widget/windows/nsScreenManagerWin.cpp@ac0c01689b40 (annotated)
widget/windows/nsScreenManagerWin.cpp
Thu, 15 Jan 2015 15:59:08 +0100
- author
- Michael Schloh von Bennewitz <michael@schloh.com>
- date
- Thu, 15 Jan 2015 15:59:08 +0100
- branch
- TOR_BUG_9701
- changeset 10
- ac0c01689b40
- permissions
- -rw-r--r--
Implement a real Private Browsing Mode condition by changing the API/ABI;
This solves Tor bug #9701, complying with disk avoidance documented in
https://www.torproject.org/projects/torbrowser/design/#disk-avoidance.
| michael@0 | 1 | /* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */ |
| michael@0 | 2 | /* This Source Code Form is subject to the terms of the Mozilla Public |
| michael@0 | 3 | * License, v. 2.0. If a copy of the MPL was not distributed with this |
| michael@0 | 4 | * file, You can obtain one at http://mozilla.org/MPL/2.0/. */ |
| michael@0 | 5 | |
| michael@0 | 6 | #include "nsScreenManagerWin.h" |
| michael@0 | 7 | #include "nsScreenWin.h" |
| michael@0 | 8 | #include "gfxWindowsPlatform.h" |
| michael@0 | 9 | #include "nsIWidget.h" |
| michael@0 | 10 | |
| michael@0 | 11 | |
| michael@0 | 12 | BOOL CALLBACK CountMonitors ( HMONITOR, HDC, LPRECT, LPARAM ioCount ) ; |
| michael@0 | 13 | |
| michael@0 | 14 | nsScreenManagerWin :: nsScreenManagerWin ( ) |
| michael@0 | 15 | : mNumberOfScreens(0) |
| michael@0 | 16 | { |
| michael@0 | 17 | // nothing to do. I guess we could cache a bunch of information |
| michael@0 | 18 | // here, but we want to ask the device at runtime in case anything |
| michael@0 | 19 | // has changed. |
| michael@0 | 20 | } |
| michael@0 | 21 | |
| michael@0 | 22 | |
| michael@0 | 23 | nsScreenManagerWin :: ~nsScreenManagerWin() |
| michael@0 | 24 | { |
| michael@0 | 25 | } |
| michael@0 | 26 | |
| michael@0 | 27 | |
| michael@0 | 28 | // addref, release, QI |
| michael@0 | 29 | NS_IMPL_ISUPPORTS(nsScreenManagerWin, nsIScreenManager) |
| michael@0 | 30 | |
| michael@0 | 31 | |
| michael@0 | 32 | // |
| michael@0 | 33 | // CreateNewScreenObject |
| michael@0 | 34 | // |
| michael@0 | 35 | // Utility routine. Creates a new screen object from the given device handle |
| michael@0 | 36 | // |
| michael@0 | 37 | // NOTE: For this "single-monitor" impl, we just always return the cached primary |
| michael@0 | 38 | // screen. This should change when a multi-monitor impl is done. |
| michael@0 | 39 | // |
| michael@0 | 40 | nsIScreen* |
| michael@0 | 41 | nsScreenManagerWin :: CreateNewScreenObject ( HMONITOR inScreen ) |
| michael@0 | 42 | { |
| michael@0 | 43 | nsIScreen* retScreen = nullptr; |
| michael@0 | 44 | |
| michael@0 | 45 | // look through our screen list, hoping to find it. If it's not there, |
| michael@0 | 46 | // add it and return the new one. |
| michael@0 | 47 | for ( unsigned i = 0; i < mScreenList.Length(); ++i ) { |
| michael@0 | 48 | ScreenListItem& curr = mScreenList[i]; |
| michael@0 | 49 | if ( inScreen == curr.mMon ) { |
| michael@0 | 50 | NS_IF_ADDREF(retScreen = curr.mScreen.get()); |
| michael@0 | 51 | return retScreen; |
| michael@0 | 52 | } |
| michael@0 | 53 | } // for each screen. |
| michael@0 | 54 | |
| michael@0 | 55 | retScreen = new nsScreenWin(inScreen); |
| michael@0 | 56 | mScreenList.AppendElement ( ScreenListItem ( inScreen, retScreen ) ); |
| michael@0 | 57 | |
| michael@0 | 58 | NS_IF_ADDREF(retScreen); |
| michael@0 | 59 | return retScreen; |
| michael@0 | 60 | } |
| michael@0 | 61 | |
| michael@0 | 62 | |
| michael@0 | 63 | // |
| michael@0 | 64 | // ScreenForRect |
| michael@0 | 65 | // |
| michael@0 | 66 | // Returns the screen that contains the rectangle. If the rect overlaps |
| michael@0 | 67 | // multiple screens, it picks the screen with the greatest area of intersection. |
| michael@0 | 68 | // |
| michael@0 | 69 | // The coordinates are in pixels (not twips) and in logical screen coordinates. |
| michael@0 | 70 | // |
| michael@0 | 71 | NS_IMETHODIMP |
| michael@0 | 72 | nsScreenManagerWin :: ScreenForRect ( int32_t inLeft, int32_t inTop, int32_t inWidth, int32_t inHeight, |
| michael@0 | 73 | nsIScreen **outScreen ) |
| michael@0 | 74 | { |
| michael@0 | 75 | if ( !(inWidth || inHeight) ) { |
| michael@0 | 76 | NS_WARNING ( "trying to find screen for sizeless window, using primary monitor" ); |
| michael@0 | 77 | *outScreen = CreateNewScreenObject ( nullptr ); // addrefs |
| michael@0 | 78 | return NS_OK; |
| michael@0 | 79 | } |
| michael@0 | 80 | |
| michael@0 | 81 | // convert coordinates from logical to device pixels for MonitorFromRect |
| michael@0 | 82 | double dpiScale = nsIWidget::DefaultScaleOverride(); |
| michael@0 | 83 | if (dpiScale <= 0.0) { |
| michael@0 | 84 | dpiScale = gfxWindowsPlatform::GetPlatform()->GetDPIScale(); |
| michael@0 | 85 | } |
| michael@0 | 86 | RECT globalWindowBounds = { |
| michael@0 | 87 | NSToIntRound(dpiScale * inLeft), |
| michael@0 | 88 | NSToIntRound(dpiScale * inTop), |
| michael@0 | 89 | NSToIntRound(dpiScale * (inLeft + inWidth)), |
| michael@0 | 90 | NSToIntRound(dpiScale * (inTop + inHeight)) |
| michael@0 | 91 | }; |
| michael@0 | 92 | |
| michael@0 | 93 | HMONITOR genScreen = ::MonitorFromRect( &globalWindowBounds, MONITOR_DEFAULTTOPRIMARY ); |
| michael@0 | 94 | |
| michael@0 | 95 | *outScreen = CreateNewScreenObject ( genScreen ); // addrefs |
| michael@0 | 96 | |
| michael@0 | 97 | return NS_OK; |
| michael@0 | 98 | |
| michael@0 | 99 | } // ScreenForRect |
| michael@0 | 100 | |
| michael@0 | 101 | |
| michael@0 | 102 | // |
| michael@0 | 103 | // GetPrimaryScreen |
| michael@0 | 104 | // |
| michael@0 | 105 | // The screen with the menubar/taskbar. This shouldn't be needed very |
| michael@0 | 106 | // often. |
| michael@0 | 107 | // |
| michael@0 | 108 | NS_IMETHODIMP |
| michael@0 | 109 | nsScreenManagerWin :: GetPrimaryScreen(nsIScreen** aPrimaryScreen) |
| michael@0 | 110 | { |
| michael@0 | 111 | *aPrimaryScreen = CreateNewScreenObject ( nullptr ); // addrefs |
| michael@0 | 112 | return NS_OK; |
| michael@0 | 113 | |
| michael@0 | 114 | } // GetPrimaryScreen |
| michael@0 | 115 | |
| michael@0 | 116 | |
| michael@0 | 117 | // |
| michael@0 | 118 | // CountMonitors |
| michael@0 | 119 | // |
| michael@0 | 120 | // Will be called once for every monitor in the system. Just |
| michael@0 | 121 | // increments the parameter, which holds a ptr to a PRUin32 holding the |
| michael@0 | 122 | // count up to this point. |
| michael@0 | 123 | // |
| michael@0 | 124 | BOOL CALLBACK |
| michael@0 | 125 | CountMonitors ( HMONITOR, HDC, LPRECT, LPARAM ioParam ) |
| michael@0 | 126 | { |
| michael@0 | 127 | uint32_t* countPtr = reinterpret_cast<uint32_t*>(ioParam); |
| michael@0 | 128 | ++(*countPtr); |
| michael@0 | 129 | |
| michael@0 | 130 | return TRUE; // continue the enumeration |
| michael@0 | 131 | |
| michael@0 | 132 | } // CountMonitors |
| michael@0 | 133 | |
| michael@0 | 134 | |
| michael@0 | 135 | // |
| michael@0 | 136 | // GetNumberOfScreens |
| michael@0 | 137 | // |
| michael@0 | 138 | // Returns how many physical screens are available. |
| michael@0 | 139 | // |
| michael@0 | 140 | NS_IMETHODIMP |
| michael@0 | 141 | nsScreenManagerWin :: GetNumberOfScreens(uint32_t *aNumberOfScreens) |
| michael@0 | 142 | { |
| michael@0 | 143 | if ( mNumberOfScreens ) |
| michael@0 | 144 | *aNumberOfScreens = mNumberOfScreens; |
| michael@0 | 145 | else { |
| michael@0 | 146 | uint32_t count = 0; |
| michael@0 | 147 | BOOL result = ::EnumDisplayMonitors(nullptr, nullptr, (MONITORENUMPROC)CountMonitors, (LPARAM)&count); |
| michael@0 | 148 | if (!result) |
| michael@0 | 149 | return NS_ERROR_FAILURE; |
| michael@0 | 150 | *aNumberOfScreens = mNumberOfScreens = count; |
| michael@0 | 151 | } |
| michael@0 | 152 | |
| michael@0 | 153 | return NS_OK; |
| michael@0 | 154 | |
| michael@0 | 155 | } // GetNumberOfScreens |
| michael@0 | 156 | |
| michael@0 | 157 | NS_IMETHODIMP |
| michael@0 | 158 | nsScreenManagerWin::GetSystemDefaultScale(float *aDefaultScale) |
| michael@0 | 159 | { |
| michael@0 | 160 | *aDefaultScale = float(gfxWindowsPlatform::GetPlatform()->GetDPIScale()); |
| michael@0 | 161 | return NS_OK; |
| michael@0 | 162 | } |
| michael@0 | 163 | |
| michael@0 | 164 | NS_IMETHODIMP |
| michael@0 | 165 | nsScreenManagerWin :: ScreenForNativeWidget(void *aWidget, nsIScreen **outScreen) |
| michael@0 | 166 | { |
| michael@0 | 167 | HMONITOR mon = MonitorFromWindow ((HWND) aWidget, MONITOR_DEFAULTTOPRIMARY); |
| michael@0 | 168 | *outScreen = CreateNewScreenObject (mon); |
| michael@0 | 169 | return NS_OK; |
| michael@0 | 170 | } |
