Added ability to draw a non-filled rectangle

src/GameEngine.c

@@ -16,6 +16,7 @@
 #include "SDL_ttf.h"
 #include "SDL_video.h"
 #include "Window.h"
+#include "aliases.h"
 #include "constants.h"
 #include "engine_build_config.h"
 #include "reusable_ids.h"
@@ -213,12 +214,17 @@ WindowDrawingArea get_window_drawing_area() {
   return GameEngine.window.drawing_area;
 }
 
+void draw_rectangle(RenderRect rect, SDL_Color color) {
+  draw_rect(GameEngine.window.renderer, color, rect.x, rect.y, rect.width,
+            rect.height);
+}
+
 void fill_rectangle(RenderRect rect, SDL_Color color) {
   fill_rect(GameEngine.window.renderer, color, rect.x, rect.y, rect.width,
             rect.height);
 }
 
-void clip_source_rect_to_drawing_area(RenderRect *src, RenderRect *dest) {
+void clip_render_rects_to_drawing_area(RenderRect *src, RenderRect *dest) {
   WindowDrawingArea area = get_window_drawing_area();
 
   // If the rectangle is completely out of bounds, set its width and height to 0
@@ -256,14 +262,16 @@ void clip_source_rect_to_drawing_area(RenderRect *src, RenderRect *dest) {
     y_clip = (dest->y + dest->height) - (area.y + area.height);
   }
 
-  // Offset and clipping of source rectangle needs to be calculated based on the
-  // ratio of the x_clip and y_clip variables to the width and height of the
-  // destination rectangle respectively. This is because the source rectangle's
-  // width and height might be different from the destination's
-  src->x += ((x_offset / dest->width) * src->width);
-  src->y += ((y_offset / dest->height) * src->height);
-  src->width *= 1 - (x_clip / dest->width);
-  src->height *= 1 - (y_clip / dest->height);
+  if (src) {
+    // Offset and clipping of source rectangle needs to be calculated based on
+    // the ratio of the x_clip and y_clip variables to the width and height of
+    // the destination rectangle respectively. This is because the source
+    // rectangle's width and height might be different from the destination's
+    src->x += ((x_offset / dest->width) * src->width);
+    src->y += ((y_offset / dest->height) * src->height);
+    src->width *= 1 - (x_clip / dest->width);
+    src->height *= 1 - (y_clip / dest->height);
+  }
 
   dest->x += x_offset;
   dest->y += y_offset;

src/Renderer.c

@@ -49,6 +49,15 @@ void render_clear(const Renderer *renderer, SDL_Color color) {
   SDL_RenderClear(renderer->SDL_base_renderer);
 }
 
+void draw_rect(const Renderer *renderer, SDL_Color color, float x, float y,
+               float w, float h) {
+  SDL_FRect dest = {x, y, w, h};
+
+  SDL_SetRenderDrawColor(renderer->SDL_base_renderer, color.r, color.g, color.b,
+                         color.a);
+  SDL_RenderDrawRectF(renderer->SDL_base_renderer, &dest);
+}
+
 void fill_rect(const Renderer *renderer, SDL_Color color, float x, float y,
                float w, float h) {
   SDL_FRect dest = {x, y, w, h};