FilterWriteStrategy (PNGJ 2.0.1 API)

java.lang.Object
- ar.com.hjg.pngj.FilterWriteStrategy

All Implemented Interfaces:

IFilterWriteStrategy
```
public class FilterWriteStrategy
extends Object
implements IFilterWriteStrategy
```
Manages the writer strategy for selecting the internal png predictor filter TODO: this needs work

Constructor Summary

Constructors
Constructor and Description

FilterWriteStrategy(ImageInfo imgInfo)

FilterWriteStrategy(ImageInfo imgInfo, FilterType ctype)

Constructors
Constructor and Description
`FilterWriteStrategy(ImageInfo imgInfo)`
`FilterWriteStrategy(ImageInfo imgInfo, FilterType ctype)`

Method Summary

Methods
Modifier and Type	Method and Description
`boolean`	`computesStatistics()`
`FilterType`	`preferedType(int rown)` Returns which (actual) filter is recommended to use for this row.
`void`	`reportResultsForFilter(int rown, FilterType type, byte[] rowbfilter, boolean tentative)` Reports the filtered row, so that the strategy can compute statistics.
`void`	`setPreference(double none, double sub, double up, double ave, double paeth)`
`List<FilterType>`	`shouldTest(int rown)` Returns which filter types should be tested (tried) for this row.

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

- Constructor Detail
  - FilterWriteStrategy
```
public FilterWriteStrategy(ImageInfo imgInfo,
                   FilterType ctype)
```
  - FilterWriteStrategy
```
public FilterWriteStrategy(ImageInfo imgInfo)
```
- Method Detail
  - shouldTest
```
public List<FilterType> shouldTest(int rown)
```
    Description copied from interface: IFilterWriteStrategy
    
    Returns which filter types should be tested (tried) for this row. Empty if we should not test.
    
    Specified by:
    
    shouldTest in interface IFilterWriteStrategy
  - setPreference
```
public void setPreference(double none,
                 double sub,
                 double up,
                 double ave,
                 double paeth)
```
  - computesStatistics
```
public boolean computesStatistics()
```
  - reportResultsForFilter
```
public void reportResultsForFilter(int rown,
                          FilterType type,
                          byte[] rowbfilter,
                          boolean tentative)
```
    Description copied from interface: IFilterWriteStrategy
    
    Reports the filtered row, so that the strategy can compute statistics.
    
    Specified by:
    
    reportResultsForFilter in interface IFilterWriteStrategy
    
    Parameters:
    rown - Row number
    type - To which (real) filter this result corresponds
    rowbfilter - Filtered row (first byte is filter type)
    tentative - If true, this signals that this is a test/try; if false, we confirm that this row is to be written
  - preferedType
```
public FilterType preferedType(int rown)
```
    Description copied from interface: IFilterWriteStrategy
    
    Returns which (actual) filter is recommended to use for this row.
    
    Specified by:
    
    preferedType in interface IFilterWriteStrategy
    
    Returns:
    One FilterType

Class FilterWriteStrategy

Constructor Summary

Method Summary

Methods inherited from class java.lang.Object

Constructor Detail

FilterWriteStrategy

FilterWriteStrategy

Method Detail

shouldTest

setPreference

computesStatistics

reportResultsForFilter

preferedType