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a4a9a46a87
first-class.
This implements the scheme described here:
https://groups.google.com/forum/#!topic/mozilla.dev.servo/sZVPSfPVfkg
This commit changes Servo to generate one display list per stacking
context instead of one display list per layer. This is purely a
refactoring; there are no functional changes. Performance is essentially
the same as before. However, there should be numerous future benefits
that this is intended to allow for:
* It makes the code simpler to understand because the "new layer needed"
vs. "no new layer needed" code paths are more consolidated.
* It makes it easy to support CSS properties that did not fit into our
previous flat display list model (without unconditionally layerizing
them):
o `opacity` should be easy to support because the stacking context
provides the higher-level grouping of display items to which opacity
is to be applied.
o `transform` can be easily supported because the stacking context
provides a place to stash the transformation matrix. This has the side
benefit of nicely separating the transformation matrix from the
clipping regions.
* The `flatten` logic is now O(1) instead of O(n) and now only needs to
be invoked for pseudo-stacking contexts (right now: just floats),
instead of for every stacking context.
* Layers are now a proper tree instead of a flat list as far as layout
is concerned, bringing us closer to a production-quality
compositing/layers framework.
* This commit opens the door to incremental display list construction at
the level of stacking contexts.
Future performance improvements could come from optimizing allocation of
display list items, and, of course, incremental display list
construction.
79 lines
1.9 KiB
Rust
79 lines
1.9 KiB
Rust
/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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#![feature(globs, macro_rules, phase, unsafe_destructor)]
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#![deny(unused_imports)]
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#![deny(unused_variables)]
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#![feature(phase)]
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#[phase(plugin, link)]
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extern crate log;
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extern crate azure;
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extern crate collections;
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extern crate geom;
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extern crate layers;
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extern crate libc;
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extern crate native;
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extern crate rustrt;
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extern crate stb_image;
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extern crate png;
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extern crate script_traits;
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extern crate serialize;
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extern crate unicode;
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#[phase(plugin)]
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extern crate "plugins" as servo_plugins;
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extern crate "net" as servo_net;
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#[phase(plugin, link)]
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extern crate "util" as servo_util;
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extern crate "msg" as servo_msg;
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extern crate style;
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extern crate sync;
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extern crate time;
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extern crate url;
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// Eventually we would like the shaper to be pluggable, as many operating systems have their own
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// shapers. For now, however, this is a hard dependency.
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extern crate harfbuzz;
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// Linux and Android-specific library dependencies
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#[cfg(any(target_os="linux", target_os = "android"))]
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extern crate fontconfig;
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#[cfg(any(target_os="linux", target_os = "android"))]
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extern crate freetype;
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// Mac OS-specific library dependencies
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#[cfg(target_os="macos")] extern crate core_foundation;
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#[cfg(target_os="macos")] extern crate core_graphics;
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#[cfg(target_os="macos")] extern crate core_text;
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pub use render_context::RenderContext;
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// Private rendering modules
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mod render_context;
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// Rendering
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pub mod color;
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#[path="display_list/mod.rs"]
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pub mod display_list;
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pub mod render_task;
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// Fonts
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pub mod font;
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pub mod font_context;
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pub mod font_cache_task;
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pub mod font_template;
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// Misc.
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mod buffer_map;
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// Platform-specific implementations.
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#[path="platform/mod.rs"]
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pub mod platform;
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// Text
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#[path = "text/mod.rs"]
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pub mod text;
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