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 XFA_FGAS_LAYOUT_CFGAS_TXTBREAK_H_
8 #define XFA_FGAS_LAYOUT_CFGAS_TXTBREAK_H_
9
10 #include <deque>
11 #include <vector>
12
13 #include "core/fxcrt/fx_coordinates.h"
14 #include "core/fxcrt/retain_ptr.h"
15 #include "xfa/fgas/layout/cfgas_break.h"
16 #include "xfa/fgas/layout/cfgas_char.h"
17
18 class CFGAS_GEFont;
19 class TextCharPos;
20
21 #define FX_TXTCHARSTYLE_ArabicShadda 0x0020
22 #define FX_TXTCHARSTYLE_OddBidiLevel 0x0040
23
24 enum CFX_TxtLineAlignment {
25 CFX_TxtLineAlignment_Left = 0,
26 CFX_TxtLineAlignment_Center = 1 << 0,
27 CFX_TxtLineAlignment_Right = 1 << 1,
28 CFX_TxtLineAlignment_Justified = 1 << 2
29 };
30
CFX_BreakTypeNoneOrPiece(CFGAS_Char::BreakType type)31 inline bool CFX_BreakTypeNoneOrPiece(CFGAS_Char::BreakType type) {
32 return type == CFGAS_Char::BreakType::kNone ||
33 type == CFGAS_Char::BreakType::kPiece;
34 }
35
36 class CFGAS_TxtBreak final : public CFGAS_Break {
37 public:
38 class Engine {
39 public:
40 virtual ~Engine();
41 virtual wchar_t GetChar(size_t idx) const = 0;
42 // May return negative for combining characters. Non-const so we can force
43 // a layout if needed.
44 virtual int32_t GetWidthOfChar(size_t idx) = 0;
45 };
46
47 struct Run {
48 Run();
49 Run(const Run& other);
50 ~Run();
51
52 CFGAS_TxtBreak::Engine* pEdtEngine = nullptr;
53 WideString wsStr;
54 int32_t* pWidths = nullptr;
55 // TODO(thestig): These 2 members probably should be size_t.
56 int32_t iStart = 0;
57 int32_t iLength = 0;
58 RetainPtr<CFGAS_GEFont> pFont;
59 float fFontSize = 12.0f;
60 Mask<LayoutStyle> dwStyles = LayoutStyle::kNone;
61 int32_t iHorizontalScale = 100;
62 int32_t iVerticalScale = 100;
63 uint32_t dwCharStyles = 0;
64 const CFX_RectF* pRect = nullptr;
65 bool bSkipSpace = true;
66 };
67
68 CFGAS_TxtBreak();
69 ~CFGAS_TxtBreak() override;
70
71 void SetLineWidth(float fLineWidth);
72 void SetAlignment(int32_t iAlignment);
73 void SetCombWidth(float fCombWidth);
74 CFGAS_Char::BreakType EndBreak(CFGAS_Char::BreakType dwStatus);
75
76 size_t GetDisplayPos(const Run& run, TextCharPos* pCharPos) const;
77 std::vector<CFX_RectF> GetCharRects(const Run& run) const;
78 CFGAS_Char::BreakType AppendChar(wchar_t wch);
79
80 private:
81 void AppendChar_Combination(CFGAS_Char* pCurChar);
82 void AppendChar_Tab(CFGAS_Char* pCurChar);
83 CFGAS_Char::BreakType AppendChar_Control(CFGAS_Char* pCurChar);
84 CFGAS_Char::BreakType AppendChar_Arabic(CFGAS_Char* pCurChar);
85 CFGAS_Char::BreakType AppendChar_Others(CFGAS_Char* pCurChar);
86
87 void ResetContextCharStyles();
88 void EndBreakSplitLine(CFGAS_BreakLine* pNextLine, bool bAllChars);
89 std::deque<TPO> EndBreakBidiLine(CFGAS_Char::BreakType dwStatus);
90 void EndBreakAlignment(const std::deque<TPO>& tpos,
91 bool bAllChars,
92 CFGAS_Char::BreakType dwStatus);
93 int32_t GetBreakPos(std::vector<CFGAS_Char>* pChars,
94 bool bAllChars,
95 bool bOnlyBrk,
96 int32_t* pEndPos);
97 void SplitTextLine(CFGAS_BreakLine* pCurLine,
98 CFGAS_BreakLine* pNextLine,
99 bool bAllChars);
100
101 int32_t m_iAlignment = CFX_TxtLineAlignment_Left;
102 int32_t m_iCombWidth = 360000;
103 };
104
105 #endif // XFA_FGAS_LAYOUT_CFGAS_TXTBREAK_H_
106