make get_tile_width() and get_tile_height() const methods

Author: soheilshahrouz

vpr/src/draw/draw_interposer.cpp

@@ -8,10 +8,10 @@
 #include "globals.h"
 
 void draw_interposer_cuts(ezgl::renderer* g) {
-    t_draw_state* draw_state = get_draw_state_vars();
+    const t_draw_state* draw_state = get_draw_state_vars();
     const DeviceContext& device_ctx = g_vpr_ctx.device();
     const DeviceGrid& grid = device_ctx.grid;
-    t_draw_coords* draw_coords = get_draw_coords_vars();
+    const t_draw_coords* draw_coords = get_draw_coords_vars();
 
     const std::vector<std::vector<int>>& horizontal_cuts = grid.get_horizontal_interposer_cuts();
     const std::vector<std::vector<int>>& vertical_cuts = grid.get_vertical_interposer_cuts();

vpr/src/draw/draw_types.cpp

@@ -82,11 +82,11 @@ t_draw_coords::t_draw_coords() {
     pin_size = 0;
 }
 
-float t_draw_coords::get_tile_width() {
+float t_draw_coords::get_tile_width() const {
     return tile_width;
 }
 
-float t_draw_coords::get_tile_height() {
+float t_draw_coords::get_tile_height() const {
     //For now, same as width
     return tile_width;
 }

vpr/src/draw/draw_types.h

@@ -456,10 +456,10 @@ struct t_draw_coords {
     }
 
     ///@brief returns tile width
-    float get_tile_width();
+    float get_tile_width() const;
 
     ///@brief returns tile width
-    float get_tile_height();
+    float get_tile_height() const;
 
     ///@brief returns bounding box for given pb in given clb
     ezgl::rectangle get_pb_bbox(ClusterBlockId clb_index, const t_pb_graph_node& pb_gnode);