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Update and fix comments

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This commit is contained in:
Jasper St. Pierre 2013-03-14 17:55:24 -04:00
parent 0bb8d29be4
commit e46c7fd27b
2 changed files with 12 additions and 9 deletions
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16
src/compositor/meta-window-group.h
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@ -10,13 +10,15 @@
/**
* MetaWindowGroup:
*
* This class is a subclass of ClutterGroup with special handling for
* MetaWindowActor when painting the group. When we are painting a stack
* of 5-10 maximized windows, the standard bottom-to-top method of
* drawing every actor results in a tremendous amount of overdraw
* and can easily max out the available memory bandwidth on a low-end
* graphics chipset. It's even worse if window textures are being accessed
* over the AGP bus.
* This class is a subclass of ClutterActor with special handling for
* MetaWindowActor/MetaBackgroundActor/MetaBackgroundGroup when painting
* children.
*
* When we are painting a stack of 5-10 maximized windows, the
* standard bottom-to-top method of drawing every actor results in a
* tremendous amount of overdraw and can easily max out the available
* memory bandwidth on a low-end graphics chipset. It's even worse if
* window textures are being accessed over the AGP bus.
*
* The basic technique applied here is to do a pre-pass before painting
* where we walk window from top to bottom and compute the visible area

5
src/meta/meta-background-group.h
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@ -9,8 +9,9 @@
* MetaBackgroundGroup:
*
* This class is a subclass of ClutterActor with special handling for
* MetaBackgroundActor when painting the group. It makes sure to only
* draw the parts of the backgrounds not occluded by opaque windows.
* MetaBackgroundActor/MetaBackgroundGroup when painting children.
* It makes sure to only draw the parts of the backgrounds not
* occluded by opaque windows.
*
* See #MetaWindowGroup for more information behind the motivation,
* and details on implementation.