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DisplayChannel: add documentation for Ring types

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The Surface and Display channels each have a 'current_list' Ring, and
Surface also has a 'current' Ring. these names are confusing, so at
minimum, add a comment indicating the type of object they hold. The
DisplayChannel::current_list already had a comment, but it was
incorrect.

Signed-off-by: Jonathon Jongsma <jjongsma@redhat.com>
Acked-by: Frediano Ziglio <fziglio@redhat.com>
This commit is contained in:
Jonathon Jongsma 2017-01-13 15:01:05 -06:00
parent 43f62e46ca
commit 11629023c4
2 changed files with 12 additions and 1 deletions
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6
server/display-channel-private.h
View File

@ -41,7 +41,11 @@ struct DisplayChannelPrivate
int enable_jpeg;
int enable_zlib_glz_wrap;
Ring current_list; // of TreeItem
/* A ring of pending drawables for this DisplayChannel, regardless of which
* surface they're associated with. This list is mainly used to flush older
* drawables when we need to make room for new drawables. The ring is
* maintained in order of age, the tail being the oldest drawable */
Ring current_list;
uint32_t drawable_count;
_Drawable drawables[NUM_DRAWABLES];

7
server/display-channel.h
View File

@ -162,7 +162,14 @@ typedef struct DrawContext {
typedef struct RedSurface {
uint32_t refs;
/* A Ring representing a hierarchical tree structure. This tree includes
* DrawItems, Containers, and Shadows. It is used to efficiently determine
* which drawables overlap, and to exclude regions of drawables that are
* obscured by other drawables */
Ring current;
/* A ring of pending Drawables associated with this surface. This ring is
* actually used for drawing. The ring is maintained in order of age, the
* tail being the oldest drawable. */
Ring current_list;
DrawContext context;