impeller::TypefaceSTB Class Reference

#include <typeface_stb.h>

Inheritance diagram for impeller::TypefaceSTB:

Public Member Functions
	TypefaceSTB (std::unique_ptr< fml::Mapping > typeface_mapping)
	~TypefaceSTB () override
bool	IsValid () const override
std::size_t	GetHash () const override
bool	IsEqual (const Typeface &other) const override
const uint8_t *	GetTypefaceFile () const
const stbtt_fontinfo *	GetFontInfo () const
Public Member Functions inherited from impeller::Typeface
	Typeface ()
virtual	~Typeface ()
Public Member Functions inherited from impeller::Comparable< Typeface >
virtual std::size_t	GetHash () const=0

Static Public Attributes
static constexpr float	kPointsToPixels = 96.0 / 72.0

Additional Inherited Members
Static Public Member Functions inherited from impeller::BackendCast< TypefaceSTB, Typeface >
static TypefaceSTB &	Cast (Typeface &base)
static const TypefaceSTB &	Cast (const Typeface &base)
static TypefaceSTB *	Cast (Typeface *base)
static const TypefaceSTB *	Cast (const Typeface *base)

Detailed Description

Definition at line 15 of file typeface_stb.h.

Constructor & Destructor Documentation

TypefaceSTB()

impeller::TypefaceSTB::TypefaceSTB ( std::unique_ptr< fml::Mapping >  typeface_mapping )

explicit

Definition at line 14 of file typeface_stb.cc.

    : typeface_mapping_(std::move(typeface_mapping)),
      font_info_(std::make_unique<stbtt_fontinfo>()),
      is_valid_(false) {
  // We need an "offset" into the ttf file
  auto offset = stbtt_GetFontOffsetForIndex(typeface_mapping_->GetMapping(), 0);
  if (stbtt_InitFont(font_info_.get(), typeface_mapping_->GetMapping(),
                     offset) == 0) {
    FML_LOG(ERROR) << "Failed to initialize stb font from binary data.";
  } else {
    is_valid_ = true;
  }
}

~TypefaceSTB()

impeller::TypefaceSTB::~TypefaceSTB ( )

overridedefault

Member Function Documentation

GetFontInfo()

const stbtt_fontinfo * impeller::TypefaceSTB::GetFontInfo

(

)

const

Definition at line 50 of file typeface_stb.cc.

                                                     {
  return font_info_.get();
}

GetHash()

std::size_t impeller::TypefaceSTB::GetHash ( ) const

override

Definition at line 34 of file typeface_stb.cc.

                                     {
  if (!IsValid()) {
    return 0u;
  }
  return reinterpret_cast<size_t>(typeface_mapping_->GetMapping());
}

References IsValid().

Referenced by IsEqual().

GetTypefaceFile()

const uint8_t * impeller::TypefaceSTB::GetTypefaceFile

(

)

const

Definition at line 46 of file typeface_stb.cc.

                                                  {
  return typeface_mapping_->GetMapping();
}

IsEqual()

bool impeller::TypefaceSTB::IsEqual ( const Typeface &  other ) const

overridevirtual

Implements impeller::Comparable< Typeface >.

Definition at line 41 of file typeface_stb.cc.

                                                     {
  auto stb_other = reinterpret_cast<const TypefaceSTB*>(&other);
  return stb_other->GetHash() == GetHash();
}

References GetHash().

IsValid()

bool impeller::TypefaceSTB::IsValid ( ) const

overridevirtual

Implements impeller::Typeface.

Definition at line 30 of file typeface_stb.cc.

                                {
  return is_valid_;
}

Referenced by GetHash().

Member Data Documentation

kPointsToPixels

constexpr float impeller::TypefaceSTB::kPointsToPixels = 96.0 / 72.0

staticconstexpr

Definition at line 20 of file typeface_stb.h.

Referenced by impeller::CanAppendToExistingAtlas(), impeller::DrawGlyph(), impeller::MakeTextFrameSTB(), and impeller::PairsFitInAtlasOfSize().

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The documentation for this class was generated from the following files:

• impeller/typographer/backends/stb/typeface_stb.h
• impeller/typographer/backends/stb/typeface_stb.cc