--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/mupdf-source/source/pdf/pdf-pattern.c	Mon Sep 15 11:43:07 2025 +0200
@@ -0,0 +1,96 @@
+// Copyright (C) 2004-2021 Artifex Software, Inc.
+//
+// This file is part of MuPDF.
+//
+// MuPDF is free software: you can redistribute it and/or modify it under the
+// terms of the GNU Affero General Public License as published by the Free
+// Software Foundation, either version 3 of the License, or (at your option)
+// any later version.
+//
+// MuPDF is distributed in the hope that it will be useful, but WITHOUT ANY
+// WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
+// FOR A PARTICULAR PURPOSE. See the GNU Affero General Public License for more
+// details.
+//
+// You should have received a copy of the GNU Affero General Public License
+// along with MuPDF. If not, see <https://www.gnu.org/licenses/agpl-3.0.en.html>
+//
+// Alternative licensing terms are available from the licensor.
+// For commercial licensing, see <https://www.artifex.com/> or contact
+// Artifex Software, Inc., 39 Mesa Street, Suite 108A, San Francisco,
+// CA 94129, USA, for further information.
+
+#include "mupdf/fitz.h"
+#include "mupdf/pdf.h"
+
+pdf_pattern *
+pdf_keep_pattern(fz_context *ctx, pdf_pattern *pat)
+{
+	return fz_keep_storable(ctx, &pat->storable);
+}
+
+void
+pdf_drop_pattern(fz_context *ctx, pdf_pattern *pat)
+{
+	fz_drop_storable(ctx, &pat->storable);
+}
+
+static void
+pdf_drop_pattern_imp(fz_context *ctx, fz_storable *pat_)
+{
+	pdf_pattern *pat = (pdf_pattern *)pat_;
+	pdf_drop_obj(ctx, pat->resources);
+	pdf_drop_obj(ctx, pat->contents);
+	fz_free(ctx, pat);
+}
+
+static unsigned int
+pdf_pattern_size(pdf_pattern *pat)
+{
+	if (pat == NULL)
+		return 0;
+	return sizeof(*pat);
+}
+
+pdf_pattern *
+pdf_load_pattern(fz_context *ctx, pdf_document *doc, pdf_obj *dict)
+{
+	pdf_pattern *pat;
+
+	if ((pat = pdf_find_item(ctx, pdf_drop_pattern_imp, dict)) != NULL)
+	{
+		return pat;
+	}
+
+	pat = fz_malloc_struct(ctx, pdf_pattern);
+	FZ_INIT_STORABLE(pat, 1, pdf_drop_pattern_imp);
+	pat->document = doc;
+	pat->resources = NULL;
+	pat->contents = NULL;
+	pat->id = pdf_to_num(ctx, dict);
+
+	fz_try(ctx)
+	{
+		/* Store pattern now, to avoid possible recursion if objects refer back to this one */
+		pdf_store_item(ctx, dict, pat, pdf_pattern_size(pat));
+
+		pat->ismask = pdf_dict_get_int(ctx, dict, PDF_NAME(PaintType)) == 2;
+		pat->xstep = pdf_dict_get_real(ctx, dict, PDF_NAME(XStep));
+		pat->ystep = pdf_dict_get_real(ctx, dict, PDF_NAME(YStep));
+		pat->bbox = pdf_dict_get_rect(ctx, dict, PDF_NAME(BBox));
+		pat->matrix = pdf_dict_get_matrix(ctx, dict, PDF_NAME(Matrix));
+
+		pat->resources = pdf_dict_get(ctx, dict, PDF_NAME(Resources));
+		if (pat->resources)
+			pdf_keep_obj(ctx, pat->resources);
+
+		pat->contents = pdf_keep_obj(ctx, dict);
+	}
+	fz_catch(ctx)
+	{
+		pdf_remove_item(ctx, pdf_drop_pattern_imp, dict);
+		pdf_drop_pattern(ctx, pat);
+		fz_rethrow(ctx);
+	}
+	return pat;
+}