Move blurhash to its own module.

app/build.gradle.kts

@@ -532,6 +532,7 @@ dependencies {
   implementation(project(":lib:qr"))
   implementation(project(":lib:sticky-header-grid"))
   implementation(project(":lib:photoview"))
+  implementation(project(":lib:blurhash"))
   implementation(project(":core:ui"))
   implementation(project(":core:models"))
   implementation(project(":core:models-jvm"))

app/src/androidTest/java/org/thoughtcrime/securesms/database/UriAttachmentBuilder.kt

@@ -1,10 +1,10 @@
 package org.thoughtcrime.securesms.database
 
 import android.net.Uri
+import org.signal.blurhash.BlurHash
 import org.signal.core.models.media.TransformProperties
 import org.thoughtcrime.securesms.attachments.UriAttachment
 import org.thoughtcrime.securesms.audio.AudioHash
-import org.thoughtcrime.securesms.blurhash.BlurHash
 import org.thoughtcrime.securesms.stickers.StickerLocator
 import java.util.UUID
 

app/src/main/java/org/thoughtcrime/securesms/attachments/ArchivedAttachment.kt

@@ -7,8 +7,8 @@ package org.thoughtcrime.securesms.attachments
 
 import android.net.Uri
 import android.os.Parcel
+import org.signal.blurhash.BlurHash
 import org.signal.core.util.Base64
-import org.thoughtcrime.securesms.blurhash.BlurHash
 import org.thoughtcrime.securesms.database.AttachmentTable
 import org.thoughtcrime.securesms.stickers.StickerLocator
 import java.util.UUID

app/src/main/java/org/thoughtcrime/securesms/attachments/Attachment.kt

@@ -8,10 +8,10 @@ import android.net.Uri
 import android.os.Parcel
 import android.os.Parcelable
 import androidx.core.os.ParcelCompat
+import org.signal.blurhash.BlurHash
 import org.signal.core.models.media.TransformProperties
 import org.signal.core.util.UuidUtil
 import org.thoughtcrime.securesms.audio.AudioHash
-import org.thoughtcrime.securesms.blurhash.BlurHash
 import org.thoughtcrime.securesms.database.AttachmentTable
 import org.thoughtcrime.securesms.stickers.StickerLocator
 import org.thoughtcrime.securesms.util.ParcelUtil

app/src/main/java/org/thoughtcrime/securesms/attachments/AttachmentUploadUtil.kt

@@ -7,10 +7,10 @@ package org.thoughtcrime.securesms.attachments
 
 import android.content.Context
 import android.graphics.Bitmap
+import org.signal.blurhash.BlurHashEncoder
 import org.signal.core.util.logging.Log
 import org.signal.core.util.mebiBytes
 import org.signal.protos.resumableuploads.ResumableUpload
-import org.thoughtcrime.securesms.blurhash.BlurHashEncoder
 import org.thoughtcrime.securesms.mms.PartAuthority
 import org.thoughtcrime.securesms.util.MediaUtil
 import org.whispersystems.signalservice.api.messages.SignalServiceAttachment

app/src/main/java/org/thoughtcrime/securesms/attachments/DatabaseAttachment.kt

@@ -3,9 +3,9 @@ package org.thoughtcrime.securesms.attachments
 import android.net.Uri
 import android.os.Parcel
 import androidx.core.os.ParcelCompat
+import org.signal.blurhash.BlurHash
 import org.signal.core.models.media.TransformProperties
 import org.thoughtcrime.securesms.audio.AudioHash
-import org.thoughtcrime.securesms.blurhash.BlurHash
 import org.thoughtcrime.securesms.database.AttachmentTable
 import org.thoughtcrime.securesms.mms.PartAuthority
 import org.thoughtcrime.securesms.stickers.StickerLocator

app/src/main/java/org/thoughtcrime/securesms/attachments/PointerAttachment.kt

@@ -3,8 +3,8 @@ package org.thoughtcrime.securesms.attachments
 import android.net.Uri
 import android.os.Parcel
 import androidx.annotation.VisibleForTesting
+import org.signal.blurhash.BlurHash
 import org.signal.core.util.Base64
-import org.thoughtcrime.securesms.blurhash.BlurHash
 import org.thoughtcrime.securesms.database.AttachmentTable
 import org.thoughtcrime.securesms.stickers.StickerLocator
 import org.whispersystems.signalservice.api.InvalidMessageStructureException

app/src/main/java/org/thoughtcrime/securesms/attachments/TombstoneAttachment.kt

@@ -2,7 +2,7 @@ package org.thoughtcrime.securesms.attachments
 
 import android.net.Uri
 import android.os.Parcel
-import org.thoughtcrime.securesms.blurhash.BlurHash
+import org.signal.blurhash.BlurHash
 import org.thoughtcrime.securesms.database.AttachmentTable
 import org.thoughtcrime.securesms.stickers.StickerLocator
 import org.thoughtcrime.securesms.util.MediaUtil

app/src/main/java/org/thoughtcrime/securesms/attachments/UriAttachment.kt

@@ -3,9 +3,9 @@ package org.thoughtcrime.securesms.attachments
 import android.net.Uri
 import android.os.Parcel
 import androidx.core.os.ParcelCompat
+import org.signal.blurhash.BlurHash
 import org.signal.core.models.media.TransformProperties
 import org.thoughtcrime.securesms.audio.AudioHash
-import org.thoughtcrime.securesms.blurhash.BlurHash
 import org.thoughtcrime.securesms.stickers.StickerLocator
 import java.util.Objects
 import java.util.UUID

app/src/main/java/org/thoughtcrime/securesms/blurhash/BlurHash.java

@@ -1,72 +0,0 @@
-package org.thoughtcrime.securesms.blurhash;
-
-import android.os.Parcel;
-import android.os.Parcelable;
-
-import androidx.annotation.NonNull;
-import androidx.annotation.Nullable;
-
-import java.util.Objects;
-
-/**
- * A BlurHash is a compact string representation of a blurred image that we can use to show fast
- * image previews.
- */
-public class BlurHash implements Parcelable {
-
-  private final String hash;
-
-  private BlurHash(@NonNull String hash) {
-    this.hash = hash;
-  }
-
-  protected BlurHash(Parcel in) {
-    hash = in.readString();
-  }
-
-  @Override
-  public void writeToParcel(Parcel dest, int flags) {
-    dest.writeString(hash);
-  }
-
-  @Override
-  public int describeContents() {
-    return 0;
-  }
-
-  public static @Nullable BlurHash parseOrNull(@Nullable String hash) {
-    if (Base83.isValid(hash)) {
-      return new BlurHash(hash);
-    }
-    return null;
-  }
-
-  public @NonNull String getHash() {
-    return hash;
-  }
-
-  @Override
-  public boolean equals(Object o) {
-    if (this == o) return true;
-    if (o == null || getClass() != o.getClass()) return false;
-    BlurHash blurHash = (BlurHash) o;
-    return Objects.equals(hash, blurHash.hash);
-  }
-
-  @Override
-  public int hashCode() {
-    return Objects.hash(hash);
-  }
-
-  public static final Creator<BlurHash> CREATOR = new Creator<BlurHash>() {
-    @Override
-    public BlurHash createFromParcel(Parcel in) {
-      return new BlurHash(in);
-    }
-
-    @Override
-    public BlurHash[] newArray(int size) {
-      return new BlurHash[size];
-    }
-  };
-}

app/src/main/java/org/thoughtcrime/securesms/blurhash/BlurHashUtil.java

@@ -1,62 +0,0 @@
-/**
- * Source: https://github.com/hsch/blurhash-java
- *
- * Copyright (c) 2019 Hendrik Schnepel
- *
- * Permission is hereby granted, free of charge, to any person obtaining a copy of this software and
- * associated documentation files (the "Software"), to deal in the Software without restriction,
- * including without limitation the rights to use, copy, modify, merge, publish, distribute,
- * sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is
- * furnished to do so, subject to the following conditions:
- *
- * The above copyright notice and this permission notice shall be included in all copies or
- * substantial portions of the Software.
- *
- * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT
- * NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
- * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,
- * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
- * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
- */
-package org.thoughtcrime.securesms.blurhash;
-
-final class BlurHashUtil {
-
-  static double sRGBToLinear(long value) {
-    double v = value / 255.0;
-    if (v <= 0.04045) {
-      return v / 12.92;
-    } else {
-      return Math.pow((v + 0.055) / 1.055, 2.4);
-    }
-  }
-
-  static long linearTosRGB(double value) {
-    double v = Math.max(0, Math.min(1, value));
-    if (v <= 0.0031308) {
-      return (long)(v * 12.92 * 255 + 0.5);
-    } else {
-      return (long)((1.055 * Math.pow(v, 1 / 2.4) - 0.055) * 255 + 0.5);
-    }
-  }
-
-  static double signPow(double val, double exp) {
-    return Math.copySign(Math.pow(Math.abs(val), exp), val);
-  }
-
-  static double max(double[][] values, int from, int endExclusive) {
-    double result = Double.NEGATIVE_INFINITY;
-    for (int i = from; i < endExclusive; i++) {
-      for (int j = 0; j < values[i].length; j++) {
-        double value = values[i][j];
-        if (value > result) {
-          result = value;
-        }
-      }
-    }
-    return result;
-  }
-
-  private BlurHashUtil() {
-  }
-}

app/src/main/java/org/thoughtcrime/securesms/components/ThumbnailView.java

@@ -38,17 +38,17 @@ import com.bumptech.glide.request.RequestOptions;
 import org.signal.core.util.concurrent.ListenableFuture;
 import org.signal.core.util.concurrent.SettableFuture;
 import org.signal.core.util.logging.Log;
+import org.signal.blurhash.BlurHash;
+import org.signal.glide.decryptableuri.DecryptableUri;
 import org.signal.glide.load.SignalDownsampleStrategy;
 import org.thoughtcrime.securesms.R;
 import org.thoughtcrime.securesms.attachments.Attachment;
 import org.thoughtcrime.securesms.attachments.DatabaseAttachment;
-import org.thoughtcrime.securesms.blurhash.BlurHash;
 import org.thoughtcrime.securesms.components.transfercontrols.TransferControlView;
 import org.thoughtcrime.securesms.database.AttachmentTable;
 import org.thoughtcrime.securesms.glide.targets.GlideBitmapListeningTarget;
 import org.thoughtcrime.securesms.glide.targets.GlideDrawableListeningTarget;
 import org.thoughtcrime.securesms.keyvalue.SignalStore;
-import org.signal.glide.decryptableuri.DecryptableUri;
 import org.thoughtcrime.securesms.mms.ImageSlide;
 import org.thoughtcrime.securesms.mms.PartAuthority;
 import org.thoughtcrime.securesms.mms.Slide;

app/src/main/java/org/thoughtcrime/securesms/database/AttachmentTable.kt

@@ -28,6 +28,7 @@ import com.bumptech.glide.Glide
 import okio.ByteString.Companion.toByteString
 import org.json.JSONArray
 import org.json.JSONException
+import org.signal.blurhash.BlurHash
 import org.signal.core.models.backup.MediaId
 import org.signal.core.models.backup.MediaName
 import org.signal.core.models.media.TransformProperties
@@ -77,7 +78,6 @@ import org.thoughtcrime.securesms.audio.AudioHash
 import org.thoughtcrime.securesms.backup.v2.ArchivedMediaObject
 import org.thoughtcrime.securesms.backup.v2.exporters.ChatItemArchiveExporter
 import org.thoughtcrime.securesms.backup.v2.proto.BackupDebugInfo
-import org.thoughtcrime.securesms.blurhash.BlurHash
 import org.thoughtcrime.securesms.crypto.AttachmentSecret
 import org.thoughtcrime.securesms.crypto.ClassicDecryptingPartInputStream
 import org.thoughtcrime.securesms.crypto.ModernDecryptingPartInputStream

app/src/main/java/org/thoughtcrime/securesms/glide/SignalGlideComponents.java

@@ -16,14 +16,14 @@ import com.bumptech.glide.load.resource.gif.ByteBufferGifDecoder;
 import com.bumptech.glide.load.resource.gif.GifDrawable;
 import com.bumptech.glide.load.resource.gif.StreamGifDecoder;
 
+import org.signal.blurhash.BlurHash;
+import org.signal.glide.blurhash.BlurHashModelLoader;
+import org.signal.glide.blurhash.BlurHashResourceDecoder;
 import org.signal.glide.common.io.InputStreamFactory;
 import org.signal.glide.load.resource.apng.decode.APNGDecoder;
 import org.thoughtcrime.securesms.badges.load.BadgeLoader;
 import org.thoughtcrime.securesms.badges.load.GiftBadgeModel;
 import org.thoughtcrime.securesms.badges.models.Badge;
-import org.thoughtcrime.securesms.blurhash.BlurHash;
-import org.thoughtcrime.securesms.blurhash.BlurHashModelLoader;
-import org.thoughtcrime.securesms.blurhash.BlurHashResourceDecoder;
 import org.thoughtcrime.securesms.contacts.avatars.ContactPhoto;
 import org.thoughtcrime.securesms.contacts.avatars.ContactPhotoLoader;
 import org.thoughtcrime.securesms.crypto.AttachmentSecret;

app/src/main/java/org/thoughtcrime/securesms/jobs/PushSendJob.java

@@ -21,11 +21,11 @@ import org.signal.libsignal.metadata.certificate.InvalidCertificateException;
 import org.signal.libsignal.metadata.certificate.SenderCertificate;
 import org.signal.libsignal.zkgroup.InvalidInputException;
 import org.signal.libsignal.zkgroup.receipts.ReceiptCredentialPresentation;
+import org.signal.blurhash.BlurHash;
 import org.thoughtcrime.securesms.TextSecureExpiredException;
 import org.thoughtcrime.securesms.attachments.Attachment;
 import org.thoughtcrime.securesms.attachments.AttachmentId;
 import org.thoughtcrime.securesms.attachments.DatabaseAttachment;
-import org.thoughtcrime.securesms.blurhash.BlurHash;
 import org.thoughtcrime.securesms.contactshare.Contact;
 import org.thoughtcrime.securesms.contactshare.ContactModelMapper;
 import org.thoughtcrime.securesms.crypto.ProfileKeyUtil;

app/src/main/java/org/thoughtcrime/securesms/mms/ImageSlide.java

@@ -24,11 +24,11 @@ import androidx.annotation.DrawableRes;
 import androidx.annotation.NonNull;
 import androidx.annotation.Nullable;
 
+import org.signal.blurhash.BlurHash;
+import org.signal.core.models.media.TransformProperties;
 import org.signal.core.util.logging.Log;
 import org.thoughtcrime.securesms.R;
 import org.thoughtcrime.securesms.attachments.Attachment;
-import org.thoughtcrime.securesms.blurhash.BlurHash;
-import org.signal.core.models.media.TransformProperties;
 import org.thoughtcrime.securesms.util.MediaUtil;
 
 public class ImageSlide extends Slide {

app/src/main/java/org/thoughtcrime/securesms/mms/Slide.java

@@ -25,11 +25,11 @@ import androidx.annotation.DrawableRes;
 import androidx.annotation.NonNull;
 import androidx.annotation.Nullable;
 
+import org.signal.blurhash.BlurHash;
+import org.signal.core.models.media.TransformProperties;
 import org.thoughtcrime.securesms.attachments.Attachment;
 import org.thoughtcrime.securesms.attachments.UriAttachment;
 import org.thoughtcrime.securesms.audio.AudioHash;
-import org.thoughtcrime.securesms.blurhash.BlurHash;
-import org.signal.core.models.media.TransformProperties;
 import org.thoughtcrime.securesms.database.AttachmentTable;
 import org.thoughtcrime.securesms.stickers.StickerLocator;
 import org.thoughtcrime.securesms.util.MediaUtil;

app/src/main/java/org/thoughtcrime/securesms/mms/SlideFactory.java

@@ -10,14 +10,12 @@ import kotlin.Pair;
 import androidx.annotation.NonNull;
 import androidx.annotation.Nullable;
 
-import org.signal.core.util.logging.Log;
-import org.thoughtcrime.securesms.blurhash.BlurHash;
+import org.signal.blurhash.BlurHash;
 import org.signal.core.models.media.TransformProperties;
-import org.thoughtcrime.securesms.database.AttachmentTable;
+import org.signal.core.util.logging.Log;
 import org.thoughtcrime.securesms.util.MediaUtil;
 
 import java.io.IOException;
-import java.util.Optional;
 
 /**
  * SlideFactory encapsulates logic related to constructing slides from a set of paramaeters as defined

app/src/main/java/org/thoughtcrime/securesms/stories/StoryFirstTimeNavigationView.kt

@@ -17,8 +17,8 @@ import com.bumptech.glide.load.DataSource
 import com.bumptech.glide.load.engine.GlideException
 import com.bumptech.glide.request.RequestListener
 import com.bumptech.glide.request.target.Target
+import org.signal.blurhash.BlurHash
 import org.thoughtcrime.securesms.R
-import org.thoughtcrime.securesms.blurhash.BlurHash
 import org.thoughtcrime.securesms.util.ContextUtil
 import org.thoughtcrime.securesms.util.visible
 

app/src/main/java/org/thoughtcrime/securesms/stories/StorySlateView.kt

@@ -9,9 +9,9 @@ import android.widget.FrameLayout
 import android.widget.ImageView
 import android.widget.TextView
 import com.bumptech.glide.Glide
+import org.signal.blurhash.BlurHash
 import org.signal.core.util.getParcelableCompat
 import org.thoughtcrime.securesms.R
-import org.thoughtcrime.securesms.blurhash.BlurHash
 import org.thoughtcrime.securesms.dependencies.AppDependencies
 import org.thoughtcrime.securesms.jobmanager.impl.NetworkConstraint
 import org.thoughtcrime.securesms.recipients.Recipient

app/src/main/java/org/thoughtcrime/securesms/stories/StoryViewerArgs.kt

@@ -3,7 +3,7 @@ package org.thoughtcrime.securesms.stories
 import android.net.Uri
 import android.os.Parcelable
 import kotlinx.parcelize.Parcelize
-import org.thoughtcrime.securesms.blurhash.BlurHash
+import org.signal.blurhash.BlurHash
 import org.thoughtcrime.securesms.recipients.RecipientId
 
 /**

app/src/main/java/org/thoughtcrime/securesms/stories/viewer/StoryViewerState.kt

@@ -1,7 +1,7 @@
 package org.thoughtcrime.securesms.stories.viewer
 
 import android.net.Uri
-import org.thoughtcrime.securesms.blurhash.BlurHash
+import org.signal.blurhash.BlurHash
 import org.thoughtcrime.securesms.database.model.MmsMessageRecord
 import org.thoughtcrime.securesms.recipients.RecipientId
 import org.thoughtcrime.securesms.stories.StoryTextPostModel

app/src/main/java/org/thoughtcrime/securesms/stories/viewer/post/StoryBlurLoader.kt

@@ -11,8 +11,8 @@ import com.bumptech.glide.load.DataSource
 import com.bumptech.glide.load.engine.GlideException
 import com.bumptech.glide.request.RequestListener
 import com.bumptech.glide.request.target.Target
+import org.signal.blurhash.BlurHash
 import org.signal.core.util.logging.Log
-import org.thoughtcrime.securesms.blurhash.BlurHash
 import org.thoughtcrime.securesms.stories.viewer.page.StoryCache
 import org.thoughtcrime.securesms.stories.viewer.page.StoryDisplay
 

app/src/main/java/org/thoughtcrime/securesms/stories/viewer/post/StoryPostState.kt

@@ -2,7 +2,7 @@ package org.thoughtcrime.securesms.stories.viewer.post
 
 import android.graphics.Typeface
 import android.net.Uri
-import org.thoughtcrime.securesms.blurhash.BlurHash
+import org.signal.blurhash.BlurHash
 import org.thoughtcrime.securesms.database.model.databaseprotos.BodyRangeList
 import org.thoughtcrime.securesms.database.model.databaseprotos.StoryTextPost
 import org.thoughtcrime.securesms.linkpreview.LinkPreview

app/src/main/java/org/thoughtcrime/securesms/stories/viewer/reply/StoriesSharedElementCrossFaderView.kt

@@ -12,11 +12,11 @@ import com.bumptech.glide.load.engine.GlideException
 import com.bumptech.glide.request.RequestListener
 import com.bumptech.glide.request.target.Target
 import com.google.android.material.card.MaterialCardView
+import org.signal.blurhash.BlurHash
 import org.signal.core.util.DimensionUnit
 import org.signal.glide.decryptableuri.DecryptableUri
 import org.thoughtcrime.securesms.R
 import org.thoughtcrime.securesms.animation.transitions.CrossfaderTransition
-import org.thoughtcrime.securesms.blurhash.BlurHash
 import org.thoughtcrime.securesms.database.model.MmsMessageRecord
 import org.thoughtcrime.securesms.stories.StoryTextPostModel
 import kotlin.reflect.KProperty

app/src/test/java/org/thoughtcrime/securesms/stories/StoryFirstTimeNavigationViewTest.kt

@@ -22,8 +22,8 @@ import org.junit.runner.RunWith
 import org.robolectric.RobolectricTestRunner
 import org.robolectric.Shadows.shadowOf
 import org.robolectric.annotation.Config
+import org.signal.blurhash.BlurHash
 import org.thoughtcrime.securesms.R
-import org.thoughtcrime.securesms.blurhash.BlurHash
 import org.thoughtcrime.securesms.util.visible
 
 @RunWith(RobolectricTestRunner::class)

app/src/test/java/org/thoughtcrime/securesms/testutil/UriAttachmentBuilder.kt

@@ -1,10 +1,10 @@
 package org.thoughtcrime.securesms.testutil
 
 import android.net.Uri
+import org.signal.blurhash.BlurHash
 import org.signal.core.models.media.TransformProperties
 import org.thoughtcrime.securesms.attachments.UriAttachment
 import org.thoughtcrime.securesms.audio.AudioHash
-import org.thoughtcrime.securesms.blurhash.BlurHash
 import org.thoughtcrime.securesms.database.AttachmentTable
 import org.thoughtcrime.securesms.stickers.StickerLocator
 

app/src/testShared/org/thoughtcrime/securesms/database/FakeMessageRecords.kt

@@ -1,11 +1,11 @@
 package org.thoughtcrime.securesms.database
 
+import org.signal.blurhash.BlurHash
 import org.signal.core.models.media.TransformProperties
 import org.thoughtcrime.securesms.attachments.AttachmentId
 import org.thoughtcrime.securesms.attachments.Cdn
 import org.thoughtcrime.securesms.attachments.DatabaseAttachment
 import org.thoughtcrime.securesms.audio.AudioHash
-import org.thoughtcrime.securesms.blurhash.BlurHash
 import org.thoughtcrime.securesms.contactshare.Contact
 import org.thoughtcrime.securesms.database.documents.IdentityKeyMismatch
 import org.thoughtcrime.securesms.database.documents.NetworkFailure

lib/blurhash/build.gradle.kts

@@ -0,0 +1,8 @@
+plugins {
+  id("signal-library")
+  id("kotlin-parcelize")
+}
+
+android {
+  namespace = "org.signal.blurhash"
+}

lib/blurhash/src/main/AndroidManifest.xml

@@ -0,0 +1,5 @@
+<?xml version="1.0" encoding="utf-8"?>
+<manifest
+    xmlns:android="http://schemas.android.com/apk/res/android">
+
+</manifest>

lib/blurhash/src/main/java/org/signal/blurhash/Base83.java

@@ -18,7 +18,7 @@
  * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
  * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  */
-package org.thoughtcrime.securesms.blurhash;
+package org.signal.blurhash;
 
 import androidx.annotation.Nullable;
 

lib/blurhash/src/main/java/org/signal/blurhash/BlurHash.kt

@@ -0,0 +1,20 @@
+package org.signal.blurhash
+
+import android.os.Parcelable
+import kotlinx.parcelize.Parcelize
+
+/**
+ * A BlurHash is a compact string representation of a blurred image that we can use to show fast
+ * image previews.
+ */
+@Parcelize
+data class BlurHash(val hash: String) : Parcelable {
+  companion object {
+    fun parseOrNull(hash: String?): BlurHash? {
+      if (Base83.isValid(hash)) {
+        return BlurHash(hash!!)
+      }
+      return null
+    }
+  }
+}

lib/blurhash/src/main/java/org/signal/blurhash/BlurHashDecoder.java

@@ -18,20 +18,20 @@
  * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
  * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  */
-package org.thoughtcrime.securesms.blurhash;
+package org.signal.blurhash;
 
 import android.graphics.Bitmap;
 import android.graphics.Color;
 
 import androidx.annotation.Nullable;
 
-import static org.thoughtcrime.securesms.blurhash.BlurHashUtil.linearTosRGB;
-import static org.thoughtcrime.securesms.blurhash.BlurHashUtil.sRGBToLinear;
-import static org.thoughtcrime.securesms.blurhash.BlurHashUtil.signPow;
+import static org.signal.blurhash.BlurHashUtil.linearTosRGB;
+import static org.signal.blurhash.BlurHashUtil.sRGBToLinear;
+import static org.signal.blurhash.BlurHashUtil.signPow;
 
-class BlurHashDecoder {
+public class BlurHashDecoder {
 
-  static @Nullable Bitmap decode(@Nullable String blurHash, int width, int height) {
+  public static @Nullable Bitmap decode(@Nullable String blurHash, int width, int height) {
     return decode(blurHash, width, height, 1f);
   }
 

lib/blurhash/src/main/java/org/signal/blurhash/BlurHashEncoder.java

@@ -19,7 +19,7 @@
  * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  */
 
-package org.thoughtcrime.securesms.blurhash;
+package org.signal.blurhash;
 
 import android.graphics.Bitmap;
 import android.graphics.BitmapFactory;
@@ -29,10 +29,10 @@ import androidx.annotation.Nullable;
 
 import java.io.InputStream;
 
-import static org.thoughtcrime.securesms.blurhash.BlurHashUtil.linearTosRGB;
-import static org.thoughtcrime.securesms.blurhash.BlurHashUtil.max;
-import static org.thoughtcrime.securesms.blurhash.BlurHashUtil.sRGBToLinear;
-import static org.thoughtcrime.securesms.blurhash.BlurHashUtil.signPow;
+import static org.signal.blurhash.BlurHashUtil.linearTosRGB;
+import static org.signal.blurhash.BlurHashUtil.max;
+import static org.signal.blurhash.BlurHashUtil.sRGBToLinear;
+import static org.signal.blurhash.BlurHashUtil.signPow;
 
 public final class BlurHashEncoder {
 

lib/blurhash/src/main/java/org/signal/blurhash/BlurHashUtil.java

@@ -0,0 +1,46 @@
+/*
+ * Copyright 2026 Signal Messenger, LLC
+ * SPDX-License-Identifier: AGPL-3.0-only
+ */
+package org.signal.blurhash;
+
+final class BlurHashUtil {
+
+  static double sRGBToLinear(long value) {
+    double v = value / 255.0;
+    if (v <= 0.04045) {
+      return v / 12.92;
+    } else {
+      return Math.pow((v + 0.055) / 1.055, 2.4);
+    }
+  }
+
+  static long linearTosRGB(double value) {
+    double v = Math.max(0, Math.min(1, value));
+    if (v <= 0.0031308) {
+      return (long)(v * 12.92 * 255 + 0.5);
+    } else {
+      return (long)((1.055 * Math.pow(v, 1 / 2.4) - 0.055) * 255 + 0.5);
+    }
+  }
+
+  static double signPow(double val, double exp) {
+    return Math.copySign(Math.pow(Math.abs(val), exp), val);
+  }
+
+  static double max(double[][] values, int from, int endExclusive) {
+    double result = Double.NEGATIVE_INFINITY;
+    for (int i = from; i < endExclusive; i++) {
+      for (int j = 0; j < values[i].length; j++) {
+        double value = values[i][j];
+        if (value > result) {
+          result = value;
+        }
+      }
+    }
+    return result;
+  }
+
+  private BlurHashUtil() {
+  }
+}

lib/glide/build.gradle.kts

@@ -14,6 +14,7 @@ android {
 
 dependencies {
   implementation(project(":core:util"))
+  implementation(project(":lib:blurhash"))
 
   api(libs.glide.glide)
   ksp(libs.glide.ksp)

lib/glide/src/main/java/org/signal/glide/blurhash/BlurHashModelLoader.java

@@ -1,4 +1,9 @@
-package org.thoughtcrime.securesms.blurhash;
+/*
+ * Copyright 2026 Signal Messenger, LLC
+ * SPDX-License-Identifier: AGPL-3.0-only
+ */
+
+package org.signal.glide.blurhash;
 
 import androidx.annotation.NonNull;
 
@@ -11,6 +16,8 @@ import com.bumptech.glide.load.model.ModelLoaderFactory;
 import com.bumptech.glide.load.model.MultiModelLoaderFactory;
 import com.bumptech.glide.signature.ObjectKey;
 
+import org.signal.blurhash.BlurHash;
+
 public final class BlurHashModelLoader implements ModelLoader<BlurHash, BlurHash> {
 
   private BlurHashModelLoader() {}

lib/glide/src/main/java/org/signal/glide/blurhash/BlurHashResourceDecoder.java

@@ -1,4 +1,9 @@
-package org.thoughtcrime.securesms.blurhash;
+/*
+ * Copyright 2026 Signal Messenger, LLC
+ * SPDX-License-Identifier: AGPL-3.0-only
+ */
+
+package org.signal.glide.blurhash;
 
 import android.graphics.Bitmap;
 
@@ -10,6 +15,9 @@ import com.bumptech.glide.load.ResourceDecoder;
 import com.bumptech.glide.load.engine.Resource;
 import com.bumptech.glide.load.resource.SimpleResource;
 
+import org.signal.blurhash.BlurHash;
+import org.signal.blurhash.BlurHashDecoder;
+
 import java.io.IOException;
 
 public class BlurHashResourceDecoder implements ResourceDecoder<BlurHash, Bitmap> {

settings.gradle.kts

@@ -86,6 +86,7 @@ include(":lib:spinner")
 include(":lib:video")
 include(":lib:image-editor")
 include(":lib:debuglogs-viewer")
+include(":lib:blurhash")
 
 // Feature modules
 include(":feature:registration")