/*!
* pixcmapAddBlackOrWhite()
*
* Input: cmap
* color (0 for black, 1 for white)
* &index (<optional return> index of color; can be null)
* Return: 0 if OK, 1 on error
*
* Notes:
* (1) This only adds color if not already there.
* (2) This sets index to the requested color.
* (3) If there is no room in the colormap, returns the index
* of the closest color.
*/
l_int32
pixcmapAddBlackOrWhite(PIXCMAP *cmap,
l_int32 color,
l_int32 *pindex)
{
l_int32 index;
PROCNAME("pixcmapAddBlackOrWhite");
if (pindex) *pindex = 0;
if (!cmap)
return ERROR_INT("cmap not defined", procName, 1);
if (color == 0) { /* black */
if (pixcmapGetFreeCount(cmap) > 0)
pixcmapAddNewColor(cmap, 0, 0, 0, &index);
else
pixcmapGetRankIntensity(cmap, 0.0, &index);
}
else { /* white */
if (pixcmapGetFreeCount(cmap) > 0)
pixcmapAddNewColor(cmap, 255, 255, 255, &index);
else
pixcmapGetRankIntensity(cmap, 1.0, &index);
}
if (pindex)
*pindex = index;
return 0;
}
/*!
* pixRasteropHip()
*
* Input: pixd (in-place operation)
* by (top of horizontal band)
* bh (height of horizontal band)
* hshift (horizontal shift of band; hshift > 0 is to right)
* incolor (L_BRING_IN_WHITE, L_BRING_IN_BLACK)
* Return: 0 if OK; 1 on error
*
* Notes:
* (1) This rasterop translates a horizontal band of the
* image either left or right, bringing in either white
* or black pixels from outside the image.
* (2) The horizontal band extends the full width of pixd.
* (3) If a colormap exists, the nearest color to white or black
* is brought in.
*/
l_int32
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;
PROCNAME("pixRasteropHip");
if (!pixd)
return ERROR_INT("pixd not defined", procName, 1);
if (incolor != L_BRING_IN_WHITE && incolor != L_BRING_IN_BLACK)
return ERROR_INT("invalid value for incolor", procName, 1);
if (bh <= 0)
return ERROR_INT("bh must be > 0", procName, 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;
}
/*!
* pixcmapSetBlackAndWhite()
*
* Input: cmap
* setblack (0 for no operation; 1 to set darkest color to black)
* setwhite (0 for no operation; 1 to set lightest color to white)
* Return: 0 if OK, 1 on error
*/
l_int32
pixcmapSetBlackAndWhite(PIXCMAP *cmap,
l_int32 setblack,
l_int32 setwhite)
{
l_int32 index;
PROCNAME("pixcmapSetBlackAndWhite");
if (!cmap)
return ERROR_INT("cmap not defined", procName, 1);
if (setblack) {
pixcmapGetRankIntensity(cmap, 0.0, &index);
pixcmapResetColor(cmap, index, 0, 0, 0);
}
if (setwhite) {
pixcmapGetRankIntensity(cmap, 1.0, &index);
pixcmapResetColor(cmap, index, 255, 255, 255);
}
return 0;
}
