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Implements a DisplayList dumper.
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.
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@ -110,6 +110,9 @@ pub struct Opts {
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/// Dumps the flow tree after a layout.
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pub dump_flow_tree: bool,
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/// Dumps the flow tree after a layout.
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pub dump_display_list: bool,
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/// Whether to show an error when display list geometry escapes flow overflow regions.
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pub validate_display_list_geometry: bool,
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@ -132,6 +135,7 @@ pub fn print_debug_usage(app: &str) {
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print_option("bubble-widths", "Bubble intrinsic widths separately like other engines.");
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print_option("disable-text-aa", "Disable antialiasing of rendered text.");
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print_option("dump-flow-tree", "Print the flow tree after each layout.");
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print_option("dump-display-list", "Print the display list after each layout.");
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print_option("profile-tasks", "Instrument each task, writing the output to a file.");
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print_option("show-compositor-borders", "Paint borders along layer and tile boundaries.");
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print_option("show-fragment-borders", "Paint borders along fragment boundaries.");
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@ -183,6 +187,7 @@ pub fn default_opts() -> Opts {
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initial_window_size: TypedSize2D(800, 600),
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user_agent: None,
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dump_flow_tree: false,
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dump_display_list: false,
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validate_display_list_geometry: false,
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profile_tasks: false,
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resources_path: None,
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@ -330,6 +335,7 @@ pub fn from_cmdline_args(args: &[String]) -> bool {
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show_debug_parallel_layout: debug_options.contains(&"show-parallel-layout"),
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enable_text_antialiasing: !debug_options.contains(&"disable-text-aa"),
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dump_flow_tree: debug_options.contains(&"dump-flow-tree"),
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dump_display_list: debug_options.contains(&"dump-display-list"),
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validate_display_list_geometry: debug_options.contains(&"validate-display-list-geometry"),
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resources_path: opt_match.opt_str("resources-path"),
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};
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