glyph_atlas_context_skia.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_BACKENDS_SKIA_GLYPH_ATLAS_CONTEXT_SKIA_H_
#define FLUTTER_IMPELLER_TYPOGRAPHER_BACKENDS_SKIA_GLYPH_ATLAS_CONTEXT_SKIA_H_
 
#include "impeller/base/backend_cast.h"
#include "impeller/typographer/glyph_atlas.h"
 
class SkBitmap;
 
namespace impeller {
 
//------------------------------------------------------------------------------
/// @brief      A container for caching a glyph atlas across frames.
///
class GlyphAtlasContextSkia
    : public GlyphAtlasContext,
      public BackendCast<GlyphAtlasContextSkia, GlyphAtlasContext> {
 public:
  GlyphAtlasContextSkia();
 
  ~GlyphAtlasContextSkia() override;
 
  //----------------------------------------------------------------------------
  /// @brief      Retrieve the previous (if any) SkBitmap instance.
  std::shared_ptr<SkBitmap> GetBitmap() const;
 
  void UpdateBitmap(std::shared_ptr<SkBitmap> bitmap);
 
 private:
  std::shared_ptr<SkBitmap> bitmap_;
 
  GlyphAtlasContextSkia(const GlyphAtlasContextSkia&) = delete;
 
  GlyphAtlasContextSkia& operator=(const GlyphAtlasContextSkia&) = delete;
};
 
}  // namespace impeller
 
#endif  // FLUTTER_IMPELLER_TYPOGRAPHER_BACKENDS_SKIA_GLYPH_ATLAS_CONTEXT_SKIA_H_