1 files changed, 53 insertions, 0 deletions
diff --git a/tree/blend.c b/tree/blend.c
new file mode 100644
index 00000000..d2154240
--- /dev/null
+++ b/tree/blend.c
@@ -0,0 +1,53 @@
+#include <fitz.h>
+
+fz_error *
+fz_newblend(fz_node **nodep, fz_blendkind b, int k, int i)
+{
+	fz_blend *node;
+
+	node = fz_malloc(sizeof (fz_blend));
+	if (!node)
+		return fz_outofmem;
+	*nodep = (fz_node*)node;
+
+	fz_initnode((fz_node*)node, FZ_NBLEND);
+	node->child = nil;
+	node->mode = b;
+	node->knockout = k;
+	node->isolated = i;
+
+	return nil;
+}
+
+void
+fz_freeblend(fz_blend *node)
+{
+	if (node->child)
+		fz_freenode(node->child);
+	fz_free(node);
+}
+
+fz_rect
+fz_boundblend(fz_blend *node, fz_matrix ctm)
+{
+	fz_node *child;
+	fz_rect bbox;
+	fz_rect r;
+
+	bbox = FZ_INFRECT;
+
+	for (child = node->child; child; child = child->next)
+	{
+		r = fz_boundnode(child, ctm);
+		if (r.max.x >= r.min.x)
+		{
+			if (bbox.max.x >= bbox.min.x)
+				bbox = fz_mergerects(r, bbox);
+			else
+				bbox = r;
+		}   
+	}
+
+	return bbox;
+}
+