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//
// "$Id: fl_overlay.cxx 5614 2007-01-18 15:25:09Z matt $"
//
// Overlay support for the Fast Light Tool Kit (FLTK).
//
// Copyright 1998-2005 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
//
// Extremely limited "overlay" support. You can use this to drag out
// a rectangle in response to mouse events. It is your responsibility
// to erase the overlay before drawing anything that might intersect
// it.
#include <FL/x.H>
#include <FL/fl_draw.H>
#ifdef __APPLE__
#include <config.h>
#endif
//#define USE_XOR
static int px,py,pw,ph;
#ifndef USE_XOR
#include <stdlib.h>
static uchar *bgN = 0L, *bgS = 0L, *bgE = 0L, *bgW = 0L;
static int bgx, bgy, bgw, bgh;
#endif
static void draw_current_rect() {
#ifdef USE_XOR
# ifdef WIN32
int old = SetROP2(fl_gc, R2_NOT);
fl_rect(px, py, pw, ph);
SetROP2(fl_gc, old);
# elif defined(__APPLE_QD__)
PenMode( patXor );
fl_rect(px, py, pw, ph);
PenMode( patCopy );
# elif defined(__APPLE_QUARTZ__)
// warning: Quartz does not support xor drawing
// Use the Fl_Overlay_Window instead.
fl_color(FL_WHITE);
fl_rect(px, py, pw, ph);
# else
XSetFunction(fl_display, fl_gc, GXxor);
XSetForeground(fl_display, fl_gc, 0xffffffff);
XDrawRectangle(fl_display, fl_window, fl_gc, px, py, pw, ph);
XSetFunction(fl_display, fl_gc, GXcopy);
# endif
#else
if (bgN) { free(bgN); bgN = 0L; }
if (bgS) { free(bgS); bgS = 0L; }
if (bgE) { free(bgE); bgE = 0L; }
if (bgW) { free(bgW); bgW = 0L; }
if (pw>0 && ph>0) {
bgE = fl_read_image(0L, px+pw-1, py, 1, ph);
bgW = fl_read_image(0L, px, py, 1, ph);
bgS = fl_read_image(0L, px, py+ph-1, pw, 1);
bgN = fl_read_image(0L, px, py, pw, 1);
bgx = px; bgy = py;
bgw = pw; bgh = ph;
}
fl_color(FL_WHITE);
fl_line_style(FL_SOLID);
fl_rect(px, py, pw, ph);
fl_color(FL_BLACK);
fl_line_style(FL_DOT);
fl_rect(px, py, pw, ph);
fl_line_style(FL_SOLID);
#endif
}
static void erase_current_rect() {
#ifdef USE_XOR
# ifdef __APPLE_QUARTZ__
fl_rect(px, py, pw, ph);
# else
draw_current_rect();
# endif
#else
if (bgN) fl_draw_image(bgN, bgx, bgy, bgw, 1);
if (bgS) fl_draw_image(bgS, bgx, bgy+bgh-1, bgw, 1);
if (bgW) fl_draw_image(bgW, bgx, bgy, 1, bgh);
if (bgE) fl_draw_image(bgE, bgx+bgw-1, bgy, 1, bgh);
#endif
}
void fl_overlay_clear() {
if (pw > 0) {erase_current_rect(); pw = 0;}
}
void fl_overlay_rect(int x, int y, int w, int h) {
if (w < 0) {x += w; w = -w;} else if (!w) w = 1;
if (h < 0) {y += h; h = -h;} else if (!h) h = 1;
if (pw > 0) {
if (x==px && y==py && w==pw && h==ph) return;
erase_current_rect();
}
px = x; py = y; pw = w; ph = h;
draw_current_rect();
}
//
// End of "$Id: fl_overlay.cxx 5614 2007-01-18 15:25:09Z matt $".
//
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