lazy_glyph_atlas.h

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// Copyright 2013 The Flutter Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
 
#pragma once
 
#include <unordered_map>
 
#include "flutter/fml/macros.h"
#include "impeller/renderer/context.h"
#include "impeller/typographer/glyph_atlas.h"
#include "impeller/typographer/text_frame.h"
#include "impeller/typographer/typographer_context.h"
 
namespace impeller {
 
class LazyGlyphAtlas {
 public:
  explicit LazyGlyphAtlas(
      std::shared_ptr<TypographerContext> typographer_context);
 
  ~LazyGlyphAtlas();
 
  void AddTextFrame(const TextFrame& frame, Scalar scale);
 
  void ResetTextFrames();
 
  std::shared_ptr<GlyphAtlas> CreateOrGetGlyphAtlas(
      Context& context,
      GlyphAtlas::Type type) const;
 
 private:
  std::shared_ptr<TypographerContext> typographer_context_;
 
  FontGlyphMap alpha_glyph_map_;
  FontGlyphMap color_glyph_map_;
  std::shared_ptr<GlyphAtlasContext> alpha_context_;
  std::shared_ptr<GlyphAtlasContext> color_context_;
  mutable std::unordered_map<GlyphAtlas::Type, std::shared_ptr<GlyphAtlas>>
      atlas_map_;
 
  FML_DISALLOW_COPY_AND_ASSIGN(LazyGlyphAtlas);
};
 
}  // namespace impeller