gecko-dev/widget/windows/nsScreenWin.cpp

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/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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#include "nsScreenWin.h"
#include "nsCoord.h"
#include "gfxWindowsPlatform.h"
#include "nsIWidget.h"
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nsScreenWin :: nsScreenWin ( HMONITOR inScreen )
: mScreen(inScreen)
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{
#ifdef DEBUG
HDC hDCScreen = ::GetDC(nullptr);
NS_ASSERTION(hDCScreen,"GetDC Failure");
NS_ASSERTION ( ::GetDeviceCaps(hDCScreen, TECHNOLOGY) == DT_RASDISPLAY, "Not a display screen");
::ReleaseDC(nullptr,hDCScreen);
#endif
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// nothing else to do. I guess we could cache a bunch of information
// here, but we want to ask the device at runtime in case anything
// has changed.
}
nsScreenWin :: ~nsScreenWin()
{
// nothing to see here.
}
NS_IMETHODIMP
nsScreenWin :: GetRect(int32_t *outLeft, int32_t *outTop, int32_t *outWidth, int32_t *outHeight)
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{
BOOL success = FALSE;
if ( mScreen ) {
MONITORINFO info;
info.cbSize = sizeof(MONITORINFO);
success = ::GetMonitorInfoW( mScreen, &info );
if ( success ) {
*outLeft = info.rcMonitor.left;
*outTop = info.rcMonitor.top;
*outWidth = info.rcMonitor.right - info.rcMonitor.left;
*outHeight = info.rcMonitor.bottom - info.rcMonitor.top;
}
}
if (!success) {
HDC hDCScreen = ::GetDC(nullptr);
NS_ASSERTION(hDCScreen,"GetDC Failure");
*outTop = *outLeft = 0;
*outWidth = ::GetDeviceCaps(hDCScreen, HORZRES);
*outHeight = ::GetDeviceCaps(hDCScreen, VERTRES);
::ReleaseDC(nullptr, hDCScreen);
}
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return NS_OK;
} // GetRect
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NS_IMETHODIMP
nsScreenWin :: GetAvailRect(int32_t *outLeft, int32_t *outTop, int32_t *outWidth, int32_t *outHeight)
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{
BOOL success = FALSE;
if ( mScreen ) {
MONITORINFO info;
info.cbSize = sizeof(MONITORINFO);
success = ::GetMonitorInfoW( mScreen, &info );
if ( success ) {
*outLeft = info.rcWork.left;
*outTop = info.rcWork.top;
*outWidth = info.rcWork.right - info.rcWork.left;
*outHeight = info.rcWork.bottom - info.rcWork.top;
}
}
if (!success) {
RECT workArea;
::SystemParametersInfo(SPI_GETWORKAREA, 0, &workArea, 0);
*outLeft = workArea.left;
*outTop = workArea.top;
*outWidth = workArea.right - workArea.left;
*outHeight = workArea.bottom - workArea.top;
}
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return NS_OK;
} // GetAvailRect
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static double
GetDPIScale()
{
double dpiScale= nsIWidget::DefaultScaleOverride();
if (dpiScale <= 0.0) {
dpiScale = gfxWindowsPlatform::GetPlatform()->GetDPIScale();
}
return dpiScale;
}
NS_IMETHODIMP
nsScreenWin::GetRectDisplayPix(int32_t *outLeft, int32_t *outTop,
int32_t *outWidth, int32_t *outHeight)
{
int32_t left, top, width, height;
nsresult rv = GetRect(&left, &top, &width, &height);
if (NS_FAILED(rv)) {
return rv;
}
double scaleFactor = 1.0 / GetDPIScale();
*outLeft = NSToIntRound(left * scaleFactor);
*outTop = NSToIntRound(top * scaleFactor);
*outWidth = NSToIntRound(width * scaleFactor);
*outHeight = NSToIntRound(height * scaleFactor);
return NS_OK;
}
NS_IMETHODIMP
nsScreenWin::GetAvailRectDisplayPix(int32_t *outLeft, int32_t *outTop,
int32_t *outWidth, int32_t *outHeight)
{
int32_t left, top, width, height;
nsresult rv = GetAvailRect(&left, &top, &width, &height);
if (NS_FAILED(rv)) {
return rv;
}
double scaleFactor = 1.0 / GetDPIScale();
*outLeft = NSToIntRound(left * scaleFactor);
*outTop = NSToIntRound(top * scaleFactor);
*outWidth = NSToIntRound(width * scaleFactor);
*outHeight = NSToIntRound(height * scaleFactor);
return NS_OK;
}
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NS_IMETHODIMP
nsScreenWin :: GetPixelDepth(int32_t *aPixelDepth)
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{
//XXX not sure how to get this info for multiple monitors, this might be ok...
HDC hDCScreen = ::GetDC(nullptr);
NS_ASSERTION(hDCScreen,"GetDC Failure");
int32_t depth = ::GetDeviceCaps(hDCScreen, BITSPIXEL);
if (depth == 32) {
// If a device uses 32 bits per pixel, it's still only using 8 bits
// per color component, which is what our callers want to know.
// (Some devices report 32 and some devices report 24.)
depth = 24;
}
*aPixelDepth = depth;
::ReleaseDC(nullptr, hDCScreen);
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return NS_OK;
} // GetPixelDepth
NS_IMETHODIMP
nsScreenWin :: GetColorDepth(int32_t *aColorDepth)
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{
return GetPixelDepth(aColorDepth);
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} // GetColorDepth