glyph_atlas_context_stb.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_STB_GLYPH_ATLAS_CONTEXT_STB_H_
#define FLUTTER_IMPELLER_TYPOGRAPHER_BACKENDS_STB_GLYPH_ATLAS_CONTEXT_STB_H_
 
#include "impeller/base/backend_cast.h"
#include "impeller/typographer/glyph_atlas.h"
 
namespace impeller {
 
class BitmapSTB {
 public:
  BitmapSTB();
 
  ~BitmapSTB();
 
  BitmapSTB(size_t width, size_t height, size_t bytes_per_pixel);
 
  uint8_t* GetPixels();
 
  uint8_t* GetPixelAddress(TPoint<size_t> coords);
 
  size_t GetRowBytes() const;
 
  size_t GetWidth() const;
 
  size_t GetHeight() const;
 
  size_t GetSize() const;
 
 private:
  size_t width_ = 0;
  size_t height_ = 0;
  size_t bytes_per_pixel_ = 0;
  std::vector<uint8_t> pixels_;
};
 
class GlyphAtlasContextSTB
    : public GlyphAtlasContext,
      public BackendCast<GlyphAtlasContextSTB, GlyphAtlasContext> {
 public:
  GlyphAtlasContextSTB();
 
  ~GlyphAtlasContextSTB() override;
 
  //----------------------------------------------------------------------------
  /// @brief      Retrieve the previous (if any) BitmapSTB instance.
  std::shared_ptr<BitmapSTB> GetBitmap() const;
 
  void UpdateBitmap(std::shared_ptr<BitmapSTB> bitmap);
 
 private:
  std::shared_ptr<BitmapSTB> bitmap_;
 
  GlyphAtlasContextSTB(const GlyphAtlasContextSTB&) = delete;
 
  GlyphAtlasContextSTB& operator=(const GlyphAtlasContextSTB&) = delete;
};
 
}  // namespace impeller
 
#endif  // FLUTTER_IMPELLER_TYPOGRAPHER_BACKENDS_STB_GLYPH_ATLAS_CONTEXT_STB_H_