зеркало из https://github.com/mozilla/gecko-dev.git
433 строки
16 KiB
C++
433 строки
16 KiB
C++
/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*-
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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 Novell code.
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*
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* The Initial Developer of the Original Code is Novell Corporation.
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* Portions created by the Initial Developer are Copyright (C) 2006
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* the Initial Developer. All Rights Reserved.
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*
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* Contributor(s):
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* robert@ocallahan.org
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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 "nsTextRunTransformations.h"
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#include "nsTextFrameUtils.h"
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#include "gfxSkipChars.h"
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#include "nsStyleConsts.h"
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#include "nsStyleContext.h"
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#include "gfxContext.h"
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#include "nsContentUtils.h"
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#include "nsUnicharUtils.h"
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#define SZLIG 0x00DF
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nsTransformedTextRun *
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nsTransformedTextRun::Create(const gfxTextRunFactory::Parameters* aParams,
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nsTransformingTextRunFactory* aFactory,
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gfxFontGroup* aFontGroup,
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const PRUnichar* aString, PRUint32 aLength,
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const PRUint32 aFlags, nsStyleContext** aStyles,
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PRBool aOwnsFactory)
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{
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NS_ASSERTION(!(aFlags & gfxTextRunFactory::TEXT_IS_8BIT),
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"didn't expect text to be marked as 8-bit here");
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// Note that AllocateStorage MAY modify the textPtr parameter,
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// if the text is not persistent and therefore a private copy is created
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const void *textPtr = aString;
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CompressedGlyph *glyphStorage = AllocateStorage(textPtr, aLength, aFlags);
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if (!glyphStorage) {
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return nsnull;
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}
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return new nsTransformedTextRun(aParams, aFactory, aFontGroup,
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static_cast<const PRUnichar*>(textPtr), aLength,
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aFlags, aStyles, aOwnsFactory, glyphStorage);
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}
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void
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nsTransformedTextRun::SetCapitalization(PRUint32 aStart, PRUint32 aLength,
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PRPackedBool* aCapitalization,
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gfxContext* aRefContext)
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{
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if (mCapitalize.IsEmpty()) {
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if (!mCapitalize.AppendElements(GetLength()))
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return;
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memset(mCapitalize.Elements(), 0, GetLength()*sizeof(PRPackedBool));
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}
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memcpy(mCapitalize.Elements() + aStart, aCapitalization, aLength*sizeof(PRPackedBool));
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mNeedsRebuild = PR_TRUE;
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}
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PRBool
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nsTransformedTextRun::SetPotentialLineBreaks(PRUint32 aStart, PRUint32 aLength,
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PRPackedBool* aBreakBefore,
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gfxContext* aRefContext)
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{
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PRBool changed = gfxTextRun::SetPotentialLineBreaks(aStart, aLength,
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aBreakBefore, aRefContext);
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if (changed) {
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mNeedsRebuild = PR_TRUE;
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}
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return changed;
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}
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nsTransformedTextRun*
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nsTransformingTextRunFactory::MakeTextRun(const PRUnichar* aString, PRUint32 aLength,
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const gfxTextRunFactory::Parameters* aParams,
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gfxFontGroup* aFontGroup, PRUint32 aFlags,
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nsStyleContext** aStyles, PRBool aOwnsFactory)
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{
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return nsTransformedTextRun::Create(aParams, this, aFontGroup,
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aString, aLength, aFlags, aStyles, aOwnsFactory);
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}
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nsTransformedTextRun*
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nsTransformingTextRunFactory::MakeTextRun(const PRUint8* aString, PRUint32 aLength,
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const gfxTextRunFactory::Parameters* aParams,
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gfxFontGroup* aFontGroup, PRUint32 aFlags,
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nsStyleContext** aStyles, PRBool aOwnsFactory)
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{
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// We'll only have a Unicode code path to minimize the amount of code needed
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// for these rarely used features
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NS_ConvertASCIItoUTF16 unicodeString(reinterpret_cast<const char*>(aString), aLength);
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return MakeTextRun(unicodeString.get(), aLength, aParams, aFontGroup,
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aFlags & ~(gfxFontGroup::TEXT_IS_PERSISTENT | gfxFontGroup::TEXT_IS_8BIT),
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aStyles, aOwnsFactory);
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}
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/**
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* Copy a given textrun, but merge certain characters into a single logical
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* character. Glyphs for a character are added to the glyph list for the previous
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* character and then the merged character is eliminated. Visually the results
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* are identical.
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*
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* This is used for text-transform:uppercase when we encounter a SZLIG,
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* whose uppercase form is "SS".
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*
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* This function is unable to merge characters when they occur in different
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* glyph runs. It's hard to see how this could happen, but if it does, we just
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* discard the characters-to-merge.
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*
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* For simplicity, this produces a textrun containing all DetailedGlyphs,
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* no simple glyphs. So don't call it unless you really have merging to do.
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*
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* @param aCharsToMerge when aCharsToMerge[i] is true, this character is
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* merged into the previous character
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*/
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static void
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MergeCharactersInTextRun(gfxTextRun* aDest, gfxTextRun* aSrc,
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PRPackedBool* aCharsToMerge)
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{
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aDest->ResetGlyphRuns();
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gfxTextRun::GlyphRunIterator iter(aSrc, 0, aSrc->GetLength());
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PRUint32 offset = 0;
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nsAutoTArray<gfxTextRun::DetailedGlyph,2> glyphs;
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while (iter.NextRun()) {
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gfxTextRun::GlyphRun* run = iter.GetGlyphRun();
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nsresult rv = aDest->AddGlyphRun(run->mFont, offset);
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if (NS_FAILED(rv))
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return;
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PRBool anyMissing = PR_FALSE;
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PRUint32 mergeRunStart = iter.GetStringStart();
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PRUint32 k;
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for (k = iter.GetStringStart(); k < iter.GetStringEnd(); ++k) {
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gfxTextRun::CompressedGlyph g = aSrc->GetCharacterGlyphs()[k];
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if (g.IsSimpleGlyph()) {
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if (!anyMissing) {
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gfxTextRun::DetailedGlyph details;
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details.mGlyphID = g.GetSimpleGlyph();
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details.mAdvance = g.GetSimpleAdvance();
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details.mXOffset = 0;
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details.mYOffset = 0;
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glyphs.AppendElement(details);
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}
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} else {
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if (g.IsMissing()) {
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anyMissing = PR_TRUE;
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glyphs.Clear();
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}
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glyphs.AppendElements(aSrc->GetDetailedGlyphs(k), g.GetGlyphCount());
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}
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// We could teach this method to handle merging of characters that aren't
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// cluster starts or ligature group starts, but this is really only used
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// to merge S's (uppercase ß), so it's not worth it.
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if (k + 1 < iter.GetStringEnd() && aCharsToMerge[k + 1]) {
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NS_ASSERTION(g.IsClusterStart() && g.IsLigatureGroupStart(),
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"Don't know how to merge this stuff");
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continue;
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}
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NS_ASSERTION(mergeRunStart == k ||
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(g.IsClusterStart() && g.IsLigatureGroupStart()),
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"Don't know how to merge this stuff");
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// If the start of the merge run is actually a character that should
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// have been merged with the previous character (this can happen
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// if there's a font change in the middle of a szlig, for example),
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// just discard the entire merge run. See comment at start of this
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// function.
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if (!aCharsToMerge[mergeRunStart]) {
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if (anyMissing) {
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g.SetMissing(glyphs.Length());
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} else {
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g.SetComplex(PR_TRUE, PR_TRUE, glyphs.Length());
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}
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aDest->SetGlyphs(offset, g, glyphs.Elements());
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++offset;
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}
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glyphs.Clear();
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anyMissing = PR_FALSE;
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mergeRunStart = k + 1;
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}
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NS_ASSERTION(glyphs.Length() == 0,
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"Leftover glyphs, don't request merging of the last character with its next!");
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}
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NS_ASSERTION(offset == aDest->GetLength(), "Bad offset calculations");
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}
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static gfxTextRunFactory::Parameters
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GetParametersForInner(nsTransformedTextRun* aTextRun, PRUint32* aFlags,
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gfxContext* aRefContext)
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{
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gfxTextRunFactory::Parameters params =
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{ aRefContext, nsnull, nsnull,
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nsnull, 0, aTextRun->GetAppUnitsPerDevUnit()
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};
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*aFlags = aTextRun->GetFlags() & ~gfxFontGroup::TEXT_IS_PERSISTENT;
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return params;
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}
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void
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nsFontVariantTextRunFactory::RebuildTextRun(nsTransformedTextRun* aTextRun,
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gfxContext* aRefContext)
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{
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gfxFontGroup* fontGroup = aTextRun->GetFontGroup();
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gfxFontStyle fontStyle = *fontGroup->GetStyle();
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fontStyle.size *= 0.8;
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nsRefPtr<gfxFontGroup> smallFont = fontGroup->Copy(&fontStyle);
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if (!smallFont)
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return;
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PRUint32 flags;
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gfxTextRunFactory::Parameters innerParams =
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GetParametersForInner(aTextRun, &flags, aRefContext);
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PRUint32 length = aTextRun->GetLength();
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const PRUnichar* str = aTextRun->GetTextUnicode();
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nsRefPtr<nsStyleContext>* styles = aTextRun->mStyles.Elements();
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// Create a textrun so we can check cluster-start properties
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gfxTextRunCache::AutoTextRun inner(
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gfxTextRunCache::MakeTextRun(str, length, fontGroup, &innerParams, flags));
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if (!inner.get())
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return;
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nsCaseTransformTextRunFactory uppercaseFactory(nsnull, PR_TRUE);
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aTextRun->ResetGlyphRuns();
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PRUint32 runStart = 0;
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PRBool runIsLowercase = PR_FALSE;
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nsAutoTArray<nsStyleContext*,50> styleArray;
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nsAutoTArray<PRPackedBool,50> canBreakBeforeArray;
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PRUint32 i;
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for (i = 0; i <= length; ++i) {
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PRBool isLowercase = PR_FALSE;
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if (i < length) {
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// Characters that aren't the start of a cluster are ignored here. They
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// get added to whatever lowercase/non-lowercase run we're in.
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if (!inner->IsClusterStart(i)) {
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isLowercase = runIsLowercase;
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} else {
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if (styles[i]->GetStyleFont()->mFont.variant == NS_STYLE_FONT_VARIANT_SMALL_CAPS) {
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PRUnichar ch = str[i];
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PRUnichar ch2;
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ch2 = ToUpperCase(ch);
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isLowercase = ch != ch2 || ch == SZLIG;
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} else {
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// Don't transform the character! I.e., pretend that it's not lowercase
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}
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}
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}
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if ((i == length || runIsLowercase != isLowercase) && runStart < i) {
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nsAutoPtr<nsTransformedTextRun> transformedChild;
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gfxTextRunCache::AutoTextRun cachedChild;
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gfxTextRun* child;
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if (runIsLowercase) {
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transformedChild = uppercaseFactory.MakeTextRun(str + runStart, i - runStart,
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&innerParams, smallFont, flags, styleArray.Elements(), PR_FALSE);
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child = transformedChild;
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} else {
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cachedChild =
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gfxTextRunCache::MakeTextRun(str + runStart, i - runStart, fontGroup,
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&innerParams, flags);
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child = cachedChild.get();
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}
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if (!child)
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return;
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// Copy potential linebreaks into child so they're preserved
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// (and also child will be shaped appropriately)
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NS_ASSERTION(canBreakBeforeArray.Length() == i - runStart,
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"lost some break-before values?");
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child->SetPotentialLineBreaks(0, canBreakBeforeArray.Length(),
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canBreakBeforeArray.Elements(), aRefContext);
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if (transformedChild) {
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transformedChild->FinishSettingProperties(aRefContext);
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}
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aTextRun->CopyGlyphDataFrom(child, 0, child->GetLength(), runStart);
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runStart = i;
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styleArray.Clear();
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canBreakBeforeArray.Clear();
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}
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if (i < length) {
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runIsLowercase = isLowercase;
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styleArray.AppendElement(styles[i]);
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canBreakBeforeArray.AppendElement(aTextRun->CanBreakLineBefore(i));
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}
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}
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}
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void
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nsCaseTransformTextRunFactory::RebuildTextRun(nsTransformedTextRun* aTextRun,
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gfxContext* aRefContext)
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{
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PRUint32 length = aTextRun->GetLength();
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const PRUnichar* str = aTextRun->GetTextUnicode();
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nsRefPtr<nsStyleContext>* styles = aTextRun->mStyles.Elements();
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nsAutoString convertedString;
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nsAutoTArray<PRPackedBool,50> charsToMergeArray;
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nsAutoTArray<nsStyleContext*,50> styleArray;
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nsAutoTArray<PRPackedBool,50> canBreakBeforeArray;
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PRUint32 extraCharsCount = 0;
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PRUint32 i;
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for (i = 0; i < length; ++i) {
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PRUnichar ch = str[i];
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charsToMergeArray.AppendElement(PR_FALSE);
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styleArray.AppendElement(styles[i]);
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canBreakBeforeArray.AppendElement(aTextRun->CanBreakLineBefore(i));
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PRUint8 style = mAllUppercase ? NS_STYLE_TEXT_TRANSFORM_UPPERCASE
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: styles[i]->GetStyleText()->mTextTransform;
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PRBool extraChar = PR_FALSE;
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switch (style) {
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case NS_STYLE_TEXT_TRANSFORM_LOWERCASE:
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ch = ToLowerCase(ch);
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break;
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case NS_STYLE_TEXT_TRANSFORM_UPPERCASE:
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if (ch == SZLIG) {
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convertedString.Append('S');
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extraChar = PR_TRUE;
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ch = 'S';
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} else {
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ch = ToUpperCase(ch);
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}
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break;
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case NS_STYLE_TEXT_TRANSFORM_CAPITALIZE:
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if (i < aTextRun->mCapitalize.Length() && aTextRun->mCapitalize[i]) {
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if (ch == SZLIG) {
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convertedString.Append('S');
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extraChar = PR_TRUE;
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ch = 'S';
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} else {
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ch = ToTitleCase(ch);
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}
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}
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break;
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default:
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break;
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}
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convertedString.Append(ch);
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if (extraChar) {
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++extraCharsCount;
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charsToMergeArray.AppendElement(PR_TRUE);
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styleArray.AppendElement(styles[i]);
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canBreakBeforeArray.AppendElement(PR_FALSE);
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}
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}
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PRUint32 flags;
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gfxTextRunFactory::Parameters innerParams =
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GetParametersForInner(aTextRun, &flags, aRefContext);
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gfxFontGroup* fontGroup = aTextRun->GetFontGroup();
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nsAutoPtr<nsTransformedTextRun> transformedChild;
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gfxTextRunCache::AutoTextRun cachedChild;
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gfxTextRun* child;
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if (mInnerTransformingTextRunFactory) {
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transformedChild = mInnerTransformingTextRunFactory->MakeTextRun(
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convertedString.BeginReading(), convertedString.Length(),
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&innerParams, fontGroup, flags, styleArray.Elements(), PR_FALSE);
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child = transformedChild.get();
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} else {
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cachedChild = gfxTextRunCache::MakeTextRun(
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convertedString.BeginReading(), convertedString.Length(), fontGroup,
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&innerParams, flags);
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child = cachedChild.get();
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}
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if (!child)
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return;
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// Copy potential linebreaks into child so they're preserved
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// (and also child will be shaped appropriately)
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NS_ASSERTION(convertedString.Length() == canBreakBeforeArray.Length(),
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"Dropped characters or break-before values somewhere!");
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child->SetPotentialLineBreaks(0, canBreakBeforeArray.Length(),
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canBreakBeforeArray.Elements(), aRefContext);
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if (transformedChild) {
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transformedChild->FinishSettingProperties(aRefContext);
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}
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if (extraCharsCount > 0) {
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// Now merge multiple characters into one multi-glyph character as required
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MergeCharactersInTextRun(aTextRun, child, charsToMergeArray.Elements());
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} else {
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// No merging to do, so just copy; this produces a more optimized textrun.
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// We can't steal the data because the child may be cached and stealing
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// the data would break the cache.
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aTextRun->ResetGlyphRuns();
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aTextRun->CopyGlyphDataFrom(child, 0, child->GetLength(), 0);
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}
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}
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