#15370: [HaikuDepot] Load and Unload Icons On Demand
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Reporter: apl-haiku | Owner: nobody
Type: bug | Status: new
Priority: normal | Milestone: Unscheduled
Component: - General | Version: R1/Development
Keywords: | Blocked By:
Blocking: | Has a Patch: 0
Platform: All |
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A significant part of the startup process of HaikuDepot is the loading of
all of the icons for the packages present in the system's repository. The
runtime memory overhead of all of the icons appears to be circa 8MB.
The current approach was probably sound to start with when there were few
packages, but now the quantity of packages has grown the cost of loading
all of the icons is no longer trivial. A better approach would be to load
the icons 'on demand' from some sort of an LRU cache.
== Situations
There are two situations where packages' icons are required.
The first is in the main list of packages (either "all" or "featured").
Here the logic is controlled by the class {{{PackageListView}}} which is
subclassing from {{{BColumnListView}}} (private).
The second is in the lower portion of the window where packages' details
are displayed. The icon there is shown next to the name in the top left
corner. The class involved here is {{{TitleView}}} (see
PackageInfoView.cpp).
== Solution
An LRU cache is used that holds a fixed number of icons; say 100 or so.
Possibly the class {{{LocalIconStore}}} could be modified to suit this
additional functionality.
If the user scrolls fast through the list of packages then the icons would
not be loaded at this high speed of scrolling. If the scrolling slows so
that an icon were to be visible for > 1s or so then the icon should be
loaded and should be displayed once it were loaded.
For the packages' details, the icon load should be initiated as soon as
the package details are displayed. Once the icon is loaded then it should
be displayed.
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Ticket URL: <https://dev.haiku-os.org/ticket/15370>
Haiku <https://dev.haiku-os.org>
The Haiku operating system.
