Initial version

protobuf/vector_tile.pri

@@ -0,0 +1,17 @@
+INCLUDEPATH += $$PWD
+DEPENDPATH  += $$PWD
+
+protobuf_decl.name = protobuf headers
+protobuf_decl.input = PROTOS
+protobuf_decl.output = ${QMAKE_FILE_IN_PATH}/${QMAKE_FILE_BASE}.pb.h
+protobuf_decl.commands = protoc --cpp_out=${QMAKE_FILE_IN_PATH} --proto_path=${QMAKE_FILE_IN_PATH} ${QMAKE_FILE_NAME}
+protobuf_decl.variable_out = HEADERS
+QMAKE_EXTRA_COMPILERS += protobuf_decl
+
+protobuf_impl.name = protobuf sources
+protobuf_impl.input = PROTOS
+protobuf_impl.output = ${QMAKE_FILE_IN_PATH}/${QMAKE_FILE_BASE}.pb.cc
+protobuf_impl.depends = ${QMAKE_FILE_IN_PATH}/${QMAKE_FILE_BASE}.pb.h
+protobuf_impl.commands = $$escape_expand(\n)
+protobuf_impl.variable_out = SOURCES
+QMAKE_EXTRA_COMPILERS += protobuf_impl

protobuf/vector_tile.proto

@@ -0,0 +1,78 @@
+package vector_tile;
+
+option optimize_for = LITE_RUNTIME;
+
+message Tile {
+
+        // GeomType is described in section 4.3.4 of the specification
+        enum GeomType {
+             UNKNOWN = 0;
+             POINT = 1;
+             LINESTRING = 2;
+             POLYGON = 3;
+        }
+
+        // Variant type encoding
+        // The use of values is described in section 4.1 of the specification
+        message Value {
+                // Exactly one of these values must be present in a valid message
+                optional string string_value = 1;
+                optional float float_value = 2;
+                optional double double_value = 3;
+                optional int64 int_value = 4;
+                optional uint64 uint_value = 5;
+                optional sint64 sint_value = 6;
+                optional bool bool_value = 7;
+
+                extensions 8 to max;
+        }
+
+        // Features are described in section 4.2 of the specification
+        message Feature {
+                optional uint64 id = 1 [ default = 0 ];
+
+                // Tags of this feature are encoded as repeated pairs of
+                // integers.
+                // A detailed description of tags is located in sections
+                // 4.2 and 4.4 of the specification
+                repeated uint32 tags = 2 [ packed = true ];
+
+                // The type of geometry stored in this feature.
+                optional GeomType type = 3 [ default = UNKNOWN ];
+
+                // Contains a stream of commands and parameters (vertices).
+                // A detailed description on geometry encoding is located in 
+                // section 4.3 of the specification.
+                repeated uint32 geometry = 4 [ packed = true ];
+        }
+
+        // Layers are described in section 4.1 of the specification
+        message Layer {
+                // Any compliant implementation must first read the version
+                // number encoded in this message and choose the correct
+                // implementation for this version number before proceeding to
+                // decode other parts of this message.
+                required uint32 version = 15 [ default = 1 ];
+
+                required string name = 1;
+
+                // The actual features in this tile.
+                repeated Feature features = 2;
+
+                // Dictionary encoding for keys
+                repeated string keys = 3;
+
+                // Dictionary encoding for values
+                repeated Value values = 4;
+
+                // Although this is an "optional" field it is required by the specification.
+                // See https://github.com/mapbox/vector-tile-spec/issues/47
+                optional uint32 extent = 5 [ default = 4096 ];
+
+                extensions 16 to max;
+        }
+
+        repeated Layer layers = 3;
+
+        extensions 16 to 8191;
+}