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-rw-r--r--widget/ScreenManager.cpp261
1 files changed, 261 insertions, 0 deletions
diff --git a/widget/ScreenManager.cpp b/widget/ScreenManager.cpp
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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 "mozilla/WidgetUtilsGtk.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);
+}
+
+// static
+void ScreenManager::Refresh(nsTArray<RefPtr<Screen>>&& aScreens) {
+ if (PastShutdownPhase(ShutdownPhase::XPCOMShutdown)) {
+ // We don't refresh screen data if starting XPCOM shutdown path.
+ // GetSingleton returns invalid data since it is freed.
+ return;
+ }
+ MOZ_LOG(sScreenLog, LogLevel::Debug, ("Refresh screens"));
+ GetSingleton().RefreshInternal(std::move(aScreens));
+}
+
+void ScreenManager::Refresh(nsTArray<mozilla::dom::ScreenDetails>&& aScreens) {
+ MOZ_LOG(sScreenLog, LogLevel::Debug, ("Refresh screens from IPC"));
+
+ AutoTArray<RefPtr<Screen>, 4> screens;
+ for (auto& screen : aScreens) {
+ screens.AppendElement(new Screen(screen));
+ }
+ RefreshInternal(std::move(screens));
+}
+
+void ScreenManager::RefreshInternal(nsTArray<RefPtr<Screen>>&& aScreens) {
+ mScreenList = std::move(aScreens);
+
+ CopyScreensToAllRemotesIfIsParent();
+ if (nsCOMPtr<nsIObserverService> s = services::GetObserverService()) {
+ s->NotifyObservers(nullptr, "screen-information-changed", nullptr);
+ }
+}
+
+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) {
+ DesktopIntRect rect(aX, aY, aWidth, aHeight);
+ nsCOMPtr<nsIScreen> screen = ScreenForRect(rect);
+ screen.forget(aOutScreen);
+ return NS_OK;
+}
+
+already_AddRefed<Screen> ScreenManager::ScreenForRect(
+ const DesktopIntRect& aRect) {
+#if defined(MOZ_WAYLAND) && defined(MOZ_LOGGING)
+ static bool inWayland = GdkIsWaylandDisplay();
+ 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."));
+ auto screen = MakeRefPtr<Screen>(
+ LayoutDeviceIntRect(), LayoutDeviceIntRect(), 0, 0, 0,
+ DesktopToLayoutDeviceScale(), CSSToLayoutDeviceScale(), 96 /* dpi */,
+ Screen::IsPseudoDisplay::No, hal::ScreenOrientation::None, 0);
+ return screen.forget();
+ }
+
+ // 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();
+ }
+
+ // 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;
+ 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, aRect);
+ 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;
+ return ret.forget();
+ }
+
+ // 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 (aRect.x > (x + width)) {
+ distanceX = aRect.x - (x + width);
+ } else if (aRect.XMost() < x) {
+ distanceX = x - aRect.XMost();
+ }
+
+ uint32_t distanceY = 0;
+ if (aRect.y > (y + height)) {
+ distanceY = aRect.y - (y + height);
+ } else if (aRect.YMost() < y) {
+ distanceY = y - aRect.YMost();
+ }
+
+ uint32_t tempDistance = distanceX * distanceX + distanceY * distanceY;
+ if (tempDistance < distance) {
+ which = screen.get();
+ distance = tempDistance;
+ if (distance == 0) {
+ break;
+ }
+ }
+ }
+
+ RefPtr<Screen> ret = which;
+ return ret.forget();
+}
+
+// The screen with the menubar/taskbar. This shouldn't be needed very
+// often.
+//
+already_AddRefed<Screen> ScreenManager::GetPrimaryScreen() {
+ if (mScreenList.IsEmpty()) {
+ MOZ_LOG(sScreenLog, LogLevel::Warning,
+ ("No screen available. This can happen in xpcshell."));
+ return MakeAndAddRef<Screen>(
+ LayoutDeviceIntRect(), LayoutDeviceIntRect(), 0, 0, 0,
+ DesktopToLayoutDeviceScale(), CSSToLayoutDeviceScale(), 96 /* dpi */,
+ Screen::IsPseudoDisplay::No, hal::ScreenOrientation::None, 0);
+ }
+
+ return do_AddRef(mScreenList[0]);
+}
+
+NS_IMETHODIMP
+ScreenManager::GetPrimaryScreen(nsIScreen** aPrimaryScreen) {
+ nsCOMPtr<nsIScreen> screen = GetPrimaryScreen();
+ screen.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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