Пример #1
0
/*!
 *  pixEmbedForRotation()
 *
 *      Input:  pixs (1, 2, 4, 8, 32 bpp rgb)
 *              angle (radians; clockwise is positive)
 *              incolor (L_BRING_IN_WHITE, L_BRING_IN_BLACK)
 *              width (original width; use 0 to avoid embedding)
 *              height (original height; use 0 to avoid embedding)
 *      Return: pixd, or null on error
 *
 *  Notes:
 *      (1) For very small rotations, just return a clone.
 *      (2) Generate larger image to embed pixs if necessary, and
 *          place the center of the input image in the center.
 *      (3) Rotation brings either white or black pixels in
 *          from outside the image.  For colormapped images where
 *          there is no white or black, a new color is added if
 *          possible for these pixels; otherwise, either the
 *          lightest or darkest color is used.  In most cases,
 *          the colormap will be removed prior to rotation.
 *      (4) The dest is to be expanded so that no image pixels
 *          are lost after rotation.  Input of the original width
 *          and height allows the expansion to stop at the maximum
 *          required size, which is a square with side equal to
 *          sqrt(w*w + h*h).
 *      (5) For an arbitrary angle, the expansion can be found by
 *          considering the UL and UR corners.  As the image is
 *          rotated, these move in an arc centered at the center of
 *          the image.  Normalize to a unit circle by dividing by half
 *          the image diagonal.  After a rotation of T radians, the UL
 *          and UR corners are at points T radians along the unit
 *          circle.  Compute the x and y coordinates of both these
 *          points and take the max of absolute values; these represent
 *          the half width and half height of the containing rectangle.
 *          The arithmetic is done using formulas for sin(a+b) and cos(a+b),
 *          where b = T.  For the UR corner, sin(a) = h/d and cos(a) = w/d.
 *          For the UL corner, replace a by (pi - a), and you have
 *          sin(pi - a) = h/d, cos(pi - a) = -w/d.  The equations
 *          given below follow directly.
 */
PIX *
pixEmbedForRotation(PIX       *pixs,
                    l_float32  angle,
                    l_int32    incolor,
                    l_int32    width,
                    l_int32    height)
{
l_int32    w, h, d, w1, h1, w2, h2, maxside, wnew, hnew, xoff, yoff, setcolor;
l_float64  sina, cosa, fw, fh;
PIX       *pixd;

    PROCNAME("pixEmbedForRotation");

    if (!pixs)
        return (PIX *)ERROR_PTR("pixs not defined", procName, NULL);
    if (incolor != L_BRING_IN_WHITE && incolor != L_BRING_IN_BLACK)
        return (PIX *)ERROR_PTR("invalid incolor", procName, NULL);
    if (L_ABS(angle) < MIN_ANGLE_TO_ROTATE)
        return pixClone(pixs);

        /* Test if big enough to hold any rotation of the original image */
    pixGetDimensions(pixs, &w, &h, &d);
    maxside = (l_int32)(sqrt((l_float64)(width * width) +
                             (l_float64)(height * height)) + 0.5);
    if (w >= maxside && h >= maxside)  /* big enough */
        return pixClone(pixs);

        /* Find the new sizes required to hold the image after rotation.
         * Note that the new dimensions must be at least as large as those
         * of pixs, because we're rasterop-ing into it before rotation. */
    cosa = cos(angle);
    sina = sin(angle);
    fw = (l_float64)w;
    fh = (l_float64)h;
    w1 = (l_int32)(L_ABS(fw * cosa - fh * sina) + 0.5);
    w2 = (l_int32)(L_ABS(-fw * cosa - fh * sina) + 0.5);
    h1 = (l_int32)(L_ABS(fw * sina + fh * cosa) + 0.5);
    h2 = (l_int32)(L_ABS(-fw * sina + fh * cosa) + 0.5);
    wnew = L_MAX(w, L_MAX(w1, w2));
    hnew = L_MAX(h, L_MAX(h1, h2));

    if ((pixd = pixCreate(wnew, hnew, d)) == NULL)
        return (PIX *)ERROR_PTR("pixd not made", procName, NULL);
    pixCopyResolution(pixd, pixs);
    pixCopyColormap(pixd, pixs);
    pixCopySpp(pixd, pixs);
    pixCopyText(pixd, pixs);
    xoff = (wnew - w) / 2;
    yoff = (hnew - h) / 2;

        /* Set background to color to be rotated in */
    setcolor = (incolor == L_BRING_IN_BLACK) ? L_SET_BLACK : L_SET_WHITE;
    pixSetBlackOrWhite(pixd, setcolor);

        /* Rasterop automatically handles all 4 channels for rgba */
    pixRasterop(pixd, xoff, yoff, w, h, PIX_SRC, pixs, 0, 0);
    return pixd;
}
Пример #2
0
/*!
 *  pixSelectByWidthHeightRatio()
 *
 *      Input:  pixs (1 bpp)
 *              thresh (threshold ratio of width/height)
 *              connectivity (4 or 8)
 *              type (L_SELECT_IF_LT, L_SELECT_IF_GT,
 *                    L_SELECT_IF_LTE, L_SELECT_IF_GTE)
 *              &changed (<optional return> 1 if changed; 0 if clone returned)
 *      Return: pixd, or null on error
 *
 *  Notes:
 *      (1) The args specify constraints on the width-to-height ratio
 *          for components that are kept.
 *      (2) If unchanged, returns a copy of pixs.  Otherwise,
 *          returns a new pix with the filtered components.
 *      (3) This filters components based on the width-to-height ratios.
 *      (4) Use L_SELECT_IF_LT or L_SELECT_IF_LTE to save components
 *          with less than the threshold ratio, and
 *          L_SELECT_IF_GT or L_SELECT_IF_GTE to remove them.
 */
PIX *
pixSelectByWidthHeightRatio(PIX       *pixs,
                            l_float32  thresh,
                            l_int32    connectivity,
                            l_int32    type,
                            l_int32   *pchanged)
{
l_int32  w, h, empty, changed, count;
BOXA    *boxa;
PIX     *pixd;
PIXA    *pixas, *pixad;

    PROCNAME("pixSelectByWidthHeightRatio");

    if (!pixs)
        return (PIX *)ERROR_PTR("pixs not defined", procName, NULL);
    if (connectivity != 4 && connectivity != 8)
        return (PIX *)ERROR_PTR("connectivity not 4 or 8", procName, NULL);
    if (type != L_SELECT_IF_LT && type != L_SELECT_IF_GT &&
        type != L_SELECT_IF_LTE && type != L_SELECT_IF_GTE)
        return (PIX *)ERROR_PTR("invalid type", procName, NULL);
    if (pchanged) *pchanged = FALSE;
    
        /* Check if any components exist */
    pixZero(pixs, &empty);
    if (empty)
        return pixCopy(NULL, pixs);

        /* Filter components */
    boxa = pixConnComp(pixs, &pixas, connectivity); 
    pixad = pixaSelectByWidthHeightRatio(pixas, thresh, type, &changed);
    boxaDestroy(&boxa);
    pixaDestroy(&pixas);

        /* Render the result */
    if (!changed) {
        pixaDestroy(&pixad);
        return pixCopy(NULL, pixs);
    }
    else {
        if (pchanged) *pchanged = TRUE;
        pixGetDimensions(pixs, &w, &h, NULL);
        count = pixaGetCount(pixad);
        if (count == 0)  /* return empty pix */
            pixd = pixCreateTemplate(pixs);
        else {
            pixd = pixaDisplay(pixad, w, h);
            pixCopyResolution(pixd, pixs);
            pixCopyColormap(pixd, pixs);
            pixCopyText(pixd, pixs);
            pixCopyInputFormat(pixd, pixs);
        }
        pixaDestroy(&pixad);
        return pixd;
    }
}
Пример #3
0
/*!
 *  pixaDisplayUnsplit()
 *
 *      Input:  pixa
 *              nx   (number of mosaic cells horizontally)
 *              ny   (number of mosaic cells vertically)
 *              borderwidth  (of added border on all sides)
 *              bordercolor  (in our RGBA format: 0xrrggbbaa)
 *      Return: pix of tiled images, or null on error
 *
 *  Notes:
 *      (1) This is a logical inverse of pixaSplitPix().  It
 *          constructs a pix from a mosaic of tiles, all of equal size.
 *      (2) For added generality, a border of arbitrary color can
 *          be added to each of the tiles.
 *      (3) In use, pixa will typically have either been generated
 *          from pixaSplitPix() or will derived from a pixa that
 *          was so generated.
 *      (4) All pix in the pixa must be of equal depth, and, if
 *          colormapped, have the same colormap.
 */
PIX *
pixaDisplayUnsplit(PIXA     *pixa,
                   l_int32   nx,
                   l_int32   ny,
                   l_int32   borderwidth,
                   l_uint32  bordercolor)
{
l_int32  w, h, d, wt, ht;
l_int32  i, j, k, x, y, n;
PIX     *pixt, *pixd;

    PROCNAME("pixaDisplayUnsplit");

    if (!pixa)
        return (PIX *)ERROR_PTR("pixa not defined", procName, NULL);
    if (nx <= 0 || ny <= 0)
        return (PIX *)ERROR_PTR("nx and ny must be > 0", procName, NULL);
    if ((n = pixaGetCount(pixa)) == 0)
        return (PIX *)ERROR_PTR("no components", procName, NULL);
    if (n != nx * ny)
        return (PIX *)ERROR_PTR("n != nx * ny", procName, NULL);
    borderwidth = L_MAX(0, borderwidth);

    pixaGetPixDimensions(pixa, 0, &wt, &ht, &d);
    w = nx * (wt + 2 * borderwidth);
    h = ny * (ht + 2 * borderwidth);

    if ((pixd = pixCreate(w, h, d)) == NULL)
        return (PIX *)ERROR_PTR("pixd not made", procName, NULL);
    pixt = pixaGetPix(pixa, 0, L_CLONE);
    pixCopyColormap(pixd, pixt);
    pixDestroy(&pixt);
    if (borderwidth > 0)
        pixSetAllArbitrary(pixd, bordercolor);

    y = borderwidth;
    for (i = 0, k = 0; i < ny; i++) {
        x = borderwidth;
        for (j = 0; j < nx; j++, k++) {
            pixt = pixaGetPix(pixa, k, L_CLONE);
            pixRasterop(pixd, x, y, wt, ht, PIX_SRC, pixt, 0, 0);
            pixDestroy(&pixt);
            x += wt + 2 * borderwidth;
        }
        y += ht + 2 * borderwidth;
    }

    return pixd;
}
Пример #4
0
/*!
 *  pixTransferAllData()
 *
 *      Input:  pixd (must be different from pixs)
 *              &pixs (will be nulled if refcount goes to 0)
 *              copytext (1 to copy the text field; 0 to skip)
 *              copyformat (1 to copy the informat field; 0 to skip)
 *      Return: 0 if OK, 1 on error
 *
 *  Notes:
 *      (1) This does a complete data transfer from pixs to pixd,
 *          followed by the destruction of pixs (refcount permitting).
 *      (2) If the refcount of pixs is 1, pixs is destroyed.  Otherwise,
 *          the data in pixs is copied (rather than transferred) to pixd.
 *      (3) This operation, like all others with a pre-existing pixd,
 *          will side-effect any existing clones of pixd.  The pixd
 *          refcount does not change.
 *      (4) When might you use this?  Suppose you have an in-place Pix
 *          function (returning void) with the typical signature:
 *              void function-inplace(PIX *pix, ...)
 *          where "..." are non-pointer input parameters, and suppose
 *          further that you sometimes want to return an arbitrary Pix
 *          in place of the input Pix.  There are two ways you can do this:
 *          (a) The straightforward way is to change the function
 *              signature to take the address of the Pix ptr:
 *                  void function-inplace(PIX **ppix, ...) {
 *                      PIX *pixt = function-makenew(*ppix);
 *                      pixDestroy(ppix);
 *                      *ppix = pixt;
 *                      return;
 *                  }
 *              Here, the input and returned pix are different, as viewed
 *              by the calling function, and the inplace function is
 *              expected to destroy the input pix to avoid a memory leak.
 *          (b) Keep the signature the same and use pixTransferAllData()
 *              to return the new Pix in the input Pix struct:
 *                  void function-inplace(PIX *pix, ...) {
 *                      PIX *pixt = function-makenew(pix);
 *                      pixTransferAllData(pix, &pixt);  // pixt is destroyed
 *                      return;
 *                  }
 *              Here, the input and returned pix are the same, as viewed
 *              by the calling function, and the inplace function must
 *              never destroy the input pix, because the calling function
 *              maintains an unchanged handle to it.
 */
l_int32
pixTransferAllData(PIX     *pixd,
                   PIX    **ppixs,
                   l_int32  copytext,
                   l_int32  copyformat)
{
l_int32  nbytes;
PIX     *pixs;

    PROCNAME("pixTransferAllData");

    if (!ppixs)
        return ERROR_INT("&pixs not defined", procName, 1);
    if ((pixs = *ppixs) == NULL)
        return ERROR_INT("pixs not defined", procName, 1);
    if (!pixd)
        return ERROR_INT("pixd not defined", procName, 1);
    if (pixs == pixd)  /* no-op */
        return ERROR_INT("pixd == pixs", procName, 1);

    if (pixGetRefcount(pixs) == 1) {  /* transfer the data, cmap, text */
        pixFreeData(pixd);  /* dealloc any existing data */
        pixSetData(pixd, pixGetData(pixs));  /* transfer new data from pixs */
        pixs->data = NULL;  /* pixs no longer owns data */
        pixSetColormap(pixd, pixGetColormap(pixs));  /* frees old; sets new */
        pixs->colormap = NULL;  /* pixs no longer owns colormap */
        if (copytext) {
            pixSetText(pixd, pixGetText(pixs));
            pixSetText(pixs, NULL);
        }
    } else {  /* preserve pixs by making a copy of the data, cmap, text */
        pixResizeImageData(pixd, pixs);
        nbytes = 4 * pixGetWpl(pixs) * pixGetHeight(pixs);
        memcpy((char *)pixGetData(pixd), (char *)pixGetData(pixs), nbytes);
        pixCopyColormap(pixd, pixs);
        if (copytext)
            pixCopyText(pixd, pixs);
    }
  
    pixCopyResolution(pixd, pixs);
    pixCopyDimensions(pixd, pixs);
    if (copyformat)
        pixCopyInputFormat(pixd, pixs);

        /* This will destroy pixs if data was transferred;
         * otherwise, it just decrements its refcount. */
    pixDestroy(ppixs);
    return 0;
}
Пример #5
0
/*!
 *  pixaSplitPix()
 *
 *      Input:  pixs  (with individual components on a lattice)
 *              nx   (number of mosaic cells horizontally)
 *              ny   (number of mosaic cells vertically)
 *              borderwidth  (of added border on all sides)
 *              bordercolor  (in our RGBA format: 0xrrggbbaa)
 *      Return: pixa, or null on error
 *
 *  Notes:
 *      (1) This is a variant on pixaCreateFromPix(), where we
 *          simply divide the image up into (approximately) equal
 *          subunits.  If you want the subimages to have essentially
 *          the same aspect ratio as the input pix, use nx = ny.
 *      (2) If borderwidth is 0, we ignore the input bordercolor and
 *          redefine it to white.
 *      (3) The bordercolor is always used to initialize each tiled pix,
 *          so that if the src is clipped, the unblitted part will
 *          be this color.  This avoids 1 pixel wide black stripes at the
 *          left and lower edges.
 */
PIXA *
pixaSplitPix(PIX      *pixs,
             l_int32   nx,
             l_int32   ny,
             l_int32   borderwidth,
             l_uint32  bordercolor)
{
l_int32  w, h, d, cellw, cellh, i, j;
PIX     *pixt;
PIXA    *pixa;

    PROCNAME("pixaSplitPix");

    if (!pixs)
        return (PIXA *)ERROR_PTR("pixs not defined", procName, NULL);
    if (nx <= 0 || ny <= 0)
        return (PIXA *)ERROR_PTR("nx and ny must be > 0", procName, NULL);
    borderwidth = L_MAX(0, borderwidth);

    if ((pixa = pixaCreate(nx * ny)) == NULL)
        return (PIXA *)ERROR_PTR("pixa not made", procName, NULL);
    pixGetDimensions(pixs, &w, &h, &d);
    cellw = (w + nx - 1) / nx;  /* round up */
    cellh = (h + ny - 1) / ny;

    for (i = 0; i < ny; i++) {
        for (j = 0; j < nx; j++) {
            if ((pixt = pixCreate(cellw + 2 * borderwidth,
                                  cellh + 2 * borderwidth, d)) == NULL)
                return (PIXA *)ERROR_PTR("pixt not made", procName, NULL);
            pixCopyColormap(pixt, pixs);
            if (borderwidth == 0) {  /* initialize full image to white */
                if (d == 1)
                    pixClearAll(pixt);
                else
                    pixSetAll(pixt);
            }
            else
                pixSetAllArbitrary(pixt, bordercolor);
            pixRasterop(pixt, borderwidth, borderwidth, cellw, cellh,
                        PIX_SRC, pixs, j * cellw, i * cellh);
            pixaAddPix(pixa, pixt, L_INSERT);
        }
    }

    return pixa;
}
Пример #6
0
/*!
 *  pixCopy()
 *
 *      Input:  pixd (<optional>; can be null, or equal to pixs,
 *                    or different from pixs)
 *              pixs
 *      Return: pixd, or null on error
 *
 *  Notes:
 *      (1) There are three cases:
 *            (a) pixd == null  (makes a new pix; refcount = 1)
 *            (b) pixd == pixs  (no-op)
 *            (c) pixd != pixs  (data copy; no change in refcount)
 *          If the refcount of pixd > 1, case (c) will side-effect
 *          these handles.
 *      (2) The general pattern of use is:
 *             pixd = pixCopy(pixd, pixs);
 *          This will work for all three cases.
 *          For clarity when the case is known, you can use:
 *            (a) pixd = pixCopy(NULL, pixs);
 *            (c) pixCopy(pixd, pixs);
 *      (3) For case (c), we check if pixs and pixd are the same
 *          size (w,h,d).  If so, the data is copied directly.
 *          Otherwise, the data is reallocated to the correct size
 *          and the copy proceeds.  The refcount of pixd is unchanged.
 *      (4) This operation, like all others that may involve a pre-existing
 *          pixd, will side-effect any existing clones of pixd.
 */
PIX *
pixCopy(PIX  *pixd,   /* can be null */
        PIX  *pixs)
{
l_int32    bytes;
l_uint32  *datas, *datad;

    PROCNAME("pixCopy");

    if (!pixs)
        return (PIX *)ERROR_PTR("pixs not defined", procName, NULL);
    if (pixs == pixd)
        return pixd;

        /* Total bytes in image data */
    bytes = 4 * pixGetWpl(pixs) * pixGetHeight(pixs);

        /* If we're making a new pix ... */
    if (!pixd) {
        if ((pixd = pixCreateTemplate(pixs)) == NULL)
            return (PIX *)ERROR_PTR("pixd not made", procName, NULL);
        datas = pixGetData(pixs);
        datad = pixGetData(pixd);
        memcpy((char *)datad, (char *)datas, bytes);
        return pixd;
    }

        /* Reallocate image data if sizes are different */
    if (pixResizeImageData(pixd, pixs) == 1)
        return (PIX *)ERROR_PTR("reallocation of data failed", procName, NULL);

        /* Copy non-image data fields */
    pixCopyColormap(pixd, pixs);
    pixCopyResolution(pixd, pixs);
    pixCopyInputFormat(pixd, pixs);
    pixCopyText(pixd, pixs);

        /* Copy image data */
    datas = pixGetData(pixs);
    datad = pixGetData(pixd);
    memcpy((char*)datad, (char*)datas, bytes);
    return pixd;
}
Пример #7
0
/*!
 *  pixCreateTemplateNoInit()
 *
 *      Input:  pixs
 *      Return: pixd, or null on error
 *
 *  Notes:
 *      (1) Makes a Pix of the same size as the input Pix, with
 *          the data array allocated but not initialized to 0.
 *      (2) Copies the other fields, including colormap if it exists.
 */
PIX *
pixCreateTemplateNoInit(PIX  *pixs)
{
l_int32  w, h, d;
PIX     *pixd;

    PROCNAME("pixCreateTemplateNoInit");

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

    pixGetDimensions(pixs, &w, &h, &d);
    if ((pixd = pixCreateNoInit(w, h, d)) == NULL)
        return (PIX *)ERROR_PTR("pixd not made", procName, NULL);
    pixCopyResolution(pixd, pixs);
    pixCopyColormap(pixd, pixs);
    pixCopyText(pixd, pixs);
    pixCopyInputFormat(pixd, pixs);

    return pixd;
}
Пример #8
0
/*!
 *  pixRotate90()
 *
 *      Input:  pixs (all depths)
 *              direction (1 = clockwise,  -1 = counter-clockwise)
 *      Return: pixd, or null on error
 *
 *  Notes:
 *      (1) This does a 90 degree rotation of the image about the center,
 *          either cw or ccw, returning a new pix.
 *      (2) The direction must be either 1 (cw) or -1 (ccw).
 */
PIX *
pixRotate90(PIX     *pixs,
            l_int32  direction)
{
l_int32    wd, hd, d, wpls, wpld;
l_uint32  *datas, *datad;
PIX       *pixd;

    PROCNAME("pixRotate90");

    if (!pixs)
        return (PIX *)ERROR_PTR("pixs not defined", procName, NULL);
    d = pixGetDepth(pixs);
    if (d != 1 && d != 2 && d != 4 && d != 8 && d != 16 && d != 32)
        return (PIX *)ERROR_PTR("pixs not in {1,2,4,8,16,32} bpp",
                                procName, NULL);
    if (direction != 1 && direction != -1)
        return (PIX *)ERROR_PTR("invalid direction", procName, NULL);

    hd = pixGetWidth(pixs);
    wd = pixGetHeight(pixs);
    if ((pixd = pixCreate(wd, hd, d)) == NULL)
        return (PIX *)ERROR_PTR("pixd not made", procName, NULL);
    pixCopyColormap(pixd, pixs);
    pixCopyResolution(pixd, pixs);
    pixCopyInputFormat(pixd, pixs);

    datas = pixGetData(pixs);
    wpls = pixGetWpl(pixs);
    datad = pixGetData(pixd);
    wpld = pixGetWpl(pixd);

    rotate90Low(datad, wd, hd, d, wpld, datas, wpls, direction);

    return pixd;
}