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Convert linebox scanner and other bits to use character indices inste… 
…ad of string byte offsets. Fix some bugs in set_char_break_before, and remove dead inline tests.
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Brian J. Burg committed Nov 21, 2012
1 parent 751901d commit b2f8228
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Showing 4 changed files with 22 additions and 105 deletions.
2 changes: 1 addition & 1 deletion src/servo-gfx/font.rs
View file
Expand Up @@ -416,7 +416,7 @@ pub impl Font : FontMethods {
let azglyphs = DVec();
azglyphs.reserve(range.length());

for run.glyphs.iter_glyphs_for_byte_range(range) |_i, glyph| {
for run.glyphs.iter_glyphs_for_char_range(range) |_i, glyph| {
let glyph_advance = glyph.advance();
let glyph_offset = glyph.offset().get_default(Au::zero_point());

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31 changes: 9 additions & 22 deletions src/servo-gfx/text/glyph.rs
View file
Expand Up @@ -214,10 +214,12 @@ impl GlyphEntry {
}

// setter methods
#[inline(always)]
pure fn set_char_is_space() -> GlyphEntry {
GlyphEntry(self.value | FLAG_CHAR_IS_SPACE)
}

#[inline(always)]
pure fn set_char_is_tab() -> GlyphEntry {
assert !self.is_simple();
GlyphEntry(self.value | FLAG_CHAR_IS_TAB)
Expand All @@ -229,16 +231,10 @@ impl GlyphEntry {
GlyphEntry(self.value | FLAG_CHAR_IS_NEWLINE)
}

// returns a glyph entry only if the setting had changed.
pure fn set_can_break_before(e: BreakType) -> Option<GlyphEntry> {
let flag = break_enum_to_flag(e);
let mask = (flag as u32) << FLAG_CAN_BREAK_SHIFT;
let toggle = mask ^ (self.value & FLAG_CAN_BREAK_MASK);

match (toggle as bool) {
true => Some(GlyphEntry(self.value ^ toggle)),
false => None
}
#[inline(always)]
pure fn set_can_break_before(e: BreakType) -> GlyphEntry {
let flag = (break_enum_to_flag(e) as u32) << FLAG_CAN_BREAK_SHIFT;
GlyphEntry(self.value | flag)
}

// helper methods
Expand Down Expand Up @@ -599,12 +595,10 @@ impl GlyphStore {
}
}
}

return true;
return true;
}

pure fn iter_glyphs_for_byte_range(range: &const Range, cb: fn&(uint, GlyphInfo/&) -> bool) {
warn!("Using deprecated iter_glyphs_for_byte_range API!");
pure fn iter_glyphs_for_char_range(range: &const Range, cb: fn&(uint, GlyphInfo/&) -> bool) {
if range.begin() >= self.entry_buffer.len() {
error!("iter_glyphs_for_range: range.begin beyond length!");
return;
Expand All @@ -614,10 +608,6 @@ impl GlyphStore {
return;
}

self.iter_glyphs_for_char_range(range, cb)
}

pure fn iter_glyphs_for_char_range(range: &const Range, cb: fn&(uint, GlyphInfo/&) -> bool) {
for range.eachi |i| {
if !self.iter_glyphs_for_char_index(i, cb) { break; }
}
Expand Down Expand Up @@ -686,9 +676,6 @@ impl GlyphStore {
fn set_can_break_before(&mut self, i: uint, t: BreakType) {
assert i < self.entry_buffer.len();
let entry = self.entry_buffer[i];
match entry.set_can_break_before(t) {
Some(e) => self.entry_buffer[i] = e,
None => {}
};
self.entry_buffer[i] = entry.set_can_break_before(t);
}
}
92 changes: 11 additions & 81 deletions src/servo-gfx/text/text_run.rs
View file
Expand Up @@ -123,8 +123,6 @@ impl TextRun {
}

fn min_width_for_range(&self, range: &const Range) -> Au {
assert range.is_valid_for_string(self.text);

let mut max_piece_width = Au(0);
for self.iter_indivisible_pieces_for_range(range) |piece_range| {
let metrics = self.font.measure_text(self, piece_range);
Expand All @@ -134,8 +132,6 @@ impl TextRun {
}

fn iter_natural_lines_for_range(&self, range: &const Range, f: fn(&const Range) -> bool) {
assert range.is_valid_for_string(self.text);

let mut clump = Range::new(range.begin(), 0);
let mut in_clump = false;

Expand All @@ -147,8 +143,7 @@ impl TextRun {
(true, false) => { /* chomp whitespace */ }
(true, true) => {
in_clump = false;
// don't include the linebreak 'glyph'
// (we assume there's one GlyphEntry for a newline, and no actual glyphs)
// don't include the linebreak character itself in the clump.
if !f(&const clump) { break }
}
}
Expand All @@ -162,86 +157,21 @@ impl TextRun {
}

fn iter_indivisible_pieces_for_range(&self, range: &const Range, f: fn(&const Range) -> bool) {
assert range.is_valid_for_string(self.text);

let mut clump = Range::new(range.begin(), 0);

loop {
// find next non-whitespace byte index, then clump all whitespace before it.
match str::find_between(self.text, clump.begin(), range.end(), |c| !char::is_whitespace(c)) {
Some(nonws_char_offset) => {
clump.extend_to(nonws_char_offset);
if !f(&const clump) { break }
clump.reset(clump.end(), 0);
},
None => {
// nothing left, flush last piece containing only whitespace
if clump.end() < range.end() {
clump.extend_to(range.end());
f(&const clump);
break;
}
}
};
// extend clump to non-break-before characters.
while clump.end() < range.end()
&& self.glyphs.can_break_before(clump.end()) != BreakTypeNormal {

// find next whitespace byte index, then clump all non-whitespace before it.
match str::find_between(self.text, clump.begin(), range.end(), |c| char::is_whitespace(c)) {
Some(ws_char_offset) => {
clump.extend_to(ws_char_offset);
if !f(&const clump) { break }
clump.reset(clump.end(), 0);
}
None => {
// nothing left, flush last piece containing only non-whitespaces
if clump.end() < range.end() {
clump.extend_to(range.end());
f(&const clump);
break;
}
}
clump.extend_by(1);
}
}
}
}

// this test can't run until LayoutContext is removed as an argument
// to min_width_for_range.
/*
#[test]
fn test_calc_min_break_width() {
fn test_min_width_for_run(text: ~str, width: Au) {
let flib = FontCache();
let font = flib.get_test_font();
let run = TextRun(font, text);
run.min_width_for_range(0, text.len())
}

test_min_width_for_run(~"firecracker", au::from_px(84));
test_min_width_for_run(~"firecracker yumyum", au::from_px(84));
test_min_width_for_run(~"yumyum firecracker", au::from_px(84));
test_min_width_for_run(~"yumyum firecracker yumyum", au::from_px(84));
}
*/

/*#[test]
#[ignore]
fn test_iter_indivisible_pieces() {
fn test_pieces(text: ~str, res: ~[~str]) {
let flib = FontCache();
let font = flib.get_test_font();
let run = TextRun::new(font, copy text);
let mut slices : ~[~str] = ~[];
for run.iter_indivisible_pieces_for_range(Range(0, text.len())) |subrange| {
slices.push(str::slice(text, subrange.begin(), subrange.length()));
// now clump.end() is break-before or range.end()
if !f(&const clump) || clump.end() == range.end() { break; }

// now clump includes one break-before character, or starts from range.end()
clump.reset(clump.end(), 1);
}
assert slices == res;
}
test_pieces(~"firecracker yumyum woopwoop", ~[~"firecracker", ~" ", ~"yumyum", ~" ", ~"woopwoop"]);
test_pieces(~"firecracker yumyum ", ~[~"firecracker", ~" ", ~"yumyum", ~" "]);
test_pieces(~" firecracker yumyum", ~[~" ", ~"firecracker", ~" ", ~"yumyum"]);
test_pieces(~" ", ~[~" "]);
test_pieces(~"", ~[]);
}
*/
2 changes: 1 addition & 1 deletion src/servo/layout/box.rs
View file
Expand Up @@ -295,7 +295,7 @@ impl RenderBox : RenderBoxMethods {
let mut max_line_width: Au = Au(0);
for d.run.iter_natural_lines_for_range(&const d.range) |line_range| {
let mut line_width: Au = Au(0);
for d.run.glyphs.iter_glyphs_for_byte_range(line_range) |_char_i, glyph| {
for d.run.glyphs.iter_glyphs_for_char_range(line_range) |_char_i, glyph| {
line_width += glyph.advance()
}
max_line_width = Au::max(max_line_width, line_width);
Expand Down

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