java.lang.Object
- org.eclipse.swt.graphics.ImageLoader

```
public class ImageLoader
extends Object
```
Instances of this class are used to load images from, and save images to, a file or stream.
Currently supported image formats are:
- BMP (Windows or OS/2 Bitmap)
- ICO (Windows Icon)
- JPEG
- GIF
- PNG
- TIFF
ImageLoaders can be used to:
- load/save single images in all formats
- load/save multiple images (GIF/ICO/TIFF)
- load/save animated GIF images
- load interlaced GIF/PNG images
- load progressive JPEG images
NOTE: ImageLoader is implemented in Java on some platforms, which has certain performance implications. Performance and memory sensitive applications may benefit from using one of the constructors provided by Image, as these are implemented natively.
See Also:

SWT Example: ImageAnalyzer, Sample code and further information

Field Summary

Fields
Modifier and Type	Field	Description
`int`	`backgroundPixel`	the background pixel for the logical screen (this corresponds to the GIF89a Background Color Index value).
`int`	`compression`	This is the compression used when saving jpeg and png files.
`ImageData[]`	`data`	the array of ImageData objects in this ImageLoader.
`int`	`logicalScreenHeight`	the height of the logical screen on which the images reside, in pixels (this corresponds to the GIF89a Logical Screen Height value)
`int`	`logicalScreenWidth`	the width of the logical screen on which the images reside, in pixels (this corresponds to the GIF89a Logical Screen Width value)
`int`	`repeatCount`	the number of times to repeat the display of a sequence of animated images (this corresponds to the commonly-used GIF application extension for "NETSCAPE 2.0 01").

Constructor Summary

Constructors
Constructor Description

ImageLoader()
Construct a new empty ImageLoader.

Method Summary

All Methods Instance Methods Concrete Methods
Modifier and Type	Method	Description
`void`	`addImageLoaderListener(ImageLoaderListener listener)`	Adds the listener to the collection of listeners who will be notified when image data is either partially or completely loaded.
`boolean`	`hasListeners()`	Returns `true` if the receiver has image loader listeners, and `false` otherwise.
`ImageData[]`	`load(InputStream stream)`	Loads an array of `ImageData` objects from the specified input stream.
`ImageData[]`	`load(String filename)`	Loads an array of `ImageData` objects from the file with the specified name.
`void`	`notifyListeners(ImageLoaderEvent event)`	Notifies all image loader listeners that an image loader event has occurred.
`void`	`removeImageLoaderListener(ImageLoaderListener listener)`	Removes the listener from the collection of listeners who will be notified when image data is either partially or completely loaded.
`void`	`save(OutputStream stream, int format)`	Saves the image data in this ImageLoader to the specified stream.
`void`	`save(String filename, int format)`	Saves the image data in this ImageLoader to a file with the specified name.

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

- Field Detail
  - data
```
public ImageData[] data
```
    the array of ImageData objects in this ImageLoader. This array is read in when the load method is called, and it is written out when the save method is called
  - logicalScreenWidth
```
public int logicalScreenWidth
```
    the width of the logical screen on which the images reside, in pixels (this corresponds to the GIF89a Logical Screen Width value)
  - logicalScreenHeight
```
public int logicalScreenHeight
```
    the height of the logical screen on which the images reside, in pixels (this corresponds to the GIF89a Logical Screen Height value)
  - backgroundPixel
```
public int backgroundPixel
```
    the background pixel for the logical screen (this corresponds to the GIF89a Background Color Index value). The default is -1 which means 'unspecified background'
  - repeatCount
```
public int repeatCount
```
    the number of times to repeat the display of a sequence of animated images (this corresponds to the commonly-used GIF application extension for "NETSCAPE 2.0 01"). The default is 1. A value of 0 means 'display repeatedly'
  - compression
```
public int compression
```
    This is the compression used when saving jpeg and png files.
    When saving jpeg files, the value is from 1 to 100, where 1 is very high compression but low quality, and 100 is no compression and high quality; default is 75.
    When saving png files, the value is from 0 to 3, but they do not impact the quality because PNG is lossless compression. 0 is uncompressed, 1 is low compression and fast, 2 is default compression, and 3 is high compression but slow.
    
    Since:
    
    3.8
- Constructor Detail
  - ImageLoader
```
public ImageLoader()
```
    Construct a new empty ImageLoader.
- Method Detail
  - load
```
public ImageData[] load(InputStream stream)
```
    Loads an array of ImageData objects from the specified input stream. Throws an error if either an error occurs while loading the images, or if the images are not of a supported type. Returns the loaded image data array.
    Parameters:
    
    stream - the input stream to load the images from
    
    Returns:
    
    an array of ImageData objects loaded from the specified input stream
    
    Throws:
    
    IllegalArgumentException -
    
    ERROR_NULL_ARGUMENT - if the stream is null
    
    SWTException -
    
    ERROR_IO - if an IO error occurs while reading from the stream
    
    ERROR_INVALID_IMAGE - if the image stream contains invalid data
    
    ERROR_UNSUPPORTED_FORMAT - if the image stream contains an unrecognized format
  - load
```
public ImageData[] load(String filename)
```
    Loads an array of ImageData objects from the file with the specified name. Throws an error if either an error occurs while loading the images, or if the images are not of a supported type. Returns the loaded image data array.
    Parameters:
    
    filename - the name of the file to load the images from
    
    Returns:
    
    an array of ImageData objects loaded from the specified file
    
    Throws:
    
    IllegalArgumentException -
    
    ERROR_NULL_ARGUMENT - if the file name is null
    
    SWTException -
    
    ERROR_IO - if an IO error occurs while reading from the file
    
    ERROR_INVALID_IMAGE - if the image file contains invalid data
    
    ERROR_UNSUPPORTED_FORMAT - if the image file contains an unrecognized format
  - save
```
public void save(OutputStream stream,
                 int format)
```
    Saves the image data in this ImageLoader to the specified stream. The format parameter can have one of the following values:
    
    IMAGE_BMP
    
    Windows BMP file format, no compression
    
    IMAGE_BMP_RLE
    
    Windows BMP file format, RLE compression if appropriate
    
    IMAGE_GIF
    
    GIF file format
    
    IMAGE_ICO
    
    Windows ICO file format
    
    IMAGE_JPEG
    
    JPEG file format
    
    IMAGE_PNG
    
    PNG file format
    Parameters:
    
    stream - the output stream to write the images to
    
    format - the format to write the images in
    
    Throws:
    
    IllegalArgumentException -
    
    ERROR_NULL_ARGUMENT - if the stream is null
    
    SWTException -
    
    ERROR_IO - if an IO error occurs while writing to the stream
    
    ERROR_INVALID_IMAGE - if the image data contains invalid data
    
    ERROR_UNSUPPORTED_FORMAT - if the image data cannot be saved to the requested format
  - save
```
public void save(String filename,
                 int format)
```
    Saves the image data in this ImageLoader to a file with the specified name. The format parameter can have one of the following values:
    
    IMAGE_BMP
    
    Windows BMP file format, no compression
    
    IMAGE_BMP_RLE
    
    Windows BMP file format, RLE compression if appropriate
    
    IMAGE_GIF
    
    GIF file format
    
    IMAGE_ICO
    
    Windows ICO file format
    
    IMAGE_JPEG
    
    JPEG file format
    
    IMAGE_PNG
    
    PNG file format
    Parameters:
    
    filename - the name of the file to write the images to
    
    format - the format to write the images in
    
    Throws:
    
    IllegalArgumentException -
    
    ERROR_NULL_ARGUMENT - if the file name is null
    
    SWTException -
    
    ERROR_IO - if an IO error occurs while writing to the file
    
    ERROR_INVALID_IMAGE - if the image data contains invalid data
    
    ERROR_UNSUPPORTED_FORMAT - if the image data cannot be saved to the requested format
  - addImageLoaderListener
```
public void addImageLoaderListener(ImageLoaderListener listener)
```
    Adds the listener to the collection of listeners who will be notified when image data is either partially or completely loaded.
    An ImageLoaderListener should be added before invoking one of the receiver's load methods. The listener's imageDataLoaded method is called when image data has been partially loaded, as is supported by interlaced GIF/PNG or progressive JPEG images.
    Parameters:
    
    listener - the listener which should be notified
    
    Throws:
    
    IllegalArgumentException -
    
    ERROR_NULL_ARGUMENT - if the listener is null
    
    See Also:
    
    ImageLoaderListener, ImageLoaderEvent
  - removeImageLoaderListener
```
public void removeImageLoaderListener(ImageLoaderListener listener)
```
    Removes the listener from the collection of listeners who will be notified when image data is either partially or completely loaded.
    Parameters:
    
    listener - the listener which should no longer be notified
    
    Throws:
    
    IllegalArgumentException -
    
    ERROR_NULL_ARGUMENT - if the listener is null
    
    See Also:
    
    addImageLoaderListener(ImageLoaderListener)
  - hasListeners
```
public boolean hasListeners()
```
    Returns true if the receiver has image loader listeners, and false otherwise.
    
    Returns:
    
    true if there are ImageLoaderListeners, and false otherwise
    
    See Also:
    
    addImageLoaderListener(ImageLoaderListener), removeImageLoaderListener(ImageLoaderListener)
  - notifyListeners
```
public void notifyListeners(ImageLoaderEvent event)
```
    Notifies all image loader listeners that an image loader event has occurred. Pass the specified event object to each listener.
    
    Parameters:
    
    event - the ImageLoaderEvent to send to each ImageLoaderListener

Class ImageLoader

Field Summary

Constructor Summary

Method Summary

Methods inherited from class java.lang.Object

Field Detail

data

logicalScreenWidth

logicalScreenHeight

backgroundPixel

repeatCount

compression

Constructor Detail

ImageLoader

Method Detail

load

load

save

save

addImageLoaderListener

removeImageLoaderListener

hasListeners

notifyListeners