[8378] | 1 | // License: GPL. For details, see LICENSE file.
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[2593] | 2 | package org.openstreetmap.josm.gui.layer.geoimage;
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| 3 |
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[17873] | 4 | import java.awt.Dimension;
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[2593] | 5 | import java.awt.image.BufferedImage;
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[8762] | 6 | import java.io.File;
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| 7 | import java.io.IOException;
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[17363] | 8 | import java.io.UncheckedIOException;
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[2606] | 9 | import java.util.ArrayList;
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[9277] | 10 | import java.util.Collection;
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[2593] | 11 |
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[16398] | 12 | import org.apache.commons.jcs3.access.behavior.ICacheAccess;
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[17830] | 13 | import org.apache.commons.jcs3.engine.behavior.ICache;
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[8762] | 14 | import org.openstreetmap.josm.data.cache.BufferedImageCacheEntry;
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| 15 | import org.openstreetmap.josm.data.cache.JCSCacheManager;
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[12630] | 16 | import org.openstreetmap.josm.gui.MainApplication;
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[12846] | 17 | import org.openstreetmap.josm.spi.preferences.Config;
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[12620] | 18 | import org.openstreetmap.josm.tools.Logging;
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[17873] | 19 | import org.openstreetmap.josm.tools.Stopwatch;
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[2593] | 20 |
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[12460] | 21 | /**
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| 22 | * Loads thumbnail previews for a list of images from a {@link GeoImageLayer}.
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[12620] | 23 | *
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[12460] | 24 | * Thumbnails are loaded in the background and cached on disk for the next session.
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| 25 | */
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[2593] | 26 | public class ThumbsLoader implements Runnable {
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[2986] | 27 | public static final int maxSize = 120;
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| 28 | public static final int minSize = 22;
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[8840] | 29 | public volatile boolean stop;
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[9277] | 30 | private final Collection<ImageEntry> data;
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[9078] | 31 | private final GeoImageLayer layer;
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[8836] | 32 | private ICacheAccess<String, BufferedImageCacheEntry> cache;
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[12846] | 33 | private final boolean cacheOff = Config.getPref().getBoolean("geoimage.noThumbnailCache", false);
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[2617] | 34 |
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[9277] | 35 | private ThumbsLoader(Collection<ImageEntry> data, GeoImageLayer layer) {
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| 36 | this.data = data;
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| 37 | this.layer = layer;
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| 38 | initCache();
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| 39 | }
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| 40 |
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[9270] | 41 | /**
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| 42 | * Constructs a new thumbnail loader that operates on a geoimage layer.
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| 43 | * @param layer geoimage layer
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| 44 | */
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[2986] | 45 | public ThumbsLoader(GeoImageLayer layer) {
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[14590] | 46 | this(new ArrayList<>(layer.getImageData().getImages()), layer);
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[9270] | 47 | }
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| 48 |
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| 49 | /**
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[9277] | 50 | * Constructs a new thumbnail loader that operates on the image entries
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| 51 | * @param entries image entries
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| 52 | */
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| 53 | public ThumbsLoader(Collection<ImageEntry> entries) {
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| 54 | this(entries, null);
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| 55 | }
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| 56 |
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| 57 | /**
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[9270] | 58 | * Initialize the thumbnail cache.
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| 59 | */
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| 60 | private void initCache() {
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[2986] | 61 | if (!cacheOff) {
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[13643] | 62 | cache = JCSCacheManager.getCache("geoimage-thumbnails", 0, 120,
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| 63 | Config.getDirs().getCacheDirectory(true).getPath() + File.separator + "geoimage-thumbnails");
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[2593] | 64 | }
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[2986] | 65 | }
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[2593] | 66 |
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[6084] | 67 | @Override
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[2986] | 68 | public void run() {
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[17873] | 69 | int count = 0;
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| 70 | Stopwatch stopwatch = Stopwatch.createStarted();
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| 71 | Logging.debug("Loading {0} thumbnails", data.size());
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[8905] | 72 | for (ImageEntry entry : data) {
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[2986] | 73 | if (stop) return;
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[2617] | 74 |
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[7784] | 75 | // Do not load thumbnails that were loaded before.
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[9270] | 76 | if (!entry.hasThumbnail()) {
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| 77 | entry.setThumbnail(loadThumb(entry));
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[2617] | 78 |
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[12630] | 79 | if (layer != null && MainApplication.isDisplayingMapView()) {
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[12340] | 80 | layer.updateBufferAndRepaint();
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[7784] | 81 | }
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[2986] | 82 | }
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[17873] | 83 | count++;
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[2986] | 84 | }
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[17873] | 85 | Logging.debug("Loaded {0} thumbnails in {1}", count, stopwatch);
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[9277] | 86 | if (layer != null) {
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| 87 | layer.thumbsLoaded();
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[12340] | 88 | layer.updateBufferAndRepaint();
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[9277] | 89 | }
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[2986] | 90 | }
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[2617] | 91 |
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[2986] | 92 | private BufferedImage loadThumb(ImageEntry entry) {
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[17830] | 93 | final String cacheIdent = entry.getFile().toString() + ICache.NAME_COMPONENT_DELIMITER + maxSize;
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[2617] | 94 |
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[8762] | 95 | if (!cacheOff && cache != null) {
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| 96 | try {
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| 97 | BufferedImageCacheEntry cacheEntry = cache.get(cacheIdent);
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| 98 | if (cacheEntry != null && cacheEntry.getImage() != null) {
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[17873] | 99 | Logging.debug("{0} from cache", cacheIdent);
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[8762] | 100 | return cacheEntry.getImage();
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| 101 | }
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| 102 | } catch (IOException e) {
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[12620] | 103 | Logging.warn(e);
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[2606] | 104 | }
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[2986] | 105 | }
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[2617] | 106 |
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[17873] | 107 | BufferedImage img;
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[2986] | 108 | try {
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[17873] | 109 | img = entry.read(new Dimension(maxSize, maxSize));
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| 110 | } catch (IOException e) {
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| 111 | Logging.warn("Failed to load geoimage thumb");
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| 112 | Logging.warn(e);
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[2986] | 113 | return null;
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| 114 | }
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[7956] | 115 |
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[18108] | 116 | if (img == null || img.getWidth() <= 0 || img.getHeight() <= 0) {
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[12620] | 117 | Logging.error(" Invalid image");
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[2986] | 118 | return null;
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| 119 | }
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[2617] | 120 |
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[8762] | 121 | if (!cacheOff && cache != null) {
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[17363] | 122 | try {
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[17873] | 123 | cache.put(cacheIdent, BufferedImageCacheEntry.pngEncoded(img));
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[17363] | 124 | } catch (UncheckedIOException e) {
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[12620] | 125 | Logging.warn("Failed to save geoimage thumb to cache");
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| 126 | Logging.warn(e);
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[8762] | 127 | }
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[2606] | 128 | }
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[2593] | 129 |
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[17873] | 130 | return img;
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[2593] | 131 | }
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[2986] | 132 | }
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