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/*
* Copyright (c) 2011 Google 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:
*
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* * 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.
* * Neither the name of Google Inc. 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 THE COPYRIGHT HOLDERS AND 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 THE COPYRIGHT
* OWNER OR 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 "FontCache.h"
#include "Font.h"
#include "FontDescription.h"
#include "FontPlatformData.h"
#include "NotImplemented.h"
#include "SimpleFontData.h"
#include "SkPaint.h"
#include "SkTypeface_android.h"
#include "SkUtils.h"
#include <unicode/locid.h>
#include <wtf/Assertions.h>
#include <wtf/text/AtomicString.h>
#include <wtf/text/CString.h>
namespace WebCore {
static const char* getFallbackFontName(const FontDescription& fontDescription)
{
switch (fontDescription.genericFamily()) {
case FontDescription::StandardFamily:
case FontDescription::SerifFamily:
return "serif";
case FontDescription::SansSerifFamily:
return "sans-serif";
case FontDescription::MonospaceFamily:
return "monospace";
case FontDescription::CursiveFamily:
return "cursive";
case FontDescription::FantasyFamily:
return "fantasy";
case FontDescription::NoFamily:
default:
return "";
}
}
static bool isFallbackFamily(String family)
{
return family.startsWith("-webkit-")
|| equalIgnoringCase(family, "serif")
|| equalIgnoringCase(family, "sans-serif")
|| equalIgnoringCase(family, "sans")
|| equalIgnoringCase(family, "monospace")
|| equalIgnoringCase(family, "cursive")
|| equalIgnoringCase(family, "fantasy")
|| equalIgnoringCase(family, "times") // Skia aliases for serif
|| equalIgnoringCase(family, "times new roman")
|| equalIgnoringCase(family, "palatino")
|| equalIgnoringCase(family, "georgia")
|| equalIgnoringCase(family, "baskerville")
|| equalIgnoringCase(family, "goudy")
|| equalIgnoringCase(family, "ITC Stone Serif")
|| equalIgnoringCase(family, "arial") // Skia aliases for sans-serif
|| equalIgnoringCase(family, "helvetica")
|| equalIgnoringCase(family, "tahoma")
|| equalIgnoringCase(family, "verdana")
|| equalIgnoringCase(family, "courier") // Skia aliases for monospace
|| equalIgnoringCase(family, "courier new")
|| equalIgnoringCase(family, "monaco");
}
void FontCache::platformInit()
{
}
PassRefPtr<SimpleFontData> FontCache::getFontDataForCharacters(const Font& font, const UChar* characters, int length)
{
if (!length)
return 0;
SkUnichar skiaChar;
if (U16_IS_LEAD(characters[0])) {
ASSERT(length >= 2);
skiaChar = U16_GET_SUPPLEMENTARY(characters[0], characters[1]);
} else
skiaChar = characters[0];
SkString skiaFamilyName;
if (!SkGetFallbackFamilyNameForChar(skiaChar, &skiaFamilyName) || skiaFamilyName.isEmpty())
return 0;
return getCachedFontData(getCachedFontPlatformData(font.fontDescription(), AtomicString(skiaFamilyName.c_str()), DoNotRetain), DoNotRetain);
}
PassRefPtr<SimpleFontData> FontCache::getSimilarFontPlatformData(const Font& font)
{
return 0;
}
PassRefPtr<SimpleFontData> FontCache::getLastResortFallbackFont(const FontDescription& description, ShouldRetain shouldRetain)
{
DEFINE_STATIC_LOCAL(const AtomicString, serif, ("Serif", AtomicString::ConstructFromLiteral));
DEFINE_STATIC_LOCAL(const AtomicString, monospace, ("Monospace", AtomicString::ConstructFromLiteral));
DEFINE_STATIC_LOCAL(const AtomicString, sans, ("Sans", AtomicString::ConstructFromLiteral));
FontPlatformData* fontPlatformData = 0;
switch (description.genericFamily()) {
case FontDescription::SerifFamily:
fontPlatformData = getCachedFontPlatformData(description, serif);
break;
case FontDescription::MonospaceFamily:
fontPlatformData = getCachedFontPlatformData(description, monospace);
break;
case FontDescription::SansSerifFamily:
default:
fontPlatformData = getCachedFontPlatformData(description, sans);
break;
}
ASSERT(fontPlatformData);
return getCachedFontData(fontPlatformData, shouldRetain);
}
void FontCache::getTraitsInFamily(const AtomicString& familyName, Vector<unsigned>& traitsMasks)
{
notImplemented();
}
FontPlatformData* FontCache::createFontPlatformData(const FontDescription& fontDescription, const AtomicString& family)
{
const char* name = 0;
CString nameString; // Keeps name valid within scope of this function in case that name is from a family.
// If a fallback font is being created (e.g. "-webkit-monospace"), convert
// it in to the fallback name (e.g. "monospace").
if (!family.length() || family.startsWith("-webkit-"))
name = getFallbackFontName(fontDescription);
else {
nameString = family.string().utf8();
name = nameString.data();
}
int style = SkTypeface::kNormal;
if (fontDescription.weight() >= FontWeightBold)
style |= SkTypeface::kBold;
if (fontDescription.italic())
style |= SkTypeface::kItalic;
SkTypeface* typeface = 0;
FontPlatformData* result = 0;
FallbackScripts fallbackScript = SkGetFallbackScriptFromID(name);
if (SkTypeface_ValidScript(fallbackScript)) {
typeface = SkCreateTypefaceForScript(fallbackScript);
if (typeface)
result = new FontPlatformData(typeface, name, fontDescription.computedSize(),
(style & SkTypeface::kBold) && !typeface->isBold(),
(style & SkTypeface::kItalic) && !typeface->isItalic(),
fontDescription.orientation(),
fontDescription.textOrientation());
} else {
typeface = SkTypeface::CreateFromName(name, SkTypeface::kNormal);
// CreateFromName always returns a typeface, falling back to a default font
// if the one requested could not be found. Calling Equal() with a null
// pointer will compare the returned font against the default, with the
// caveat that the default is always of normal style. When that happens,
// ignore the default font and allow WebCore to provide the next font on the
// CSS fallback list. The only exception to this occurs when the family name
// is a commonly used generic family, which is the case when called by
// getSimilarFontPlatformData() or getLastResortFallbackFont(). In that case
// the default font is an acceptable result.
if (!SkTypeface::Equal(typeface, 0) || isFallbackFamily(family.string())) {
// We had to use normal styling to see if this was a default font. If
// we need bold or italic, replace with the corrected typeface.
if (style != SkTypeface::kNormal) {
typeface->unref();
typeface = SkTypeface::CreateFromName(name, static_cast<SkTypeface::Style>(style));
}
result = new FontPlatformData(typeface, name, fontDescription.computedSize(),
(style & SkTypeface::kBold) && !typeface->isBold(),
(style & SkTypeface::kItalic) && !typeface->isItalic(),
fontDescription.orientation(),
fontDescription.textOrientation());
}
}
SkSafeUnref(typeface);
return result;
}
} // namespace WebCore
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