gecko/dom/base/nsScreen.cpp

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/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* ***** BEGIN LICENSE BLOCK *****
* Version: MPL 1.1/GPL 2.0/LGPL 2.1
*
* The contents of this file are subject to the Mozilla Public License Version
* 1.1 (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
* http://www.mozilla.org/MPL/
*
* Software distributed under the License is distributed on an "AS IS" basis,
* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
* for the specific language governing rights and limitations under the
* License.
*
* The Original Code is mozilla.org code.
*
* The Initial Developer of the Original Code is
* Netscape Communications Corporation.
* Portions created by the Initial Developer are Copyright (C) 1998
* the Initial Developer. All Rights Reserved.
*
* Contributor(s):
* Travis Bogard <travis@netscape.com>
*
* Alternatively, the contents of this file may be used under the terms of
* either of the GNU General Public License Version 2 or later (the "GPL"),
* or the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
* in which case the provisions of the GPL or the LGPL are applicable instead
* of those above. If you wish to allow use of your version of this file only
* under the terms of either the GPL or the LGPL, and not to allow others to
* use your version of this file under the terms of the MPL, indicate your
* decision by deleting the provisions above and replace them with the notice
* and other provisions required by the GPL or the LGPL. If you do not delete
* the provisions above, a recipient may use your version of this file under
* the terms of any one of the MPL, the GPL or the LGPL.
*
* ***** END LICENSE BLOCK ***** */
#include "mozilla/Hal.h"
#include "nsScreen.h"
#include "nsIDocShell.h"
#include "nsPresContext.h"
#include "nsCOMPtr.h"
#include "nsDOMClassInfoID.h"
#include "nsIInterfaceRequestorUtils.h"
#include "nsIDocShellTreeItem.h"
#include "nsLayoutUtils.h"
#include "nsContentUtils.h"
#include "mozilla/Preferences.h"
using namespace mozilla;
/* static */ bool nsScreen::sInitialized = false;
/* static */ bool nsScreen::sAllowScreenEnabledProperty = false;
/* static */ bool nsScreen::sAllowScreenBrightnessProperty = false;
/* static */ void
nsScreen::Initialize()
{
MOZ_ASSERT(!sInitialized);
sInitialized = true;
Preferences::AddBoolVarCache(&sAllowScreenEnabledProperty,
"dom.screenEnabledProperty.enabled");
Preferences::AddBoolVarCache(&sAllowScreenBrightnessProperty,
"dom.screenBrightnessProperty.enabled");
}
//
// Screen class implementation
//
nsScreen::nsScreen(nsIDocShell* aDocShell)
: mDocShell(aDocShell)
{
if (!sInitialized) {
Initialize();
}
}
nsScreen::~nsScreen()
{
}
DOMCI_DATA(Screen, nsScreen)
// QueryInterface implementation for nsScreen
NS_INTERFACE_MAP_BEGIN(nsScreen)
NS_INTERFACE_MAP_ENTRY(nsISupports)
NS_INTERFACE_MAP_ENTRY(nsIDOMScreen)
NS_DOM_INTERFACE_MAP_ENTRY_CLASSINFO(Screen)
NS_INTERFACE_MAP_END
NS_IMPL_ADDREF(nsScreen)
NS_IMPL_RELEASE(nsScreen)
NS_IMETHODIMP
nsScreen::SetDocShell(nsIDocShell* aDocShell)
{
mDocShell = aDocShell; // Weak Reference
return NS_OK;
}
NS_IMETHODIMP
nsScreen::GetTop(PRInt32* aTop)
{
nsRect rect;
nsresult rv = GetRect(rect);
*aTop = rect.y;
return rv;
}
NS_IMETHODIMP
nsScreen::GetLeft(PRInt32* aLeft)
{
nsRect rect;
nsresult rv = GetRect(rect);
*aLeft = rect.x;
return rv;
}
NS_IMETHODIMP
nsScreen::GetWidth(PRInt32* aWidth)
{
nsRect rect;
nsresult rv = GetRect(rect);
*aWidth = rect.width;
return rv;
}
NS_IMETHODIMP
nsScreen::GetHeight(PRInt32* aHeight)
{
nsRect rect;
nsresult rv = GetRect(rect);
*aHeight = rect.height;
return rv;
}
NS_IMETHODIMP
nsScreen::GetPixelDepth(PRInt32* aPixelDepth)
{
nsDeviceContext* context = GetDeviceContext();
if (!context) {
*aPixelDepth = -1;
return NS_ERROR_FAILURE;
}
PRUint32 depth;
context->GetDepth(depth);
*aPixelDepth = depth;
return NS_OK;
}
NS_IMETHODIMP
nsScreen::GetColorDepth(PRInt32* aColorDepth)
{
return GetPixelDepth(aColorDepth);
}
NS_IMETHODIMP
nsScreen::GetAvailWidth(PRInt32* aAvailWidth)
{
nsRect rect;
nsresult rv = GetAvailRect(rect);
*aAvailWidth = rect.width;
return rv;
}
NS_IMETHODIMP
nsScreen::GetAvailHeight(PRInt32* aAvailHeight)
{
nsRect rect;
nsresult rv = GetAvailRect(rect);
*aAvailHeight = rect.height;
return rv;
}
NS_IMETHODIMP
nsScreen::GetAvailLeft(PRInt32* aAvailLeft)
{
nsRect rect;
nsresult rv = GetAvailRect(rect);
*aAvailLeft = rect.x;
return rv;
}
NS_IMETHODIMP
nsScreen::GetAvailTop(PRInt32* aAvailTop)
{
nsRect rect;
nsresult rv = GetAvailRect(rect);
*aAvailTop = rect.y;
return rv;
}
nsDeviceContext*
nsScreen::GetDeviceContext()
{
return nsLayoutUtils::GetDeviceContextForScreenInfo(mDocShell);
}
nsresult
nsScreen::GetRect(nsRect& aRect)
{
nsDeviceContext *context = GetDeviceContext();
if (!context) {
return NS_ERROR_FAILURE;
}
context->GetRect(aRect);
aRect.x = nsPresContext::AppUnitsToIntCSSPixels(aRect.x);
aRect.y = nsPresContext::AppUnitsToIntCSSPixels(aRect.y);
aRect.height = nsPresContext::AppUnitsToIntCSSPixels(aRect.height);
aRect.width = nsPresContext::AppUnitsToIntCSSPixels(aRect.width);
return NS_OK;
}
nsresult
nsScreen::GetAvailRect(nsRect& aRect)
{
nsDeviceContext *context = GetDeviceContext();
if (!context) {
return NS_ERROR_FAILURE;
}
context->GetClientRect(aRect);
aRect.x = nsPresContext::AppUnitsToIntCSSPixels(aRect.x);
aRect.y = nsPresContext::AppUnitsToIntCSSPixels(aRect.y);
aRect.height = nsPresContext::AppUnitsToIntCSSPixels(aRect.height);
aRect.width = nsPresContext::AppUnitsToIntCSSPixels(aRect.width);
return NS_OK;
}
namespace {
bool IsWhiteListed(nsIDocShell *aDocShell) {
nsCOMPtr<nsIDocShellTreeItem> ds = do_QueryInterface(aDocShell);
if (!ds) {
return false;
}
PRInt32 itemType;
ds->GetItemType(&itemType);
if (itemType == nsIDocShellTreeItem::typeChrome) {
return true;
}
nsCOMPtr<nsIDocument> doc = do_GetInterface(aDocShell);
nsIPrincipal *principal = doc->NodePrincipal();
nsCOMPtr<nsIURI> principalURI;
principal->GetURI(getter_AddRefs(principalURI));
if (nsContentUtils::URIIsChromeOrInPref(principalURI,
"dom.mozScreenWhitelist")) {
return true;
}
return false;
}
} // anonymous namespace
nsresult
nsScreen::GetMozEnabled(bool *aEnabled)
{
if (!sAllowScreenEnabledProperty || !IsWhiteListed(mDocShell)) {
*aEnabled = true;
return NS_OK;
}
*aEnabled = hal::GetScreenEnabled();
return NS_OK;
}
nsresult
nsScreen::SetMozEnabled(bool aEnabled)
{
if (!sAllowScreenEnabledProperty || !IsWhiteListed(mDocShell)) {
return NS_OK;
}
// TODO bug 707589: When the screen's state changes, all visible windows
// should fire a visibility change event.
hal::SetScreenEnabled(aEnabled);
return NS_OK;
}
nsresult
nsScreen::GetMozBrightness(double *aBrightness)
{
if (!sAllowScreenEnabledProperty || !IsWhiteListed(mDocShell)) {
*aBrightness = 1;
return NS_OK;
}
*aBrightness = hal::GetScreenBrightness();
return NS_OK;
}
nsresult
nsScreen::SetMozBrightness(double aBrightness)
{
if (!sAllowScreenEnabledProperty || !IsWhiteListed(mDocShell)) {
return NS_OK;
}
NS_ENSURE_TRUE(0 <= aBrightness && aBrightness <= 1, NS_ERROR_INVALID_ARG);
hal::SetScreenBrightness(aBrightness);
return NS_OK;
}