Fix regression calling fl_font() w/o draw context

According to the documentation fl_font(face, size) may be called
"outside a draw context if necessary to call fl_width()".

This worked in 1.3.5 but did not in 1.4 (so far). I reworded the
docs to make clear that other measurement functions can be called
as well and refactored the code to make sure that fl_font(face, size)
will open the display if necessary.

1 files changed, 3 insertions, 8 deletions

diff --git a/FL/fl_draw.H b/FL/fl_draw.H
index 6854bcc7c..04d3b14d6 100644
--- a/FL/fl_draw.H
+++ b/FL/fl_draw.H
@@ -574,16 +574,11 @@ FL_EXPORT void fl_rescale_offscreen(Fl_Offscreen &ctx);
 /* NOTE: doxygen comments here to avoid triplication in os-specific sources */
 
 // Fonts:
-/**
+/*
   Sets the current font, which is then used in various drawing routines.
-  You may call this outside a draw context if necessary to call fl_width(),
-  but on X this will open the display.
-
-  The font is identified by a \p face and a \p size.
-  The size of the font is measured in pixels and not "points".
-  Lines should be spaced \p size pixels apart or more.
+  Implemented and documented in src/Fl_Graphics_Driver.cxx
 */
-inline void fl_font(Fl_Font face, Fl_Fontsize fsize) { fl_graphics_driver->font(face,fsize); }
+void fl_font(Fl_Font face, Fl_Fontsize fsize);
 
 /**
   Returns the \p face set by the most recent call to fl_font().