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/*
* Copyright (C) 2006, 2007 Apple Computer, Inc.
* Copyright (c) 2006, 2007, 2008, 2009, 2012 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 "platform/fonts/FontCache.h"
#include "RuntimeEnabledFeatures.h"
#include "SkFontMgr.h"
#include "SkTypeface_win.h"
#include "platform/fonts/FontDescription.h"
#include "platform/fonts/SimpleFontData.h"
#include "platform/fonts/win/FontFallbackWin.h"
#include "platform/fonts/win/FontPlatformDataWin.h"
namespace WebCore {
FontCache::FontCache()
: m_purgePreventCount(0)
{
SkFontMgr* fontManager = 0;
// Prefer DirectWrite (if runtime feature is enabled) but fallback
// to GDI on platforms where DirectWrite is not supported.
if (RuntimeEnabledFeatures::directWriteEnabled())
fontManager = SkFontMgr_New_DirectWrite();
// Subpixel text positioning is not supported by the GDI backend.
m_useSubpixelPositioning = fontManager
? RuntimeEnabledFeatures::subpixelFontScalingEnabled()
: false;
if (!fontManager)
fontManager = SkFontMgr_New_GDI();
m_fontManager = adoptPtr(fontManager);
}
static bool fontContainsCharacter(const FontPlatformData* fontData, const wchar_t* family, UChar32 character)
{
SkPaint paint;
fontData->setupPaint(&paint);
paint.setTextEncoding(SkPaint::kUTF32_TextEncoding);
uint16_t glyph;
paint.textToGlyphs(&character, sizeof(character), &glyph);
return glyph;
}
// Given the desired base font, this will create a SimpleFontData for a specific
// font that can be used to render the given range of characters.
PassRefPtr<SimpleFontData> FontCache::platformFallbackForCharacter(const FontDescription& fontDescription, UChar32 character, const SimpleFontData*, bool)
{
// FIXME: Consider passing fontDescription.dominantScript()
// to GetFallbackFamily here.
UScriptCode script;
const wchar_t* family = getFallbackFamily(character,
fontDescription.genericFamily(),
&script);
FontPlatformData* data = 0;
if (family)
data = getFontPlatformData(fontDescription, AtomicString(family, wcslen(family)));
// Last resort font list : PanUnicode. CJK fonts have a pretty
// large repertoire. Eventually, we need to scan all the fonts
// on the system to have a Firefox-like coverage.
// Make sure that all of them are lowercased.
const static wchar_t* const cjkFonts[] = {
L"arial unicode ms",
L"ms pgothic",
L"simsun",
L"gulim",
L"pmingliu",
L"wenquanyi zen hei", // Partial CJK Ext. A coverage but more widely known to Chinese users.
L"ar pl shanheisun uni",
L"ar pl zenkai uni",
L"han nom a", // Complete CJK Ext. A coverage.
L"code2000" // Complete CJK Ext. A coverage.
// CJK Ext. B fonts are not listed here because it's of no use
// with our current non-BMP character handling because we use
// Uniscribe for it and that code path does not go through here.
};
const static wchar_t* const commonFonts[] = {
L"tahoma",
L"arial unicode ms",
L"lucida sans unicode",
L"microsoft sans serif",
L"palatino linotype",
// Six fonts below (and code2000 at the end) are not from MS, but
// once installed, cover a very wide range of characters.
L"dejavu serif",
L"dejavu sasns",
L"freeserif",
L"freesans",
L"gentium",
L"gentiumalt",
L"ms pgothic",
L"simsun",
L"gulim",
L"pmingliu",
L"code2000"
};
const wchar_t* const* panUniFonts = 0;
int numFonts = 0;
if (script == USCRIPT_HAN) {
panUniFonts = cjkFonts;
numFonts = WTF_ARRAY_LENGTH(cjkFonts);
} else {
panUniFonts = commonFonts;
numFonts = WTF_ARRAY_LENGTH(commonFonts);
}
// Font returned from getFallbackFamily may not cover |character|
// because it's based on script to font mapping. This problem is
// critical enough for non-Latin scripts (especially Han) to
// warrant an additional (real coverage) check with fontCotainsCharacter.
int i;
for (i = 0; (!data || !fontContainsCharacter(data, family, character)) && i < numFonts; ++i) {
family = panUniFonts[i];
data = getFontPlatformData(fontDescription, AtomicString(family, wcslen(family)));
}
// When i-th font (0-base) in |panUniFonts| contains a character and
// we get out of the loop, |i| will be |i + 1|. That is, if only the
// last font in the array covers the character, |i| will be numFonts.
// So, we have to use '<=" rather than '<' to see if we found a font
// covering the character.
if (i <= numFonts)
return fontDataFromFontPlatformData(data, DoNotRetain);
return 0;
}
static inline bool equalIgnoringCase(const AtomicString& a, const SkString& b)
{
return equalIgnoringCase(a, AtomicString::fromUTF8(b.c_str()));
}
static bool typefacesMatchesFamily(const SkTypeface* tf, const AtomicString& family)
{
SkTypeface::LocalizedStrings* actualFamilies = tf->createFamilyNameIterator();
bool matchesRequestedFamily = false;
SkTypeface::LocalizedString actualFamily;
while (actualFamilies->next(&actualFamily)) {
if (equalIgnoringCase(family, actualFamily.fString)) {
matchesRequestedFamily = true;
break;
}
}
actualFamilies->unref();
// getFamilyName may return a name not returned by the createFamilyNameIterator.
// Specifically in cases where Windows substitutes the font based on the
// HKLM\SOFTWARE\Microsoft\Windows NT\CurrentVersion\FontSubstitutes registry entries.
if (!matchesRequestedFamily) {
SkString familyName;
tf->getFamilyName(&familyName);
if (equalIgnoringCase(family, familyName))
matchesRequestedFamily = true;
}
return matchesRequestedFamily;
}
FontPlatformData* FontCache::createFontPlatformData(const FontDescription& fontDescription, const AtomicString& family, float fontSize)
{
CString name;
RefPtr<SkTypeface> tf = createTypeface(fontDescription, family, name);
if (!tf)
return 0;
// Windows will always give us a valid pointer here, even if the face name
// is non-existent. We have to double-check and see if the family name was
// really used.
// FIXME: Do we need to use predefined fonts "guaranteed" to exist
// when we're running in layout-test mode?
if (!typefacesMatchesFamily(tf.get(), family)) {
return 0;
}
FontPlatformData* result = new FontPlatformData(tf,
name.data(),
fontSize,
fontDescription.weight() >= FontWeightBold && !tf->isBold() || fontDescription.isSyntheticBold(),
fontDescription.italic() && !tf->isItalic() || fontDescription.isSyntheticItalic(),
fontDescription.orientation(),
m_useSubpixelPositioning);
return result;
}
}
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