--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/mupdf-source/thirdparty/leptonica/src/morph.h	Mon Sep 15 11:43:07 2025 +0200
@@ -0,0 +1,225 @@
+/*====================================================================*
+ -  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_MORPH_H
+#define  LEPTONICA_MORPH_H
+
+/*!
+ * \file morph.h
+ *
+ * <pre>
+ *  Contains the following structs:
+ *      struct Sel
+ *      struct Sela
+ *      struct Kernel
+ *
+ *  Contains definitions for:
+ *      morphological b.c. flags
+ *      structuring element types
+ *      runlength flags for granulometry
+ *      direction flags for grayscale morphology
+ *      morphological operation flags
+ *      standard border size
+ *      grayscale intensity scaling flags
+ *      morphological tophat flags
+ *      arithmetic and logical operator flags
+ *      grayscale morphology selection flags
+ *      distance function b.c. flags
+ *      image comparison flags
+ * </pre>
+ */
+
+/*-------------------------------------------------------------------------*
+ *                             Sel and Sel array                           *
+ *-------------------------------------------------------------------------*/
+#define  SEL_VERSION_NUMBER    1
+
+/*! Selection */
+struct Sel
+{
+    l_int32       sy;        /*!< sel height                               */
+    l_int32       sx;        /*!< sel width                                */
+    l_int32       cy;        /*!< y location of sel origin                 */
+    l_int32       cx;        /*!< x location of sel origin                 */
+    l_int32     **data;      /*!< {0,1,2}; data[i][j] in [row][col] order  */
+    char         *name;      /*!< used to find sel by name                 */
+};
+typedef struct Sel SEL;
+
+/*! Array of Sel */
+struct Sela
+{
+    l_int32          n;       /*!< number of sel actually stored           */
+    l_int32          nalloc;  /*!< size of allocated ptr array             */
+    struct Sel     **sel;     /*!< sel ptr array                           */
+};
+typedef struct Sela SELA;
+
+
+/*-------------------------------------------------------------------------*
+ *                                 Kernel                                  *
+ *-------------------------------------------------------------------------*/
+#define  KERNEL_VERSION_NUMBER    2
+
+/*! Kernel */
+struct L_Kernel
+{
+    l_int32       sy;        /*!< kernel height                            */
+    l_int32       sx;        /*!< kernel width                             */
+    l_int32       cy;        /*!< y location of kernel origin              */
+    l_int32       cx;        /*!< x location of kernel origin              */
+    l_float32   **data;      /*!< data[i][j] in [row][col] order           */
+};
+typedef struct L_Kernel  L_KERNEL;
+
+
+/*-------------------------------------------------------------------------*
+ *                 Morphological boundary condition flags                  *
+ *                                                                         *
+ *  Two types of boundary condition for erosion.                           *
+ *  The global variable MORPH_BC takes on one of these two values.         *
+ *  See notes in morph.c for usage.                                        *
+ *-------------------------------------------------------------------------*/
+/*! Morph Boundary */
+enum {
+    SYMMETRIC_MORPH_BC = 0,
+    ASYMMETRIC_MORPH_BC = 1
+};
+
+/*-------------------------------------------------------------------------*
+ *                        Structuring element vals                         *
+ *-------------------------------------------------------------------------*/
+/*! SEL Vals */
+enum {
+    SEL_DONT_CARE  = 0,
+    SEL_HIT        = 1,
+    SEL_MISS       = 2
+};
+
+/*-------------------------------------------------------------------------*
+ *                  Runlength flags for granulometry                       *
+ *-------------------------------------------------------------------------*/
+/*! Runlength Polarity */
+enum {
+    L_RUN_OFF = 0,
+    L_RUN_ON  = 1
+};
+
+/*-------------------------------------------------------------------------*
+ *         Direction flags for grayscale morphology, granulometry,         *
+ *                 composable Sels, convolution, etc.                      *
+ *-------------------------------------------------------------------------*/
+/*! Direction Flags */
+enum {
+    L_HORIZ            = 1,
+    L_VERT             = 2,
+    L_BOTH_DIRECTIONS  = 3
+};
+
+/*-------------------------------------------------------------------------*
+ *                   Morphological operation flags                         *
+ *-------------------------------------------------------------------------*/
+/*! Morph Operator */
+enum {
+    L_MORPH_DILATE    = 1,
+    L_MORPH_ERODE     = 2,
+    L_MORPH_OPEN      = 3,
+    L_MORPH_CLOSE     = 4,
+    L_MORPH_HMT       = 5
+};
+
+/*-------------------------------------------------------------------------*
+ *                    Grayscale intensity scaling flags                    *
+ *-------------------------------------------------------------------------*/
+/*! Pixel Value Scaling */
+enum {
+    L_LINEAR_SCALE  = 1,
+    L_LOG_SCALE     = 2
+};
+
+/*-------------------------------------------------------------------------*
+ *                      Morphological tophat flags                         *
+ *-------------------------------------------------------------------------*/
+/*! Morph Tophat */
+enum {
+    L_TOPHAT_WHITE = 0,
+    L_TOPHAT_BLACK = 1
+};
+
+/*-------------------------------------------------------------------------*
+ *                Arithmetic and logical operator flags                    *
+ *                 (use on grayscale images and Numas)                     *
+ *-------------------------------------------------------------------------*/
+/*! ArithLogical Ops */
+enum {
+    L_ARITH_ADD       = 1,
+    L_ARITH_SUBTRACT  = 2,
+    L_ARITH_MULTIPLY  = 3,   /* on numas only */
+    L_ARITH_DIVIDE    = 4,   /* on numas only */
+    L_UNION           = 5,   /* on numas only */
+    L_INTERSECTION    = 6,   /* on numas only */
+    L_SUBTRACTION     = 7,   /* on numas only */
+    L_EXCLUSIVE_OR    = 8    /* on numas only */
+};
+
+/*-------------------------------------------------------------------------*
+ *                        Min/max selection flags                          *
+ *-------------------------------------------------------------------------*/
+/*! MinMax Selection */
+enum {
+    L_CHOOSE_MIN = 1,         /* useful in a downscaling "erosion"       */
+    L_CHOOSE_MAX = 2,         /* useful in a downscaling "dilation"      */
+    L_CHOOSE_MAXDIFF = 3,     /* useful in a downscaling contrast        */
+    L_CHOOSE_MIN_BOOST = 4,   /* use a modification of the min value     */
+    L_CHOOSE_MAX_BOOST = 5    /* use a modification of the max value     */
+};
+
+/*-------------------------------------------------------------------------*
+ *            Exterior value b.c. for distance function flags              *
+ *-------------------------------------------------------------------------*/
+/*! Exterior Value */
+enum {
+    L_BOUNDARY_BG = 1,  /* assume bg outside image */
+    L_BOUNDARY_FG = 2   /* assume fg outside image */
+};
+
+/*-------------------------------------------------------------------------*
+ *                         Image comparison flags                          *
+ *-------------------------------------------------------------------------*/
+/*! Image Comparison */
+enum {
+    L_COMPARE_XOR = 1,
+    L_COMPARE_SUBTRACT = 2,
+    L_COMPARE_ABS_DIFF = 3
+};
+
+/*-------------------------------------------------------------------------*
+ *    Standard size of border added around images for special processing   *
+ *-------------------------------------------------------------------------*/
+static const l_int32  ADDED_BORDER = 32;   /*!< pixels, not bits */
+
+
+#endif  /* LEPTONICA_MORPH_H */