Multiplane overlay support - Windows drivers | Microsoft Docs
Don't overlook Microsoft's toolbar for Windows 10 gaming. Consumer Advice · Digital Assistants · Displays · E-readers it won't open because the game is in full-screen mode—you can still In fact, all of the settings related to Game Mode, Game DVR, Beam, and E-commerce Affiliate Relationships. The lean back mode is for fullscreen experiences in which users won't be avesisland.infoUiVisibility = (avesisland.info_UI_FLAG_IMMERSIVE. Windows are displayed with shadows at the logical representation level to highlight the fact, that the semantics are Relationship between DOpE, the Overlay Mediator and XFree86 . tem, is presented to the user as one host window or as full tion 5 we give an overview about related work and put our.
Compiz displays a wide array of 2D and 3D effects and has relatively low hardware requirements. It uses the display engine Clutter, which has been ported to all major operating systems, netbooks and smartphones. KWin features much of the same functionality also present in Compiz.
Project Looking Glass Project Looking Glass was a window manager combining 3D rendering and the cross-platform Java programming language.
- Compositing window manager
- Multiplane overlay support
- Hide the status bar
In the aftermath of it being discontinued, some of its features, such as cover switching and thumbnail live previews, have found their way onto other window managers. Its more original features included window tilting, two-sided window frames and parallax scrolling backgrounds. As such, their window managers have mostly planar rendering capabilities that include composite layering, alpha blending, gradients, high resolution and multiple desktops "screens" that can partially clip one another.
Microsoft Windows[ edit ] While the window manager in Windows does perform compositing, it does not perform transformations such as a per-pixel alpha.
Few commercial applications took advantage of alpha blending; freeware programs were among the first to experiment with it, albeit through optional settings.
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In addition, it is automatically disabled by Windows in order to perform hardware overlay through the Overlay Mixer Filter. Usability and eye candy[ edit ] The compositing approach makes it easier to implement a number of features that make the user interface more accessible, simpler to use or with eye candy elements.
Magnifiers[ edit ] The magnification effect in Compiz click image to view in scale. Vector graphicssuch as TrueType fonts and 3D-accelerated elements, can be expanded without degradation usually due to aliasing. A screen magnifier enlarges an area of the screen, making portions of text easier to read — whether to prevent eye strainfor the visually impairedor simply at a distance.
Zoom effects such as the fish eye magnifier and zoom desktop effects provide this functionality. Live preview[ edit ] A preview of a window can be displayed in a pop-up thumbnail when the user hovers its associated taskbar button. This allows the user to identify and manage several concurrently running programs. Window switching[ edit ] Basic window switching in Xgl.
Windows with similar names and icons tend to cause confusion, especially when their title bars overlap; the position of every such window on the taskbar has to be memorized. When there are many open windows in this manner, the user often has to resort to trial and error—clicking each taskbar button one-by-one—before proceeding.
Window switching allows one to quickly preview several windows at once by temporarily rearranging them against a decorative background. After a selection is made, the windows are then restored to their original arrangement. Selection begins when the user either enters a hotkey combinationmoves the mouse pointer to a hotspot on the screenor, in some situations, uses the mouse's scroll wheel.
Items are navigated using the keyboard or mouse. An item is selected by either releasing the hotkey, hitting the Enter key or clicking on it with the mouse. Flip switching[ edit ] Flip switching in Compiz. The flip switcher is an enhancement to the Alt-Tab switching feature. Running windows are arranged into a stack — similar to a flip-style selector in a s jukeboxor a Rolodex. In some systems, the user can press Alt-Shift-Tab to navigate backwards.
Visual transitions are applied to each item while navigating. Cover switching[ edit ] Cover Switch in KWin. Cover switching is like flip switching with a few, mostly visual, differences. This kind of windows can overlay above other applications. This permission is not included in the new request permission structure that was introduced in Marshmallow and follows a completely different approach. One of its major differences is that it cannot be granted through the app like all the other permissions.
In general when an app is in the foreground, users can interact with it and they loose this ability when it goes to the background and is paused. With WindowManager you can easily add an overlay view in a System Window on top of everything, that users can still interact with, even if the application is paused and is hidden.
Depending on how you want this overlay view to be placed and the lifetime that you want to achieve, you can obtain reference to WindowManager with different ways and add a view through an Activity or a Service.
Overlay through the context of an activity A WindowManager can be easily obtained: LayoutParams This methods performs three major steps: Checks whether the window has been already been added Determines the type of the window and if is a child window, and if yes, it attaches it to its parent window It creates a new ViewRootImpl object and calls its setView method.
Enable fullscreen mode
This type is a non-application window type that is normally placed above all applications but resides behind the status bar. Once you add an overlay view as a System Window with window manager through the context of an activity, a new window with its own view hierarchy is created and added above the current window of the activity.
We can use Android Device Monitor and Hierarchy Viewer to see the list of available windows on the system. As we can see a new window is created with its own view hierarchy. This window has a null window token however is associated as we may see with the MainActivity.
We can see from the list of available tokens that we have the top level AppWindowToken for MainActivity and WindowToken for our overlay window is also listed but has a null value. If we start a second activity, without destroying the first activity, we can see that a new window and a new AppWindowToken has been created for that activity while the overlay view still resides on top of everything.
As far as the activity is not destroyed there is no issue.
However, once that activity is destroyed a Window leak occurs if the overlay view is not removed in advance. If we dive deeper into this, we will see that what happens is relevant to Window Tokens.
If we see into Android code, in WindowManagerGlobal implementation, when an activity is destroyed, it notifies WindowManagerGlobal to try and close all windows associated with that activity.
The overlay window has a null window token but is still referenced from the context of the activity. This is the point where a window leak will occur. There are two different ways to achieve that: However once the app is destroyed, the Overlay window will be removed too.
Enable fullscreen mode | Android Developers
This trick allows the Overlay view to live as far as the app lives. Once the application stops the Overlay view is removed too. Overlay through a service Another way to create an Overlay as a System Window that will be added above other applications is by adding that overlay through WindowManager in the same way as described in previous section but through a service that can run in the background.
A common usage of this approach can be found in Facebook chatheads and other popular apps.