2 files changed, 101 insertions, 0 deletions
diff --git a/src/drivers/Cairo/Fl_Display_Cairo_Graphics_Driver.H b/src/drivers/Cairo/Fl_Display_Cairo_Graphics_Driver.H
new file mode 100644
index 000000000..76986af9a
--- /dev/null
+++ b/src/drivers/Cairo/Fl_Display_Cairo_Graphics_Driver.H
@@ -0,0 +1,37 @@
+//
+// Support for using Cairo to draw into X11 windows for the Fast Light Tool Kit (FLTK).
+//
+// Copyright 2022 by Bill Spitzak and others.
+//
+// This library is free software. Distribution and use rights are outlined in
+// the file "COPYING" which should have been included with this file.  If this
+// file is missing or damaged, see the license at:
+//
+//     https://www.fltk.org/COPYING.php
+//
+// Please see the following page on how to report bugs and issues:
+//
+//     https://www.fltk.org/bugs.php
+//
+
+/* \file
+    Declaration of class Fl_Display_Cairo_Graphics_Driver.
+*/
+
+#ifndef FL_DISPLAY_CAIRO_GRAPHICS_DRIVER_H
+# define FL_DISPLAY_CAIRO_GRAPHICS_DRIVER_H
+
+#include "Fl_Cairo_Graphics_Driver.H"
+
+class Fl_Display_Cairo_Graphics_Driver : public Fl_Cairo_Graphics_Driver {
+private:
+  static void *gc_;
+public:
+  virtual void scale(float f);
+  virtual float scale() {return Fl_Graphics_Driver::scale();}
+  virtual void gc(void *value);
+  virtual void* gc();
+  virtual void copy_offscreen(int x, int y, int w, int h, Fl_Offscreen pixmap, int srcx, int srcy);
+ };
+
+#endif // FL_DISPLAY_CAIRO_GRAPHICS_DRIVER_H
diff --git a/src/drivers/Cairo/Fl_Display_Cairo_Graphics_Driver.cxx b/src/drivers/Cairo/Fl_Display_Cairo_Graphics_Driver.cxx
new file mode 100644
index 000000000..02df902d8
--- /dev/null
+++ b/src/drivers/Cairo/Fl_Display_Cairo_Graphics_Driver.cxx
@@ -0,0 +1,64 @@
+//
+// Support for using Cairo to draw into X11 windows for the Fast Light Tool Kit (FLTK).
+//
+// Copyright 2022 by Bill Spitzak and others.
+//
+// This library is free software. Distribution and use rights are outlined in
+// the file "COPYING" which should have been included with this file.  If this
+// file is missing or damaged, see the license at:
+//
+//     https://www.fltk.org/COPYING.php
+//
+// Please see the following page on how to report bugs and issues:
+//
+//     https://www.fltk.org/bugs.php
+//
+
+/* \file
+    Implementation of class Fl_Display_Cairo_Graphics_Driver .
+*/
+
+#include "Fl_Display_Cairo_Graphics_Driver.H"
+#include <FL/platform.H>
+#include <cairo/cairo.h>
+#include <pango/pangocairo.h>
+#include <stdlib.h>
+
+
+void *Fl_Display_Cairo_Graphics_Driver::gc_ = NULL;
+GC fl_gc;
+
+
+ulong fl_xpixel(uchar r,uchar g,uchar b) {
+  return 0;
+}
+ulong fl_xpixel(Fl_Color i) {
+    return 0;
+}
+
+
+void Fl_Display_Cairo_Graphics_Driver::scale(float f) {
+  Fl_Graphics_Driver::scale(f);
+  if (cairo_) {
+    cairo_restore(cairo_);
+    cairo_save(cairo_);
+    cairo_scale(cairo_, f, f);
+    cairo_translate(cairo_, 0.5, 0.5);
+  }
+}
+
+
+void Fl_Display_Cairo_Graphics_Driver::copy_offscreen(int x, int y, int w, int h, Fl_Offscreen pixmap, int srcx, int srcy) {
+  XCopyArea(fl_display, pixmap, fl_window, (GC)Fl_Graphics_Driver::default_driver().gc(), int(srcx*scale()), int(srcy*scale()), int(w*scale()), int(h*scale()), int(x*scale()), int(y*scale()));
+}
+
+
+void Fl_Display_Cairo_Graphics_Driver::gc(void *value) {
+  gc_ = value;
+  fl_gc = (GC)gc_;
+}
+
+
+void *Fl_Display_Cairo_Graphics_Driver::gc() {
+  return gc_;
+}