зеркало из https://github.com/mozilla/gecko-dev.git
290 строки
9.0 KiB
C++
290 строки
9.0 KiB
C++
/* -*- Mode: C++; tab-width: 20; indent-tabs-mode: nil; c-basic-offset: 4 -*-
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* ***** BEGIN LICENSE BLOCK *****
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* Version: MPL 1.1/GPL 2.0/LGPL 2.1
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*
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* The contents of this file are subject to the Mozilla Public License Version
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* 1.1 (the "License"); you may not use this file except in compliance with
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* the License. You may obtain a copy of the License at
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* http://www.mozilla.org/MPL/
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*
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* Software distributed under the License is distributed on an "AS IS" basis,
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* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
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* for the specific language governing rights and limitations under the
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* License.
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*
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* The Original Code is Mozilla Foundation code.
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*
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* The Initial Developer of the Original Code is Mozilla Foundation.
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* Portions created by the Initial Developer are Copyright (C) 2010
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* the Initial Developer. All Rights Reserved.
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*
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* Contributor(s):
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* Bas Schouten <bschouten@mozilla.com>
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*
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* Alternatively, the contents of this file may be used under the terms of
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* either the GNU General Public License Version 2 or later (the "GPL"), or
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* the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
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* in which case the provisions of the GPL or the LGPL are applicable instead
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* of those above. If you wish to allow use of your version of this file only
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* under the terms of either the GPL or the LGPL, and not to allow others to
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* use your version of this file under the terms of the MPL, indicate your
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* decision by deleting the provisions above and replace them with the notice
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* and other provisions required by the GPL or the LGPL. If you do not delete
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* the provisions above, a recipient may use your version of this file under
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* the terms of any one of the MPL, the GPL or the LGPL.
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*
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* ***** END LICENSE BLOCK ***** */
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#include "gfxDWriteTextAnalysis.h"
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TextAnalysis::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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: mText(text)
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, mTextLength(textLength)
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, mLocaleName(localeName)
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, mReadingDirection(readingDirection)
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, mCurrentRun(NULL)
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{
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}
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TextAnalysis::~TextAnalysis()
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{
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// delete runs, except mRunHead which is part of the TextAnalysis object
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for (Run *run = mRunHead.nextRun; run;) {
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Run *origRun = run;
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run = run->nextRun;
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delete origRun;
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}
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}
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STDMETHODIMP
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TextAnalysis::GenerateResults(IDWriteTextAnalyzer* textAnalyzer,
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OUT Run **runHead)
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{
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// Analyzes the text using the script analyzer and returns
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// the result as a series of runs.
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HRESULT hr = S_OK;
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// Initially start out with one result that covers the entire range.
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// This result will be subdivided by the analysis processes.
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mRunHead.mTextStart = 0;
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mRunHead.mTextLength = mTextLength;
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mRunHead.mBidiLevel =
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(mReadingDirection == DWRITE_READING_DIRECTION_RIGHT_TO_LEFT);
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mRunHead.nextRun = NULL;
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mCurrentRun = &mRunHead;
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// Call each of the analyzers in sequence, recording their results.
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if (SUCCEEDED(hr = textAnalyzer->AnalyzeScript(this,
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0,
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mTextLength,
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this))) {
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*runHead = &mRunHead;
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}
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return hr;
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}
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////////////////////////////////////////////////////////////////////////////////
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// IDWriteTextAnalysisSource source implementation
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IFACEMETHODIMP
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TextAnalysis::GetTextAtPosition(UINT32 textPosition,
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OUT WCHAR const** textString,
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OUT UINT32* textLength)
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{
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if (textPosition >= mTextLength) {
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// No text at this position, valid query though.
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*textString = NULL;
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*textLength = 0;
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} else {
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*textString = mText + textPosition;
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*textLength = mTextLength - textPosition;
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}
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return S_OK;
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}
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IFACEMETHODIMP
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TextAnalysis::GetTextBeforePosition(UINT32 textPosition,
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OUT WCHAR const** textString,
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OUT UINT32* textLength)
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{
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if (textPosition == 0 || textPosition > mTextLength) {
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// Either there is no text before here (== 0), or this
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// is an invalid position. The query is considered valid thouh.
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*textString = NULL;
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*textLength = 0;
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} else {
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*textString = mText;
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*textLength = textPosition;
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}
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return S_OK;
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}
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DWRITE_READING_DIRECTION STDMETHODCALLTYPE
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TextAnalysis::GetParagraphReadingDirection()
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{
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// We support only a single reading direction.
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return mReadingDirection;
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}
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IFACEMETHODIMP
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TextAnalysis::GetLocaleName(UINT32 textPosition,
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OUT UINT32* textLength,
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OUT WCHAR const** localeName)
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{
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// Single locale name is used, valid until the end of the string.
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*localeName = mLocaleName;
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*textLength = mTextLength - textPosition;
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return S_OK;
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}
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IFACEMETHODIMP
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TextAnalysis::GetNumberSubstitution(UINT32 textPosition,
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OUT UINT32* textLength,
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OUT IDWriteNumberSubstitution** numberSubstitution)
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{
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// We do not support number substitution.
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*numberSubstitution = NULL;
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*textLength = mTextLength - textPosition;
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return S_OK;
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}
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////////////////////////////////////////////////////////////////////////////////
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// IDWriteTextAnalysisSink implementation
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IFACEMETHODIMP
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TextAnalysis::SetLineBreakpoints(UINT32 textPosition,
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UINT32 textLength,
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DWRITE_LINE_BREAKPOINT const* lineBreakpoints)
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{
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// We don't use this for now.
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return S_OK;
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}
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IFACEMETHODIMP
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TextAnalysis::SetScriptAnalysis(UINT32 textPosition,
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UINT32 textLength,
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DWRITE_SCRIPT_ANALYSIS const* scriptAnalysis)
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{
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SetCurrentRun(textPosition);
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SplitCurrentRun(textPosition);
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while (textLength > 0) {
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Run *run = FetchNextRun(&textLength);
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run->mScript = *scriptAnalysis;
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}
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return S_OK;
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}
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IFACEMETHODIMP
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TextAnalysis::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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{
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// We don't use this for now.
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return S_OK;
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}
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IFACEMETHODIMP
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TextAnalysis::SetNumberSubstitution(UINT32 textPosition,
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UINT32 textLength,
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IDWriteNumberSubstitution* numberSubstitution)
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{
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// We don't use this for now.
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return S_OK;
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}
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////////////////////////////////////////////////////////////////////////////////
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// Run modification.
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TextAnalysis::Run *
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TextAnalysis::FetchNextRun(IN OUT UINT32* textLength)
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{
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// Used by the sink setters, this returns a reference to the next run.
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// Position and length are adjusted to now point after the current run
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// being returned.
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Run *origRun = mCurrentRun;
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// Split the tail if needed (the length remaining is less than the
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// current run's size).
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if (*textLength < mCurrentRun->mTextLength) {
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SplitCurrentRun(mCurrentRun->mTextStart + *textLength);
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} else {
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// Just advance the current run.
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mCurrentRun = mCurrentRun->nextRun;
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}
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*textLength -= origRun->mTextLength;
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// Return a reference to the run that was just current.
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return origRun;
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}
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void TextAnalysis::SetCurrentRun(UINT32 textPosition)
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{
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// Move the current run to the given position.
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// Since the analyzers generally return results in a forward manner,
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// this will usually just return early. If not, find the
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// corresponding run for the text position.
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if (mCurrentRun && mCurrentRun->ContainsTextPosition(textPosition)) {
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return;
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}
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for (Run *run = &mRunHead; run; run = run->nextRun) {
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if (run->ContainsTextPosition(textPosition)) {
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mCurrentRun = run;
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return;
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}
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}
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NS_NOTREACHED("We should always be able to find the text position in one \
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of our runs");
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}
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void TextAnalysis::SplitCurrentRun(UINT32 splitPosition)
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{
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if (!mCurrentRun) {
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NS_ASSERTION(false, "SplitCurrentRun called without current run.");
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// Shouldn't be calling this when no current run is set!
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return;
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}
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// Split the current run.
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if (splitPosition <= mCurrentRun->mTextStart) {
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// No need to split, already the start of a run
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// or before it. Usually the first.
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return;
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}
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Run *newRun = new Run;
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*newRun = *mCurrentRun;
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// Insert the new run in our linked list.
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newRun->nextRun = mCurrentRun->nextRun;
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mCurrentRun->nextRun = newRun;
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// Adjust runs' text positions and lengths.
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UINT32 splitPoint = splitPosition - mCurrentRun->mTextStart;
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newRun->mTextStart += splitPoint;
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newRun->mTextLength -= splitPoint;
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mCurrentRun->mTextLength = splitPoint;
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mCurrentRun = newRun;
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}
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