From 4bd11c8eb4428289c047e785a01ef38efea80f92 Mon Sep 17 00:00:00 2001
From: Nico Weber <thakis@chromium.org>
Date: Thu, 16 Nov 2023 08:58:38 -0500
Subject: [PATCH] LibPDF: Show a 'rendering unsupported' error for images with
 /Mask key

---
 Userland/Libraries/LibPDF/CommonNames.h | 1 +
 Userland/Libraries/LibPDF/Renderer.cpp  | 7 +++++++
 2 files changed, 8 insertions(+)

diff --git a/Userland/Libraries/LibPDF/CommonNames.h b/Userland/Libraries/LibPDF/CommonNames.h
index 65b2b6f2bb..d23bdb8987 100644
--- a/Userland/Libraries/LibPDF/CommonNames.h
+++ b/Userland/Libraries/LibPDF/CommonNames.h
@@ -122,6 +122,7 @@
     X(Limits)                     \
     X(Linearized)                 \
     X(ML)                         \
+    X(Mask)                       \
     X(Matrix)                     \
     X(MediaBox)                   \
     X(MissingWidth)               \
diff --git a/Userland/Libraries/LibPDF/Renderer.cpp b/Userland/Libraries/LibPDF/Renderer.cpp
index c528a5d6cd..31d19f0315 100644
--- a/Userland/Libraries/LibPDF/Renderer.cpp
+++ b/Userland/Libraries/LibPDF/Renderer.cpp
@@ -1198,6 +1198,13 @@ PDFErrorOr<void> Renderer::show_image(NonnullRefPtr<StreamObject> image)
                 image_bitmap->set_pixel(i, j, image_color);
             }
         }
+    } else if (image_dict->contains(CommonNames::Mask)) {
+        auto mask_object = TRY(image_dict->get_object(m_document, CommonNames::Mask));
+        if (mask_object->is<StreamObject>()) {
+            return Error::rendering_unsupported_error("/Mask stream objects not yet implemented");
+        } else if (mask_object->is<ArrayObject>()) {
+            return Error::rendering_unsupported_error("/Mask array objects not yet implemented");
+        }
     }
 
     auto image_space = calculate_image_space_transformation(width, height);