diff options
Diffstat (limited to 'documentation/src/osissues.dox')
| -rw-r--r-- | documentation/src/osissues.dox | 21 |
1 files changed, 13 insertions, 8 deletions
diff --git a/documentation/src/osissues.dox b/documentation/src/osissues.dox index 80edb3624..829c3d5e7 100644 --- a/documentation/src/osissues.dox +++ b/documentation/src/osissues.dox @@ -839,16 +839,21 @@ by \verbatim glViewport(0, 0, pixel_w(), pixel_h()); \endverbatim -making use of the Fl_Gl_Window::pixel_w() and Fl_Gl_Window::pixel_h() functions that return the width and height of -the GL scene in pixels: if the Fl_Gl_Window is mapped on a retina display, these functions return twice as much as -reported by Fl_Widget::w() and Fl_Widget::h(); if it's mapped on a regular display, they return the same values as w() and h(). -If you don't call Fl::use_high_res_GL(1), your Fl_Gl_Window 's will be drawn with low resolution. -These functions are synonyms of w() and h() on non-Mac OS X platforms, so your source code remains cross-platform. +making use of the Fl_Gl_Window::pixel_w() and Fl_Gl_Window::pixel_h() methods that return the width and height of +the GL scene in pixels: if the Fl_Gl_Window is mapped on a retina display, these methods return twice as much as +reported by Fl_Widget::w() and Fl_Widget::h(); if it's mapped on a regular display, they return the same values +as w() and h(). These methods dynamically change their values if the window is moved into/out from a retina +display. If Fl::use_high_res_GL(1) is not called, all Fl_Gl_Window 's are drawn at low resolution. +These methods are synonyms of w() and h() on non-Mac OS X platforms, so the source code remains cross-platform. -Fl_Double_Window +The Fl_Gl_Window::pixels_per_unit() method is useful when the OpenGL code depends on the pixel dimension +of the GL scene. This occurs, e.g., if a window's handle() method uses Fl::event_x() and Fl::event_y() +whose returned values should be multiplied by Fl_Gl_Window::pixels_per_unit() to obtain the adequate pixel units. +This method may also be useful, for example, to adjust the width of a line in a high resolution GL scene. -OS X double-buffers all windows automatically. On OS X, -Fl_Window and Fl_Double_Window are handled +\subsection double_window Fl_Double_Window + +OS X double-buffers all windows automatically. On OS X, Fl_Window and Fl_Double_Window are handled internally in the same way. \subsection osissues_mac_files Mac File System Specifics |