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X11_Window.C
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C/C++ Source or Header
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1993-03-09
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159 lines
/*
* X11_Window.C - X11 window driver.
*
* Copyright (C) 1992, Christoph Streit (streit@iam.unibe.ch)
* University of Berne, Switzerland
* All rights reserved.
*
* This software may be freely copied, modified, and redistributed
* provided that this copyright notice is preserved on all copies.
*
* You may not distribute this software, in whole or in part, as part of
* any commercial product without the express consent of the authors.
*
* There is no warranty or other guarantee of fitness of this software
* for any purpose. It is provided solely "as is".
*
*/
#include "X11_Window.h"
#include "Error.h"
#include "X11_Window_icon"
//___________________________________________________________ X11_Window
X11_Window::X11_Window()
: display_name(NULL), segments(NULL), RequestSize(10), segmentsInBuffer(0)
{}
void X11_Window::open(int width, int height, const rcString& windowName)
{
BaseWindow::open(width, height, windowName);
if ((display = XOpenDisplay(display_name)) == NULL)
Error(ERR_PANIC, rcString("cannot connect to X server ")
+ XDisplayName(display_name));
/*
* Buffering of XSegments is done to achieve better preformance.
* Check maximal request size of display server.
*/
RequestSize = (XMaxRequestSize(display) < 10000)
? XMaxRequestSize(display) : 10000;
segments = new XSegment[RequestSize];
int screen = DefaultScreen(display);
win = XCreateSimpleWindow(display, RootWindow(display, screen),
0, 0, resX, resY, 1,
BlackPixel(display, screen),
WhitePixel(display, screen));
Pixmap iconPixmap = XCreateBitmapFromData(display, win,
X11_Window_icon_bits,
X11_Window_icon_width,
X11_Window_icon_height);
gc = XCreateGC(display, win, 0, NULL);
XSetForeground(display, gc, BlackPixel(display, screen));
XSizeHints hints;
hints.flags = PSize | PMinSize | PMaxSize;
hints.width = resX; hints.height = resY;
hints.min_width = resX; hints.min_height = resY;
hints.max_width = resX; hints.max_height = resY;
XSetStandardProperties(display, win,
(char*) windowName.chars(), (char*) windowName.chars(),
iconPixmap, 0, 0, &hints);
XSelectInput(display, win, ExposureMask | KeyPressMask);
XMapWindow(display, win);
/*
* Wait for window to come up.
*/
XEvent report;
while(1) {
XNextEvent(display, &report);
if (report.type == Expose)
if (report.xexpose.count == 0)
break;
}
XSetWindowAttributes attributes;
attributes.backing_store = Always;
XChangeWindowAttributes(display, win, CWBackingStore, &attributes);
}
void X11_Window::close()
{
BaseWindow::close();
XFreeGC(display, gc);
XCloseDisplay(display);
delete [] segments;
}
void X11_Window::clear()
{
BaseWindow::clear();
XClearWindow(display, win);
}
char X11_Window::waitForKey()
{
XEvent event;
const int bufsize = 20;
char buffer[bufsize];
KeySym keysym;
XComposeStatus stat;
while(1) {
XNextEvent(display, &event);
if (event.type == KeyPress &&
XLookupString(&event.xkey, buffer, bufsize, &keysym, &stat) == 1)
return buffer[0];
}
}
void X11_Window::writeText(const rcString& msg, int x, int y)
{
XDrawString(display, win, gc, x, y, msg.chars(), msg.length());
XFlush(display);
}
/*
* Buffer line segments. If we have request size XSegments,
* bring the hole buffer to screen.
*/
void X11_Window::drawLine(int x1, int y1, int x2, int y2)
{
if (segmentsInBuffer < RequestSize) {
segments[segmentsInBuffer].x1 = x1;
segments[segmentsInBuffer].y1 = resY-y1;
segments[segmentsInBuffer].x2 = x2;
segments[segmentsInBuffer].y2 = resY-y2;
segmentsInBuffer++;
}
else {
XDrawSegments(display, win, gc, segments, segmentsInBuffer);
segmentsInBuffer = 0;
}
}
/*
* Flush segment buffer.
*/
void X11_Window::flush()
{
BaseWindow::flush();
if (segmentsInBuffer > 0) {
XDrawSegments(display, win, gc, segments, segmentsInBuffer);
segmentsInBuffer = 0;
}
XFlush(display);
}