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/* SPDX-License-Identifier: GPL-2.0-or-later */
/** \file
* \ingroup freestyle
* \brief Class to define a cell grid surrounding the projected image of a scene
*/
#include <algorithm>
#include <stdexcept>
#include "BoxGrid.h"
#include "BKE_global.h"
using namespace std;
namespace Freestyle {
// Helper Classes
// OccluderData
///////////////
// Cell
/////////
void BoxGrid::Cell::setDimensions(real x, real y, real sizeX, real sizeY)
{
const real epsilon = 1.0e-06;
boundary[0] = x - epsilon;
boundary[1] = x + sizeX + epsilon;
boundary[2] = y - epsilon;
boundary[3] = y + sizeY + epsilon;
}
bool BoxGrid::Cell::compareOccludersByShallowestPoint(const BoxGrid::OccluderData *a,
const BoxGrid::OccluderData *b)
{
return a->shallowest < b->shallowest;
}
void BoxGrid::Cell::indexPolygons()
{
// Sort occluders by their shallowest points.
sort(faces.begin(), faces.end(), compareOccludersByShallowestPoint);
}
// Iterator
//////////////////
BoxGrid::Iterator::Iterator(BoxGrid &grid, Vec3r ¢er, real /*epsilon*/)
: _target(grid.transform(center)), _foundOccludee(false)
{
// Find target cell
_cell = grid.findCell(_target);
#if BOX_GRID_LOGGING
if (G.debug & G_DEBUG_FREESTYLE) {
cout << "Searching for occluders of edge centered at " << _target << " in cell ["
<< 1_cell->boundary[0] << ", " << _cell->boundary[1] << ", " << _cell->boundary[2] << ", "
<< _cell->boundary[3] << "] (" << _cell->faces.size() << " occluders)" << endl;
}
#endif
// Set iterator
_current = _cell->faces.begin();
}
// BoxGrid
/////////////////
BoxGrid::BoxGrid(OccluderSource &source,
GridDensityProvider &density,
ViewMap *viewMap,
Vec3r &viewpoint,
bool enableQI)
: _viewpoint(viewpoint), _enableQI(enableQI)
{
// Generate Cell structure
if (G.debug & G_DEBUG_FREESTYLE) {
cout << "Generate Cell structure" << endl;
}
assignCells(source, density, viewMap);
// Fill Cells
if (G.debug & G_DEBUG_FREESTYLE) {
cout << "Distribute occluders" << endl;
}
distributePolygons(source);
// Reorganize Cells
if (G.debug & G_DEBUG_FREESTYLE) {
cout << "Reorganize cells" << endl;
}
reorganizeCells();
if (G.debug & G_DEBUG_FREESTYLE) {
cout << "Ready to use BoxGrid" << endl;
}
}
BoxGrid::~BoxGrid() = default;
void BoxGrid::assignCells(OccluderSource & /*source*/,
GridDensityProvider &density,
ViewMap *viewMap)
{
_cellSize = density.cellSize();
_cellsX = density.cellsX();
_cellsY = density.cellsY();
_cellOrigin[0] = density.cellOrigin(0);
_cellOrigin[1] = density.cellOrigin(1);
if (G.debug & G_DEBUG_FREESTYLE) {
cout << "Using " << _cellsX << "x" << _cellsY << " cells of size " << _cellSize << " square."
<< endl;
cout << "Cell origin: " << _cellOrigin[0] << ", " << _cellOrigin[1] << endl;
}
// Now allocate the cell table and fill it with default (empty) cells
_cells.resize(_cellsX * _cellsY);
for (cellContainer::iterator i = _cells.begin(), end = _cells.end(); i != end; ++i) {
(*i) = NULL;
}
// Identify cells that will be used, and set the dimensions for each
ViewMap::fedges_container &fedges = viewMap->FEdges();
for (ViewMap::fedges_container::iterator f = fedges.begin(), fend = fedges.end(); f != fend;
++f) {
if ((*f)->isInImage()) {
Vec3r point = transform((*f)->center3d());
unsigned int i, j;
getCellCoordinates(point, i, j);
if (_cells[i * _cellsY + j] == nullptr) {
// This is an uninitialized cell
real x, y, width, height;
x = _cellOrigin[0] + _cellSize * i;
width = _cellSize;
y = _cellOrigin[1] + _cellSize * j;
height = _cellSize;
// Initialize cell
Cell *b = _cells[i * _cellsY + j] = new Cell();
b->setDimensions(x, y, width, height);
}
}
}
}
void BoxGrid::distributePolygons(OccluderSource &source)
{
unsigned long nFaces = 0;
unsigned long nKeptFaces = 0;
for (source.begin(); source.isValid(); source.next()) {
OccluderData *occluder = nullptr;
try {
if (insertOccluder(source, occluder)) {
_faces.push_back(occluder);
++nKeptFaces;
}
}
catch (...) {
// If an exception was thrown, _faces.push_back() cannot have succeeded.
// occluder is not owned by anyone, and must be deleted.
// If the exception was thrown before or during new OccluderData(), then
// occluder is NULL, and this delete is harmless.
delete occluder;
throw;
}
++nFaces;
}
if (G.debug & G_DEBUG_FREESTYLE) {
cout << "Distributed " << nFaces << " occluders. Retained " << nKeptFaces << "." << endl;
}
}
void BoxGrid::reorganizeCells()
{
// Sort the occluders by shallowest point
for (vector<Cell *>::iterator i = _cells.begin(), end = _cells.end(); i != end; ++i) {
if (*i != NULL) {
(*i)->indexPolygons();
}
}
}
void BoxGrid::getCellCoordinates(const Vec3r &point, unsigned &x, unsigned &y)
{
x = min(_cellsX - 1, (unsigned)floor(max((double)0.0f, point[0] - _cellOrigin[0]) / _cellSize));
y = min(_cellsY - 1, (unsigned)floor(max((double)0.0f, point[1] - _cellOrigin[1]) / _cellSize));
}
BoxGrid::Cell *BoxGrid::findCell(const Vec3r &point)
{
unsigned int x, y;
getCellCoordinates(point, x, y);
return _cells[x * _cellsY + y];
}
bool BoxGrid::orthographicProjection() const
{
return true;
}
const Vec3r &BoxGrid::viewpoint() const
{
return _viewpoint;
}
bool BoxGrid::enableQI() const
{
return _enableQI;
}
Vec3r BoxGrid::Transform::operator()(const Vec3r &point) const
{
return Vec3r(point[0], point[1], -point[2]);
}
} /* namespace Freestyle */
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