/*! * 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; }