Class PreloaderJPEG
java.lang.Object
org.apache.xmlgraphics.image.loader.impl.AbstractImagePreloader
org.apache.xmlgraphics.image.loader.impl.PreloaderJPEG
- All Implemented Interfaces:
JPEGConstants
,ImagePreloader
Image preloader for JPEG images.
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Field Summary
FieldsModifier and TypeFieldDescriptionprivate static final int[]
private static final int
private static final int
private static final int
private static final int
private static final int
private static final int
private static final int
Fields inherited from interface org.apache.xmlgraphics.image.loader.spi.ImagePreloader
DEFAULT_PRIORITY
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Constructor Summary
Constructors -
Method Summary
Modifier and TypeMethodDescriptionprivate ImageSize
determineSize
(ImageInputStream in, ImageContext context) preloadImage
(String uri, Source src, ImageContext context) "Preloads" an image, i.e.Methods inherited from class org.apache.xmlgraphics.image.loader.impl.AbstractImagePreloader
getHeader, getPriority
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Field Details
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JPG_SIG_LENGTH
private static final int JPG_SIG_LENGTH- See Also:
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BYTES_PER_COMPONENT
private static final int[] BYTES_PER_COMPONENT -
EXIF
private static final int EXIF- See Also:
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II
private static final int II- See Also:
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MM
private static final int MM- See Also:
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X_RESOLUTION
private static final int X_RESOLUTION- See Also:
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Y_RESOLUTION
private static final int Y_RESOLUTION- See Also:
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RESOLUTION_UNIT
private static final int RESOLUTION_UNIT- See Also:
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Constructor Details
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PreloaderJPEG
public PreloaderJPEG()
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Method Details
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preloadImage
public ImageInfo preloadImage(String uri, Source src, ImageContext context) throws IOException, ImageException "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.- Specified by:
preloadImage
in interfaceImagePreloader
- Parameters:
uri
- 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
IOException
- if an I/O error occurs while preloading the image
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determineSize
private ImageSize determineSize(ImageInputStream in, ImageContext context) throws IOException, ImageException - Throws:
IOException
ImageException
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