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#include <pake/dirtiable-image.hpp>
namespace pake {
struct dirty_region_builder {
std::vector<region> regions_not_on_bottom;
std::list<region> regions_on_bottom;
void add_row(const std::vector<region> &row) {
std::list<region> new_regions_on_bottom;
for (auto i = row.begin(); i < row.end(); ++i) {
bool expanded = false;
for (auto j = regions_on_bottom.begin(); j != regions_on_bottom.end(); ++j)
if (i->start_x == j->start_x && i->width == j->width) {
j->height += i->height;
new_regions_on_bottom.push_back(*j);
regions_on_bottom.erase(j);
expanded = true;
break;
}
if (!expanded)
new_regions_on_bottom.push_back(*i);
}
for (auto i = regions_on_bottom.begin(); i != regions_on_bottom.end(); ++i)
regions_not_on_bottom.push_back(*i);
regions_on_bottom = std::move(new_regions_on_bottom);
}
};
std::vector<region> dirtiable_image::get_dirty_regions() {
dirty_region_builder builder;
std::vector<region> row;
for (int y = 0; y < dirty.height; ++y) {
int r = 0;
for (int x = 0; x < dirty.width; ++x)
if (!dirty.at(x, y)) {
if (r != x)
row.push_back({
.start_x = r, .start_y = y,
.width = x - r, .height = 1
});
r = x + 1;
}
if (r != dirty.width)
row.push_back({
.start_x = r, .start_y = y,
.width = dirty.width - r, .height = 1
});
builder.add_row(row);
row.clear();
}
builder.add_row(row);
return builder.regions_not_on_bottom;
}
void dirtiable_image::clear_dirty() {
dirty.fill(false);
}
dirtiable_image::dirtiable_image(int width, int height)
: image(width, height), dirty(width, height) {
dirty.fill(false);
}
}
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