impeller::LazyGlyphAtlas Class Reference

#include <lazy_glyph_atlas.h>

Public Member Functions
	LazyGlyphAtlas (std::shared_ptr< TypographerContext > typographer_context)
	~LazyGlyphAtlas ()
void	AddTextFrame (const std::shared_ptr< TextFrame > &frame, Point position, const Matrix &transform, const std::optional< GlyphProperties > &properties)
void	ResetTextFrames ()
const std::shared_ptr< GlyphAtlas > &	CreateOrGetGlyphAtlas (Context &context, HostBuffer &host_buffer, GlyphAtlas::Type type)

Detailed Description

Definition at line 16 of file lazy_glyph_atlas.h.

Constructor & Destructor Documentation

LazyGlyphAtlas()

impeller::LazyGlyphAtlas::LazyGlyphAtlas ( std::shared_ptr< TypographerContext >  typographer_context )

explicit

Definition at line 20 of file lazy_glyph_atlas.cc.

    : typographer_context_(std::move(typographer_context)),
      alpha_data_(typographer_context_
                      ? typographer_context_->CreateGlyphAtlasContext(
                            GlyphAtlas::Type::kAlphaBitmap)
                      : nullptr),
      color_data_(typographer_context_
                      ? typographer_context_->CreateGlyphAtlasContext(
                            GlyphAtlas::Type::kColorBitmap)
                      : nullptr) {}

~LazyGlyphAtlas()

impeller::LazyGlyphAtlas::~LazyGlyphAtlas ( )

default

Member Function Documentation

AddTextFrame()

void impeller::LazyGlyphAtlas::AddTextFrame	(	const std::shared_ptr< TextFrame > &	frame,
		Point	position,
		const Matrix &	transform,
		const std::optional< GlyphProperties > &	properties
	)

Definition at line 34 of file lazy_glyph_atlas.cc.

                                                    {
  FML_DCHECK(alpha_data_.atlas == nullptr && color_data_.atlas == nullptr);
  AtlasData& data = GetData(frame->GetAtlasType());
  data.renderable_frames.emplace_back(
      frame, transform * Matrix::MakeTranslation(position), properties);
}

References impeller::Matrix::MakeTranslation(), and transform.

Referenced by impeller::testing::TEST_P().

CreateOrGetGlyphAtlas()

const std::shared_ptr< GlyphAtlas > & impeller::LazyGlyphAtlas::CreateOrGetGlyphAtlas	(	Context &	context,
		HostBuffer &	host_buffer,
		GlyphAtlas::Type	type
	)

Definition at line 50 of file lazy_glyph_atlas.cc.

                         {
  AtlasData& data = GetData(type);
  if (data.atlas) {
    return data.atlas;
  }
 
  if (!typographer_context_) {
    VALIDATION_LOG << "Unable to render text because a TypographerContext has "
                      "not been set.";
    return kNullGlyphAtlas;
  }
  if (!typographer_context_->IsValid()) {
    VALIDATION_LOG
        << "Unable to render text because the TypographerContext is invalid.";
    return kNullGlyphAtlas;
  }
 
  data.atlas = typographer_context_->CreateGlyphAtlas(
      context, type, data_host_buffer, data.context, data.renderable_frames);
  if (!data.atlas || !data.atlas->IsValid()) {
    VALIDATION_LOG << "Could not create valid atlas.";
    return kNullGlyphAtlas;
  }
  return data.atlas;
}

References impeller::kNullGlyphAtlas, and VALIDATION_LOG.

Referenced by impeller::testing::TEST_P().

ResetTextFrames()

void impeller::LazyGlyphAtlas::ResetTextFrames

(

)

Definition at line 45 of file lazy_glyph_atlas.cc.

                                     {
  alpha_data_.reset();
  color_data_.reset();
}

---

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

• impeller/typographer/lazy_glyph_atlas.h
• impeller/typographer/lazy_glyph_atlas.cc