DLLSYM void block_edges( //get edges in a block
IMAGE *t_image, //threshold image
PDBLK *block, //block in image
ICOORD page_tr //corner of page
) {
uinT8 margin; //margin colour
inT16 x; //line coords
inT16 y; //current line
ICOORD bleft; //bounding box
ICOORD tright;
ICOORD block_bleft; //bounding box
ICOORD block_tright;
int xindex; //index to pixel
BLOCK_LINE_IT line_it = block; //line iterator
IMAGELINE bwline; //thresholded line
//lines in progress
CRACKEDGE **ptrline = new CRACKEDGE*[t_image->get_xsize()+1];
block->bounding_box (bleft, tright); // block box
block_bleft = bleft;
block_tright = tright;
for (x = tright.x () - bleft.x (); x >= 0; x--)
ptrline[x] = NULL; //no lines in progress
bwline.init (t_image->get_xsize());
margin = WHITE_PIX;
for (y = tright.y () - 1; y >= bleft.y () - 1; y--) {
if (y >= block_bleft.y () && y < block_tright.y ()) {
t_image->get_line (bleft.x (), y, tright.x () - bleft.x (), &bwline,
0);
make_margins (block, &line_it, bwline.pixels, margin, bleft.x (),
tright.x (), y);
}
else {
x = tright.x () - bleft.x ();
for (xindex = 0; xindex < x; xindex++)
bwline.pixels[xindex] = margin;
}
line_edges (bleft.x (), y, tright.x () - bleft.x (),
margin, bwline.pixels, ptrline);
}
free_crackedges(free_cracks); //really free them
free_cracks = NULL;
delete [] ptrline;
}
void block_edges(Pix *t_pix, // thresholded image
PDBLK *block, // block in image
C_OUTLINE_IT* outline_it) {
ICOORD bleft; // bounding box
ICOORD tright;
BLOCK_LINE_IT line_it = block; // line iterator
int width = pixGetWidth(t_pix);
int height = pixGetHeight(t_pix);
int wpl = pixGetWpl(t_pix);
// lines in progress
CRACKEDGE **ptrline = new CRACKEDGE*[width + 1];
CRACKEDGE *free_cracks = NULL;
block->bounding_box(bleft, tright); // block box
int block_width = tright.x() - bleft.x();
for (int x = block_width; x >= 0; x--)
ptrline[x] = NULL; // no lines in progress
uinT8* bwline = new uinT8[width];
uinT8 margin = WHITE_PIX;
for (int y = tright.y() - 1; y >= bleft.y() - 1; y--) {
if (y >= bleft.y() && y < tright.y()) {
// Get the binary pixels from the image.
l_uint32* line = pixGetData(t_pix) + wpl * (height - 1 - y);
for (int x = 0; x < block_width; ++x) {
bwline[x] = GET_DATA_BIT(line, x + bleft.x()) ^ 1;
}
make_margins(block, &line_it, bwline, margin, bleft.x(), tright.x(), y);
} else {
memset(bwline, margin, block_width * sizeof(bwline[0]));
}
line_edges(bleft.x(), y, block_width,
margin, bwline, ptrline, &free_cracks, outline_it);
}
free_crackedges(free_cracks); // really free them
delete[] ptrline;
delete[] bwline;
}
