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/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at https://mozilla.org/MPL/2.0/. */
#ifndef __FontVisibilityProvider_h__
#define __FontVisibilityProvider_h__
#include <stdint.h>
#include "mozilla/Maybe.h"
#include "nsICookieJarSettings.h"
class nsPresContext;
class gfxFontFamily;
class gfxUserFontEntry;
enum class FontVisibility : uint8_t;
namespace mozilla {
enum class RFPTarget : uint64_t;
namespace dom {
class OffscreenCanvasRenderingContext2D;
class Document;
} // namespace dom
namespace fontlist {
struct Family;
}
} // namespace mozilla
// We need this class to provide the font visibility information.
// Offscreen canvases can load fonts but don't have a presContext.
// With this class, we provide a way to get the font visibility
// for offscreen canvases and everything else. If we ever want
// to change or add more font visibility checks, we can do it here
// instead of changing the code in multiple files (at the time of
// writing this comment, around ~30 files).
class FontVisibilityProvider {
public:
virtual FontVisibility GetFontVisibility() const = 0;
virtual bool ShouldResistFingerprinting(mozilla::RFPTarget aTarget) const = 0;
virtual void ReportBlockedFontFamily(const nsCString& aMsg) const = 0;
virtual bool IsChrome() const = 0;
virtual bool IsPrivateBrowsing() const = 0;
virtual nsICookieJarSettings* GetCookieJarSettings() const = 0;
virtual mozilla::Maybe<FontVisibility> MaybeInheritFontVisibility() const = 0;
virtual void UserFontSetUpdated(gfxUserFontEntry* aUpdatedFont = nullptr) = 0;
void ReportBlockedFontFamily(const gfxFontFamily& aFamily) const;
void ReportBlockedFontFamily(const mozilla::fontlist::Family& aFamily) const;
void FormatBlockedFontFamilyMessage(nsCString& aMsg, const nsCString& aFamily,
FontVisibility aVisibility) const;
FontVisibility ComputeFontVisibility() const;
#define FONT_VISIBILITY_PROVIDER_IMPL \
FontVisibility GetFontVisibility() const override; \
bool ShouldResistFingerprinting(mozilla::RFPTarget aTarget) const override; \
void ReportBlockedFontFamily(const nsCString& aMsg) const override; \
bool IsChrome() const override; \
bool IsPrivateBrowsing() const override; \
nsICookieJarSettings* GetCookieJarSettings() const override; \
mozilla::Maybe<FontVisibility> MaybeInheritFontVisibility() const override; \
void UserFontSetUpdated(gfxUserFontEntry* aUpdatedFont = nullptr) override; \
using FontVisibilityProvider::ReportBlockedFontFamily;
};
#endif // __FontVisibilityProvider_h__
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