1 /*
2 * Copyright (C) 2011 The Android Open Source Project
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
7 *
8 * http://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
15 */
16 #include "X11Windowing.h"
17
18 #include <stdio.h>
19 #include <stdlib.h>
20 #include <X11/Xlib.h>
21 #include <X11/Xutil.h>
22
23 #define DEBUG 0
24 #if DEBUG
25 # define D(...) printf(__VA_ARGS__), printf("\n")
26 #else
27 # define D(...) ((void)0)
28 #endif
29
30 /* Try to remember the window position between creates/destroys */
31 static int X11_wmXPos = 100;
32 static int X11_wmYPos = 100;
33
34 static int X11_wmXAdjust = 0;
35 static int X11_wmYAdjust = 0;
36
37 static void
get_window_pos(Display * disp,Window win,int * px,int * py)38 get_window_pos( Display *disp, Window win, int *px, int *py )
39 {
40 Window child;
41
42 XTranslateCoordinates( disp, win, DefaultRootWindow(disp), 0, 0, px, py, &child );
43 }
44
45
46 static void
set_window_pos(Display * disp,Window win,int x,int y)47 set_window_pos(Display *disp, Window win, int x, int y)
48 {
49 int xNew, yNew;
50 int xAdjust = X11_wmXAdjust;
51 int yAdjust = X11_wmYAdjust;
52
53 /* this code is tricky because some window managers, but not all,
54 * will translate the final window position by a given offset
55 * corresponding to the frame decoration.
56 *
57 * so we first try to move the window, get the position that the
58 * window manager has set, and if they are different, re-position the
59 * window again with an adjustment.
60 *
61 * this causes a slight flicker since the window 'jumps' very
62 * quickly from one position to the other.
63 */
64
65 D("%s: move to [%d,%d] adjusted to [%d,%d]", __FUNCTION__,
66 x, y, x+xAdjust, y+yAdjust);
67 XMoveWindow(disp, win, x + xAdjust, y + yAdjust);
68 XSync(disp, True);
69 get_window_pos(disp, win, &xNew, &yNew);
70 if (xNew != x || yNew != y) {
71 X11_wmXAdjust = xAdjust = x - xNew;
72 X11_wmYAdjust = yAdjust = y - yNew;
73 D("%s: read pos [%d,%d], recomputing adjust=[%d,%d] moving to [%d,%d]\n",
74 __FUNCTION__, xNew, yNew, xAdjust, yAdjust, x+xAdjust, y+yAdjust);
75 XMoveWindow(disp, win, x + xAdjust, y + yAdjust );
76 }
77 XSync(disp, False);
78 }
79
80
getNativeDisplay()81 NativeDisplayType X11Windowing::getNativeDisplay()
82 {
83 Display *dpy = XOpenDisplay(NULL);
84 return (NativeDisplayType)dpy;
85 }
86
createNativeWindow(NativeDisplayType _dpy,int width,int height)87 NativeWindowType X11Windowing::createNativeWindow(NativeDisplayType _dpy, int width, int height)
88 {
89 Display *dpy = (Display *) _dpy;
90
91 long defaultScreen = DefaultScreen( dpy );
92 Window rootWindow = RootWindow(dpy, defaultScreen);
93 int depth = DefaultDepth(dpy, defaultScreen);
94 XVisualInfo *visualInfo = new XVisualInfo;
95
96 XMatchVisualInfo(dpy, defaultScreen, depth, TrueColor, visualInfo);
97 if (visualInfo == NULL) {
98 fprintf(stderr, "couldn't find matching visual\n");
99 return NULL;
100 }
101
102 Colormap x11Colormap = XCreateColormap(dpy, rootWindow, visualInfo->visual, AllocNone);
103 XSetWindowAttributes sWA;
104 sWA.colormap = x11Colormap;
105 sWA.event_mask = StructureNotifyMask | ExposureMask;
106 sWA.background_pixel = 0;
107 sWA.border_pixel = 0;
108 unsigned int attributes_mask = CWBackPixel | CWBorderPixel | CWEventMask | CWColormap;
109
110 Window win = XCreateWindow( dpy,
111 rootWindow,
112 X11_wmXPos, X11_wmYPos, width, height,
113 0, CopyFromParent, InputOutput,
114 CopyFromParent, attributes_mask, &sWA);
115
116 XMapWindow(dpy, win);
117 XFlush(dpy);
118 set_window_pos(dpy, win, X11_wmXPos, X11_wmYPos);
119 return NativeWindowType(win);
120 }
121
destroyNativeWindow(NativeDisplayType _dpy,NativeWindowType _win)122 int X11Windowing::destroyNativeWindow(NativeDisplayType _dpy, NativeWindowType _win)
123 {
124 Display *dpy = (Display *)_dpy;
125 Window win = (Window)_win;
126 get_window_pos(dpy, win, &X11_wmXPos, &X11_wmYPos);
127 D("%s: Saved window position [%d, %d]\n", __FUNCTION__, X11_wmXPos, X11_wmYPos);
128 XDestroyWindow(dpy, win);
129 XFlush(dpy);
130 return 0;
131 }
132