Function pixConvertRGBToHSV

deps/leptonica/src/colorspace.c:133–176

---------------------------------------------------------------------------* * Colorspace conversion between RGB and HSB * *---------------------------------------------------------------------------*/ ! * \brief pixConvertRGBToHSV() * * \param[in] pixd can be NULL; if not NULL, must == pixs * \param[in] pixs * \return pixd always * * * Note

 * </pre>
 */
PIX *
pixConvertRGBToHSV(PIX  *pixd,
                   PIX  *pixs)
{
l_int32    w, h, d, wpl, i, j, rval, gval, bval, hval, sval, vval;
l_uint32  *line, *data;
PIXCMAP   *cmap;

    PROCNAME("pixConvertRGBToHSV");

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

    d = pixGetDepth(pixs);
    cmap = pixGetColormap(pixs);
    if (!cmap && d != 32)
        return (PIX *)ERROR_PTR("not cmapped or rgb", procName, pixd);

    if (!pixd)
        pixd = pixCopy(NULL, pixs);

    cmap = pixGetColormap(pixd);
    if (cmap) {   /* just convert the colormap */
        pixcmapConvertRGBToHSV(cmap);
        return pixd;
    }

        /* Convert RGB image */
    pixGetDimensions(pixd, &w, &h, NULL);
    wpl = pixGetWpl(pixd);
    data = pixGetData(pixd);
    for (i = 0; i < h; i++) {
        line = data + i * wpl;
        for (j = 0; j < w; j++) {
            extractRGBValues(line[j], &rval, &gval, &bval);
            convertRGBToHSV(rval, gval, bval, &hval, &sval, &vval);
            line[j] = (hval << 24) | (sval << 16) | (vval << 8);
        }
    }

    return pixd;
}


/*!