Function pixConvertTo2

deps/leptonica/src/pixconv.c:2717–2755

---------------------------------------------------------------------------* * Top-level conversion to 2 bpp * *---------------------------------------------------------------------------*/ ! * \brief pixConvertTo2() * * \param[in] pixs 1, 2, 4, 8, 32 bpp; colormap OK but will be removed * \return pixd 2 bpp, or NULL on error * *

 * </pre>
 */
PIX *
pixConvertTo2(PIX  *pixs)
{
l_int32  d;
PIX     *pix1, *pix2, *pix3, *pixd;

    PROCNAME("pixConvertTo2");

    if (!pixs)
        return (PIX *)ERROR_PTR("pixs not defined", procName, NULL);
    d = pixGetDepth(pixs);
    if (d != 1 && d != 2 && d != 4 && d != 8 && d != 32)
        return (PIX *)ERROR_PTR("depth not {1,2,4,8,32}", procName, NULL);

    if (pixGetColormap(pixs) != NULL) {
        pix1 = pixRemoveColormap(pixs, REMOVE_CMAP_TO_GRAYSCALE);
        d = pixGetDepth(pix1);
    } else {
        pix1 = pixCopy(NULL, pixs);
    }
    if (d == 32)
        pix2 = pixConvertTo8(pix1, FALSE);
    else
        pix2 = pixClone(pix1);
    pixDestroy(&pix1);
    if (d == 1) {
        pixd = pixConvert1To2(NULL, pix2, 3, 0);
    } else if (d == 2) {
        pixd = pixClone(pix2);
    } else if (d == 4) {
        pix3 = pixConvert4To8(pix2, FALSE);  /* unpack to 8 */
        pixd = pixConvert8To2(pix3);
        pixDestroy(&pix3);
    } else {  /* d == 8 */
        pixd = pixConvert8To2(pix2);
    }
    pixDestroy(&pix2);
    return pixd;
}


/*!