blob: 331efc1e28e377f99c92a9d9b7736de0cd5e0eb7 [file] [log] [blame]
/*
* Copyright (C) 2007, 2008, 2010, 2011 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 COMPUTER, 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 COMPUTER, 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 "third_party/blink/renderer/core/css/css_font_face_source.h"
#include "third_party/blink/renderer/core/css/css_font_face.h"
#include "third_party/blink/renderer/platform/fonts/font_cache_key.h"
#include "third_party/blink/renderer/platform/fonts/font_description.h"
#include "third_party/blink/renderer/platform/fonts/font_face_creation_params.h"
#include "third_party/blink/renderer/platform/fonts/simple_font_data.h"
namespace {
// An excessive amount of SimpleFontData objects is generated from
// CSSFontFaceSource if a lot of varying FontDescriptions point to a web
// font. These FontDescriptions can vary in size, font-feature-settings or
// font-variation settings. Well known cases are animations of font-variation
// settings, compare crbug.com/778352. For a start, let's reduce this number to
// 1024, which is still a large number and should have enough steps for font
// animations from the same font face source, but avoids unbounded growth.
const size_t kMaxCachedFontData = 1024;
} // namespace
namespace blink {
CSSFontFaceSource::~CSSFontFaceSource() = default;
scoped_refptr<SimpleFontData> CSSFontFaceSource::GetFontData(
const FontDescription& font_description,
const FontSelectionCapabilities& font_selection_capabilities) {
// If the font hasn't loaded or an error occurred, then we've got nothing.
if (!IsValid())
return nullptr;
if (IsLocal()) {
// We're local. Just return a SimpleFontData from the normal cache.
return CreateFontData(font_description, font_selection_capabilities);
}
bool is_unique_match = false;
FontCacheKey key =
font_description.CacheKey(FontFaceCreationParams(), is_unique_match);
// Get or create the font data. Take care to avoid dangling references into
// font_data_table_, because it is modified below during pruning.
scoped_refptr<SimpleFontData> font_data;
{
auto* it = font_data_table_.insert(key, nullptr).stored_value;
if (!it->value)
it->value = CreateFontData(font_description, font_selection_capabilities);
font_data = it->value;
}
font_cache_key_age.PrependOrMoveToFirst(key);
PruneOldestIfNeeded();
DCHECK_LE(font_data_table_.size(), kMaxCachedFontData);
// No release, because fontData is a reference to a RefPtr that is held in the
// font_data_table_.
return font_data;
}
void CSSFontFaceSource::PruneOldestIfNeeded() {
if (font_cache_key_age.size() > kMaxCachedFontData) {
DCHECK_EQ(font_cache_key_age.size() - 1, kMaxCachedFontData);
FontCacheKey& key = font_cache_key_age.back();
auto font_data_entry = font_data_table_.Take(key);
font_cache_key_age.pop_back();
DCHECK_EQ(font_cache_key_age.size(), kMaxCachedFontData);
if (font_data_entry && font_data_entry->GetCustomFontData())
font_data_entry->GetCustomFontData()->ClearFontFaceSource();
}
}
void CSSFontFaceSource::PruneTable() {
if (font_data_table_.IsEmpty())
return;
for (const auto& item : font_data_table_) {
SimpleFontData* font_data = item.value.get();
if (font_data && font_data->GetCustomFontData())
font_data->GetCustomFontData()->ClearFontFaceSource();
}
font_cache_key_age.clear();
font_data_table_.clear();
}
} // namespace blink