vectortile_layer_combine()

static VectorTile__Tile__Layer * vectortile_layer_combine ( const VectorTile__Tile__Layer *  layer1, const VectorTile__Tile__Layer *  layer2  )

static

Definition at line 1460 of file mvt.c.

{
        uint32_t i, j;
        int key2_offset, value2_offset;
        VectorTile__Tile__Layer *layer = palloc(sizeof(VectorTile__Tile__Layer));
        vector_tile__tile__layer__init(layer);
 
        /* Take globals from layer1 */
        layer->version = layer1->version;
        layer->name = pstrdup(layer1->name);
        layer->has_extent = layer1->has_extent;
        layer->extent = layer1->extent;
 
        /* Copy keys into new layer */
        j = 0;
        layer->n_keys = layer1->n_keys + layer2->n_keys;
        layer->keys = layer->n_keys ? palloc(layer->n_keys * sizeof(void*)) : NULL;
        for (i = 0; i < layer1->n_keys; i++)
                layer->keys[j++] = pstrdup(layer1->keys[i]);
        key2_offset = j;
        for (i = 0; i < layer2->n_keys; i++)
                layer->keys[j++] = pstrdup(layer2->keys[i]);
 
        /* Copy values into new layer */
        /* TODO, apply hash logic here too, so that merged tiles */
        /* retain unique value maps */
        layer->n_values = layer1->n_values + layer2->n_values;
        layer->values = layer->n_values ? palloc(layer->n_values * sizeof(void*)) : NULL;
        j = 0;
        for (i = 0; i < layer1->n_values; i++)
                layer->values[j++] = tile_value_copy(layer1->values[i]);
        value2_offset = j;
        for (i = 0; i < layer2->n_values; i++)
                layer->values[j++] = tile_value_copy(layer2->values[i]);
 
 
        layer->n_features = layer1->n_features + layer2->n_features;
        layer->features = layer->n_features ? palloc(layer->n_features * sizeof(void*)) : NULL;
        j = 0;
        for (i = 0; i < layer1->n_features; i++)
                layer->features[j++] = tile_feature_copy(layer1->features[i], 0, 0);
        for (i = 0; i < layer2->n_features; i++)
                layer->features[j++] = tile_feature_copy(layer2->features[i], key2_offset, value2_offset);
 
        return layer;
}

References tile_feature_copy(), and tile_value_copy().

Referenced by vectortile_tile_combine().

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