Modifies some Image functions

REVIEWED: ImageDrawRectangle()
ADDED: ImageDrawRectangleLines()

src/raylib.h

@@ -1034,7 +1034,8 @@ RLAPI Color *ImageExtractPalette(Image image, int maxPaletteSize, int *extractCo
 RLAPI Image ImageText(const char *text, int fontSize, Color color);                                      // Create an image from text (default font)
 RLAPI Image ImageTextEx(Font font, const char *text, float fontSize, float spacing, Color tint);         // Create an image from text (custom sprite font)
 RLAPI void ImageDraw(Image *dst, Image src, Rectangle srcRec, Rectangle dstRec);                         // Draw a source image within a destination image
-RLAPI void ImageDrawRectangle(Image *dst, Vector2 position, Rectangle rec, Color color);                 // Draw rectangle within an image
+RLAPI void ImageDrawRectangle(Image *dst, Rectangle rec, Color color);                                   // Draw rectangle within an image
+RLAPI void ImageDrawRectangleLines(Image *dst, Rectangle rec, int thick, Color color);                   // Draw rectangle lines within an image
 RLAPI void ImageDrawText(Image *dst, Vector2 position, const char *text, int fontSize, Color color);     // Draw text (default font) within an image (destination)
 RLAPI void ImageDrawTextEx(Image *dst, Vector2 position, Font font, const char *text, float fontSize, float spacing, Color color); // Draw text (custom sprite font) within an image (destination)
 RLAPI void ImageFlipVertical(Image *image);                                                              // Flip image vertically

src/textures.c

@@ -1731,17 +1731,22 @@ Image ImageTextEx(Font font, const char *text, float fontSize, float spacing, Co
 }
 
 // Draw rectangle within an image
-void ImageDrawRectangle(Image *dst, Vector2 position, Rectangle rec, Color color)
+void ImageDrawRectangle(Image *dst, Rectangle rec, Color color)
 {
     Image imRec = GenImageColor((int)rec.width, (int)rec.height, color);
-
-    Rectangle dstRec = { position.x, position.y, (float)imRec.width, (float)imRec.height };
-
-    ImageDraw(dst, imRec, rec, dstRec);
-
+    ImageDraw(dst, imRec, (Rectangle){ 0, 0, rec.width, rec.height }, rec);
     UnloadImage(imRec);
 }
 
+// Draw rectangle lines within an image
+void ImageDrawRectangleLines(Image *dst, Rectangle rec, int thick, Color color)
+{
+    ImageDrawRectangle(&dst, (Rectangle){ rec.x, rec.y, rec.width, thick }, color);
+    ImageDrawRectangle(&dst, (Rectangle){ rec.x, rec.y + thick, thick, rec.height - thick*2 }, color);
+    ImageDrawRectangle(&dst, (Rectangle){ rec.x + rec.width - thick, rec.y + thick, thick, rec.height - thick*2 }, color);
+    ImageDrawRectangle(&dst, (Rectangle){ rec.x, rec.height - thick, rec.width, thick }, color);
+}
+
 // Draw text (default font) within an image (destination)
 void ImageDrawText(Image *dst, Vector2 position, const char *text, int fontSize, Color color)
 {