Fetch parameters if they are a |Ref| in CalGray/CalRGB color spaces (issue 5747)

src/core/colorspace.js

@@ -275,10 +275,10 @@ var ColorSpace = (function ColorSpaceClosure() {
         case 'CMYK':
           return 'DeviceCmykCS';
         case 'CalGray':
-          params = cs[1].getAll();
+          params = xref.fetchIfRef(cs[1]).getAll();
           return ['CalGrayCS', params];
         case 'CalRGB':
-          params = cs[1].getAll();
+          params = xref.fetchIfRef(cs[1]).getAll();
           return ['CalRGBCS', params];
         case 'ICCBased':
           var stream = xref.fetchIfRef(cs[1]);

test/pdfs/.gitignore

@@ -76,6 +76,7 @@
 !issue5470.pdf
 !issue5501.pdf
 !issue5599.pdf
+!issue5747.pdf
 !gradientfill.pdf
 !bug903856.pdf
 !bug850854.pdf

test/test_manifest.json

@@ -1036,6 +1036,13 @@
        "link": false,
        "type": "eq"
     },
+    {  "id": "issue5747",
+       "file": "pdfs/issue5747.pdf",
+       "md5": "5c36afc931dd1a3321ffa2e88952d174",
+       "rounds": 1,
+       "link": false,
+       "type": "eq"
+    },
     {  "id": "bug893730",
        "file": "pdfs/bug893730.pdf",
        "md5": "2587379fb1b3bbff89c14f0863e78383",