/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- * ***** 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 Novell code. * * The Initial Developer of the Original Code is Novell Corporation. * Portions created by the Initial Developer are Copyright (C) 2006 * the Initial Developer. All Rights Reserved. * * Contributor(s): * robert@ocallahan.org * Ehsan Akhgari * * 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 NSTEXTFRAMEUTILS_H_ #define NSTEXTFRAMEUTILS_H_ #include "gfxFont.h" #include "gfxSkipChars.h" #include "nsTextFragment.h" class nsIContent; struct nsStyleText; #define BIG_TEXT_NODE_SIZE 4096 #define CH_NBSP 160 #define CH_SHY 173 #define CH_CJKSP 12288 // U+3000 IDEOGRAPHIC SPACE (CJK Full-Width Space) #define CH_LRM 8206 // #define CH_RLM 8207 // #define CH_LRE 8234 // #define CH_RLO 8238 // class nsTextFrameUtils { public: // These constants are used as textrun flags for textframe textruns. enum { // The following flags are set by TransformText // the text has at least one untransformed tab character TEXT_HAS_TAB = 0x010000, // the original text has at least one soft hyphen character TEXT_HAS_SHY = 0x020000, TEXT_WAS_TRANSFORMED = 0x040000, TEXT_UNUSED_FLAG = 0x080000, // The following flags are set by nsTextFrame TEXT_IS_SIMPLE_FLOW = 0x100000, TEXT_INCOMING_WHITESPACE = 0x200000, TEXT_TRAILING_WHITESPACE = 0x400000, TEXT_COMPRESSED_LEADING_WHITESPACE = 0x800000, TEXT_NO_BREAKS = 0x1000000, TEXT_IS_TRANSFORMED = 0x2000000, // This gets set if there's a break opportunity at the end of the textrun. // We normally don't use this break opportunity because the following text // will have a break opportunity at the start, but it's useful for line // layout to know about it in case the following content is not text TEXT_HAS_TRAILING_BREAK = 0x4000000 // The following are defined by gfxTextRunWordCache rather than here, // so that it also has access to the _INCOMING flag // TEXT_TRAILING_ARABICCHAR // TEXT_INCOMING_ARABICCHAR }; // These constants are used in TransformText to represent context information // from previous textruns. enum { INCOMING_NONE = 0, INCOMING_WHITESPACE = 1, INCOMING_ARABICCHAR = 2 }; /** * Returns true if aChars/aLength are something that make a space * character not be whitespace when they follow the space character. * For now, this is true if and only if aChars starts with a ZWJ. (This * is what Uniscribe assumes.) */ static bool IsSpaceCombiningSequenceTail(const PRUnichar* aChars, PRInt32 aLength) { return aLength > 0 && aChars[0] == 0x200D; // ZWJ } enum CompressionMode { COMPRESS_NONE, COMPRESS_WHITESPACE, COMPRESS_WHITESPACE_NEWLINE }; /** * Create a text run from a run of Unicode text. The text may have whitespace * compressed. A preformatted tab is sent to the text run as a single space. * (Tab spacing must be performed by textframe later.) Certain other * characters are discarded. * * @param aCompressWhitespace control what is compressed to a * single space character: no compression, compress spaces (not followed * by combining mark) and tabs, and compress those plus newlines. * @param aIncomingFlags a flag indicating whether there was whitespace * or an Arabic character preceding this text. We set it to indicate if * there's an Arabic character or whitespace preceding the end of this text. */ static PRUnichar* TransformText(const PRUnichar* aText, PRUint32 aLength, PRUnichar* aOutput, CompressionMode aCompression, PRUint8 * aIncomingFlags, gfxSkipCharsBuilder* aSkipChars, PRUint32* aAnalysisFlags); static PRUint8* TransformText(const PRUint8* aText, PRUint32 aLength, PRUint8* aOutput, CompressionMode aCompression, PRUint8 * aIncomingFlags, gfxSkipCharsBuilder* aSkipChars, PRUint32* aAnalysisFlags); static void AppendLineBreakOffset(nsTArray* aArray, PRUint32 aOffset) { if (aArray->Length() > 0 && (*aArray)[aArray->Length() - 1] == aOffset) return; aArray->AppendElement(aOffset); } static PRUint32 ComputeApproximateLengthWithWhitespaceCompression(nsIContent *aContent, const nsStyleText *aStyleText); }; class nsSkipCharsRunIterator { public: enum LengthMode { LENGTH_UNSKIPPED_ONLY = false, LENGTH_INCLUDES_SKIPPED = true }; nsSkipCharsRunIterator(const gfxSkipCharsIterator& aStart, LengthMode aLengthIncludesSkipped, PRUint32 aLength) : mIterator(aStart), mRemainingLength(aLength), mRunLength(0), mVisitSkipped(false), mLengthIncludesSkipped(aLengthIncludesSkipped) { } void SetVisitSkipped() { mVisitSkipped = true; } void SetOriginalOffset(PRInt32 aOffset) { mIterator.SetOriginalOffset(aOffset); } void SetSkippedOffset(PRUint32 aOffset) { mIterator.SetSkippedOffset(aOffset); } // guaranteed to return only positive-length runs bool NextRun(); bool IsSkipped() const { return mSkipped; } // Always returns something > 0 PRInt32 GetRunLength() const { return mRunLength; } const gfxSkipCharsIterator& GetPos() const { return mIterator; } PRInt32 GetOriginalOffset() const { return mIterator.GetOriginalOffset(); } PRUint32 GetSkippedOffset() const { return mIterator.GetSkippedOffset(); } private: gfxSkipCharsIterator mIterator; PRInt32 mRemainingLength; PRInt32 mRunLength; bool mSkipped; bool mVisitSkipped; bool mLengthIncludesSkipped; }; #endif /*NSTEXTFRAMEUTILS_H_*/