Interface ImagePreloader
- All Known Implementing Classes:
AbstractImagePreloader
,PreloaderBMP
,PreloaderEMF
,PreloaderEPS
,PreloaderGIF
,PreloaderImageIO
,PreloaderJPEG
,PreloaderRawPNG
,PreloaderTIFF
public interface ImagePreloader
This interface provides two functions: determining whether an image format is supported and if
that's the case, some minimal information (mostly the image's intrinsic size) is extracted
and returned.
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Field Summary
FieldsModifier and TypeFieldDescriptionstatic final int
Default priority for preloaders -
Method Summary
Modifier and TypeMethodDescriptionint
Returns the priority of the preloader.preloadImage
(String originalURI, Source src, ImageContext context) "Preloads" an image, i.e.
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Field Details
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DEFAULT_PRIORITY
static final int DEFAULT_PRIORITYDefault priority for preloaders- See Also:
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Method Details
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preloadImage
ImageInfo preloadImage(String originalURI, Source src, ImageContext context) throws ImageException, IOException "Preloads" an image, i.e. indentifies whether the source image is supported by this implementation and determines the image's intrinsic size and possibly some additional information. The image is usually not fully loaded at this time to conserve memory. The method returns null if the image was not identified. AnImageException
is only thrown if the image is identified but some error has happened while working on the file.- Parameters:
originalURI
- the original (unresolved) URI of the imagesrc
- a image source the image is loaded fromcontext
- the context object that provides configuration information- Returns:
- an image info object with the basic information about an image or null if the image is not supported by this implementation
- Throws:
ImageException
- if an error occurs while preloading the imageIOException
- if an I/O error occurs while preloading the image
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getPriority
int getPriority()Returns the priority of the preloader. The lower the value, the higher the preloader's priority.- Returns:
- an integer (default is 1000)
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