78 lines
1.6 KiB
C++
78 lines
1.6 KiB
C++
#ifndef MBGL_GEOMETRY_GEOMETRY
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#define MBGL_GEOMETRY_GEOMETRY
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#include <mbgl/util/pbf.hpp>
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#include <mbgl/util/noncopyable.hpp>
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#include <cstdlib>
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namespace mbgl {
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class Geometry : private util::noncopyable {
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public:
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inline explicit Geometry(pbf& data);
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enum command : uint8_t {
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end = 0,
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move_to = 1,
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line_to = 2,
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close = 7
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};
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inline command next(int32_t &rx, int32_t &ry);
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private:
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pbf& data;
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uint8_t cmd;
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uint32_t length;
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int32_t x, y;
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int32_t ox, oy;
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};
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Geometry::Geometry(pbf& data_)
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: data(data_),
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cmd(1),
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length(0),
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x(0), y(0),
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ox(0), oy(0) {}
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Geometry::command Geometry::next(int32_t &rx, int32_t &ry) {
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if (data.data < data.end) {
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if (length == 0) {
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uint32_t cmd_length = static_cast<uint32_t>(data.varint());
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cmd = cmd_length & 0x7;
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length = cmd_length >> 3;
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}
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--length;
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if (cmd == move_to || cmd == line_to) {
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rx = (x += data.svarint());
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ry = (y += data.svarint());
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if (cmd == move_to) {
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ox = x;
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oy = y;
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return move_to;
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} else {
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return line_to;
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}
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} else if (cmd == close) {
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rx = ox;
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ry = oy;
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return close;
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} else {
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fprintf(stderr, "unknown command: %d\n", cmd);
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// TODO: gracefully handle geometry parse failures
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return end;
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}
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} else {
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return end;
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}
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}
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}
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#endif
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