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// Copyright 2019 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef THIRD_PARTY_BLINK_RENDERER_PLATFORM_FONTS_FONT_MATCHING_METRICS_H_
#define THIRD_PARTY_BLINK_RENDERER_PLATFORM_FONTS_FONT_MATCHING_METRICS_H_
#include "services/metrics/public/cpp/ukm_source_id.h"
#include "third_party/blink/renderer/platform/platform_export.h"
#include "third_party/blink/renderer/platform/wtf/hash_set.h"
#include "third_party/blink/renderer/platform/wtf/text/atomic_string.h"
#include "third_party/blink/renderer/platform/wtf/text/atomic_string_hash.h"
namespace ukm {
class UkmRecorder;
} // namespace ukm
namespace blink {
// Tracks and reports UKM metrics of the number of attempted font family match
// attempts (both successful and not successful) by the current frame.
//
// Only the number of successful / not successful font family match attempts are
// reported to UKM. The class de-dupes attempts to match the same font family
// name such that they are counted as one attempt.
class PLATFORM_EXPORT FontMatchingMetrics {
public:
FontMatchingMetrics(bool top_level,
ukm::UkmRecorder* ukm_recorder,
ukm::SourceId source_id)
: top_level_(top_level),
ukm_recorder_(ukm_recorder),
source_id_(source_id) {}
// Called when a page attempts to match a font family, and the font family is
// available.
void ReportSuccessfulFontFamilyMatch(const AtomicString& font_family_name);
// Called when a page attempts to match a font family, and the font family is
// not available.
void ReportFailedFontFamilyMatch(const AtomicString& font_family_name);
// Called when a page attempts to match a system font family.
void ReportSystemFontFamily(const AtomicString& font_family_name);
// Called when a page attempts to match a web font family.
void ReportWebFontFamily(const AtomicString& font_family_name);
// Publishes the number of font family matches attempted (both successful and
// otherwise) to UKM. Called at page unload.
void PublishUkmMetrics();
private:
// Font family names successfully matched.
HashSet<AtomicString> successful_font_families_;
// Font family names that weren't successfully matched.
HashSet<AtomicString> failed_font_families_;
// System font families the page attempted to match.
HashSet<AtomicString> system_font_families_;
// Web font families the page attempted to match.
HashSet<AtomicString> web_font_families_;
// True if this FontMatchingMetrics instance is for a top-level frame, false
// otherwise.
const bool top_level_ = false;
ukm::UkmRecorder* const ukm_recorder_;
const ukm::SourceId source_id_;
};
} // namespace blink
#endif // THIRD_PARTY_BLINK_RENDERER_PLATFORM_FONTS_FONT_MATCHING_METRICS_H_
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