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layout: Don't double-count padding, etc, and don't draw

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backgrounds/borders/etc. twice for inline-blocks.

Improves Reddit, GitHub, and many other sites.
This commit is contained in:
Patrick Walton 2014-09-26 20:34:22 -07:00
parent a2220f1ea4
commit fb5952fed0
4 changed files with 71 additions and 24 deletions
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79
components/layout/fragment.rs
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@ -706,6 +706,11 @@ impl Fragment {
/// Returns true if this element can be split. This is true for text fragments.
pub fn can_split(&self) -> bool {
self.is_scanned_text_fragment()
}
/// Returns true if and only if this is a scanned text fragment.
fn is_scanned_text_fragment(&self) -> bool {
match self.specific {
ScannedTextFragment(..) => true,
_ => false,
@ -990,7 +995,7 @@ impl Fragment {
debug!("Fragment::build_display_list: intersected. Adding display item...");
{
if self.is_primary_fragment() {
let level =
StackingLevel::from_background_and_border_level(background_and_border_level);
@ -1002,11 +1007,12 @@ impl Fragment {
match self.inline_context {
Some(ref inline_context) => {
for style in inline_context.styles.iter().rev() {
self.build_display_list_for_background_if_applicable(&**style,
display_list,
layout_context,
level,
&absolute_fragment_bounds);
self.build_display_list_for_background_if_applicable(
&**style,
display_list,
layout_context,
level,
&absolute_fragment_bounds);
}
}
None => {}
@ -1197,13 +1203,12 @@ impl Fragment {
}
/// Returns the intrinsic inline-sizes of this fragment.
pub fn intrinsic_inline_sizes(&mut self)
-> IntrinsicISizes {
pub fn intrinsic_inline_sizes(&mut self) -> IntrinsicISizes {
let mut result = self.style_specified_intrinsic_inline_size();
let use_border_padding = match self.specific {
GenericFragment | IframeFragment(_) | TableFragment | TableCellFragment | TableColumnFragment(_) | TableRowFragment |
TableWrapperFragment => { true }
match self.specific {
GenericFragment | IframeFragment(_) | TableFragment | TableCellFragment |
TableColumnFragment(_) | TableRowFragment | TableWrapperFragment => {}
InlineBlockFragment(ref mut info) => {
let block_flow = info.flow_ref.get_mut().as_block();
result.minimum_inline_size = max(result.minimum_inline_size,
@ -1212,13 +1217,12 @@ impl Fragment {
result.preferred_inline_size = max(result.preferred_inline_size,
block_flow.base.intrinsic_inline_sizes.preferred_inline_size +
block_flow.base.intrinsic_inline_sizes.surround_inline_size);
false
},
ImageFragment(ref mut image_fragment_info) => {
let image_inline_size = image_fragment_info.image_inline_size();
result.minimum_inline_size = max(result.minimum_inline_size, image_inline_size);
result.preferred_inline_size = max(result.preferred_inline_size, image_inline_size);
true
result.preferred_inline_size = max(result.preferred_inline_size,
image_inline_size);
}
ScannedTextFragment(ref text_fragment_info) => {
let range = &text_fragment_info.range;
@ -1226,25 +1230,33 @@ impl Fragment {
// See http://dev.w3.org/csswg/css-sizing/#max-content-inline-size.
// TODO: Account for soft wrap opportunities.
let max_line_inline_size = text_fragment_info.run.metrics_for_range(range).advance_width;
let max_line_inline_size = text_fragment_info.run
.metrics_for_range(range)
.advance_width;
result.minimum_inline_size = max(result.minimum_inline_size, min_line_inline_size);
result.preferred_inline_size = max(result.preferred_inline_size, max_line_inline_size);
true
result.minimum_inline_size = max(result.minimum_inline_size,
min_line_inline_size);
result.preferred_inline_size = max(result.preferred_inline_size,
max_line_inline_size);
}
UnscannedTextFragment(..) => {
fail!("Unscanned text fragments should have been scanned by now!")
}
UnscannedTextFragment(..) => fail!("Unscanned text fragments should have been scanned by now!"),
};
// Take borders and padding for parent inline fragments into account, if necessary.
if use_border_padding {
if self.is_primary_fragment() {
match self.inline_context {
None => {}
Some(ref context) => {
for style in context.styles.iter() {
let border_width = style.logical_border_width().inline_start_end();
let padding_inline_size = model::padding_from_style(&**style, Au(0)).inline_start_end();
result.minimum_inline_size = result.minimum_inline_size + border_width + padding_inline_size;
result.preferred_inline_size = result.preferred_inline_size + border_width + padding_inline_size;
let padding_inline_size =
model::padding_from_style(&**style, Au(0)).inline_start_end();
result.minimum_inline_size = result.minimum_inline_size + border_width +
padding_inline_size;
result.preferred_inline_size = result.preferred_inline_size +
border_width + padding_inline_size;
}
}
}
@ -1581,8 +1593,9 @@ impl Fragment {
self.border_box.size.block = self.border_box.size.block + noncontent_block_size
}
InlineBlockFragment(ref mut info) => {
// Not the primary fragment, so we do not take the noncontent size into account.
let block_flow = info.flow_ref.get_mut().as_block();
self.border_box.size.block = block_flow.base.position.size.block + noncontent_block_size;
self.border_box.size.block = block_flow.base.position.size.block;
}
_ => fail!("should have been handled above"),
}
@ -1660,6 +1673,24 @@ impl Fragment {
let ConstellationChan(ref chan) = layout_context.shared.constellation_chan;
chan.send(msg)
}
/// Returns true if and only if this is the *primary fragment* for the fragment's style object
/// (conceptually, though style sharing makes this not really true, of course). The primary
/// fragment is the one that draws backgrounds, borders, etc., and takes borders, padding and
/// margins into account. Every style object has at most one primary fragment.
///
/// At present, all fragments are primary fragments except for inline-block and table wrapper
/// fragments. Inline-block fragments are not primary fragments because the corresponding block
/// flow is the primary fragment, while table wrapper fragments are not primary fragments
/// because the corresponding table flow is the primary fragment.
fn is_primary_fragment(&self) -> bool {
match self.specific {
InlineBlockFragment(_) | TableWrapperFragment => false,
GenericFragment | IframeFragment(_) | ImageFragment(_) | ScannedTextFragment(_) |
TableFragment | TableCellFragment | TableColumnFragment(_) | TableRowFragment |
UnscannedTextFragment(_) => true,
}
}
}
impl fmt::Show for Fragment {