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package net.sf.basedb.thumbnails.impl; |
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import java.awt.image.BufferedImage; |
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import java.io.IOException; |
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import java.io.InputStream; |
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import java.util.Iterator; |
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|
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import javax.imageio.ImageIO; |
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import javax.imageio.ImageReader; |
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import javax.imageio.stream.ImageInputStream; |
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|
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import org.imgscalr.Scalr; |
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import org.imgscalr.Scalr.Rotation; |
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|
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import net.sf.basedb.thumbnails.Crop; |
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import net.sf.basedb.thumbnails.ImageLoader; |
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import net.sf.basedb.thumbnails.ThumbnailSize; |
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import net.sf.basedb.thumbnails.Thumbnails; |
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/** |
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Image loader that expect an image file that can be read |
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by the {@link ImageIO} implementation. Typically used for |
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PNG and JPG images. Thumbnails are scaled and returned as |
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JPG images. |
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|
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@author nicklas |
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@since 1.0 |
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*/ |
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public class NdpiImageLoader |
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implements ImageLoader |
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{ |
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private BufferedImage image; |
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public NdpiImageLoader() |
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{} |
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|
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@Override |
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public String getThumbMimeType() |
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{ |
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return "image/jpg"; |
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} |
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|
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@Override |
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public String getThumbExtension() |
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{ |
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return "jpg"; |
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} |
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|
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@Override |
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public void loadImage(InputStream in, int imageIndex) |
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throws IOException |
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{ |
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ImageInputStream iin = null; |
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ImageReader reader = null; |
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try |
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{ |
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iin = ImageIO.createImageInputStream(in); |
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Iterator<ImageReader> it = ImageIO.getImageReaders(iin); |
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if (it == null || !it.hasNext()) return; |
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|
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// We are just looking for the first reader compatible: |
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reader = it.next(); |
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reader.setInput(iin); |
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int numImages = reader.getNumImages(true); |
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boolean crop = imageIndex > 100; |
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if (crop) imageIndex -= 100; |
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if (imageIndex < 0) |
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{ |
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// In the NDPI images that we have the first image has the highest resolution |
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// The following 6 images are lower-resolution version |
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// Then there is a full-slide image and some kind of mask image |
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// We select the smallest image that have the same aspect ratio and image type as the first image |
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float aspectRatio = reader.getAspectRatio(0); |
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int width = reader.getWidth(0); |
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int imageType = reader.getRawImageType(0).getBufferedImageType(); |
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imageIndex = 0; |
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for (int index = 1; index < numImages; index++) |
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{ |
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if (Math.abs(aspectRatio-reader.getAspectRatio(index)) < 0.001 |
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&& imageType == reader.getRawImageType(0).getBufferedImageType() |
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&& width > reader.getWidth(index)) |
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{ |
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width = reader.getWidth(index); |
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imageIndex = index; |
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} |
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} |
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} |
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else if (imageIndex >= numImages) |
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{ |
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imageIndex = numImages-1; |
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} |
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image = reader.read(imageIndex); |
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} |
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catch (RuntimeException ex) |
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{ |
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ex.printStackTrace(System.out); |
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throw ex; |
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} |
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finally |
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{ |
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if (reader != null) reader.dispose(); |
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if (iin != null) iin.close(); |
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} |
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} |
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|
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@Override |
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public byte[] getThumbImage(ThumbnailSize size, Rotation rotation, Crop crop) |
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throws IOException |
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{ |
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BufferedImage tmp = crop == null ? image : crop.crop(image); |
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BufferedImage thumb = Thumbnails.scaleImage(tmp, size); |
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if (rotation != null) thumb = Scalr.rotate(thumb, rotation); |
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byte[] jpg = Thumbnails.toJpg(thumb, size.MEMORY); |
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return jpg; |
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} |
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|
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} |