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 "core/fxcrt/unowned_ptr.h"
16 #include "core/fxcrt/unowned_ptr_exclusion.h"
17 #include "xfa/fgas/layout/cfgas_break.h"
18 #include "xfa/fgas/layout/cfgas_char.h"
19
20 class CFGAS_GEFont;
21 class TextCharPos;
22
23 #define FX_TXTCHARSTYLE_ArabicShadda 0x0020
24 #define FX_TXTCHARSTYLE_OddBidiLevel 0x0040
25
26 enum CFX_TxtLineAlignment {
27 CFX_TxtLineAlignment_Left = 0,
28 CFX_TxtLineAlignment_Center = 1 << 0,
29 CFX_TxtLineAlignment_Right = 1 << 1,
30 CFX_TxtLineAlignment_Justified = 1 << 2
31 };
32
CFX_BreakTypeNoneOrPiece(CFGAS_Char::BreakType type)33 inline bool CFX_BreakTypeNoneOrPiece(CFGAS_Char::BreakType type) {
34 return type == CFGAS_Char::BreakType::kNone ||
35 type == CFGAS_Char::BreakType::kPiece;
36 }
37
38 class CFGAS_TxtBreak final : public CFGAS_Break {
39 public:
40 class Engine {
41 public:
42 virtual ~Engine();
43 virtual wchar_t GetChar(size_t idx) const = 0;
44 // May return negative for combining characters. Non-const so we can force
45 // a layout if needed.
46 virtual int32_t GetWidthOfChar(size_t idx) = 0;
47 };
48
49 struct Run {
50 Run();
51 Run(const Run& other);
52 ~Run();
53
54 UnownedPtr<CFGAS_TxtBreak::Engine> pEdtEngine;
55 WideString wsStr;
56 UNOWNED_PTR_EXCLUSION int32_t* pWidths = nullptr;
57 // TODO(thestig): These 2 members probably should be size_t.
58 int32_t iStart = 0;
59 int32_t iLength = 0;
60 RetainPtr<CFGAS_GEFont> pFont;
61 float fFontSize = 12.0f;
62 Mask<LayoutStyle> dwStyles = LayoutStyle::kNone;
63 int32_t iHorizontalScale = 100;
64 int32_t iVerticalScale = 100;
65 uint32_t dwCharStyles = 0;
66 UnownedPtr<const CFX_RectF> pRect;
67 bool bSkipSpace = true;
68 };
69
70 CFGAS_TxtBreak();
71 ~CFGAS_TxtBreak() override;
72
73 void SetLineWidth(float fLineWidth);
74 void SetAlignment(int32_t iAlignment);
75 void SetCombWidth(float fCombWidth);
76 CFGAS_Char::BreakType EndBreak(CFGAS_Char::BreakType dwStatus);
77
78 size_t GetDisplayPos(const Run& run, TextCharPos* pCharPos) const;
79 std::vector<CFX_RectF> GetCharRects(const Run& run) const;
80 CFGAS_Char::BreakType AppendChar(wchar_t wch);
81
82 private:
83 void AppendChar_Combination(CFGAS_Char* pCurChar);
84 void AppendChar_Tab(CFGAS_Char* pCurChar);
85 CFGAS_Char::BreakType AppendChar_Control(CFGAS_Char* pCurChar);
86 CFGAS_Char::BreakType AppendChar_Arabic(CFGAS_Char* pCurChar);
87 CFGAS_Char::BreakType AppendChar_Others(CFGAS_Char* pCurChar);
88
89 void ResetContextCharStyles();
90 void EndBreakSplitLine(CFGAS_BreakLine* pNextLine, bool bAllChars);
91 std::deque<TPO> EndBreakBidiLine(CFGAS_Char::BreakType dwStatus);
92 void EndBreakAlignment(const std::deque<TPO>& tpos,
93 bool bAllChars,
94 CFGAS_Char::BreakType dwStatus);
95 int32_t GetBreakPos(std::vector<CFGAS_Char>* pChars,
96 bool bAllChars,
97 bool bOnlyBrk,
98 int32_t* pEndPos);
99 void SplitTextLine(CFGAS_BreakLine* pCurLine,
100 CFGAS_BreakLine* pNextLine,
101 bool bAllChars);
102
103 int32_t m_iAlignment = CFX_TxtLineAlignment_Left;
104 int32_t m_iCombWidth = 360000;
105 };
106
107 #endif // XFA_FGAS_LAYOUT_CFGAS_TXTBREAK_H_
108