Rectangle uniform scaling

New "ExpandRectangle" and "ShrinkRectangle" functions to save repetitive tasks.

src/raylib.h

@@ -1455,6 +1455,8 @@ RLAPI void DrawTextureNPatch(Texture2D texture, NPatchInfo nPatchInfo, Rectangle
 // Color/pixel related functions
 RLAPI bool ColorIsEqual(Color col1, Color col2);                            // Check if two colors are equal
 RLAPI Color Fade(Color color, float alpha);                                 // Get color with alpha applied, alpha goes from 0.0f to 1.0f
+RLAPI Rectangle ExpandRectangle(Rectangle rec, float expand);               // Expand a rectangle uniformly
+RLAPI Rectangle ShrinkRectangle(Rectangle rec, float shrink);               // Shrink a rectangle uniformly
 RLAPI int ColorToInt(Color color);                                          // Get hexadecimal value for a Color (0xRRGGBBAA)
 RLAPI Vector4 ColorNormalize(Color color);                                  // Get Color normalized as float [0..1]
 RLAPI Color ColorFromNormalized(Vector4 normalized);                        // Get Color from normalized values [0..1]

src/rtextures.c

@@ -4859,6 +4859,24 @@ Color Fade(Color color, float alpha)
     return result;
 }
 
+// Expand a rectangle uniformly
+Rectangle ExpandRectangle(Rectangle rec, float expand)
+{
+    rec.x -= expand / 2.0f;
+    rec.y -= expand / 2.0f;
+    rec.width += expand;
+    rec.height += expand;
+}
+
+// Shrink a rectangle uniformly
+Rectangle ShrinkRectangle(Rectangle rec, float shrink)
+{
+    rec.x += shrink / 2.0f;
+    rec.y += shrink / 2.0f;
+    rec.width -= shrink;
+    rec.height -= shrink;
+}
+
 // Get hexadecimal value for a Color
 int ColorToInt(Color color)
 {