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/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* vim: set ts=8 sts=2 et sw=2 tw=80: */
/* 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/. */
#include "ScreenManager.h"
#include "mozilla/ClearOnShutdown.h"
#include "mozilla/dom/ContentParent.h"
#include "mozilla/dom/DOMTypes.h"
#include "mozilla/Logging.h"
#include "mozilla/StaticPtr.h"
#ifdef MOZ_WAYLAND
# include <gdk/gdk.h>
# include <gdk/gdkx.h>
# include <gdk/gdkwayland.h>
#endif /* MOZ_WAYLAND */
static mozilla::LazyLogModule sScreenLog("WidgetScreen");
namespace mozilla::widget {
NS_IMPL_ISUPPORTS(ScreenManager, nsIScreenManager)
ScreenManager::ScreenManager() = default;
ScreenManager::~ScreenManager() = default;
static StaticRefPtr<ScreenManager> sSingleton;
ScreenManager& ScreenManager::GetSingleton() {
if (!sSingleton) {
sSingleton = new ScreenManager();
ClearOnShutdown(&sSingleton);
}
return *sSingleton;
}
already_AddRefed<ScreenManager> ScreenManager::GetAddRefedSingleton() {
RefPtr<ScreenManager> sm = &GetSingleton();
return sm.forget();
}
void ScreenManager::SetHelper(UniquePtr<Helper> aHelper) {
mHelper = std::move(aHelper);
}
void ScreenManager::Refresh(nsTArray<RefPtr<Screen>>&& aScreens) {
MOZ_LOG(sScreenLog, LogLevel::Debug, ("Refresh screens"));
mScreenList = std::move(aScreens);
CopyScreensToAllRemotesIfIsParent();
}
void ScreenManager::Refresh(nsTArray<mozilla::dom::ScreenDetails>&& aScreens) {
MOZ_LOG(sScreenLog, LogLevel::Debug, ("Refresh screens from IPC"));
mScreenList.Clear();
for (auto& screen : aScreens) {
mScreenList.AppendElement(new Screen(screen));
}
CopyScreensToAllRemotesIfIsParent();
}
template <class Range>
void ScreenManager::CopyScreensToRemoteRange(Range aRemoteRange) {
AutoTArray<dom::ScreenDetails, 4> screens;
for (auto& screen : mScreenList) {
screens.AppendElement(screen->ToScreenDetails());
}
for (auto cp : aRemoteRange) {
MOZ_LOG(sScreenLog, LogLevel::Debug,
("Send screens to [Pid %d]", cp->Pid()));
if (!cp->SendRefreshScreens(screens)) {
MOZ_LOG(sScreenLog, LogLevel::Error,
("SendRefreshScreens to [Pid %d] failed", cp->Pid()));
}
}
}
void ScreenManager::CopyScreensToRemote(dom::ContentParent* aContentParent) {
MOZ_ASSERT(aContentParent);
MOZ_ASSERT(XRE_IsParentProcess());
auto range = {aContentParent};
CopyScreensToRemoteRange(range);
}
void ScreenManager::CopyScreensToAllRemotesIfIsParent() {
if (XRE_IsContentProcess()) {
return;
}
MOZ_LOG(sScreenLog, LogLevel::Debug, ("Refreshing all ContentParents"));
CopyScreensToRemoteRange(
dom::ContentParent::AllProcesses(dom::ContentParent::eLive));
}
// Returns the screen that contains the rectangle. If the rect overlaps
// multiple screens, it picks the screen with the greatest area of intersection.
//
// The coordinates are in desktop pixels.
//
NS_IMETHODIMP
ScreenManager::ScreenForRect(int32_t aX, int32_t aY, int32_t aWidth,
int32_t aHeight, nsIScreen** aOutScreen) {
#if defined(MOZ_WAYLAND) && defined(MOZ_LOGGING)
static bool inWayland = gdk_display_get_default() &&
!GDK_IS_X11_DISPLAY(gdk_display_get_default());
if (inWayland) {
MOZ_LOG(sScreenLog, LogLevel::Warning,
("Getting screen in wayland, primary display will be returned."));
}
#endif
if (mScreenList.IsEmpty()) {
MOZ_LOG(sScreenLog, LogLevel::Warning,
("No screen available. This can happen in xpcshell."));
RefPtr<Screen> ret = new Screen(
LayoutDeviceIntRect(), LayoutDeviceIntRect(), 0, 0,
DesktopToLayoutDeviceScale(), CSSToLayoutDeviceScale(), 96 /* dpi */);
ret.forget(aOutScreen);
return NS_OK;
}
// Optimize for the common case. If the number of screens is only
// one then just return the primary screen.
if (mScreenList.Length() == 1) {
return GetPrimaryScreen(aOutScreen);
}
// which screen should we return?
Screen* which = mScreenList[0].get();
// walk the list of screens and find the one that has the most
// surface area.
uint32_t area = 0;
DesktopIntRect windowRect(aX, aY, aWidth, aHeight);
for (auto& screen : mScreenList) {
int32_t x, y, width, height;
x = y = width = height = 0;
screen->GetRectDisplayPix(&x, &y, &width, &height);
// calculate the surface area
DesktopIntRect screenRect(x, y, width, height);
screenRect.IntersectRect(screenRect, windowRect);
uint32_t tempArea = screenRect.Area();
if (tempArea > area) {
which = screen.get();
area = tempArea;
}
}
// If the rect intersects one or more screen,
// return the screen that has the largest intersection.
if (area > 0) {
RefPtr<Screen> ret = which;
ret.forget(aOutScreen);
return NS_OK;
}
// If the rect does not intersect a screen, find
// a screen that is nearest to the rect.
uint32_t distance = UINT32_MAX;
for (auto& screen : mScreenList) {
int32_t x, y, width, height;
x = y = width = height = 0;
screen->GetRectDisplayPix(&x, &y, &width, &height);
uint32_t distanceX = 0;
if (aX > (x + width)) {
distanceX = aX - (x + width);
} else if ((aX + aWidth) < x) {
distanceX = x - (aX + aWidth);
}
uint32_t distanceY = 0;
if (aY > (y + height)) {
distanceY = aY - (y + height);
} else if ((aY + aHeight) < y) {
distanceY = y - (aY + aHeight);
}
uint32_t tempDistance = distanceX * distanceX + distanceY * distanceY;
if (tempDistance < distance) {
which = screen.get();
distance = tempDistance;
if (distance == 0) {
break;
}
}
}
RefPtr<Screen> ret = which;
ret.forget(aOutScreen);
return NS_OK;
}
// The screen with the menubar/taskbar. This shouldn't be needed very
// often.
//
NS_IMETHODIMP
ScreenManager::GetPrimaryScreen(nsIScreen** aPrimaryScreen) {
if (mScreenList.IsEmpty()) {
MOZ_LOG(sScreenLog, LogLevel::Warning,
("No screen available. This can happen in xpcshell."));
RefPtr<Screen> ret = new Screen(
LayoutDeviceIntRect(), LayoutDeviceIntRect(), 0, 0,
DesktopToLayoutDeviceScale(), CSSToLayoutDeviceScale(), 96 /* dpi */);
ret.forget(aPrimaryScreen);
return NS_OK;
}
RefPtr<Screen> ret = mScreenList[0];
ret.forget(aPrimaryScreen);
return NS_OK;
}
NS_IMETHODIMP
ScreenManager::GetTotalScreenPixels(int64_t* aTotalScreenPixels) {
MOZ_ASSERT(aTotalScreenPixels);
if (mScreenList.IsEmpty()) {
MOZ_LOG(sScreenLog, LogLevel::Warning,
("No screen available. This can happen in xpcshell."));
*aTotalScreenPixels = 0;
return NS_OK;
}
int64_t pixels = 0;
for (auto& screen : mScreenList) {
int32_t x, y, width, height;
x = y = width = height = 0;
screen->GetRect(&x, &y, &width, &height);
pixels += width * height;
}
*aTotalScreenPixels = pixels;
return NS_OK;
}
} // namespace mozilla::widget
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