Added SVG favicon support

ATTRIBUTION.md

@@ -32,3 +32,4 @@ FairEmail uses:
 * [POI-HMEF](https://poi.apache.org/components/hmef/index.html). Copyright © 2001-2020 The Apache Software Foundation. [Apache Software License v2](https://poi.apache.org/devel/guidelines.html#The+Licensing).
 * [GoSquared's Flag Icon Set](https://github.com/gosquared/flags). Copyright (c) 2017 Go Squared Ltd. [MIT License](https://github.com/gosquared/flags/blob/master/LICENSE.txt).
 * [OpenDyslexic](https://github.com/antijingoist/opendyslexic). Copyright (c) 12/2012 - 2019. Copyright (c) 2019-07-29, Abbie Gonzalez. [SIL Open Font License 1.1](https://github.com/antijingoist/opendyslexic/blob/master/OFL.txt).
+* [AndroidSVG](https://github.com/BigBadaboom/androidsvg). Copyright 2013 Paul LeBeau, Cave Rock Software Ltd. [Apache License 2.0](https://github.com/BigBadaboom/androidsvg/blob/master/LICENSE).

app/build.gradle

@@ -302,6 +302,7 @@ dependencies {
     def apache_poi = "3.17" // Do not update
     def reactivestreams_version = "1.0.3"
     def rxjava2_version = "2.2.21"
+    def svg_version = "1.4"
 
     // https://developer.android.com/jetpack/androidx/releases/startup
     implementation "androidx.startup:startup-runtime:$startup_version"
@@ -483,4 +484,7 @@ dependencies {
     // https://mvnrepository.com/artifact/io.reactivex.rxjava2/rxjava
     implementation "org.reactivestreams:reactive-streams:$reactivestreams_version"
     implementation "io.reactivex.rxjava2:rxjava:$rxjava2_version"
+
+    // http://bigbadaboom.github.io/androidsvg/
+    implementation "com.caverock:androidsvg:$svg_version"
 }

app/src/main/assets/ATTRIBUTION.md

@@ -32,3 +32,4 @@ FairEmail uses:
 * [POI-HMEF](https://poi.apache.org/components/hmef/index.html). Copyright © 2001-2020 The Apache Software Foundation. [Apache Software License v2](https://poi.apache.org/devel/guidelines.html#The+Licensing).
 * [GoSquared's Flag Icon Set](https://github.com/gosquared/flags). Copyright (c) 2017 Go Squared Ltd. [MIT License](https://github.com/gosquared/flags/blob/master/LICENSE.txt).
 * [OpenDyslexic](https://github.com/antijingoist/opendyslexic). Copyright (c) 12/2012 - 2019. Copyright (c) 2019-07-29, Abbie Gonzalez. [SIL Open Font License 1.1](https://github.com/antijingoist/opendyslexic/blob/master/OFL.txt).
+* [AndroidSVG](https://github.com/BigBadaboom/androidsvg). Copyright 2013 Paul LeBeau, Cave Rock Software Ltd. [Apache License 2.0](https://github.com/BigBadaboom/androidsvg/blob/master/LICENSE).

app/src/main/java/eu/faircode/email/ContactInfo.java

@@ -38,6 +38,8 @@ import android.text.TextUtils;
 import androidx.annotation.NonNull;
 import androidx.preference.PreferenceManager;
 
+import com.caverock.androidsvg.SVG;
+
 import org.json.JSONArray;
 import org.json.JSONObject;
 import org.jsoup.nodes.Document;
@@ -701,7 +703,25 @@ public class ContactInfo {
                 throw new FileNotFoundException("Error " + status + ":" + connection.getResponseMessage());
 
             if ("image/svg+xml".equals(type) || url.getPath().endsWith(".svg"))
-                ; // Android does not support SVG
+                try {
+                    SVG svg = SVG.getFromInputStream(connection.getInputStream());
+                    float w = svg.getDocumentWidth();
+                    float h = svg.getDocumentHeight();
+                    if (w < 0 || h < 0) {
+                        w = 1;
+                        h = 1;
+                    }
+                    Bitmap favicon = Bitmap.createBitmap(
+                            scaleToPixels,
+                            Math.round(scaleToPixels * h / w),
+                            Bitmap.Config.ARGB_8888);
+                    favicon.eraseColor(Color.WHITE);
+                    Canvas canvas = new Canvas(favicon);
+                    svg.renderToCanvas(canvas);
+                    return favicon;
+                } catch (Throwable ex) {
+                    throw new IOException("SVG", ex);
+                }
 
             Bitmap bitmap = ImageHelper.getScaledBitmap(connection.getInputStream(), url.toString(), scaleToPixels);
             if (bitmap == null)