5175192755
- remove separate libfltk_cairo to avoid cyclic dependencies, but
- keep a dummy libfltk_cairo in 1.4.0 for backwards compatibility
- move cairo/Fl_Cairo.cxx to src/Fl_Cairo.cxx
- add preliminary Cairo support for Visual Studio (MSVC)
Static linking is not affected by this change, but users building
with hand-made Makefiles will have to remove libfltk_cairo starting
with FLTK 1.4.0. The dummy library can be linked for backwards
compatibility but it will be removed later (in 1.4.x or 1.5.0).
The shared FLTK library libfltk.{so|dylib|dll|..} depends on libcairo
if and only if FLTK is built with one of the Cairo options. This has
always been the case for OPTION_CAIROEXT but is now also true if only
OPTION_CAIRO is selected, i.e. FLTK programs linked with a Cairo
enabled shared FLTK library will also be linked with libcairo. The same
is true for configure options --enable-cairo and --enable-cairoext,
respectively.
Preliminary Cairo support for MSVC now detects a Cairo installation
using the CMake variable FLTK_CAIRO_DIR which must be set by the user.
Note that this feature is temporary and may be changed in the future
for a better and more comfortable version.
102 lines
3.4 KiB
C++
102 lines
3.4 KiB
C++
//
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// Main Cairo header file for the Fast Light Tool Kit (FLTK).
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//
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// Copyright 1998-2022 by Bill Spitzak and others.
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//
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// This library is free software. Distribution and use rights are outlined in
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// the file "COPYING" which should have been included with this file. If this
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// file is missing or damaged, see the license at:
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//
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// https://www.fltk.org/COPYING.php
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//
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// Please see the following page on how to report bugs and issues:
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//
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// https://www.fltk.org/bugs.php
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//
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/** \file Fl_Cairo.H
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Cairo is currently supported for the following platforms:
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Windows, macOS, Unix/Linux (X11 + Wayland).
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\note In FLTK 1.3.x this header file (Fl_Cairo.H) included the platform
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specific Cairo headers. This is no longer true since 1.4.0.
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This header file is platform agnostic. If you need platform specific Cairo
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headers you need to #include them in your source file.
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To use FLTK's builtin Cairo support you need to <tt>\#include \<FL/Fl.H></tt>
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\b before you include any other FLTK header which is officially required anyway.
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Since FLTK 1.4.0 the preprocessor constants \p FLTK_HAVE_CAIRO and/or
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\p FLTK_HAVE_CAIROEXT are defined in \<FL/Fl.H> by including \<FL/fl_config.h>.
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*/
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#ifndef FL_CAIRO_H
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#define FL_CAIRO_H
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#include <FL/Fl.H>
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# ifdef FLTK_HAVE_CAIRO
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# include <cairo.h>
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/**
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\addtogroup group_cairo
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@{
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*/
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/**
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Contains all the necessary info on the current cairo context.
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A private internal & unique corresponding object is created to
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permit cairo context state handling while keeping it opaque.
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For internal use only.
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\note Only available when configure has the --enable-cairo or
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--enable-cairoext option or one or both of the CMake options
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OPTION_CAIRO or OPTION_CAIROEXT is set (ON)
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*/
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class FL_EXPORT Fl_Cairo_State {
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public:
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Fl_Cairo_State()
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: cc_(0)
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, own_cc_(false)
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, autolink_(false)
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, window_(0)
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, gc_(0) {}
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// access attributes
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cairo_t *cc() const { return cc_; } ///< Gets the current cairo context
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bool autolink() const { return autolink_; } ///< Gets the autolink option. See Fl::cairo_autolink_context(bool)
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/** Sets the current cairo context.
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\p own == \e true (the default) indicates that the cairo context \p c
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will be deleted by FLTK internally when another cc is set later.
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\p own == \e false indicates cc deletion is handled externally
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by the user program.
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*/
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void cc(cairo_t *c, bool own = true) {
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if (cc_ && own_cc_)
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cairo_destroy(cc_);
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cc_ = c;
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if (!cc_)
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window_ = 0;
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own_cc_ = own;
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}
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void autolink(bool b); ///< Sets the autolink option, only available with --enable-cairoext
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void window(void *w) { window_ = w; } ///< Sets the window \p w to keep track on
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void *window() const { return window_; } ///< Gets the last window attached to a cc
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void gc(void *c) { gc_ = c; } ///< Sets the gc \p c to keep track on
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void *gc() const { return gc_; } ///< Gets the last gc attached to a cc
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private:
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cairo_t *cc_; // contains the unique autoupdated cairo context
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bool own_cc_; // indicates whether we must delete the cc, useful for internal cleanup
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bool autolink_; // false by default, prevents the automatic cairo mapping on fltk windows
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// for custom cairo implementations.
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void *window_, *gc_; // for keeping track internally of last win+gc treated
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};
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/** @} */
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#endif // FLTK_HAVE_CAIRO
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#endif // FL_CAIRO_H
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