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Doc: more detail about fl_clip_region() when drawing elsewhere than on the display

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ManoloFLTK 2020-04-26 11:31:11 +02:00
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6
FL/fl_draw.H
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@ -173,12 +173,18 @@ inline void fl_restore_clip() {
Replaces the top of the clipping stack with a clipping region of any shape. Replaces the top of the clipping stack with a clipping region of any shape.
Fl_Region is an operating system specific type. Fl_Region is an operating system specific type.
\note This function is mostly intended for internal use by the FLTK library
when drawing to the display.
Its effect can be null if the current drawing surface is not the display.
\param[in] r clipping region \param[in] r clipping region
*/ */
inline void fl_clip_region(Fl_Region r) { fl_graphics_driver->clip_region(r); } inline void fl_clip_region(Fl_Region r) { fl_graphics_driver->clip_region(r); }
/** /**
Returns the current clipping region. Returns the current clipping region.
\note This function is mostly intended for internal use by the FLTK library
when drawing to the display.
Its return value can be always NULL if the current drawing surface is not the display.
*/ */
inline Fl_Region fl_clip_region() { return fl_graphics_driver->clip_region(); } inline Fl_Region fl_clip_region() { return fl_graphics_driver->clip_region(); }