Flutter Impeller
lazy_glyph_atlas.h
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1 // Copyright 2013 The Flutter Authors. All rights reserved.
2 // Use of this source code is governed by a BSD-style license that can be
3 // found in the LICENSE file.
4 
5 #ifndef FLUTTER_IMPELLER_TYPOGRAPHER_LAZY_GLYPH_ATLAS_H_
6 #define FLUTTER_IMPELLER_TYPOGRAPHER_LAZY_GLYPH_ATLAS_H_
7 
8 #include <unordered_map>
9 
10 #include "flutter/fml/macros.h"
15 
16 namespace impeller {
17 
19  public:
20  explicit LazyGlyphAtlas(
21  std::shared_ptr<TypographerContext> typographer_context);
22 
24 
25  void AddTextFrame(const TextFrame& frame, Scalar scale);
26 
27  void ResetTextFrames();
28 
29  const std::shared_ptr<GlyphAtlas>& CreateOrGetGlyphAtlas(
30  Context& context,
31  GlyphAtlas::Type type) const;
32 
33  private:
34  std::shared_ptr<TypographerContext> typographer_context_;
35 
36  FontGlyphMap alpha_glyph_map_;
37  FontGlyphMap color_glyph_map_;
38  std::shared_ptr<GlyphAtlasContext> alpha_context_;
39  std::shared_ptr<GlyphAtlasContext> color_context_;
40  mutable std::shared_ptr<GlyphAtlas> alpha_atlas_;
41  mutable std::shared_ptr<GlyphAtlas> color_atlas_;
42 
43  LazyGlyphAtlas(const LazyGlyphAtlas&) = delete;
44 
45  LazyGlyphAtlas& operator=(const LazyGlyphAtlas&) = delete;
46 };
47 
48 } // namespace impeller
49 
50 #endif // FLUTTER_IMPELLER_TYPOGRAPHER_LAZY_GLYPH_ATLAS_H_
impeller::LazyGlyphAtlas::~LazyGlyphAtlas
~LazyGlyphAtlas()
impeller::Scalar
float Scalar
Definition: scalar.h:18
impeller::LazyGlyphAtlas::ResetTextFrames
void ResetTextFrames()
Definition: lazy_glyph_atlas.cc:40
impeller::TextFrame
Represents a collection of shaped text runs.
Definition: text_frame.h:20
impeller::LazyGlyphAtlas::AddTextFrame
void AddTextFrame(const TextFrame &frame, Scalar scale)
Definition: lazy_glyph_atlas.cc:31
impeller::FontGlyphMap
std::unordered_map< ScaledFont, std::unordered_set< Glyph > > FontGlyphMap
Definition: font_glyph_pair.h:29
typographer_context.h
impeller::LazyGlyphAtlas::CreateOrGetGlyphAtlas
const std::shared_ptr< GlyphAtlas > & CreateOrGetGlyphAtlas(Context &context, GlyphAtlas::Type type) const
Definition: lazy_glyph_atlas.cc:47
impeller::LazyGlyphAtlas::LazyGlyphAtlas
LazyGlyphAtlas(std::shared_ptr< TypographerContext > typographer_context)
Definition: lazy_glyph_atlas.cc:19
impeller::GlyphAtlas::Type
Type
Describes how the glyphs are represented in the texture.
Definition: glyph_atlas.h:32
impeller::Context
To do anything rendering related with Impeller, you need a context.
Definition: context.h:46
scale
const Scalar scale
Definition: stroke_path_geometry.cc:297
context.h
glyph_atlas.h
text_frame.h
impeller::LazyGlyphAtlas
Definition: lazy_glyph_atlas.h:18
impeller
Definition: aiks_blur_unittests.cc:20