Refactor code to make rounded rectangles accessible (#553)

This adds fl_rounded_rect and fl_rounded_rectf so the
user can draw rounded rectangles. This uses existing and
optimised code that is rearranged.

2 files changed, 20 insertions, 0 deletions

diff --git a/FL/Fl_Graphics_Driver.H b/FL/Fl_Graphics_Driver.H
index 5de983554..0f25756d6 100644
--- a/FL/Fl_Graphics_Driver.H
+++ b/FL/Fl_Graphics_Driver.H
@@ -264,6 +264,9 @@ public:
   virtual void rect(int x, int y, int w, int h);
   virtual void focus_rect(int x, int y, int w, int h);
   virtual void rectf(int x, int y, int w, int h);
+  virtual void _rbox(int fill, int x, int y, int w, int h, int r);
+  virtual void rounded_rect(int x, int y, int w, int h, int r);
+  virtual void rounded_rectf(int x, int y, int w, int h, int r);
   // the default implementation is most likely enough
   virtual void colored_rectf(int x, int y, int w, int h, uchar r, uchar g, uchar b);
   virtual void line(int x, int y, int x1, int y1);
diff --git a/FL/fl_draw.H b/FL/fl_draw.H
index 359405b7d..fc3e401ca 100644
--- a/FL/fl_draw.H
+++ b/FL/fl_draw.H
@@ -291,6 +291,15 @@ inline void fl_rect(int x, int y, int w, int h) {
 }
 
 /**
+ Draw a 1-pixel rounded border \e inside the given bounding box.
+ The radius code is optimized for speed and works best for values between
+ 5 and 15 units.
+ */
+inline void fl_rounded_rect(int x, int y, int w, int h, int r) {
+  fl_graphics_driver->rounded_rect(x, y, w, h, r);
+}
+
+/**
   Draw a 1-pixel border \e inside the given bounding box.
   This is the same as fl_rect(int x, int y, int w, int h) but with
   Fl_Rect \p r as input argument.
@@ -320,6 +329,14 @@ inline void fl_rectf(int x, int y, int w, int h) {
   fl_graphics_driver->rectf(x, y, w, h);
 }
 
+/** Color with current color a rounded rectangle that exactly fills the given bounding box.
+ The radius code is optimized for speed and works best for values between
+ 5 and 15 units.
+*/
+inline void fl_rounded_rectf(int x, int y, int w, int h, int r) {
+  fl_graphics_driver->rounded_rectf(x, y, w, h, r);
+}
+
 /** Color with passed color a rectangle that exactly fills the given bounding box. */
 inline void fl_rectf(int x, int y, int w, int h, Fl_Color c) {
   fl_color(c);