rop.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.
 *====================================================================*/
 
#ifdef HAVE_CONFIG_H
#include <config_auto.h>
#endif  /* HAVE_CONFIG_H */
 
#include <string.h>
#include "allheaders.h"
 
static l_int32 checkRasteropCrop(l_int32 pixw, l_int32 pixh, l_int32 dx,
                                 l_int32 dy, l_int32 dw, l_int32 dh);
 
 
/*--------------------------------------------------------------------*
 *                General rasterop (basic pix interface)              *
 *--------------------------------------------------------------------*/
l_ok
pixRasterop(PIX     *pixd,
            l_int32  dx,
            l_int32  dy,
            l_int32  dw,
            l_int32  dh,
            l_int32  op,
            PIX     *pixs,
            l_int32  sx,
            l_int32  sy)
{
l_int32  dpw, dph, dpd, spw, sph, spd;
 
    if (!pixd)
        return ERROR_INT("pixd not defined", __func__, 1);
 
    if (op == PIX_DST)   /* no-op */
        return 0;
 
    pixGetDimensions(pixd, &dpw, &dph, &dpd);
#if 0
    if (checkRasteropCrop(dpw, dph, dx, dy, dw, dh)) {
        L_WARNING("dest crop box out of bounds\n", __func__);
        return 1;
    }
#endif
 
        /* Check if operation is only on dest */
    if (op == PIX_CLR || op == PIX_SET || op == PIX_NOT(PIX_DST)) {
        rasteropUniLow(pixGetData(pixd), dpw, dph, dpd, pixGetWpl(pixd),
                       dx, dy, dw, dh, op);
        return 0;
    }
 
        /* Two-image rasterop; the depths must match */
    if (!pixs)
        return ERROR_INT("pixs not defined", __func__, 1);
    pixGetDimensions(pixs, &spw, &sph, &spd);
    if (dpd != spd)
        return ERROR_INT("depths of pixs and pixd differ", __func__, 1);
#if 0
    if (checkRasteropCrop(spw, sph, sx, sy, dw, dh)) {
        L_WARNING("source crop box out of bounds\n", __func__);
        return 1;
    }
#endif
 
    rasteropLow(pixGetData(pixd), dpw, dph, dpd, pixGetWpl(pixd),
                dx, dy, dw, dh, op,
                pixGetData(pixs), spw, sph, pixGetWpl(pixs), sx, sy);
    return 0;
}
 
 
/*--------------------------------------------------------------------*
 *                    In-place full band translation                  *
 *--------------------------------------------------------------------*/
l_ok
pixRasteropVip(PIX     *pixd,
               l_int32  bx,
               l_int32  bw,
               l_int32  vshift,
               l_int32  incolor)
{
l_int32   w, h, d, index, op;
PIX      *pixt;
PIXCMAP  *cmap;
 
    if (!pixd)
        return ERROR_INT("pixd not defined", __func__, 1);
    if (incolor != L_BRING_IN_WHITE && incolor != L_BRING_IN_BLACK)
        return ERROR_INT("invalid value for incolor", __func__, 1);
    if (bw <= 0)
        return ERROR_INT("bw must be > 0", __func__, 1);
 
    if (vshift == 0)
        return 0;
 
    pixGetDimensions(pixd, &w, &h, &d);
    rasteropVipLow(pixGetData(pixd), w, h, d, pixGetWpl(pixd), bx, bw, vshift);
 
    cmap = pixGetColormap(pixd);
    if (!cmap) {
        if ((d == 1 && incolor == L_BRING_IN_BLACK) ||
            (d > 1 && incolor == L_BRING_IN_WHITE))
            op = PIX_SET;
        else
            op = PIX_CLR;
 
            /* Set the pixels brought in at top or bottom */
        if (vshift > 0)
            pixRasterop(pixd, bx, 0, bw, vshift, op, NULL, 0, 0);
        else  /* vshift < 0 */
            pixRasterop(pixd, bx, h + vshift, bw, -vshift, op, NULL, 0, 0);
        return 0;
    }
 
        /* Get the nearest index and fill with that */
    if (incolor == L_BRING_IN_BLACK)
        pixcmapGetRankIntensity(cmap, 0.0, &index);
    else  /* white */
        pixcmapGetRankIntensity(cmap, 1.0, &index);
    pixt = pixCreate(bw, L_ABS(vshift), d);
    pixSetAllArbitrary(pixt, index);
    if (vshift > 0)
        pixRasterop(pixd, bx, 0, bw, vshift, PIX_SRC, pixt, 0, 0);
    else  /* vshift < 0 */
        pixRasterop(pixd, bx, h + vshift, bw, -vshift, PIX_SRC, pixt, 0, 0);
    pixDestroy(&pixt);
    return 0;
}
 
 
l_ok
pixRasteropHip(PIX     *pixd,
               l_int32  by,
               l_int32  bh,
               l_int32  hshift,
               l_int32  incolor)
{
l_int32   w, h, d, index, op;
PIX      *pixt;
PIXCMAP  *cmap;
 
    if (!pixd)
        return ERROR_INT("pixd not defined", __func__, 1);
    if (incolor != L_BRING_IN_WHITE && incolor != L_BRING_IN_BLACK)
        return ERROR_INT("invalid value for incolor", __func__, 1);
    if (bh <= 0)
        return ERROR_INT("bh must be > 0", __func__, 1);
 
    if (hshift == 0)
        return 0;
 
    pixGetDimensions(pixd, &w, &h, &d);
    rasteropHipLow(pixGetData(pixd), h, d, pixGetWpl(pixd), by, bh, hshift);
 
    cmap = pixGetColormap(pixd);
    if (!cmap) {
        if ((d == 1 && incolor == L_BRING_IN_BLACK) ||
            (d > 1 && incolor == L_BRING_IN_WHITE))
            op = PIX_SET;
        else
            op = PIX_CLR;
 
            /* Set the pixels brought in at left or right */
        if (hshift > 0)
            pixRasterop(pixd, 0, by, hshift, bh, op, NULL, 0, 0);
        else  /* hshift < 0 */
            pixRasterop(pixd, w + hshift, by, -hshift, bh, op, NULL, 0, 0);
        return 0;
    }
 
        /* Get the nearest index and fill with that */
    if (incolor == L_BRING_IN_BLACK)
        pixcmapGetRankIntensity(cmap, 0.0, &index);
    else  /* white */
        pixcmapGetRankIntensity(cmap, 1.0, &index);
    pixt = pixCreate(L_ABS(hshift), bh, d);
    pixSetAllArbitrary(pixt, index);
    if (hshift > 0)
        pixRasterop(pixd, 0, by, hshift, bh, PIX_SRC, pixt, 0, 0);
    else  /* hshift < 0 */
        pixRasterop(pixd, w + hshift, by, -hshift, bh, PIX_SRC, pixt, 0, 0);
    pixDestroy(&pixt);
    return 0;
}
 
 
/*--------------------------------------------------------------------*
 *             Full image translation (general and in-place)          *
 *--------------------------------------------------------------------*/
PIX *
pixTranslate(PIX     *pixd,
             PIX     *pixs,
             l_int32  hshift,
             l_int32  vshift,
             l_int32  incolor)
{
    if (!pixs)
        return (PIX *)ERROR_PTR("pixs not defined", __func__, NULL);
 
        /* Prepare pixd for in-place operation */
    if ((pixd = pixCopy(pixd, pixs)) == NULL)
        return (PIX *)ERROR_PTR("pixd not made", __func__, NULL);
 
    pixRasteropIP(pixd, hshift, vshift, incolor);
    return pixd;
}
 
 
l_ok
pixRasteropIP(PIX     *pixd,
              l_int32  hshift,
              l_int32  vshift,
              l_int32  incolor)
{
l_int32  w, h;
 
    if (!pixd)
        return ERROR_INT("pixd not defined", __func__, 1);
 
    pixGetDimensions(pixd, &w, &h, NULL);
    pixRasteropHip(pixd, 0, h, hshift, incolor);
    pixRasteropVip(pixd, 0, w, vshift, incolor);
 
    return 0;
}
 
 
/*--------------------------------------------------------------------*
 *                 Full image rasterop with no shifts                 *
 *--------------------------------------------------------------------*/
l_ok
pixRasteropFullImage(PIX     *pixd,
                     PIX     *pixs,
                     l_int32  op)
{
    if (!pixd)
        return ERROR_INT("pixd not defined", __func__, 1);
    if (!pixs)
        return ERROR_INT("pixs not defined", __func__, 1);
 
    pixRasterop(pixd, 0, 0, pixGetWidth(pixd), pixGetHeight(pixd), op,
                pixs, 0, 0);
    return 0;
}
 
 
/*--------------------------------------------------------------------*
 *                    Checking for invalid crop box                   *
 *--------------------------------------------------------------------*/
static l_int32
checkRasteropCrop(l_int32 pixw,
                  l_int32 pixh,
                  l_int32 x,
                  l_int32 y,
                  l_int32 w,
                  l_int32 h)
{
    if (pixw < 1 || pixh < 1 || w < 1 || h < 1)
        return ERROR_INT("dimension is <= 0", __func__, 1);
 
    if (x + w <= 0 || y + h <= 0)
        return ERROR_INT("box to left or above pix", __func__, 1);
 
    if (x >= pixw || y >= pixh)
        return ERROR_INT("box to right or below pix", __func__, 1);
 
    return 0;
}