1 /* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
2 /* vim: set ts=8 sts=2 et sw=2 tw=80: */
3 /* This Source Code Form is subject to the terms of the Mozilla Public
4 * License, v. 2.0. If a copy of the MPL was not distributed with this
5 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
6
7 #include "ScreenHelperWin.h"
8
9 #include "mozilla/Logging.h"
10 #include "nsTArray.h"
11 #include "WinUtils.h"
12
13 static mozilla::LazyLogModule sScreenLog("WidgetScreen");
14
15 namespace mozilla {
16 namespace widget {
17
CollectMonitors(HMONITOR aMon,HDC,LPRECT,LPARAM ioParam)18 BOOL CALLBACK CollectMonitors(HMONITOR aMon, HDC, LPRECT, LPARAM ioParam) {
19 auto screens = reinterpret_cast<nsTArray<RefPtr<Screen>>*>(ioParam);
20 BOOL success = FALSE;
21 MONITORINFOEX info;
22 info.cbSize = sizeof(MONITORINFOEX);
23 success = ::GetMonitorInfoW(aMon, &info);
24 if (!success) {
25 MOZ_LOG(sScreenLog, LogLevel::Error, ("GetMonitorInfoW failed"));
26 return TRUE; // continue the enumeration
27 }
28
29 double scale = WinUtils::LogToPhysFactor(aMon);
30 DesktopToLayoutDeviceScale contentsScaleFactor;
31 if (WinUtils::IsPerMonitorDPIAware()) {
32 contentsScaleFactor.scale = 1.0;
33 } else {
34 contentsScaleFactor.scale = scale;
35 }
36 CSSToLayoutDeviceScale defaultCssScaleFactor(scale);
37 LayoutDeviceIntRect rect(info.rcMonitor.left, info.rcMonitor.top,
38 info.rcMonitor.right - info.rcMonitor.left,
39 info.rcMonitor.bottom - info.rcMonitor.top);
40 LayoutDeviceIntRect availRect(info.rcWork.left, info.rcWork.top,
41 info.rcWork.right - info.rcWork.left,
42 info.rcWork.bottom - info.rcWork.top);
43
44 HDC hDC = CreateDC(nullptr, info.szDevice, nullptr, nullptr);
45 if (!hDC) {
46 MOZ_LOG(sScreenLog, LogLevel::Error, ("CollectMonitors CreateDC failed"));
47 return TRUE;
48 }
49 uint32_t pixelDepth = ::GetDeviceCaps(hDC, BITSPIXEL);
50 DeleteDC(hDC);
51 if (pixelDepth == 32) {
52 // If a device uses 32 bits per pixel, it's still only using 8 bits
53 // per color component, which is what our callers want to know.
54 // (Some devices report 32 and some devices report 24.)
55 pixelDepth = 24;
56 }
57
58 float dpi = WinUtils::MonitorDPI(aMon);
59 MOZ_LOG(sScreenLog, LogLevel::Debug,
60 ("New screen [%d %d %d %d (%d %d %d %d) %d %f %f %f]", rect.X(),
61 rect.Y(), rect.Width(), rect.Height(), availRect.X(), availRect.Y(),
62 availRect.Width(), availRect.Height(), pixelDepth,
63 contentsScaleFactor.scale, defaultCssScaleFactor.scale, dpi));
64 auto screen = new Screen(rect, availRect, pixelDepth, pixelDepth,
65 contentsScaleFactor, defaultCssScaleFactor, dpi);
66 if (info.dwFlags & MONITORINFOF_PRIMARY) {
67 // The primary monitor must be the first element of the screen list.
68 screens->InsertElementAt(0, Move(screen));
69 } else {
70 screens->AppendElement(Move(screen));
71 }
72 return TRUE;
73 }
74
RefreshScreens()75 void ScreenHelperWin::RefreshScreens() {
76 MOZ_LOG(sScreenLog, LogLevel::Debug, ("Refreshing screens"));
77
78 AutoTArray<RefPtr<Screen>, 4> screens;
79 BOOL result = ::EnumDisplayMonitors(
80 nullptr, nullptr, (MONITORENUMPROC)CollectMonitors, (LPARAM)&screens);
81 if (!result) {
82 NS_WARNING("Unable to EnumDisplayMonitors");
83 }
84 ScreenManager& screenManager = ScreenManager::GetSingleton();
85 screenManager.Refresh(Move(screens));
86 }
87
88 } // namespace widget
89 } // namespace mozilla
90