SimpleFontDataMac.mm [plain text]
/*
* Copyright (C) 2005, 2006 Apple Computer, Inc. All rights reserved.
* Copyright (C) 2006 Alexey Proskuryakov
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. Neither the name of Apple Computer, Inc. ("Apple") nor the names of
* its contributors may be used to endorse or promote products derived
* from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY APPLE AND ITS CONTRIBUTORS "AS IS" AND ANY
* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL APPLE OR ITS CONTRIBUTORS BE LIABLE FOR ANY
* DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#import "config.h"
#import "SimpleFontData.h"
#import "BlockExceptions.h"
#import "Color.h"
#import "FloatRect.h"
#import "Font.h"
#import "FontCache.h"
#import "FontDescription.h"
#import "SharedBuffer.h"
#import "WebCoreSystemInterface.h"
#import <CoreText/CoreText.h>
#import <float.h>
#import <unicode/uchar.h>
#import <wtf/Assertions.h>
#import <wtf/StdLibExtras.h>
#import <wtf/RetainPtr.h>
#import <wtf/UnusedParam.h>
#include <wtf/UnusedParam.h>
using namespace std;
using namespace std;
namespace WebCore {
const float smallCapsFontSizeMultiplier = 0.7f;
static inline float scaleEmToUnits(float x, unsigned unitsPerEm) { return x / unitsPerEm; }
void SimpleFontData::platformInit()
{
m_syntheticBoldOffset = m_platformData.m_syntheticBold ? ceilf(m_platformData.size() / 24.0f) : 0.f;
m_spaceGlyph = 0;
m_spaceWidth = 0;
m_adjustedSpaceWidth = 0;
if (GSFontRef gsFont = m_platformData.font()) {
m_ascent = ceilf(GSFontGetAscent(gsFont));
m_descent = ceilf(-GSFontGetDescent(gsFont));
m_lineSpacing = GSFontGetLineSpacing(gsFont);
m_lineGap = GSFontGetLineGap(gsFont);
m_xHeight = GSFontGetXHeight(gsFont);
m_unitsPerEm = GSFontGetUnitsPerEm(gsFont);
} else {
CGFontRef cgFont = m_platformData.cgFont();
m_unitsPerEm = CGFontGetUnitsPerEm(cgFont);
float pointSize = m_platformData.size();
m_ascent = lroundf(scaleEmToUnits(CGFontGetAscent(cgFont), m_unitsPerEm) * pointSize);
m_descent = lroundf(-scaleEmToUnits(CGFontGetDescent(cgFont), m_unitsPerEm) * pointSize);
m_lineGap = lroundf(scaleEmToUnits(CGFontGetLeading(cgFont), m_unitsPerEm) * pointSize);
m_xHeight = scaleEmToUnits(CGFontGetXHeight(cgFont), m_unitsPerEm) * pointSize;
m_lineSpacing = m_ascent + m_descent + m_lineGap;
}
if (!m_platformData.m_isEmoji)
return;
int thirdOfSize = m_platformData.size() / 3;
m_ascent = thirdOfSize;
m_descent = thirdOfSize;
m_lineGap = thirdOfSize;
m_lineSpacing = 0;
}
void SimpleFontData::platformCharWidthInit()
{
m_avgCharWidth = 0;
m_maxCharWidth = 0;
// Fallback to a cross-platform estimate, which will populate these values if they are non-positive.
initCharWidths();
}
void SimpleFontData::platformDestroy()
{
}
SimpleFontData* SimpleFontData::smallCapsFontData(const FontDescription& fontDescription) const
{
if (!m_smallCapsFontData) {
if (isCustomFont()) {
FontPlatformData smallCapsFontData(m_platformData);
smallCapsFontData.m_size = smallCapsFontData.m_size * smallCapsFontSizeMultiplier;
m_smallCapsFontData = new SimpleFontData(smallCapsFontData, true, false);
} else {
BEGIN_BLOCK_OBJC_EXCEPTIONS;
GSFontTraitMask fontTraits= GSFontGetTraits(m_platformData.font());
FontPlatformData smallCapsFont(GSFontCreateWithName(GSFontGetFamilyName(m_platformData.font()), fontTraits, GSFontGetSize(m_platformData.font()) * smallCapsFontSizeMultiplier));
// AppKit resets the type information (screen/printer) when you convert a font to a different size.
// We have to fix up the font that we're handed back.
UNUSED_PARAM(fontDescription);
if (smallCapsFont.font()) {
if (m_platformData.m_syntheticBold)
fontTraits |= GSBoldFontMask;
if (m_platformData.m_syntheticOblique)
fontTraits |= GSItalicFontMask;
GSFontTraitMask smallCapsFontTraits= GSFontGetTraits(smallCapsFont.font());
smallCapsFont.m_syntheticBold = (fontTraits & GSBoldFontMask) && !(smallCapsFontTraits & GSBoldFontMask);
smallCapsFont.m_syntheticOblique = (fontTraits & GSItalicFontMask) && !(smallCapsFontTraits & GSItalicFontMask);
m_smallCapsFontData = fontCache()->getCachedFontData(&smallCapsFont);
}
END_BLOCK_OBJC_EXCEPTIONS;
}
}
return m_smallCapsFontData;
}
bool SimpleFontData::containsCharacters(const UChar* characters, int length) const
{
UNUSED_PARAM(characters);
UNUSED_PARAM(length);
return 0;
}
void SimpleFontData::determinePitch()
{
GSFontRef f = m_platformData.font();
m_treatAsFixedPitch = false;
// GSFont is null in the case of SVG fonts for example.
if (f) {
const char *fullName = GSFontGetFullName(f);
const char *familyName = GSFontGetFamilyName(f);
m_treatAsFixedPitch = (GSFontIsFixedPitch(f) || (fullName && (strcasecmp(fullName, "Osaka-Mono") == 0 || strcasecmp(fullName, "MS-PGothic") == 0)));
if (familyName && strcasecmp(familyName, "Courier New") == 0) // Special case Courier New to not be treated as fixed pitch, as this will make use of a hacked space width which is undesireable for iPhone (see rdar://6269783)
m_treatAsFixedPitch = false;
}
}
FloatRect SimpleFontData::platformBoundsForGlyph(Glyph glyph) const
{
FloatRect boundingBox;
#ifndef BUILDING_ON_TIGER
CGRect box;
CGFontGetGlyphBBoxes(platformData().cgFont(), &glyph, 1, &box);
float pointSize = platformData().m_size;
CGFloat scale = pointSize / unitsPerEm();
boundingBox = CGRectApplyAffineTransform(box, CGAffineTransformMakeScale(scale, -scale));
#else
// FIXME: Custom fonts don't have NSFonts, so this function doesn't compute correct bounds for these on Tiger.
if (!m_platformData.font())
return boundingBox;
boundingBox = [m_platformData.font() boundingRectForGlyph:glyph];
#endif
if (m_syntheticBoldOffset)
boundingBox.setWidth(boundingBox.width() + m_syntheticBoldOffset);
return boundingBox;
}
float SimpleFontData::platformWidthForGlyph(Glyph glyph) const
{
if (platformData().m_isEmoji) {
// returns the proper scaled advance for the image size - see Font::drawGlyphs
return std::min(platformData().m_size + (platformData().m_size <= 15.0f ? 4.0f : 6.0f), 22.0f);
}
float pointSize = platformData().m_size;
CGAffineTransform m = CGAffineTransformMakeScale(pointSize, pointSize);
CGSize advance;
static const CGFontRenderingStyle renderingStyle = kCGFontRenderingStyleAntialiasing | kCGFontRenderingStyleSubpixelPositioning | kCGFontRenderingStyleSubpixelQuantization | kCGFontAntialiasingStyleUnfiltered;
if (!CGFontGetGlyphAdvancesForStyle(platformData().cgFont(), &m, renderingStyle, &glyph, 1, &advance)) {
RetainPtr<CFStringRef> fullName(AdoptCF, CGFontCopyFullName(platformData().cgFont()));
LOG_ERROR("Unable to cache glyph widths for %@ %f", fullName.get(), pointSize);
advance.width = 0;
}
return advance.width + m_syntheticBoldOffset;
}
} // namespace WebCore