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665 lines
29 KiB
C++
665 lines
29 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 Corporation 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) 2006-2009
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* the Initial Developer. All Rights Reserved.
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*
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* Contributor(s):
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* Vladimir Vukicevic <vladimir@pobox.com>
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* Masayuki Nakano <masayuki@d-toybox.com>
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* John Daggett <jdaggett@mozilla.com>
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* Jonathan Kew <jfkthame@gmail.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 "prtypes.h"
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#include "nsAlgorithm.h"
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#include "prmem.h"
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#include "nsString.h"
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#include "nsBidiUtils.h"
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#include "gfxTypes.h"
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#include "nsPromiseFlatString.h"
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#include "gfxContext.h"
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#include "gfxPlatform.h"
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#include "gfxPlatformMac.h"
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#include "gfxCoreTextShaper.h"
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#include "gfxMacFont.h"
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#include "gfxFontTest.h"
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#include "gfxFontUtils.h"
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#include "gfxQuartzSurface.h"
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#include "gfxMacPlatformFontList.h"
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#include "gfxUserFontSet.h"
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#include "nsUnicodeRange.h"
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// standard font descriptors that we construct the first time they're needed
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CTFontDescriptorRef gfxCoreTextShaper::sDefaultFeaturesDescriptor = NULL;
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CTFontDescriptorRef gfxCoreTextShaper::sDisableLigaturesDescriptor = NULL;
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gfxCoreTextShaper::gfxCoreTextShaper(gfxMacFont *aFont)
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: gfxFontShaper(aFont)
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{
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// Create our CTFontRef
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mCTFont = ::CTFontCreateWithPlatformFont(aFont->GetATSFontRef(),
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aFont->GetAdjustedSize(),
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NULL,
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GetDefaultFeaturesDescriptor());
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// Set up the default attribute dictionary that we will need each time we create a CFAttributedString
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mAttributesDict = ::CFDictionaryCreate(kCFAllocatorDefault,
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(const void**) &kCTFontAttributeName,
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(const void**) &mCTFont,
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1, // count of attributes
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&kCFTypeDictionaryKeyCallBacks,
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&kCFTypeDictionaryValueCallBacks);
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}
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gfxCoreTextShaper::~gfxCoreTextShaper()
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{
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if (mAttributesDict) {
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::CFRelease(mAttributesDict);
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}
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if (mCTFont) {
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::CFRelease(mCTFont);
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}
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}
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PRBool
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gfxCoreTextShaper::InitTextRun(gfxContext *aContext,
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gfxTextRun *aTextRun,
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const PRUnichar *aString,
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PRUint32 aRunStart,
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PRUint32 aRunLength,
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PRInt32 aRunScript)
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{
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// aRunStart and aRunLength define the section of the textRun and of aString
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// that is to be drawn with this particular font
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PRBool disableLigatures = (aTextRun->GetFlags() & gfxTextRunFactory::TEXT_DISABLE_OPTIONAL_LIGATURES) != 0;
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// Create a CFAttributedString with text and style info, so we can use CoreText to lay it out.
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PRBool isRTL = aTextRun->IsRightToLeft();
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// we need to bidi-wrap the text if the run is RTL,
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// or if it is an LTR run but may contain (overridden) RTL chars
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PRBool bidiWrap = isRTL;
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if (!bidiWrap && (aTextRun->GetFlags() & gfxTextRunFactory::TEXT_IS_8BIT) == 0) {
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PRUint32 i;
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for (i = aRunStart; i < aRunStart + aRunLength; ++i) {
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if (gfxFontUtils::PotentialRTLChar(aString[i])) {
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bidiWrap = PR_TRUE;
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break;
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}
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}
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}
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// If there's a possibility of any bidi, we wrap the text with direction overrides
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// to ensure neutrals or characters that were bidi-overridden in HTML behave properly.
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const UniChar beginLTR[] = { 0x202d, 0x20 };
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const UniChar beginRTL[] = { 0x202e, 0x20 };
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const UniChar endBidiWrap[] = { 0x20, 0x2e, 0x202c };
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PRUint32 startOffset;
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CFStringRef stringObj;
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if (bidiWrap) {
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startOffset = isRTL ?
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sizeof(beginRTL) / sizeof(beginRTL[0]) : sizeof(beginLTR) / sizeof(beginLTR[0]);
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CFMutableStringRef mutableString =
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::CFStringCreateMutable(kCFAllocatorDefault,
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aRunLength + startOffset +
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sizeof(endBidiWrap) / sizeof(endBidiWrap[0]));
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::CFStringAppendCharacters(mutableString,
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isRTL ? beginRTL : beginLTR,
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startOffset);
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::CFStringAppendCharacters(mutableString,
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aString + aRunStart, aRunLength);
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::CFStringAppendCharacters(mutableString,
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endBidiWrap,
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sizeof(endBidiWrap) / sizeof(endBidiWrap[0]));
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stringObj = mutableString;
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} else {
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startOffset = 0;
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stringObj = ::CFStringCreateWithCharactersNoCopy(kCFAllocatorDefault,
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aString + aRunStart,
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aRunLength,
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kCFAllocatorNull);
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}
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CFDictionaryRef attrObj;
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if (disableLigatures) {
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// For letterspacing (or maybe other situations) we need to make a copy of the CTFont
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// with the ligature feature disabled
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gfxMacFont *font = static_cast<gfxMacFont*>(mFont);
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CTFontRef ctFont =
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CreateCTFontWithDisabledLigatures(font->GetATSFontRef(),
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::CTFontGetSize(mCTFont));
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attrObj =
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::CFDictionaryCreate(kCFAllocatorDefault,
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(const void**) &kCTFontAttributeName,
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(const void**) &ctFont,
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1, // count of attributes
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&kCFTypeDictionaryKeyCallBacks,
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&kCFTypeDictionaryValueCallBacks);
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// Having created the dict, we're finished with our ligature-disabled CTFontRef
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::CFRelease(ctFont);
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} else {
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attrObj = mAttributesDict;
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::CFRetain(attrObj);
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}
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// Now we can create an attributed string
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CFAttributedStringRef attrStringObj =
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::CFAttributedStringCreate(kCFAllocatorDefault, stringObj, attrObj);
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::CFRelease(stringObj);
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::CFRelease(attrObj);
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// Create the CoreText line from our string, then we're done with it
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CTLineRef line = ::CTLineCreateWithAttributedString(attrStringObj);
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::CFRelease(attrStringObj);
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// and finally retrieve the glyph data and store into the gfxTextRun
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CFArrayRef glyphRuns = ::CTLineGetGlyphRuns(line);
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PRUint32 numRuns = ::CFArrayGetCount(glyphRuns);
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// Iterate through the glyph runs.
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// Note that this includes the bidi wrapper, so we have to be careful
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// not to include the extra glyphs from there
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PRBool success = PR_TRUE;
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for (PRUint32 runIndex = 0; runIndex < numRuns; runIndex++) {
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CTRunRef aCTRun = (CTRunRef)::CFArrayGetValueAtIndex(glyphRuns, runIndex);
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if (SetGlyphsFromRun(aTextRun, aCTRun, startOffset,
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aRunStart, aRunLength) != NS_OK) {
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success = PR_FALSE;
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break;
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}
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}
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::CFRelease(line);
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return success;
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}
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#define SMALL_GLYPH_RUN 128 // preallocated size of our auto arrays for per-glyph data;
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// some testing indicates that 90%+ of glyph runs will fit
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// without requiring a separate allocation
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nsresult
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gfxCoreTextShaper::SetGlyphsFromRun(gfxTextRun *aTextRun,
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CTRunRef aCTRun,
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PRInt32 aStringOffset, // offset in the string used to build the CTLine
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PRInt32 aRunStart, // starting offset of this font run in the gfxTextRun
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PRInt32 aRunLength) // length of this font run in characters
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{
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// The textRun has been bidi-wrapped; aStringOffset is the number
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// of chars at the beginning of the CTLine that we should skip.
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// aRunStart and aRunLength define the range of characters
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// within the textRun that are "real" data we need to handle.
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// aCTRun is a glyph run from the CoreText layout process.
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PRBool isLTR = !aTextRun->IsRightToLeft();
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PRInt32 direction = isLTR ? 1 : -1;
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PRInt32 numGlyphs = ::CTRunGetGlyphCount(aCTRun);
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if (numGlyphs == 0) {
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return NS_OK;
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}
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// character offsets get really confusing here, as we have to keep track of
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// (a) the text in the actual textRun we're constructing
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// (b) the "font run" being rendered with the current font, defined by aRunStart and aRunLength
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// parameters to InitTextRun
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// (c) the string that was handed to CoreText, which contains the text of the font run
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// plus directional-override padding
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// (d) the CTRun currently being processed, which may be a sub-run of the CoreText line
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// (but may extend beyond the actual font run into the bidi wrapping text).
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// aStringOffset tells us how many initial characters of the line to ignore.
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// get the source string range within the CTLine's text
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CFRange stringRange = ::CTRunGetStringRange(aCTRun);
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// skip the run if it is entirely outside the actual range of the font run
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if (stringRange.location - aStringOffset + stringRange.length <= 0 ||
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stringRange.location - aStringOffset >= aRunLength) {
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return NS_OK;
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}
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// retrieve the laid-out glyph data from the CTRun
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nsAutoArrayPtr<CGGlyph> glyphsArray;
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nsAutoArrayPtr<CGPoint> positionsArray;
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nsAutoArrayPtr<CFIndex> glyphToCharArray;
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const CGGlyph* glyphs = NULL;
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const CGPoint* positions = NULL;
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const CFIndex* glyphToChar = NULL;
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// Testing indicates that CTRunGetGlyphsPtr (almost?) always succeeds,
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// and so allocating a new array and copying data with CTRunGetGlyphs
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// will be extremely rare.
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// If this were not the case, we could use an nsAutoTArray<> to
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// try and avoid the heap allocation for small runs.
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// It's possible that some future change to CoreText will mean that
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// CTRunGetGlyphsPtr fails more often; if this happens, nsAutoTArray<>
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// may become an attractive option.
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glyphs = ::CTRunGetGlyphsPtr(aCTRun);
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if (!glyphs) {
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glyphsArray = new (std::nothrow) CGGlyph[numGlyphs];
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if (!glyphsArray) {
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return NS_ERROR_OUT_OF_MEMORY;
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}
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::CTRunGetGlyphs(aCTRun, ::CFRangeMake(0, 0), glyphsArray.get());
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glyphs = glyphsArray.get();
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}
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positions = ::CTRunGetPositionsPtr(aCTRun);
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if (!positions) {
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positionsArray = new (std::nothrow) CGPoint[numGlyphs];
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if (!positionsArray) {
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return NS_ERROR_OUT_OF_MEMORY;
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}
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::CTRunGetPositions(aCTRun, ::CFRangeMake(0, 0), positionsArray.get());
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positions = positionsArray.get();
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}
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// Remember that the glyphToChar indices relate to the CoreText line
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// not to the beginning of the textRun, the font run, or the stringRange of the glyph run
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glyphToChar = ::CTRunGetStringIndicesPtr(aCTRun);
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if (!glyphToChar) {
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glyphToCharArray = new (std::nothrow) CFIndex[numGlyphs];
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if (!glyphToCharArray) {
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return NS_ERROR_OUT_OF_MEMORY;
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}
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::CTRunGetStringIndices(aCTRun, ::CFRangeMake(0, 0), glyphToCharArray.get());
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glyphToChar = glyphToCharArray.get();
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}
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double runWidth = ::CTRunGetTypographicBounds(aCTRun, ::CFRangeMake(0, 0), NULL, NULL, NULL);
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nsAutoTArray<gfxTextRun::DetailedGlyph,1> detailedGlyphs;
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gfxTextRun::CompressedGlyph g;
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const PRUint32 appUnitsPerDevUnit = aTextRun->GetAppUnitsPerDevUnit();
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// CoreText gives us the glyphindex-to-charindex mapping, which relates each glyph
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// to a source text character; we also need the charindex-to-glyphindex mapping to
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// find the glyph for a given char. Note that some chars may not map to any glyph
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// (ligature continuations), and some may map to several glyphs (eg Indic split vowels).
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// We set the glyph index to NO_GLYPH for chars that have no associated glyph, and we
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// record the last glyph index for cases where the char maps to several glyphs,
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// so that our clumping will include all the glyph fragments for the character.
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// The charToGlyph array is indexed by char position within the stringRange of the glyph run.
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static const PRInt32 NO_GLYPH = -1;
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nsAutoTArray<PRInt32,SMALL_GLYPH_RUN> charToGlyphArray;
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if (!charToGlyphArray.SetLength(stringRange.length)) {
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return NS_ERROR_OUT_OF_MEMORY;
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}
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PRInt32 *charToGlyph = charToGlyphArray.Elements();
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for (PRInt32 offset = 0; offset < stringRange.length; ++offset) {
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charToGlyph[offset] = NO_GLYPH;
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}
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for (PRInt32 i = 0; i < numGlyphs; ++i) {
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PRInt32 loc = glyphToChar[i] - stringRange.location;
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if (loc >= 0 && loc < stringRange.length) {
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charToGlyph[loc] = i;
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}
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}
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// Find character and glyph clumps that correspond, allowing for ligatures,
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// indic reordering, split glyphs, etc.
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//
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// The idea is that we'll find a character sequence starting at the first char of stringRange,
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// and extend it until it includes the character associated with the first glyph;
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// we also extend it as long as there are "holes" in the range of glyphs. So we
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// will eventually have a contiguous sequence of characters, starting at the beginning
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// of the range, that map to a contiguous sequence of glyphs, starting at the beginning
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// of the glyph array. That's a clump; then we update the starting positions and repeat.
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//
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// NB: In the case of RTL layouts, we iterate over the stringRange in reverse.
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//
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// This may find characters that fall outside the range aRunStart:aRunLength,
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// so we won't necessarily use everything we find here.
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PRInt32 glyphStart = 0; // looking for a clump that starts at this glyph index
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PRInt32 charStart = isLTR ?
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0 : stringRange.length-1; // and this char index (in the stringRange of the glyph run)
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while (glyphStart < numGlyphs) { // keep finding groups until all glyphs are accounted for
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PRBool inOrder = PR_TRUE;
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PRInt32 charEnd = glyphToChar[glyphStart] - stringRange.location;
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NS_ASSERTION(charEnd >= 0 && charEnd < stringRange.length,
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"glyph-to-char mapping points outside string range");
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PRInt32 glyphEnd = glyphStart;
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PRInt32 charLimit = isLTR ? stringRange.length : -1;
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do {
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// This is normally executed once for each iteration of the outer loop,
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// but in unusual cases where the character/glyph association is complex,
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// the initial character range might correspond to a non-contiguous
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// glyph range with "holes" in it. If so, we will repeat this loop to
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// extend the character range until we have a contiguous glyph sequence.
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NS_ASSERTION((direction > 0 && charEnd < charLimit) ||
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(direction < 0 && charEnd > charLimit),
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"no characters left in range?");
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charEnd += direction;
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while (charEnd != charLimit && charToGlyph[charEnd] == NO_GLYPH) {
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charEnd += direction;
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}
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// find the maximum glyph index covered by the clump so far
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for (PRInt32 i = charStart; i != charEnd; i += direction) {
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if (charToGlyph[i] != NO_GLYPH) {
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glyphEnd = NS_MAX(glyphEnd, charToGlyph[i] + 1); // update extent of glyph range
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}
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}
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if (glyphEnd == glyphStart + 1) {
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// for the common case of a single-glyph clump, we can skip the following checks
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break;
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}
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if (glyphEnd == glyphStart) {
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// no glyphs, try to extend the clump
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continue;
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}
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// check whether all glyphs in the range are associated with the characters
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// in our clump; if not, we have a discontinuous range, and should extend it
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// unless we've reached the end of the text
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PRBool allGlyphsAreWithinCluster = PR_TRUE;
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PRInt32 prevGlyphCharIndex = charStart;
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for (PRInt32 i = glyphStart; i < glyphEnd; ++i) {
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PRInt32 glyphCharIndex = glyphToChar[i] - stringRange.location;
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if (isLTR) {
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if (glyphCharIndex < charStart || glyphCharIndex >= charEnd) {
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allGlyphsAreWithinCluster = PR_FALSE;
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break;
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}
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if (glyphCharIndex < prevGlyphCharIndex) {
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inOrder = PR_FALSE;
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}
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prevGlyphCharIndex = glyphCharIndex;
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} else {
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if (glyphCharIndex > charStart || glyphCharIndex <= charEnd) {
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allGlyphsAreWithinCluster = PR_FALSE;
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break;
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}
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if (glyphCharIndex > prevGlyphCharIndex) {
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inOrder = PR_FALSE;
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}
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prevGlyphCharIndex = glyphCharIndex;
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}
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}
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if (allGlyphsAreWithinCluster) {
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break;
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}
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} while (charEnd != charLimit);
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NS_ASSERTION(glyphStart < glyphEnd, "character/glyph clump contains no glyphs!");
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NS_ASSERTION(charStart != charEnd, "character/glyph contains no characters!");
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// Now charStart..charEnd is a ligature clump, corresponding to glyphStart..glyphEnd;
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// Set baseCharIndex to the char we'll actually attach the glyphs to (1st of ligature),
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// and endCharIndex to the limit (position beyond the last char),
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// adjusting for the offset of the stringRange relative to the textRun.
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PRInt32 baseCharIndex, endCharIndex;
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if (isLTR) {
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while (charEnd < stringRange.length && charToGlyph[charEnd] == NO_GLYPH) {
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charEnd++;
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}
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baseCharIndex = charStart + stringRange.location - aStringOffset + aRunStart;
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endCharIndex = charEnd + stringRange.location - aStringOffset + aRunStart;
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} else {
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while (charEnd >= 0 && charToGlyph[charEnd] == NO_GLYPH) {
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charEnd--;
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}
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baseCharIndex = charEnd + stringRange.location - aStringOffset + aRunStart + 1;
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endCharIndex = charStart + stringRange.location - aStringOffset + aRunStart + 1;
|
|
}
|
|
|
|
// Then we check if the clump falls outside our actual string range; if so, just go to the next.
|
|
if (endCharIndex <= aRunStart || baseCharIndex >= aRunStart + aRunLength) {
|
|
glyphStart = glyphEnd;
|
|
charStart = charEnd;
|
|
continue;
|
|
}
|
|
// Ensure we won't try to go beyond the valid length of the textRun's text
|
|
baseCharIndex = NS_MAX(baseCharIndex, aRunStart);
|
|
endCharIndex = NS_MIN(endCharIndex, aRunStart + aRunLength);
|
|
|
|
// Now we're ready to set the glyph info in the textRun; measure the glyph width
|
|
// of the first (perhaps only) glyph, to see if it is "Simple"
|
|
double toNextGlyph;
|
|
if (glyphStart < numGlyphs-1) {
|
|
toNextGlyph = positions[glyphStart+1].x - positions[glyphStart].x;
|
|
} else {
|
|
toNextGlyph = positions[0].x + runWidth - positions[glyphStart].x;
|
|
}
|
|
PRInt32 advance = PRInt32(toNextGlyph * appUnitsPerDevUnit);
|
|
|
|
// Check if it's a simple one-to-one mapping
|
|
PRInt32 glyphsInClump = glyphEnd - glyphStart;
|
|
if (glyphsInClump == 1 &&
|
|
gfxTextRun::CompressedGlyph::IsSimpleGlyphID(glyphs[glyphStart]) &&
|
|
gfxTextRun::CompressedGlyph::IsSimpleAdvance(advance) &&
|
|
aTextRun->IsClusterStart(baseCharIndex) &&
|
|
positions[glyphStart].y == 0.0)
|
|
{
|
|
aTextRun->SetSimpleGlyph(baseCharIndex,
|
|
g.SetSimpleGlyph(advance, glyphs[glyphStart]));
|
|
} else {
|
|
// collect all glyphs in a list to be assigned to the first char;
|
|
// there must be at least one in the clump, and we already measured its advance,
|
|
// hence the placement of the loop-exit test and the measurement of the next glyph
|
|
while (1) {
|
|
gfxTextRun::DetailedGlyph *details = detailedGlyphs.AppendElement();
|
|
details->mGlyphID = glyphs[glyphStart];
|
|
details->mXOffset = 0;
|
|
details->mYOffset = -positions[glyphStart].y * appUnitsPerDevUnit;
|
|
details->mAdvance = advance;
|
|
if (++glyphStart >= glyphEnd) {
|
|
break;
|
|
}
|
|
if (glyphStart < numGlyphs-1) {
|
|
toNextGlyph = positions[glyphStart+1].x - positions[glyphStart].x;
|
|
} else {
|
|
toNextGlyph = positions[0].x + runWidth - positions[glyphStart].x;
|
|
}
|
|
advance = PRInt32(toNextGlyph * appUnitsPerDevUnit);
|
|
}
|
|
|
|
gfxTextRun::CompressedGlyph g;
|
|
g.SetComplex(aTextRun->IsClusterStart(baseCharIndex),
|
|
PR_TRUE, detailedGlyphs.Length());
|
|
aTextRun->SetGlyphs(baseCharIndex, g, detailedGlyphs.Elements());
|
|
|
|
detailedGlyphs.Clear();
|
|
}
|
|
|
|
// the rest of the chars in the group are ligature continuations, no associated glyphs
|
|
while (++baseCharIndex != endCharIndex && baseCharIndex < aRunStart + aRunLength) {
|
|
g.SetComplex(inOrder && aTextRun->IsClusterStart(baseCharIndex),
|
|
PR_FALSE, 0);
|
|
aTextRun->SetGlyphs(baseCharIndex, g, nsnull);
|
|
}
|
|
|
|
glyphStart = glyphEnd;
|
|
charStart = charEnd;
|
|
}
|
|
|
|
return NS_OK;
|
|
}
|
|
|
|
// Construct the font attribute descriptor that we'll apply by default when creating a CTFontRef.
|
|
// This will turn off line-edge swashes by default, because we don't know the actual line breaks
|
|
// when doing glyph shaping.
|
|
void
|
|
gfxCoreTextShaper::CreateDefaultFeaturesDescriptor()
|
|
{
|
|
if (sDefaultFeaturesDescriptor != NULL) {
|
|
return;
|
|
}
|
|
|
|
SInt16 val = kSmartSwashType;
|
|
CFNumberRef swashesType =
|
|
::CFNumberCreate(kCFAllocatorDefault,
|
|
kCFNumberSInt16Type,
|
|
&val);
|
|
val = kLineInitialSwashesOffSelector;
|
|
CFNumberRef lineInitialsOffSelector =
|
|
::CFNumberCreate(kCFAllocatorDefault,
|
|
kCFNumberSInt16Type,
|
|
&val);
|
|
|
|
CFTypeRef keys[] = { kCTFontFeatureTypeIdentifierKey,
|
|
kCTFontFeatureSelectorIdentifierKey };
|
|
CFTypeRef values[] = { swashesType,
|
|
lineInitialsOffSelector };
|
|
CFDictionaryRef featureSettings[2];
|
|
featureSettings[0] =
|
|
::CFDictionaryCreate(kCFAllocatorDefault,
|
|
(const void **) keys,
|
|
(const void **) values,
|
|
NS_ARRAY_LENGTH(keys),
|
|
&kCFTypeDictionaryKeyCallBacks,
|
|
&kCFTypeDictionaryValueCallBacks);
|
|
::CFRelease(lineInitialsOffSelector);
|
|
|
|
val = kLineFinalSwashesOffSelector;
|
|
CFNumberRef lineFinalsOffSelector =
|
|
::CFNumberCreate(kCFAllocatorDefault,
|
|
kCFNumberSInt16Type,
|
|
&val);
|
|
values[1] = lineFinalsOffSelector;
|
|
featureSettings[1] =
|
|
::CFDictionaryCreate(kCFAllocatorDefault,
|
|
(const void **) keys,
|
|
(const void **) values,
|
|
NS_ARRAY_LENGTH(keys),
|
|
&kCFTypeDictionaryKeyCallBacks,
|
|
&kCFTypeDictionaryValueCallBacks);
|
|
::CFRelease(lineFinalsOffSelector);
|
|
::CFRelease(swashesType);
|
|
|
|
CFArrayRef featuresArray =
|
|
::CFArrayCreate(kCFAllocatorDefault,
|
|
(const void **) featureSettings,
|
|
NS_ARRAY_LENGTH(featureSettings),
|
|
&kCFTypeArrayCallBacks);
|
|
::CFRelease(featureSettings[0]);
|
|
::CFRelease(featureSettings[1]);
|
|
|
|
const CFTypeRef attrKeys[] = { kCTFontFeatureSettingsAttribute };
|
|
const CFTypeRef attrValues[] = { featuresArray };
|
|
CFDictionaryRef attributesDict =
|
|
::CFDictionaryCreate(kCFAllocatorDefault,
|
|
(const void **) attrKeys,
|
|
(const void **) attrValues,
|
|
NS_ARRAY_LENGTH(attrKeys),
|
|
&kCFTypeDictionaryKeyCallBacks,
|
|
&kCFTypeDictionaryValueCallBacks);
|
|
::CFRelease(featuresArray);
|
|
|
|
sDefaultFeaturesDescriptor =
|
|
::CTFontDescriptorCreateWithAttributes(attributesDict);
|
|
::CFRelease(attributesDict);
|
|
}
|
|
|
|
// Create a CTFontRef, with the Common Ligatures feature disabled [static]
|
|
CTFontRef
|
|
gfxCoreTextShaper::CreateCTFontWithDisabledLigatures(ATSFontRef aFontRef, CGFloat aSize)
|
|
{
|
|
if (sDisableLigaturesDescriptor == NULL) {
|
|
// initialize cached descriptor to turn off the Common Ligatures feature
|
|
SInt16 val = kLigaturesType;
|
|
CFNumberRef ligaturesType =
|
|
::CFNumberCreate(kCFAllocatorDefault,
|
|
kCFNumberSInt16Type,
|
|
&val);
|
|
val = kCommonLigaturesOffSelector;
|
|
CFNumberRef commonLigaturesOffSelector =
|
|
::CFNumberCreate(kCFAllocatorDefault,
|
|
kCFNumberSInt16Type,
|
|
&val);
|
|
|
|
const CFTypeRef keys[] = { kCTFontFeatureTypeIdentifierKey,
|
|
kCTFontFeatureSelectorIdentifierKey };
|
|
const CFTypeRef values[] = { ligaturesType,
|
|
commonLigaturesOffSelector };
|
|
CFDictionaryRef featureSettingDict =
|
|
::CFDictionaryCreate(kCFAllocatorDefault,
|
|
(const void **) keys,
|
|
(const void **) values,
|
|
NS_ARRAY_LENGTH(keys),
|
|
&kCFTypeDictionaryKeyCallBacks,
|
|
&kCFTypeDictionaryValueCallBacks);
|
|
::CFRelease(ligaturesType);
|
|
::CFRelease(commonLigaturesOffSelector);
|
|
|
|
CFArrayRef featuresArray =
|
|
::CFArrayCreate(kCFAllocatorDefault,
|
|
(const void **) &featureSettingDict,
|
|
1,
|
|
&kCFTypeArrayCallBacks);
|
|
::CFRelease(featureSettingDict);
|
|
|
|
CFDictionaryRef attributesDict =
|
|
::CFDictionaryCreate(kCFAllocatorDefault,
|
|
(const void **) &kCTFontFeatureSettingsAttribute,
|
|
(const void **) &featuresArray,
|
|
1, // count of keys & values
|
|
&kCFTypeDictionaryKeyCallBacks,
|
|
&kCFTypeDictionaryValueCallBacks);
|
|
::CFRelease(featuresArray);
|
|
|
|
sDisableLigaturesDescriptor =
|
|
::CTFontDescriptorCreateCopyWithAttributes(GetDefaultFeaturesDescriptor(), attributesDict);
|
|
::CFRelease(attributesDict);
|
|
}
|
|
|
|
return ::CTFontCreateWithPlatformFont(aFontRef, aSize, NULL, sDisableLigaturesDescriptor);
|
|
}
|
|
|
|
void
|
|
gfxCoreTextShaper::Shutdown() // [static]
|
|
{
|
|
if (sDisableLigaturesDescriptor != NULL) {
|
|
::CFRelease(sDisableLigaturesDescriptor);
|
|
sDisableLigaturesDescriptor = NULL;
|
|
}
|
|
if (sDefaultFeaturesDescriptor != NULL) {
|
|
::CFRelease(sDefaultFeaturesDescriptor);
|
|
sDefaultFeaturesDescriptor = NULL;
|
|
}
|
|
}
|