style/color/
mod.rs

1/* This Source Code Form is subject to the terms of the Mozilla Public
2 * License, v. 2.0. If a copy of the MPL was not distributed with this
3 * file, You can obtain one at https://mozilla.org/MPL/2.0/. */
4
5//! Color support functions.
6
7/// cbindgen:ignore
8pub mod convert;
9
10mod color_function;
11pub mod component;
12pub mod gamut;
13pub mod mix;
14pub mod parsing;
15mod to_css;
16
17use self::parsing::ChannelKeyword;
18use crate::derives::*;
19pub use color_function::*;
20use component::ColorComponent;
21use cssparser::color::PredefinedColorSpace;
22
23/// Number of color-mix items to reserve on the stack to avoid heap allocations.
24pub const PRE_ALLOCATED_COLOR_MIX_ITEMS: usize = 3;
25
26/// Conveniece type to use for collecting color mix items.
27pub type ColorMixItemList<T> = smallvec::SmallVec<[T; PRE_ALLOCATED_COLOR_MIX_ITEMS]>;
28
29/// The 3 components that make up a color.  (Does not include the alpha component)
30#[derive(Copy, Clone, Debug, Deserialize, MallocSizeOf, PartialEq, Serialize, ToShmem)]
31#[repr(C)]
32pub struct ColorComponents(pub f32, pub f32, pub f32);
33
34impl ColorComponents {
35    /// Apply a function to each of the 3 components of the color.
36    #[must_use]
37    pub fn map(self, f: impl Fn(f32) -> f32) -> Self {
38        Self(f(self.0), f(self.1), f(self.2))
39    }
40
41    /// Return the components as an array
42    #[inline]
43    pub fn to_array(&self) -> [f32; 3] {
44        [self.0, self.1, self.2]
45    }
46}
47
48impl std::ops::Add for ColorComponents {
49    type Output = Self;
50
51    fn add(self, rhs: Self) -> Self::Output {
52        Self(self.0 + rhs.0, self.1 + rhs.1, self.2 + rhs.2)
53    }
54}
55
56impl std::ops::Sub for ColorComponents {
57    type Output = Self;
58
59    fn sub(self, rhs: Self) -> Self::Output {
60        Self(self.0 - rhs.0, self.1 - rhs.1, self.2 - rhs.2)
61    }
62}
63
64impl std::ops::Mul for ColorComponents {
65    type Output = Self;
66
67    fn mul(self, rhs: Self) -> Self::Output {
68        Self(self.0 * rhs.0, self.1 * rhs.1, self.2 * rhs.2)
69    }
70}
71
72impl std::ops::Div for ColorComponents {
73    type Output = Self;
74
75    fn div(self, rhs: Self) -> Self::Output {
76        Self(self.0 / rhs.0, self.1 / rhs.1, self.2 / rhs.2)
77    }
78}
79
80/// A color space representation in the CSS specification.
81///
82/// https://drafts.csswg.org/css-color-4/#typedef-color-space
83#[derive(
84    Clone,
85    Copy,
86    Debug,
87    Deserialize,
88    Eq,
89    MallocSizeOf,
90    Parse,
91    PartialEq,
92    Serialize,
93    ToAnimatedValue,
94    ToComputedValue,
95    ToCss,
96    ToResolvedValue,
97    ToShmem,
98)]
99#[repr(u8)]
100pub enum ColorSpace {
101    /// A color specified in the sRGB color space with either the rgb/rgba(..)
102    /// functions or the newer color(srgb ..) function. If the color(..)
103    /// function is used, the AS_COLOR_FUNCTION flag will be set. Examples:
104    /// "color(srgb 0.691 0.139 0.259)", "rgb(176, 35, 66)"
105    Srgb = 0,
106    /// A color specified in the Hsl notation in the sRGB color space, e.g.
107    /// "hsl(289.18 93.136% 65.531%)"
108    /// https://drafts.csswg.org/css-color-4/#the-hsl-notation
109    Hsl,
110    /// A color specified in the Hwb notation in the sRGB color space, e.g.
111    /// "hwb(740deg 20% 30%)"
112    /// https://drafts.csswg.org/css-color-4/#the-hwb-notation
113    Hwb,
114    /// A color specified in the Lab color format, e.g.
115    /// "lab(29.2345% 39.3825 20.0664)".
116    /// https://w3c.github.io/csswg-drafts/css-color-4/#lab-colors
117    Lab,
118    /// A color specified in the Lch color format, e.g.
119    /// "lch(29.2345% 44.2 27)".
120    /// https://w3c.github.io/csswg-drafts/css-color-4/#lch-colors
121    Lch,
122    /// A color specified in the Oklab color format, e.g.
123    /// "oklab(40.101% 0.1147 0.0453)".
124    /// https://w3c.github.io/csswg-drafts/css-color-4/#lab-colors
125    Oklab,
126    /// A color specified in the Oklch color format, e.g.
127    /// "oklch(40.101% 0.12332 21.555)".
128    /// https://w3c.github.io/csswg-drafts/css-color-4/#lch-colors
129    Oklch,
130    /// A color specified with the color(..) function and the "srgb-linear"
131    /// color space, e.g. "color(srgb-linear 0.435 0.017 0.055)".
132    SrgbLinear,
133    /// A color specified with the color(..) function and the "display-p3"
134    /// color space, e.g. "color(display-p3 0.84 0.19 0.72)".
135    DisplayP3,
136    /// A color specified with the color(..) function and the "display-p3-linear"
137    /// color space.
138    DisplayP3Linear,
139    /// A color specified with the color(..) function and the "a98-rgb" color
140    /// space, e.g. "color(a98-rgb 0.44091 0.49971 0.37408)".
141    A98Rgb,
142    /// A color specified with the color(..) function and the "prophoto-rgb"
143    /// color space, e.g. "color(prophoto-rgb 0.36589 0.41717 0.31333)".
144    ProphotoRgb,
145    /// A color specified with the color(..) function and the "rec2020" color
146    /// space, e.g. "color(rec2020 0.42210 0.47580 0.35605)".
147    Rec2020,
148    /// A color specified with the color(..) function and the "xyz-d50" color
149    /// space, e.g. "color(xyz-d50 0.2005 0.14089 0.4472)".
150    XyzD50,
151    /// A color specified with the color(..) function and the "xyz-d65" or "xyz"
152    /// color space, e.g. "color(xyz-d65 0.21661 0.14602 0.59452)".
153    /// NOTE: https://drafts.csswg.org/css-color-4/#resolving-color-function-values
154    ///       specifies that `xyz` is an alias for the `xyz-d65` color space.
155    #[parse(aliases = "xyz")]
156    XyzD65,
157}
158
159impl ColorSpace {
160    /// Returns whether this is a `<rectangular-color-space>`.
161    #[inline]
162    pub fn is_rectangular(&self) -> bool {
163        !self.is_polar()
164    }
165
166    /// Returns whether this is a `<polar-color-space>`.
167    #[inline]
168    pub fn is_polar(&self) -> bool {
169        matches!(self, Self::Hsl | Self::Hwb | Self::Lch | Self::Oklch)
170    }
171
172    /// Returns true if the color has RGB or XYZ components.
173    #[inline]
174    pub fn is_rgb_or_xyz_like(&self) -> bool {
175        match self {
176            Self::Srgb
177            | Self::SrgbLinear
178            | Self::DisplayP3
179            | Self::DisplayP3Linear
180            | Self::A98Rgb
181            | Self::ProphotoRgb
182            | Self::Rec2020
183            | Self::XyzD50
184            | Self::XyzD65 => true,
185            _ => false,
186        }
187    }
188
189    /// Returns an index of the hue component in the color space, otherwise
190    /// `None`.
191    #[inline]
192    pub fn hue_index(&self) -> Option<usize> {
193        match self {
194            Self::Hsl | Self::Hwb => Some(0),
195            Self::Lch | Self::Oklch => Some(2),
196
197            _ => {
198                debug_assert!(!self.is_polar());
199                None
200            },
201        }
202    }
203
204    /// Returns the corresponding linear version of this color space if
205    /// one exists, else returns `None`.
206    /// Linear color spaces return themselves; this includes XYZ.
207    /// Perceptual/non-RGB color spaces return None.
208    #[inline]
209    pub fn get_linear_color_space(self) -> Option<Self> {
210        match self {
211            Self::Srgb | Self::Hsl | Self::Hwb => Some(Self::SrgbLinear),
212            Self::DisplayP3 => Some(Self::DisplayP3Linear),
213            Self::SrgbLinear | Self::DisplayP3Linear | Self::XyzD50 | Self::XyzD65 => Some(self),
214            // We currently don't have the linear versions of these wide RGB spaces
215            // implemented, so returning `None`` for the time being. Grouping them
216            // separately here as a nod to future work.
217            Self::A98Rgb | Self::ProphotoRgb | Self::Rec2020 => None,
218            Self::Lab | Self::Lch | Self::Oklab | Self::Oklch => None,
219        }
220    }
221}
222
223/// Flags used when serializing colors.
224#[derive(Clone, Copy, Debug, Default, MallocSizeOf, PartialEq, ToShmem)]
225#[cfg_attr(feature = "serde", derive(Deserialize, Serialize))]
226#[repr(C)]
227pub struct ColorFlags(u8);
228bitflags! {
229    impl ColorFlags : u8 {
230        /// Whether the 1st color component is `none`.
231        const C0_IS_NONE = 1 << 0;
232        /// Whether the 2nd color component is `none`.
233        const C1_IS_NONE = 1 << 1;
234        /// Whether the 3rd color component is `none`.
235        const C2_IS_NONE = 1 << 2;
236        /// Whether the alpha component is `none`.
237        const ALPHA_IS_NONE = 1 << 3;
238        /// Whether any color or alpha component is `none`.
239        const NONE_FLAGS = Self::C0_IS_NONE.0 | Self::C1_IS_NONE.0 | Self::C2_IS_NONE.0 | Self::ALPHA_IS_NONE.0;
240        /// Marks that this color is in the legacy color format. This flag is
241        /// only valid for the `Srgb` color space.
242        const IS_LEGACY_SRGB = 1 << 4;
243    }
244}
245
246/// An absolutely specified color, using either rgb(), rgba(), lab(), lch(),
247/// oklab(), oklch() or color().
248#[derive(Copy, Clone, Debug, Deserialize, MallocSizeOf, Serialize, ToShmem, ToTyped)]
249#[repr(C)]
250#[typed(todo_derive_fields)]
251pub struct AbsoluteColor {
252    /// The 3 components that make up colors in any color space.
253    pub components: ColorComponents,
254    /// The alpha component of the color.
255    pub alpha: f32,
256    /// The current color space that the components represent.
257    pub color_space: ColorSpace,
258    /// Extra flags used during serialization of this color.
259    pub flags: ColorFlags,
260}
261
262impl PartialEq for AbsoluteColor {
263    // See https://github.com/w3c/csswg-drafts/issues/13157#issuecomment-4165667681
264    fn eq(&self, other: &Self) -> bool {
265        // If both colors have the same color-space, just compare components; note that
266        // any `none` components only match `none` in the other color.
267        if self.color_space == other.color_space {
268            return self.components == other.components
269                && self.alpha == other.alpha
270                && (self.flags & ColorFlags::NONE_FLAGS) == (other.flags & ColorFlags::NONE_FLAGS);
271        }
272        // Otherwise, if any `none` components are present in either color, return false.
273        if self
274            .flags
275            .union(other.flags)
276            .intersects(ColorFlags::NONE_FLAGS)
277        {
278            return false;
279        }
280        // Otherwise, convert both colors to Oklab for comparison, and allow EPSILON
281        // difference in component values.
282        // TODO: check value of EPSILON once the spec is updated to cover this.
283        const EPSILON: f32 = 0.0001;
284        let a = self.to_color_space(ColorSpace::Oklab);
285        let b = other.to_color_space(ColorSpace::Oklab);
286        (a.components.0 - b.components.0).abs() <= EPSILON
287            && (a.components.1 - b.components.1).abs() <= EPSILON
288            && (a.components.2 - b.components.2).abs() <= EPSILON
289            && (a.alpha - b.alpha).abs() <= EPSILON
290    }
291}
292
293/// Given an [`AbsoluteColor`], return the 4 float components as the type given,
294/// e.g.:
295///
296/// ```rust
297/// let srgb = AbsoluteColor::new(ColorSpace::Srgb, 1.0, 0.0, 0.0, 0.0);
298/// let floats = color_components_as!(&srgb, [f32; 4]); // [1.0, 0.0, 0.0, 0.0]
299/// ```
300macro_rules! color_components_as {
301    ($c:expr, $t:ty) => {{
302        // This macro is not an inline function, because we can't use the
303        // generic  type ($t) in a constant expression as per:
304        // https://github.com/rust-lang/rust/issues/76560
305        const_assert_eq!(std::mem::size_of::<$t>(), std::mem::size_of::<[f32; 4]>());
306        const_assert_eq!(std::mem::align_of::<$t>(), std::mem::align_of::<[f32; 4]>());
307        const_assert!(std::mem::size_of::<AbsoluteColor>() >= std::mem::size_of::<$t>());
308        const_assert_eq!(
309            std::mem::align_of::<AbsoluteColor>(),
310            std::mem::align_of::<$t>()
311        );
312
313        std::mem::transmute::<&ColorComponents, &$t>(&$c.components)
314    }};
315}
316
317/// Holds details about each component passed into creating a new [`AbsoluteColor`].
318pub struct ComponentDetails {
319    value: f32,
320    is_none: bool,
321}
322
323impl From<f32> for ComponentDetails {
324    fn from(value: f32) -> Self {
325        Self {
326            value,
327            is_none: false,
328        }
329    }
330}
331
332impl From<u8> for ComponentDetails {
333    fn from(value: u8) -> Self {
334        Self {
335            value: value as f32 / 255.0,
336            is_none: false,
337        }
338    }
339}
340
341impl From<Option<f32>> for ComponentDetails {
342    fn from(value: Option<f32>) -> Self {
343        if let Some(value) = value {
344            Self {
345                value,
346                is_none: false,
347            }
348        } else {
349            Self {
350                value: 0.0,
351                is_none: true,
352            }
353        }
354    }
355}
356
357impl From<ColorComponent<f32>> for ComponentDetails {
358    fn from(value: ColorComponent<f32>) -> Self {
359        if let ColorComponent::Value(value) = value {
360            Self {
361                value,
362                is_none: false,
363            }
364        } else {
365            Self {
366                value: 0.0,
367                is_none: true,
368            }
369        }
370    }
371}
372
373impl AbsoluteColor {
374    /// A fully transparent color in the legacy syntax.
375    pub const TRANSPARENT_BLACK: Self = Self {
376        components: ColorComponents(0.0, 0.0, 0.0),
377        alpha: 0.0,
378        color_space: ColorSpace::Srgb,
379        flags: ColorFlags::IS_LEGACY_SRGB,
380    };
381
382    /// An opaque black color in the legacy syntax.
383    pub const BLACK: Self = Self {
384        components: ColorComponents(0.0, 0.0, 0.0),
385        alpha: 1.0,
386        color_space: ColorSpace::Srgb,
387        flags: ColorFlags::IS_LEGACY_SRGB,
388    };
389
390    /// An opaque white color in the legacy syntax.
391    pub const WHITE: Self = Self {
392        components: ColorComponents(1.0, 1.0, 1.0),
393        alpha: 1.0,
394        color_space: ColorSpace::Srgb,
395        flags: ColorFlags::IS_LEGACY_SRGB,
396    };
397
398    /// Create a new [`AbsoluteColor`] with the given [`ColorSpace`] and
399    /// components.
400    pub fn new(
401        color_space: ColorSpace,
402        c1: impl Into<ComponentDetails>,
403        c2: impl Into<ComponentDetails>,
404        c3: impl Into<ComponentDetails>,
405        alpha: impl Into<ComponentDetails>,
406    ) -> Self {
407        let mut flags = ColorFlags::empty();
408
409        macro_rules! cd {
410            ($c:expr,$flag:expr) => {{
411                let component_details = $c.into();
412                if component_details.is_none {
413                    flags |= $flag;
414                }
415                component_details.value
416            }};
417        }
418
419        let mut components = ColorComponents(
420            cd!(c1, ColorFlags::C0_IS_NONE),
421            cd!(c2, ColorFlags::C1_IS_NONE),
422            cd!(c3, ColorFlags::C2_IS_NONE),
423        );
424
425        let alpha = cd!(alpha, ColorFlags::ALPHA_IS_NONE);
426
427        // Lightness for Lab and Lch is clamped to [0..100].
428        if matches!(color_space, ColorSpace::Lab | ColorSpace::Lch) {
429            components.0 = components.0.clamp(0.0, 100.0);
430        }
431
432        // Lightness for Oklab and Oklch is clamped to [0..1].
433        if matches!(color_space, ColorSpace::Oklab | ColorSpace::Oklch) {
434            components.0 = components.0.clamp(0.0, 1.0);
435        }
436
437        // Chroma must not be less than 0.
438        if matches!(color_space, ColorSpace::Lch | ColorSpace::Oklch) {
439            components.1 = components.1.max(0.0);
440        }
441
442        // Alpha is always clamped to [0..1].
443        let alpha = alpha.clamp(0.0, 1.0);
444
445        Self {
446            components,
447            alpha,
448            color_space,
449            flags,
450        }
451    }
452
453    /// Returns a copy of this color with a modified alpha value.
454    pub fn with_alpha(&self, alpha: impl Into<ComponentDetails>) -> Self {
455        let mut result = *self;
456        let alpha_details = alpha.into();
457        result.alpha = alpha_details.value;
458        result
459            .flags
460            .set(ColorFlags::ALPHA_IS_NONE, alpha_details.is_none);
461        result.flags.remove(ColorFlags::IS_LEGACY_SRGB);
462        result
463    }
464
465    /// Convert this color into the sRGB color space and set it to the legacy
466    /// syntax.
467    #[inline]
468    #[must_use]
469    pub fn into_srgb_legacy(self) -> Self {
470        let mut result = if !matches!(self.color_space, ColorSpace::Srgb) {
471            self.to_color_space(ColorSpace::Srgb)
472        } else {
473            self
474        };
475
476        // Explicitly set the flags to IS_LEGACY_SRGB only to clear out the
477        // *_IS_NONE flags, because the legacy syntax doesn't allow "none".
478        result.flags = ColorFlags::IS_LEGACY_SRGB;
479
480        result
481    }
482
483    /// Create a new [`AbsoluteColor`] from rgba legacy syntax values in the sRGB color space.
484    pub fn srgb_legacy(red: u8, green: u8, blue: u8, alpha: f32) -> Self {
485        let mut result = Self::new(ColorSpace::Srgb, red, green, blue, alpha);
486        result.flags = ColorFlags::IS_LEGACY_SRGB;
487        result
488    }
489
490    /// Return all the components of the color in an array.  (Includes alpha)
491    #[inline]
492    pub fn raw_components(&self) -> &[f32; 4] {
493        unsafe { color_components_as!(self, [f32; 4]) }
494    }
495
496    /// Returns true if this color is in the legacy color syntax.
497    #[inline]
498    pub fn is_legacy_syntax(&self) -> bool {
499        // rgb(), rgba(), hsl(), hsla(), hwb(), hwba()
500        match self.color_space {
501            ColorSpace::Srgb => self.flags.contains(ColorFlags::IS_LEGACY_SRGB),
502            ColorSpace::Hsl | ColorSpace::Hwb => true,
503            _ => false,
504        }
505    }
506
507    /// Returns true if this color is fully transparent.
508    #[inline]
509    pub fn is_transparent(&self) -> bool {
510        self.flags.contains(ColorFlags::ALPHA_IS_NONE) || self.alpha == 0.0
511    }
512
513    /// Return an optional first component.
514    #[inline]
515    pub fn c0(&self) -> Option<f32> {
516        if self.flags.contains(ColorFlags::C0_IS_NONE) {
517            None
518        } else {
519            Some(self.components.0)
520        }
521    }
522
523    /// Return an optional second component.
524    #[inline]
525    pub fn c1(&self) -> Option<f32> {
526        if self.flags.contains(ColorFlags::C1_IS_NONE) {
527            None
528        } else {
529            Some(self.components.1)
530        }
531    }
532
533    /// Return an optional second component.
534    #[inline]
535    pub fn c2(&self) -> Option<f32> {
536        if self.flags.contains(ColorFlags::C2_IS_NONE) {
537            None
538        } else {
539            Some(self.components.2)
540        }
541    }
542
543    /// Return an optional alpha component.
544    #[inline]
545    pub fn alpha(&self) -> Option<f32> {
546        if self.flags.contains(ColorFlags::ALPHA_IS_NONE) {
547            None
548        } else {
549            Some(self.alpha)
550        }
551    }
552
553    /// Return the value of a component by its channel keyword.
554    pub fn get_component_by_channel_keyword(
555        &self,
556        channel_keyword: ChannelKeyword,
557    ) -> Result<Option<f32>, ()> {
558        if channel_keyword == ChannelKeyword::ALPHA {
559            return Ok(self.alpha());
560        }
561
562        Ok(match self.color_space {
563            ColorSpace::Srgb => {
564                if self.flags.contains(ColorFlags::IS_LEGACY_SRGB) {
565                    match channel_keyword {
566                        ChannelKeyword::R => self.c0().map(|v| v * 255.0),
567                        ChannelKeyword::G => self.c1().map(|v| v * 255.0),
568                        ChannelKeyword::B => self.c2().map(|v| v * 255.0),
569                        _ => return Err(()),
570                    }
571                } else {
572                    match channel_keyword {
573                        ChannelKeyword::R => self.c0(),
574                        ChannelKeyword::G => self.c1(),
575                        ChannelKeyword::B => self.c2(),
576                        _ => return Err(()),
577                    }
578                }
579            },
580            ColorSpace::Hsl => match channel_keyword {
581                ChannelKeyword::H => self.c0(),
582                ChannelKeyword::S => self.c1(),
583                ChannelKeyword::L => self.c2(),
584                _ => return Err(()),
585            },
586            ColorSpace::Hwb => match channel_keyword {
587                ChannelKeyword::H => self.c0(),
588                ChannelKeyword::W => self.c1(),
589                ChannelKeyword::B => self.c2(),
590                _ => return Err(()),
591            },
592            ColorSpace::Lab | ColorSpace::Oklab => match channel_keyword {
593                ChannelKeyword::L => self.c0(),
594                ChannelKeyword::A => self.c1(),
595                ChannelKeyword::B => self.c2(),
596                _ => return Err(()),
597            },
598            ColorSpace::Lch | ColorSpace::Oklch => match channel_keyword {
599                ChannelKeyword::L => self.c0(),
600                ChannelKeyword::C => self.c1(),
601                ChannelKeyword::H => self.c2(),
602                _ => return Err(()),
603            },
604            ColorSpace::SrgbLinear
605            | ColorSpace::DisplayP3
606            | ColorSpace::DisplayP3Linear
607            | ColorSpace::A98Rgb
608            | ColorSpace::ProphotoRgb
609            | ColorSpace::Rec2020 => match channel_keyword {
610                ChannelKeyword::R => self.c0(),
611                ChannelKeyword::G => self.c1(),
612                ChannelKeyword::B => self.c2(),
613                _ => return Err(()),
614            },
615            ColorSpace::XyzD50 | ColorSpace::XyzD65 => match channel_keyword {
616                ChannelKeyword::X => self.c0(),
617                ChannelKeyword::Y => self.c1(),
618                ChannelKeyword::Z => self.c2(),
619                _ => return Err(()),
620            },
621        })
622    }
623
624    /// Convert this color to the specified color space.
625    pub fn to_color_space(&self, color_space: ColorSpace) -> Self {
626        use ColorSpace::*;
627
628        if self.color_space == color_space {
629            return *self;
630        }
631
632        // Missing components are treated as 0 for the conversion math.
633        // Carry-forward of `none` to analogous channels is handled at call
634        // sites where needed.
635        macro_rules! missing_to_zero {
636            ($c:expr) => {{ crate::values::normalize($c.unwrap_or(0.0)) }};
637        }
638
639        let components = ColorComponents(
640            missing_to_zero!(self.c0()),
641            missing_to_zero!(self.c1()),
642            missing_to_zero!(self.c2()),
643        );
644
645        let result = match (self.color_space, color_space) {
646            // We have simplified conversions that do not need to convert to XYZ
647            // first. This improves performance, because it skips at least 2
648            // matrix multiplications and reduces float rounding errors.
649            (Srgb, Hsl) => convert::rgb_to_hsl(&components),
650            (Srgb, Hwb) => convert::rgb_to_hwb(&components),
651            (Hsl, Srgb) => convert::hsl_to_rgb(&components),
652            (Hwb, Srgb) => convert::hwb_to_rgb(&components),
653            (Lab, Lch) | (Oklab, Oklch) => convert::orthogonal_to_polar(
654                &components,
655                convert::epsilon_for_range(0.0, if color_space == Lch { 100.0 } else { 1.0 }),
656            ),
657            (Lch, Lab) | (Oklch, Oklab) => convert::polar_to_orthogonal(&components),
658
659            // All other conversions need to convert to XYZ first.
660            _ => {
661                let (xyz, white_point) = match self.color_space {
662                    Lab => convert::to_xyz::<convert::Lab>(&components),
663                    Lch => convert::to_xyz::<convert::Lch>(&components),
664                    Oklab => convert::to_xyz::<convert::Oklab>(&components),
665                    Oklch => convert::to_xyz::<convert::Oklch>(&components),
666                    Srgb => convert::to_xyz::<convert::Srgb>(&components),
667                    Hsl => convert::to_xyz::<convert::Hsl>(&components),
668                    Hwb => convert::to_xyz::<convert::Hwb>(&components),
669                    SrgbLinear => convert::to_xyz::<convert::SrgbLinear>(&components),
670                    DisplayP3 => convert::to_xyz::<convert::DisplayP3>(&components),
671                    DisplayP3Linear => convert::to_xyz::<convert::DisplayP3Linear>(&components),
672                    A98Rgb => convert::to_xyz::<convert::A98Rgb>(&components),
673                    ProphotoRgb => convert::to_xyz::<convert::ProphotoRgb>(&components),
674                    Rec2020 => convert::to_xyz::<convert::Rec2020>(&components),
675                    XyzD50 => convert::to_xyz::<convert::XyzD50>(&components),
676                    XyzD65 => convert::to_xyz::<convert::XyzD65>(&components),
677                };
678
679                match color_space {
680                    Lab => convert::from_xyz::<convert::Lab>(&xyz, white_point),
681                    Lch => convert::from_xyz::<convert::Lch>(&xyz, white_point),
682                    Oklab => convert::from_xyz::<convert::Oklab>(&xyz, white_point),
683                    Oklch => convert::from_xyz::<convert::Oklch>(&xyz, white_point),
684                    Srgb => convert::from_xyz::<convert::Srgb>(&xyz, white_point),
685                    Hsl => convert::from_xyz::<convert::Hsl>(&xyz, white_point),
686                    Hwb => convert::from_xyz::<convert::Hwb>(&xyz, white_point),
687                    SrgbLinear => convert::from_xyz::<convert::SrgbLinear>(&xyz, white_point),
688                    DisplayP3 => convert::from_xyz::<convert::DisplayP3>(&xyz, white_point),
689                    DisplayP3Linear => {
690                        convert::from_xyz::<convert::DisplayP3Linear>(&xyz, white_point)
691                    },
692                    A98Rgb => convert::from_xyz::<convert::A98Rgb>(&xyz, white_point),
693                    ProphotoRgb => convert::from_xyz::<convert::ProphotoRgb>(&xyz, white_point),
694                    Rec2020 => convert::from_xyz::<convert::Rec2020>(&xyz, white_point),
695                    XyzD50 => convert::from_xyz::<convert::XyzD50>(&xyz, white_point),
696                    XyzD65 => convert::from_xyz::<convert::XyzD65>(&xyz, white_point),
697                }
698            },
699        };
700
701        // A NAN value coming from a conversion function means the the component
702        // is missing, so we convert it to None.
703        macro_rules! nan_to_missing {
704            ($v:expr) => {{ if $v.is_nan() { None } else { Some($v) } }};
705        }
706
707        Self::new(
708            color_space,
709            nan_to_missing!(result.0),
710            nan_to_missing!(result.1),
711            nan_to_missing!(result.2),
712            self.alpha(),
713        )
714    }
715
716    /// Convert a given `nscolor` to a Servo AbsoluteColor value.
717    pub fn from_nscolor(color: u32) -> Self {
718        let [r, g, b, a] = color.to_le_bytes();
719        Self::srgb_legacy(r, g, b, a as f32 / 255.0)
720    }
721}
722
723#[test]
724fn from_nscolor_should_be_in_legacy_syntax() {
725    let result = AbsoluteColor::from_nscolor(0x336699CC);
726    assert!(result.flags.contains(ColorFlags::IS_LEGACY_SRGB));
727    assert!(result.is_legacy_syntax());
728}
729
730impl From<PredefinedColorSpace> for ColorSpace {
731    fn from(value: PredefinedColorSpace) -> Self {
732        match value {
733            PredefinedColorSpace::Srgb => ColorSpace::Srgb,
734            PredefinedColorSpace::SrgbLinear => ColorSpace::SrgbLinear,
735            PredefinedColorSpace::DisplayP3 => ColorSpace::DisplayP3,
736            PredefinedColorSpace::DisplayP3Linear => ColorSpace::DisplayP3Linear,
737            PredefinedColorSpace::A98Rgb => ColorSpace::A98Rgb,
738            PredefinedColorSpace::ProphotoRgb => ColorSpace::ProphotoRgb,
739            PredefinedColorSpace::Rec2020 => ColorSpace::Rec2020,
740            PredefinedColorSpace::XyzD50 => ColorSpace::XyzD50,
741            PredefinedColorSpace::XyzD65 => ColorSpace::XyzD65,
742        }
743    }
744}
style/color/mod.rs

style/color/
mod.rs
