| Flutter Impeller |

Public Member Functions | List of all members
impeller::LazyGlyphAtlas Class Reference

`#include <lazy_glyph_atlas.h>`

## Public Member Functions
| LazyGlyphAtlas (std::shared_ptr< TypographerContext > typographer_context)
| ~LazyGlyphAtlas ()
void | AddTextFrame (const TextFrame &frame, Scalar scale)
void | ResetTextFrames ()
const std::shared_ptr< GlyphAtlas > & | CreateOrGetGlyphAtlas (Context &context, GlyphAtlas::Type type) const

## Detailed Description

Definition at line 18 of file lazy_glyph_atlas.h.

## Constructor & Destructor Documentation

## ◆ LazyGlyphAtlas()

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

Definition at line 19 of file lazy_glyph_atlas.cc.

21 : typographer_context_(std::move(typographer_context)),
22 alpha_context_(typographer_context_
23 ? typographer_context_->CreateGlyphAtlasContext()
24 : nullptr),
25 color_context_(typographer_context_
26 ? typographer_context_->CreateGlyphAtlasContext()
27 : nullptr) {}

## ◆ ~LazyGlyphAtlas()

impeller::LazyGlyphAtlas::~LazyGlyphAtlas | ( |  | ) |
| default

## Member Function Documentation

## ◆ AddTextFrame()

void impeller::LazyGlyphAtlas::AddTextFrame | ( | const TextFrame & | frame,
|  | Scalar | scale
| ) |  |

Definition at line 31 of file lazy_glyph_atlas.cc.

31 {
32 FML_DCHECK(alpha_atlas_ == nullptr && color_atlas_ == nullptr);
33 if (frame.GetAtlasType() == GlyphAtlas::Type::kAlphaBitmap) {
34 frame.CollectUniqueFontGlyphPairs(alpha_glyph_map_, scale);
35 } else {
36 frame.CollectUniqueFontGlyphPairs(color_glyph_map_, scale);
37 }
38 }

References impeller::TextFrame::CollectUniqueFontGlyphPairs(), impeller::TextFrame::GetAtlasType(), impeller::GlyphAtlas::kAlphaBitmap, and scale.

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

## ◆ CreateOrGetGlyphAtlas()

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

Definition at line 47 of file lazy_glyph_atlas.cc.

49 {
50 {
51 if (type == GlyphAtlas::Type::kAlphaBitmap && alpha_atlas_) {
52 return alpha_atlas_;
53 }
54 if (type == GlyphAtlas::Type::kColorBitmap && color_atlas_) {
55 return color_atlas_;
56 }
57 }
58
59 if (!typographer_context_) {
60 VALIDATION_LOG << "Unable to render text because a TypographerContext has "
61 "not been set.";
62 return kNullGlyphAtlas;
63 }
64 if (!typographer_context_->IsValid()) {
65 VALIDATION_LOG
66 << "Unable to render text because the TypographerContext is invalid.";
67 return kNullGlyphAtlas;
68 }
69
70 auto& glyph_map = type == GlyphAtlas::Type::kAlphaBitmap ? alpha_glyph_map_
71 : color_glyph_map_;
72 const std::shared_ptr<GlyphAtlasContext>& atlas_context =
73 type == GlyphAtlas::Type::kAlphaBitmap ? alpha_context_ : color_context_;
74 std::shared_ptr<GlyphAtlas> atlas = typographer_context_->CreateGlyphAtlas(
75 context, type, atlas_context, glyph_map);
76 if (!atlas || !atlas->IsValid()) {
77 VALIDATION_LOG << "Could not create valid atlas.";
78 return kNullGlyphAtlas;
79 }
80 if (type == GlyphAtlas::Type::kAlphaBitmap) {
81 alpha_atlas_ = std::move(atlas);
82 return alpha_atlas_;
83 }
84 if (type == GlyphAtlas::Type::kColorBitmap) {
85 color_atlas_ = std::move(atlas);
86 return color_atlas_;
87 }
88 FML_UNREACHABLE();
89 }

References impeller::GlyphAtlas::kAlphaBitmap, impeller::GlyphAtlas::kColorBitmap, impeller::kNullGlyphAtlas, and VALIDATION_LOG.

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

## ◆ ResetTextFrames()

void impeller::LazyGlyphAtlas::ResetTextFrames | ( |  | ) |

Definition at line 40 of file lazy_glyph_atlas.cc.

40 {
41 alpha_glyph_map_.clear();
42 color_glyph_map_.clear();
43 alpha_atlas_.reset();
44 color_atlas_.reset();
45 }

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

- impeller/typographer/lazy_glyph_atlas.h
- impeller/typographer/lazy_glyph_atlas.cc

impeller::GlyphAtlas::Type::kColorBitmap
@ kColorBitmap
impeller::GlyphAtlas::Type::kAlphaBitmap
@ kAlphaBitmap
impeller::kNullGlyphAtlas
static const std::shared_ptr< GlyphAtlas > kNullGlyphAtlas
Definition: lazy_glyph_atlas.cc:17
VALIDATION_LOG
#define VALIDATION_LOG
Definition: validation.h:73
scale
const Scalar scale
Definition: stroke_path_geometry.cc:297