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/*
* Copyright (C) 2008, 2009, 2015 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.
*
* THIS SOFTWARE IS PROVIDED BY APPLE INC. ``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 INC. 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 "FontRanges.h"
#include "Font.h"
#include "FontSelector.h"
#include <wtf/Assertions.h>
#include <wtf/text/CharacterProperties.h>
#include <wtf/text/WTFString.h>
namespace WebCore {
const Font* FontRanges::Range::font(ExternalResourceDownloadPolicy policy) const
{
return m_fontAccessor->font(policy);
}
FontRanges::FontRanges(FontRanges&& other, IsGenericFontFamily isGenericFontFamily)
: m_ranges { WTFMove(other.m_ranges) }
, m_isGenericFontFamily { isGenericFontFamily }
{
}
class TrivialFontAccessor final : public FontAccessor {
public:
static Ref<TrivialFontAccessor> create(Ref<Font>&& font)
{
return adoptRef(*new TrivialFontAccessor(WTFMove(font)));
}
private:
TrivialFontAccessor(RefPtr<Font>&& font)
: m_font(WTFMove(font))
{
}
const Font* font(ExternalResourceDownloadPolicy) const final
{
return m_font.get();
}
bool isLoading() const final
{
return m_font->isInterstitial();
}
RefPtr<Font> m_font;
};
FontRanges::FontRanges(RefPtr<Font>&& font)
{
if (font)
m_ranges.append(Range { 0, 0x7FFFFFFF, TrivialFontAccessor::create(font.releaseNonNull()) });
}
FontRanges::~FontRanges() = default;
GlyphData FontRanges::glyphDataForCharacter(char32_t character, ExternalResourceDownloadPolicy policy) const
{
const Font* resultFont = nullptr;
if (isGenericFontFamily() && isPrivateUseAreaCharacter(character))
return GlyphData();
for (auto& range : m_ranges) {
if (range.from() <= character && character <= range.to()) {
if (auto* font = range.font(policy)) {
if (font->isInterstitial()) {
policy = ExternalResourceDownloadPolicy::Forbid;
if (!resultFont)
resultFont = font;
} else {
auto glyphData = font->glyphDataForCharacter(character);
if (glyphData.isValid()) {
auto* glyphDataFont = glyphData.font.get();
if (glyphDataFont && glyphDataFont->visibility() == Font::Visibility::Visible && resultFont && resultFont->visibility() == Font::Visibility::Invisible)
return GlyphData(glyphData.glyph, &glyphDataFont->invisibleFont());
return glyphData;
}
}
}
}
}
if (resultFont) {
// We want higher-level code to be able to differentiate between
// "The interstitial font doesn't have the character" and
// "The real downloaded font doesn't have the character".
GlyphData result = resultFont->glyphDataForCharacter(character);
if (!result.font)
result.font = resultFont;
return result;
}
return GlyphData();
}
const Font* FontRanges::fontForCharacter(char32_t character) const
{
return glyphDataForCharacter(character, ExternalResourceDownloadPolicy::Allow).font.get();
}
const Font& FontRanges::fontForFirstRange() const
{
auto* font = m_ranges[0].font(ExternalResourceDownloadPolicy::Forbid);
ASSERT(font);
return *font;
}
bool FontRanges::isLoading() const
{
for (auto& range : m_ranges) {
if (range.fontAccessor().isLoading())
return true;
}
return false;
}
} // namespace WebCore
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