gecko-dev/gfx/thebes/gfxDWriteTextAnalysis.h

183 строки
6.3 KiB
C
Исходник Обычный вид История

/* -*- Mode: C++; tab-width: 20; indent-tabs-mode: nil; c-basic-offset: 4 -*-
* ***** BEGIN LICENSE BLOCK *****
* Version: MPL 1.1/GPL 2.0/LGPL 2.1
*
* The contents of this file are subject to the Mozilla Public License Version
* 1.1 (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
* http://www.mozilla.org/MPL/
*
* Software distributed under the License is distributed on an "AS IS" basis,
* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
* for the specific language governing rights and limitations under the
* License.
*
* The Original Code is Mozilla Foundation code.
*
* The Initial Developer of the Original Code is Mozilla Foundation.
* Portions created by the Initial Developer are Copyright (C) 2010
* the Initial Developer. All Rights Reserved.
*
* Contributor(s):
* Bas Schouten <bschouten@mozilla.com>
*
* Alternatively, the contents of this file may be used under the terms of
* either the GNU General Public License Version 2 or later (the "GPL"), or
* the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
* in which case the provisions of the GPL or the LGPL are applicable instead
* of those above. If you wish to allow use of your version of this file only
* under the terms of either the GPL or the LGPL, and not to allow others to
* use your version of this file under the terms of the MPL, indicate your
* decision by deleting the provisions above and replace them with the notice
* and other provisions required by the GPL or the LGPL. If you do not delete
* the provisions above, a recipient may use your version of this file under
* the terms of any one of the MPL, the GPL or the LGPL.
*
* ***** END LICENSE BLOCK ***** */
#ifndef GFX_DWRITETEXTANALYSIS_H
#define GFX_DWRITETEXTANALYSIS_H
#include "gfxDWriteCommon.h"
// Helper source/sink class for text analysis.
class TextAnalysis
: public IDWriteTextAnalysisSource,
public IDWriteTextAnalysisSink
{
public:
// IUnknown interface
IFACEMETHOD(QueryInterface)(IID const& iid, OUT void** ppObject)
{
if (iid == __uuidof(IDWriteTextAnalysisSource)) {
*ppObject = static_cast<IDWriteTextAnalysisSource*>(this);
return S_OK;
} else if (iid == __uuidof(IDWriteTextAnalysisSink)) {
*ppObject = static_cast<IDWriteTextAnalysisSink*>(this);
return S_OK;
} else if (iid == __uuidof(IUnknown)) {
*ppObject =
static_cast<IUnknown*>(static_cast<IDWriteTextAnalysisSource*>(this));
return S_OK;
} else {
return E_NOINTERFACE;
}
}
IFACEMETHOD_(ULONG, AddRef)()
{
return 1;
}
IFACEMETHOD_(ULONG, Release)()
{
return 1;
}
// A single contiguous run of characters containing the same analysis
// results.
struct Run
{
UINT32 mTextStart; // starting text position of this run
UINT32 mTextLength; // number of contiguous code units covered
UINT32 mGlyphStart; // starting glyph in the glyphs array
UINT32 mGlyphCount; // number of glyphs associated with this run of
// text
DWRITE_SCRIPT_ANALYSIS mScript;
UINT8 mBidiLevel;
bool mIsSideways;
inline bool ContainsTextPosition(UINT32 aTextPosition) const
{
return aTextPosition >= mTextStart
&& aTextPosition < mTextStart + mTextLength;
}
Run *nextRun;
};
public:
TextAnalysis(const wchar_t* text,
UINT32 textLength,
const wchar_t* localeName,
DWRITE_READING_DIRECTION readingDirection);
~TextAnalysis();
STDMETHODIMP GenerateResults(IDWriteTextAnalyzer* textAnalyzer,
Run **runHead,
DWRITE_LINE_BREAKPOINT **breakpoints);
// IDWriteTextAnalysisSource implementation
IFACEMETHODIMP GetTextAtPosition(UINT32 textPosition,
OUT WCHAR const** textString,
OUT UINT32* textLength);
IFACEMETHODIMP GetTextBeforePosition(UINT32 textPosition,
OUT WCHAR const** textString,
OUT UINT32* textLength);
IFACEMETHODIMP_(DWRITE_READING_DIRECTION)
GetParagraphReadingDirection() throw();
IFACEMETHODIMP GetLocaleName(UINT32 textPosition,
OUT UINT32* textLength,
OUT WCHAR const** localeName);
IFACEMETHODIMP
GetNumberSubstitution(UINT32 textPosition,
OUT UINT32* textLength,
OUT IDWriteNumberSubstitution** numberSubstitution);
// IDWriteTextAnalysisSink implementation
IFACEMETHODIMP
SetScriptAnalysis(UINT32 textPosition,
UINT32 textLength,
DWRITE_SCRIPT_ANALYSIS const* scriptAnalysis);
IFACEMETHODIMP
SetLineBreakpoints(UINT32 textPosition,
UINT32 textLength,
const DWRITE_LINE_BREAKPOINT* lineBreakpoints);
IFACEMETHODIMP SetBidiLevel(UINT32 textPosition,
UINT32 textLength,
UINT8 explicitLevel,
UINT8 resolvedLevel);
IFACEMETHODIMP
SetNumberSubstitution(UINT32 textPosition,
UINT32 textLength,
IDWriteNumberSubstitution* numberSubstitution);
protected:
Run *FetchNextRun(IN OUT UINT32* textLength);
void SetCurrentRun(UINT32 textPosition);
void SplitCurrentRun(UINT32 splitPosition);
protected:
// Input
// (weak references are fine here, since this class is a transient
// stack-based helper that doesn't need to copy data)
UINT32 mTextLength;
const wchar_t* mText;
const wchar_t* mLocaleName;
DWRITE_READING_DIRECTION mReadingDirection;
// Current processing state.
Run *mCurrentRun;
// Output
Run *mRunHead;
// We do not use this for now, store anyway
DWRITE_LINE_BREAKPOINT *mBreakpoints;
};
#endif /* GFX_DWRITETEXTANALYSIS_H */