FontPlatformDataHarfBuzz.cpp [plain text]
#include "config.h"
#include "FontPlatformData.h"
#include "NotImplemented.h"
#include "PlatformString.h"
#include "PlatformSupport.h"
#include "SkAdvancedTypefaceMetrics.h"
#include "SkFontHost.h"
#include "SkPaint.h"
#include "SkTypeface.h"
#include <wtf/text/StringImpl.h>
namespace WebCore {
static SkPaint::Hinting skiaHinting = SkPaint::kNormal_Hinting;
static bool isSkiaAntiAlias = true;
static bool isSkiaSubpixelGlyphs = false;
void FontPlatformData::setHinting(SkPaint::Hinting hinting)
{
skiaHinting = hinting;
}
void FontPlatformData::setAntiAlias(bool isAntiAlias)
{
isSkiaAntiAlias = isAntiAlias;
}
void FontPlatformData::setSubpixelGlyphs(bool isSubpixelGlyphs)
{
isSkiaSubpixelGlyphs = isSubpixelGlyphs;
}
FontPlatformData::FontPlatformData(const FontPlatformData& src)
: m_typeface(src.m_typeface)
, m_family(src.m_family)
, m_textSize(src.m_textSize)
, m_emSizeInFontUnits(src.m_emSizeInFontUnits)
, m_fakeBold(src.m_fakeBold)
, m_fakeItalic(src.m_fakeItalic)
, m_orientation(src.m_orientation)
, m_textOrientation(src.m_textOrientation)
, m_style(src.m_style)
, m_harfbuzzFace(src.m_harfbuzzFace)
{
SkSafeRef(m_typeface);
}
FontPlatformData::FontPlatformData(SkTypeface* tf, const char* family, float textSize, bool fakeBold, bool fakeItalic, FontOrientation orientation, TextOrientation textOrientation)
: m_typeface(tf)
, m_family(family)
, m_textSize(textSize)
, m_emSizeInFontUnits(0)
, m_fakeBold(fakeBold)
, m_fakeItalic(fakeItalic)
, m_orientation(orientation)
, m_textOrientation(textOrientation)
{
SkSafeRef(m_typeface);
querySystemForRenderStyle();
}
FontPlatformData::FontPlatformData(const FontPlatformData& src, float textSize)
: m_typeface(src.m_typeface)
, m_family(src.m_family)
, m_textSize(textSize)
, m_emSizeInFontUnits(src.m_emSizeInFontUnits)
, m_fakeBold(src.m_fakeBold)
, m_fakeItalic(src.m_fakeItalic)
, m_orientation(src.m_orientation)
, m_textOrientation(src.m_textOrientation)
, m_harfbuzzFace(src.m_harfbuzzFace)
{
SkSafeRef(m_typeface);
querySystemForRenderStyle();
}
FontPlatformData::~FontPlatformData()
{
SkSafeUnref(m_typeface);
}
int FontPlatformData::emSizeInFontUnits() const
{
if (m_emSizeInFontUnits)
return m_emSizeInFontUnits;
#if OS(ANDROID)
m_emSizeInFontUnits = SkFontHost::GetUnitsPerEm(m_typeface->uniqueID());
#else
SkAdvancedTypefaceMetrics* metrics = m_typeface->getAdvancedTypefaceMetrics(SkAdvancedTypefaceMetrics::kNo_PerGlyphInfo);
m_emSizeInFontUnits = metrics->fEmSize;
metrics->unref();
#endif
return m_emSizeInFontUnits;
}
FontPlatformData& FontPlatformData::operator=(const FontPlatformData& src)
{
SkRefCnt_SafeAssign(m_typeface, src.m_typeface);
m_family = src.m_family;
m_textSize = src.m_textSize;
m_fakeBold = src.m_fakeBold;
m_fakeItalic = src.m_fakeItalic;
m_harfbuzzFace = src.m_harfbuzzFace;
m_orientation = src.m_orientation;
m_textOrientation = src.m_textOrientation;
m_style = src.m_style;
m_emSizeInFontUnits = src.m_emSizeInFontUnits;
return *this;
}
#ifndef NDEBUG
String FontPlatformData::description() const
{
return String();
}
#endif
void FontPlatformData::setupPaint(SkPaint* paint) const
{
const float ts = m_textSize >= 0 ? m_textSize : 12;
paint->setAntiAlias(m_style.useAntiAlias == FontRenderStyle::NoPreference ? isSkiaAntiAlias : m_style.useAntiAlias);
switch (m_style.useHinting) {
case FontRenderStyle::NoPreference:
paint->setHinting(skiaHinting);
break;
case 0:
paint->setHinting(SkPaint::kNo_Hinting);
break;
default:
paint->setHinting(static_cast<SkPaint::Hinting>(m_style.hintStyle));
break;
}
paint->setEmbeddedBitmapText(m_style.useBitmaps);
paint->setTextSize(SkFloatToScalar(ts));
paint->setTypeface(m_typeface);
paint->setFakeBoldText(m_fakeBold);
paint->setTextSkewX(m_fakeItalic ? -SK_Scalar1 / 4 : 0);
paint->setAutohinted(m_style.useAutoHint);
if (m_style.useAntiAlias == 1 || (m_style.useAntiAlias == FontRenderStyle::NoPreference && isSkiaAntiAlias))
paint->setLCDRenderText(m_style.useSubpixel == FontRenderStyle::NoPreference ? isSkiaSubpixelGlyphs : m_style.useSubpixel);
}
SkFontID FontPlatformData::uniqueID() const
{
return m_typeface->uniqueID();
}
bool FontPlatformData::operator==(const FontPlatformData& a) const
{
bool typefacesEqual;
if (m_typeface == hashTableDeletedFontValue()
|| a.m_typeface == hashTableDeletedFontValue()
|| !m_typeface
|| !a.m_typeface)
typefacesEqual = m_typeface == a.m_typeface;
else
typefacesEqual = SkTypeface::Equal(m_typeface, a.m_typeface);
return typefacesEqual
&& m_textSize == a.m_textSize
&& m_fakeBold == a.m_fakeBold
&& m_fakeItalic == a.m_fakeItalic
&& m_orientation == a.m_orientation
&& m_textOrientation == a.m_textOrientation
&& m_style == a.m_style;
}
unsigned FontPlatformData::hash() const
{
unsigned h = SkTypeface::UniqueID(m_typeface);
h ^= 0x01010101 * ((static_cast<int>(m_textOrientation) << 3) | (static_cast<int>(m_orientation) << 2) | (static_cast<int>(m_fakeBold) << 1) | static_cast<int>(m_fakeItalic));
uint32_t textSizeBytes;
memcpy(&textSizeBytes, &m_textSize, sizeof(uint32_t));
h ^= textSizeBytes;
return h;
}
bool FontPlatformData::isFixedPitch() const
{
notImplemented();
return false;
}
HarfbuzzFace* FontPlatformData::harfbuzzFace() const
{
if (!m_harfbuzzFace)
m_harfbuzzFace = HarfbuzzFace::create(const_cast<FontPlatformData*>(this));
return m_harfbuzzFace.get();
}
void FontPlatformData::querySystemForRenderStyle()
{
if (!m_family.length()) {
m_style.useBitmaps = FontRenderStyle::NoPreference;
m_style.useAutoHint = FontRenderStyle::NoPreference;
m_style.useHinting = FontRenderStyle::NoPreference;
m_style.useAntiAlias = FontRenderStyle::NoPreference;
m_style.useSubpixel = FontRenderStyle::NoPreference;
return;
}
PlatformSupport::getRenderStyleForStrike(m_family.data(), (((int)m_textSize) << 2) | (m_typeface->style() & 3), &m_style);
}
}