author | Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com> |
Thu, 24 Sep 2009 12:53:48 +0300 | |
changeset 11 | c8a366e56285 |
parent 0 | dd21522fd290 |
permissions | -rw-r--r-- |
0
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/* |
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* Copyright (C) 2006, 2007 Apple Inc. All rights reserved. |
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* |
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* Redistribution and use in source and binary forms, with or without |
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* modification, are permitted provided that the following conditions |
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* are met: |
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* |
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* 1. Redistributions of source code must retain the above copyright |
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* notice, this list of conditions and the following disclaimer. |
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* 2. Redistributions in binary form must reproduce the above copyright |
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* notice, this list of conditions and the following disclaimer in the |
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* documentation and/or other materials provided with the distribution. |
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* 3. Neither the name of Apple Computer, Inc. ("Apple") nor the names of |
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* its contributors may be used to endorse or promote products derived |
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* from this software without specific prior written permission. |
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* |
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* THIS SOFTWARE IS PROVIDED BY APPLE AND ITS CONTRIBUTORS "AS IS" AND ANY |
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* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED |
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* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE |
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* DISCLAIMED. IN NO EVENT SHALL APPLE OR ITS CONTRIBUTORS BE LIABLE FOR ANY |
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* DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES |
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* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; |
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* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND |
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* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF |
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* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
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*/ |
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|
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#import "config.h" |
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#import "WebFontCache.h" |
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|
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#import <math.h> |
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|
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#define SYNTHESIZED_FONT_TRAITS (NSBoldFontMask | NSItalicFontMask) |
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|
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#define IMPORTANT_FONT_TRAITS (0 \ |
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| NSBoldFontMask \ |
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| NSCompressedFontMask \ |
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| NSCondensedFontMask \ |
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| NSExpandedFontMask \ |
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| NSItalicFontMask \ |
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| NSNarrowFontMask \ |
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| NSPosterFontMask \ |
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| NSSmallCapsFontMask \ |
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) |
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|
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#define DESIRED_WEIGHT 5 |
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|
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static BOOL acceptableChoice(NSFontTraitMask desiredTraits, int desiredWeight, |
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NSFontTraitMask candidateTraits, int candidateWeight) |
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{ |
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desiredTraits &= ~SYNTHESIZED_FONT_TRAITS; |
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return (candidateTraits & desiredTraits) == desiredTraits; |
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} |
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|
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static BOOL betterChoice(NSFontTraitMask desiredTraits, int desiredWeight, |
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NSFontTraitMask chosenTraits, int chosenWeight, |
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NSFontTraitMask candidateTraits, int candidateWeight) |
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{ |
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if (!acceptableChoice(desiredTraits, desiredWeight, candidateTraits, candidateWeight)) { |
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return NO; |
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} |
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|
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// A list of the traits we care about. |
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// The top item in the list is the worst trait to mismatch; if a font has this |
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// and we didn't ask for it, we'd prefer any other font in the family. |
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const NSFontTraitMask masks[] = { |
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NSPosterFontMask, |
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NSSmallCapsFontMask, |
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NSItalicFontMask, |
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NSCompressedFontMask, |
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NSCondensedFontMask, |
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NSExpandedFontMask, |
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NSNarrowFontMask, |
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NSBoldFontMask, |
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0 }; |
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int i = 0; |
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NSFontTraitMask mask; |
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while ((mask = masks[i++])) { |
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BOOL desired = (desiredTraits & mask) != 0; |
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BOOL chosenHasUnwantedTrait = desired != ((chosenTraits & mask) != 0); |
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BOOL candidateHasUnwantedTrait = desired != ((candidateTraits & mask) != 0); |
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if (!candidateHasUnwantedTrait && chosenHasUnwantedTrait) |
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return YES; |
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if (!chosenHasUnwantedTrait && candidateHasUnwantedTrait) |
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return NO; |
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} |
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|
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int chosenWeightDelta = chosenWeight - desiredWeight; |
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int candidateWeightDelta = candidateWeight - desiredWeight; |
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|
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int chosenWeightDeltaMagnitude = abs(chosenWeightDelta); |
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int candidateWeightDeltaMagnitude = abs(candidateWeightDelta); |
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|
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// Smaller magnitude wins. |
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// If both have same magnitude, tie breaker is that the smaller weight wins. |
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// Otherwise, first font in the array wins (should almost never happen). |
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if (candidateWeightDeltaMagnitude < chosenWeightDeltaMagnitude) { |
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return YES; |
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} |
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if (candidateWeightDeltaMagnitude == chosenWeightDeltaMagnitude && candidateWeight < chosenWeight) { |
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return YES; |
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} |
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|
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return NO; |
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} |
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|
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@implementation WebFontCache |
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|
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// Family name is somewhat of a misnomer here. We first attempt to find an exact match |
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// comparing the desiredFamily to the PostScript name of the installed fonts. If that fails |
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// we then do a search based on the family names of the installed fonts. |
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+ (NSFont *)internalFontWithFamily:(NSString *)desiredFamily traits:(NSFontTraitMask)desiredTraits size:(float)size |
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{ |
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NSFontManager *fontManager = [NSFontManager sharedFontManager]; |
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|
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// Look for an exact match first. |
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NSEnumerator *availableFonts = [[fontManager availableFonts] objectEnumerator]; |
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NSString *availableFont; |
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while ((availableFont = [availableFonts nextObject])) { |
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if ([desiredFamily caseInsensitiveCompare:availableFont] == NSOrderedSame) { |
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NSFont *nameMatchedFont = [NSFont fontWithName:availableFont size:size]; |
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123 |
|
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// Special case Osaka-Mono. According to <rdar://problem/3999467>, we need to |
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// treat Osaka-Mono as fixed pitch. |
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if ([desiredFamily caseInsensitiveCompare:@"Osaka-Mono"] == NSOrderedSame && desiredTraits == 0) |
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return nameMatchedFont; |
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|
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NSFontTraitMask traits = [fontManager traitsOfFont:nameMatchedFont]; |
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if ((traits & desiredTraits) == desiredTraits) |
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return [fontManager convertFont:nameMatchedFont toHaveTrait:desiredTraits]; |
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break; |
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} |
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} |
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|
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// Do a simple case insensitive search for a matching font family. |
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// NSFontManager requires exact name matches. |
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// This addresses the problem of matching arial to Arial, etc., but perhaps not all the issues. |
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NSEnumerator *e = [[fontManager availableFontFamilies] objectEnumerator]; |
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NSString *availableFamily; |
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while ((availableFamily = [e nextObject])) { |
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if ([desiredFamily caseInsensitiveCompare:availableFamily] == NSOrderedSame) |
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break; |
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} |
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|
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// Found a family, now figure out what weight and traits to use. |
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BOOL choseFont = false; |
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int chosenWeight = 0; |
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NSFontTraitMask chosenTraits = 0; |
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|
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NSArray *fonts = [fontManager availableMembersOfFontFamily:availableFamily]; |
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unsigned n = [fonts count]; |
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unsigned i; |
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for (i = 0; i < n; i++) { |
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NSArray *fontInfo = [fonts objectAtIndex:i]; |
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|
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// Array indices must be hard coded because of lame AppKit API. |
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int fontWeight = [[fontInfo objectAtIndex:2] intValue]; |
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NSFontTraitMask fontTraits = [[fontInfo objectAtIndex:3] unsignedIntValue]; |
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|
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BOOL newWinner; |
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if (!choseFont) |
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newWinner = acceptableChoice(desiredTraits, DESIRED_WEIGHT, fontTraits, fontWeight); |
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else |
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newWinner = betterChoice(desiredTraits, DESIRED_WEIGHT, chosenTraits, chosenWeight, fontTraits, fontWeight); |
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|
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if (newWinner) { |
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choseFont = YES; |
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chosenWeight = fontWeight; |
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chosenTraits = fontTraits; |
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|
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if (chosenWeight == DESIRED_WEIGHT && (chosenTraits & IMPORTANT_FONT_TRAITS) == (desiredTraits & IMPORTANT_FONT_TRAITS)) |
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break; |
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} |
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} |
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|
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if (!choseFont) |
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return nil; |
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|
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NSFont *font = [fontManager fontWithFamily:availableFamily traits:chosenTraits weight:chosenWeight size:size]; |
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|
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if (!font) |
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return nil; |
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|
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NSFontTraitMask actualTraits = 0; |
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if (desiredTraits & (NSItalicFontMask | NSBoldFontMask)) |
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actualTraits = [[NSFontManager sharedFontManager] traitsOfFont:font]; |
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|
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bool syntheticBold = (desiredTraits & NSBoldFontMask) && !(actualTraits & NSBoldFontMask); |
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bool syntheticOblique = (desiredTraits & NSItalicFontMask) && !(actualTraits & NSItalicFontMask); |
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|
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// There are some malformed fonts that will be correctly returned by -fontWithFamily:traits:weight:size: as a match for a particular trait, |
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// though -[NSFontManager traitsOfFont:] incorrectly claims the font does not have the specified trait. This could result in applying |
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// synthetic bold on top of an already-bold font, as reported in <http://bugs.webkit.org/show_bug.cgi?id=6146>. To work around this |
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// problem, if we got an apparent exact match, but the requested traits aren't present in the matched font, we'll try to get a font from |
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// the same family without those traits (to apply the synthetic traits to later). |
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NSFontTraitMask nonSyntheticTraits = desiredTraits; |
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|
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if (syntheticBold) |
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nonSyntheticTraits &= ~NSBoldFontMask; |
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|
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if (syntheticOblique) |
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nonSyntheticTraits &= ~NSItalicFontMask; |
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|
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if (nonSyntheticTraits != desiredTraits) { |
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NSFont *fontWithoutSyntheticTraits = [fontManager fontWithFamily:availableFamily traits:nonSyntheticTraits weight:chosenWeight size:size]; |
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if (fontWithoutSyntheticTraits) |
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font = fontWithoutSyntheticTraits; |
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209 |
} |
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210 |
|
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return font; |
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} |
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+ (NSFont *)fontWithFamily:(NSString *)desiredFamily traits:(NSFontTraitMask)desiredTraits size:(float)size |
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{ |
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#ifndef BUILDING_ON_TIGER |
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NSFont *font = [self internalFontWithFamily:desiredFamily traits:desiredTraits size:size]; |
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if (font) |
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return font; |
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// Auto activate the font before looking for it a second time. |
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// Ignore the result because we want to use our own algorithm to actually find the font. |
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[NSFont fontWithName:desiredFamily size:size]; |
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#endif |
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return [self internalFontWithFamily:desiredFamily traits:desiredTraits size:size]; |
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} |
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@end |