| 1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245 |
1×
1×
1×
1×
1×
1×
1×
1×
1×
1×
1×
1×
1×
1×
1×
1×
26×
26×
26×
26×
1×
8×
8×
4×
16×
4×
8×
1×
9×
9×
9×
9×
1×
13×
13×
13×
13×
52×
52×
13×
13×
1×
8×
4×
4×
4×
4×
4×
4×
4×
4×
4×
1×
2×
2×
2×
2×
2×
2×
2×
2×
2×
2×
1×
3×
3×
3×
1×
3×
1×
2×
1×
36×
36×
36×
1×
9×
9×
9×
9×
36×
36×
18×
18×
9×
| /*
* Windows Display Settings Handler
*
* Copyright 2016 Raising the Floor - US
*
* Licensed under the New BSD license. You may not use this file except in
* compliance with this License.
*
* You may obtain a copy of the License at
* https://github.com/GPII/universal/blob/master/LICENSE.txt
*/
"use strict";
var ref = require("ref");
var Struct = require("ref-struct");
var arrayType = require("ref-array");
var ffi = require("ffi");
var fluid = require("universal");
var gpii = fluid.registerNamespace("gpii");
var windows = fluid.registerNamespace("gpii.windows");
fluid.registerNamespace("gpii.windows.display");
fluid.registerNamespace("gpii.windows.displaySettingsHandler");
var t = windows.types;
var c = windows.API_constants;
var CCHDEVICENAME = 32;
var CCHFORMNAME = 32;
// https://msdn.microsoft.com/en-us/library/windows/desktop/dd183565(v=vs.85).aspx
windows.DEVMODEW = new Struct([
[arrayType(t.TCHAR, CCHDEVICENAME), "dmDeviceName"],
[t.WORD, "dmSpecVersion"],
[t.WORD, "dmDriverVersion"],
[t.WORD, "dmSize"],
[t.WORD, "dmDriverExtra"],
[t.DWORD, "dmFields"],
["short", "dmOrientation"],
["short", "dmPaperSize"],
["short", "dmPaperLength"],
["short", "dmPaperWidth"],
["short", "dmScale"],
["short", "dmCopies"],
["short", "dmDefaultSource"],
["short", "dmPrintQuality"],
["short", "dmColor"],
["short", "dmDuplex"],
["short", "dmYResolution"],
["short", "dmTTOption"],
["short", "dmCollate"],
[arrayType(t.TCHAR, CCHFORMNAME), "dmFormName"],
[t.WORD, "dmLogPixels"],
[t.DWORD, "dmBitsPerPel"],
[t.DWORD, "dmPelsWidth"],
[t.DWORD, "dmPelsHeight"],
[t.DWORD, "dmDisplayFlags"],
[t.DWORD, "dmDisplayFrequency"],
[t.DWORD, "dmICMMethod"],
[t.DWORD, "dmICMIntent"],
[t.DWORD, "dmMediaType"],
[t.DWORD, "dmDitherType"],
[t.DWORD, "dmReserved1"],
[t.DWORD, "dmReserved2"],
[t.DWORD, "dmPanningWidth"],
[t.DWORD, "dmPanningHeight"]
]);
windows.display.user32 = ffi.Library("user32", {
// https://msdn.microsoft.com/en-us/library/windows/desktop/dd162611(v=vs.85).aspx
// LPCWSTR, DWORD, DEVMODE*
"EnumDisplaySettingsW": [
t.BOOL, ["pointer", t.DWORD, "pointer"]
],
// https://msdn.microsoft.com/en-us/library/windows/desktop/dd183411(v=vs.85).aspx
// DEVMODE*, DWORD
"ChangeDisplaySettingsW": [
t.LONG, ["pointer", t.DWORD]
]
});
/*
* Creates and initializes a new DEVMODEW structure
*/
windows.display.createDevModeStruct = function () {
var dm = new windows.DEVMODEW();
dm.ref().fill(0);
dm.dmSize = windows.DEVMODEW.size;
return dm;
};
/*
* Returns if a screen resolution is invalid
*
* @param (Object)
* @returns {boolean} true if invalid
*/
windows.display.isInvalid = function (screenRes) {
var isInvalid = true;
if (typeof(screenRes.width) === "number" && typeof(screenRes.height) === "number" && screenRes.width > 0 && screenRes.height > 0) {
fluid.each(windows.display.getAvailableResolutions(), function (validScreenRes) {
if (validScreenRes.dmPelsWidth === screenRes.width && validScreenRes.dmPelsHeight === screenRes.height) {
isInvalid = false;
};
});
}
return isInvalid;
};
/*
* Gets the current display's screen resolution
*
* @return {Object) The width and height of the screen.
*/
windows.display.getScreenResolution = function () {
var dm = windows.display.createDevModeStruct();
Eif (windows.display.user32.EnumDisplaySettingsW(ref.NULL, c.ENUM_CURRENT_SETTINGS, dm.ref()) !== c.FALSE) {
// note for unknown reason on win 10 the returned dmSize is 188 not expected 220
var closestScreenRes = windows.display.findClosestResolution({width: dm.dmPelsWidth, height: dm.dmPelsHeight});
return { width: closestScreenRes.dmPelsWidth, height: closestScreenRes.dmPelsHeight };
} else {
fluid.fail("Couldn't retrieve the current screen resolution");
}
};
/*
* Gets available resolutions
*
* @return {list} of resolutions
*/
windows.display.getAvailableResolutions = function () {
var index = 0;
var dm = windows.display.createDevModeStruct();
var availableResolutions = [];
while (windows.display.user32.EnumDisplaySettingsW(ref.NULL, index++, dm.ref()) !== c.FALSE) {
var curr = {
dmPelsWidth: dm.dmPelsWidth,
dmPelsHeight: dm.dmPelsHeight
};
availableResolutions.push(curr);
};
fluid.log("windows.display.getAvailableResolutions got available screen resolutions ", availableResolutions);
return availableResolutions;
};
/*
* Sets the current display's screen resolution if possible
*
* @param {Object} The new screen resolution width and height
* @return {boolean} true if successfu
*/
windows.display.setScreenResolution = function (newRes) {
if (windows.display.isInvalid(newRes)) {
fluid.fail("Received an invalid screen resolution: ", newRes);
} else {
var dmCurrent = windows.display.createDevModeStruct();
Eif (windows.display.user32.EnumDisplaySettingsW(ref.NULL, c.ENUM_CURRENT_SETTINGS, dmCurrent.ref()) !== c.FALSE) {
fluid.log("windows.display.setScreenResolution about to set resolution ", newRes);
// Note: ChangeDisplaySettings has no effect if new is same as current
dmCurrent.dmPelsWidth = newRes.width;
dmCurrent.dmPelsHeight = newRes.height;
var lRet = windows.display.user32.ChangeDisplaySettingsW(dmCurrent.ref(), 0);
Eif (lRet === c.DISP_CHANGE_SUCCESSFUL) {
return true;
} else if (lRet === c.DISP_CHANGE_RESTART) {
// TODO: According to the returned code, the computer must be restarted for
// the graphics mode to work. For now we return 'true', but this special case
// is related to https://issues.gpii.net/browse/GPII-1982, and we must consider
// this as something that needs to be taken into account and even notified to
// the user.
//
return true;
} else {
// Return codes explained at https://msdn.microsoft.com/en-us/library/dd183411.aspx
fluid.fail("Couldn't set screen resolution, return code was " + lRet);
}
}
}
};
windows.display.setImpl = function (payload) {
var oldRes = windows.display.getScreenResolution();
var newRes = oldRes;
var targetRes = payload.settings["screen-resolution"];
Iif (typeof(targetRes.width) !== "number" || typeof(targetRes.height) !== "number") {
fluid.fail("Incorrect payload for screen resolution: " +
JSON.stringify(payload, null, 4));
}
else Eif (windows.display.setScreenResolution(targetRes)) {
newRes = targetRes;
}
var results = {};
results["screen-resolution"] = { oldValue: oldRes, newValue: newRes };
fluid.log("display settings handler SET returning results ", results);
return results;
};
windows.display.getImpl = function () {
var curRes = windows.display.getScreenResolution();
var results = { "screen-resolution": curRes };
return results;
};
windows.displaySettingsHandler.get = function (payload) {
return gpii.settingsHandlers.invokeSettingsHandler(windows.display.getImpl, payload);
};
windows.displaySettingsHandler.set = function (payload) {
return gpii.settingsHandlers.invokeSettingsHandler(windows.display.setImpl, payload);
};
// Internal utilities
// TODO: Move this into gpii.settingsHandlerUtilities and add tests
windows.display.calculateDistance = function (x, y) {
var a = x[0] - y[0];
var b = x[1] - y[1];
return Math.sqrt(a * a + b * b);
};
windows.display.findClosestResolution = function (res) {
var distance = null;
var closest = null;
var availableResolutions = windows.display.getAvailableResolutions();
fluid.each(availableResolutions, function (currRes) {
var currDist = windows.display.calculateDistance([res.width, res.height], [currRes.dmPelsWidth, currRes.dmPelsHeight]);
if (distance === null || currDist < distance) {
distance = currDist;
closest = currRes;
}
});
return closest;
};
|