From b027d2ba57a8e0d6f0862e0a891ddd5dee4b02e2 Mon Sep 17 00:00:00 2001
From: ManoloFLTK <41016272+ManoloFLTK@users.noreply.github.com>
Date: Fri, 26 Feb 2021 18:00:07 +0100
Subject: Windows platform: use GDI+ to antialias oblique lines and curves.

---
 FL/Fl_Graphics_Driver.H |  2 ++
 FL/fl_draw.H            | 10 ++++++++++
 2 files changed, 12 insertions(+)

(limited to 'FL')

diff --git a/FL/Fl_Graphics_Driver.H b/FL/Fl_Graphics_Driver.H
index 67b7a31bd..5d03e2c43 100644
--- a/FL/Fl_Graphics_Driver.H
+++ b/FL/Fl_Graphics_Driver.H
@@ -374,6 +374,8 @@ public:
   virtual float override_scale();
   virtual void restore_scale(float);
   virtual PangoFontDescription* pango_font_description(Fl_Font fnum) { return NULL; }
+  virtual void antialias(int state);
+  virtual int antialias();
 };
 
 #ifndef FL_DOXYGEN
diff --git a/FL/fl_draw.H b/FL/fl_draw.H
index a84f310f8..9e2e4b3dd 100644
--- a/FL/fl_draw.H
+++ b/FL/fl_draw.H
@@ -238,6 +238,16 @@ enum {
   FL_JOIN_BEVEL = 0x3000        ///< join style: line join is tidied
 };
 
+/**
+ Turns ON or OFF antialiased line drawings, if supported by platform.
+ Currently, only the Windows platform allows to change whether line drawings are antialiased.
+ Turning it OFF may accelerate heavy drawing operations.
+ */
+inline void fl_antialias(int state) { fl_graphics_driver->antialias(state); }
+
+/** Returns whether line drawings are currently antialiased */
+inline int fl_antialias() { return fl_graphics_driver->antialias(); }
+
 // rectangles tweaked to exactly fill the pixel rectangle:
 
 /**
-- 
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