/*====================================================================*
 -  Copyright (C) 2001 Leptonica.  All rights reserved.
 -  This software is distributed in the hope that it will be
 -  useful, but with NO WARRANTY OF ANY KIND.
 -  No author or distributor accepts responsibility to anyone for the
 -  consequences of using this software, or for whether it serves any
 -  particular purpose or works at all, unless he or she says so in
 -  writing.  Everyone is granted permission to copy, modify and
 -  redistribute this source code, for commercial or non-commercial
 -  purposes, with the following restrictions: (1) the origin of this
 -  source code must not be misrepresented; (2) modified versions must
 -  be plainly marked as such; and (3) this notice may not be removed
 -  or altered from any source or modified source distribution.
 *====================================================================*/

/*
 *    fliphmtgen.c
 *
 *       DWA implementation of hit-miss transforms with auto-generated sels
 *       for pixOrientDetectDwa() and pixUpDownDetectDwa() in flipdetect.c
 *
 *            PIX             *pixFlipFHMTGen()
 *              static l_int32   flipfhmtgen_low()  -- dispatcher
 *                static void      fhmt_1_0()
 *                static void      fhmt_1_1()
 *                static void      fhmt_1_2()
 *                static void      fhmt_1_3()
 *
 *       The code (rearranged) was generated by prog/flipselgen.c
 */

#include <stdio.h>
#include <string.h>
#include "allheaders.h"

static l_int32   NUM_SELS_GENERATED = 4;
static char  SEL_NAMES[][10] = {"flipsel1",
                                "flipsel2",
                                "flipsel3",
                                "flipsel4"};

static l_int32 flipfhmtgen_low(l_uint32 *, l_int32, l_int32, l_int32, l_uint32 *, l_int32, l_int32);

static void  fhmt_1_0(l_uint32 *, l_int32, l_int32, l_int32, l_uint32 *, l_int32);
static void  fhmt_1_1(l_uint32 *, l_int32, l_int32, l_int32, l_uint32 *, l_int32);
static void  fhmt_1_2(l_uint32 *, l_int32, l_int32, l_int32, l_uint32 *, l_int32);
static void  fhmt_1_3(l_uint32 *, l_int32, l_int32, l_int32, l_uint32 *, l_int32);


/*---------------------------------------------------------------------*
 *                          Top-level hmt functions                    *
 *---------------------------------------------------------------------*/
/*
 *  pixFlipFHMTGen()
 *
 *     Input:  pixd (usual 3 choices: null, == pixs, != pixs)
 *             pixs 
 *             sel name (one of four defined in SEL_NAMES[])
 *     Return: pixd
 *
 *     Action: hit-miss transform on pixs by the sel
 *     N.B.: the sel must have at least one hit, and it
 *           can have any number of misses.
 */
PIX *
pixFlipFHMTGen(PIX   *pixd,
               PIX   *pixs,
               char  *selname)
{
l_int32    i, index, found, w, h, wpls, wpld;
l_uint32  *datad, *datas, *datat;
PIX       *pixt;

    PROCNAME("pixFlipFHMTGen");

    if (!pixs)
        return (PIX *)ERROR_PTR("pixs not defined", procName, pixd);
    if (pixGetDepth(pixs) != 1)
        return (PIX *)ERROR_PTR("pixs must be 1 bpp", procName, pixd);

    found = FALSE;
    for (i = 0; i < NUM_SELS_GENERATED; i++) {
        if (strcmp(selname, SEL_NAMES[i]) == 0) {
            found = TRUE;
            index = i;
            break;
        }
    }
    if (found == FALSE)
        return (PIX *)ERROR_PTR("sel index not found", procName, pixd);

    if (pixd) {
        if (!pixSizesEqual(pixs, pixd))
            return (PIX *)ERROR_PTR("sizes not equal", procName, pixd);
    }
    else {
        if ((pixd = pixCreateTemplate(pixs)) == NULL)
            return (PIX *)ERROR_PTR("pixd not made", procName, NULL);
    }

    wpls = pixGetWpl(pixs);
    wpld = pixGetWpl(pixd);

        /*  The images must be surrounded with ADDED_BORDER white pixels,
         *  that we'll read from.  We fabricate a "proper"
         *  image as the subimage within the border, having the 
         *  following parameters:  */
    w = pixGetWidth(pixs) - 2 * ADDED_BORDER;
    h = pixGetHeight(pixs) - 2 * ADDED_BORDER;
    datas = pixGetData(pixs) + ADDED_BORDER * wpls + ADDED_BORDER / 32;
    datad = pixGetData(pixd) + ADDED_BORDER * wpld + ADDED_BORDER / 32;

    if (pixd == pixs) {  /* need temp image if in-place */
        if ((pixt = pixCopy(NULL, pixs)) == NULL)
            return (PIX *)ERROR_PTR("pixt not made", procName, pixd);
        datat = pixGetData(pixt) + ADDED_BORDER * wpls + ADDED_BORDER / 32;
        flipfhmtgen_low(datad, w, h, wpld, datat, wpls, index);
        pixDestroy(&pixt);
    }
    else {  /* simple and not in-place */
        flipfhmtgen_low(datad, w, h, wpld, datas, wpls, index);
    }

    return pixd;
}


/*---------------------------------------------------------------------*
 *                           Fast hmt dispatcher                       *
 *---------------------------------------------------------------------*/
/*
 *  flipfhmtgen_low()
 *
 *       A dispatcher to appropriate low-level code for flip hmt ops
 */
static l_int32
flipfhmtgen_low(l_uint32  *datad,
                l_int32    w,
                l_int32    h,
                l_int32    wpld,
                l_uint32  *datas,
                l_int32    wpls,
                l_int32    index)
{

    switch (index)
    {
    case 0:
        fhmt_1_0(datad, w, h, wpld, datas, wpls);
        break;
    case 1:
        fhmt_1_1(datad, w, h, wpld, datas, wpls);
        break;
    case 2:
        fhmt_1_2(datad, w, h, wpld, datas, wpls);
        break;
    case 3:
        fhmt_1_3(datad, w, h, wpld, datas, wpls);
        break;
    }

    return 0;
}


/*--------------------------------------------------------------------------*
 *                  Low-level auto-generated hmt routines                   *
 *--------------------------------------------------------------------------*/
/*
 *  N.B.  in all the low-level routines, the part of the image
 *        that is accessed has been clipped by ADDED_BORDER pixels
 *        on all four sides.  This is done in the higher level
 *        code by redefining w and h smaller and by moving the
 *        start-of-image pointers up to the beginning of this
 *        interior rectangle.
 */

static void
fhmt_1_0(l_uint32  *datad,
         l_int32    w,
         l_int32    h,
         l_int32    wpld,
         l_uint32  *datas,
         l_int32    wpls)
{
l_int32              i;
register l_int32     j, pwpls;
register l_uint32   *sptr, *dptr;
l_int32              wpls2, wpls3;
    
    wpls2 = 2 * wpls;
    wpls3 = 3 * wpls;
    pwpls = (l_uint32)(w + 31) / 32;  /* proper wpl of src */

    for (i = 0; i < h; i++) {
        sptr = datas + i * wpls;
        dptr = datad + i * wpld;
        for (j = 0; j < pwpls; j++, sptr++, dptr++) {
            *dptr = ((*(sptr - wpls) >> 3) | (*(sptr - wpls - 1) << 29)) &
                    (~*(sptr - wpls)) &
                    ((~*(sptr - wpls) << 1) | (~*(sptr - wpls + 1) >> 31)) &
                    ((*(sptr) >> 3) | (*(sptr - 1) << 29)) &
                    ((~*(sptr) >> 1) | (~*(sptr - 1) << 31)) &
                    (~*sptr) &
                    ((~*(sptr) << 1) | (~*(sptr + 1) >> 31)) &
                    ((*(sptr + wpls) >> 3) | (*(sptr + wpls - 1) << 29)) &
                    (~*(sptr + wpls)) &
                    ((*(sptr + wpls2) >> 3) | (*(sptr + wpls2 - 1) << 29)) &
                    ((*(sptr + wpls3) >> 3) | (*(sptr + wpls3 - 1) << 29)) &
                    ((*(sptr + wpls3) >> 2) | (*(sptr + wpls3 - 1) << 30)) &
                    ((*(sptr + wpls3) >> 1) | (*(sptr + wpls3 - 1) << 31)) &
                    (*(sptr + wpls3)) &
                    ((*(sptr + wpls3) << 1) | (*(sptr + wpls3 + 1) >> 31)) &
                    ((*(sptr + wpls3) << 2) | (*(sptr + wpls3 + 1) >> 30));
        }
    }
}


static void
fhmt_1_1(l_uint32  *datad,
         l_int32    w,
         l_int32    h,
         l_int32    wpld,
         l_uint32  *datas,
         l_int32    wpls)
{
l_int32              i;
register l_int32     j, pwpls;
register l_uint32   *sptr, *dptr;
l_int32              wpls2, wpls3;
    
    wpls2 = 2 * wpls;
    wpls3 = 3 * wpls;
    pwpls = (l_uint32)(w + 31) / 32;  /* proper wpl of src */

    for (i = 0; i < h; i++) {
        sptr = datas + i * wpls;
        dptr = datad + i * wpld;
        for (j = 0; j < pwpls; j++, sptr++, dptr++) {
            *dptr = ((~*(sptr - wpls) >> 1) | (~*(sptr - wpls - 1) << 31)) &
                    (~*(sptr - wpls)) &
                    ((*(sptr - wpls) << 3) | (*(sptr - wpls + 1) >> 29)) &
                    ((~*(sptr) >> 1) | (~*(sptr - 1) << 31)) &
                    (~*sptr) &
                    ((~*(sptr) << 1) | (~*(sptr + 1) >> 31)) &
                    ((*(sptr) << 3) | (*(sptr + 1) >> 29)) &
                    (~*(sptr + wpls)) &
                    ((*(sptr + wpls) << 3) | (*(sptr + wpls + 1) >> 29)) &
                    ((*(sptr + wpls2) << 3) | (*(sptr + wpls2 + 1) >> 29)) &
                    ((*(sptr + wpls3) >> 2) | (*(sptr + wpls3 - 1) << 30)) &
                    ((*(sptr + wpls3) >> 1) | (*(sptr + wpls3 - 1) << 31)) &
                    (*(sptr + wpls3)) &
                    ((*(sptr + wpls3) << 1) | (*(sptr + wpls3 + 1) >> 31)) &
                    ((*(sptr + wpls3) << 2) | (*(sptr + wpls3 + 1) >> 30)) &
                    ((*(sptr + wpls3) << 3) | (*(sptr + wpls3 + 1) >> 29));
        }
    }
}


static void
fhmt_1_2(l_uint32  *datad,
         l_int32    w,
         l_int32    h,
         l_int32    wpld,
         l_uint32  *datas,
         l_int32    wpls)
{
l_int32              i;
register l_int32     j, pwpls;
register l_uint32   *sptr, *dptr;
l_int32              wpls2, wpls3;
    
    wpls2 = 2 * wpls;
    wpls3 = 3 * wpls;
    pwpls = (l_uint32)(w + 31) / 32;  /* proper wpl of src */

    for (i = 0; i < h; i++) {
        sptr = datas + i * wpls;
        dptr = datad + i * wpld;
        for (j = 0; j < pwpls; j++, sptr++, dptr++) {
            *dptr = ((*(sptr - wpls3) >> 3) | (*(sptr - wpls3 - 1) << 29)) &
                    ((*(sptr - wpls3) >> 2) | (*(sptr - wpls3 - 1) << 30)) &
                    ((*(sptr - wpls3) >> 1) | (*(sptr - wpls3 - 1) << 31)) &
                    (*(sptr - wpls3)) &
                    ((*(sptr - wpls3) << 1) | (*(sptr - wpls3 + 1) >> 31)) &
                    ((*(sptr - wpls3) << 2) | (*(sptr - wpls3 + 1) >> 30)) &
                    ((*(sptr - wpls2) >> 3) | (*(sptr - wpls2 - 1) << 29)) &
                    ((*(sptr - wpls) >> 3) | (*(sptr - wpls - 1) << 29)) &
                    (~*(sptr - wpls)) &
                    ((*(sptr) >> 3) | (*(sptr - 1) << 29)) &
                    ((~*(sptr) >> 1) | (~*(sptr - 1) << 31)) &
                    (~*sptr) &
                    ((~*(sptr) << 1) | (~*(sptr + 1) >> 31)) &
                    ((*(sptr + wpls) >> 3) | (*(sptr + wpls - 1) << 29)) &
                    (~*(sptr + wpls)) &
                    ((~*(sptr + wpls) << 1) | (~*(sptr + wpls + 1) >> 31));
        }
    }
}


static void
fhmt_1_3(l_uint32  *datad,
         l_int32    w,
         l_int32    h,
         l_int32    wpld,
         l_uint32  *datas,
         l_int32    wpls)
{
l_int32              i;
register l_int32     j, pwpls;
register l_uint32   *sptr, *dptr;
l_int32              wpls2, wpls3;
    
    wpls2 = 2 * wpls;
    wpls3 = 3 * wpls;
    pwpls = (l_uint32)(w + 31) / 32;  /* proper wpl of src */

    for (i = 0; i < h; i++) {
        sptr = datas + i * wpls;
        dptr = datad + i * wpld;
        for (j = 0; j < pwpls; j++, sptr++, dptr++) {
            *dptr = ((*(sptr - wpls3) >> 2) | (*(sptr - wpls3 - 1) << 30)) &
                    ((*(sptr - wpls3) >> 1) | (*(sptr - wpls3 - 1) << 31)) &
                    (*(sptr - wpls3)) &
                    ((*(sptr - wpls3) << 1) | (*(sptr - wpls3 + 1) >> 31)) &
                    ((*(sptr - wpls3) << 2) | (*(sptr - wpls3 + 1) >> 30)) &
                    ((*(sptr - wpls3) << 3) | (*(sptr - wpls3 + 1) >> 29)) &
                    ((*(sptr - wpls2) << 3) | (*(sptr - wpls2 + 1) >> 29)) &
                    (~*(sptr - wpls)) &
                    ((*(sptr - wpls) << 3) | (*(sptr - wpls + 1) >> 29)) &
                    ((~*(sptr) >> 1) | (~*(sptr - 1) << 31)) &
                    (~*sptr) &
                    ((~*(sptr) << 1) | (~*(sptr + 1) >> 31)) &
                    ((*(sptr) << 3) | (*(sptr + 1) >> 29)) &
                    ((~*(sptr + wpls) >> 1) | (~*(sptr + wpls - 1) << 31)) &
                    (~*(sptr + wpls)) &
                    ((*(sptr + wpls) << 3) | (*(sptr + wpls + 1) >> 29));
        }
    }
}


