This example code shows how to subclass Fl_Surface_Device and Fl_Graphics_Driver to
endow FLTK with a new kind of graphics output.
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The original intention of FL_PORTING was to mark all places in the
source code where changes are required to port FLTK to a new platform.
Thanks to the driver system, this approach has become somewhat
misleading, so I removed all references.
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Tested on Windows and Linux (not tested on MacOS/Android).
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This allows to keep class Fl_Screen_Driver away from the public API.
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This function is replaced by static Fl_Window_Driver* Fl_Window_Driver::(const Fl_Window *win).
The purpose is to have class Fl_Window_Driver outside from FLTK ABI.
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The new function names begin_job() and begin_page() better match end_job() and end_page() with which
they must be used by pair.
The old names start_job() and start_page() are maintained for API compatibility with FLTK 1.3.x
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which tries to keep the menu synchronized with the Fl_Input field,
assuming there's a match.
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Change Fl_Cocoa_Screen_Driver::read_win_rectangle() so it captures only
from the current window and ignores its subwindows, as do other Fl_Screen_Driver derived classes.
Remove Fl_Cocoa_Printer_Driver::print_window_part() that is no longer necessary.
Remove Fl_Printer::print_widget() and Fl_Printer::print_window_part() that
are no longer necessary.
Stop Fl_Widget_Surface::print_window_part() from being virtual because its platform-independent
implementation should suffice.
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The caller no longer needs to call Fl_Image_Surface::get_offscreen_before_delete() before object deletion,
because the object destructor knows the offscreen has not been created by the Fl_Image_Surface constructor.
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Graphics drivers now use up to 6 virtual member functions to support Fl_Image
drawing in the context of GUI and image rescaling :
virtual void draw_pixmap(Fl_Pixmap *pxm, int XP, int YP, int WP, int HP, int cx, int cy)
virtual void draw_bitmap(Fl_Bitmap *bm, int XP, int YP, int WP, int HP, int cx, int cy)
virtual void draw_rgb(Fl_RGB_Image *rgb, int XP, int YP, int WP, int HP, int cx, int cy)
and
virtual void draw_fixed(Fl_Pixmap *pxm, int XP, int YP, int WP, int HP, int cx, int cy)
virtual void draw_fixed(Fl_Bitmap *bm, int XP, int YP, int WP, int HP, int cx, int cy)
virtual void draw_fixed(Fl_RGB_Image *rgb, int XP, int YP, int WP, int HP, int cx, int cy)
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Fl_Rect.H is no longer included by Fl_Group.H to avoid unnecessary
dependencies on Fl_Rect.H. Currently it is only needed to access the
array returned by the protected method bounds().
Also clarified documentation.
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