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.

---
 CMake/fl_create_example.cmake |  3 +++
 CMake/options.cmake           | 10 ++++++++++
 2 files changed, 13 insertions(+)

(limited to 'CMake')

diff --git a/CMake/fl_create_example.cmake b/CMake/fl_create_example.cmake
index 22c418bc6..38ffe98e1 100644
--- a/CMake/fl_create_example.cmake
+++ b/CMake/fl_create_example.cmake
@@ -123,6 +123,9 @@ macro (CREATE_EXAMPLE NAME SOURCES LIBRARIES)
       target_link_directories (${TARGET_NAME} PRIVATE ${PKG_CAIRO_LIBRARY_DIRS})
     endif()
   endif (FLTK_HAVE_CAIRO)
+  if (USE_GDIPLUS)        # can only be true on Windows
+    target_link_libraries (${TARGET_NAME} gdiplus)
+  endif (USE_GDIPLUS)
 
   if (MAC_BUNDLE)
     if (PLIST)
diff --git a/CMake/options.cmake b/CMake/options.cmake
index cf50da6b8..e9e7a1db0 100644
--- a/CMake/options.cmake
+++ b/CMake/options.cmake
@@ -52,6 +52,16 @@ if (UNIX)
   list (APPEND FLTK_LDLIBS -lm)
 endif (UNIX)
 
+if (WIN32)
+  option (OPTION_USE_GDIPLUS "use GDI+ when possible for antialiased graphics" ON)
+  if (OPTION_USE_GDIPLUS)
+    set (USE_GDIPLUS TRUE)
+    if (NOT MSVC)
+      list (APPEND FLTK_LDLIBS "-lgdiplus")
+    endif (NOT MSVC)
+  endif (OPTION_USE_GDIPLUS)
+endif (WIN32)
+
 #######################################################################
 if (APPLE)
   option (OPTION_APPLE_X11 "use X11" OFF)
-- 
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