--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/mupdf-source/thirdparty/leptonica/src/ccbord_internal.h	Mon Sep 15 11:44:09 2025 +0200
@@ -0,0 +1,107 @@
+/*====================================================================*
+ -  Copyright (C) 2001 Leptonica.  All rights reserved.
+ -
+ -  Redistribution and use in source and binary forms, with or without
+ -  modification, are permitted provided that the following conditions
+ -  are met:
+ -  1. Redistributions of source code must retain the above copyright
+ -     notice, this list of conditions and the following disclaimer.
+ -  2. Redistributions in binary form must reproduce the above
+ -     copyright notice, this list of conditions and the following
+ -     disclaimer in the documentation and/or other materials
+ -     provided with the distribution.
+ -
+ -  THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ -  ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ -  LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+ -  A PARTICULAR PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL ANY
+ -  CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
+ -  EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
+ -  PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
+ -  PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
+ -  OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
+ -  NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
+ -  SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ *====================================================================*/
+
+#ifndef  LEPTONICA_CCBORD_INTERNAL_H
+#define  LEPTONICA_CCBORD_INTERNAL_H
+
+/*!
+ * \file ccbord_internal.h
+ *
+ * <pre>
+ *
+ *    This file is internal; it is not part of the public interface.
+ *    It contains definitions of data structures that use border pixels
+ *    of connected components to represent the foreground pixels
+ *    in an image by the border
+ *
+ *        CCBord:   represents a single connected component
+ *        CCBorda:  an array of CCBord
+ *
+ *    The CCBord contains:
+ *
+ *    (1) a minimally-clipped bitmap of the component (pix),
+ *    (2) a boxa consisting of:
+ *          for the primary component:
+ *                (xul, yul) pixel location in global coords
+ *                (w, h) of the bitmap
+ *          for the hole components:
+ *                (x, y) in relative coordinates in primary component
+ *                (w, h) of the hole border (which is 2 pixels
+ *                       larger in each direction than the hole itself)
+ *    (3) a pta ('start') of the initial border pixel location for each
+ *        closed curve, all in relative coordinates of the primary
+ *        component.  This is given for the primary component,
+ *        followed by the hole components, if any.
+ *    (4) a refcount of the ccbord; used internally when a ccbord
+ *        is accessed from a ccborda (array of ccbord)
+ *    (5) a ptaa for the chain code for the border in relative
+ *        coordinates, where the first pta is the exterior border
+ *        and all other pta are for interior borders (holes)
+ *    (6) a ptaa for the global pixel loc rendition of the border,
+ *        where the first pta is the exterior border and all other
+ *        pta are for interior borders (holes).
+ *        This is derived from the local or step chain code.
+ *    (7) a numaa for the chain code for the border as orientation
+ *        directions between successive border pixels, where
+ *        the first numa is the exterior border and all other
+ *        numa are for interior borders (holes).  This is derived
+ *        from the local chain code.  The 8 directions are 0 - 7.
+ *    (8) a pta for a single chain for each c.c., comprised of outer
+ *        and hole borders, plus cut paths between them, all in
+ *        local coords.
+ *    (9) a pta for a single chain for each c.c., comprised of outer
+ *        and hole borders, plus cut paths between them, all in
+ *        global coords.
+ * </pre>
+ */
+
+/*! A single CCBord for a connected component */
+struct CCBord
+{
+    struct Pix          *pix;          /*!< component bitmap (min size)      */
+    struct Boxa         *boxa;         /*!< regions of each closed curve     */
+    struct Pta          *start;        /*!< initial border pixel locations   */
+    l_atomic             refcount;     /*!< number of handles; start at 1    */
+    struct Ptaa         *local;        /*!< ptaa of chain pixels (local)     */
+    struct Ptaa         *global;       /*!< ptaa of chain pixels (global)    */
+    struct Numaa        *step;         /*!< numaa of chain code (step dir)   */
+    struct Pta          *splocal;      /*!< pta of single chain (local)      */
+    struct Pta          *spglobal;     /*!< pta of single chain (global)     */
+};
+
+/*! Array of CCBord */
+struct CCBorda
+{
+    struct Pix          *pix;          /*!< input pix (may be null)          */
+    l_int32              w;            /*!< width of pix                     */
+    l_int32              h;            /*!< height of pix                    */
+    l_int32              n;            /*!< number of ccbord in ptr array    */
+    l_int32              nalloc;       /*!< number of ccbord ptrs allocated  */
+    struct CCBord      **ccb;          /*!< ccb ptr array                    */
+};
+
+#endif  /* LEPTONICA_CCBORD_INTERNAL_H */
+