Class PreloaderGIF
- java.lang.Object
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- org.apache.xmlgraphics.image.loader.impl.AbstractImagePreloader
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- org.apache.xmlgraphics.image.loader.impl.PreloaderGIF
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- All Implemented Interfaces:
ImagePreloader
public class PreloaderGIF extends AbstractImagePreloader
Image preloader for GIF images.
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Field Summary
Fields Modifier and Type Field Description private static int
GIF_SIG_LENGTH
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Fields inherited from interface org.apache.xmlgraphics.image.loader.spi.ImagePreloader
DEFAULT_PRIORITY
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Constructor Summary
Constructors Constructor Description PreloaderGIF()
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Method Summary
All Methods Instance Methods Concrete Methods Modifier and Type Method Description private ImageSize
determineSize(byte[] header, ImageContext context, javax.imageio.stream.ImageInputStream in)
private int[]
extractImageMetadata(javax.imageio.stream.ImageInputStream in)
ImageInfo
preloadImage(java.lang.String uri, javax.xml.transform.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 Detail
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GIF_SIG_LENGTH
private static final int GIF_SIG_LENGTH
- See Also:
- Constant Field Values
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Method Detail
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preloadImage
public ImageInfo preloadImage(java.lang.String uri, javax.xml.transform.Source src, ImageContext context) throws java.io.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:
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:
java.io.IOException
- if an I/O error occurs while preloading the image
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determineSize
private ImageSize determineSize(byte[] header, ImageContext context, javax.imageio.stream.ImageInputStream in) throws java.io.IOException
- Throws:
java.io.IOException
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extractImageMetadata
private int[] extractImageMetadata(javax.imageio.stream.ImageInputStream in) throws java.io.IOException
- Throws:
java.io.IOException
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