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.
 
#ifndef FLUTTER_IMPELLER_TYPOGRAPHER_LAZY_GLYPH_ATLAS_H_
#define FLUTTER_IMPELLER_TYPOGRAPHER_LAZY_GLYPH_ATLAS_H_
 
#include "impeller/geometry/rational.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 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);
 
 private:
  std::shared_ptr<TypographerContext> typographer_context_;
 
  struct AtlasData {
    explicit AtlasData(std::shared_ptr<GlyphAtlasContext> context);
 
    ~AtlasData();
 
    std::vector<RenderableText> renderable_frames;
    std::shared_ptr<GlyphAtlasContext> context;
    std::shared_ptr<GlyphAtlas> atlas;
 
    void reset();
  };
 
  AtlasData alpha_data_;
  AtlasData color_data_;
 
  AtlasData& GetData(GlyphAtlas::Type type);
 
  LazyGlyphAtlas(const LazyGlyphAtlas&) = delete;
 
  LazyGlyphAtlas& operator=(const LazyGlyphAtlas&) = delete;
};
 
}  // namespace impeller
 
#endif  // FLUTTER_IMPELLER_TYPOGRAPHER_LAZY_GLYPH_ATLAS_H_