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comparison: gfx/thebes/gfxDWriteTextAnalysis.h
gfx/thebes/gfxDWriteTextAnalysis.h
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| -1:000000000000 | 0:eb64f284f353 |
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| 1 /* -*- Mode: C++; tab-width: 20; indent-tabs-mode: nil; c-basic-offset: 4 -*- | |
| 2 * This Source Code Form is subject to the terms of the Mozilla Public | |
| 3 * License, v. 2.0. If a copy of the MPL was not distributed with this | |
| 4 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */ | |
| 5 | |
| 6 #ifndef GFX_DWRITETEXTANALYSIS_H | |
| 7 #define GFX_DWRITETEXTANALYSIS_H | |
| 8 | |
| 9 #include "gfxDWriteCommon.h" | |
| 10 | |
| 11 // Helper source/sink class for text analysis. | |
| 12 class TextAnalysis | |
| 13 : public IDWriteTextAnalysisSource, | |
| 14 public IDWriteTextAnalysisSink | |
| 15 { | |
| 16 public: | |
| 17 | |
| 18 // IUnknown interface | |
| 19 IFACEMETHOD(QueryInterface)(IID const& iid, OUT void** ppObject) | |
| 20 { | |
| 21 if (iid == __uuidof(IDWriteTextAnalysisSource)) { | |
| 22 *ppObject = static_cast<IDWriteTextAnalysisSource*>(this); | |
| 23 return S_OK; | |
| 24 } else if (iid == __uuidof(IDWriteTextAnalysisSink)) { | |
| 25 *ppObject = static_cast<IDWriteTextAnalysisSink*>(this); | |
| 26 return S_OK; | |
| 27 } else if (iid == __uuidof(IUnknown)) { | |
| 28 *ppObject = | |
| 29 static_cast<IUnknown*>(static_cast<IDWriteTextAnalysisSource*>(this)); | |
| 30 return S_OK; | |
| 31 } else { | |
| 32 return E_NOINTERFACE; | |
| 33 } | |
| 34 } | |
| 35 | |
| 36 IFACEMETHOD_(ULONG, AddRef)() | |
| 37 { | |
| 38 return 1; | |
| 39 } | |
| 40 | |
| 41 IFACEMETHOD_(ULONG, Release)() | |
| 42 { | |
| 43 return 1; | |
| 44 } | |
| 45 | |
| 46 // A single contiguous run of characters containing the same analysis | |
| 47 // results. | |
| 48 struct Run | |
| 49 { | |
| 50 UINT32 mTextStart; // starting text position of this run | |
| 51 UINT32 mTextLength; // number of contiguous code units covered | |
| 52 UINT32 mGlyphStart; // starting glyph in the glyphs array | |
| 53 UINT32 mGlyphCount; // number of glyphs associated with this run of | |
| 54 // text | |
| 55 DWRITE_SCRIPT_ANALYSIS mScript; | |
| 56 UINT8 mBidiLevel; | |
| 57 bool mIsSideways; | |
| 58 | |
| 59 inline bool ContainsTextPosition(UINT32 aTextPosition) const | |
| 60 { | |
| 61 return aTextPosition >= mTextStart | |
| 62 && aTextPosition < mTextStart + mTextLength; | |
| 63 } | |
| 64 | |
| 65 Run *nextRun; | |
| 66 }; | |
| 67 | |
| 68 public: | |
| 69 TextAnalysis(const wchar_t* text, | |
| 70 UINT32 textLength, | |
| 71 const wchar_t* localeName, | |
| 72 DWRITE_READING_DIRECTION readingDirection); | |
| 73 | |
| 74 ~TextAnalysis(); | |
| 75 | |
| 76 STDMETHODIMP GenerateResults(IDWriteTextAnalyzer* textAnalyzer, | |
| 77 Run **runHead); | |
| 78 | |
| 79 // IDWriteTextAnalysisSource implementation | |
| 80 | |
| 81 IFACEMETHODIMP GetTextAtPosition(UINT32 textPosition, | |
| 82 OUT WCHAR const** textString, | |
| 83 OUT UINT32* textLength); | |
| 84 | |
| 85 IFACEMETHODIMP GetTextBeforePosition(UINT32 textPosition, | |
| 86 OUT WCHAR const** textString, | |
| 87 OUT UINT32* textLength); | |
| 88 | |
| 89 IFACEMETHODIMP_(DWRITE_READING_DIRECTION) | |
| 90 GetParagraphReadingDirection() throw(); | |
| 91 | |
| 92 IFACEMETHODIMP GetLocaleName(UINT32 textPosition, | |
| 93 OUT UINT32* textLength, | |
| 94 OUT WCHAR const** localeName); | |
| 95 | |
| 96 IFACEMETHODIMP | |
| 97 GetNumberSubstitution(UINT32 textPosition, | |
| 98 OUT UINT32* textLength, | |
| 99 OUT IDWriteNumberSubstitution** numberSubstitution); | |
| 100 | |
| 101 // IDWriteTextAnalysisSink implementation | |
| 102 | |
| 103 IFACEMETHODIMP | |
| 104 SetScriptAnalysis(UINT32 textPosition, | |
| 105 UINT32 textLength, | |
| 106 DWRITE_SCRIPT_ANALYSIS const* scriptAnalysis); | |
| 107 | |
| 108 IFACEMETHODIMP | |
| 109 SetLineBreakpoints(UINT32 textPosition, | |
| 110 UINT32 textLength, | |
| 111 const DWRITE_LINE_BREAKPOINT* lineBreakpoints); | |
| 112 | |
| 113 IFACEMETHODIMP SetBidiLevel(UINT32 textPosition, | |
| 114 UINT32 textLength, | |
| 115 UINT8 explicitLevel, | |
| 116 UINT8 resolvedLevel); | |
| 117 | |
| 118 IFACEMETHODIMP | |
| 119 SetNumberSubstitution(UINT32 textPosition, | |
| 120 UINT32 textLength, | |
| 121 IDWriteNumberSubstitution* numberSubstitution); | |
| 122 | |
| 123 protected: | |
| 124 Run *FetchNextRun(IN OUT UINT32* textLength); | |
| 125 | |
| 126 void SetCurrentRun(UINT32 textPosition); | |
| 127 | |
| 128 void SplitCurrentRun(UINT32 splitPosition); | |
| 129 | |
| 130 protected: | |
| 131 // Input | |
| 132 // (weak references are fine here, since this class is a transient | |
| 133 // stack-based helper that doesn't need to copy data) | |
| 134 UINT32 mTextLength; | |
| 135 const wchar_t* mText; | |
| 136 const wchar_t* mLocaleName; | |
| 137 DWRITE_READING_DIRECTION mReadingDirection; | |
| 138 | |
| 139 // Current processing state. | |
| 140 Run *mCurrentRun; | |
| 141 | |
| 142 // Output is a list of runs starting here | |
| 143 Run mRunHead; | |
| 144 }; | |
| 145 | |
| 146 #endif /* GFX_DWRITETEXTANALYSIS_H */ |
