Add one argument to Fl_Screen_Driver::read_win_rectangle()

The new argument gives the window to be captured, or NULL to indicate capture
from the current offscreen.
Calling this function becomes easier because less dependent on global variables.

1 files changed, 6 insertions, 10 deletions

diff --git a/src/drivers/X11/Fl_X11_Window_Driver.cxx b/src/drivers/X11/Fl_X11_Window_Driver.cxx
index e2ed5d073..1de2e5297 100644
--- a/src/drivers/X11/Fl_X11_Window_Driver.cxx
+++ b/src/drivers/X11/Fl_X11_Window_Driver.cxx
@@ -392,16 +392,14 @@ void Fl_X11_Window_Driver::free_icons() {
  
  This function exploits a feature of Fl_X11_Screen_Driver::read_win_rectangle() which,
  when called with negative 3rd argument, captures the window decoration.
- Other requirements to capture the window decoration:
- - fl_window is the parent window of the top window
- - Fl_Window::current() is the top window
+ Other requirement to capture the window decoration:
+   fl_window is the parent window of the top window
  */
 void Fl_X11_Window_Driver::capture_titlebar_and_borders(Fl_RGB_Image*& top, Fl_RGB_Image*& left, Fl_RGB_Image*& bottom, Fl_RGB_Image*& right)
 {
   top = left = bottom = right = NULL;
   if (pWindow->decorated_h() == h()) return;
   Window from = fl_window;
-  Fl_Window *oldcurrent = Fl_Window::current();
   Window root, parent, *children, child_win, xid = fl_xid(pWindow);
   unsigned n = 0;
   int do_it;
@@ -414,25 +412,23 @@ void Fl_X11_Window_Driver::capture_titlebar_and_borders(Fl_RGB_Image*& top, Fl_R
   float s = Fl::screen_driver()->scale(screen_num());
   htop /= s; wsides /= s;
   fl_window = parent;
-  current(pWindow);
   if (htop) {
-    top = Fl::screen_driver()->read_win_rectangle(0, 0, - (w() + 2 * wsides), htop);
+    top = Fl::screen_driver()->read_win_rectangle(0, 0, - (w() + 2 * wsides), htop, pWindow);
     if (top) top->scale(w() + 2 * wsides, htop, 0, 1);
   }
   if (wsides) {
-    left = Fl::screen_driver()->read_win_rectangle(0, htop, -wsides, h());
+    left = Fl::screen_driver()->read_win_rectangle(0, htop, -wsides, h(), pWindow);
     if (left) {
       left->scale(wsides, h(), 0, 1);
     }
-    right = Fl::screen_driver()->read_win_rectangle(w() + wsides, htop, -wsides, h());
+    right = Fl::screen_driver()->read_win_rectangle(w() + wsides, htop, -wsides, h(), pWindow);
     if (right) {
       right->scale(wsides, h(), 0, 1);
     }
-    bottom = Fl::screen_driver()->read_win_rectangle(0, htop + h(), -(w() + 2*wsides), hbottom);
+    bottom = Fl::screen_driver()->read_win_rectangle(0, htop + h(), -(w() + 2*wsides), hbottom, pWindow);
     if (bottom) {
       bottom->scale(w() + 2*wsides, wsides, 0, 1);
     }  }
-  current(oldcurrent);
   fl_window = from;
 }