50 lines
1.6 KiB
Java
50 lines
1.6 KiB
Java
package tc.oc.image;
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import java.awt.*;
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import java.awt.image.BufferedImage;
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import java.io.ByteArrayOutputStream;
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import java.io.IOException;
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import java.nio.file.Path;
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import javax.imageio.ImageIO;
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import com.google.common.base.Throwables;
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import com.google.common.collect.ImmutableMap;
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import tc.oc.net.UriUtils;
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public interface ImageUtils {
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static BufferedImage resize(BufferedImage image, int width, int height) {
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final BufferedImage resized = new BufferedImage(width, 64, image.getType());
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final Graphics2D g = resized.createGraphics();
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g.addRenderingHints(ImmutableMap.of(RenderingHints.KEY_INTERPOLATION,
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RenderingHints.VALUE_INTERPOLATION_BILINEAR));
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g.drawImage(image, 0, 0, width, height, null);
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g.dispose();
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return resized;
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}
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static byte[] png(BufferedImage image) {
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try {
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final ByteArrayOutputStream data = new ByteArrayOutputStream();
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ImageIO.write(image, "png", data);
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return data.toByteArray();
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} catch(IOException e) {
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throw Throwables.propagate(e);
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}
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}
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static byte[] thumbnail(Path path, int height) {
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try {
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final BufferedImage image = ImageIO.read(path.toFile());
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final BufferedImage thumb = resize(image, height * image.getWidth() / image.getHeight(), height);
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return png(thumb);
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} catch(IOException e) {
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throw Throwables.propagate(e);
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}
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}
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static String thumbnailUri(Path path, int height) {
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return UriUtils.dataUri("image/png", thumbnail(path, height));
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}
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}
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