Support direction SVG property

DEVSIX-8779

Author: AnhelinaM

layout/src/main/java/com/itextpdf/layout/renderer/ParagraphRenderer.java

@@ -84,6 +84,12 @@ public LayoutResult layout(LayoutContext layoutContext) {
         if (orphansControl != null || widowsControl != null) {
             return OrphansWidowsLayoutHelper.orphansWidowsAwareLayout(this, layoutContext, orphansControl, widowsControl);
         }
+        if (RenderingMode.SVG_MODE == this.<RenderingMode>getProperty(Property.RENDERING_MODE) &&
+                !TypographyUtils.isPdfCalligraphAvailable()) {
+            // BASE_DIRECTION property is always set to the SVG text since we can't easily check whether typography is
+            // available at svg module level, but it makes no sense without typography, so it is removed here.
+            this.deleteProperty(Property.BASE_DIRECTION);
+        }
         final LayoutResult layoutResult = directLayout(layoutContext);
         updateParentLines(this);
         updateParentLines((ParagraphRenderer) layoutResult.getSplitRenderer());

svg/src/main/java/com/itextpdf/svg/SvgConstants.java

@@ -507,6 +507,11 @@ public static final class Attributes extends CommonAttributeConstants {
          */
         public static final String D = "d";
 
+        /**
+         * Attribute defining the direction used by the text
+         */
+        public static final String DIRECTION = "direction";
+
         /**
          * Attribute defining the relative x-translation of a text-element
          */

svg/src/main/java/com/itextpdf/svg/renderers/impl/TextSvgBranchRenderer.java

@@ -34,6 +34,7 @@ This file is part of the iText (R) project.
 import com.itextpdf.layout.font.FontProvider;
 import com.itextpdf.layout.font.FontSet;
 import com.itextpdf.layout.layout.LayoutPosition;
+import com.itextpdf.layout.properties.BaseDirection;
 import com.itextpdf.layout.properties.IBeforeTextRestoreExecutor;
 import com.itextpdf.layout.properties.Property;
 import com.itextpdf.layout.properties.RenderingMode;
@@ -246,6 +247,13 @@ protected void doDraw(SvgDrawContext context) {
                     new ClippedElementDrawer(getParentClipPath(), context));
         }
         this.paragraph.setMargin(0);
+        String direction = this.attributesAndStyles.get(SvgConstants.Attributes.DIRECTION);
+        boolean isRtl = "rtl".equals(direction);
+        if (isRtl) {
+            paragraph.setProperty(Property.BASE_DIRECTION, BaseDirection.RIGHT_TO_LEFT);
+        } else {
+            paragraph.setProperty(Property.BASE_DIRECTION, BaseDirection.LEFT_TO_RIGHT);
+        }
         applyTextRenderingMode(paragraph);
         applyFontProperties(paragraph, context);
         // We resolve and draw absolutely positioned text chunks similar to getTextRectangle method. We are interested
@@ -473,22 +481,27 @@ private void deepCopyChildren(TextSvgBranchRenderer deepCopy) {
 
     private void applyTextAnchor() {
         if (this.attributesAndStyles != null &&
-                this.attributesAndStyles.containsKey(SvgConstants.Attributes.TEXT_ANCHOR)) {
-            String textAnchorValue = this.getAttribute(SvgConstants.Attributes.TEXT_ANCHOR);
-            applyTextAnchor(textAnchorValue);
+                (this.attributesAndStyles.containsKey(SvgConstants.Attributes.TEXT_ANCHOR) ||
+                        this.attributesAndStyles.containsKey(SvgConstants.Attributes.DIRECTION))) {
+            String textAnchorValue = getAttributeOrDefault(SvgConstants.Attributes.TEXT_ANCHOR,
+                    SvgConstants.Values.TEXT_ANCHOR_START);
+            String direction = this.attributesAndStyles.get(SvgConstants.Attributes.DIRECTION);
+            boolean isRtl = "rtl".equals(direction);
+            applyTextAnchor(textAnchorValue, isRtl);
         }
     }
 
-    private void applyTextAnchor(String textAnchorValue) {
+    private void applyTextAnchor(String textAnchorValue, boolean isRtl) {
         if (getParent() instanceof TextSvgBranchRenderer) {
-            ((TextSvgBranchRenderer) getParent()).applyTextAnchor(textAnchorValue);
+            ((TextSvgBranchRenderer) getParent()).applyTextAnchor(textAnchorValue, isRtl);
             return;
         }
         if (SvgConstants.Values.TEXT_ANCHOR_MIDDLE.equals(textAnchorValue)) {
             paragraph.setProperty(Property.TEXT_ANCHOR, TextAnchor.MIDDLE);
             return;
         }
-        if (SvgConstants.Values.TEXT_ANCHOR_END.equals(textAnchorValue)) {
+        if (SvgConstants.Values.TEXT_ANCHOR_END.equals(textAnchorValue) && !isRtl ||
+                !SvgConstants.Values.TEXT_ANCHOR_END.equals(textAnchorValue) && isRtl) {
             paragraph.setProperty(Property.TEXT_ANCHOR, TextAnchor.END);
             return;
         }

svg/src/test/java/com/itextpdf/svg/css/DirectionTest.java

@@ -22,10 +22,12 @@ This file is part of the iText (R) project.
  */
 package com.itextpdf.svg.css;
 
+import com.itextpdf.svg.SvgConstants;
 import com.itextpdf.svg.renderers.SvgIntegrationTest;
 import com.itextpdf.test.ITextTest;
 
 import java.io.IOException;
+
 import org.junit.jupiter.api.BeforeAll;
 import org.junit.jupiter.api.Tag;
 import org.junit.jupiter.api.Test;
@@ -41,8 +43,7 @@ public static void beforeClass() {
     }
 
     @Test
-    //TODO DEVSIX-8779: update cmp file after supporting
     public void directionAttributeTest() throws IOException, InterruptedException {
-        convertAndCompareSinglePage(SOURCE_FOLDER, DESTINATION_FOLDER,"direction");
+        convertAndCompareSinglePage(SOURCE_FOLDER, DESTINATION_FOLDER, SvgConstants.Attributes.DIRECTION);
     }
 }