8ba982ae37
This commit adds a cairo_surface flush after calling the draw callback. This fixes the test/cairo_test demo program under Windows. At least under Windows the Cairo callback used in Fl_Cairo_Window didn't draw anything with current Windows 10, MinGW (32-bit) and Cairo 1.15.12 for Windows. It worked well under Linux though. Anyway, the flush should do no harm.
94 lines
2.7 KiB
C++
94 lines
2.7 KiB
C++
//
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// "$Id$"
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//
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// Main header file for the Fast Light Tool Kit (FLTK).
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//
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// Copyright 1998-2018 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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// http://www.fltk.org/COPYING.php
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//
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// Please report all bugs and problems on the following page:
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//
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// http://www.fltk.org/str.php
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//
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/* \file
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Fl_Cairo_Window Handling transparently a FLTK window incorporating a cairo draw callback.
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*/
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#ifndef FL_CAIRO_WINDOW_H
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# define FL_CAIRO_WINDOW_H
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# ifdef FLTK_HAVE_CAIRO
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// Cairo is currently supported for the following platforms:
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// Win32, Apple Quartz, X11
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# include <FL/Fl.H>
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# include <FL/Fl_Double_Window.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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This defines a FLTK window with cairo support.
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This class overloads the virtual draw() method for you,
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so that the only thing you have to do is to provide your cairo code.
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All cairo context handling is achieved transparently.
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\note You can alternatively define your custom cairo FLTK window,
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and thus at least override the draw() method to provide custom cairo
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support. In this case you will probably use Fl::cairo_make_current(Fl_Window*)
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to attach a context to your window. You should do it only when your window is
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the current window. \see Fl_Window::current()
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*/
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class FL_EXPORT Fl_Cairo_Window : public Fl_Double_Window {
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public:
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Fl_Cairo_Window(int W, int H, const char *L = 0)
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: Fl_Double_Window(W, H, L), draw_cb_(0) {}
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Fl_Cairo_Window(int X, int Y, int W, int H, const char *L = 0)
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: Fl_Double_Window(X, Y, W, H, L), draw_cb_(0) {}
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protected:
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/** Overloaded to provide cairo callback support */
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void draw() {
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Fl_Double_Window::draw();
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if (draw_cb_) { // call the Cairo draw callback
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// manual method ? if yes explicitly get a cairo_context here
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if (!Fl::cairo_autolink_context())
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Fl::cairo_make_current(this);
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draw_cb_(this, Fl::cairo_cc());
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// flush cairo drawings: necessary at least for Windows
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cairo_surface_t *s = cairo_get_target(Fl::cairo_cc());
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cairo_surface_flush(s);
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}
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}
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public:
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/** This defines the cairo draw callback prototype that you must further */
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typedef void (*cairo_draw_cb) (Fl_Cairo_Window* self, cairo_t* def);
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/**
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You must provide a draw callback which will implement your cairo rendering.
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This method will permit you to set your cairo callback to \p cb.
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*/
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void set_draw_cb(cairo_draw_cb cb) { draw_cb_ = cb; }
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private:
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cairo_draw_cb draw_cb_;
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};
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/** @} */
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# endif // FLTK_HAVE_CAIRO
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#endif // FL_CAIRO_WINDOW_H
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//
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// End of "$Id$" .
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//
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