Add SVG Color filter

@@ -5,6 +5,7 @@
 - Fix documentation
 - Add Positioned.fill()
 - Improve GraphicState
+- Add SVG Color filter
 
 ## 3.1.0
 

@@ -38,6 +38,10 @@ class SvgColor {
       return none;
     }
 
+    if (painter.parser.colorFilter != null) {
+      return SvgColor(color: painter.parser.colorFilter);
+    }
+
     if (svgColors.containsKey(color)) {
       return SvgColor(color: svgColors[color]);
     }

@@ -15,6 +15,7 @@
  */
 
 import 'package:pdf/pdf.dart';
+import 'package:pdf/src/svg/color.dart';
 import 'package:pdf/widgets.dart';
 
 import 'brush.dart';
@@ -38,11 +39,12 @@ class SvgPainter {
   final PdfRect boundingBox;
 
   void paint() {
-    SvgGroup.fromXml(
-      parser.root,
-      this,
-      SvgBrush.defaultContext,
-    ).paint(_canvas!);
+    final brush = parser.colorFilter == null
+        ? SvgBrush.defaultContext
+        : SvgBrush.defaultContext
+            .copyWith(fill: SvgColor(color: parser.colorFilter));
+
+    SvgGroup.fromXml(parser.root, this, brush).paint(_canvas!);
   }
 
   final _fontCache = <String, Font>{};

@@ -22,7 +22,10 @@ import 'brush.dart';
 class SvgParser {
   /// Create an SVG parser
 
-  factory SvgParser({required XmlDocument xml}) {
+  factory SvgParser({
+    required XmlDocument xml,
+    PdfColor? colorFilter,
+  }) {
     final root = xml.rootElement;
 
     final vbattr = root.getAttribute('viewBox');
@@ -45,10 +48,22 @@ class SvgParser {
 
     final viewBox = PdfRect(fvb[0], fvb[1], fvb[2], fvb[3]);
 
-    return SvgParser._(width, height, viewBox, root);
+    return SvgParser._(
+      width,
+      height,
+      viewBox,
+      root,
+      colorFilter,
+    );
   }
 
-  SvgParser._(this.width, this.height, this.viewBox, this.root);
+  SvgParser._(
+    this.width,
+    this.height,
+    this.viewBox,
+    this.root,
+    this.colorFilter,
+  );
 
   final PdfRect viewBox;
 
@@ -58,6 +73,8 @@ class SvgParser {
 
   final XmlElement root;
 
+  final PdfColor? colorFilter;
+
   static final _transformParameterRegExp =
       RegExp(r'[\w.-]+(px|pt|em|cm|mm|in|%|)');
 

@@ -31,9 +31,13 @@ class SvgImage extends Widget {
     bool clip = true,
     double? width,
     double? height,
+    PdfColor? colorFilter,
   }) {
     final xml = XmlDocument.parse(svg);
-    final parser = SvgParser(xml: xml);
+    final parser = SvgParser(
+      xml: xml,
+      colorFilter: colorFilter,
+    );
 
     return SvgImage._fromParser(
       parser,