/*!
* ptraReverse()
*
* Input: ptra
* Return: 0 if OK, 1 on error
*/
l_int32
ptraReverse(L_PTRA *pa) {
l_int32 i, imax;
PROCNAME("ptraReverse");
if (!pa)
return ERROR_INT("pa not defined", procName, 1);
ptraGetMaxIndex(pa, &imax);
for (i = 0; i < (imax + 1) / 2; i++)
ptraSwap(pa, i, imax - i);
return 0;
}
int main(int argc,
char **argv)
{
l_int32 i, n, w, h, nactual, imax;
BOX *box;
BOXA *boxa;
PIX *pixs, *pixd, *pix;
PIXA *pixas, *pixat, *pixac;
L_PTRA *papix, *pabox, *papix2, *pabox2;
static char mainName[] = "ptra1_reg";
if (argc != 1)
return ERROR_INT(" Syntax: ptra1_reg", mainName, 1);
setLeptDebugOK(1);
pixac = pixaCreate(0);
if ((pixs = pixRead("lucasta.1.300.tif")) == NULL)
return ERROR_INT("pixs not made", mainName, 1);
pixGetDimensions(pixs, &w, &h, NULL);
boxa = pixConnComp(pixs, &pixas, 8);
pixDestroy(&pixs);
boxaDestroy(&boxa);
n = pixaGetCount(pixas);
/* Fill ptras with clones and reconstruct */
fprintf(stderr, "Fill with clones and reconstruct\n");
MakePtrasFromPixa(pixas, &papix, &pabox, L_CLONE);
pixat = ReconstructPixa(papix, pabox, CHOOSE_RECON);
ptraDestroy(&papix, 0, 1);
ptraDestroy(&pabox, 0, 1);
DisplayResult(pixac, &pixat, w, h, 1);
/* Remove every other one for the first half;
* with compaction at each removal */
fprintf(stderr, "Remove every other in 1st half, with compaction\n");
MakePtrasFromPixa(pixas, &papix, &pabox, L_COPY);
for (i = 0; i < n / 2; i++) {
if (i % 2 == 0) {
pix = (PIX *)ptraRemove(papix, i, L_COMPACTION);
box = (BOX *)ptraRemove(pabox, i, L_COMPACTION);
pixDestroy(&pix);
boxDestroy(&box);
}
}
pixat = ReconstructPixa(papix, pabox, CHOOSE_RECON);
ptraDestroy(&papix, 0, 1);
ptraDestroy(&pabox, 0, 1);
DisplayResult(pixac, &pixat, w, h, 0);
/* Remove every other one for the entire set,
* but without compaction at each removal */
fprintf(stderr,
"Remove every other in 1st half, without & then with compaction\n");
MakePtrasFromPixa(pixas, &papix, &pabox, L_COPY);
for (i = 0; i < n; i++) {
if (i % 2 == 0) {
pix = (PIX *)ptraRemove(papix, i, L_NO_COMPACTION);
box = (BOX *)ptraRemove(pabox, i, L_NO_COMPACTION);
pixDestroy(&pix);
boxDestroy(&box);
}
}
ptraCompactArray(papix); /* now do the compaction */
ptraCompactArray(pabox);
pixat = ReconstructPixa(papix, pabox, CHOOSE_RECON);
ptraDestroy(&papix, 0, 1);
ptraDestroy(&pabox, 0, 1);
DisplayResult(pixac, &pixat, w, h, 0);
/* Fill ptras using insert at head, and reconstruct */
fprintf(stderr, "Insert at head and reconstruct\n");
papix = ptraCreate(n);
pabox = ptraCreate(n);
for (i = 0; i < n; i++) {
pix = pixaGetPix(pixas, i, L_CLONE);
box = pixaGetBox(pixas, i, L_CLONE);
ptraInsert(papix, 0, pix, L_MIN_DOWNSHIFT);
ptraInsert(pabox, 0, box, L_FULL_DOWNSHIFT);
}
pixat = ReconstructPixa(papix, pabox, CHOOSE_RECON);
ptraDestroy(&papix, 0, 1);
ptraDestroy(&pabox, 0, 1);
DisplayResult(pixac, &pixat, w, h, 1);
/* Reverse the arrays by swapping */
fprintf(stderr, "Reverse by swapping\n");
MakePtrasFromPixa(pixas, &papix, &pabox, L_CLONE);
for (i = 0; i < n / 2; i++) {
ptraSwap(papix, i, n - i - 1);
ptraSwap(pabox, i, n - i - 1);
}
ptraCompactArray(papix); /* already compact; shouldn't do anything */
ptraCompactArray(pabox);
pixat = ReconstructPixa(papix, pabox, CHOOSE_RECON);
ptraDestroy(&papix, 0, 1);
ptraDestroy(&pabox, 0, 1);
DisplayResult(pixac, &pixat, w, h, 0);
/* Remove at the top of the array and push the hole to the end
* by neighbor swapping (!). This is O(n^2), so it's not a
* recommended way to copy a ptra. [joke] */
fprintf(stderr,
"Remove at top, pushing hole to end by swapping -- O(n^2)\n");
MakePtrasFromPixa(pixas, &papix, &pabox, L_CLONE);
papix2 = ptraCreate(0);
pabox2 = ptraCreate(0);
while (1) {
ptraGetActualCount(papix, &nactual);
if (nactual == 0) break;
ptraGetMaxIndex(papix, &imax);
pix = (PIX *)ptraRemove(papix, 0, L_NO_COMPACTION);
box = (BOX *)ptraRemove(pabox, 0, L_NO_COMPACTION);
ptraAdd(papix2, pix);
ptraAdd(pabox2, box);
for (i = 1; i <= imax; i++) {
ptraSwap(papix, i - 1, i);
ptraSwap(pabox, i - 1, i);
}
}
ptraCompactArray(papix); /* should be empty */
ptraCompactArray(pabox); /* ditto */
pixat = ReconstructPixa(papix, pabox, CHOOSE_RECON);
ptraDestroy(&papix, 0, 1);
ptraDestroy(&pabox, 0, 1);
DisplayResult(pixac, &pixat, w, h, 1); /* nothing there */
pixat = ReconstructPixa(papix2, pabox2, CHOOSE_RECON);
ptraDestroy(&papix2, 0, 1);
ptraDestroy(&pabox2, 0, 1);
DisplayResult(pixac, &pixat, w, h, 0);
/* Remove and insert one position above, allowing minimum downshift.
* If you specify L_AUTO_DOWNSHIFT, because there is only 1 hole,
* it will do a full downshift at each insert. This is a
* situation where the heuristic (expected number of holes)
* fails to do the optimal thing. */
fprintf(stderr, "Remove and insert one position above (min downshift)\n");
MakePtrasFromPixa(pixas, &papix, &pabox, L_CLONE);
for (i = 1; i < n; i++) {
pix = (PIX *)ptraRemove(papix, i, L_NO_COMPACTION);
box = (BOX *)ptraRemove(pabox, i, L_NO_COMPACTION);
ptraInsert(papix, i - 1, pix, L_MIN_DOWNSHIFT);
ptraInsert(pabox, i - 1, box, L_MIN_DOWNSHIFT);
}
pixat = ReconstructPixa(papix, pabox, CHOOSE_RECON);
ptraDestroy(&papix, 0, 1);
ptraDestroy(&pabox, 0, 1);
DisplayResult(pixac, &pixat, w, h, 1);
/* Remove and insert one position above, but this time
* forcing a full downshift at each step. */
fprintf(stderr, "Remove and insert one position above (full downshift)\n");
MakePtrasFromPixa(pixas, &papix, &pabox, L_CLONE);
for (i = 1; i < n; i++) {
pix = (PIX *)ptraRemove(papix, i, L_NO_COMPACTION);
box = (BOX *)ptraRemove(pabox, i, L_NO_COMPACTION);
ptraInsert(papix, i - 1, pix, L_AUTO_DOWNSHIFT);
ptraInsert(pabox, i - 1, box, L_AUTO_DOWNSHIFT);
}
/* ptraCompactArray(papix);
ptraCompactArray(pabox); */
pixat = ReconstructPixa(papix, pabox, CHOOSE_RECON);
ptraDestroy(&papix, 0, 1);
ptraDestroy(&pabox, 0, 1);
DisplayResult(pixac, &pixat, w, h, 0);
pixd = pixaDisplay(pixac, 0, 0);
pixDisplay(pixd, 100, 100);
pixWrite("/tmp/junkptra1.png", pixd, IFF_PNG);
pixDestroy(&pixd);
pixaDestroy(&pixac);
pixaDestroy(&pixas);
return 0;
}
