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Comments only: extend "Implementation note about image drawing" to describe the mask_bitmap virtual member function. 

git-svn-id: file:///fltk/svn/fltk/branches/branch-1.4@12845 ea41ed52-d2ee-0310-a9c1-e6b18d33e121
This commit is contained in:
Manolo Gouy 2018-04-16 13:21:54 +00:00
parent 447e33c607
commit c5ab11bbec
1 changed files with 2 additions and 0 deletions
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FL/Fl_Graphics_Driver.H
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@ -130,6 +130,8 @@ and
Graphics drivers also implement cache(Fl_Pixmap*), cache(Fl_Bitmap*) and cache(Fl_RGB_Image*)
to compute the cached form of all image types, and uncache(Fl_RGB_Image *,...),
uncache_pixmap(fl_uintptr_t) and delete_bitmask(Fl_Bitmask) to destroy cached image forms.
Graphics drivers that use the mask_ variable of class Fl_Pixmap to cache an Fl_Pixmap
object also reimplement the uchar **Fl_Graphics_Driver::mask_bitmap() member function.
*/
private:
virtual void draw_fixed(Fl_Pixmap *pxm,int XP, int YP, int WP, int HP, int cx, int cy) {}