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      1 /*
      2  * Copyright (C) 2007 Kevin Ollivier <kevino (at) theolliviers.com>
      3  *
      4  * Redistribution and use in source and binary forms, with or without
      5  * modification, are permitted provided that the following conditions
      6  * are met:
      7  * 1. Redistributions of source code must retain the above copyright
      8  *    notice, this list of conditions and the following disclaimer.
      9  * 2. Redistributions in binary form must reproduce the above copyright
     10  *    notice, this list of conditions and the following disclaimer in the
     11  *    documentation and/or other materials provided with the distribution.
     12  *
     13  * THIS SOFTWARE IS PROVIDED BY APPLE COMPUTER, INC. ``AS IS'' AND ANY
     14  * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     15  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
     16  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL APPLE COMPUTER, INC. OR
     17  * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
     18  * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
     19  * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
     20  * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
     21  * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
     22  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
     23  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
     24  */
     25 
     26 #include "config.h"
     27 // this needs to be included before fontprops.h for UChar* to be defined.
     28 #include <wtf/unicode/Unicode.h>
     29 
     30 #include "fontprops.h"
     31 #include "WebCoreSystemInterface.h"
     32 
     33 #include <ApplicationServices/ApplicationServices.h>
     34 
     35 #include <wx/defs.h>
     36 #include <wx/gdicmn.h>
     37 #include <wx/graphics.h>
     38 
     39 const float smallCapsFontSizeMultiplier = 0.7f;
     40 const float contextDPI = 72.0f;
     41 static inline float scaleEmToUnits(float x, unsigned unitsPerEm) { return x * (contextDPI / (contextDPI * unitsPerEm)); }
     42 
     43 wxFontProperties::wxFontProperties(wxFont* font):
     44 m_ascent(0), m_descent(0), m_lineGap(0), m_lineSpacing(0), m_xHeight(0)
     45 {
     46     CGFontRef cgFont;
     47 
     48 #ifdef wxOSX_USE_CORE_TEXT && wxOSX_USE_CORE_TEXT
     49     cgFont = CTFontCopyGraphicsFont((CTFontRef)font->OSXGetCTFont(), NULL);
     50 #else
     51     ATSFontRef fontRef;
     52 
     53     fontRef = FMGetATSFontRefFromFont(font->MacGetATSUFontID());
     54 
     55     if (fontRef)
     56         cgFont = CGFontCreateWithPlatformFont((void*)&fontRef);
     57 #endif
     58 
     59     if (cgFont) {
     60         int iAscent;
     61         int iDescent;
     62         int iLineGap;
     63         unsigned unitsPerEm;
     64 #ifdef BUILDING_ON_TIGER
     65         wkGetFontMetrics(cgFont, &iAscent, &iDescent, &iLineGap, &unitsPerEm);
     66 #else
     67         iAscent = CGFontGetAscent(cgFont);
     68         iDescent = CGFontGetDescent(cgFont);
     69         iLineGap = CGFontGetLeading(cgFont);
     70         unitsPerEm = CGFontGetUnitsPerEm(cgFont);
     71 #endif
     72         float pointSize = font->GetPointSize();
     73         float fAscent = scaleEmToUnits(iAscent, unitsPerEm) * pointSize;
     74         float fDescent = -scaleEmToUnits(iDescent, unitsPerEm) * pointSize;
     75         float fLineGap = scaleEmToUnits(iLineGap, unitsPerEm) * pointSize;
     76 
     77         m_ascent = lroundf(fAscent);
     78         m_descent = lroundf(fDescent);
     79         m_lineGap = lroundf(fLineGap);
     80         wxCoord xHeight = 0;
     81         GetTextExtent(*font, wxT("x"), NULL, &xHeight, NULL, NULL);
     82         m_xHeight = lroundf(xHeight);
     83         m_lineSpacing = m_ascent + m_descent + m_lineGap;
     84 
     85     }
     86 
     87     if (cgFont)
     88         CGFontRelease(cgFont);
     89 
     90 }
     91 
     92 bool wxFontContainsCharacters(void* font, const UChar* characters, int length)
     93 {
     94     NSString* string = [[NSString alloc] initWithCharactersNoCopy:const_cast<unichar*>(characters) length:length freeWhenDone:NO];
     95     NSCharacterSet* set = [[(NSFont*)font coveredCharacterSet] invertedSet];
     96     bool result = set && [string rangeOfCharacterFromSet:set].location == NSNotFound;
     97     [string release];
     98     return result;
     99 }
    100 
    101 void GetTextExtent( const wxFont& font, const wxString& str, wxCoord *width, wxCoord *height,
    102                             wxCoord *descent, wxCoord *externalLeading )
    103 {
    104     wxGraphicsContext * const gc = wxGraphicsContext::Create();
    105 
    106     gc->SetFont(font, *wxBLACK); // colour doesn't matter but must be specified
    107     struct GCTextExtent
    108     {
    109         wxDouble width, height, descent, externalLeading;
    110     } e;
    111     gc->GetTextExtent(str, &e.width, &e.height, &e.descent, &e.externalLeading);
    112     if ( width )
    113         *width = wxCoord(e.width + .5);
    114     if ( height )
    115         *height = wxCoord(e.height + .5);
    116     if ( descent )
    117         *descent = wxCoord(e.descent + .5);
    118     if ( externalLeading )
    119         *externalLeading = wxCoord(e.externalLeading + .5);
    120 
    121     delete gc;
    122 }
    123