Fix fever favicon failed to parse when it's SVG (#514)

* 1. WIP: fix failed to parse base64 image when it's svg+xml;
2. fix a type.

* fix some svg drawing improperly

* refactor a little

app/src/main/java/me/ash/reader/ui/component/base/Base64Image.kt

@@ -1,30 +1,69 @@
 package me.ash.reader.ui.component.base
 
-import android.graphics.Bitmap
 import android.graphics.BitmapFactory
 import android.util.Base64
 import androidx.compose.foundation.Image
 import androidx.compose.runtime.Composable
+import androidx.compose.runtime.remember
 import androidx.compose.ui.Modifier
+import androidx.compose.ui.geometry.Size
 import androidx.compose.ui.graphics.asImageBitmap
+import androidx.compose.ui.graphics.drawscope.DrawScope
+import androidx.compose.ui.graphics.nativeCanvas
+import androidx.compose.ui.graphics.painter.Painter
+import com.caverock.androidsvg.SVG
 
 @Composable
 fun Base64Image(
     modifier: Modifier = Modifier,
     base64Uri: String
 ) {
-    val bitmap = base64ToBitmap(base64Uri)
-    val imageBitmap = bitmap.asImageBitmap()
+    val isSvg = base64Uri.startsWith("image/svg")
 
-    Image(
-        bitmap = imageBitmap,
-        modifier = modifier,
-        contentDescription = null
-    )
+    if (isSvg) {
+        Image(
+            painter = base64ToPainter(base64Uri),
+            modifier = modifier,
+            contentDescription = null
+        )
+    } else {
+        val bytes = base64ToBytes(base64Uri)
+        val bitmap = BitmapFactory.decodeByteArray(bytes, 0, bytes.size)
+
+        Image(
+            bitmap = bitmap.asImageBitmap(),
+            modifier = modifier,
+            contentDescription = null
+        )
+    }
 }
 
-fun base64ToBitmap(base64String: String): Bitmap {
+private fun base64ToBytes(base64String: String): ByteArray {
     val base64Data = base64String.substringAfter("base64,")
-    val imageBytes = Base64.decode(base64Data, Base64.DEFAULT)
-    return BitmapFactory.decodeByteArray(imageBytes, 0, imageBytes.size)
+    return Base64.decode(base64Data, Base64.DEFAULT)
+}
+
+@Composable
+private fun base64ToPainter(base64Str: String): Painter {
+    return remember(base64Str) {
+        val svg = SVG.getFromString(String(base64ToBytes(base64Str)))
+        object : Painter() {
+            override val intrinsicSize: Size
+                get() {
+                    svg.let {
+                        return Size(it.documentWidth, it.documentHeight)
+                    }
+                }
+
+            override fun DrawScope.onDraw() {
+                svg.let {
+                    val canvas = drawContext.canvas.nativeCanvas
+                    // see: https://code.google.com/archive/p/androidsvg/wikis/FAQ.wiki#my-document-has-a-viewbox-but-it-is-still-not-scaling
+                    svg.setDocumentHeight("100%")
+                    svg.setDocumentWidth("100%")
+                    svg.renderToCanvas(canvas)
+                }
+            }
+        }
+    }
 }

app/src/main/res/values/strings.xml

@@ -356,7 +356,7 @@
     <string name="inoreader" translatable="false">Inoreader</string>
     <string name="local_desc">On this device</string>
     <string name="services">Services</string>
-    <string name="feedly_desc" translatable="false">feedll.com</string>
+    <string name="feedly_desc" translatable="false">feedly.com</string>
     <string name="inoreader_desc" translatable="false">inoreader.com</string>
     <string name="self_hosted">Self-Hosted</string>
     <string name="fresh_rss_desc" translatable="false">freshrss.org</string>