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xcb_damage_create(3) XCB Requests xcb_damage_create(3) NAME xcb_damage_create - Creates a Damage object to monitor changes to a draw- able. SYNOPSIS #include <xcb/damage.h> Request function xcb_void_cookie_t xcb_damage_create(xcb_connection_t *conn, xcb_damage_dam- age_t damage, xcb_drawable_t drawable, uint8_t level); REQUEST ARGUMENTS conn The XCB connection to X11. damage The ID with which you will refer to the new Damage object, cre- ated by xcb_generate_id. drawable The ID of the drawable to be monitored. level The level of detail to be provided in Damage events. DESCRIPTION This creates a Damage object to monitor changes to a drawable, and speci- fies the level of detail to be reported for changes. We call changes made to pixel contents of windows and pixmaps 'damage' throughout this extension. Damage accumulates as drawing occurs in the drawable. Each drawing opera- tion are guaranteed to include the set of pixels modified by each opera- tion, but may include significantly more than just those pixels. The de- sire is for the damage to strike a balance between the number of rectangles reported and the extraneous area included. A reasonable goal is for each primitive object drawn (line, string, rectangle) to be represented as a single rectangle and for the damage area of the operation to be the union of these rectangles. The DAMAGE extension allows applications to either receive the raw rectan- gles as a stream of events, or to have them partially processed within the X server to reduce the amount of data transmitted as well as reduce the processing latency once the repaint operation has started. The Damage object holds any accumulated damage region and reflects the re- lationship between the drawable selected for damage notification and the drawable for which damage is tracked. RETURN VALUE Returns an xcb_void_cookie_t. Errors (if any) have to be handled in the event loop. If you want to handle errors directly with xcb_request_check instead, use xcb_damage_create_checked. See xcb-requests(3) for details. ERRORS This request does never generate any errors. SEE ALSO xcb-requests(3) AUTHOR Generated from damage.xml. Contact xcb@lists.freedesktop.org for correc- tions and improvements. X Version 11 libxcb 1.17.0 xcb_damage_create(3)
NAME | SYNOPSIS | REQUEST ARGUMENTS | DESCRIPTION | RETURN VALUE | ERRORS | SEE ALSO | AUTHOR
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