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* If the same shape alpha mask is set again and again, we now keep the rendered masks in a cache. On certain websites, WebKit sets the same shape for clipping hundreds of times, which uses a lot of time to render the masks. * When a shape mask was generated, we put it into AlphaMaskCache. The constructor for ShapeAlphaMask is made private and a factory method is used for instantiation instead, which transparently looks up in the cache whether a suitable mask was already generated before (so the entire caching is encapsulated inside the AlphaMask class). * When taking a mask out of the cache, we still create a new AlphaMask instance. However, the new instance will share the mask bitmap with the previously generated instance (aside from the rendering of their bitmap, AlphaMask instances are pretty lightweight). Shape masks are only seen as identical when their shape is the same, the inverse flag, and they have the same parent mask. * Cache is limited to a fixed size of currently 8 MiB, using a simple random replacement scheme. An LRU scheme can be added in the future if necessary. Counting of bytes for the cache size includes parent masks of masks in the cache, even if the parent itself is not cached. A reference counter for "indirect" cache references keeps track of which masks are not part of the cache, but still need to be added to the cache byte size. * For now, only for ShapeAlphaMasks, other mask types can be added as necessary.
Haiku
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Haiku is an open-source operating system that specifically targets personal computing. Inspired by the BeOS, Haiku is fast, simple to use, easy to learn and yet very powerful.
Goals
- Sensible defaults with minimal configuration required.
- Clean, clear, concise code.
- Unified desktop environment.
Trying Haiku
Haiku provides pre-built nightly images and release images. Haiku is compatible with a large variety of hardware, but in case you don't want to "take the plunge" and install Haiku on bare metal, you can install it on a virtual machine (VM) instead. If you've never used a VM before, you can follow one of the "Emulating Haiku" guides.
Compiling Haiku
See ReadMe.Compiling.
Contributing
Haiku is a meritocratic open source project with a large variety of tasks. Even if you can't write code, you can still help! Haiku needs designers, (technical) writers, translators, testers... Get involved and help out!
Contributing code
If you're submitting a patch to us, please make sure you're following the patch submitting guidelines.
If you're having trouble finding something in the source tree, you can use one of our OpenGrok servers:
- http://xref.plausible.coop/ (provided by Landon Fuller)
- http://code.metager.de/source/xref/haiku (provided by MetaGer)
Contributing documentation
The main piece of documentation that still needs work are the API docs (found
in the tree at docs/user). Just find an undocumented class, write
documentation for it, and submit a patch.
Contributing translations
See wiki:i18n.
Contributing software ports
See HaikuPorts.