1 files changed, 83 insertions, 0 deletions
diff --git a/source/pdf/pdf-pattern.c b/source/pdf/pdf-pattern.c
new file mode 100644
index 00000000..622705b2
--- /dev/null
+++ b/source/pdf/pdf-pattern.c
@@ -0,0 +1,83 @@
+#include "mupdf/pdf.h"
+
+pdf_pattern *
+pdf_keep_pattern(fz_context *ctx, pdf_pattern *pat)
+{
+	return (pdf_pattern *)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_free_pattern_imp(fz_context *ctx, fz_storable *pat_)
+{
+	pdf_pattern *pat = (pdf_pattern *)pat_;
+
+	if (pat->resources)
+		pdf_drop_obj(pat->resources);
+	if (pat->contents)
+		pdf_drop_obj(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(pdf_document *xref, pdf_obj *dict)
+{
+	pdf_pattern *pat;
+	pdf_obj *obj;
+	fz_context *ctx = xref->ctx;
+
+	if ((pat = pdf_find_item(ctx, pdf_free_pattern_imp, dict)))
+	{
+		return pat;
+	}
+
+	pat = fz_malloc_struct(ctx, pdf_pattern);
+	FZ_INIT_STORABLE(pat, 1, pdf_free_pattern_imp);
+	pat->resources = NULL;
+	pat->contents = NULL;
+
+	/* 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_to_int(pdf_dict_gets(dict, "PaintType")) == 2;
+	pat->xstep = pdf_to_real(pdf_dict_gets(dict, "XStep"));
+	pat->ystep = pdf_to_real(pdf_dict_gets(dict, "YStep"));
+
+	obj = pdf_dict_gets(dict, "BBox");
+	pdf_to_rect(ctx, obj, &pat->bbox);
+
+	obj = pdf_dict_gets(dict, "Matrix");
+	if (obj)
+		pdf_to_matrix(ctx, obj, &pat->matrix);
+	else
+		pat->matrix = fz_identity;
+
+	pat->resources = pdf_dict_gets(dict, "Resources");
+	if (pat->resources)
+		pdf_keep_obj(pat->resources);
+
+	fz_try(ctx)
+	{
+		pat->contents = pdf_keep_obj(dict);
+	}
+	fz_catch(ctx)
+	{
+		pdf_remove_item(ctx, pdf_free_pattern_imp, dict);
+		pdf_drop_pattern(ctx, pat);
+		fz_rethrow_message(ctx, "cannot load pattern stream (%d %d R)", pdf_to_num(dict), pdf_to_gen(dict));
+	}
+	return pat;
+}