Bisq avatar improvements

apps/desktop/desktop/src/main/java/bisq/desktop/components/cathash/BucketConfig.java

@@ -0,0 +1,75 @@
+/*
+ * This file is part of Bisq.
+ *
+ * Bisq is free software: you can redistribute it and/or modify it
+ * under the terms of the GNU Affero General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or (at
+ * your option) any later version.
+ *
+ * Bisq is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE. See the GNU Affero General Public
+ * License for more details.
+ *
+ * You should have received a copy of the GNU Affero General Public License
+ * along with Bisq. If not, see <http://www.gnu.org/licenses/>.
+ */
+
+package bisq.desktop.components.cathash;
+
+import bisq.common.util.MathUtils;
+import lombok.extern.slf4j.Slf4j;
+
+@Slf4j
+public class BucketConfig {
+    static final String DIGIT = "#";
+
+    private static final int BG0_COUNT = 16;
+    private static final int BG1_COUNT = 16;
+    private static final int EARS0_COUNT = 16;
+    private static final int EARS1_COUNT = 3;
+    private static final int FACE0_COUNT = 16;
+    private static final int FACE1_COUNT = 9;
+    private static final int EYES0_COUNT = 16;
+    private static final int NOSE0_COUNT = 6;
+    private static final int WHISKERS0_COUNT = 7;
+
+    private static final int[] BUCKET_SIZES = new int[]{BG0_COUNT, BG1_COUNT, EARS0_COUNT, EARS1_COUNT, FACE0_COUNT,
+            FACE1_COUNT, EYES0_COUNT, NOSE0_COUNT, WHISKERS0_COUNT};
+
+    private static final String[] PATH_TEMPLATES;
+
+    static {
+        String postFix = ".png";
+        PATH_TEMPLATES = new String[]{
+                "bg0/" + DIGIT + postFix,
+                "bg1/" + DIGIT + postFix,
+                "ears0/" + DIGIT + postFix,
+                "ears1/" + DIGIT + postFix,
+                "face0/" + DIGIT + postFix,
+                "face1/" + DIGIT + postFix,
+                "eyes0/" + DIGIT + postFix,
+                "nose0/" + DIGIT + postFix,
+                "whiskers0/" + DIGIT + postFix
+        };
+
+        long numCombinations = getNumCombinations();
+        log.info("Number of combinations: 2^{} = {}", MathUtils.getLog2(numCombinations), numCombinations);
+    }
+
+    static int[] getBucketSizes() {
+        return BUCKET_SIZES;
+    }
+
+    static String[] getPathTemplates() {
+        return PATH_TEMPLATES;
+    }
+
+    static long getNumCombinations() {
+        long result = 1;
+        for (int bucketSize : BUCKET_SIZES) {
+            result *= bucketSize;
+        }
+        return result;
+    }
+}

apps/desktop/desktop/src/main/java/bisq/desktop/components/cathash/BucketEncoder.java

@@ -0,0 +1,53 @@
+/*
+ * This file is part of Bisq.
+ *
+ * Bisq is free software: you can redistribute it and/or modify it
+ * under the terms of the GNU Affero General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or (at
+ * your option) any later version.
+ *
+ * Bisq is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE. See the GNU Affero General Public
+ * License for more details.
+ *
+ * You should have received a copy of the GNU Affero General Public License
+ * along with Bisq. If not, see <http://www.gnu.org/licenses/>.
+ */
+
+package bisq.desktop.components.cathash;
+
+import java.math.BigInteger;
+
+public class BucketEncoder {
+    /**
+     * @param input A BigInteger input that is to be split up deterministically in buckets according to the bucketSizes array.
+     * @return buckets
+     */
+    static int[] encode(BigInteger input, int[] bucketSizes) {
+        int currentBucket = 0;
+        int[] result = new int[bucketSizes.length];
+        while (currentBucket < bucketSizes.length) {
+            int bucketSize = bucketSizes[currentBucket];
+            BigInteger[] divisorReminder = input.divideAndRemainder(BigInteger.valueOf(bucketSize));
+            input = divisorReminder[0];
+            long reminder = divisorReminder[1].longValue();
+            result[currentBucket] = (int) Math.abs(reminder % bucketSize);
+            currentBucket++;
+        }
+        return result;
+    }
+
+    static String[] toPaths(int[] buckets, String[] pathTemplates) {
+        String[] paths = new String[buckets.length];
+        for (int facet = 0; facet < buckets.length; facet++) {
+            int bucketValue = buckets[facet];
+            paths[facet] = generatePath(pathTemplates[facet], bucketValue);
+        }
+        return paths;
+    }
+
+    private static String generatePath(String pathTemplate, int index) {
+        return pathTemplate.replaceAll(BucketConfig.DIGIT, String.format("%02d", index));
+    }
+}

apps/desktop/desktop/src/main/java/bisq/desktop/components/cathash/CatHash.java

@@ -26,11 +26,10 @@
 import java.util.concurrent.ConcurrentHashMap;
 
 // Derived from https://github.com/neuhalje/android-robohash
-// Number of combinations: 3 * 15 * 15 * 15 * 15 * 15 * 15  = 34171875 (2 ^ 25)
 @Slf4j
 public class CatHash {
+    private static final int SIZE = 300;
     private static final int MAX_CACHE_SIZE = 10000;
-    private static final HandleFactory HANDLE_FACTORY = new HandleFactory();
     private static final ConcurrentHashMap<ByteArray, Image> CACHE = new ConcurrentHashMap<>();
 
     public static Image getImage(byte[] pubKeyHash) {
@@ -45,23 +44,13 @@ private static Image getImage(ByteArray pubKeyHash, boolean useCache) {
         if (useCache && CACHE.containsKey(pubKeyHash)) {
             return CACHE.get(pubKeyHash);
         }
-        BigInteger bigInteger = new BigInteger(pubKeyHash.getBytes());
-        Configuration configuration = new Configuration();
-        VariableSizeHashing hashing = new VariableSizeHashing(configuration.getBucketSizes());
-        byte[] data = hashing.createBuckets(bigInteger);
-        Handle handle = HANDLE_FACTORY.calculateHandle(data);
-        Image image = imageForHandle(handle, configuration);
+        BigInteger input = new BigInteger(pubKeyHash.getBytes());
+        int[] buckets = BucketEncoder.encode(input, BucketConfig.getBucketSizes());
+        String[] paths = BucketEncoder.toPaths(buckets, BucketConfig.getPathTemplates());
+        Image image = ImageUtil.composeImage(paths, SIZE, SIZE);
         if (useCache && CACHE.size() < MAX_CACHE_SIZE) {
             CACHE.put(pubKeyHash, image);
         }
         return image;
     }
-
-    private static Image imageForHandle(Handle handle, Configuration configuration) {
-        long ts = System.currentTimeMillis();
-        byte[] bucketValues = handle.bucketValues();
-        String[] paths = configuration.convertToFacetParts(bucketValues);
-        log.debug("Generated paths for CatHash image in {} ms", System.currentTimeMillis() - ts); // typically <1ms
-        return ImageUtil.composeImage(paths, configuration.width(), configuration.height());
-    }
 }