1.1 --- /dev/null Thu Jan 01 00:00:00 1970 +0000
1.2 +++ b/gfx/thebes/gfxDWriteTextAnalysis.h Wed Dec 31 06:09:35 2014 +0100
1.3 @@ -0,0 +1,146 @@
1.4 +/* -*- Mode: C++; tab-width: 20; indent-tabs-mode: nil; c-basic-offset: 4 -*-
1.5 + * This Source Code Form is subject to the terms of the Mozilla Public
1.6 + * License, v. 2.0. If a copy of the MPL was not distributed with this
1.7 + * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
1.8 +
1.9 +#ifndef GFX_DWRITETEXTANALYSIS_H
1.10 +#define GFX_DWRITETEXTANALYSIS_H
1.11 +
1.12 +#include "gfxDWriteCommon.h"
1.13 +
1.14 +// Helper source/sink class for text analysis.
1.15 +class TextAnalysis
1.16 + : public IDWriteTextAnalysisSource,
1.17 + public IDWriteTextAnalysisSink
1.18 +{
1.19 +public:
1.20 +
1.21 + // IUnknown interface
1.22 + IFACEMETHOD(QueryInterface)(IID const& iid, OUT void** ppObject)
1.23 + {
1.24 + if (iid == __uuidof(IDWriteTextAnalysisSource)) {
1.25 + *ppObject = static_cast<IDWriteTextAnalysisSource*>(this);
1.26 + return S_OK;
1.27 + } else if (iid == __uuidof(IDWriteTextAnalysisSink)) {
1.28 + *ppObject = static_cast<IDWriteTextAnalysisSink*>(this);
1.29 + return S_OK;
1.30 + } else if (iid == __uuidof(IUnknown)) {
1.31 + *ppObject =
1.32 + static_cast<IUnknown*>(static_cast<IDWriteTextAnalysisSource*>(this));
1.33 + return S_OK;
1.34 + } else {
1.35 + return E_NOINTERFACE;
1.36 + }
1.37 + }
1.38 +
1.39 + IFACEMETHOD_(ULONG, AddRef)()
1.40 + {
1.41 + return 1;
1.42 + }
1.43 +
1.44 + IFACEMETHOD_(ULONG, Release)()
1.45 + {
1.46 + return 1;
1.47 + }
1.48 +
1.49 + // A single contiguous run of characters containing the same analysis
1.50 + // results.
1.51 + struct Run
1.52 + {
1.53 + UINT32 mTextStart; // starting text position of this run
1.54 + UINT32 mTextLength; // number of contiguous code units covered
1.55 + UINT32 mGlyphStart; // starting glyph in the glyphs array
1.56 + UINT32 mGlyphCount; // number of glyphs associated with this run of
1.57 + // text
1.58 + DWRITE_SCRIPT_ANALYSIS mScript;
1.59 + UINT8 mBidiLevel;
1.60 + bool mIsSideways;
1.61 +
1.62 + inline bool ContainsTextPosition(UINT32 aTextPosition) const
1.63 + {
1.64 + return aTextPosition >= mTextStart
1.65 + && aTextPosition < mTextStart + mTextLength;
1.66 + }
1.67 +
1.68 + Run *nextRun;
1.69 + };
1.70 +
1.71 +public:
1.72 + TextAnalysis(const wchar_t* text,
1.73 + UINT32 textLength,
1.74 + const wchar_t* localeName,
1.75 + DWRITE_READING_DIRECTION readingDirection);
1.76 +
1.77 + ~TextAnalysis();
1.78 +
1.79 + STDMETHODIMP GenerateResults(IDWriteTextAnalyzer* textAnalyzer,
1.80 + Run **runHead);
1.81 +
1.82 + // IDWriteTextAnalysisSource implementation
1.83 +
1.84 + IFACEMETHODIMP GetTextAtPosition(UINT32 textPosition,
1.85 + OUT WCHAR const** textString,
1.86 + OUT UINT32* textLength);
1.87 +
1.88 + IFACEMETHODIMP GetTextBeforePosition(UINT32 textPosition,
1.89 + OUT WCHAR const** textString,
1.90 + OUT UINT32* textLength);
1.91 +
1.92 + IFACEMETHODIMP_(DWRITE_READING_DIRECTION)
1.93 + GetParagraphReadingDirection() throw();
1.94 +
1.95 + IFACEMETHODIMP GetLocaleName(UINT32 textPosition,
1.96 + OUT UINT32* textLength,
1.97 + OUT WCHAR const** localeName);
1.98 +
1.99 + IFACEMETHODIMP
1.100 + GetNumberSubstitution(UINT32 textPosition,
1.101 + OUT UINT32* textLength,
1.102 + OUT IDWriteNumberSubstitution** numberSubstitution);
1.103 +
1.104 + // IDWriteTextAnalysisSink implementation
1.105 +
1.106 + IFACEMETHODIMP
1.107 + SetScriptAnalysis(UINT32 textPosition,
1.108 + UINT32 textLength,
1.109 + DWRITE_SCRIPT_ANALYSIS const* scriptAnalysis);
1.110 +
1.111 + IFACEMETHODIMP
1.112 + SetLineBreakpoints(UINT32 textPosition,
1.113 + UINT32 textLength,
1.114 + const DWRITE_LINE_BREAKPOINT* lineBreakpoints);
1.115 +
1.116 + IFACEMETHODIMP SetBidiLevel(UINT32 textPosition,
1.117 + UINT32 textLength,
1.118 + UINT8 explicitLevel,
1.119 + UINT8 resolvedLevel);
1.120 +
1.121 + IFACEMETHODIMP
1.122 + SetNumberSubstitution(UINT32 textPosition,
1.123 + UINT32 textLength,
1.124 + IDWriteNumberSubstitution* numberSubstitution);
1.125 +
1.126 +protected:
1.127 + Run *FetchNextRun(IN OUT UINT32* textLength);
1.128 +
1.129 + void SetCurrentRun(UINT32 textPosition);
1.130 +
1.131 + void SplitCurrentRun(UINT32 splitPosition);
1.132 +
1.133 +protected:
1.134 + // Input
1.135 + // (weak references are fine here, since this class is a transient
1.136 + // stack-based helper that doesn't need to copy data)
1.137 + UINT32 mTextLength;
1.138 + const wchar_t* mText;
1.139 + const wchar_t* mLocaleName;
1.140 + DWRITE_READING_DIRECTION mReadingDirection;
1.141 +
1.142 + // Current processing state.
1.143 + Run *mCurrentRun;
1.144 +
1.145 + // Output is a list of runs starting here
1.146 + Run mRunHead;
1.147 +};
1.148 +
1.149 +#endif /* GFX_DWRITETEXTANALYSIS_H */
