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diff --git a/gs/src/gsimage.h b/gs/src/gsimage.h
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+/* Copyright (C) 1992, 1995, 1996 Aladdin Enterprises.  All rights reserved.
+  
+  This file is part of Aladdin Ghostscript.
+  
+  Aladdin Ghostscript is distributed with NO WARRANTY OF ANY KIND.  No author
+  or distributor accepts any responsibility for the consequences of using it,
+  or for whether it serves any particular purpose or works at all, unless he
+  or she says so in writing.  Refer to the Aladdin Ghostscript Free Public
+  License (the "License") for full details.
+  
+  Every copy of Aladdin Ghostscript must include a copy of the License,
+  normally in a plain ASCII text file named PUBLIC.  The License grants you
+  the right to copy, modify and redistribute Aladdin Ghostscript, but only
+  under certain conditions described in the License.  Among other things, the
+  License requires that the copyright notice and this notice be preserved on
+  all copies.
+*/
+
+/* gsimage.h */
+/* Client interface to image painting */
+/* Requires gsstate.h */
+#include "gsiparam.h"
+
+/*
+ * The image painting interface uses an enumeration style:
+ * the client initializes an enumerator, then supplies data incrementally.
+ */
+typedef struct gs_image_enum_s gs_image_enum;
+gs_image_enum *gs_image_enum_alloc(P2(gs_memory_t *, client_name_t));
+/*
+ * image_init returns 1 for an empty image, 0 normally, <0 on error.
+ * Note that image_init serves for both image and imagemask,
+ * depending on the value of ImageMask in the image structure.
+ */
+int gs_image_init(P4(gs_image_enum *penum, const gs_image_t *pim,
+		     bool MultipleDataSources, gs_state *pgs));
+int gs_image_next(P4(gs_image_enum *penum, const byte *dbytes,
+		     uint dsize, uint *pused));
+/*
+ * Return the number of bytes of data per row
+ * (per plane, if MultipleDataSources is true).
+ */
+uint gs_image_bytes_per_row(P1(const gs_image_enum *penum));
+/* Clean up after processing an image. */
+void gs_image_cleanup(P1(gs_image_enum *penum));