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Implement basic Time To First Paint and First Contentful Paint PWMs
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parent
20a3b0236d
commit
892b30edca
20 changed files with 213 additions and 10 deletions
113
components/metrics/lib.rs
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113
components/metrics/lib.rs
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/* 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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extern crate gfx;
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extern crate profile_traits;
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extern crate servo_config;
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extern crate time;
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use gfx::display_list::{DisplayItem, DisplayList};
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use profile_traits::time::{ProfilerChan, ProfilerCategory, send_profile_data};
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use profile_traits::time::TimerMetadata;
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use servo_config::opts;
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use std::cell::Cell;
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pub trait ProfilerMetadataFactory {
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fn new_metadata(&self) -> Option<TimerMetadata>;
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}
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macro_rules! make_time_setter(
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( $attr:ident, $func:ident, $category:ident, $label:expr ) => (
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fn $func<T>(&self, profiler_metadata_factory: &T)
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where T: ProfilerMetadataFactory {
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let navigation_start = match self.navigation_start {
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Some(time) => time,
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None => {
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println!("Trying to set metric before navigation start");
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return;
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}
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};
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let now = time::precise_time_ns() as f64;
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let time = now - navigation_start;
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self.$attr.set(Some(time));
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// Send the metric to the time profiler.
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send_profile_data(ProfilerCategory::$category,
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profiler_metadata_factory.new_metadata(),
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&self.time_profiler_chan,
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time as u64, time as u64, 0, 0);
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// Print the metric to console if the print-pwm option was given.
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if opts::get().print_pwm {
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println!("{:?} {:?}", $label, time);
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}
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}
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);
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);
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pub struct PaintTimeMetrics {
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navigation_start: Option<f64>,
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first_paint: Cell<Option<f64>>,
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first_contentful_paint: Cell<Option<f64>>,
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time_profiler_chan: ProfilerChan,
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}
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impl PaintTimeMetrics {
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pub fn new(time_profiler_chan: ProfilerChan)
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-> PaintTimeMetrics {
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PaintTimeMetrics {
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navigation_start: None,
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first_paint: Cell::new(None),
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first_contentful_paint: Cell::new(None),
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time_profiler_chan: time_profiler_chan,
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}
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}
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pub fn set_navigation_start(&mut self, time: f64) {
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self.navigation_start = Some(time);
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}
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make_time_setter!(first_paint, set_first_paint,
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TimeToFirstPaint,
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"first-paint");
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make_time_setter!(first_contentful_paint, set_first_contentful_paint,
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TimeToFirstContentfulPaint,
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"first-contentful-paint");
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pub fn maybe_set_first_paint<T>(&self, profiler_metadata_factory: &T)
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where T: ProfilerMetadataFactory {
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{
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if self.first_paint.get().is_some() {
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return;
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}
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}
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self.set_first_paint(profiler_metadata_factory);
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}
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pub fn maybe_set_first_contentful_paint<T>(&self, profiler_metadata_factory: &T,
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display_list: &DisplayList)
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where T: ProfilerMetadataFactory {
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{
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if self.first_contentful_paint.get().is_some() {
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return;
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}
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}
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// Analyze display list to figure out if this is the first contentful
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// paint (i.e. the display list contains items of type text, image,
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// non-white canvas or SVG)
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for item in &display_list.list {
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match item {
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&DisplayItem::Text(_) |
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&DisplayItem::Image(_) => {
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self.set_first_contentful_paint(profiler_metadata_factory);
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return;
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},
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_ => (),
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}
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}
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}
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}
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