sdl2_guitk - C/C++ GUI toolkit designed for SDL2 environnements (GTK-style).



  Copyright (C) 2003-2015 Trave Roman

  sdl_guitk is free software; you can redistribute it and/or modify
  it under the terms of the GNU General Public License as published by
  the Free Software Foundation; either version 2 of the License, or
  (at your option) any later version.

  This program is distributed in the hope that it will be useful,
  but WITHOUT ANY WARRANTY; without even the implied warranty of
  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  GNU General Public License for more details.

  You should have received a copy of the GNU General Public License
  along with this program; if not, write to the Free Software
  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA

	- Trave Roman <roman.trave@abadcafe.org>



GOALS OF SDL_GuiTK
------------------

 * 	Providing a "light" but extended GUI for the great SDL library.
	To be fully implemented on SDL, using SDL_ttf for text layout.
	http://www.libsdl.org
 *	Providing a powerfull and lisible interface:
	dynamics of widgets and name-spacing copied from Gtk.
	(so for docs, see gtk-doc and substitutes gtk_ by SDLGuiTK_)
	http://www.gtk.org
 *	Providing two drawing contexts:
	- SELF_MODE, "a la Gtk" ou "a la paragui"
	- SLAVE_MODE, initialized on a external surface (integration)


DEVEL PLAN
----------

 0.3.0
 *	Structures and relevant attributes must be OK:
	widgets:         TextView.

 0.2.0
 *	Structures and relevant attributes must be OK:
	infrastructures: Cursor, Timer, Theme, threated Context.
	widgets:         Bitmap, DockedWin, Entry.

DEVEL STATUS
------------

 0.1.0 (cvs tag: rel-0-1-0)
 *	Structures and relevant attributes must be OK:
	infrastructures: Object, Widget, Signal, List.
	containers:      Container, Misc, Bin.
	widgets:         Window, Alignment, Box, Label, Button.
 *	SELF_MODE and SLAVE_MODE context modes are OK.
 *	Alpha blending OK for Linux and Win32.
 *	Internal structures attributes proposed:
	Context, Theme, WM(WindowManager layer).


OPENGL INTEGRATION
------------------


Note: SDL2 portage only support GL context for now.

GL context must be determinated in run-time.
If no GL found, SDLGuiTK uses 2D-Blit functions on the main surface.
For this purpose, concerned functions are layed by a (*function)().
They are setted in mysdl.c, when GL detection is done.
They are:
	MySDL_MainSurface_clean()		_GL() / _noGL()
	MySDL_SwapBuffers()			_GL() / _noGL()
	MyWM_blit2Dsurface()			_GL() / _noGL()


THREADED USE
------------

Like in GTK, a unique mutex protect internal structures.
Locked an unlocked by:
	SDLGuiTK_threads_enter()
	SDLGuiTK_threads_leave()