michael@0: /* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
michael@0: /* This Source Code Form is subject to the terms of the Mozilla Public
michael@0:  * License, v. 2.0. If a copy of the MPL was not distributed with this
michael@0:  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
michael@0: 
michael@0: #include "nsScreenManagerWin.h"
michael@0: #include "nsScreenWin.h"
michael@0: #include "gfxWindowsPlatform.h"
michael@0: #include "nsIWidget.h"
michael@0: 
michael@0: 
michael@0: BOOL CALLBACK CountMonitors ( HMONITOR, HDC, LPRECT, LPARAM ioCount ) ;
michael@0: 
michael@0: nsScreenManagerWin :: nsScreenManagerWin ( )
michael@0:   : mNumberOfScreens(0)
michael@0: {
michael@0:   // nothing to do. I guess we could cache a bunch of information
michael@0:   // here, but we want to ask the device at runtime in case anything
michael@0:   // has changed.
michael@0: }
michael@0: 
michael@0: 
michael@0: nsScreenManagerWin :: ~nsScreenManagerWin()
michael@0: {
michael@0: }
michael@0: 
michael@0: 
michael@0: // addref, release, QI
michael@0: NS_IMPL_ISUPPORTS(nsScreenManagerWin, nsIScreenManager)
michael@0: 
michael@0: 
michael@0: //
michael@0: // CreateNewScreenObject
michael@0: //
michael@0: // Utility routine. Creates a new screen object from the given device handle
michael@0: //
michael@0: // NOTE: For this "single-monitor" impl, we just always return the cached primary
michael@0: //        screen. This should change when a multi-monitor impl is done.
michael@0: //
michael@0: nsIScreen* 
michael@0: nsScreenManagerWin :: CreateNewScreenObject ( HMONITOR inScreen )
michael@0: {
michael@0:   nsIScreen* retScreen = nullptr;
michael@0:   
michael@0:   // look through our screen list, hoping to find it. If it's not there,
michael@0:   // add it and return the new one.
michael@0:   for ( unsigned i = 0; i < mScreenList.Length(); ++i ) {
michael@0:     ScreenListItem& curr = mScreenList[i];
michael@0:     if ( inScreen == curr.mMon ) {
michael@0:       NS_IF_ADDREF(retScreen = curr.mScreen.get());
michael@0:       return retScreen;
michael@0:     }
michael@0:   } // for each screen.
michael@0:  
michael@0:   retScreen = new nsScreenWin(inScreen);
michael@0:   mScreenList.AppendElement ( ScreenListItem ( inScreen, retScreen ) );
michael@0: 
michael@0:   NS_IF_ADDREF(retScreen);
michael@0:   return retScreen;
michael@0: }
michael@0: 
michael@0: 
michael@0: //
michael@0: // ScreenForRect 
michael@0: //
michael@0: // Returns the screen that contains the rectangle. If the rect overlaps
michael@0: // multiple screens, it picks the screen with the greatest area of intersection.
michael@0: //
michael@0: // The coordinates are in pixels (not twips) and in logical screen coordinates.
michael@0: //
michael@0: NS_IMETHODIMP
michael@0: nsScreenManagerWin :: ScreenForRect ( int32_t inLeft, int32_t inTop, int32_t inWidth, int32_t inHeight,
michael@0:                                         nsIScreen **outScreen )
michael@0: {
michael@0:   if ( !(inWidth || inHeight) ) {
michael@0:     NS_WARNING ( "trying to find screen for sizeless window, using primary monitor" );
michael@0:     *outScreen = CreateNewScreenObject ( nullptr );    // addrefs
michael@0:     return NS_OK;
michael@0:   }
michael@0: 
michael@0:   // convert coordinates from logical to device pixels for MonitorFromRect
michael@0:   double dpiScale = nsIWidget::DefaultScaleOverride();
michael@0:   if (dpiScale <= 0.0) {
michael@0:     dpiScale = gfxWindowsPlatform::GetPlatform()->GetDPIScale(); 
michael@0:   }
michael@0:   RECT globalWindowBounds = {
michael@0:     NSToIntRound(dpiScale * inLeft),
michael@0:     NSToIntRound(dpiScale * inTop),
michael@0:     NSToIntRound(dpiScale * (inLeft + inWidth)),
michael@0:     NSToIntRound(dpiScale * (inTop + inHeight))
michael@0:   };
michael@0: 
michael@0:   HMONITOR genScreen = ::MonitorFromRect( &globalWindowBounds, MONITOR_DEFAULTTOPRIMARY );
michael@0: 
michael@0:   *outScreen = CreateNewScreenObject ( genScreen );    // addrefs
michael@0:   
michael@0:   return NS_OK;
michael@0:     
michael@0: } // ScreenForRect
michael@0: 
michael@0: 
michael@0: //
michael@0: // GetPrimaryScreen
michael@0: //
michael@0: // The screen with the menubar/taskbar. This shouldn't be needed very
michael@0: // often.
michael@0: //
michael@0: NS_IMETHODIMP 
michael@0: nsScreenManagerWin :: GetPrimaryScreen(nsIScreen** aPrimaryScreen) 
michael@0: {
michael@0:   *aPrimaryScreen = CreateNewScreenObject ( nullptr );    // addrefs  
michael@0:   return NS_OK;
michael@0:   
michael@0: } // GetPrimaryScreen
michael@0: 
michael@0: 
michael@0: //
michael@0: // CountMonitors
michael@0: //
michael@0: // Will be called once for every monitor in the system. Just 
michael@0: // increments the parameter, which holds a ptr to a PRUin32 holding the
michael@0: // count up to this point.
michael@0: //
michael@0: BOOL CALLBACK
michael@0: CountMonitors ( HMONITOR, HDC, LPRECT, LPARAM ioParam )
michael@0: {
michael@0:   uint32_t* countPtr = reinterpret_cast<uint32_t*>(ioParam);
michael@0:   ++(*countPtr);
michael@0: 
michael@0:   return TRUE; // continue the enumeration
michael@0: 
michael@0: } // CountMonitors
michael@0: 
michael@0: 
michael@0: //
michael@0: // GetNumberOfScreens
michael@0: //
michael@0: // Returns how many physical screens are available.
michael@0: //
michael@0: NS_IMETHODIMP
michael@0: nsScreenManagerWin :: GetNumberOfScreens(uint32_t *aNumberOfScreens)
michael@0: {
michael@0:   if ( mNumberOfScreens )
michael@0:     *aNumberOfScreens = mNumberOfScreens;
michael@0:   else {
michael@0:     uint32_t count = 0;
michael@0:     BOOL result = ::EnumDisplayMonitors(nullptr, nullptr, (MONITORENUMPROC)CountMonitors, (LPARAM)&count);
michael@0:     if (!result)
michael@0:       return NS_ERROR_FAILURE;
michael@0:     *aNumberOfScreens = mNumberOfScreens = count;
michael@0:   }
michael@0: 
michael@0:   return NS_OK;
michael@0:   
michael@0: } // GetNumberOfScreens
michael@0: 
michael@0: NS_IMETHODIMP
michael@0: nsScreenManagerWin::GetSystemDefaultScale(float *aDefaultScale)
michael@0: {
michael@0:   *aDefaultScale = float(gfxWindowsPlatform::GetPlatform()->GetDPIScale());
michael@0:   return NS_OK;
michael@0: }
michael@0: 
michael@0: NS_IMETHODIMP
michael@0: nsScreenManagerWin :: ScreenForNativeWidget(void *aWidget, nsIScreen **outScreen)
michael@0: {
michael@0:   HMONITOR mon = MonitorFromWindow ((HWND) aWidget, MONITOR_DEFAULTTOPRIMARY);
michael@0:   *outScreen = CreateNewScreenObject (mon);
michael@0:   return NS_OK;
michael@0: }