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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:
*
* 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. AND ITS 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 APPLE INC. OR ITS 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.
*/
#ifndef THIRD_PARTY_BLINK_RENDERER_CORE_CSS_FONT_FACE_SET_DOCUMENT_H_
#define THIRD_PARTY_BLINK_RENDERER_CORE_CSS_FONT_FACE_SET_DOCUMENT_H_
#include "third_party/blink/renderer/bindings/core/v8/iterable.h"
#include "third_party/blink/renderer/bindings/core/v8/script_promise.h"
#include "third_party/blink/renderer/core/css/css_font_selector.h"
#include "third_party/blink/renderer/core/css/font_face.h"
#include "third_party/blink/renderer/core/css/font_face_set.h"
#include "third_party/blink/renderer/core/css/style_engine.h"
#include "third_party/blink/renderer/core/dom/document.h"
#include "third_party/blink/renderer/core/dom/events/event_listener.h"
#include "third_party/blink/renderer/core/dom/events/event_target.h"
#include "third_party/blink/renderer/platform/heap/handle.h"
#include "third_party/blink/renderer/platform/wtf/allocator/allocator.h"
namespace blink {
class Font;
class CORE_EXPORT FontFaceSetDocument final : public FontFaceSet,
public Supplement<Document> {
public:
static const char kSupplementName[];
explicit FontFaceSetDocument(Document&);
FontFaceSetDocument(const FontFaceSetDocument&) = delete;
FontFaceSetDocument& operator=(const FontFaceSetDocument&) = delete;
~FontFaceSetDocument() override;
ScriptPromise ready(ScriptState*) override;
AtomicString status() const override;
void DidLayout();
void BeginFontLoading(FontFace*);
// FontFace::LoadFontCallback
void NotifyLoaded(FontFace*) override;
void NotifyError(FontFace*) override;
// After flipping the flag to true, all 'font-display: auto' fonts that
// haven't finished loading will enter the failure period immediately (except
// for those already in the memory cache), so that they don't cause a bad
// Largest Contentful Paint (https://wicg.github.io/largest-contentful-paint/)
bool HasReachedLCPLimit() const { return has_reached_lcp_limit_; }
void LCPLimitReached(TimerBase*);
size_t ApproximateBlankCharacterCount() const;
static FontFaceSetDocument* From(Document&);
static void DidLayout(Document&);
static size_t ApproximateBlankCharacterCount(Document&);
void Trace(Visitor*) const override;
protected:
bool InActiveContext() const override;
FontSelector* GetFontSelector() const override {
DCHECK(IsMainThread());
return GetDocument()->GetStyleEngine().GetFontSelector();
}
bool ResolveFontStyle(const String&, Font&) override;
private:
Document* GetDocument() const;
void FireDoneEventIfPossible() override;
const HeapLinkedHashSet<Member<FontFace>>& CSSConnectedFontFaceList()
const override;
void StartLCPLimitTimerIfNeeded();
void AlignTimeoutWithLCPGoal(FontFace* font_face);
class FontLoadHistogram {
DISALLOW_NEW();
public:
enum Status { kNoWebFonts, kHadBlankText, kDidNotHaveBlankText, kReported };
FontLoadHistogram() : status_(kNoWebFonts) {}
void UpdateStatus(FontFace*);
void Record();
private:
Status status_;
};
FontLoadHistogram font_load_histogram_;
class FontDisplayAutoAlignHistogram {
DISALLOW_NEW();
public:
void SetHasFontDisplayAuto() { has_font_display_auto_ = true; }
void CountAffected() { ++affected_count_; }
void Record();
private:
unsigned affected_count_ = 0;
bool has_font_display_auto_ = false;
bool reported_ = false;
};
FontDisplayAutoAlignHistogram font_display_auto_align_histogram_;
HeapTaskRunnerTimer<FontFaceSetDocument> lcp_limit_timer_;
bool has_reached_lcp_limit_ = false;
};
} // namespace blink
#endif // THIRD_PARTY_BLINK_RENDERER_CORE_CSS_FONT_FACE_SET_DOCUMENT_H_
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