![]() ![]() Must extract the stream (Stream-win2) from the window (Window-2) because Application-2 is rendering Upon receiving this event, the external compositor When Application-2 joins its window to the root window group, the external compositor receives a Upon receiving this event, the external compositor creates a consumer stream (Stream-cApp1), and connects it to the producer stream (Stream-App1). When Application-1 grants permissions to its producer stream to the external compositor, the external compositor receives a SCREEN_EVENT_CREATE event. An example of an external compositor in a system You can access their buffers using the window object instead of its stream object.įigure 1. ![]() Window-1 and Window-3 have associated streams, but because they aren't required to be referenced, they're shown faded in the example. Application-3 isn't consumed by the external compositor. In this specific example, Stream-App1 is owned and rendered to by Application-1, and Window-2 is owned and rendered to by Application-2. Let's take an example where an external compositor needs to compose content from two different sources: a stream, and a window. register for asynchronous notifications of type SCREEN_NOTIFY_UPDATE that are triggered by posts from the producer stream.connect consumer streams to the producer stream.a producer stream grants access permissions to the external compositorĪn external compositor, typically, does the following upon receipt of a SCREEN_EVENT_CREATE event:.a child window joins the root window's group.Therefore, anĮxternal compositor usually needs to manage multiple consumer streams, one for each producer stream.Īn external compositor receives a SCREEN_EVENT_CREATE event when: However, a consumer stream can be connected with only one producer stream. Handle SCREEN_EVENT_CREATE and SCREEN_EVENT_CLOSE events.Īn external compositor needs to manage events from all its child windows, and from any streams that it's consuming from.Īn external compositor may be consuming content from its child windows, other producer streams, orīoth.Screen_create_window_buffers(root_window, 2) You need a set of buffers to render or to compose content into. Screen_set_window_property_iv(root_window, SCREEN_PROPERTY_USAGE, (const int) ) The SCREEN_PROPERTY_USAGE property is set such that you can perform You're copying content from the child windows to the root window, then you want to ensure that The external compositor's root window group.ĭetermine the appropriate properties that you need to set on your root window. Once you have the root window's group name, ensure that child windows use it to join Screen_get_window_property_cv(root_window, SCREEN_PROPERTY_ID, sizeof(group_name), group_name) Retrieve this property from the root window by using SCREEN_PROPERTY_ID property of your root window must be the name of the group thatĬhild windows must join. In order for the root window to consume the content of its child windows, the Screen_create_window_type(&root_window, screen_ctx, (SCREEN_APPLICATION_WINDOW | SCREEN_ROOT_WINDOW)) Screen_create_context(&screen_ctx, SCREEN_APPLICATION_CONTEXT) The external compositor is consuming from producer streams only, rather than from child windows, it ![]() Window prevents Screen from composing the child windows. Generally, you need to perform the following steps in your external compositor to acquire the contentĪn external compositor must have a root window to perform composition. Screen's framebuffer to show the content on the display. Once the external compositor is ready to make its content visible, it calls It then takes the consumed content and composes it into An external compositorĬan also consume from other producer streams. Using its privileges, as a parent as well as a root, theĮxternal compositor's window consumes content from the streams of its child windows. Screen doesn't perform composition on any windows that have a root windowĪs their ancestor, this strategy allows for an external compositor to manage the windows in its root window Streams, or both), and in turn, renders content to its own root window. It consumes content from multiple sources (e.g., windows, Screen's composition manager maintainsĪn external compositor is essentially a consumer. The use of anĮxternal compositor is not intended to replace the composition manager component of Screen supports external composition (i.e., the use of aĬompositor that's not Screen) through the use of rootĪn external compositor is sometimes needed when a desired effect isn't supportedīy Screen (e.g., page curling effect, rotation effect, reveal effect, etc.).Īn external compositor provides clients with the ability to implement their own effects. ![]()
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |