Hi Jim,
Good to hear you found a workaround and thanks for taking the time to share
with us.
I'm unfamiliar with gtkmm and the gory details of gdk-pixbuf, which is why I
didn't comment further.
best,
Richard.
On 19/07/2012, at 4:30 AM, JIm Charlton wrote:
> A final post about the problems with Gdk::Pixbuf::create() on OS X 10.7 using
> gtkmm-3.0...
>
> I have not found a way to make this call work on the MAC.
> I found a work-around. I needed to save the image drawn within a
> Cairo::Context (cr). Rather than getting a pixbuf from the Gdk::Window after
> rendering the image, I do a cr->push_group() before the cairo draw
> instructions. After drawing the image I do a Cairo::RefPtr<Cairo::Pattern>
> pattern_ = cr->pop_group(). This saves a pointer to the image. I can then
> render the image with cr->set_source(pattern_) and cr->paint(). Later, after
> placing some additional features on the image I can revert to the original
> image in pattern_ by wiping the context with cr->set_source_rgb(
> 0.9,0.9,0.9); cr->paint(), and then restore the original image as above.
>
> I am sure that most of my problems stem from a lack of familiarity with cairo
> and cairomm. But for now, I seem to have solved my immediate problems.
>
> Sorry I could not be more helpful with the bug in the gtkmm/gtk libraries on
> OS X.
>
> jim...
>
>
>
> On 12-07-14 05:08 PM, JIm Charlton wrote:
>> Further to my problem with a call to Gdk::Pixbuf::create(), I compiled the
>> gtk libraries with debugging support and ran my test program under gdb.
>> Here is the output from stepping into the Gdk library. Any suggestions on
>> where to go now? Exactly where do I file a bug with bugzilla? Sorry about
>> my ignorance! :-)
>> ********************
>> (gdb) break 134
>> Breakpoint 1 at 0x1000021b9: file main-2.cc, line 134.
>> (gdb) run
>> Starting program: /Users/jim-2/pixbuf_test/bin/Debug/myprog
>> Reading symbols for shared libraries
>> ++++++++++++++++++++++....................................................................................................................................................
>> done
>> Reading symbols for shared libraries . done
>> Reading symbols for shared libraries . done
>> Reading symbols for shared libraries . done
>> Reading symbols for shared libraries . done
>> Reading symbols for shared libraries . done
>> In Area::on_draw()...
>> In Area::on_draw()...
>> Realized 1
>>
>> Breakpoint 1, PlotTest::on_test_clicked (this=0x7fff5fbfee98) at
>> main-2.cc:134
>> warning: Source file is more recent than executable.
>> 134 Glib::RefPtr<Gdk::Pixbuf> pixbuf_ =
>> Gdk::Pixbuf::create(myarea.myarea_win_, 0,0,winw,winh);
>> (gdb) s
>> Gdk::Pixbuf::create (src=@0x7fff5fbfeee0, src_x=0, src_y=0, width=500,
>> height=300) at pixbuf.cc:381
>> 381 return Glib::RefPtr<Pixbuf>( new Pixbuf(src, src_x, src_y, width,
>> height) );
>> (gdb) s
>> Gdk::Pixbuf::Pixbuf (this=0x102543b90, src=@0x7fff5fbfeee0, src_x=0,
>> src_y=0, width=500, height=300)
>> at pixbuf.cc:68
>> 68 src->gobj(), src_x, src_y, width, height))
>> (gdb) s
>> Glib::ObjectBase::ObjectBase (this=0x102543ba0, __vtt_parm=0x100a005a8) at
>> objectbase.cc:49
>> 49 cpp_destruction_in_progress_ (false)
>> (gdb) s
>> 50 {}
>> (gdb) s
>>
>> (myprog:38919): glibmm-CRITICAL **: Glib::Interface::Interface(const
>> Glib::Interface_Class&): assertion `gobject_ != 0' failed
>>
>> (myprog:38919): GLib-GObject-CRITICAL **: g_object_unref: assertion
>> `G_IS_OBJECT (object)' failed
>> *********************
>>
>> Here is the program
>> *********************
>> #include <gtkmm/main.h>
>>
>> #include <gtkmm/box.h>
>> #include <gtkmm/window.h>
>>
>> #include <gtkmm/separator.h>
>> #include <gtkmm/textview.h>
>> #include <gtkmm.h>
>>
>> #include <gtkmm/drawingarea.h>
>>
>> #include <gtkmm/image.h>
>> #include <gtkmm/stock.h>
>> #include <iostream>
>> #include <cairomm/context.h>
>> #include <gtkmm/button.h>
>>
>>
>> class Area : public Gtk::DrawingArea
>> {
>> public:
>> Area();
>> virtual ~Area();
>> Glib::RefPtr<Gdk::Window> myarea_win_;
>> protected:
>> virtual bool on_draw(const Cairo::RefPtr<Cairo::Context>& cr);
>> virtual void on_realize();
>> };
>>
>> Area::Area()
>> {
>>
>> }
>>
>> Area::~Area()
>> {
>> }
>>
>> bool Area::on_draw(const Cairo::RefPtr<Cairo::Context>& cr)
>> {
>>
>> printf("In Area::on_draw()...\n");
>> return true;
>> }
>>
>> void Area::on_realize()
>> {
>> // We need to call the base on_realize()
>> Gtk::DrawingArea::on_realize();
>> myarea_win_ = get_window();
>>
>> }
>>
>> class PlotTest : public Gtk::Window
>> {
>> public:
>> PlotTest();
>> virtual ~PlotTest();
>>
>> protected:
>> Area myarea;
>>
>> //Signal handlers:
>> void on_close_clicked();
>> void on_test_clicked();
>>
>> //Child widgets:
>> Gtk::TextView t_view;
>> Gtk::Box m_Box_Top;
>> Gtk::Button m_Button_Close;
>> Gtk::Button m_Button_Test;
>> };
>>
>> PlotTest::PlotTest() :
>> m_Box_Top(Gtk::ORIENTATION_VERTICAL),
>> m_Button_Close("Close"),
>> m_Button_Test("Test Pixbuf Code")
>> {
>> // Set title and border of the window
>> set_title("Cairo Test");
>> set_border_width(0);
>>
>> add(m_Box_Top);
>>
>> // Add myarea to m_Box3. myarea is an Area object (see myarea.h)
>>
>> myarea.set_size_request(500, 300);
>>
>> m_Box_Top.pack_start(myarea);
>>
>> // Put Close button in Box2:
>> m_Box_Top.pack_start(m_Button_Close);
>> m_Box_Top.pack_start(m_Button_Test);
>>
>> m_Button_Close.set_can_default();
>> m_Button_Close.grab_default();
>>
>> // Connect the clicked signal of the button to
>> m_Button_Close.signal_clicked().connect(sigc::mem_fun(*this,
>> &PlotTest::on_close_clicked) );
>>
>> m_Button_Test.signal_clicked().connect(sigc::mem_fun(*this,
>> &PlotTest::on_test_clicked) );
>>
>> show_all();
>> }
>>
>> PlotTest::~PlotTest()
>> {
>> }
>>
>> void PlotTest::on_close_clicked()
>> {
>> hide(); //to close the application.
>> }
>>
>> void PlotTest::on_test_clicked()
>> {
>> int winx, winy, winw, winh;
>>
>> printf("Realized %i\n", myarea.get_realized());
>>
>> myarea.get_window()->get_geometry(winx, winy, winw, winh);
>>
>> Glib::RefPtr<Gdk::Pixbuf> pixbuf_ =
>> Gdk::Pixbuf::create(myarea.myarea_win_, 0,0,winw,winh);
>> }
>>
>> int main(int argc, char *argv[])
>> {
>> Gtk::Main kit(argc, argv);
>>
>> PlotTest Prog;
>> //Shows the window and returns when it is closed.
>>
>> Gtk::Main::run(Prog);
>>
>> return 0;
>> }
>> ****************************
>>
>>
>>
>> _______________________________________________
>> Gtk-osx-devel-list mailing list
>>
>> [email protected]
>> https://mail.gnome.org/mailman/listinfo/gtk-osx-devel-list
>
>
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