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/*
* Copyright 2009, The Android Open Source Project
* Copyright (C) 2006 Apple Computer, 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.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS ``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 "FontPlatformData.h"
#include "NotImplemented.h"
#include "SimpleFontData.h"
#include "SkPaint.h"
#include "SkTypeface.h"
#include "SkUtils.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");
}
static char* AtomicStringToUTF8String(const AtomicString& utf16)
{
SkASSERT(sizeof(uint16_t) == sizeof(utf16.characters()[0]));
const uint16_t* uni = (uint16_t*)utf16.characters();
size_t bytes = SkUTF16_ToUTF8(uni, utf16.length(), 0);
char* utf8 = (char*)sk_malloc_throw(bytes + 1);
(void)SkUTF16_ToUTF8(uni, utf16.length(), utf8);
utf8[bytes] = 0;
return utf8;
}
void FontCache::platformInit()
{
}
const SimpleFontData* FontCache::getFontDataForCharacters(const Font& font, const UChar* characters, int length)
{
// since all of our fonts logically map to the fallback, we can always claim
// that each font supports all characters.
return font.primaryFont();
}
SimpleFontData* FontCache::getSimilarFontPlatformData(const Font& font)
{
return 0;
}
SimpleFontData* FontCache::getLastResortFallbackFont(const FontDescription& description)
{
static const AtomicString sansStr("sans-serif");
static const AtomicString serifStr("serif");
static const AtomicString monospaceStr("monospace");
FontPlatformData* fontPlatformData = 0;
switch (description.genericFamily()) {
case FontDescription::SerifFamily:
fontPlatformData = getCachedFontPlatformData(description, serifStr);
break;
case FontDescription::MonospaceFamily:
fontPlatformData = getCachedFontPlatformData(description, monospaceStr);
break;
case FontDescription::SansSerifFamily:
default:
fontPlatformData = getCachedFontPlatformData(description, sansStr);
break;
}
ASSERT(fontPlatformData);
return getCachedFontData(fontPlatformData);
}
FontPlatformData* FontCache::createFontPlatformData(const FontDescription& fontDescription, const AtomicString& family)
{
char* storage = 0;
const char* name = 0;
FontPlatformData* result = 0;
if (family.length()) {
storage = AtomicStringToUTF8String(family);
name = storage;
} else
name = getFallbackFontName(fontDescription);
int style = SkTypeface::kNormal;
if (fontDescription.weight() >= FontWeightBold)
style |= SkTypeface::kBold;
if (fontDescription.italic())
style |= SkTypeface::kItalic;
// CreateFromName always returns a typeface, falling back to a default font
// if the one requested is not found. Calling Equal() with a null pointer
// serves to compare the returned font against the default, with the caveat
// that the default is always of normal style. If we detect the default, we
// ignore it and allow WebCore to give us the next font on the CSS fallback
// list. The only exception is if the family name is a commonly used generic
// family, as when called by getSimilarFontPlatformData() and
// getLastResortFallbackFont(). In this case, the default font is an
// acceptable result.
SkTypeface* tf = SkTypeface::CreateFromName(name, SkTypeface::kNormal);
if (!SkTypeface::Equal(tf, 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) {
tf->unref();
tf = SkTypeface::CreateFromName(name, (SkTypeface::Style)style);
}
result = new FontPlatformData(tf, fontDescription.computedSize(),
(style & SkTypeface::kBold) && !tf->isBold(),
(style & SkTypeface::kItalic) && !tf->isItalic());
}
tf->unref();
sk_free(storage);
return result;
}
// new as of SVN change 36269, Sept 8, 2008
void FontCache::getTraitsInFamily(const AtomicString& familyName, Vector<unsigned>& traitsMasks)
{
// Don't understand this yet, but it seems safe to leave unimplemented
}
}
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