1 files changed, 61 insertions, 0 deletions
diff --git a/coding/pointd_to_pointu.cpp b/coding/pointd_to_pointu.cpp
new file mode 100644
index 0000000000..6cc75da59c
--- /dev/null
+++ b/coding/pointd_to_pointu.cpp
@@ -0,0 +1,61 @@
+#include "coding/pointd_to_pointu.hpp"
+
+#include "geometry/mercator.hpp"
+
+#include "base/bits.hpp"
+#include "base/math.hpp"
+
+namespace
+{
+double CoordSize(uint32_t coordBits) { return (1 << coordBits) - 1; }
+}  // namespace
+
+uint32_t DoubleToUint32(double x, double min, double max, uint32_t coordBits)
+{
+  ASSERT_GREATER_OR_EQUAL(coordBits, 1, ());
+  ASSERT_LESS_OR_EQUAL(coordBits, 32, ());
+  x = my::clamp(x, min, max);
+  return static_cast<uint32_t>(0.5 + (x - min) / (max - min) * bits::GetFullMask(static_cast<uint8_t>(coordBits)));
+}
+
+double Uint32ToDouble(uint32_t x, double min, double max, uint32_t coordBits)
+{
+  ASSERT_GREATER_OR_EQUAL(coordBits, 1, ());
+  ASSERT_LESS_OR_EQUAL(coordBits, 32, ());
+  return min + static_cast<double>(x) * (max - min) / bits::GetFullMask(static_cast<uint8_t>(coordBits));
+}
+
+m2::PointU PointDToPointU(double x, double y, uint32_t coordBits)
+{
+  x = my::clamp(x, MercatorBounds::minX, MercatorBounds::maxX);
+  y = my::clamp(y, MercatorBounds::minY, MercatorBounds::maxY);
+
+  uint32_t const ix = static_cast<uint32_t>(0.5 +
+                                            (x - MercatorBounds::minX) /
+                                                (MercatorBounds::maxX - MercatorBounds::minX) *
+                                                CoordSize(coordBits));
+  uint32_t const iy = static_cast<uint32_t>(0.5 +
+                                            (y - MercatorBounds::minY) /
+                                                (MercatorBounds::maxY - MercatorBounds::minY) *
+                                                CoordSize(coordBits));
+
+  ASSERT_LESS_OR_EQUAL(ix, CoordSize(coordBits), ());
+  ASSERT_LESS_OR_EQUAL(iy, CoordSize(coordBits), ());
+
+  return m2::PointU(ix, iy);
+}
+
+m2::PointU PointDToPointU(m2::PointD const & pt, uint32_t coordBits)
+{
+  return PointDToPointU(pt.x, pt.y, coordBits);
+}
+
+m2::PointD PointUToPointD(m2::PointU const & pt, uint32_t coordBits)
+{
+  return m2::PointD(static_cast<double>(pt.x) * (MercatorBounds::maxX - MercatorBounds::minX) /
+                            CoordSize(coordBits) +
+                        MercatorBounds::minX,
+                    static_cast<double>(pt.y) * (MercatorBounds::maxY - MercatorBounds::minY) /
+                            CoordSize(coordBits) +
+                        MercatorBounds::minY);
+}