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July 7, 2010 04:16
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| // | |
| // GlyphDrawing.h | |
| // | |
| // Created by Masashi Ono on 07/07/10. | |
| // http://akisute.com | |
| // Original file created by Jens Egeblad on 11/16/09. | |
| // http://mexircus.com/blog//blog4.php/2009/11/16/cgfontgetglyphsforunichars-alternatives | |
| // http://www.mexircus.com/codes/GlyphDrawing.mm | |
| // | |
| // | |
| // Purpose: Reimplement CGFontGetGlyphsForUnichars(CGFontRef, unichar[], CGGlyph[], size_t) | |
| // | |
| // The function that does that: | |
| // size_t CMFontGetGlyphsForUnichars(CGFontRef cgFont, const UniChar buffer[], CGGlyph glyphs[], size_t numGlyphs) | |
| // | |
| // (returns number of glyps put in glyphs) | |
| // | |
| // Why?: We are not allowed to use it on the iPhone. Apple rejects apps with it. | |
| // | |
| // Why do we need it?: | |
| // 1. UIString drawing is not thread safe | |
| // 2. PDF drawing doesn't embeded fonts, and is therefore impossible with UIString drawing | |
| // | |
| // Another work-around for UIString drawing: Make sure it always occurs in main-thread with e.g. performSelector | |
| // | |
| // How does it work?: | |
| // Fetch cmap (character map) table of font | |
| // Find the right segment (We only look for platform 0 and 3 and format 4 and 12) | |
| // Pick a platform+format for all subsequent lookups. | |
| // Cache selection | |
| // | |
| // For each unichar look for character in selected cmap segment (either format 4 or 12) | |
| // | |
| // How well does it work?: | |
| // This files contains testing code. All 65536 unichars are tested with our function | |
| // and Apples. Testing generally gives perfect results for all | |
| // current fonts except: | |
| // + AppleGothic where there are about 300 character mismatches from char 55424 and up | |
| // + STHeitiTC-Light and STHeitiTC-Medium which has one character mismatch | |
| // | |
| // Why those anomalies?: I don't know... | |
| // | |
| // Possible improvements: | |
| // + cache better: | |
| // We cache the fonttables and never release them. Consider release strateies | |
| /// + Search faster: | |
| // It may be possible to do binary searching in the tables if they are sorted | |
| // which I don't know if they are | |
| // + Add more formats: Only format 4 and 12 supported. That handles all present iPhone fonts. | |
| // + Fix current minor issues. | |
| // | |
| // | |
| // This code was mainly based on: | |
| // http://github.com/jamesjhu/CMGlyphDrawing | |
| // | |
| // Other reading: | |
| // Apple document on truetype format: http://developer.apple.com/textfonts/TTRefMan/RM06/Chap6cmap.html | |
| // Another code: http://code.google.com/p/cocos2d-iphone/source/browse/trunk/external/FontLabel/FontLabelStringDrawing.m?spec=svn1358&r=1358 | |
| #import <Foundation/Foundation.h> | |
| UIKIT_EXTERN size_t CMFontGetGlyphsForUnichars(CGFontRef cgFont, const UniChar buffer[], CGGlyph glyphs[], size_t numGlyphs); | |
| // Usage: just import "GlyphDrawing.h" in GlyphDrawing.mm instead of <Foundation/Foundation.h> |
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Hello, can you post the GlyphDrawing.mm? because the original one from http://www.mexircus.com/codes/GlyphDrawing.mm can't be found already. Thanks