pixacc.c

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/*====================================================================*
 -  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.
 *====================================================================*/


#include "allheaders.h"


/*---------------------------------------------------------------------*
 *                     Pixacc creation, destruction                    *
 *---------------------------------------------------------------------*/
PIXACC *
pixaccCreate(l_int32  w,
             l_int32  h,
             l_int32  negflag)
{
PIXACC  *pixacc;

    PROCNAME("pixaccCreate");

    if ((pixacc = (PIXACC *)LEPT_CALLOC(1, sizeof(PIXACC))) == NULL)
        return (PIXACC *)ERROR_PTR("pixacc not made", procName, NULL);
    pixacc->w = w;
    pixacc->h = h;

    if ((pixacc->pix = pixCreate(w, h, 32)) == NULL) {
        pixaccDestroy(&pixacc);
        return (PIXACC *)ERROR_PTR("pix not made", procName, NULL);
    }

    if (negflag) {
        pixacc->offset = 0x40000000;
        pixSetAllArbitrary(pixacc->pix, pixacc->offset);
    }

    return pixacc;
}


PIXACC *
pixaccCreateFromPix(PIX     *pix,
                    l_int32  negflag)
{
l_int32  w, h;
PIXACC  *pixacc;

    PROCNAME("pixaccCreateFromPix");

    if (!pix)
        return (PIXACC *)ERROR_PTR("pix not defined", procName, NULL);

    pixGetDimensions(pix, &w, &h, NULL);
    pixacc = pixaccCreate(w, h, negflag);
    pixaccAdd(pixacc, pix);
    return pixacc;
}


void
pixaccDestroy(PIXACC  **ppixacc)
{
PIXACC  *pixacc;

    PROCNAME("pixaccDestroy");

    if (ppixacc == NULL) {
        L_WARNING("ptr address is NULL!", procName);
        return;
    }

    if ((pixacc = *ppixacc) == NULL)
        return;

    pixDestroy(&pixacc->pix);
    LEPT_FREE(pixacc);
    *ppixacc = NULL;
    return;
}


/*---------------------------------------------------------------------*
 *                            Pixacc finalization                      *
 *---------------------------------------------------------------------*/
PIX *
pixaccFinal(PIXACC  *pixacc,
            l_int32  outdepth)
{
    PROCNAME("pixaccFinal");

    if (!pixacc)
        return (PIX *)ERROR_PTR("pixacc not defined", procName, NULL);

    return pixFinalAccumulate(pixaccGetPix(pixacc), pixaccGetOffset(pixacc),
                              outdepth);
}


/*---------------------------------------------------------------------*
 *                            Pixacc accessors                         *
 *---------------------------------------------------------------------*/
PIX *
pixaccGetPix(PIXACC  *pixacc)
{
    PROCNAME("pixaccGetPix");

    if (!pixacc)
        return (PIX *)ERROR_PTR("pixacc not defined", procName, NULL);
    return pixacc->pix;
}


l_int32
pixaccGetOffset(PIXACC  *pixacc)
{
    PROCNAME("pixaccGetOffset");

    if (!pixacc)
        return ERROR_INT("pixacc not defined", procName, -1);
    return pixacc->offset;
}


/*---------------------------------------------------------------------*
 *                          Pixacc accumulators                        *
 *---------------------------------------------------------------------*/
l_ok
pixaccAdd(PIXACC  *pixacc,
          PIX     *pix)
{
    PROCNAME("pixaccAdd");

    if (!pixacc)
        return ERROR_INT("pixacc not defined", procName, 1);
    if (!pix)
        return ERROR_INT("pix not defined", procName, 1);
    pixAccumulate(pixaccGetPix(pixacc), pix, L_ARITH_ADD);
    return 0;
}


l_ok
pixaccSubtract(PIXACC  *pixacc,
               PIX     *pix)
{
    PROCNAME("pixaccSubtract");

    if (!pixacc)
        return ERROR_INT("pixacc not defined", procName, 1);
    if (!pix)
        return ERROR_INT("pix not defined", procName, 1);
    pixAccumulate(pixaccGetPix(pixacc), pix, L_ARITH_SUBTRACT);
    return 0;
}


l_ok
pixaccMultConst(PIXACC    *pixacc,
                l_float32  factor)
{
    PROCNAME("pixaccMultConst");

    if (!pixacc)
        return ERROR_INT("pixacc not defined", procName, 1);
    pixMultConstAccumulate(pixaccGetPix(pixacc), factor,
                           pixaccGetOffset(pixacc));
    return 0;
}


l_ok
pixaccMultConstAccumulate(PIXACC    *pixacc,
                          PIX       *pix,
                          l_float32  factor)
{
l_int32  w, h, d, negflag;
PIX     *pixt;
PIXACC  *pacct;

    PROCNAME("pixaccMultConstAccumulate");

    if (!pixacc)
        return ERROR_INT("pixacc not defined", procName, 1);
    if (!pix)
        return ERROR_INT("pix not defined", procName, 1);

    if (factor == 0.0) return 0;

    pixGetDimensions(pix, &w, &h, &d);
    negflag = (factor > 0.0) ? 0 : 1;
    pacct = pixaccCreate(w, h, negflag);
    pixaccAdd(pacct, pix);
    pixaccMultConst(pacct, factor);
    pixt = pixaccFinal(pacct, d);
    pixaccAdd(pixacc, pixt);

    pixaccDestroy(&pacct);
    pixDestroy(&pixt);
    return 0;
}