MaskUtil (I2P Anonymous Network - Java Documentation - Version 1.5.0)

java.lang.Object
- com.google.zxing.qrcode.encoder.MaskUtil

```
final class MaskUtil
extends Object
```
Author:

Satoru Takabayashi, Daniel Switkin, Sean Owen

Method Summary

All Methods Static Methods Concrete Methods
Modifier and Type	Method	Description
`(package private) static int`	`applyMaskPenaltyRule1(ByteMatrix matrix)`	Apply mask penalty rule 1 and return the penalty.
`(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".

Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

- Method Detail
  - 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.
  - 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.