Fix AlignmentBaseline

android/src/main/java/com/horcrux/svg/TSpanShadowNode.java

@@ -368,10 +368,11 @@ class TSpanShadowNode extends TextShadowNode {
         final double descenderDepth = fm.descent;
         final double totalHeight = top + bottom;
         double baselineShift = 0;
-        if (mAlignmentBaseline != null) {
+        AlignmentBaseline baseline = getAlignmentBaseline();
+        if (baseline != null) {
             // TODO alignment-baseline, test / verify behavior
             // TODO get per glyph baselines from font baseline table, for high-precision alignment
-            switch (mAlignmentBaseline) {
+            switch (baseline) {
                 // https://wiki.apache.org/xmlgraphics-fop/LineLayout/AlignmentHandling
                 default:
                 case baseline:
@@ -386,7 +387,7 @@ class TSpanShadowNode extends TextShadowNode {
                     // Match the bottom of the box to the bottom of the parent’s content area.
                     // text-after-edge = text-bottom
                     // text-after-edge = descender depth
-                    baselineShift = descenderDepth;
+                    baselineShift = -descenderDepth;
                     break;
 
                 case alphabetic:
@@ -398,7 +399,7 @@ class TSpanShadowNode extends TextShadowNode {
                 case ideographic:
                     // Match the box’s ideographic character face under-side baseline to that of its parent.
                     // ideographic = descender depth
-                    baselineShift = descenderDepth;
+                    baselineShift = -descenderDepth;
                     break;
 
                 case middle:
@@ -423,7 +424,7 @@ class TSpanShadowNode extends TextShadowNode {
                     // There are no obvious formulas to calculate the position of these baselines.
                     // At the time of writing FOP puts the hanging baseline at 80% of the ascender
                     // height and the mathematical baseline at 50%.
-                    baselineShift = ascenderHeight / 2;
+                    baselineShift = 0.5 * ascenderHeight;
                     break;
 
                 case hanging:
@@ -608,7 +609,7 @@ class TSpanShadowNode extends TextShadowNode {
                 mid.preScale((float) scaledDirection, (float) side);
                 mid.postTranslate(0, (float) y);
             } else {
-                mid.setTranslate((float) startPoint, (float) (y + dy));
+                mid.setTranslate((float) startPoint, (float) (y + dy + baselineShift));
             }
 
             mid.preRotate((float) r);

android/src/main/java/com/horcrux/svg/TextShadowNode.java

@@ -15,6 +15,7 @@ import android.graphics.Path;
 
 import com.facebook.react.bridge.ReadableArray;
 import com.facebook.react.bridge.ReadableMap;
+import com.facebook.react.uimanager.ReactShadowNode;
 import com.facebook.react.uimanager.annotations.ReactProp;
 
 import javax.annotation.Nullable;
@@ -47,7 +48,7 @@ class TextShadowNode extends GroupShadowNode {
 
     @ReactProp(name = "alignmentBaseline")
     public void setMethod(@Nullable String alignment) {
-        mAlignmentBaseline = AlignmentBaseline.valueOf(alignment);
+        mAlignmentBaseline = AlignmentBaseline.getEnum(alignment);
         markUpdated();
     }
 
@@ -106,6 +107,23 @@ class TextShadowNode extends GroupShadowNode {
         return groupPath;
     }
 
+    AlignmentBaseline getAlignmentBaseline() {
+        if (mAlignmentBaseline == null) {
+            ReactShadowNode parent = this.getParent();
+            while (parent != null) {
+                if (parent instanceof TextShadowNode) {
+                    TextShadowNode node = (TextShadowNode)parent;
+                    final AlignmentBaseline baseline = node.mAlignmentBaseline;
+                    if (baseline != null) {
+                        return baseline;
+                    }
+                }
+                parent = parent.getParent();
+            }
+        }
+        return mAlignmentBaseline;
+    }
+
     void releaseCachedPath() {
         traverseChildren(new NodeRunnable() {
             public void run(VirtualNode node) {