Add static void Fl_Surface_Device::push_current(Fl_Surface_Device *new_current) and pop_current() to set/unset the current drawing surface.

git-svn-id: file:///fltk/svn/fltk/branches/branch-1.4@12140 ea41ed52-d2ee-0310-a9c1-e6b18d33e121

3 files changed, 13 insertions, 18 deletions

diff --git a/src/drivers/Xlib/Fl_Xlib_Copy_Surface_Driver.cxx b/src/drivers/Xlib/Fl_Xlib_Copy_Surface_Driver.cxx
index c439ddf94..156bd87d3 100644
--- a/src/drivers/Xlib/Fl_Xlib_Copy_Surface_Driver.cxx
+++ b/src/drivers/Xlib/Fl_Xlib_Copy_Surface_Driver.cxx
@@ -28,10 +28,10 @@
 
 class Fl_Xlib_Copy_Surface_Driver : public Fl_Copy_Surface_Driver {
   friend class Fl_Copy_Surface_Driver;
+  virtual void end_current_();
 protected:
   Fl_Offscreen xid;
   Window oldwindow;
-  Fl_Surface_Device *_ss;
   Fl_Xlib_Copy_Surface_Driver(int w, int h);
   ~Fl_Xlib_Copy_Surface_Driver();
   void set_current();
@@ -51,26 +51,22 @@ Fl_Copy_Surface_Driver *Fl_Copy_Surface_Driver::newCopySurfaceDriver(int w, int
 
 Fl_Xlib_Copy_Surface_Driver::Fl_Xlib_Copy_Surface_Driver(int w, int h) : Fl_Copy_Surface_Driver(w, h) {
   driver(new Fl_Translated_Xlib_Graphics_Driver());
-  Fl::first_window()->make_current();
-  oldwindow = fl_xid(Fl::first_window());
+  oldwindow = fl_window;
   xid = fl_create_offscreen(w,h);
-  _ss = NULL;
-  Fl_Surface_Device *present_surface = Fl_Surface_Device::surface();
-  Fl_Surface_Device::set_current();
-  fl_push_no_clip();
+  driver()->push_no_clip();
   fl_window = xid;
   driver()->color(FL_WHITE);
   driver()->rectf(0, 0, w, h);
-  present_surface->set_current();
   fl_window = oldwindow;
 }
 
 
 Fl_Xlib_Copy_Surface_Driver::~Fl_Xlib_Copy_Surface_Driver() {
-  fl_pop_clip();
+  driver()->pop_clip();
+  bool need_push = (Fl_Surface_Device::surface() != this);
+  if (need_push) Fl_Surface_Device::push_current(this);
   unsigned char *data = fl_read_image(NULL,0,0,width,height,0);
-  fl_window = oldwindow;
-  _ss->set_current();
+  if (need_push) Fl_Surface_Device::pop_current();
   Fl_X11_Screen_Driver::copy_image(data, width, height, 1);
   delete[] data;
   fl_delete_offscreen(xid);
@@ -79,11 +75,14 @@ Fl_Xlib_Copy_Surface_Driver::~Fl_Xlib_Copy_Surface_Driver() {
 
 
 void Fl_Xlib_Copy_Surface_Driver::set_current() {
+  oldwindow = fl_window;
   fl_window = xid;
-  if (!_ss) _ss = Fl_Surface_Device::surface();
   Fl_Surface_Device::set_current();
 }
 
+void Fl_Xlib_Copy_Surface_Driver::end_current_() {
+  fl_window = oldwindow;
+}
 
 void Fl_Xlib_Copy_Surface_Driver::translate(int x, int y) {
   ((Fl_Translated_Xlib_Graphics_Driver*)driver())->translate_all(x, y);
diff --git a/src/drivers/Xlib/Fl_Xlib_Graphics_Driver_image.cxx b/src/drivers/Xlib/Fl_Xlib_Graphics_Driver_image.cxx
index 7ecb5471e..96f8b0685 100644
--- a/src/drivers/Xlib/Fl_Xlib_Graphics_Driver_image.cxx
+++ b/src/drivers/Xlib/Fl_Xlib_Graphics_Driver_image.cxx
@@ -714,10 +714,9 @@ void Fl_Xlib_Graphics_Driver::draw(Fl_RGB_Image *img, int XP, int YP, int WP, in
       depth |= FL_IMAGE_WITH_ALPHA;
     }
     if (surface) {
-      Fl_Surface_Device *old_surf = Fl_Surface_Device::surface();
-      surface->set_current();
+      Fl_Surface_Device::push_current(surface);
       fl_draw_image(img->array, 0, 0, img->w(), img->h(), depth, img->ld());
-      old_surf->set_current();
+      Fl_Surface_Device::pop_current();
       *Fl_Graphics_Driver::id(img) = surface->get_offscreen_before_delete();
       delete surface;
     }
diff --git a/src/drivers/Xlib/Fl_Xlib_Image_Surface_Driver.cxx b/src/drivers/Xlib/Fl_Xlib_Image_Surface_Driver.cxx
index 022a94066..4ec2bd25d 100644
--- a/src/drivers/Xlib/Fl_Xlib_Image_Surface_Driver.cxx
+++ b/src/drivers/Xlib/Fl_Xlib_Image_Surface_Driver.cxx
@@ -29,7 +29,6 @@ class Fl_Xlib_Image_Surface_Driver : public Fl_Image_Surface_Driver {
   friend class Fl_Image_Surface;
   virtual void end_current_();
 public:
-  Fl_Surface_Device *previous;
   Window pre_window;
   int was_high;
   Fl_Xlib_Image_Surface_Driver(int w, int h, int high_res, Fl_Offscreen off);
@@ -46,7 +45,6 @@ Fl_Image_Surface_Driver *Fl_Image_Surface_Driver::newImageSurfaceDriver(int w, i
 }
 
 Fl_Xlib_Image_Surface_Driver::Fl_Xlib_Image_Surface_Driver(int w, int h, int high_res, Fl_Offscreen off) : Fl_Image_Surface_Driver(w, h, high_res, off) {
-  previous = 0;
   if (!off) {
     fl_open_display();
     offscreen = XCreatePixmap(fl_display, RootWindow(fl_display, fl_screen), w, h, fl_visual->depth);
@@ -61,7 +59,6 @@ Fl_Xlib_Image_Surface_Driver::~Fl_Xlib_Image_Surface_Driver() {
 
 void Fl_Xlib_Image_Surface_Driver::set_current() {
   pre_window = fl_window;
-  if (!previous) previous = Fl_Surface_Device::surface();
   Fl_Surface_Device::set_current();
   fl_window = offscreen;
   fl_push_no_clip();