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1 // Copyright 2014 The PDFium Authors
2 // Use of this source code is governed by a BSD-style license that can be
3 // found in the LICENSE file.
4 
5 // Original code copyright 2014 Foxit Software Inc. http://www.foxitsoftware.com
6 
7 #ifndef CORE_FXCODEC_JBIG2_JBIG2_IMAGE_H_
8 #define CORE_FXCODEC_JBIG2_JBIG2_IMAGE_H_
9 
10 #include <memory>
11 
12 #include "core/fxcodec/jbig2/JBig2_Define.h"
13 #include "core/fxcrt/fx_memory_wrappers.h"
14 #include "core/fxcrt/maybe_owned.h"
15 #include "third_party/base/span.h"
16 
17 struct FX_RECT;
18 
19 enum JBig2ComposeOp {
20   JBIG2_COMPOSE_OR = 0,
21   JBIG2_COMPOSE_AND = 1,
22   JBIG2_COMPOSE_XOR = 2,
23   JBIG2_COMPOSE_XNOR = 3,
24   JBIG2_COMPOSE_REPLACE = 4
25 };
26 
27 class CJBig2_Image {
28  public:
29   CJBig2_Image(int32_t w, int32_t h);
30   CJBig2_Image(int32_t w,
31                int32_t h,
32                int32_t stride,
33                pdfium::span<uint8_t> pBuf);
34   CJBig2_Image(const CJBig2_Image& other);
35   ~CJBig2_Image();
36 
37   static bool IsValidImageSize(int32_t w, int32_t h);
38 
width()39   int32_t width() const { return m_nWidth; }
height()40   int32_t height() const { return m_nHeight; }
stride()41   int32_t stride() const { return m_nStride; }
42 
data()43   uint8_t* data() const { return m_pData.Get(); }
44 
45   int GetPixel(int32_t x, int32_t y) const;
46   void SetPixel(int32_t x, int32_t y, int v);
47 
GetLineUnsafe(int32_t y)48   uint8_t* GetLineUnsafe(int32_t y) const { return data() + y * m_nStride; }
GetLine(int32_t y)49   uint8_t* GetLine(int32_t y) const {
50     return (y >= 0 && y < m_nHeight) ? GetLineUnsafe(y) : nullptr;
51   }
52 
53   void CopyLine(int32_t hTo, int32_t hFrom);
54   void Fill(bool v);
55 
56   bool ComposeFrom(int32_t x, int32_t y, CJBig2_Image* pSrc, JBig2ComposeOp op);
57   bool ComposeFromWithRect(int32_t x,
58                            int32_t y,
59                            CJBig2_Image* pSrc,
60                            const FX_RECT& rtSrc,
61                            JBig2ComposeOp op);
62 
63   std::unique_ptr<CJBig2_Image> SubImage(int32_t x,
64                                          int32_t y,
65                                          int32_t w,
66                                          int32_t h);
67   void Expand(int32_t h, bool v);
68 
69   bool ComposeTo(CJBig2_Image* pDst, int32_t x, int32_t y, JBig2ComposeOp op);
70   bool ComposeToWithRect(CJBig2_Image* pDst,
71                          int32_t x,
72                          int32_t y,
73                          const FX_RECT& rtSrc,
74                          JBig2ComposeOp op);
75 
76  private:
77   void SubImageFast(int32_t x,
78                     int32_t y,
79                     int32_t w,
80                     int32_t h,
81                     CJBig2_Image* pImage);
82   void SubImageSlow(int32_t x,
83                     int32_t y,
84                     int32_t w,
85                     int32_t h,
86                     CJBig2_Image* pImage);
87   bool ComposeToInternal(CJBig2_Image* pDst,
88                          int32_t x,
89                          int32_t y,
90                          JBig2ComposeOp op,
91                          const FX_RECT& rtSrc);
92 
93   MaybeOwned<uint8_t, FxFreeDeleter> m_pData;
94   int32_t m_nWidth = 0;   // 1-bit pixels
95   int32_t m_nHeight = 0;  // lines
96   int32_t m_nStride = 0;  // bytes, must be multiple of 4.
97 };
98 
99 #endif  // CORE_FXCODEC_JBIG2_JBIG2_IMAGE_H_
100