/usr/include/mapbox/geometry/wagyu/process_horizontal.hpp is in libmapbox-wagyu-dev 0.4.3-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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#include <mapbox/geometry/line_string.hpp>
#include <mapbox/geometry/point.hpp>
#include <mapbox/geometry/polygon.hpp>
#include <mapbox/geometry/wagyu/config.hpp>
#include <mapbox/geometry/wagyu/edge.hpp>
#include <mapbox/geometry/wagyu/local_minimum.hpp>
#include <mapbox/geometry/wagyu/util.hpp>
namespace mapbox {
namespace geometry {
namespace wagyu {
template <typename T>
active_bound_list_itr<T> process_horizontal_left_to_right(T scanline_y,
active_bound_list_itr<T>& horz_bound,
active_bound_list<T>& active_bounds,
ring_manager<T>& rings,
scanbeam_list<T>& scanbeam,
clip_type cliptype,
fill_type subject_fill_type,
fill_type clip_fill_type) {
auto horizontal_itr_behind = horz_bound;
bool shifted = false;
bool is_maxima_edge = is_maxima(horz_bound, scanline_y);
auto bound_max_pair = active_bounds.end();
if (is_maxima_edge) {
bound_max_pair = get_maxima_pair<T>(horz_bound, active_bounds);
}
auto hp_itr = rings.current_hp_itr;
while (hp_itr != rings.hot_pixels.end() &&
(hp_itr->y > scanline_y ||
(hp_itr->y == scanline_y && hp_itr->x < (*horz_bound)->current_edge->bot.x))) {
++hp_itr;
}
auto bnd = std::next(horz_bound);
while (bnd != active_bounds.end()) {
if (*bnd == nullptr) {
++bnd;
continue;
}
// this code block inserts extra coords into horizontal edges (in output
// polygons) wherever hot pixels touch these horizontal edges. This helps
//'simplifying' polygons (ie if the Simplify property is set).
while (hp_itr != rings.hot_pixels.end() && hp_itr->y == scanline_y &&
hp_itr->x < wround<T>((*bnd)->current_x) &&
hp_itr->x < (*horz_bound)->current_edge->top.x) {
if ((*horz_bound)->ring) {
add_point_to_ring(*(*horz_bound), *hp_itr, rings);
}
++hp_itr;
}
if ((*bnd)->current_x > static_cast<double>((*horz_bound)->current_edge->top.x)) {
break;
}
// Also break if we've got to the end of an intermediate horizontal edge ...
// nb: Smaller Dx's are to the right of larger Dx's ABOVE the horizontal.
if (wround<T>((*bnd)->current_x) == (*horz_bound)->current_edge->top.x &&
(*horz_bound)->next_edge != (*horz_bound)->edges.end() &&
(*horz_bound)->current_edge->dx < (*horz_bound)->next_edge->dx) {
break;
}
// note: may be done multiple times
if ((*horz_bound)->ring) {
add_point_to_ring(*(*horz_bound),
mapbox::geometry::point<T>(wround<T>((*bnd)->current_x), scanline_y),
rings);
}
// OK, so far we're still in range of the horizontal Edge but make sure
// we're at the last of consec. horizontals when matching with eMaxPair
if (is_maxima_edge && bnd == bound_max_pair) {
if ((*horz_bound)->ring) {
add_local_maximum_point(*(*horz_bound), *(*bound_max_pair),
(*horz_bound)->current_edge->top, rings, active_bounds);
}
*bound_max_pair = nullptr;
*horz_bound = nullptr;
if (!shifted) {
++horizontal_itr_behind;
}
return horizontal_itr_behind;
}
intersect_bounds(*(*horz_bound), *(*bnd),
mapbox::geometry::point<T>(wround<T>((*bnd)->current_x), scanline_y),
cliptype, subject_fill_type, clip_fill_type, rings, active_bounds);
std::iter_swap(horz_bound, bnd);
horz_bound = bnd;
++bnd;
shifted = true;
} // end while (bnd != active_bounds.end())
if ((*horz_bound)->ring) {
while (hp_itr != rings.hot_pixels.end() && hp_itr->y == scanline_y &&
hp_itr->x < (*horz_bound)->current_edge->top.x) {
add_point_to_ring(*(*horz_bound), *hp_itr, rings);
++hp_itr;
}
}
if ((*horz_bound)->ring) {
add_point_to_ring(*(*horz_bound), (*horz_bound)->current_edge->top, rings);
}
if ((*horz_bound)->next_edge != (*horz_bound)->edges.end()) {
next_edge_in_bound(*(*horz_bound), scanbeam);
} else {
*horz_bound = nullptr;
}
if (!shifted) {
++horizontal_itr_behind;
}
return horizontal_itr_behind;
}
template <typename T>
active_bound_list_itr<T> process_horizontal_right_to_left(T scanline_y,
active_bound_list_itr<T>& horz_bound_fwd,
active_bound_list<T>& active_bounds,
ring_manager<T>& rings,
scanbeam_list<T>& scanbeam,
clip_type cliptype,
fill_type subject_fill_type,
fill_type clip_fill_type) {
auto next_bnd_itr = std::next(horz_bound_fwd);
bool is_maxima_edge = is_maxima(horz_bound_fwd, scanline_y);
auto bound_max_pair = active_bounds.rend();
if (is_maxima_edge) {
bound_max_pair =
active_bound_list_rev_itr<T>(get_maxima_pair<T>(horz_bound_fwd, active_bounds));
--bound_max_pair;
}
auto hp_itr_fwd = rings.current_hp_itr;
while (
hp_itr_fwd != rings.hot_pixels.end() &&
(hp_itr_fwd->y < scanline_y ||
(hp_itr_fwd->y == scanline_y && hp_itr_fwd->x < (*horz_bound_fwd)->current_edge->top.x))) {
++hp_itr_fwd;
}
auto hp_itr = hot_pixel_rev_itr<T>(hp_itr_fwd);
auto bnd = active_bound_list_rev_itr<T>(horz_bound_fwd);
auto horz_bound = std::prev(bnd);
while (bnd != active_bounds.rend()) {
if (*bnd == nullptr) {
++bnd;
continue;
}
// this code block inserts extra coords into horizontal edges (in output
// polygons) wherever hot pixels touch these horizontal edges.
while (hp_itr != rings.hot_pixels.rend() && hp_itr->y == scanline_y &&
hp_itr->x > wround<T>((*bnd)->current_x) &&
hp_itr->x > (*horz_bound)->current_edge->top.x) {
if ((*horz_bound)->ring) {
add_point_to_ring(*(*horz_bound), *hp_itr, rings);
}
++hp_itr;
}
if ((*bnd)->current_x < static_cast<double>((*horz_bound)->current_edge->top.x)) {
break;
}
// Also break if we've got to the end of an intermediate horizontal edge ...
// nb: Smaller Dx's are to the right of larger Dx's ABOVE the horizontal.
if (wround<T>((*bnd)->current_x) == (*horz_bound)->current_edge->top.x &&
(*horz_bound)->next_edge != (*horz_bound)->edges.end() &&
(*horz_bound)->current_edge->dx < (*horz_bound)->next_edge->dx) {
break;
}
// note: may be done multiple times
if ((*horz_bound)->ring) {
add_point_to_ring(*(*horz_bound),
mapbox::geometry::point<T>(wround<T>((*bnd)->current_x), scanline_y),
rings);
}
// OK, so far we're still in range of the horizontal Edge but make sure
// we're at the last of consec. horizontals when matching with eMaxPair
if (is_maxima_edge && bnd == bound_max_pair) {
if ((*horz_bound)->ring) {
add_local_maximum_point(*(*horz_bound), *(*bound_max_pair),
(*horz_bound)->current_edge->top, rings, active_bounds);
}
*bound_max_pair = nullptr;
*horz_bound = nullptr;
return next_bnd_itr;
}
intersect_bounds(*(*bnd), *(*horz_bound),
mapbox::geometry::point<T>(wround<T>((*bnd)->current_x), scanline_y),
cliptype, subject_fill_type, clip_fill_type, rings, active_bounds);
std::iter_swap(horz_bound, bnd);
horz_bound = bnd;
++bnd;
} // end while (bnd != active_bounds.rend())
if ((*horz_bound)->ring) {
while (hp_itr != rings.hot_pixels.rend() && hp_itr->y == scanline_y &&
hp_itr->x > (*horz_bound)->current_edge->top.x) {
add_point_to_ring(*(*horz_bound), *hp_itr, rings);
++hp_itr;
}
}
if ((*horz_bound)->ring) {
add_point_to_ring(*(*horz_bound), (*horz_bound)->current_edge->top, rings);
}
if ((*horz_bound)->next_edge != (*horz_bound)->edges.end()) {
next_edge_in_bound(*(*horz_bound), scanbeam);
} else {
*horz_bound = nullptr;
}
return next_bnd_itr;
}
template <typename T>
active_bound_list_itr<T> process_horizontal(T scanline_y,
active_bound_list_itr<T>& horz_bound,
active_bound_list<T>& active_bounds,
ring_manager<T>& rings,
scanbeam_list<T>& scanbeam,
clip_type cliptype,
fill_type subject_fill_type,
fill_type clip_fill_type) {
if ((*horz_bound)->current_edge->bot.x < (*horz_bound)->current_edge->top.x) {
return process_horizontal_left_to_right(scanline_y, horz_bound, active_bounds, rings,
scanbeam, cliptype, subject_fill_type,
clip_fill_type);
} else {
return process_horizontal_right_to_left(scanline_y, horz_bound, active_bounds, rings,
scanbeam, cliptype, subject_fill_type,
clip_fill_type);
}
}
template <typename T>
void process_horizontals(T scanline_y,
active_bound_list<T>& active_bounds,
ring_manager<T>& rings,
scanbeam_list<T>& scanbeam,
clip_type cliptype,
fill_type subject_fill_type,
fill_type clip_fill_type) {
for (auto bnd_itr = active_bounds.begin(); bnd_itr != active_bounds.end();) {
if (*bnd_itr != nullptr && current_edge_is_horizontal<T>(bnd_itr)) {
bnd_itr = process_horizontal(scanline_y, bnd_itr, active_bounds, rings, scanbeam,
cliptype, subject_fill_type, clip_fill_type);
} else {
++bnd_itr;
}
}
active_bounds.erase(std::remove(active_bounds.begin(), active_bounds.end(), nullptr),
active_bounds.end());
}
}
}
}
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