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/*
* Copyright (C) 2008-2021 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 "CSSSegmentedFontFace.h"
#include "CSSFontFace.h"
#include "Font.h"
#include "FontCache.h"
#include "FontCreationContext.h"
#include "FontDescription.h"
#include "FontPaletteValues.h"
#include "FontSelector.h"
namespace WebCore {
DEFINE_ALLOCATOR_WITH_HEAP_IDENTIFIER(CSSSegmentedFontFace);
CSSSegmentedFontFace::CSSSegmentedFontFace()
{
}
CSSSegmentedFontFace::~CSSSegmentedFontFace()
{
for (auto& face : m_fontFaces)
face->removeClient(*this);
}
void CSSSegmentedFontFace::appendFontFace(Ref<CSSFontFace>&& fontFace)
{
m_cache.clear();
fontFace->addClient(*this);
m_fontFaces.append(WTFMove(fontFace));
}
void CSSSegmentedFontFace::fontLoaded(CSSFontFace&)
{
m_cache.clear();
}
class CSSFontAccessor final : public FontAccessor {
public:
static Ref<CSSFontAccessor> create(CSSFontFace& fontFace, const FontDescription& fontDescription, const FontPaletteValues& fontPaletteValues, RefPtr<FontFeatureValues> fontFeatureValues, bool syntheticBold, bool syntheticItalic)
{
return adoptRef(*new CSSFontAccessor(fontFace, fontDescription, fontPaletteValues, fontFeatureValues, syntheticBold, syntheticItalic));
}
const Font* font(ExternalResourceDownloadPolicy policy) const final
{
if (!m_result || (policy == ExternalResourceDownloadPolicy::Allow
&& (m_fontFace->status() == CSSFontFace::Status::Pending || m_fontFace->status() == CSSFontFace::Status::Loading || m_fontFace->status() == CSSFontFace::Status::TimedOut))) {
const auto result = m_fontFace->font(m_fontDescription, m_syntheticBold, m_syntheticItalic, policy, m_fontPaletteValues, m_fontFeatureValues);
if (!m_result)
m_result = result;
}
return m_result.value().get();
}
private:
CSSFontAccessor(CSSFontFace& fontFace, const FontDescription& fontDescription, const FontPaletteValues& fontPaletteValues, RefPtr<FontFeatureValues> fontFeatureValues, bool syntheticBold, bool syntheticItalic)
: m_fontFace(fontFace)
, m_fontDescription(fontDescription)
, m_fontFeatureValues(fontFeatureValues)
, m_fontPaletteValues(fontPaletteValues)
, m_syntheticBold(syntheticBold)
, m_syntheticItalic(syntheticItalic)
{
}
bool isLoading() const final
{
return m_result && m_result.value() && m_result.value()->isInterstitial();
}
mutable std::optional<RefPtr<Font>> m_result; // Caches nullptr too
mutable Ref<CSSFontFace> m_fontFace;
FontDescription m_fontDescription;
RefPtr<FontFeatureValues> m_fontFeatureValues;
FontPaletteValues m_fontPaletteValues;
bool m_syntheticBold;
bool m_syntheticItalic;
};
static void appendFont(FontRanges& ranges, Ref<FontAccessor>&& fontAccessor, const Vector<CSSFontFace::UnicodeRange>& unicodeRanges)
{
if (unicodeRanges.isEmpty()) {
ranges.appendRange({ 0, 0x7FFFFFFF, WTFMove(fontAccessor) });
return;
}
for (auto& range : unicodeRanges)
ranges.appendRange({ range.from, range.to, fontAccessor.copyRef() });
}
FontRanges CSSSegmentedFontFace::fontRanges(const FontDescription& fontDescription, const FontPaletteValues& fontPaletteValues, RefPtr<FontFeatureValues> fontFeatureValues)
{
auto addResult = m_cache.add(std::make_tuple(FontDescriptionKey(fontDescription), fontPaletteValues), FontRanges());
auto& ranges = addResult.iterator->value;
if (!addResult.isNewEntry)
return ranges;
auto desiredRequest = fontDescription.fontSelectionRequest();
for (auto& face : m_fontFaces) {
if (face->computeFailureState())
continue;
auto selectionCapabilities = face->fontSelectionCapabilities();
bool syntheticBold = fontDescription.hasAutoFontSynthesisWeight() && !isFontWeightBold(selectionCapabilities.weight.maximum) && isFontWeightBold(desiredRequest.weight);
bool syntheticItalic = fontDescription.hasAutoFontSynthesisStyle() && !isItalic(selectionCapabilities.slope.maximum) && isItalic(desiredRequest.slope);
// Metrics used for layout come from FontRanges::fontForFirstRange(), which assumes that the first font is non-null.
auto fontAccessor = CSSFontAccessor::create(face, fontDescription, fontPaletteValues, fontFeatureValues, syntheticBold, syntheticItalic);
if (ranges.isNull() && !fontAccessor->font(ExternalResourceDownloadPolicy::Forbid))
continue;
appendFont(ranges, WTFMove(fontAccessor), face->ranges());
}
ranges.shrinkToFit();
return ranges;
}
}
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