Windows platform: use GDI+ to antialias oblique lines and curves.

1 files changed, 43 insertions, 0 deletions

diff --git a/src/drivers/GDI/Fl_GDI_Graphics_Driver.cxx b/src/drivers/GDI/Fl_GDI_Graphics_Driver.cxx
index 3fe721907..0ee5cf99f 100644
--- a/src/drivers/GDI/Fl_GDI_Graphics_Driver.cxx
+++ b/src/drivers/GDI/Fl_GDI_Graphics_Driver.cxx
@@ -22,15 +22,58 @@
 #include <FL/fl_draw.H>
 #include "../../Fl_Screen_Driver.H"
 
+#if USE_GDIPLUS
+static ULONG_PTR gdiplusToken = 0;
+
+Fl_GDIplus_Graphics_Driver::Fl_GDIplus_Graphics_Driver() : Fl_GDI_Graphics_Driver() {
+  if (!fl_current_xmap) color(FL_BLACK);
+  pen_ = new Gdiplus::Pen(gdiplus_color_, 1);
+  pen_->SetLineJoin(Gdiplus::LineJoinRound);
+  pen_->SetStartCap(Gdiplus::LineCapFlat);
+  pen_->SetEndCap(Gdiplus::LineCapFlat);
+  brush_ = new Gdiplus::SolidBrush(gdiplus_color_);
+  active = true;
+}
+
+Fl_GDIplus_Graphics_Driver::~Fl_GDIplus_Graphics_Driver() {
+  delete pen_;
+  delete brush_;
+}
+
+void Fl_GDIplus_Graphics_Driver::antialias(int state) {
+  active = state;
+}
+
+int Fl_GDIplus_Graphics_Driver::antialias() {
+  return active;
+}
+
+#endif
+
 /*
  * By linking this module, the following static method will instantiate the
  * Windows GDI Graphics driver as the main display driver.
  */
 Fl_Graphics_Driver *Fl_Graphics_Driver::newMainGraphicsDriver()
 {
+#if USE_GDIPLUS
+  // Initialize GDI+.
+  static Gdiplus::GdiplusStartupInput gdiplusStartupInput;
+  if (gdiplusToken == 0) GdiplusStartup(&gdiplusToken, &gdiplusStartupInput, NULL);
+
+  Fl_Graphics_Driver *driver = new Fl_GDIplus_Graphics_Driver();
+  return driver;
+#else
   return new Fl_GDI_Graphics_Driver();
+#endif
 }
 
+#if USE_GDIPLUS
+void Fl_GDIplus_Graphics_Driver::shutdown() {
+  Gdiplus::GdiplusShutdown(gdiplusToken);
+}
+#endif
+
 // Code used to switch output to an off-screen window.  See macros in
 // win32.H which save the old state in local variables.