diff options
| -rw-r--r-- | FL/Fl_Graphics_Driver.H | 2 | ||||
| -rw-r--r-- | documentation/src/drawing.dox | 4 | ||||
| -rw-r--r-- | src/Fl_Image_Surface.cxx | 5 |
3 files changed, 9 insertions, 2 deletions
diff --git a/FL/Fl_Graphics_Driver.H b/FL/Fl_Graphics_Driver.H index daa1232ca..0c98afdad 100644 --- a/FL/Fl_Graphics_Driver.H +++ b/FL/Fl_Graphics_Driver.H @@ -225,7 +225,7 @@ public: Fl_Graphics_Driver(); virtual ~Fl_Graphics_Driver() {} ///< Destructor static Fl_Graphics_Driver &default_driver(); - /** Current scale factor between FLTK and graphical coordinates: graphical = FLTK * scale() */ + /** Current scale factor between FLTK and drawing units: drawing = FLTK * scale() */ float scale() { return scale_; } /** Return whether the graphics driver can do alpha blending */ virtual char can_do_alpha_blending() { return 0; } diff --git a/documentation/src/drawing.dox b/documentation/src/drawing.dox index c6e8e8843..178843f2c 100644 --- a/documentation/src/drawing.dox +++ b/documentation/src/drawing.dox @@ -1154,6 +1154,10 @@ void fl_copy_offscreen(int x, int y, int w, int h, Fl_Offscreen osrc, int srcx, Copy a rectangular area of the size \p w*h from \p srcx,srcy in the offscreen buffer into the current drawing surface at \p x,y. +void fl_scale_offscreen(Fl_Offscreen &osrc) +\par +Adapts the offscreen's size in pixels to a changed value of the scale factor +while keeping the offscreen's graphical content. \htmlonly <hr> diff --git a/src/Fl_Image_Surface.cxx b/src/Fl_Image_Surface.cxx index bf115dcfa..9333d858a 100644 --- a/src/Fl_Image_Surface.cxx +++ b/src/Fl_Image_Surface.cxx @@ -186,9 +186,12 @@ void fl_end_offscreen() { Fl_Surface_Device::pop_current(); } -/** Adapts an offscreen buffer to a changed value of the graphical scaling factor. +/** Adapts an offscreen buffer to a changed value of the scale factor. The \p ctx argument must have been created by fl_create_offscreen() and the calling context must not be between fl_begin_offscreen() and fl_end_offscreen(). + The graphical content of the offscreen is preserved. The current scale factor + value is given by <tt>Fl_Graphics_Driver::default_driver().scale()</tt>. + \version 1.4 */ void fl_scale_offscreen(Fl_Offscreen &ctx) { int i, w, h; |