBit

static boolean getDataMaskBit(int maskPattern,
 int x,
 int y)

Return the mask bit for "getMaskPattern" at "x" and "y". See 8.8 of JISX0510:2004 for mask pattern conditions.

applyMaskPenaltyRule1Internal

private static int applyMaskPenaltyRule1Internal(ByteMatrix matrix,
 boolean isHorizontal)

Helper function for applyMaskPenaltyRule1. We need this for doing this calculation in both vertical and horizontal orders respectively.