Added copy/paste from/to FLTK applications of graphical data.

Added Fl_Image_Surface class to draw into an Fl_Image object.

git-svn-id: file:///fltk/svn/fltk/branches/branch-1.3@10159 ea41ed52-d2ee-0310-a9c1-e6b18d33e121

1 files changed, 158 insertions, 0 deletions

diff --git a/src/Fl_Image_Surface.cxx b/src/Fl_Image_Surface.cxx
new file mode 100644
index 000000000..047de7b57
--- /dev/null
+++ b/src/Fl_Image_Surface.cxx
@@ -0,0 +1,158 @@
+//
+// "$Id: Fl_Image_Surface.cxx 9869 2013-04-09 20:11:28Z greg.ercolano $"
+//
+// Draw-to-image code for the Fast Light Tool Kit (FLTK).
+//
+// Copyright 1998-2014 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:
+//
+//     http://www.fltk.org/COPYING.php
+//
+// Please report all bugs and problems on the following page:
+//
+//     http://www.fltk.org/str.php
+//
+
+#include <FL/Fl_Image_Surface.H>
+#include <FL/Fl_Printer.H>
+#include <FL/Fl.H>
+
+
+const char *Fl_Image_Surface::class_id = "Fl_Image_Surface";
+
+/** The constructor.
+ \param w and \param h give the size in pixels of the resulting image.
+ */
+Fl_Image_Surface::Fl_Image_Surface(int w, int h) : Fl_Surface_Device(NULL) {
+  width = w;
+  height = h;
+#if !(defined(__APPLE__) || defined(WIN32))
+  gc = 0;
+  if (!fl_display) { // allows use of this class before any window is shown
+    fl_open_display();
+    gc = XCreateGC(fl_display, RootWindow(fl_display, fl_screen), 0, 0);
+    fl_gc = gc;
+    }
+#endif
+  offscreen = fl_create_offscreen(w, h);
+#ifdef __APPLE__
+  helper = new Fl_Quartz_Flipped_Surface_(width, height);
+  driver(helper->driver());
+#elif defined(WIN32)
+  helper = new Fl_GDI_Surface_();
+  driver(helper->driver());
+#else
+  helper = new Fl_Xlib_Surface_();
+  driver(helper->driver());
+#endif
+}
+
+/** The destructor.
+ */
+Fl_Image_Surface::~Fl_Image_Surface() {
+  fl_delete_offscreen(offscreen);
+#ifdef __APPLE__
+  delete (Fl_Quartz_Flipped_Surface_*)helper;
+#elif defined(WIN32)
+  delete (Fl_GDI_Surface_*)helper;
+#else
+  if (gc) { XFreeGC(fl_display, gc); fl_gc = 0; }
+  delete (Fl_Xlib_Surface_*)helper;
+#endif
+}
+
+/** Returns the image made of all drawings sent to the Fl_Image_Surface object.
+ The returned object can be safely cast to Fl_RGB_Image* and contains its own copy
+ of the RGB data.
+ */
+Fl_Image* Fl_Image_Surface::image()
+{
+  unsigned char *data;
+#ifdef __APPLE__
+  CGContextFlush(offscreen);
+  data = fl_read_image(NULL, 0, 0, width, height, 0);
+  fl_end_offscreen();
+#elif defined(WIN32)
+  fl_pop_clip(); 
+  data = fl_read_image(NULL, 0, 0, width, height, 0);
+  RestoreDC(fl_gc, _savedc); 
+  DeleteDC(fl_gc); 
+  _ss->set_current(); 
+  fl_window=_sw; 
+  fl_gc = _sgc;
+#else
+  fl_pop_clip(); 
+  data = fl_read_image(NULL, 0, 0, width, height, 0);
+  fl_window = pre_window; 
+  previous->set_current();
+#endif
+  Fl_RGB_Image *image = new Fl_RGB_Image(data, width, height);
+  image->alloc_array = 1;
+  return image;
+}
+
+/** Draws a widget in the image surface
+ 
+ \param widget any FLTK widget (e.g., standard, custom, window, GL view) to draw in the image
+ \param delta_x and \param delta_y give 
+ the position in the image of the top-left corner of the widget
+ */
+void Fl_Image_Surface::draw(Fl_Widget *widget, int delta_x, int delta_y)
+{
+  helper->print_widget(widget, delta_x, delta_y);
+}
+
+
+void Fl_Image_Surface::set_current()
+{
+#if defined(__APPLE__)
+  fl_begin_offscreen(offscreen);
+  fl_pop_clip();
+  Fl_Surface_Device::set_current(); 
+  fl_push_no_clip();
+#elif defined(WIN32)
+  _sgc=fl_gc; 
+  _sw=fl_window;
+  _ss = Fl_Surface_Device::surface(); 
+  Fl_Surface_Device::set_current();
+  fl_gc = fl_makeDC(offscreen); 
+   _savedc = SaveDC(fl_gc); 
+  fl_window=(HWND)offscreen; 
+  fl_push_no_clip();
+#else
+  pre_window = fl_window; 
+  fl_window = offscreen; 
+  previous = Fl_Surface_Device::surface(); 
+  Fl_Surface_Device::set_current();
+  fl_push_no_clip();
+#endif
+}
+
+#if defined(__APPLE__)
+
+Fl_Quartz_Flipped_Surface_::Fl_Quartz_Flipped_Surface_(int w, int h) : Fl_Quartz_Surface_(w, h) {
+}
+
+void Fl_Quartz_Flipped_Surface_::translate(int x, int y) {
+  CGContextRestoreGState(fl_gc);
+  CGContextSaveGState(fl_gc);
+  CGContextTranslateCTM(fl_gc, x, -y);
+  CGContextSaveGState(fl_gc);
+  CGContextTranslateCTM(fl_gc, 0, height);
+  CGContextScaleCTM(fl_gc, 1.0f, -1.0f);
+}
+
+void Fl_Quartz_Flipped_Surface_::untranslate() {
+  CGContextRestoreGState(fl_gc);
+}
+
+const char *Fl_Quartz_Flipped_Surface_::class_id = "Fl_Quartz_Flipped_Surface_";
+
+#endif // __APPLE__
+
+//
+// End of "$Id: $".
+//