#include <font_glyph_pair.h>

Classes
struct	Equal

Public Types
enum class	Tone { kDark , kLight }

using	ToneOrColor = std::variant< Tone, Color >

Static Public Member Functions
static Tone	ComputeTone (const Color &c)

Public Attributes
ToneOrColor	tone_or_color

std::optional< StrokeParameters >	stroke

Static Public Attributes
static constexpr ToneOrColor	kDarkTone {Tone::kDark}

static constexpr ToneOrColor	kLightTone {Tone::kLight}

Detailed Description

Definition at line 20 of file font_glyph_pair.h.

Member Typedef Documentation

◆ ToneOrColor

using impeller::GlyphProperties::ToneOrColor = std::variant<Tone, Color>

Definition at line 26 of file font_glyph_pair.h.

Member Enumeration Documentation

◆ Tone

enum class impeller::GlyphProperties::Tone

strong

Enumerator
kDark
kLight

Definition at line 21 of file font_glyph_pair.h.

                  {
    kDark,
    kLight,
  };

Member Function Documentation

◆ ComputeTone()

static Tone impeller::GlyphProperties::ComputeTone ( const Color & c )

inlinestatic

Definition at line 45 of file font_glyph_pair.h.

                                          {
#if FML_OS_MACOSX && !FML_OS_IOS
    // Uses BT.709 luma coefficients
    // (https://en.wikipedia.org/wiki/Rec._709#Luma_coefficients) to determine
    // whether a color is light or dark.
    Scalar luma = c.red * 0.2126f + c.green * 0.7152f + c.blue * 0.0722f;
    return (luma > 0.5f) ? Tone::kLight : Tone::kDark;
#else
    return Tone::kDark;
#endif
  }