Flutter Impeller
glyph_atlas_context_stb.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_BACKENDS_STB_GLYPH_ATLAS_CONTEXT_STB_H_
6 #define FLUTTER_IMPELLER_TYPOGRAPHER_BACKENDS_STB_GLYPH_ATLAS_CONTEXT_STB_H_
7 
10 
11 namespace impeller {
12 
13 class BitmapSTB {
14  public:
15  BitmapSTB();
16 
17  ~BitmapSTB();
18 
19  BitmapSTB(size_t width, size_t height, size_t bytes_per_pixel);
20 
21  uint8_t* GetPixels();
22 
23  uint8_t* GetPixelAddress(TPoint<size_t> coords);
24 
25  size_t GetRowBytes() const;
26 
27  size_t GetWidth() const;
28 
29  size_t GetHeight() const;
30 
31  size_t GetSize() const;
32 
33  private:
34  size_t width_ = 0;
35  size_t height_ = 0;
36  size_t bytes_per_pixel_ = 0;
37  std::vector<uint8_t> pixels_;
38 };
39 
41  : public GlyphAtlasContext,
42  public BackendCast<GlyphAtlasContextSTB, GlyphAtlasContext> {
43  public:
45 
46  ~GlyphAtlasContextSTB() override;
47 
48  //----------------------------------------------------------------------------
49  /// @brief Retrieve the previous (if any) BitmapSTB instance.
50  std::shared_ptr<BitmapSTB> GetBitmap() const;
51 
52  void UpdateBitmap(std::shared_ptr<BitmapSTB> bitmap);
53 
54  private:
55  std::shared_ptr<BitmapSTB> bitmap_;
56 
58 
59  GlyphAtlasContextSTB& operator=(const GlyphAtlasContextSTB&) = delete;
60 };
61 
62 } // namespace impeller
63 
64 #endif // FLUTTER_IMPELLER_TYPOGRAPHER_BACKENDS_STB_GLYPH_ATLAS_CONTEXT_STB_H_
impeller::BitmapSTB::BitmapSTB
BitmapSTB()
impeller::GlyphAtlasContextSTB
Definition: glyph_atlas_context_stb.h:40
impeller::GlyphAtlasContextSTB::UpdateBitmap
void UpdateBitmap(std::shared_ptr< BitmapSTB > bitmap)
Definition: glyph_atlas_context_stb.cc:54
impeller::GlyphAtlasContextSTB::GetBitmap
std::shared_ptr< BitmapSTB > GetBitmap() const
Retrieve the previous (if any) BitmapSTB instance.
Definition: glyph_atlas_context_stb.cc:50
impeller::BitmapSTB::GetPixels
uint8_t * GetPixels()
Definition: glyph_atlas_context_stb.cc:19
impeller::BitmapSTB::GetWidth
size_t GetWidth() const
Definition: glyph_atlas_context_stb.cc:34
impeller::BitmapSTB::GetPixelAddress
uint8_t * GetPixelAddress(TPoint< size_t > coords)
Definition: glyph_atlas_context_stb.cc:23
impeller::BitmapSTB
Definition: glyph_atlas_context_stb.h:13
impeller::BitmapSTB::~BitmapSTB
~BitmapSTB()
impeller::BitmapSTB::GetSize
size_t GetSize() const
Definition: glyph_atlas_context_stb.cc:42
impeller::GlyphAtlasContextSTB::~GlyphAtlasContextSTB
~GlyphAtlasContextSTB() override
impeller::BitmapSTB::GetRowBytes
size_t GetRowBytes() const
Definition: glyph_atlas_context_stb.cc:30
impeller::GlyphAtlasContextSTB::GlyphAtlasContextSTB
GlyphAtlasContextSTB()
backend_cast.h
impeller::GlyphAtlasContext
A container for caching a glyph atlas across frames.
Definition: glyph_atlas.h:146
impeller::BitmapSTB::GetHeight
size_t GetHeight() const
Definition: glyph_atlas_context_stb.cc:38
impeller::BackendCast
Definition: backend_cast.h:11
impeller::TPoint
Definition: point.h:27
glyph_atlas.h
impeller
Definition: aiks_blur_unittests.cc:20