1
  2
  3
  4
  5
  6
  7
  8
  9
 10
 11
 12
 13
 14
 15
 16
 17
 18
 19
 20
 21
 22
 23
 24
 25
 26
 27
 28
 29
 30
 31
 32
 33
 34
 35
 36
 37
 38
 39
 40
 41
 42
 43
 44
 45
 46
 47
 48
 49
 50
 51
 52
 53
 54
 55
 56
 57
 58
 59
 60
 61
 62
 63
 64
 65
 66
 67
 68
 69
 70
 71
 72
 73
 74
 75
 76
 77
 78
 79
 80
 81
 82
 83
 84
 85
 86
 87
 88
 89
 90
 91
 92
 93
 94
 95
 96
 97
 98
 99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161

//! Collections of colors for layered outlines.

use super::internal::*;
use super::{
    string::{LocalizedString, StringId},
    FontRef,
};

const CPAL: RawTag = raw_tag(b"CPAL");

/// Iterator over a collection of color palettes.
#[derive(Copy, Clone)]
pub struct ColorPalettes<'a> {
    font: FontRef<'a>,
    data: Bytes<'a>,
    len: usize,
    pos: usize,
}

impl<'a> ColorPalettes<'a> {
    pub(crate) fn new(font: FontRef<'a>, data: &'a [u8]) -> Self {
        let data = Bytes::new(data);
        let len = data.read_or_default::<u16>(4) as usize;
        Self {
            font,
            data,
            len,
            pos: 0,
        }
    }

    pub(crate) fn from_font(font: &FontRef<'a>) -> Self {
        let data = font.table_data(CPAL).unwrap_or(&[]);
        Self::new(*font, data)
    }

    pub(crate) fn from_font_and_offset(font: &FontRef<'a>, offset: u32) -> Self {
        let data = font.data.get(offset as usize..).unwrap_or(&[]);
        Self::new(*font, data)
    }

    fn get(&self, index: usize) -> Option<ColorPalette<'a>> {
        if index >= self.len {
            return None;
        }
        let b = &self.data;
        let version = b.read::<u16>(0)?;
        let num_entries = b.read::<u16>(2)?;
        let offset = b.read::<u32>(8)? as usize;
        let first = b.read::<u16>(12 + index as usize * 2)? as usize;
        let offset = offset + first * 4;
        Some(ColorPalette {
            font: self.font,
            data: *b,
            version,
            index,
            num_entries,
            offset,
        })
    }
}

impl_iter!(ColorPalettes, ColorPalette);

/// Collection of colors.
#[derive(Copy, Clone)]
pub struct ColorPalette<'a> {
    font: FontRef<'a>,
    data: Bytes<'a>,
    version: u16,
    index: usize,
    num_entries: u16,
    offset: usize,
}

impl<'a> ColorPalette<'a> {
    /// Returns the index of the palette.
    pub fn index(&self) -> u16 {
        self.index as u16
    }

    /// Returns the name identifier for the palette, if available.
    pub fn name_id(&self) -> Option<StringId> {
        if self.version == 0 {
            return None;
        }
        let d = &self.data;
        let num_palettes = d.read::<u16>(4)? as usize;
        let base = 16 + num_palettes * 2;
        let labels_offset = d.read::<u32>(base)? as usize;
        if labels_offset == 0 {
            return None;
        }
        Some(StringId::Other(
            d.read::<u16>(labels_offset + self.index as usize * 2)?,
        ))
    }

    /// Returns the name for the palette, optionally for a particular
    /// language.
    pub fn name(&self, language: Option<&str>) -> Option<LocalizedString<'a>> {
        self.name_id()
            .map(|id| self.font.localized_strings().find_by_id(id, language))
            .flatten()
    }

    /// Returns the theme usability of the palette, if available.
    pub fn usability(&self) -> Option<Usability> {
        let flags = self.flags()?;
        Some(match flags & 0b11 {
            0b01 => Usability::Light,
            0b10 => Usability::Dark,
            0b11 => Usability::Both,
            _ => return None,
        })
    }

    /// Returns the number of color entries in the palette.
    pub fn len(&self) -> u16 {
        self.num_entries
    }

    /// Returns the color for the specified entry in RGBA order.
    pub fn get(&self, index: u16) -> [u8; 4] {
        if index >= self.num_entries {
            return [0; 4];
        }
        let offset = self.offset + index as usize * 4;
        let d = &self.data;
        let b = d.read_or_default::<u8>(offset);
        let g = d.read_or_default::<u8>(offset + 1);
        let r = d.read_or_default::<u8>(offset + 2);
        let a = d.read_or_default::<u8>(offset + 3);
        [r, g, b, a]
    }

    fn flags(&self) -> Option<u32> {
        if self.version == 0 {
            return None;
        }
        let d = &self.data;
        let num_palettes = d.read::<u16>(4)? as usize;
        let base = 12 + num_palettes * 2;
        let types_offset = d.read::<u32>(base)? as usize;
        if types_offset == 0 {
            return None;
        }
        d.read::<u32>(types_offset + self.index as usize * 4)
    }
}

/// Theme of a palette with respect to background color.
#[derive(Copy, Clone, PartialEq, Eq, Debug)]
pub enum Usability {
    /// Usable with light backgrounds.
    Light,
    /// Usable with dark backgrounds.
    Dark,
    /// Usable with both light and dark backgrounds.
    Both,
}