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//
// "$Id: Fl_Cairo.cxx 8198 2011-01-06 10:24:58Z manolo $"
//
// Main header file for the Fast Light Tool Kit (FLTK).
//
// Copyright 1998-2010 by Bill Spitzak and others.
//
// This library is free software; you can redistribute it and/or
// modify it under the terms of the GNU Library General Public
// License as published by the Free Software Foundation; either
// version 2 of the License, or (at your option) any later version.
//
// This library 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
// Library General Public License for more details.
//
// You should have received a copy of the GNU Library General Public
// License along with this library; if not, write to the Free Software
// Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
// USA.
//
// Please report all bugs and problems on the following page:
//
// http://www.fltk.org/str.php
//
#include <config.h>
#ifdef FLTK_HAVE_CAIRO
#include <FL/Fl.H>
#include <FL/x.H>
#include <FL/Fl_Window.H>
#ifdef __APPLE__
#include <Carbon/Carbon.h>
#endif
// static Fl module initialization :
Fl_Cairo_State Fl::cairo_state_; ///< contains all necesary info for current cairo context mapping
// Fl cairo features implementation
// Fl_Cairo_State class impl
void Fl_Cairo_State::autolink(bool b) {
#ifdef FLTK_USE_CAIRO
autolink_ = b;
#else
Fl::fatal("In Fl::autolink(bool) : Cairo autolink() feature is only "
"available with the enable-cairoext configure option, now quitting.");
#endif
}
/**
Provides a corresponding cairo context for window \a wi.
This is needed in a draw() override if Fl::cairo_autolink_context()
returns false, which is the default.
The cairo_context() does not need to be freed as it is freed every time
a new cairo context is created. When the program terminates,
a call to Fl::cairo_make_current(0) will destroy any residual context.
\note A new cairo context is not always re-created when this method
is used. In particular, if the current graphical context and the current
window didn't change between two calls, the previous gc is internally kept,
thus optimizing the drawing performances.
Also, after this call, Fl::cairo_gc() is adequately updated with this
cairo context.
\note Only available when configure has the --enable-cairo option
\return the valid cairo_t* cairo context associated to this window.
*/
cairo_t * Fl::cairo_make_current(Fl_Window* wi) {
if (!wi) return NULL; // Precondition
if (fl_gc==0) { // means remove current cc
Fl::cairo_cc(0); // destroy any previous cc
cairo_state_.window(0);
return 0;
}
// don't re-create a context if it's the same gc/window couple
if (fl_gc==Fl::cairo_state_.gc() && fl_xid(wi) == (Window) Fl::cairo_state_.window())
return Fl::cairo_cc();
cairo_state_.window(wi);
#if defined(USE_X11)
return Fl::cairo_make_current(0, wi->w(), wi->h());
#else
return Fl::cairo_make_current(fl_gc, wi->w(), wi->h());
#endif
}
/*
Creates transparently a cairo_surface_t object.
gc is an HDC context in WIN32, a CGContext* in Quartz, a display on X11
*/
static cairo_surface_t * cairo_create_surface(void * gc, int W, int H) {
# if defined(USE_X11)
return cairo_xlib_surface_create(fl_display, fl_window, fl_visual->visual, W, H);
# elif defined(WIN32)
return cairo_win32_surface_create((HDC) gc);
# elif defined(__APPLE_QUARTZ__)
return cairo_quartz_surface_create_for_cg_context((CGContext*) gc, W, H);
# else
# error Cairo is not supported under this platform.
# endif
}
/**
Creates a cairo context from a \a gc only, get its window size or offscreen size if fl_window is null.
\note Only available when configure has the --enable-cairo option
*/
cairo_t * Fl::cairo_make_current(void *gc) {
int W=0,H=0;
#if defined(USE_X11)
//FIXME X11 get W,H
// gc will be the window handle here
# warning FIXME get W,H for cairo_make_current(void*)
#elif defined(__APPLE_QUARTZ__)
if (fl_window) {
Rect portRect;
GetPortBounds(GetWindowPort( Fl_X::i(Fl_Window::current())->window_ref() ), &portRect);
W = portRect.right-portRect.left;
H = portRect.bottom-portRect.top;
}
else {
W = CGBitmapContextGetHeight(fl_gc);
H = CGBitmapContextGetHeight(fl_gc);
}
#elif defined(WIN32)
// we don't need any W,H for WIN32
#else
# error Cairo is not supported under this platform.
#endif
if (!gc) {
Fl::cairo_cc(0);
cairo_state_.gc(0); // keep track for next time
return 0;
}
if (gc==Fl::cairo_state_.gc() && fl_window== (Window) Fl::cairo_state_.window())
return Fl::cairo_cc();
cairo_state_.gc(fl_gc); // keep track for next time
cairo_surface_t * s = cairo_create_surface(gc, W, H);
cairo_t * c = cairo_create(s);
cairo_surface_destroy(s);
Fl::cairo_cc(c);
return c;
}
/**
Creates a cairo context from a \a gc and its size
\note Only available when configure has the --enable-cairo option
*/
cairo_t * Fl::cairo_make_current(void *gc, int W, int H) {
cairo_surface_t * s = cairo_create_surface(gc, W, H);
cairo_t * c = cairo_create(s);
cairo_surface_destroy(s);
Fl::cairo_cc(c);
return c;
}
#else
// just don't leave the libfltk_cairo lib empty to avoid warnings
#include <FL/Fl_Export.H>
FL_EXPORT int fltk_cairo_dummy() { return 1;}
#endif // FLTK_HAVE_CAIRO
//
// End of "$Id: Fl_Cairo.cxx 8198 2011-01-06 10:24:58Z manolo $" .
//
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