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/*
* Copyright (C) 2003, 2006, 2008 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.
*/
#ifndef THIRD_PARTY_BLINK_RENDERER_PLATFORM_FONTS_FONT_FAMILY_H_
#define THIRD_PARTY_BLINK_RENDERER_PLATFORM_FONTS_FONT_FAMILY_H_
#include "base/memory/scoped_refptr.h"
#include "third_party/blink/renderer/platform/platform_export.h"
#include "third_party/blink/renderer/platform/wtf/text/atomic_string.h"
#include "third_party/blink/renderer/platform/wtf/thread_safe_ref_counted.h"
namespace blink {
class SharedFontFamily;
class PLATFORM_EXPORT FontFamily {
DISALLOW_NEW();
public:
// https://drafts.csswg.org/css-fonts/#font-family-prop
enum class Type : uint8_t { kFamilyName, kGenericFamily };
FontFamily(const AtomicString& family_name,
Type family_type,
scoped_refptr<SharedFontFamily> next = nullptr)
: family_name_(family_name),
next_(std::move(next)),
family_type_(family_type) {}
FontFamily() = default;
~FontFamily();
// Return this font family's name. Note that it is never quoted nor escaped.
// For web-exposed serialization, please rely instead on the functions
// ComputedStyleUtils::ValueForFontFamily(const FontFamily&) and
// CSSValue::CssText() in order to match formatting rules from the CSSOM
// specification.
const AtomicString& FamilyName() const { return family_name_; }
bool FamilyIsGeneric() const { return family_type_ == Type::kGenericFamily; }
const FontFamily* Next() const;
scoped_refptr<SharedFontFamily> ReleaseNext();
bool IsPrewarmed() const { return is_prewarmed_; }
void SetIsPrewarmed() const { is_prewarmed_ = true; }
// Returns this font family's name followed by all subsequent linked
// families separated ", " (comma and space). Font family names are never
// quoted nor escaped. For web-exposed serialization, please rely instead on
// the functions ComputedStyleUtils::ValueForFontFamily(const FontFamily&) and
// CSSValue::CssText() in order to match formatting rules from the CSSOM
// specification.
String ToString() const;
// Return kGenericFamily if family_name is equal to one of the supported
// <generic-family> keyword from the CSS fonts module spec and kFamilyName
// otherwise.
static Type InferredTypeFor(const AtomicString& family_name);
private:
AtomicString family_name_;
scoped_refptr<SharedFontFamily> next_;
Type family_type_ = Type::kFamilyName;
mutable bool is_prewarmed_ = false;
};
class PLATFORM_EXPORT SharedFontFamily : public FontFamily,
public RefCounted<SharedFontFamily> {
USING_FAST_MALLOC(SharedFontFamily);
public:
SharedFontFamily(const SharedFontFamily&) = delete;
SharedFontFamily& operator=(const SharedFontFamily&) = delete;
static scoped_refptr<SharedFontFamily> Create(
const AtomicString& family_name,
Type family_type,
scoped_refptr<SharedFontFamily> next = nullptr) {
return base::AdoptRef(
new SharedFontFamily(family_name, family_type, std::move(next)));
}
private:
SharedFontFamily(const AtomicString& family_name,
Type family_type,
scoped_refptr<SharedFontFamily> next)
: FontFamily(family_name, family_type, std::move(next)) {}
};
PLATFORM_EXPORT bool operator==(const FontFamily&, const FontFamily&);
inline bool operator!=(const FontFamily& a, const FontFamily& b) {
return !(a == b);
}
inline FontFamily::~FontFamily() {
scoped_refptr<SharedFontFamily> reaper = std::move(next_);
while (reaper && reaper->HasOneRef()) {
// implicitly protects reaper->next, then derefs reaper
reaper = reaper->ReleaseNext();
}
}
inline const FontFamily* FontFamily::Next() const {
return next_.get();
}
inline scoped_refptr<SharedFontFamily> FontFamily::ReleaseNext() {
return std::move(next_);
}
} // namespace blink
#endif // THIRD_PARTY_BLINK_RENDERER_PLATFORM_FONTS_FONT_FAMILY_H_
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