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#pragma once
#include <mbgl/math/clamp.hpp>
#include <mbgl/util/image.hpp>
#include <memory>
#include <array>
#include <cassert>
#include <vector>
namespace mbgl {
class DEMPyramid {
public:
class Level {
public:
Level(int32_t width, int32_t height, size_t border);
void set(const int32_t x, const int32_t y, const int32_t value) {
reinterpret_cast<int32_t*>(image.data.get())[idx(x, y)] = value + 65536;
}
int32_t get(const int32_t x, const int32_t y) const {
return reinterpret_cast<const int32_t*>(image.data.get())[idx(x, y)] - 65536;
}
void resample(Level& target);
private:
size_t idx(const int32_t x, const int32_t y) const {
assert(x >= -border);
assert(x < width + border);
assert(y >= -border);
assert(y < height + border);
return (y + border) * stride + (x + border);
}
public:
const int32_t width;
const int32_t height;
const int32_t border;
const int32_t stride;
PremultipliedImage image;
};
void buildLevels();
std::vector<Level> levels;
};
} // namespace mbgl
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