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/*
* Copyright (C) 2011 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#include "X11Windowing.h"
#include <stdio.h>
#include <stdlib.h>
#include <X11/Xlib.h>
#include <X11/Xutil.h>
#define DEBUG 0
#if DEBUG
# define D(...) printf(__VA_ARGS__), printf("\n")
#else
# define D(...) ((void)0)
#endif
/* Try to remember the window position between creates/destroys */
static int X11_wmXPos = 100;
static int X11_wmYPos = 100;
static int X11_wmXAdjust = 0;
static int X11_wmYAdjust = 0;
static void
get_window_pos( Display *disp, Window win, int *px, int *py )
{
Window child;
XTranslateCoordinates( disp, win, DefaultRootWindow(disp), 0, 0, px, py, &child );
}
static void
set_window_pos(Display *disp, Window win, int x, int y)
{
int xNew, yNew;
int xAdjust = X11_wmXAdjust;
int yAdjust = X11_wmYAdjust;
/* this code is tricky because some window managers, but not all,
* will translate the final window position by a given offset
* corresponding to the frame decoration.
*
* so we first try to move the window, get the position that the
* window manager has set, and if they are different, re-position the
* window again with an adjustment.
*
* this causes a slight flicker since the window 'jumps' very
* quickly from one position to the other.
*/
D("%s: move to [%d,%d] adjusted to [%d,%d]", __FUNCTION__,
x, y, x+xAdjust, y+yAdjust);
XMoveWindow(disp, win, x + xAdjust, y + yAdjust);
XSync(disp, True);
get_window_pos(disp, win, &xNew, &yNew);
if (xNew != x || yNew != y) {
X11_wmXAdjust = xAdjust = x - xNew;
X11_wmYAdjust = yAdjust = y - yNew;
D("%s: read pos [%d,%d], recomputing adjust=[%d,%d] moving to [%d,%d]\n",
__FUNCTION__, xNew, yNew, xAdjust, yAdjust, x+xAdjust, y+yAdjust);
XMoveWindow(disp, win, x + xAdjust, y + yAdjust );
}
XSync(disp, False);
}
NativeDisplayType X11Windowing::getNativeDisplay()
{
Display *dpy = XOpenDisplay(NULL);
return (NativeDisplayType)dpy;
}
NativeWindowType X11Windowing::createNativeWindow(NativeDisplayType _dpy, int width, int height)
{
Display *dpy = (Display *) _dpy;
long defaultScreen = DefaultScreen( dpy );
Window rootWindow = RootWindow(dpy, defaultScreen);
int depth = DefaultDepth(dpy, defaultScreen);
XVisualInfo *visualInfo = new XVisualInfo;
XMatchVisualInfo(dpy, defaultScreen, depth, TrueColor, visualInfo);
if (visualInfo == NULL) {
fprintf(stderr, "couldn't find matching visual\n");
return NULL;
}
Colormap x11Colormap = XCreateColormap(dpy, rootWindow, visualInfo->visual, AllocNone);
XSetWindowAttributes sWA;
sWA.colormap = x11Colormap;
sWA.event_mask = StructureNotifyMask | ExposureMask;
sWA.background_pixel = 0;
sWA.border_pixel = 0;
unsigned int attributes_mask = CWBackPixel | CWBorderPixel | CWEventMask | CWColormap;
Window win = XCreateWindow( dpy,
rootWindow,
X11_wmXPos, X11_wmYPos, width, height,
0, CopyFromParent, InputOutput,
CopyFromParent, attributes_mask, &sWA);
XMapWindow(dpy, win);
XFlush(dpy);
set_window_pos(dpy, win, X11_wmXPos, X11_wmYPos);
return NativeWindowType(win);
}
int X11Windowing::destroyNativeWindow(NativeDisplayType _dpy, NativeWindowType _win)
{
Display *dpy = (Display *)_dpy;
Window win = (Window)_win;
get_window_pos(dpy, win, &X11_wmXPos, &X11_wmYPos);
D("%s: Saved window position [%d, %d]\n", __FUNCTION__, X11_wmXPos, X11_wmYPos);
XDestroyWindow(dpy, win);
XFlush(dpy);
return 0;
}
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