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-rw-r--r--src/mbgl/geometry/geometry.hpp77
1 files changed, 77 insertions, 0 deletions
diff --git a/src/mbgl/geometry/geometry.hpp b/src/mbgl/geometry/geometry.hpp
new file mode 100644
index 0000000000..484d17b36d
--- /dev/null
+++ b/src/mbgl/geometry/geometry.hpp
@@ -0,0 +1,77 @@
+#ifndef MBGL_GEOMETRY_GEOMETRY
+#define MBGL_GEOMETRY_GEOMETRY
+
+#include <mbgl/util/pbf.hpp>
+#include <mbgl/util/noncopyable.hpp>
+
+#include <cstdlib>
+
+namespace mbgl {
+
+class Geometry : private util::noncopyable {
+
+public:
+ inline explicit Geometry(pbf& data);
+
+ enum command : uint8_t {
+ end = 0,
+ move_to = 1,
+ line_to = 2,
+ close = 7
+ };
+
+ inline command next(int32_t &rx, int32_t &ry);
+
+private:
+ pbf& data;
+ uint8_t cmd;
+ uint32_t length;
+ int32_t x, y;
+ int32_t ox, oy;
+};
+
+Geometry::Geometry(pbf& data_)
+ : data(data_),
+ cmd(1),
+ length(0),
+ x(0), y(0),
+ ox(0), oy(0) {}
+
+Geometry::command Geometry::next(int32_t &rx, int32_t &ry) {
+ if (data.data < data.end) {
+ if (length == 0) {
+ uint32_t cmd_length = static_cast<uint32_t>(data.varint());
+ cmd = cmd_length & 0x7;
+ length = cmd_length >> 3;
+ }
+
+ --length;
+
+ if (cmd == move_to || cmd == line_to) {
+ rx = (x += data.svarint());
+ ry = (y += data.svarint());
+
+ if (cmd == move_to) {
+ ox = x;
+ oy = y;
+ return move_to;
+ } else {
+ return line_to;
+ }
+ } else if (cmd == close) {
+ rx = ox;
+ ry = oy;
+ return close;
+ } else {
+ fprintf(stderr, "unknown command: %d\n", cmd);
+ // TODO: gracefully handle geometry parse failures
+ return end;
+ }
+ } else {
+ return end;
+ }
+}
+
+}
+
+#endif