diff options
| author | Albrecht Schlosser <albrechts.fltk@online.de> | 2019-01-11 19:54:49 +0100 |
|---|---|---|
| committer | Albrecht Schlosser <albrechts.fltk@online.de> | 2019-01-12 15:54:57 +0100 |
| commit | 8ba982ae379f8d277bd555742ffdb83f70b54f75 (patch) | |
| tree | b23010ba139d48a2f8ddfa03ec7e4c6745ad175b /FL/Fl_Cairo_Window.H | |
| parent | 1a1492a174fd0ec2942b16f4fc96f9cbd639675c (diff) | |
Fix Cairo callback drawing (needs flush)
This commit adds a cairo_surface flush after calling the draw callback.
This fixes the test/cairo_test demo program under Windows.
At least under Windows the Cairo callback used in Fl_Cairo_Window
didn't draw anything with current Windows 10, MinGW (32-bit) and
Cairo 1.15.12 for Windows. It worked well under Linux though. Anyway,
the flush should do no harm.
Diffstat (limited to 'FL/Fl_Cairo_Window.H')
| -rw-r--r-- | FL/Fl_Cairo_Window.H | 13 |
1 files changed, 9 insertions, 4 deletions
diff --git a/FL/Fl_Cairo_Window.H b/FL/Fl_Cairo_Window.H index ec2d74bb4..dcec92f48 100644 --- a/FL/Fl_Cairo_Window.H +++ b/FL/Fl_Cairo_Window.H @@ -59,10 +59,15 @@ protected: /** Overloaded to provide cairo callback support */ void draw() { Fl_Double_Window::draw(); - // manual method ? if yes explicitly get a cairo_context here - if (!Fl::cairo_autolink_context()) - Fl::cairo_make_current(this); - if (draw_cb_) draw_cb_(this, Fl::cairo_cc()); + if (draw_cb_) { // call the Cairo draw callback + // manual method ? if yes explicitly get a cairo_context here + if (!Fl::cairo_autolink_context()) + Fl::cairo_make_current(this); + draw_cb_(this, Fl::cairo_cc()); + // flush cairo drawings: necessary at least for Windows + cairo_surface_t *s = cairo_get_target(Fl::cairo_cc()); + cairo_surface_flush(s); + } } public: |