void _validate(bool)
{
filter.initialize();
copy_info();
}
// Here we need to expand the image and the bounding box. This is the most important method in a plug like this so
// pay attention
void SyLens::_validate(bool for_real)
{
// Bookkeeping boilerplate
filter.initialize();
input0().validate(for_real);
copy_info();
set_out_channels(Mask_All);
// Do not blank away everything
info_.black_outside(false);
// We need to know our aspects so prep them here
_computeAspects();
distorter.set_aspect(_aspect);
distorter.recompute_if_needed();
if(k_enable_debug_) printf("SyLens: _validate info box to %dx%d\n", plate_width_, plate_height_);
// Time to define how big our output will be in terms of format. Format will always be the whole plate.
// If we only use a bboxed piece of the image we will limit our request to that. But first of all we need to
// compute the format of our output.
int ow, oh;
ow = plate_width_;
oh = plate_height_;
// Nudge outputs to power of 2, upwards
if(ow % 2 != 0) ow +=1;
if(oh % 2 != 0) oh +=1;
// For the case when we are working with a 8k by 4k plate with a SMALL CG pink elephant rrright in the left
// corner we want to actually translate the bbox of the elephant to our distorted pipe downstream. So we need to
// apply our SuperAlgorizm to the bbox as well and move the bbox downstream too.
// Grab the bbox from the input first
Info inf = input0().info();
Format f = input0().format();
// Just distorting the four corners of the bbox is NOT enough. We also need to find out whether
// the bbox intersects the centerlines. Since the distortion is the most extreme at the centerlines if
// we just take the corners we might be chopping some image away. So to get a reliable bbox we need to check
// our padding at 6 points - the 4 extremes and where the bbox crosses the middle of the coordinates
int xMid = ow/2;
int yMid = oh/2;
std::vector<Vector2*> pointsOnBbox;
// Add the standard two points - LR and TR
pointsOnBbox.push_back(new Vector2(inf.x(), inf.y()));
pointsOnBbox.push_back(new Vector2(inf.r(), inf.t()));
// Add the TL and LR as well
pointsOnBbox.push_back(new Vector2(inf.x(), inf.t()));
pointsOnBbox.push_back(new Vector2(inf.r(), inf.y()));
// If our box intersects the midplane on X add the points where the bbox crosses centerline
if((inf.x() < xMid) && (inf.r() > xMid)) {
// Find the two intersections and add them
pointsOnBbox.push_back( new Vector2(xMid, inf.y()) );
pointsOnBbox.push_back( new Vector2(xMid, inf.t()) );
}
// If our box intersects the midplane on Y add the points where the bbox crosses centerline
if((inf.y() < yMid) && (inf.t() > yMid)) {
pointsOnBbox.push_back( new Vector2(inf.x(), yMid) );
pointsOnBbox.push_back( new Vector2(inf.r(), yMid) );
}
std::vector<int> xValues;
std::vector<int> yValues;
// Here the distortion is INVERTED with relation to the pixel operation. With pixels, we need
// to obtain the coordinate to sample FROM. However, here we need a coordinate to sample TO
// since this is where our bbox corners are going to be in the coordinate plane of the output
// format.
for(unsigned int i = 0; i < pointsOnBbox.size(); i++) {
if(kMode == UNDIST) {
undistort_px_into_destination(*pointsOnBbox[i]);
} else {
distort_px_into_source(*pointsOnBbox[i]);
}
xValues.push_back(pointsOnBbox[i]->x);
yValues.push_back(pointsOnBbox[i]->y);
}
int minX, minY, maxX, maxY;
// Formally speaking, we have to allocate an std::iterator first. But we wont.
minX = *std::min_element(xValues.begin(), xValues.end());
maxX = *std::max_element(xValues.begin(), xValues.end());
minY = *std::min_element(yValues.begin(), yValues.end());
maxY = *std::max_element(yValues.begin(), yValues.end());
Box obox(minX, minY, maxX, maxY);
// If trim is enabled we intersect our obox with the format so that there is no bounding box
// outside the crop area. Thiis handy for redistorted material.
if(k_trim_bbox_to_format_) obox.intersect(input0().format());
if(k_enable_debug_) printf("SyLens: output bbox is %dx%d to %dx%d\n", obox.x(), obox.y(), obox.r(), obox.t());
info_.set(obox);
}