From e7ab8cd8c1dc6d9aa14a66f1b775994bace2107c Mon Sep 17 00:00:00 2001
From: Calixte Denizet <calixte.denizet@gmail.com>
Date: Sun, 13 Oct 2024 16:00:36 +0200
Subject: [PATCH] Fallback on gray colorspace when there are no colorspace and
 no name in the scn/SCN arguments

It fixes #18894.
---
 src/core/evaluator.js    |  10 ++++++++++
 test/pdfs/.gitignore     |   1 +
 test/pdfs/issue18894.pdf | Bin 0 -> 2581 bytes
 test/test_manifest.json  |   8 ++++++++
 4 files changed, 19 insertions(+)
 create mode 100755 test/pdfs/issue18894.pdf

diff --git a/src/core/evaluator.js b/src/core/evaluator.js
index 064077fa7..c906abce5 100644
--- a/src/core/evaluator.js
+++ b/src/core/evaluator.js
@@ -2079,6 +2079,11 @@ class PartialEvaluator {
           case OPS.setFillColorN:
             cs = stateManager.state.patternFillColorSpace;
             if (!cs) {
+              if (isNumberArray(args, null)) {
+                args = ColorSpace.singletons.gray.getRgb(args, 0);
+                fn = OPS.setFillRGBColor;
+                break;
+              }
               args = [];
               fn = OPS.setFillTransparent;
               break;
@@ -2106,6 +2111,11 @@ class PartialEvaluator {
           case OPS.setStrokeColorN:
             cs = stateManager.state.patternStrokeColorSpace;
             if (!cs) {
+              if (isNumberArray(args, null)) {
+                args = ColorSpace.singletons.gray.getRgb(args, 0);
+                fn = OPS.setStrokeRGBColor;
+                break;
+              }
               args = [];
               fn = OPS.setStrokeTransparent;
               break;
diff --git a/test/pdfs/.gitignore b/test/pdfs/.gitignore
index c4ef395eb..fa61a789c 100644
--- a/test/pdfs/.gitignore
+++ b/test/pdfs/.gitignore
@@ -675,3 +675,4 @@
 !stamps.pdf
 !issue15096.pdf
 !issue18036.pdf
+!issue18894.pdf
diff --git a/test/pdfs/issue18894.pdf b/test/pdfs/issue18894.pdf
new file mode 100755
index 0000000000000000000000000000000000000000..cb2939ba8b1a6ae4dd468fc7bf2d5c63a9568588
GIT binary patch
literal 2581
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literal 0
HcmV?d00001

diff --git a/test/test_manifest.json b/test/test_manifest.json
index cc2bcc320..d9f045335 100644
--- a/test/test_manifest.json
+++ b/test/test_manifest.json
@@ -10692,5 +10692,13 @@
     "rounds": 1,
     "type": "eq",
     "annotations": true
+  },
+  {
+    "id": "issue18894",
+    "file": "pdfs/issue18894.pdf",
+    "md5": "5cd744bf8c0800e93c22ed92d1c162f4",
+    "rounds": 1,
+    "type": "eq",
+    "talos": false
   }
 ]