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/*
* Copyright (C) 2013 Google 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.
* * Neither the name of Google Inc. nor the names of its
* contributors may be used to endorse or promote products derived from
* this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "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 "third_party/blink/renderer/platform/fonts/font_data_cache.h"
#include "build/build_config.h"
#include "third_party/blink/renderer/platform/fonts/simple_font_data.h"
namespace blink {
namespace {
// The maximum number of strong references to retain via the LRU.
// This explicitly leaks fonts (and related objects) unless under extreme
// memory pressure where it will be cleared. DO NOT increase unnecessarily.
const wtf_size_t kMaxSize = 64;
} // namespace
const SimpleFontData* FontDataCache::Get(const FontPlatformData* platform_data,
bool subpixel_ascent_descent) {
if (!platform_data)
return nullptr;
// TODO: crbug.com/446376 - This should not happen, but we currently
// do not have a reproduction for the crash that an empty typeface()
// causes downstream from here.
if (!platform_data->Typeface()) {
DLOG(ERROR)
<< "Empty typeface() in FontPlatformData when accessing FontDataCache.";
return nullptr;
}
auto add_result = cache_.insert(platform_data, nullptr);
if (add_result.is_new_entry) {
add_result.stored_value->value = MakeGarbageCollected<SimpleFontData>(
platform_data, nullptr, subpixel_ascent_descent);
}
const SimpleFontData* result = add_result.stored_value->value;
// Update our LRU to keep a strong reference to `result`.
strong_reference_lru_.PrependOrMoveToFirst(result);
while (strong_reference_lru_.size() > kMaxSize) {
strong_reference_lru_.pop_back();
}
return result;
}
} // namespace blink
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