зеркало из https://github.com/mozilla/gecko-dev.git
147 строки
4.7 KiB
C++
147 строки
4.7 KiB
C++
/* -*- Mode: C++; tab-width: 20; indent-tabs-mode: nil; c-basic-offset: 4 -*-
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* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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#ifndef GFX_DWRITETEXTANALYSIS_H
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#define GFX_DWRITETEXTANALYSIS_H
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#include "gfxDWriteCommon.h"
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// Helper source/sink class for text analysis.
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class TextAnalysis
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: public IDWriteTextAnalysisSource,
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public IDWriteTextAnalysisSink
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{
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public:
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// IUnknown interface
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IFACEMETHOD(QueryInterface)(IID const& iid, OUT void** ppObject)
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{
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if (iid == __uuidof(IDWriteTextAnalysisSource)) {
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*ppObject = static_cast<IDWriteTextAnalysisSource*>(this);
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return S_OK;
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} else if (iid == __uuidof(IDWriteTextAnalysisSink)) {
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*ppObject = static_cast<IDWriteTextAnalysisSink*>(this);
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return S_OK;
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} else if (iid == __uuidof(IUnknown)) {
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*ppObject =
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static_cast<IUnknown*>(static_cast<IDWriteTextAnalysisSource*>(this));
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return S_OK;
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} else {
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return E_NOINTERFACE;
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}
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}
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IFACEMETHOD_(ULONG, AddRef)()
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{
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return 1;
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}
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IFACEMETHOD_(ULONG, Release)()
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{
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return 1;
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}
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// A single contiguous run of characters containing the same analysis
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// results.
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struct Run
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{
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UINT32 mTextStart; // starting text position of this run
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UINT32 mTextLength; // number of contiguous code units covered
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UINT32 mGlyphStart; // starting glyph in the glyphs array
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UINT32 mGlyphCount; // number of glyphs associated with this run of
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// text
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DWRITE_SCRIPT_ANALYSIS mScript;
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UINT8 mBidiLevel;
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bool mIsSideways;
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inline bool ContainsTextPosition(UINT32 aTextPosition) const
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{
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return aTextPosition >= mTextStart
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&& aTextPosition < mTextStart + mTextLength;
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}
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Run *nextRun;
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};
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public:
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TextAnalysis(const wchar_t* text,
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UINT32 textLength,
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const wchar_t* localeName,
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DWRITE_READING_DIRECTION readingDirection);
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~TextAnalysis();
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STDMETHODIMP GenerateResults(IDWriteTextAnalyzer* textAnalyzer,
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Run **runHead);
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// IDWriteTextAnalysisSource implementation
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IFACEMETHODIMP GetTextAtPosition(UINT32 textPosition,
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OUT WCHAR const** textString,
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OUT UINT32* textLength);
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IFACEMETHODIMP GetTextBeforePosition(UINT32 textPosition,
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OUT WCHAR const** textString,
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OUT UINT32* textLength);
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IFACEMETHODIMP_(DWRITE_READING_DIRECTION)
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GetParagraphReadingDirection() throw();
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IFACEMETHODIMP GetLocaleName(UINT32 textPosition,
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OUT UINT32* textLength,
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OUT WCHAR const** localeName);
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IFACEMETHODIMP
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GetNumberSubstitution(UINT32 textPosition,
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OUT UINT32* textLength,
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OUT IDWriteNumberSubstitution** numberSubstitution);
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// IDWriteTextAnalysisSink implementation
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IFACEMETHODIMP
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SetScriptAnalysis(UINT32 textPosition,
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UINT32 textLength,
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DWRITE_SCRIPT_ANALYSIS const* scriptAnalysis);
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IFACEMETHODIMP
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SetLineBreakpoints(UINT32 textPosition,
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UINT32 textLength,
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const DWRITE_LINE_BREAKPOINT* lineBreakpoints);
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IFACEMETHODIMP SetBidiLevel(UINT32 textPosition,
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UINT32 textLength,
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UINT8 explicitLevel,
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UINT8 resolvedLevel);
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IFACEMETHODIMP
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SetNumberSubstitution(UINT32 textPosition,
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UINT32 textLength,
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IDWriteNumberSubstitution* numberSubstitution);
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protected:
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Run *FetchNextRun(IN OUT UINT32* textLength);
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void SetCurrentRun(UINT32 textPosition);
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void SplitCurrentRun(UINT32 splitPosition);
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protected:
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// Input
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// (weak references are fine here, since this class is a transient
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// stack-based helper that doesn't need to copy data)
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UINT32 mTextLength;
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const wchar_t* mText;
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const wchar_t* mLocaleName;
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DWRITE_READING_DIRECTION mReadingDirection;
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// Current processing state.
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Run *mCurrentRun;
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// Output is a list of runs starting here
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Run mRunHead;
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};
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#endif /* GFX_DWRITETEXTANALYSIS_H */
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