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//
// "$Id$"
//
// Overlay support for the Fast Light Tool Kit (FLTK).
//
// Copyright 1998-2017 by Bill Spitzak and others.
//
// This library is free software. Distribution and use rights are outlined in
// the file "COPYING" which should have been included with this file. If this
// file is missing or damaged, see the license at:
//
// http://www.fltk.org/COPYING.php
//
// 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>
//#define USE_XOR
// unless USE_XOR is defined, this source file is cross-platform
#ifdef USE_XOR
#include <config.h>
#endif
static int px,py,pw,ph;
#ifndef USE_XOR
#include <stdlib.h>
static uchar *bgN = 0L, *bgS = 0L, *bgE = 0L, *bgW = 0L;
#include <FL/Fl_Screen_Driver.H>
#include <FL/Fl_RGB_Image.H>
#include <FL/Fl_Shared_Image.H>
static Fl_Shared_Image *s_bgN = 0, *s_bgS = 0, *s_bgE = 0, *s_bgW = 0;
static int bgx, bgy, bgw, bgh;
#endif
static void draw_current_rect() {
#ifdef USE_XOR
# if defined(USE_X11)
GC gc = (GC)fl_graphics_driver->gc();
XSetFunction(fl_display, gc, GXxor);
XSetForeground(fl_display, gc, 0xffffffff);
XDrawRectangle(fl_display, fl_window, gc, px, py, pw, ph);
XSetFunction(fl_display, gc, GXcopy);
# elif defined(WIN32)
int old = SetROP2(fl_graphics_driver->gc(), R2_NOT);
fl_rect(px, py, pw, ph);
SetROP2(fl_graphics_driver->gc(), old);
# elif defined(__APPLE_) // PORTME: Fl_Window_Driver - platform overlay
// warning: Quartz does not support xor drawing
// Use the Fl_Overlay_Window instead.
fl_color(FL_WHITE);
fl_rect(px, py, pw, ph);
# else
# error unsupported platform
# endif
#else
float s = fl_graphics_driver->scale();
if (s == int(s)) {
if (bgN) { free(bgN); bgN = 0L; }
if (bgS) { free(bgS); bgS = 0L; }
if (bgE) { free(bgE); bgE = 0L; }
if (bgW) { free(bgW); bgW = 0L; }
} else {
if (s_bgN) { s_bgN->release(); s_bgN = 0; }
if (s_bgS) { s_bgS->release(); s_bgS = 0; }
if (s_bgE) { s_bgE->release(); s_bgE = 0; }
if (s_bgW) { s_bgW->release(); s_bgW = 0; }
}
if (pw>0 && ph>0) {
if (s == int(s)) {
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);
} else {
Fl_RGB_Image *tmp;
tmp = Fl::screen_driver()->read_win_rectangle(NULL, px+pw-1, py, 1, ph, 0);
if(tmp && tmp->w() && tmp->h()) {
s_bgE = Fl_Shared_Image::get(tmp);
s_bgE->scale(1, ph,0,1);
}
tmp = Fl::screen_driver()->read_win_rectangle(NULL, px, py, 1, ph, 0);
if(tmp && tmp->w() && tmp->h()) {
s_bgW = Fl_Shared_Image::get(tmp);
s_bgW->scale(1, ph,0,1);
}
tmp = Fl::screen_driver()->read_win_rectangle(NULL, px, py+ph-1, pw, 1, 0);
if(tmp && tmp->w() && tmp->h()) {
s_bgS = Fl_Shared_Image::get(tmp);
s_bgS->scale(pw, 1,0,1);
}
tmp = Fl::screen_driver()->read_win_rectangle(NULL, px, py, pw, 1, 0);
if(tmp && tmp->w() && tmp->h()) {
s_bgN = Fl_Shared_Image::get(tmp);
s_bgN->scale(pw, 1,0,1);
}
}
bgx = px; bgy = py;
bgw = pw; bgh = ph;
}
fl_color(FL_WHITE);
fl_line_style(FL_SOLID);
if (s == int(s)) fl_rect(px, py, pw, ph);
else fl_loop(px, py, px+pw-1, py, px+pw-1, py+ph-1, px, py+ph-1);
fl_color(FL_BLACK);
fl_line_style(FL_DOT);
if (s == int(s)) fl_rect(px, py, pw, ph);
else fl_loop(px, py, px+pw-1, py, px+pw-1, py+ph-1, px, py+ph-1);
fl_line_style(FL_SOLID);
#endif // USE_XOR
}
static void erase_current_rect() {
#ifdef USE_XOR
# ifdef __APPLE_QUARTZ__ // PORTME: Fl_Window_Driver - platform overlay
fl_rect(px, py, pw, ph);
# else
draw_current_rect();
# endif
#else
float s = fl_graphics_driver->scale();
if (s == int(s)) {
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);
} else {
if (s_bgN) s_bgN->draw(bgx, bgy);
if (s_bgS) s_bgS->draw(bgx, (bgy+bgh-1));
if (s_bgW) s_bgW->draw(bgx, bgy);
if (s_bgE) s_bgE->draw((bgx+bgw-1), bgy);
}
#endif
}
/**
Erase a selection rectangle without drawing a new one
*/
void fl_overlay_clear() {
if (pw > 0) {erase_current_rect(); pw = 0;}
}
/**
Draws a selection rectangle, erasing a previous one by XOR'ing it first.
*/
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 "$Id$".
//
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