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Add docs to image_cache_task

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This commit is contained in:
Brian Anderson 2012-08-10 17:27:28 -07:00
parent dd3d5e3cd1
commit e4a09a3287
1 changed files with 10 additions and 0 deletions
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10
src/servo/resource/image_cache_task.rs
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@ -14,8 +14,12 @@ import core::arc::arc;
import clone_arc = core::arc::clone; import clone_arc = core::arc::clone;
enum Msg { enum Msg {
/// Tell the cache that we may need a particular image soon. Must be posted
/// before GetImage
Prefetch(url), Prefetch(url),
/// Request an Image object for a URL
GetImage(url, chan<ImageResponseMsg>), GetImage(url, chan<ImageResponseMsg>),
/// Used by the decoder tasks to post decoded images back to the cache
StoreImage(url, arc<~Image>), StoreImage(url, arc<~Image>),
Exit Exit
} }
@ -40,10 +44,16 @@ fn image_cache_task(resource_task: ResourceTask) -> ImageCacheTask {
} }
struct ImageCache { struct ImageCache {
/// A handle to the resource task for fetching the image binaries
resource_task: ResourceTask; resource_task: ResourceTask;
/// The port on which we'll receive client requests
from_client: port<Msg>; from_client: port<Msg>;
/// A map from URLs to the partially loaded compressed image data.
/// Once the data is complete it is then sent to a decoder
prefetch_map: UrlMap<@PrefetchData>; prefetch_map: UrlMap<@PrefetchData>;
/// A list of clients waiting on images that are currently being decoded
future_image_map: UrlMap<@FutureData>; future_image_map: UrlMap<@FutureData>;
/// The cache of decoded images
image_map: UrlMap<@arc<~Image>>; image_map: UrlMap<@arc<~Image>>;
} }