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Remove unused glyph flags
This commit is contained in:
Matt Brubeck
parent
998bec30cf
commit
9d4f5880d3
1 changed files with 4 additions and 152 deletions
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@ -58,17 +58,7 @@ impl GlyphEntry {
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starts_ligature,
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glyph_count);
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let mut val = FLAG_NOT_MISSING;
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if !starts_cluster {
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val |= FLAG_NOT_CLUSTER_START;
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}
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if !starts_ligature {
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val |= FLAG_NOT_LIGATURE_GROUP_START;
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}
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val |= (glyph_count as u32) << GLYPH_COUNT_SHIFT;
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GlyphEntry::new(val)
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GlyphEntry::new((glyph_count as u32) << GLYPH_COUNT_SHIFT)
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}
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/// Create a GlyphEntry for the case where glyphs couldn't be found for the specified
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@ -83,42 +73,10 @@ impl GlyphEntry {
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/// The id of a particular glyph within a font
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pub type GlyphId = u32;
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// TODO: unify with bit flags?
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#[derive(PartialEq, Copy, Clone)]
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pub enum BreakType {
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None,
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Normal,
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Hyphen,
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}
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static BREAK_TYPE_NONE: u8 = 0x0;
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static BREAK_TYPE_NORMAL: u8 = 0x1;
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static BREAK_TYPE_HYPHEN: u8 = 0x2;
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fn break_flag_to_enum(flag: u8) -> BreakType {
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if (flag & BREAK_TYPE_NORMAL) != 0 {
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BreakType::Normal
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} else if (flag & BREAK_TYPE_HYPHEN) != 0 {
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BreakType::Hyphen
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} else {
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BreakType::None
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}
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}
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fn break_enum_to_flag(e: BreakType) -> u8 {
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match e {
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BreakType::None => BREAK_TYPE_NONE,
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BreakType::Normal => BREAK_TYPE_NORMAL,
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BreakType::Hyphen => BREAK_TYPE_HYPHEN,
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}
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}
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// TODO: make this more type-safe.
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static FLAG_CHAR_IS_SPACE: u32 = 0x10000000;
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// These two bits store some BREAK_TYPE_* flags
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static FLAG_CAN_BREAK_MASK: u32 = 0x60000000;
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static FLAG_CAN_BREAK_SHIFT: u32 = 29;
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static FLAG_IS_SIMPLE_GLYPH: u32 = 0x80000000;
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// glyph advance; in Au's.
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@ -132,21 +90,9 @@ static GLYPH_ID_MASK: u32 = 0x0000FFFF;
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// side array so that there is a 1:1 mapping of GlyphEntry to
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// unicode char.
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// The number of detailed glyphs for this char. If the char couldn't
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// be mapped to a glyph (!FLAG_NOT_MISSING), then this actually holds
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// the UTF8 code point instead.
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// The number of detailed glyphs for this char.
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static GLYPH_COUNT_MASK: u32 = 0x00FFFF00;
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static GLYPH_COUNT_SHIFT: u32 = 8;
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// N.B. following Gecko, these are all inverted so that a lot of
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// missing chars can be memset with zeros in one fell swoop.
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static FLAG_NOT_MISSING: u32 = 0x00000001;
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static FLAG_NOT_CLUSTER_START: u32 = 0x00000002;
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static FLAG_NOT_LIGATURE_GROUP_START: u32 = 0x00000004;
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static FLAG_CHAR_IS_TAB: u32 = 0x00000008;
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static FLAG_CHAR_IS_NEWLINE: u32 = 0x00000010;
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//static FLAG_CHAR_IS_LOW_SURROGATE: u32 = 0x00000020;
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//static CHAR_IDENTITY_FLAGS_MASK: u32 = 0x00000038;
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fn is_simple_glyph_id(id: GlyphId) -> bool {
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((id as u32) & GLYPH_ID_MASK) == id
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@ -164,7 +110,6 @@ type DetailedGlyphCount = u16;
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// Getters and setters for GlyphEntry. Setter methods are functional,
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// because GlyphEntry is immutable and only a u32 in size.
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impl GlyphEntry {
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// getter methods
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#[inline(always)]
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fn advance(&self) -> Au {
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Au(((self.value & GLYPH_ADVANCE_MASK) >> GLYPH_ADVANCE_SHIFT) as i32)
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@ -174,59 +119,17 @@ impl GlyphEntry {
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self.value & GLYPH_ID_MASK
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}
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fn is_ligature_start(&self) -> bool {
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self.has_flag(!FLAG_NOT_LIGATURE_GROUP_START)
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}
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fn is_cluster_start(&self) -> bool {
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self.has_flag(!FLAG_NOT_CLUSTER_START)
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}
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// True if original char was normal (U+0020) space. Other chars may
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// map to space glyph, but this does not account for them.
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/// True if original char was normal (U+0020) space. Other chars may
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/// map to space glyph, but this does not account for them.
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fn char_is_space(&self) -> bool {
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self.has_flag(FLAG_CHAR_IS_SPACE)
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}
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fn char_is_tab(&self) -> bool {
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!self.is_simple() && self.has_flag(FLAG_CHAR_IS_TAB)
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}
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fn char_is_newline(&self) -> bool {
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!self.is_simple() && self.has_flag(FLAG_CHAR_IS_NEWLINE)
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}
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fn can_break_before(&self) -> BreakType {
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let flag = ((self.value & FLAG_CAN_BREAK_MASK) >> FLAG_CAN_BREAK_SHIFT) as u8;
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break_flag_to_enum(flag)
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}
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// setter methods
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#[inline(always)]
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fn set_char_is_space(&self) -> GlyphEntry {
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GlyphEntry::new(self.value | FLAG_CHAR_IS_SPACE)
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}
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#[inline(always)]
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fn set_char_is_tab(&self) -> GlyphEntry {
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assert!(!self.is_simple());
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GlyphEntry::new(self.value | FLAG_CHAR_IS_TAB)
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}
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#[inline(always)]
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fn set_char_is_newline(&self) -> GlyphEntry {
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assert!(!self.is_simple());
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GlyphEntry::new(self.value | FLAG_CHAR_IS_NEWLINE)
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}
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#[inline(always)]
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fn set_can_break_before(&self, e: BreakType) -> GlyphEntry {
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let flag = (break_enum_to_flag(e) as u32) << FLAG_CAN_BREAK_SHIFT;
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GlyphEntry::new(self.value | flag)
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}
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// helper methods
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fn glyph_count(&self) -> u16 {
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assert!(!self.is_simple());
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((self.value & GLYPH_COUNT_MASK) >> GLYPH_COUNT_SHIFT) as u16
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@ -647,62 +550,11 @@ impl<'a> GlyphStore {
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.fold(Au(0), |advance, (_, glyph)| advance + glyph.advance())
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}
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// getter methods
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pub fn char_is_space(&self, i: CharIndex) -> bool {
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assert!(i < self.char_len());
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self.entry_buffer[i.to_usize()].char_is_space()
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}
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pub fn char_is_tab(&self, i: CharIndex) -> bool {
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assert!(i < self.char_len());
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self.entry_buffer[i.to_usize()].char_is_tab()
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}
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pub fn char_is_newline(&self, i: CharIndex) -> bool {
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assert!(i < self.char_len());
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self.entry_buffer[i.to_usize()].char_is_newline()
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}
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pub fn is_ligature_start(&self, i: CharIndex) -> bool {
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assert!(i < self.char_len());
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self.entry_buffer[i.to_usize()].is_ligature_start()
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}
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pub fn is_cluster_start(&self, i: CharIndex) -> bool {
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assert!(i < self.char_len());
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self.entry_buffer[i.to_usize()].is_cluster_start()
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}
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pub fn can_break_before(&self, i: CharIndex) -> BreakType {
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assert!(i < self.char_len());
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self.entry_buffer[i.to_usize()].can_break_before()
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}
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// setter methods
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pub fn set_char_is_space(&mut self, i: CharIndex) {
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assert!(i < self.char_len());
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let entry = self.entry_buffer[i.to_usize()];
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self.entry_buffer[i.to_usize()] = entry.set_char_is_space();
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}
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pub fn set_char_is_tab(&mut self, i: CharIndex) {
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assert!(i < self.char_len());
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let entry = self.entry_buffer[i.to_usize()];
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self.entry_buffer[i.to_usize()] = entry.set_char_is_tab();
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}
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pub fn set_char_is_newline(&mut self, i: CharIndex) {
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assert!(i < self.char_len());
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let entry = self.entry_buffer[i.to_usize()];
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self.entry_buffer[i.to_usize()] = entry.set_char_is_newline();
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}
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pub fn set_can_break_before(&mut self, i: CharIndex, t: BreakType) {
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assert!(i < self.char_len());
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let entry = self.entry_buffer[i.to_usize()];
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self.entry_buffer[i.to_usize()] = entry.set_can_break_before(t);
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}
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pub fn space_count_in_range(&self, range: &Range<CharIndex>) -> u32 {
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let mut spaces = 0;
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for index in range.each_index() {
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