Move Glide to its own module

15 files changed, 1138 insertions, 0 deletions

diff --git a/ui/glide/README.md b/ui/glide/README.md
new file mode 100644
index 000000000..c246f2bea
--- /dev/null
+++ b/ui/glide/README.md
@@ -0,0 +1,3 @@
+# :ui:glide
+
+Configuration and ModelLoaders for the Glide image loading library.
diff --git a/ui/glide/build.gradle b/ui/glide/build.gradle
new file mode 100644
index 000000000..ff61fc8e1
--- /dev/null
+++ b/ui/glide/build.gradle
@@ -0,0 +1,27 @@
+plugins {
+    id("com.android.library")
+}
+apply from: "../../common.gradle"
+apply from: "../../playFlavor.gradle"
+
+android {
+    lintOptions {
+        disable "InvalidPeriodicWorkRequestInterval", "ObsoleteLintCustomCheck", "DefaultLocale", "UnusedAttribute",
+                "ParcelClassLoader", "CheckResult", "TrustAllX509TrustManager",
+                "StaticFieldLeak", "IconDensities", "IconDuplicates", "MissingPermission", "AppCompatResource",
+                "GradleCompatible", "QueryPermissionsNeeded"
+    }
+}
+
+dependencies {
+    implementation project(":model")
+    implementation project(":core")
+
+    implementation "androidx.palette:palette:$paletteVersion"
+
+    implementation "com.github.bumptech.glide:glide:$glideVersion"
+    implementation "com.github.bumptech.glide:okhttp3-integration:$glideVersion@aar"
+    annotationProcessor "com.github.bumptech.glide:compiler:$glideVersion"
+    implementation "com.squareup.okhttp3:okhttp:$okhttpVersion"
+    implementation "commons-io:commons-io:$commonsioVersion"
+}
diff --git a/ui/glide/src/main/AndroidManifest.xml b/ui/glide/src/main/AndroidManifest.xml
new file mode 100644
index 000000000..ddc027b29
--- /dev/null
+++ b/ui/glide/src/main/AndroidManifest.xml
@@ -0,0 +1 @@
+<manifest package="de.danoeh.antennapod.ui.glide" />
diff --git a/ui/glide/src/main/java/de/danoeh/antennapod/ui/glide/ApGlideModule.java b/ui/glide/src/main/java/de/danoeh/antennapod/ui/glide/ApGlideModule.java
new file mode 100644
index 000000000..d233fba14
--- /dev/null
+++ b/ui/glide/src/main/java/de/danoeh/antennapod/ui/glide/ApGlideModule.java
@@ -0,0 +1,56 @@
+package de.danoeh.antennapod.ui.glide;
+
+import android.annotation.SuppressLint;
+import android.content.Context;
+import android.graphics.Bitmap;
+import android.util.Log;
+
+import androidx.annotation.NonNull;
+import com.bumptech.glide.Glide;
+import com.bumptech.glide.GlideBuilder;
+import com.bumptech.glide.Registry;
+import com.bumptech.glide.annotation.GlideModule;
+import com.bumptech.glide.load.DecodeFormat;
+import com.bumptech.glide.load.engine.DiskCacheStrategy;
+import com.bumptech.glide.load.engine.cache.InternalCacheDiskCacheFactory;
+import com.bumptech.glide.module.AppGlideModule;
+
+import de.danoeh.antennapod.model.feed.EmbeddedChapterImage;
+import java.io.InputStream;
+
+import com.bumptech.glide.request.RequestOptions;
+import java.nio.ByteBuffer;
+
+/**
+ * {@see com.bumptech.glide.integration.okhttp.OkHttpGlideModule}
+ */
+@GlideModule
+public class ApGlideModule extends AppGlideModule {
+    private static final String TAG = "ApGlideModule";
+    private static final long MEGABYTES = 1024 * 1024;
+    private static final long GIGABYTES = 1024 * 1024 * 1024;
+
+    @Override
+    public void applyOptions(@NonNull Context context, @NonNull GlideBuilder builder) {
+        builder.setDefaultRequestOptions(new RequestOptions()
+                .format(DecodeFormat.PREFER_ARGB_8888)
+                .diskCacheStrategy(DiskCacheStrategy.ALL));
+        builder.setLogLevel(Log.WARN);
+        @SuppressLint("UsableSpace")
+        long spaceAvailable = context.getCacheDir().getUsableSpace();
+        long imageCacheSize = (spaceAvailable > 2 * GIGABYTES) ? (250 * MEGABYTES) : (50 * MEGABYTES);
+        Log.d(TAG, "Free space on cache dir: " + spaceAvailable + ", using image cache size: " + imageCacheSize);
+        builder.setDiskCache(new InternalCacheDiskCacheFactory(context, imageCacheSize));
+    }
+
+    @Override
+    public void registerComponents(@NonNull Context context, @NonNull Glide glide, @NonNull Registry registry) {
+        registry.replace(String.class, InputStream.class, new MetadataRetrieverLoader.Factory(context));
+        registry.append(String.class, InputStream.class, new GenerativePlaceholderImageModelLoader.Factory());
+        registry.append(String.class, InputStream.class, new ApOkHttpUrlLoader.Factory());
+        registry.append(String.class, InputStream.class, new NoHttpStringLoader.StreamFactory());
+
+        registry.append(EmbeddedChapterImage.class, ByteBuffer.class, new ChapterImageModelLoader.Factory());
+        registry.register(Bitmap.class, PaletteBitmap.class, new PaletteBitmapTranscoder());
+    }
+}
diff --git a/ui/glide/src/main/java/de/danoeh/antennapod/ui/glide/ApOkHttpUrlLoader.java b/ui/glide/src/main/java/de/danoeh/antennapod/ui/glide/ApOkHttpUrlLoader.java
new file mode 100644
index 000000000..5c3605594
--- /dev/null
+++ b/ui/glide/src/main/java/de/danoeh/antennapod/ui/glide/ApOkHttpUrlLoader.java
@@ -0,0 +1,113 @@
+package de.danoeh.antennapod.ui.glide;
+
+import android.content.ContentResolver;
+import android.text.TextUtils;
+import androidx.annotation.NonNull;
+import androidx.annotation.Nullable;
+import com.bumptech.glide.load.Options;
+import com.bumptech.glide.load.model.GlideUrl;
+import com.bumptech.glide.load.model.ModelLoader;
+import com.bumptech.glide.load.model.ModelLoaderFactory;
+import com.bumptech.glide.load.model.MultiModelLoaderFactory;
+import com.bumptech.glide.signature.ObjectKey;
+import de.danoeh.antennapod.core.service.download.AntennapodHttpClient;
+import de.danoeh.antennapod.core.util.NetworkUtils;
+import de.danoeh.antennapod.model.feed.Feed;
+import de.danoeh.antennapod.model.feed.FeedMedia;
+import okhttp3.Interceptor;
+import okhttp3.OkHttpClient;
+import okhttp3.Protocol;
+import okhttp3.Response;
+import okhttp3.ResponseBody;
+
+import java.io.IOException;
+import java.io.InputStream;
+
+/**
+ * {@see com.bumptech.glide.integration.okhttp3.OkHttpUrlLoader}.
+ */
+class ApOkHttpUrlLoader implements ModelLoader<String, InputStream> {
+
+    /**
+     * The default factory for {@link ApOkHttpUrlLoader}s.
+     */
+    public static class Factory implements ModelLoaderFactory<String, InputStream> {
+
+        private static volatile OkHttpClient internalClient;
+        private final OkHttpClient client;
+
+        private static OkHttpClient getInternalClient() {
+            if (internalClient == null) {
+                synchronized (Factory.class) {
+                    if (internalClient == null) {
+                        OkHttpClient.Builder builder = AntennapodHttpClient.newBuilder();
+                        builder.interceptors().add(new NetworkAllowanceInterceptor());
+                        builder.cache(null); // Handled by Glide
+                        internalClient = builder.build();
+                    }
+                }
+            }
+            return internalClient;
+        }
+
+        /**
+         * Constructor for a new Factory that runs requests using a static singleton client.
+         */
+        Factory() {
+            this.client = getInternalClient();
+        }
+
+        @NonNull
+        @Override
+        public ModelLoader<String, InputStream> build(@NonNull MultiModelLoaderFactory multiFactory) {
+            return new ApOkHttpUrlLoader(client);
+        }
+
+        @Override
+        public void teardown() {
+            // Do nothing, this instance doesn't own the client.
+        }
+    }
+
+    private final OkHttpClient client;
+
+    private ApOkHttpUrlLoader(OkHttpClient client) {
+        this.client = client;
+    }
+
+    @Nullable
+    @Override
+    public LoadData<InputStream> buildLoadData(@NonNull String model, int width, int height, @NonNull Options options) {
+        return new LoadData<>(new ObjectKey(model), new ResizingOkHttpStreamFetcher(client, new GlideUrl(model)));
+    }
+
+    @Override
+    public boolean handles(@NonNull String model) {
+        return !TextUtils.isEmpty(model)
+                // If the other loaders fail, do not attempt to load as web resource
+                && !model.startsWith(Feed.PREFIX_GENERATIVE_COVER)
+                && !model.startsWith(FeedMedia.FILENAME_PREFIX_EMBEDDED_COVER)
+                // Leave content URIs to Glide's default loaders
+                && !model.startsWith(ContentResolver.SCHEME_CONTENT)
+                && !model.startsWith(ContentResolver.SCHEME_ANDROID_RESOURCE);
+    }
+
+    private static class NetworkAllowanceInterceptor implements Interceptor {
+
+        @NonNull
+        @Override
+        public Response intercept(@NonNull Chain chain) throws IOException {
+            if (NetworkUtils.isImageAllowed()) {
+                return chain.proceed(chain.request());
+            } else {
+                return new Response.Builder()
+                        .protocol(Protocol.HTTP_2)
+                        .code(420)
+                        .message("Policy Not Fulfilled")
+                        .body(ResponseBody.create(null, new byte[0]))
+                        .request(chain.request())
+                        .build();
+            }
+        }
+    }
+}
\ No newline at end of file
diff --git a/ui/glide/src/main/java/de/danoeh/antennapod/ui/glide/AudioCoverFetcher.java b/ui/glide/src/main/java/de/danoeh/antennapod/ui/glide/AudioCoverFetcher.java
new file mode 100644
index 000000000..d8e265ab5
--- /dev/null
+++ b/ui/glide/src/main/java/de/danoeh/antennapod/ui/glide/AudioCoverFetcher.java
@@ -0,0 +1,62 @@
+package de.danoeh.antennapod.ui.glide;
+
+import android.content.ContentResolver;
+import android.content.Context;
+import android.media.MediaMetadataRetriever;
+
+import android.net.Uri;
+import androidx.annotation.NonNull;
+import com.bumptech.glide.Priority;
+import com.bumptech.glide.load.DataSource;
+import com.bumptech.glide.load.data.DataFetcher;
+
+import java.io.ByteArrayInputStream;
+import java.io.InputStream;
+
+// see https://github.com/bumptech/glide/issues/699
+class AudioCoverFetcher implements DataFetcher<InputStream> {
+    private final String path;
+    private final Context context;
+
+    public AudioCoverFetcher(String path, Context context) {
+        this.path = path;
+        this.context = context;
+    }
+
+    @Override
+    public void loadData(@NonNull Priority priority, @NonNull DataCallback<? super InputStream> callback) {
+        try (MediaMetadataRetriever retriever = new MediaMetadataRetriever()) {
+            if (path.startsWith(ContentResolver.SCHEME_CONTENT)) {
+                retriever.setDataSource(context, Uri.parse(path));
+            } else {
+                retriever.setDataSource(path);
+            }
+            byte[] picture = retriever.getEmbeddedPicture();
+            if (picture != null) {
+                callback.onDataReady(new ByteArrayInputStream(picture));
+            }
+        } catch (Exception e) {
+            callback.onLoadFailed(e);
+        }
+    }
+
+    @Override public void cleanup() {
+        // nothing to clean up
+    }
+
+    @Override public void cancel() {
+        // cannot cancel
+    }
+
+    @NonNull
+    @Override
+    public Class<InputStream> getDataClass() {
+        return InputStream.class;
+    }
+
+    @NonNull
+    @Override
+    public DataSource getDataSource() {
+        return DataSource.LOCAL;
+    }
+}
diff --git a/ui/glide/src/main/java/de/danoeh/antennapod/ui/glide/ChapterImageModelLoader.java b/ui/glide/src/main/java/de/danoeh/antennapod/ui/glide/ChapterImageModelLoader.java
new file mode 100644
index 000000000..9f82e0b31
--- /dev/null
+++ b/ui/glide/src/main/java/de/danoeh/antennapod/ui/glide/ChapterImageModelLoader.java
@@ -0,0 +1,111 @@
+package de.danoeh.antennapod.ui.glide;
+
+import androidx.annotation.NonNull;
+import com.bumptech.glide.Priority;
+import com.bumptech.glide.load.DataSource;
+import com.bumptech.glide.load.Options;
+import com.bumptech.glide.load.data.DataFetcher;
+import com.bumptech.glide.load.model.ModelLoader;
+import com.bumptech.glide.load.model.ModelLoaderFactory;
+import com.bumptech.glide.load.model.MultiModelLoaderFactory;
+import com.bumptech.glide.signature.ObjectKey;
+import de.danoeh.antennapod.core.service.download.AntennapodHttpClient;
+import de.danoeh.antennapod.model.feed.EmbeddedChapterImage;
+import java.io.BufferedInputStream;
+import java.io.File;
+import java.io.FileInputStream;
+import java.io.IOException;
+import java.nio.ByteBuffer;
+import okhttp3.Request;
+import okhttp3.Response;
+import org.apache.commons.io.IOUtils;
+
+public final class ChapterImageModelLoader implements ModelLoader<EmbeddedChapterImage, ByteBuffer> {
+
+    public static class Factory implements ModelLoaderFactory<EmbeddedChapterImage, ByteBuffer> {
+        @NonNull
+        @Override
+        public ModelLoader<EmbeddedChapterImage, ByteBuffer> build(@NonNull MultiModelLoaderFactory unused) {
+            return new ChapterImageModelLoader();
+        }
+
+        @Override
+        public void teardown() {
+            // Do nothing.
+        }
+    }
+
+    @Override
+    public LoadData<ByteBuffer> buildLoadData(@NonNull EmbeddedChapterImage model,
+                                              int width,
+                                              int height,
+                                              @NonNull Options options) {
+        return new LoadData<>(new ObjectKey(model), new EmbeddedImageFetcher(model));
+    }
+
+    @Override
+    public boolean handles(@NonNull EmbeddedChapterImage model) {
+        return true;
+    }
+
+    static class EmbeddedImageFetcher implements DataFetcher<ByteBuffer> {
+        private final EmbeddedChapterImage image;
+
+        public EmbeddedImageFetcher(EmbeddedChapterImage image) {
+            this.image = image;
+        }
+
+        @Override
+        public void loadData(@NonNull Priority priority, @NonNull DataCallback<? super ByteBuffer> callback) {
+
+            BufferedInputStream stream = null;
+            try {
+                if (image.getMedia().localFileAvailable()) {
+                    File localFile = new File(image.getMedia().getLocalMediaUrl());
+                    stream = new BufferedInputStream(new FileInputStream(localFile));
+                    IOUtils.skip(stream, image.getPosition());
+                    byte[] imageContent = new byte[image.getLength()];
+                    IOUtils.read(stream, imageContent, 0, image.getLength());
+                    callback.onDataReady(ByteBuffer.wrap(imageContent));
+                } else {
+                    Request.Builder httpReq = new Request.Builder();
+                    // Skipping would download the whole file
+                    httpReq.header("Range", "bytes=" + image.getPosition()
+                            + "-" + (image.getPosition() + image.getLength()));
+                    httpReq.url(image.getMedia().getStreamUrl());
+                    Response response = AntennapodHttpClient.getHttpClient().newCall(httpReq.build()).execute();
+                    if (!response.isSuccessful() || response.body() == null) {
+                        throw new IOException("Invalid response: " + response.code() + " " + response.message());
+                    }
+                    callback.onDataReady(ByteBuffer.wrap(response.body().bytes()));
+                }
+            } catch (IOException e) {
+                callback.onLoadFailed(e);
+            } finally {
+                IOUtils.closeQuietly(stream);
+            }
+        }
+
+        @Override
+        public void cleanup() {
+            // nothing to clean up
+        }
+
+        @Override
+        public void cancel() {
+            // cannot cancel
+        }
+
+        @NonNull
+        @Override
+        public Class<ByteBuffer> getDataClass() {
+            return ByteBuffer.class;
+        }
+
+        @NonNull
+        @Override
+        public DataSource getDataSource() {
+            return DataSource.LOCAL;
+        }
+    }
+}
diff --git a/ui/glide/src/main/java/de/danoeh/antennapod/ui/glide/FastBlurTransformation.java b/ui/glide/src/main/java/de/danoeh/antennapod/ui/glide/FastBlurTransformation.java
new file mode 100644
index 000000000..a19611100
--- /dev/null
+++ b/ui/glide/src/main/java/de/danoeh/antennapod/ui/glide/FastBlurTransformation.java
@@ -0,0 +1,294 @@
+package de.danoeh.antennapod.ui.glide;
+
+import android.graphics.Bitmap;
+import android.media.ThumbnailUtils;
+import androidx.annotation.NonNull;
+import android.util.Log;
+
+import com.bumptech.glide.load.engine.bitmap_recycle.BitmapPool;
+import com.bumptech.glide.load.resource.bitmap.BitmapTransformation;
+
+import java.nio.charset.Charset;
+import java.security.MessageDigest;
+
+public class FastBlurTransformation extends BitmapTransformation {
+    private static final String ID = "de.danoeh.antennapod.core.glide.FastBlurTransformation";
+
+    private static final String TAG = FastBlurTransformation.class.getSimpleName();
+
+    private static final int STACK_BLUR_RADIUS = 10;
+
+    public FastBlurTransformation() {
+        super();
+    }
+
+    @Override
+    protected Bitmap transform(@NonNull BitmapPool pool,
+                               @NonNull Bitmap source,
+                               int outWidth,
+                               int outHeight) {
+        int targetWidth = outWidth / 3;
+        int targetHeight = (int) (1.0 * outHeight * targetWidth / outWidth);
+        Bitmap resized = ThumbnailUtils.extractThumbnail(source, targetWidth, targetHeight);
+        Bitmap result = fastBlur(resized, STACK_BLUR_RADIUS);
+        if (result == null) {
+            Log.w(TAG, "result was null");
+            return source;
+        }
+        return result;
+    }
+
+    @Override
+    public boolean equals(Object o) {
+        return o instanceof FastBlurTransformation;
+    }
+
+    @Override
+    public int hashCode() {
+        return ID.hashCode();
+    }
+
+    @Override
+    public void updateDiskCacheKey(@NonNull MessageDigest messageDigest) {
+        messageDigest.update(TAG.getBytes(Charset.defaultCharset()));
+    }
+
+    private static Bitmap fastBlur(Bitmap bitmap, int radius) {
+
+        // Stack Blur v1.0 from
+        // http://www.quasimondo.com/StackBlurForCanvas/StackBlurDemo.html
+        //
+        // Java Author: Mario Klingemann <mario at quasimondo.com>
+        // http://incubator.quasimondo.com
+        // created Feburary 29, 2004
+        // Android port : Yahel Bouaziz <yahel at kayenko.com>
+        // http://www.kayenko.com
+        // ported april 5th, 2012
+
+        // This is a compromise between Gaussian Blur and Box blur
+        // It creates much better looking blurs than Box Blur, but is
+        // 7x faster than my Gaussian Blur implementation.
+        //
+        // I called it Stack Blur because this describes best how this
+        // filter works internally: it creates a kind of moving stack
+        // of colors whilst scanning through the image. Thereby it
+        // just has to add one new block of color to the right side
+        // of the stack and remove the leftmost color. The remaining
+        // colors on the topmost layer of the stack are either added on
+        // or reduced by one, depending on if they are on the right or
+        // on the left side of the stack.
+        //
+        // If you are using this algorithm in your code please add
+        // the following line:
+        //
+        // Stack Blur Algorithm by Mario Klingemann <mario@quasimondo.com>
+
+        if (radius < 1) {
+            return null;
+        }
+
+        int w = bitmap.getWidth();
+        int h = bitmap.getHeight();
+
+        int[] pix = new int[w * h];
+        bitmap.getPixels(pix, 0, w, 0, 0, w, h);
+
+        int wm = w - 1;
+        int hm = h - 1;
+        int wh = w * h;
+        int div = radius + radius + 1;
+
+        int[] r = new int[wh];
+        int[] g = new int[wh];
+        int[] b = new int[wh];
+        int rsum;
+        int gsum;
+        int bsum;
+        int x;
+        int y;
+        int i;
+        int p;
+        int yp;
+        int yi;
+        int yw;
+        int[] vmin = new int[Math.max(w, h)];
+
+        int divsum = (div + 1) >> 1;
+        divsum *= divsum;
+        int[] dv = new int[256 * divsum];
+        for (i = 0; i < 256 * divsum; i++) {
+            dv[i] = (i / divsum);
+        }
+
+        yw = yi = 0;
+
+        int[][] stack = new int[div][3];
+        int stackpointer;
+        int stackstart;
+        int[] sir;
+        int rbs;
+        int r1 = radius + 1;
+        int routsum;
+        int goutsum;
+        int boutsum;
+        int rinsum;
+        int ginsum;
+        int binsum;
+
+        for (y = 0; y < h; y++) {
+            rinsum = ginsum = binsum = routsum = goutsum = boutsum = rsum = gsum = bsum = 0;
+            for (i = -radius; i <= radius; i++) {
+                p = pix[yi + Math.min(wm, Math.max(i, 0))];
+                sir = stack[i + radius];
+                sir[0] = (p & 0xff0000) >> 16;
+                sir[1] = (p & 0x00ff00) >> 8;
+                sir[2] = (p & 0x0000ff);
+                rbs = r1 - Math.abs(i);
+                rsum += sir[0] * rbs;
+                gsum += sir[1] * rbs;
+                bsum += sir[2] * rbs;
+                if (i > 0) {
+                    rinsum += sir[0];
+                    ginsum += sir[1];
+                    binsum += sir[2];
+                } else {
+                    routsum += sir[0];
+                    goutsum += sir[1];
+                    boutsum += sir[2];
+                }
+            }
+            stackpointer = radius;
+
+            for (x = 0; x < w; x++) {
+
+                r[yi] = dv[rsum];
+                g[yi] = dv[gsum];
+                b[yi] = dv[bsum];
+
+                rsum -= routsum;
+                gsum -= goutsum;
+                bsum -= boutsum;
+
+                stackstart = stackpointer - radius + div;
+                sir = stack[stackstart % div];
+
+                routsum -= sir[0];
+                goutsum -= sir[1];
+                boutsum -= sir[2];
+
+                if (y == 0) {
+                    vmin[x] = Math.min(x + radius + 1, wm);
+                }
+                p = pix[yw + vmin[x]];
+
+                sir[0] = (p & 0xff0000) >> 16;
+                sir[1] = (p & 0x00ff00) >> 8;
+                sir[2] = (p & 0x0000ff);
+
+                rinsum += sir[0];
+                ginsum += sir[1];
+                binsum += sir[2];
+
+                rsum += rinsum;
+                gsum += ginsum;
+                bsum += binsum;
+
+                stackpointer = (stackpointer + 1) % div;
+                sir = stack[(stackpointer) % div];
+
+                routsum += sir[0];
+                goutsum += sir[1];
+                boutsum += sir[2];
+
+                rinsum -= sir[0];
+                ginsum -= sir[1];
+                binsum -= sir[2];
+
+                yi++;
+            }
+            yw += w;
+        }
+        for (x = 0; x < w; x++) {
+            rinsum = ginsum = binsum = routsum = goutsum = boutsum = rsum = gsum = bsum = 0;
+            yp = -radius * w;
+            for (i = -radius; i <= radius; i++) {
+                yi = Math.max(0, yp) + x;
+
+                sir = stack[i + radius];
+
+                sir[0] = r[yi];
+                sir[1] = g[yi];
+                sir[2] = b[yi];
+
+                rbs = r1 - Math.abs(i);
+
+                rsum += r[yi] * rbs;
+                gsum += g[yi] * rbs;
+                bsum += b[yi] * rbs;
+
+                if (i > 0) {
+                    rinsum += sir[0];
+                    ginsum += sir[1];
+                    binsum += sir[2];
+                } else {
+                    routsum += sir[0];
+                    goutsum += sir[1];
+                    boutsum += sir[2];
+                }
+
+                if (i < hm) {
+                    yp += w;
+                }
+            }
+            yi = x;
+            stackpointer = radius;
+            for (y = 0; y < h; y++) {
+                // Set alpha to 1
+                pix[yi] = 0xff000000 | (dv[rsum] << 16) | (dv[gsum] << 8) | dv[bsum];
+
+                rsum -= routsum;
+                gsum -= goutsum;
+                bsum -= boutsum;
+
+                stackstart = stackpointer - radius + div;
+                sir = stack[stackstart % div];
+
+                routsum -= sir[0];
+                goutsum -= sir[1];
+                boutsum -= sir[2];
+
+                if (x == 0) {
+                    vmin[y] = Math.min(y + r1, hm) * w;
+                }
+                p = x + vmin[y];
+
+                sir[0] = r[p];
+                sir[1] = g[p];
+                sir[2] = b[p];
+
+                rinsum += sir[0];
+                ginsum += sir[1];
+                binsum += sir[2];
+
+                rsum += rinsum;
+                gsum += ginsum;
+                bsum += binsum;
+
+                stackpointer = (stackpointer + 1) % div;
+                sir = stack[stackpointer];
+
+                routsum += sir[0];
+                goutsum += sir[1];
+                boutsum += sir[2];
+
+                rinsum -= sir[0];
+                ginsum -= sir[1];
+                binsum -= sir[2];
+
+                yi += w;
+            }
+        }
+        bitmap.setPixels(pix, 0, w, 0, 0, w, h);
+        return bitmap;
+    }
+}
diff --git a/ui/glide/src/main/java/de/danoeh/antennapod/ui/glide/GenerativePlaceholderImageModelLoader.java b/ui/glide/src/main/java/de/danoeh/antennapod/ui/glide/GenerativePlaceholderImageModelLoader.java
new file mode 100644
index 000000000..3ad8fba6a
--- /dev/null
+++ b/ui/glide/src/main/java/de/danoeh/antennapod/ui/glide/GenerativePlaceholderImageModelLoader.java
@@ -0,0 +1,139 @@
+package de.danoeh.antennapod.ui.glide;
+
+import android.graphics.Bitmap;
+import android.graphics.Canvas;
+import android.graphics.LinearGradient;
+import android.graphics.Paint;
+import android.graphics.PorterDuff;
+import android.graphics.PorterDuffColorFilter;
+import android.graphics.Shader;
+import androidx.annotation.NonNull;
+import com.bumptech.glide.Priority;
+import com.bumptech.glide.load.DataSource;
+import com.bumptech.glide.load.Options;
+import com.bumptech.glide.load.data.DataFetcher;
+import com.bumptech.glide.load.model.ModelLoader;
+import com.bumptech.glide.load.model.ModelLoaderFactory;
+import com.bumptech.glide.load.model.MultiModelLoaderFactory;
+import com.bumptech.glide.signature.ObjectKey;
+import de.danoeh.antennapod.model.feed.Feed;
+
+import java.io.ByteArrayInputStream;
+import java.io.ByteArrayOutputStream;
+import java.io.InputStream;
+import java.util.Random;
+
+public final class GenerativePlaceholderImageModelLoader implements ModelLoader<String, InputStream> {
+
+    public static class Factory implements ModelLoaderFactory<String, InputStream> {
+        @NonNull
+        @Override
+        public ModelLoader<String, InputStream> build(@NonNull MultiModelLoaderFactory unused) {
+            return new GenerativePlaceholderImageModelLoader();
+        }
+
+        @Override
+        public void teardown() {
+            // Do nothing.
+        }
+    }
+
+    @Override
+    public LoadData<InputStream> buildLoadData(@NonNull String model, int width, int height, @NonNull Options options) {
+        return new LoadData<>(new ObjectKey(model), new EmbeddedImageFetcher(model, width, height));
+    }
+
+    @Override
+    public boolean handles(@NonNull String model) {
+        return model.startsWith(Feed.PREFIX_GENERATIVE_COVER);
+    }
+
+    static class EmbeddedImageFetcher implements DataFetcher<InputStream> {
+        private static final int[] PALETTES = {0xff78909c, 0xffff6f00, 0xff388e3c,
+                0xff00838f, 0xff7b1fa2, 0xffb71c1c, 0xff2196f3};
+        private final String model;
+        private final int width;
+        private final int height;
+
+        public EmbeddedImageFetcher(String model, int width, int height) {
+            this.model = model;
+            this.width = width;
+            this.height = height;
+        }
+
+        @Override
+        public void loadData(@NonNull Priority priority, @NonNull DataCallback<? super InputStream> callback) {
+            final Bitmap bitmap = Bitmap.createBitmap(width, height, Bitmap.Config.ARGB_8888);
+            final Canvas canvas = new Canvas(bitmap);
+            final Random generator = new Random(model.hashCode());
+            final int lineGridSteps = 4 + generator.nextInt(4);
+            final int slope = width / 4;
+            final float shadowWidth = width * 0.01f;
+            final float lineDistance = ((float) width / (lineGridSteps - 2));
+            final int baseColor = PALETTES[generator.nextInt(PALETTES.length)];
+
+            Paint paint = new Paint();
+            int color = randomShadeOfGrey(generator);
+            paint.setColor(color);
+            paint.setStrokeWidth(lineDistance);
+            paint.setColorFilter(new PorterDuffColorFilter(baseColor, PorterDuff.Mode.MULTIPLY));
+            Paint paintShadow = new Paint();
+            paintShadow.setColor(0xff000000);
+            paintShadow.setStrokeWidth(lineDistance);
+
+            int forcedColorChange = 1 + generator.nextInt(lineGridSteps - 2);
+            for (int i = lineGridSteps - 1; i >= 0; i--) {
+                float linePos = (i - 0.5f) * lineDistance;
+                boolean switchColor = generator.nextFloat() < 0.3f || i == forcedColorChange;
+                if (switchColor) {
+                    int newColor = color;
+                    while (newColor == color) {
+                        newColor = randomShadeOfGrey(generator);
+                    }
+                    color = newColor;
+                    paint.setColor(newColor);
+                    canvas.drawLine(linePos + slope + shadowWidth, -slope,
+                            linePos - slope + shadowWidth, height + slope, paintShadow);
+                }
+                canvas.drawLine(linePos + slope, -slope,
+                        linePos - slope, height + slope, paint);
+            }
+
+            Paint gradientPaint = new Paint();
+            paint.setDither(true);
+            gradientPaint.setShader(new LinearGradient(0, 0, 0, height, 0x00000000, 0x55000000, Shader.TileMode.CLAMP));
+            canvas.drawRect(0, 0, width, height, gradientPaint);
+
+            ByteArrayOutputStream baos = new ByteArrayOutputStream();
+            bitmap.compress(Bitmap.CompressFormat.JPEG, 100, baos);
+            InputStream is = new ByteArrayInputStream(baos.toByteArray());
+            callback.onDataReady(is);
+        }
+
+        private static int randomShadeOfGrey(Random generator) {
+            return 0xff777777 + 0x222222 * generator.nextInt(5);
+        }
+
+        @Override
+        public void cleanup() {
+            // nothing to clean up
+        }
+
+        @Override
+        public void cancel() {
+            // cannot cancel
+        }
+
+        @NonNull
+        @Override
+        public Class<InputStream> getDataClass() {
+            return InputStream.class;
+        }
+
+        @NonNull
+        @Override
+        public DataSource getDataSource() {
+            return DataSource.LOCAL;
+        }
+    }
+}
diff --git a/ui/glide/src/main/java/de/danoeh/antennapod/ui/glide/MetadataRetrieverLoader.java b/ui/glide/src/main/java/de/danoeh/antennapod/ui/glide/MetadataRetrieverLoader.java
new file mode 100644
index 000000000..a5046b7d0
--- /dev/null
+++ b/ui/glide/src/main/java/de/danoeh/antennapod/ui/glide/MetadataRetrieverLoader.java
@@ -0,0 +1,57 @@
+package de.danoeh.antennapod.ui.glide;
+
+import android.content.Context;
+import androidx.annotation.NonNull;
+import androidx.annotation.Nullable;
+import com.bumptech.glide.load.Options;
+import com.bumptech.glide.load.model.ModelLoader;
+import com.bumptech.glide.load.model.ModelLoaderFactory;
+import com.bumptech.glide.load.model.MultiModelLoaderFactory;
+import com.bumptech.glide.signature.ObjectKey;
+import de.danoeh.antennapod.model.feed.FeedMedia;
+
+import java.io.InputStream;
+
+class MetadataRetrieverLoader implements ModelLoader<String, InputStream> {
+
+    /**
+     * The default factory for {@link MetadataRetrieverLoader}s.
+     */
+    public static class Factory implements ModelLoaderFactory<String, InputStream> {
+        private final Context context;
+
+        Factory(Context context) {
+            this.context = context;
+        }
+
+        @NonNull
+        @Override
+        public ModelLoader<String, InputStream> build(@NonNull MultiModelLoaderFactory multiFactory) {
+            return new MetadataRetrieverLoader(context);
+        }
+
+        @Override
+        public void teardown() {
+            // Do nothing, this instance doesn't own the client.
+        }
+    }
+
+    private final Context context;
+
+    private MetadataRetrieverLoader(Context context) {
+        this.context = context;
+    }
+
+    @Nullable
+    @Override
+    public LoadData<InputStream> buildLoadData(@NonNull String model,
+                                               int width, int height, @NonNull Options options) {
+        return new LoadData<>(new ObjectKey(model),
+                new AudioCoverFetcher(model.replace(FeedMedia.FILENAME_PREFIX_EMBEDDED_COVER, ""), context));
+    }
+
+    @Override
+    public boolean handles(@NonNull String model) {
+        return model.startsWith(FeedMedia.FILENAME_PREFIX_EMBEDDED_COVER);
+    }
+}
diff --git a/ui/glide/src/main/java/de/danoeh/antennapod/ui/glide/NoHttpStringLoader.java b/ui/glide/src/main/java/de/danoeh/antennapod/ui/glide/NoHttpStringLoader.java
new file mode 100644
index 000000000..63af834b6
--- /dev/null
+++ b/ui/glide/src/main/java/de/danoeh/antennapod/ui/glide/NoHttpStringLoader.java
@@ -0,0 +1,45 @@
+package de.danoeh.antennapod.ui.glide;
+
+import android.net.Uri;
+import androidx.annotation.NonNull;
+import com.bumptech.glide.load.model.ModelLoader;
+import com.bumptech.glide.load.model.ModelLoaderFactory;
+import com.bumptech.glide.load.model.MultiModelLoaderFactory;
+import com.bumptech.glide.load.model.StringLoader;
+import de.danoeh.antennapod.model.feed.Feed;
+import de.danoeh.antennapod.model.feed.FeedMedia;
+
+import java.io.InputStream;
+
+/**
+ * StringLoader that does not handle http/https urls. Used to avoid fallback to StringLoader when
+ * AntennaPod blocks mobile image loading.
+ */
+public final class NoHttpStringLoader extends StringLoader<InputStream> {
+
+    public static class StreamFactory implements ModelLoaderFactory<String, InputStream> {
+        @NonNull
+        @Override
+        public ModelLoader<String, InputStream> build(@NonNull MultiModelLoaderFactory multiFactory) {
+            return new NoHttpStringLoader(multiFactory.build(Uri.class, InputStream.class));
+        }
+
+        @Override
+        public void teardown() {
+            // Do nothing.
+        }
+    }
+
+    public NoHttpStringLoader(ModelLoader<Uri, InputStream> uriLoader) {
+        super(uriLoader);
+    }
+
+    @Override
+    public boolean handles(@NonNull String model) {
+        return !model.startsWith("http")
+                // If the custom loaders fail, do not attempt to load with Glide internal loaders
+                && !model.startsWith(Feed.PREFIX_GENERATIVE_COVER)
+                && !model.startsWith(FeedMedia.FILENAME_PREFIX_EMBEDDED_COVER)
+                && super.handles(model);
+    }
+}
diff --git a/ui/glide/src/main/java/de/danoeh/antennapod/ui/glide/PaletteBitmap.java b/ui/glide/src/main/java/de/danoeh/antennapod/ui/glide/PaletteBitmap.java
new file mode 100644
index 000000000..a3b590ba2
--- /dev/null
+++ b/ui/glide/src/main/java/de/danoeh/antennapod/ui/glide/PaletteBitmap.java
@@ -0,0 +1,20 @@
+/*
+ * Source: https://github.com/bumptech/glide/wiki/Custom-targets#palette-example
+ */
+
+package de.danoeh.antennapod.ui.glide;
+
+import android.graphics.Bitmap;
+
+import androidx.annotation.NonNull;
+import androidx.palette.graphics.Palette;
+
+public class PaletteBitmap {
+    public final Palette palette;
+    public final Bitmap bitmap;
+
+    public PaletteBitmap(@NonNull Bitmap bitmap, Palette palette) {
+        this.bitmap = bitmap;
+        this.palette = palette;
+    }
+}
\ No newline at end of file
diff --git a/ui/glide/src/main/java/de/danoeh/antennapod/ui/glide/PaletteBitmapResource.java b/ui/glide/src/main/java/de/danoeh/antennapod/ui/glide/PaletteBitmapResource.java
new file mode 100644
index 000000000..2fd18a0cb
--- /dev/null
+++ b/ui/glide/src/main/java/de/danoeh/antennapod/ui/glide/PaletteBitmapResource.java
@@ -0,0 +1,40 @@
+/*
+ * Source: https://github.com/bumptech/glide/wiki/Custom-targets#palette-example
+ */
+
+package de.danoeh.antennapod.ui.glide;
+
+import androidx.annotation.NonNull;
+
+import com.bumptech.glide.load.engine.Resource;
+import com.bumptech.glide.util.Util;
+
+public class PaletteBitmapResource implements Resource<PaletteBitmap> {
+    private final PaletteBitmap paletteBitmap;
+
+    public PaletteBitmapResource(@NonNull PaletteBitmap paletteBitmap) {
+        this.paletteBitmap = paletteBitmap;
+    }
+
+    @NonNull
+    @Override
+    public Class<PaletteBitmap> getResourceClass() {
+        return PaletteBitmap.class;
+    }
+
+    @NonNull
+    @Override
+    public PaletteBitmap get() {
+        return paletteBitmap;
+    }
+
+    @Override
+    public int getSize() {
+        return Util.getBitmapByteSize(paletteBitmap.bitmap);
+    }
+
+    @Override
+    public void recycle() {
+        paletteBitmap.bitmap.recycle();
+    }
+}
\ No newline at end of file
diff --git a/ui/glide/src/main/java/de/danoeh/antennapod/ui/glide/PaletteBitmapTranscoder.java b/ui/glide/src/main/java/de/danoeh/antennapod/ui/glide/PaletteBitmapTranscoder.java
new file mode 100644
index 000000000..75599a30a
--- /dev/null
+++ b/ui/glide/src/main/java/de/danoeh/antennapod/ui/glide/PaletteBitmapTranscoder.java
@@ -0,0 +1,32 @@
+/*
+ * Source: https://github.com/bumptech/glide/wiki/Custom-targets#palette-example
+ */
+
+package de.danoeh.antennapod.ui.glide;
+
+import android.graphics.Bitmap;
+
+import androidx.annotation.NonNull;
+import androidx.annotation.Nullable;
+import androidx.palette.graphics.Palette;
+
+import com.bumptech.glide.load.Options;
+import com.bumptech.glide.load.engine.Resource;
+import com.bumptech.glide.load.resource.transcode.ResourceTranscoder;
+
+import de.danoeh.antennapod.core.preferences.UserPreferences;
+
+public class PaletteBitmapTranscoder implements ResourceTranscoder<Bitmap, PaletteBitmap> {
+
+    @Nullable
+    @Override
+    public Resource<PaletteBitmap> transcode(@NonNull Resource<Bitmap> toTranscode, @NonNull Options options) {
+        Bitmap bitmap = toTranscode.get();
+        Palette palette = null;
+        if (UserPreferences.shouldShowSubscriptionTitle()) {
+            palette = new Palette.Builder(bitmap).generate();
+        }
+        PaletteBitmap result = new PaletteBitmap(bitmap, palette);
+        return new PaletteBitmapResource(result);
+    }
+}
diff --git a/ui/glide/src/main/java/de/danoeh/antennapod/ui/glide/ResizingOkHttpStreamFetcher.java b/ui/glide/src/main/java/de/danoeh/antennapod/ui/glide/ResizingOkHttpStreamFetcher.java
new file mode 100644
index 000000000..2d4e4d45f
--- /dev/null
+++ b/ui/glide/src/main/java/de/danoeh/antennapod/ui/glide/ResizingOkHttpStreamFetcher.java
@@ -0,0 +1,138 @@
+package de.danoeh.antennapod.ui.glide;
+
+import android.graphics.Bitmap;
+import android.graphics.BitmapFactory;
+import android.os.Build;
+import android.util.Log;
+
+import androidx.annotation.NonNull;
+import androidx.annotation.Nullable;
+import com.bumptech.glide.Priority;
+import com.bumptech.glide.integration.okhttp3.OkHttpStreamFetcher;
+import com.bumptech.glide.load.data.DataFetcher;
+import com.bumptech.glide.load.model.GlideUrl;
+import okhttp3.Call;
+import org.apache.commons.io.FileUtils;
+import org.apache.commons.io.IOUtils;
+
+import java.io.File;
+import java.io.FileInputStream;
+import java.io.FileNotFoundException;
+import java.io.FileOutputStream;
+import java.io.IOException;
+import java.io.InputStream;
+import java.io.OutputStream;
+
+public class ResizingOkHttpStreamFetcher extends OkHttpStreamFetcher {
+    private static final String TAG = "ResizingOkHttpStreamFet";
+    private static final int MAX_DIMENSIONS = 1500;
+    private static final int MAX_FILE_SIZE = 1024 * 1024; // 1 MB
+
+    private FileInputStream stream;
+    private File tempIn;
+    private File tempOut;
+
+    public ResizingOkHttpStreamFetcher(Call.Factory client, GlideUrl url) {
+        super(client, url);
+    }
+
+    @Override
+    public void loadData(@NonNull Priority priority, @NonNull DataFetcher.DataCallback<? super InputStream> callback) {
+        super.loadData(priority, new DataFetcher.DataCallback<InputStream>() {
+            @Override
+            public void onDataReady(@Nullable InputStream data) {
+                if (data == null) {
+                    callback.onDataReady(null);
+                    return;
+                }
+                try {
+                    tempIn = File.createTempFile("resize_", null);
+                    tempOut = File.createTempFile("resize_", null);
+                    OutputStream outputStream = new FileOutputStream(tempIn);
+                    IOUtils.copy(data, outputStream);
+                    outputStream.close();
+                    IOUtils.closeQuietly(data);
+
+                    if (tempIn.length() <= MAX_FILE_SIZE) {
+                        try {
+                            stream = new FileInputStream(tempIn);
+                            callback.onDataReady(stream); // Just deliver the original, non-scaled image
+                        } catch (FileNotFoundException fileNotFoundException) {
+                            callback.onLoadFailed(fileNotFoundException);
+                        }
+                        return;
+                    }
+
+                    BitmapFactory.Options options = new BitmapFactory.Options();
+                    options.inJustDecodeBounds = true;
+                    FileInputStream in = new FileInputStream(tempIn);
+                    BitmapFactory.decodeStream(in, null, options);
+                    IOUtils.closeQuietly(in);
+
+                    if (options.outWidth == -1 || options.outHeight == -1) {
+                        throw new IOException("Not a valid image");
+                    } else if (Math.max(options.outHeight, options.outWidth) >= MAX_DIMENSIONS) {
+                        double sampleSize = (double) Math.max(options.outHeight, options.outWidth) / MAX_DIMENSIONS;
+                        options.inSampleSize = (int) Math.pow(2d, Math.floor(Math.log(sampleSize) / Math.log(2d)));
+                    }
+
+                    options.inJustDecodeBounds = false;
+                    in = new FileInputStream(tempIn);
+                    Bitmap bitmap = BitmapFactory.decodeStream(in, null, options);
+                    IOUtils.closeQuietly(in);
+
+                    Bitmap.CompressFormat format = Build.VERSION.SDK_INT < 30
+                            ? Bitmap.CompressFormat.WEBP : Bitmap.CompressFormat.WEBP_LOSSY;
+
+                    int quality = 100;
+                    while (true) {
+                        FileOutputStream out = new FileOutputStream(tempOut);
+                        bitmap.compress(format, quality, out);
+                        IOUtils.closeQuietly(out);
+
+                        if (tempOut.length() > 3 * MAX_FILE_SIZE && quality >= 45) {
+                            quality -= 40;
+                        } else if (tempOut.length() > 2 * MAX_FILE_SIZE && quality >= 25) {
+                            quality -= 20;
+                        } else if (tempOut.length() > MAX_FILE_SIZE && quality >= 15) {
+                            quality -= 10;
+                        } else if (tempOut.length() > MAX_FILE_SIZE && quality >= 10) {
+                            quality -= 5;
+                        } else {
+                            break;
+                        }
+                    }
+                    bitmap.recycle();
+
+                    stream = new FileInputStream(tempOut);
+                    callback.onDataReady(stream);
+                    Log.d(TAG, "Compressed image from " + tempIn.length() / 1024
+                            + " to " + tempOut.length() / 1024 + " kB (quality: " + quality + "%)");
+                } catch (Throwable e) {
+                    e.printStackTrace();
+
+                    try {
+                        stream = new FileInputStream(tempIn);
+                        callback.onDataReady(stream); // Just deliver the original, non-scaled image
+                    } catch (FileNotFoundException fileNotFoundException) {
+                        e.printStackTrace();
+                        callback.onLoadFailed(fileNotFoundException);
+                    }
+                }
+            }
+
+            @Override
+            public void onLoadFailed(@NonNull Exception e) {
+                callback.onLoadFailed(e);
+            }
+        });
+    }
+
+    @Override
+    public void cleanup() {
+        IOUtils.closeQuietly(stream);
+        FileUtils.deleteQuietly(tempIn);
+        FileUtils.deleteQuietly(tempOut);
+        super.cleanup();
+    }
+}