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Allow dumping the optimized display list (DL).
This DL is created at paint time, per tile. To dump,
pass -Z dump-display-list-optimized at startup.
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Adenilson committed Apr 17, 2015
1 parent 653b40d commit ad62ff5
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Showing 2 changed files with 13 additions and 1 deletion.
6 changes: 6 additions & 0 deletions components/gfx/display_list/
Expand Up @@ -34,6 +34,7 @@ use libc::uintptr_t;
use paint_task::PaintLayer;
use msg::compositor_msg::LayerId;
use net_traits::image::base::Image;
use util::opts;
use util::cursor::Cursor;
use util::linked_list::prepend_from;
use util::geometry::{self, Au, MAX_RECT, ZERO_RECT};
Expand Down Expand Up @@ -280,6 +281,11 @@ impl StackingContext {
let display_list =

if opts::get().dump_display_list_optimized {
println!("**** optimized display list. Tile bounds: {:?}", tile_bounds);

// Sort positioned children according to z-index.
let mut positioned_children = SmallVec8::new();
for kid in display_list.children.iter() {
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8 changes: 7 additions & 1 deletion components/util/
Expand Up @@ -121,9 +121,12 @@ pub struct Opts {
/// Dumps the flow tree after a layout.
pub dump_flow_tree: bool,

/// Dumps the flow tree after a layout.
/// Dumps the display list after a layout.
pub dump_display_list: bool,

/// Dumps the display list after optimization (post layout, at painting time).
pub dump_display_list_optimized: bool,

/// Emits notifications when there is a relayout.
pub relayout_event: bool,

Expand Down Expand Up @@ -156,6 +159,7 @@ pub fn print_debug_usage(app: &str) {
print_option("disable-text-aa", "Disable antialiasing of rendered text.");
print_option("dump-flow-tree", "Print the flow tree after each layout.");
print_option("dump-display-list", "Print the display list after each layout.");
print_option("dump-display-list-optimized", "Print optimized display list (at paint time).");
print_option("relayout-event", "Print notifications when there is a relayout.");
print_option("profile-tasks", "Instrument each task, writing the output to a file.");
print_option("show-compositor-borders", "Paint borders along layer and tile boundaries.");
Expand Down Expand Up @@ -216,6 +220,7 @@ pub fn default_opts() -> Opts {
user_agent: None,
dump_flow_tree: false,
dump_display_list: false,
dump_display_list_optimized: false,
relayout_event: false,
validate_display_list_geometry: false,
profile_tasks: false,
Expand Down Expand Up @@ -379,6 +384,7 @@ pub fn from_cmdline_args(args: &[String]) -> bool {
enable_text_antialiasing: !debug_options.contains(&"disable-text-aa"),
dump_flow_tree: debug_options.contains(&"dump-flow-tree"),
dump_display_list: debug_options.contains(&"dump-display-list"),
dump_display_list_optimized: debug_options.contains(&"dump-display-list-optimized"),
relayout_event: debug_options.contains(&"relayout-event"),
validate_display_list_geometry: debug_options.contains(&"validate-display-list-geometry"),
resources_path: opt_match.opt_str("resources-path"),
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