Fallback to the |Dummy| Pattern when we fail to parse a Shading Pattern (issue 5509)

src/core/pattern.js

@@ -15,7 +15,8 @@
  * limitations under the License.
  */
 /* globals ColorSpace, PDFFunction, Util, error, warn, info, isArray, isStream,
-           assert, isPDFFunction, UnsupportedManager, UNSUPPORTED_FEATURES */
+           assert, isPDFFunction, UnsupportedManager, UNSUPPORTED_FEATURES,
+           MissingDataException */
 
 'use strict';
 
@@ -49,6 +50,7 @@ var Pattern = (function PatternClosure() {
     var dict = isStream(shading) ? shading.dict : shading;
     var type = dict.get('ShadingType');
 
+    try {
       switch (type) {
         case PatternType.AXIAL:
         case PatternType.RADIAL:
@@ -60,7 +62,14 @@ var Pattern = (function PatternClosure() {
         case PatternType.TENSOR_PATCH_MESH:
           return new Shadings.Mesh(shading, matrix, xref, res);
         default:
+          throw new Error('Unknown PatternType: ' + type);
+      }
+    } catch (ex) {
+      if (ex instanceof MissingDataException) {
+        throw ex;
+      }
       UnsupportedManager.notify(UNSUPPORTED_FEATURES.shadingPattern);
+      warn(ex);
       return new Shadings.Dummy();
     }
   };

test/pdfs/issue5509.pdf.link

@@ -0,0 +1 @@
+http://web.archive.org/web/20140908142029/http://kieranhealy.org/files/papers/data-visualization.pdf

test/test_manifest.json

@@ -499,6 +499,15 @@
        "link": false,
        "type": "eq"
     },
+    {  "id": "issue5509",
+       "file": "pdfs/issue5509.pdf",
+       "md5": "1975ef8db7355b1d691bc79d0749574b",
+       "rounds": 1,
+       "link": true,
+       "firstPage": 1,
+       "lastPage": 1,
+       "type": "load"
+    },
     {  "id": "txt2pdf",
        "file": "pdfs/txt2pdf.pdf",
        "md5": "02cefa0f5e8d96313bb05163b2f88c8c",