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Implements a DisplayList dumper.

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This patch will iterate through the DisplayList after the reflow
is done and print its elements (as also any sub-lists associated
to a child node stacking context).

It adds a new CLI parameter to trigger the function to dump the display list
to console (i.e. servo --debug dump-display-list url).

Using both display list and flow tree information is helpful to debug
rendering issues.
This commit is contained in:
Adenilson Cavalcanti 2015-02-24 17:51:23 -08:00
parent efb7f5cd91
commit b9e9d7471d
3 changed files with 59 additions and 0 deletions
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6
components/util/opts.rs
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@ -110,6 +110,9 @@ pub struct Opts {
/// Dumps the flow tree after a layout.
pub dump_flow_tree: bool,
/// Dumps the flow tree after a layout.
pub dump_display_list: bool,
/// Whether to show an error when display list geometry escapes flow overflow regions.
pub validate_display_list_geometry: bool,
@ -132,6 +135,7 @@ pub fn print_debug_usage(app: &str) {
print_option("bubble-widths", "Bubble intrinsic widths separately like other engines.");
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("profile-tasks", "Instrument each task, writing the output to a file.");
print_option("show-compositor-borders", "Paint borders along layer and tile boundaries.");
print_option("show-fragment-borders", "Paint borders along fragment boundaries.");
@ -183,6 +187,7 @@ pub fn default_opts() -> Opts {
initial_window_size: TypedSize2D(800, 600),
user_agent: None,
dump_flow_tree: false,
dump_display_list: false,
validate_display_list_geometry: false,
profile_tasks: false,
resources_path: None,
@ -330,6 +335,7 @@ pub fn from_cmdline_args(args: &[String]) -> bool {
show_debug_parallel_layout: debug_options.contains(&"show-parallel-layout"),
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"),
validate_display_list_geometry: debug_options.contains(&"validate-display-list-geometry"),
resources_path: opt_match.opt_str("resources-path"),
};