The description of Cairo::ImageSurface,
http://cairographics.org/documentation/cairomm/reference/classCairo_1_1ImageSurface.html#_details,
says "if you modify anything and later want to continue to draw to the
surface with cairo, you must let cairo know via
Cairo::Surface::mark_dirty()
<http://cairographics.org/documentation/cairomm/reference/classCairo_1_1Surface.html#a77b1f860cc55f4ad168e100108e0b7bb>."
I added
surface->mark_dirty();
before
m_face_image.set(surface);
and suddenly it works.
Kjell
Den 2015-08-01 09:50, Adam Nielsen skrev:
Interesting, thanks for checking. Here is a patch for examplewindow.cc
that demonstrates the problem. Must be something to do with the way the
surface is created?
Thanks again,
Adam.
diff -Nru gtk.orig/examplewindow.cc gtk/examplewindow.cc
--- gtk.orig/examplewindow.cc 2015-08-01 17:34:59.000000000 +1000
+++ gtk/examplewindow.cc 2015-08-01 17:44:54.682482453 +1000
@@ -14,6 +14,7 @@
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
+#include <cairomm/cairomm.h>
#include "examplewindow.h"
ExampleWindow::ExampleWindow()
@@ -31,7 +32,19 @@
settings->property_gtk_application_prefer_dark_theme().set_value(true);
// Face
- m_face_image.set_from_icon_name("face-cool", Gtk::ICON_SIZE_DIALOG);
+ auto surface = Cairo::ImageSurface::create(Cairo::FORMAT_ARGB32, 16, 16);
+
+ // Draw something onto the Cairo surface so you can see whether it worked
+ auto content = surface->get_data();
+ for (int i = 0; i < 16*16*4; i+=4) {
+ content[i+0] = content[i+1] = content[i+2] = ((i/4)%16)<<4;
+ content[i+3] = 255;
+ }
+ // Set the Cairo surface - this doesn't work
+ m_face_image.set(surface);
+ // Convert the Cairo surface to a GDK pixbuf and set that, this does work
+ //auto gdkimg = Gdk::Pixbuf::create(surface, 0, 0, 16, 16);
+ //m_face_image.set(gdkimg);
// Center widget layout
m_prev_button.set_image_from_icon_name("go-previous-symbolic",
Gtk::ICON_SIZE_BUTTON, true);
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