| /* |
| * 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 (IsLocalNonBlocking()) { |
| // 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 |