From f1cca779623974674aaacdf960039bf72667d5da Mon Sep 17 00:00:00 2001
From: Agriya Dev5 <agriya.dev5@agriya.in>
Date: Wed, 26 May 2021 20:02:32 +0530
Subject: [PATCH] #546 feGaussianBlur element iterate from filter issue fixes

---
 src/svgcanvas/selected-elem.js |  9 +++++----
 src/svgcanvas/svgcanvas.js     |  8 +++++++-
 src/svgcanvas/utilities.js     | 20 ++++++++++++++++++++
 3 files changed, 32 insertions(+), 5 deletions(-)

diff --git a/src/svgcanvas/selected-elem.js b/src/svgcanvas/selected-elem.js
index 79bd7bd3..811c4ebf 100644
--- a/src/svgcanvas/selected-elem.js
+++ b/src/svgcanvas/selected-elem.js
@@ -12,7 +12,7 @@ import * as hstry from './history.js';
 import * as pathModule from './path.js';
 import {
   isNullish, getStrokedBBoxDefaultVisible, setHref, getElem, getHref, getVisibleElements,
-  findDefs, getRotationAngle, getRefElem, getBBox as utilsGetBBox, walkTreePost, assignAttributes
+  findDefs, getRotationAngle, getRefElem, getBBox as utilsGetBBox, walkTreePost, assignAttributes, getFeGaussianBlur
 } from './utilities.js';
 import {
   transformPoint, matrixMultiply, transformListToTransform
@@ -576,15 +576,16 @@ export const pushGroupProperty = function (g, undoable) {
       } else {
         gfilter = getRefElem(elem.getAttribute('filter'));
       }
-
+      // const filterElem = getRefElem(gfilter);
+      const blurElem = getFeGaussianBlur(gfilter);
       // Change this in future for different filters
-      const suffix = (gfilter.firstChild.tagName === 'feGaussianBlur') ? 'blur' : 'filter';
+      const suffix = (blurElem?.tagName === 'feGaussianBlur') ? 'blur' : 'filter';
       gfilter.id = elem.id + '_' + suffix;
       elementContext_.changeSelectedAttribute('filter', 'url(#' + gfilter.id + ')', [ elem ]);
 
       // Update blur value
       if (cblur) {
-        elementContext_.changeSelectedAttribute('stdDeviation', cblur, [ gfilter.firstChild ]);
+        elementContext_.changeSelectedAttribute('stdDeviation', cblur, [ blurElem ]);
         elementContext_.getCanvas().setBlurOffsets(gfilter, cblur);
       }
     }
diff --git a/src/svgcanvas/svgcanvas.js b/src/svgcanvas/svgcanvas.js
index bb573e95..28461b85 100644
--- a/src/svgcanvas/svgcanvas.js
+++ b/src/svgcanvas/svgcanvas.js
@@ -71,7 +71,7 @@ import {
   preventClickDefault, walkTree, getBBoxOfElementAsPath, convertToPath, encode64, decode64,
   getVisibleElements, dropXMLInternalSubset, init as utilsInit,
   getBBox as utilsGetBBox, getStrokedBBoxDefaultVisible, isNullish, blankPageObjectURL,
-  $id, $qa, $qq
+  $id, $qa, $qq, getFeGaussianBlur
 } from './utilities.js';
 import {
   transformPoint, matrixMultiply, hasMatrixTransform, transformListToTransform,
@@ -2177,6 +2177,12 @@ class SvgCanvas {
           const blur = getElem(elem.id + '_blur');
           if (blur) {
             val = blur.firstChild.getAttribute('stdDeviation');
+          } else {
+            const filterElem = getRefElem(filterUrl);
+            const blurElem = getFeGaussianBlur(filterElem);
+            if (blurElem !== null) {
+              val = blurElem.getAttribute('stdDeviation');
+            }
           }
         }
       }
diff --git a/src/svgcanvas/utilities.js b/src/svgcanvas/utilities.js
index 1e904615..c5e1dee1 100644
--- a/src/svgcanvas/utilities.js
+++ b/src/svgcanvas/utilities.js
@@ -1203,6 +1203,26 @@ export let getRotationAngle = function (elem, toRad) {
 export const getRefElem = function (attrVal) {
   return getElem(getUrlFromAttr(attrVal).substr(1));
 };
+/**
+* Get the reference element associated with the given attribute value.
+* @function module:utilities.getFeGaussianBlur
+* @param {any} Element
+* @returns {any} Reference element
+*/
+export const getFeGaussianBlur = function (ele) {
+  if (ele?.firstChild?.tagName === 'feGaussianBlur') {
+    return ele.firstChild;
+  } else {
+    const childrens = ele.children;
+    // eslint-disable-next-line no-unused-vars
+    for (const [ _, value ] of Object.entries(childrens)) {
+      if (value.tagName === 'feGaussianBlur') {
+        return value;
+      }
+    }
+  }
+  return null;
+};
 
 /**
 * Get a DOM element by ID within the SVG root element.