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pjs/gfx/thebes/gfxCoreTextShaper.cpp

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/* -*- Mode: C++; tab-width: 20; indent-tabs-mode: nil; c-basic-offset: 4 -*-
* ***** BEGIN LICENSE BLOCK *****
* Version: MPL 1.1/GPL 2.0/LGPL 2.1
*
* The contents of this file are subject to the Mozilla Public License Version
* 1.1 (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
* http://www.mozilla.org/MPL/
*
* Software distributed under the License is distributed on an "AS IS" basis,
* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
* for the specific language governing rights and limitations under the
* License.
*
* The Original Code is Mozilla Corporation code.
*
* The Initial Developer of the Original Code is Mozilla Foundation.
* Portions created by the Initial Developer are Copyright (C) 2006-2009
* the Initial Developer. All Rights Reserved.
*
* Contributor(s):
* Vladimir Vukicevic <vladimir@pobox.com>
* Masayuki Nakano <masayuki@d-toybox.com>
* John Daggett <jdaggett@mozilla.com>
* Jonathan Kew <jfkthame@gmail.com>
*
* Alternatively, the contents of this file may be used under the terms of
* either the GNU General Public License Version 2 or later (the "GPL"), or
* the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
* in which case the provisions of the GPL or the LGPL are applicable instead
* of those above. If you wish to allow use of your version of this file only
* under the terms of either the GPL or the LGPL, and not to allow others to
* use your version of this file under the terms of the MPL, indicate your
* decision by deleting the provisions above and replace them with the notice
* and other provisions required by the GPL or the LGPL. If you do not delete
* the provisions above, a recipient may use your version of this file under
* the terms of any one of the MPL, the GPL or the LGPL.
*
* ***** END LICENSE BLOCK ***** */
#include "prtypes.h"
#include "prmem.h"
#include "nsString.h"
#include "nsBidiUtils.h"
#include "gfxTypes.h"
#include "nsPromiseFlatString.h"
#include "gfxContext.h"
#include "gfxPlatform.h"
#include "gfxPlatformMac.h"
#include "gfxCoreTextShaper.h"
#include "gfxMacFont.h"
#include "gfxFontTest.h"
#include "gfxFontUtils.h"
#include "gfxQuartzSurface.h"
#include "gfxMacPlatformFontList.h"
#include "gfxUserFontSet.h"
#include "nsUnicodeRange.h"
// Uncomment this to dump all text runs created to the log (if enabled)
//#define DUMP_TEXT_RUNS
#ifdef DUMP_TEXT_RUNS
static PRLogModuleInfo *gCoreTextTextRunLog = PR_NewLogModule("coreTextTextRun");
#endif
// standard font descriptors that we construct the first time they're needed
CTFontDescriptorRef gfxCoreTextShaper::sDefaultFeaturesDescriptor = NULL;
CTFontDescriptorRef gfxCoreTextShaper::sDisableLigaturesDescriptor = NULL;
gfxCoreTextShaper::gfxCoreTextShaper(gfxMacFont *aFont)
: gfxFontShaper(aFont)
{
// Create our CTFontRef
mCTFont = ::CTFontCreateWithPlatformFont(aFont->GetATSFontRef(),
aFont->GetAdjustedSize(),
NULL,
GetDefaultFeaturesDescriptor());
// Set up the default attribute dictionary that we will need each time we create a CFAttributedString
mAttributesDict = ::CFDictionaryCreate(kCFAllocatorDefault,
(const void**) &kCTFontAttributeName,
(const void**) &mCTFont,
1, // count of attributes
&kCFTypeDictionaryKeyCallBacks,
&kCFTypeDictionaryValueCallBacks);
}
gfxCoreTextShaper::~gfxCoreTextShaper()
{
if (mAttributesDict) {
::CFRelease(mAttributesDict);
}
if (mCTFont) {
::CFRelease(mCTFont);
}
}
PRBool
gfxCoreTextShaper::InitTextRun(gfxContext *aContext,
gfxTextRun *aTextRun,
const PRUnichar *aString,
PRUint32 aRunStart,
PRUint32 aRunLength,
PRInt32 aRunScript)
{
// aRunStart and aRunLength define the section of the textRun and of aString
// that is to be drawn with this particular font
PRBool disableLigatures = (aTextRun->GetFlags() & gfxTextRunFactory::TEXT_DISABLE_OPTIONAL_LIGATURES) != 0;
// Create a CFAttributedString with text and style info, so we can use CoreText to lay it out.
PRBool isRTL = aTextRun->IsRightToLeft();
// we need to bidi-wrap the text if the run is RTL,
// or if it is an LTR run but may contain (overridden) RTL chars
PRBool bidiWrap = isRTL;
if (!bidiWrap && (aTextRun->GetFlags() & gfxTextRunFactory::TEXT_IS_8BIT) == 0) {
PRUint32 i;
for (i = aRunStart; i < aRunStart + aRunLength; ++i) {
if (gfxFontUtils::PotentialRTLChar(aString[i])) {
bidiWrap = PR_TRUE;
break;
}
}
}
// If there's a possibility of any bidi, we wrap the text with direction overrides
// to ensure neutrals or characters that were bidi-overridden in HTML behave properly.
const UniChar beginLTR[] = { 0x202d, 0x20 };
const UniChar beginRTL[] = { 0x202e, 0x20 };
const UniChar endBidiWrap[] = { 0x20, 0x2e, 0x202c };
PRUint32 startOffset;
CFStringRef stringObj;
if (bidiWrap) {
startOffset = isRTL ?
sizeof(beginRTL) / sizeof(beginRTL[0]) : sizeof(beginLTR) / sizeof(beginLTR[0]);
CFMutableStringRef mutableString =
::CFStringCreateMutable(kCFAllocatorDefault,
aRunLength + startOffset +
sizeof(endBidiWrap) / sizeof(endBidiWrap[0]));
::CFStringAppendCharacters(mutableString,
isRTL ? beginRTL : beginLTR,
startOffset);
::CFStringAppendCharacters(mutableString,
aString + aRunStart, aRunLength);
::CFStringAppendCharacters(mutableString,
endBidiWrap,
sizeof(endBidiWrap) / sizeof(endBidiWrap[0]));
stringObj = mutableString;
} else {
startOffset = 0;
stringObj = ::CFStringCreateWithCharactersNoCopy(kCFAllocatorDefault,
aString + aRunStart,
aRunLength,
kCFAllocatorNull);
}
CFDictionaryRef attrObj;
if (disableLigatures) {
// For letterspacing (or maybe other situations) we need to make a copy of the CTFont
// with the ligature feature disabled
gfxMacFont *font = static_cast<gfxMacFont*>(mFont);
CTFontRef ctFont =
CreateCTFontWithDisabledLigatures(font->GetATSFontRef(),
::CTFontGetSize(mCTFont));
attrObj =
::CFDictionaryCreate(kCFAllocatorDefault,
(const void**) &kCTFontAttributeName,
(const void**) &ctFont,
1, // count of attributes
&kCFTypeDictionaryKeyCallBacks,
&kCFTypeDictionaryValueCallBacks);
// Having created the dict, we're finished with our ligature-disabled CTFontRef
::CFRelease(ctFont);
} else {
attrObj = mAttributesDict;
::CFRetain(attrObj);
}
// Now we can create an attributed string
CFAttributedStringRef attrStringObj =
::CFAttributedStringCreate(kCFAllocatorDefault, stringObj, attrObj);
::CFRelease(stringObj);
::CFRelease(attrObj);
// Create the CoreText line from our string, then we're done with it
CTLineRef line = ::CTLineCreateWithAttributedString(attrStringObj);
::CFRelease(attrStringObj);
// and finally retrieve the glyph data and store into the gfxTextRun
CFArrayRef glyphRuns = ::CTLineGetGlyphRuns(line);
PRUint32 numRuns = ::CFArrayGetCount(glyphRuns);
// Iterate through the glyph runs.
// Note that this includes the bidi wrapper, so we have to be careful
// not to include the extra glyphs from there
PRBool success = PR_TRUE;
for (PRUint32 runIndex = 0; runIndex < numRuns; runIndex++) {
CTRunRef aCTRun = (CTRunRef)::CFArrayGetValueAtIndex(glyphRuns, runIndex);
if (SetGlyphsFromRun(aTextRun, aCTRun, startOffset,
aRunStart, aRunLength) != NS_OK) {
success = PR_FALSE;
break;
}
}
::CFRelease(line);
return success;
}
#define SMALL_GLYPH_RUN 128 // preallocated size of our auto arrays for per-glyph data;
// some testing indicates that 90%+ of glyph runs will fit
// without requiring a separate allocation
nsresult
gfxCoreTextShaper::SetGlyphsFromRun(gfxTextRun *aTextRun,
CTRunRef aCTRun,
PRInt32 aStringOffset, // offset in the string used to build the CTLine
PRInt32 aRunStart, // starting offset of this font run in the gfxTextRun
PRInt32 aRunLength) // length of this font run in characters
{
// The textRun has been bidi-wrapped; aStringOffset is the number
// of chars at the beginning of the CTLine that we should skip.
// aRunStart and aRunLength define the range of characters
// within the textRun that are "real" data we need to handle.
// aCTRun is a glyph run from the CoreText layout process.
PRBool isLTR = !aTextRun->IsRightToLeft();
PRInt32 direction = isLTR ? 1 : -1;
PRInt32 numGlyphs = ::CTRunGetGlyphCount(aCTRun);
if (numGlyphs == 0) {
return NS_OK;
}
// character offsets get really confusing here, as we have to keep track of
// (a) the text in the actual textRun we're constructing
// (b) the "font run" being rendered with the current font, defined by aRunStart and aRunLength
// parameters to InitTextRun
// (c) the string that was handed to CoreText, which contains the text of the font run
// plus directional-override padding
// (d) the CTRun currently being processed, which may be a sub-run of the CoreText line
// (but may extend beyond the actual font run into the bidi wrapping text).
// aStringOffset tells us how many initial characters of the line to ignore.
// get the source string range within the CTLine's text
CFRange stringRange = ::CTRunGetStringRange(aCTRun);
// skip the run if it is entirely outside the actual range of the font run
if (stringRange.location - aStringOffset + stringRange.length <= 0 ||
stringRange.location - aStringOffset >= aRunLength) {
return NS_OK;
}
// retrieve the laid-out glyph data from the CTRun
nsAutoArrayPtr<CGGlyph> glyphsArray;
nsAutoArrayPtr<CGPoint> positionsArray;
nsAutoArrayPtr<CFIndex> glyphToCharArray;
const CGGlyph* glyphs = NULL;
const CGPoint* positions = NULL;
const CFIndex* glyphToChar = NULL;
// Testing indicates that CTRunGetGlyphsPtr (almost?) always succeeds,
// and so allocating a new array and copying data with CTRunGetGlyphs
// will be extremely rare.
// If this were not the case, we could use an nsAutoTArray<> to
// try and avoid the heap allocation for small runs.
// It's possible that some future change to CoreText will mean that
// CTRunGetGlyphsPtr fails more often; if this happens, nsAutoTArray<>
// may become an attractive option.
glyphs = ::CTRunGetGlyphsPtr(aCTRun);
if (!glyphs) {
glyphsArray = new (std::nothrow) CGGlyph[numGlyphs];
if (!glyphsArray) {
return NS_ERROR_OUT_OF_MEMORY;
}
::CTRunGetGlyphs(aCTRun, ::CFRangeMake(0, 0), glyphsArray.get());
glyphs = glyphsArray.get();
}
positions = ::CTRunGetPositionsPtr(aCTRun);
if (!positions) {
positionsArray = new (std::nothrow) CGPoint[numGlyphs];
if (!positionsArray) {
return NS_ERROR_OUT_OF_MEMORY;
}
::CTRunGetPositions(aCTRun, ::CFRangeMake(0, 0), positionsArray.get());
positions = positionsArray.get();
}
// Remember that the glyphToChar indices relate to the CoreText line
// not to the beginning of the textRun, the font run, or the stringRange of the glyph run
glyphToChar = ::CTRunGetStringIndicesPtr(aCTRun);
if (!glyphToChar) {
glyphToCharArray = new (std::nothrow) CFIndex[numGlyphs];
if (!glyphToCharArray) {
return NS_ERROR_OUT_OF_MEMORY;
}
::CTRunGetStringIndices(aCTRun, ::CFRangeMake(0, 0), glyphToCharArray.get());
glyphToChar = glyphToCharArray.get();
}
double runWidth = ::CTRunGetTypographicBounds(aCTRun, ::CFRangeMake(0, 0), NULL, NULL, NULL);
nsAutoTArray<gfxTextRun::DetailedGlyph,1> detailedGlyphs;
gfxTextRun::CompressedGlyph g;
const PRUint32 appUnitsPerDevUnit = aTextRun->GetAppUnitsPerDevUnit();
// CoreText gives us the glyphindex-to-charindex mapping, which relates each glyph
// to a source text character; we also need the charindex-to-glyphindex mapping to
// find the glyph for a given char. Note that some chars may not map to any glyph
// (ligature continuations), and some may map to several glyphs (eg Indic split vowels).
// We set the glyph index to NO_GLYPH for chars that have no associated glyph, and we
// record the last glyph index for cases where the char maps to several glyphs,
// so that our clumping will include all the glyph fragments for the character.
// The charToGlyph array is indexed by char position within the stringRange of the glyph run.
static const PRInt32 NO_GLYPH = -1;
nsAutoTArray<PRInt32,SMALL_GLYPH_RUN> charToGlyphArray;
if (!charToGlyphArray.SetLength(stringRange.length)) {
return NS_ERROR_OUT_OF_MEMORY;
}
PRInt32 *charToGlyph = charToGlyphArray.Elements();
for (PRInt32 offset = 0; offset < stringRange.length; ++offset) {
charToGlyph[offset] = NO_GLYPH;
}
for (PRInt32 i = 0; i < numGlyphs; ++i) {
PRInt32 loc = glyphToChar[i] - stringRange.location;
if (loc >= 0 && loc < stringRange.length) {
charToGlyph[loc] = i;
}
}
// Find character and glyph clumps that correspond, allowing for ligatures,
// indic reordering, split glyphs, etc.
//
// The idea is that we'll find a character sequence starting at the first char of stringRange,
// and extend it until it includes the character associated with the first glyph;
// we also extend it as long as there are "holes" in the range of glyphs. So we
// will eventually have a contiguous sequence of characters, starting at the beginning
// of the range, that map to a contiguous sequence of glyphs, starting at the beginning
// of the glyph array. That's a clump; then we update the starting positions and repeat.
//
// NB: In the case of RTL layouts, we iterate over the stringRange in reverse.
//
// This may find characters that fall outside the range aRunStart:aRunLength,
// so we won't necessarily use everything we find here.
PRInt32 glyphStart = 0; // looking for a clump that starts at this glyph index
PRInt32 charStart = isLTR ?
0 : stringRange.length-1; // and this char index (in the stringRange of the glyph run)
while (glyphStart < numGlyphs) { // keep finding groups until all glyphs are accounted for
PRBool inOrder = PR_TRUE;
PRInt32 charEnd = glyphToChar[glyphStart] - stringRange.location;
NS_ASSERTION(charEnd >= 0 && charEnd < stringRange.length,
"glyph-to-char mapping points outside string range");
PRInt32 glyphEnd = glyphStart;
PRInt32 charLimit = isLTR ? stringRange.length : -1;
do {
// This is normally executed once for each iteration of the outer loop,
// but in unusual cases where the character/glyph association is complex,
// the initial character range might correspond to a non-contiguous
// glyph range with "holes" in it. If so, we will repeat this loop to
// extend the character range until we have a contiguous glyph sequence.
NS_ASSERTION((direction > 0 && charEnd < charLimit) ||
(direction < 0 && charEnd > charLimit),
"no characters left in range?");
charEnd += direction;
while (charEnd != charLimit && charToGlyph[charEnd] == NO_GLYPH) {
charEnd += direction;
}
// find the maximum glyph index covered by the clump so far
for (PRInt32 i = charStart; i != charEnd; i += direction) {
if (charToGlyph[i] != NO_GLYPH) {
glyphEnd = PR_MAX(glyphEnd, charToGlyph[i] + 1); // update extent of glyph range
}
}
if (glyphEnd == glyphStart + 1) {
// for the common case of a single-glyph clump, we can skip the following checks
break;
}
if (glyphEnd == glyphStart) {
// no glyphs, try to extend the clump
continue;
}
// check whether all glyphs in the range are associated with the characters
// in our clump; if not, we have a discontinuous range, and should extend it
// unless we've reached the end of the text
PRBool allGlyphsAreWithinCluster = PR_TRUE;
PRInt32 prevGlyphCharIndex = charStart;
for (PRInt32 i = glyphStart; i < glyphEnd; ++i) {
PRInt32 glyphCharIndex = glyphToChar[i] - stringRange.location;
if (isLTR) {
if (glyphCharIndex < charStart || glyphCharIndex >= charEnd) {
allGlyphsAreWithinCluster = PR_FALSE;
break;
}
if (glyphCharIndex < prevGlyphCharIndex) {
inOrder = PR_FALSE;
}
prevGlyphCharIndex = glyphCharIndex;
} else {
if (glyphCharIndex > charStart || glyphCharIndex <= charEnd) {
allGlyphsAreWithinCluster = PR_FALSE;
break;
}
if (glyphCharIndex > prevGlyphCharIndex) {
inOrder = PR_FALSE;
}
prevGlyphCharIndex = glyphCharIndex;
}
}
if (allGlyphsAreWithinCluster) {
break;
}
} while (charEnd != charLimit);
NS_ASSERTION(glyphStart < glyphEnd, "character/glyph clump contains no glyphs!");
NS_ASSERTION(charStart != charEnd, "character/glyph contains no characters!");
// Now charStart..charEnd is a ligature clump, corresponding to glyphStart..glyphEnd;
// Set baseCharIndex to the char we'll actually attach the glyphs to (1st of ligature),
// and endCharIndex to the limit (position beyond the last char),
// adjusting for the offset of the stringRange relative to the textRun.
PRInt32 baseCharIndex, endCharIndex;
if (isLTR) {
while (charEnd < stringRange.length && charToGlyph[charEnd] == NO_GLYPH) {
charEnd++;
}
baseCharIndex = charStart + stringRange.location - aStringOffset + aRunStart;
endCharIndex = charEnd + stringRange.location - aStringOffset + aRunStart;
} else {
while (charEnd >= 0 && charToGlyph[charEnd] == NO_GLYPH) {
charEnd--;
}
baseCharIndex = charEnd + stringRange.location - aStringOffset + aRunStart + 1;
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 = PR_MAX(baseCharIndex, aRunStart);
endCharIndex = PR_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;
}
}
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