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/*
* Copyright (C) 2007 Nicholas Shanks <contact@nickshanks.com>
* Copyright (C) 2008 Apple Inc. All rights reserved.
*
* 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.
*/
#include "config.h"
#include "platform/fonts/FontDescription.h"
#include "platform/RuntimeEnabledFeatures.h"
#include "wtf/text/AtomicStringHash.h"
#include "wtf/text/StringHash.h"
namespace WebCore {
struct SameSizeAsFontDescription {
FontFamily familyList;
RefPtr<FontFeatureSettings> m_featureSettings;
String locale;
float sizes[4];
// FXIME: Make them fit into one word.
uint32_t bitfields;
uint32_t bitfields2 : 7;
};
COMPILE_ASSERT(sizeof(FontDescription) == sizeof(SameSizeAsFontDescription), FontDescription_should_stay_small);
TypesettingFeatures FontDescription::s_defaultTypesettingFeatures = 0;
bool FontDescription::s_useSubpixelTextPositioning = false;
FontWeight FontDescription::lighterWeight(void) const
{
switch (m_weight) {
case FontWeight100:
case FontWeight200:
case FontWeight300:
case FontWeight400:
case FontWeight500:
return FontWeight100;
case FontWeight600:
case FontWeight700:
return FontWeight400;
case FontWeight800:
case FontWeight900:
return FontWeight700;
}
ASSERT_NOT_REACHED();
return FontWeightNormal;
}
FontWeight FontDescription::bolderWeight(void) const
{
switch (m_weight) {
case FontWeight100:
case FontWeight200:
case FontWeight300:
return FontWeight400;
case FontWeight400:
case FontWeight500:
return FontWeight700;
case FontWeight600:
case FontWeight700:
case FontWeight800:
case FontWeight900:
return FontWeight900;
}
ASSERT_NOT_REACHED();
return FontWeightNormal;
}
FontTraits FontDescription::traits() const
{
return FontTraits(style(), variant(), weight(), stretch());
}
void FontDescription::setTraits(FontTraits traits)
{
setStyle(traits.style());
setVariant(traits.variant());
setWeight(traits.weight());
setStretch(traits.stretch());
}
FontDescription FontDescription::makeNormalFeatureSettings() const
{
FontDescription normalDescription(*this);
normalDescription.setFeatureSettings(nullptr);
return normalDescription;
}
float FontDescription::effectiveFontSize() const
{
float size = (RuntimeEnabledFeatures::subpixelFontScalingEnabled())
? computedSize()
: computedPixelSize();
// Ensure that the effective precision matches the font-cache precision.
// This guarantees that the same precision is used regardless of cache status.
return floorf(size * FontCacheKey::precisionMultiplier()) / FontCacheKey::precisionMultiplier();
}
FontCacheKey FontDescription::cacheKey(const AtomicString& familyName, FontTraits desiredTraits) const
{
FontTraits fontTraits = desiredTraits.mask()
? desiredTraits
: traits();
unsigned options =
static_cast<unsigned>(m_syntheticItalic) << 7 | // bit 8
static_cast<unsigned>(m_syntheticBold) << 6 | // bit 7
static_cast<unsigned>(m_fontSmoothing) << 4 | // bits 5-6
static_cast<unsigned>(m_textRendering) << 2 | // bits 3-4
static_cast<unsigned>(m_orientation) << 1 | // bit 2
static_cast<unsigned>(m_subpixelTextPosition); // bit 1
return FontCacheKey(familyName, effectiveFontSize(), options | fontTraits.mask() << 8);
}
void FontDescription::setDefaultTypesettingFeatures(TypesettingFeatures typesettingFeatures)
{
s_defaultTypesettingFeatures = typesettingFeatures;
}
TypesettingFeatures FontDescription::defaultTypesettingFeatures()
{
return s_defaultTypesettingFeatures;
}
void FontDescription::updateTypesettingFeatures() const
{
m_typesettingFeatures = s_defaultTypesettingFeatures;
switch (textRendering()) {
case AutoTextRendering:
break;
case OptimizeSpeed:
m_typesettingFeatures &= ~(WebCore::Kerning | Ligatures);
break;
case GeometricPrecision:
case OptimizeLegibility:
m_typesettingFeatures |= WebCore::Kerning | Ligatures;
break;
}
switch (kerning()) {
case FontDescription::NoneKerning:
m_typesettingFeatures &= ~WebCore::Kerning;
break;
case FontDescription::NormalKerning:
m_typesettingFeatures |= WebCore::Kerning;
break;
case FontDescription::AutoKerning:
break;
}
// As per CSS (http://dev.w3.org/csswg/css-text-3/#letter-spacing-property),
// When the effective letter-spacing between two characters is not zero (due to
// either justification or non-zero computed letter-spacing), user agents should
// not apply optional ligatures.
if (m_letterSpacing == 0) {
switch (commonLigaturesState()) {
case FontDescription::DisabledLigaturesState:
m_typesettingFeatures &= ~Ligatures;
break;
case FontDescription::EnabledLigaturesState:
m_typesettingFeatures |= Ligatures;
break;
case FontDescription::NormalLigaturesState:
break;
}
if (discretionaryLigaturesState() == FontDescription::EnabledLigaturesState
|| historicalLigaturesState() == FontDescription::EnabledLigaturesState
|| contextualLigaturesState() == FontDescription::EnabledLigaturesState) {
m_typesettingFeatures |= WebCore::Ligatures;
}
}
}
} // namespace WebCore
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