Add SvgPictureMediaDecoder

CHANGELOG.md

@@ -4,6 +4,9 @@
 * `MarkwonEditor` to highlight markdown input whilst editing (new module: `markwon-editor`)
 * `Markwon#configuration` method to expose `MarkwonConfiguration` via public API
 * `HeadingSpan#getLevel` getter
+* Add `SvgPictureMediaDecoder` in `image` module to deal with SVG without dimensions ([#165])
+
+[#165]: https://github.com/noties/Markwon/issues/165
 
 # 4.1.2
 * Do not re-use RenderProps when creating a new visitor (fixes [#171])

markwon-image/src/main/java/io/noties/markwon/image/svg/SvgPictureMediaDecoder.java

@@ -0,0 +1,51 @@
+package io.noties.markwon.image.svg;
+
+import android.graphics.Picture;
+import android.graphics.drawable.Drawable;
+import android.graphics.drawable.PictureDrawable;
+
+import androidx.annotation.NonNull;
+import androidx.annotation.Nullable;
+
+import com.caverock.androidsvg.SVG;
+import com.caverock.androidsvg.SVGParseException;
+
+import java.io.InputStream;
+import java.util.Collection;
+import java.util.Collections;
+
+import io.noties.markwon.image.MediaDecoder;
+
+/**
+ * @since 4.2.0-SNAPSHOT
+ */
+public class SvgPictureMediaDecoder extends MediaDecoder {
+
+    public static final String CONTENT_TYPE = "image/svg+xml";
+
+    @NonNull
+    public static SvgPictureMediaDecoder create() {
+        return new SvgPictureMediaDecoder();
+    }
+
+    @NonNull
+    @Override
+    public Drawable decode(@Nullable String contentType, @NonNull InputStream inputStream) {
+
+        final SVG svg;
+        try {
+            svg = SVG.getFromInputStream(inputStream);
+        } catch (SVGParseException e) {
+            throw new IllegalStateException("Exception decoding SVG", e);
+        }
+
+        final Picture picture = svg.renderToPicture();
+        return new PictureDrawable(picture);
+    }
+
+    @NonNull
+    @Override
+    public Collection<String> supportedTypes() {
+        return Collections.singleton(CONTENT_TYPE);
+    }
+}