PDFImageColorModel.SoftMask

java.lang.Object
- com.inductiveautomation.rm.pdf.reader.PDFImageColorModel.SoftMask

Enclosing class:

PDFImageColorModel
```
protected static class PDFImageColorModel.SoftMask
extends java.lang.Object
```
A representation of the alpha channel. The SoftMask maintains a width, height, & bitspersample, since they do not necessarily have to be the same as the source image's. Can also contain a Matte array, which controls premultiplication of source color samples.

Field Summary

Fields
Modifier and Type Field Description

byte[] alphabits

int bitspersample

int height

float[] matte

int width

Constructor Summary

Constructors
Constructor Description

SoftMask(byte[] alpha, int w, int h, int bps, float[] marray)
Create SoftMask.

Method Summary

All Methods Instance Methods Concrete Methods
Modifier and Type	Method	Description
`float`	`getAlpha(int x, int y)`	returns the alpha value that would be mapped to the point in the source image.
`int`	`getUnnormalizedAlpha(int x, int y)`
`void`	`setSourceImageSize(int sw, int sh)`

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

Field Detail

width
```
public int width
```

height
```
public int height
```

bitspersample
```
public int bitspersample
```

alphabits
```
public byte[] alphabits
```

matte
```
public float[] matte
```

Constructor Detail

SoftMask

public SoftMask(byte[] alpha,
                int w,
                int h,
                int bps,
                float[] marray)

Create SoftMask.

Method Detail
- setSourceImageSize
```
public void setSourceImageSize(int sw,
                               int sh)
```
- getAlpha
```
public float getAlpha(int x,
                      int y)
```
  returns the alpha value that would be mapped to the point in the source image. Since the image dimensions may not match the mask dimensions, these routines find the alpha value based on the sizes of the source and destination.
- getUnnormalizedAlpha
```
public int getUnnormalizedAlpha(int x,
                                int y)
```