third_party/WebKit/Source/core/fetch/FontResource.h

/*
 * Copyright (C) 2007, 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
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 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

#ifndef FontResource_h
#define FontResource_h

#include "core/fetch/Resource.h"
#include "core/fetch/ResourceClient.h"
#include "platform/Timer.h"
#include "platform/fonts/FontOrientation.h"
#include "platform/heap/Handle.h"
#include "wtf/OwnPtr.h"

namespace blink {

class FetchRequest;
class ResourceFetcher;
class FontPlatformData;
class FontCustomPlatformData;
class FontResourceClient;

class FontResource final : public Resource {
public:
    using ClientType = FontResourceClient;

    static FontResource* fetch(FetchRequest&, ResourceFetcher*);
    ~FontResource() override;

    void didAddClient(ResourceClient*) override;

    void setRevalidatingRequest(const ResourceRequest&) override;

    void allClientsAndObserversRemoved() override;
    void startLoadLimitTimersIfNeeded();

    void setCORSFailed() override { m_corsFailed = true; }
    bool isCORSFailed() const { return m_corsFailed; }
    String otsParsingMessage() const { return m_otsParsingMessage; }

    bool ensureCustomFontData();
    FontPlatformData platformDataFromCustomData(float size, bool bold, bool italic, FontOrientation = FontOrientation::Horizontal);

protected:
    bool isSafeToUnlock() const override;

private:
    class FontResourceFactory : public ResourceFactory {
    public:
        FontResourceFactory()
            : ResourceFactory(Resource::Font) { }

        Resource* create(const ResourceRequest& request, const ResourceLoaderOptions& options, const String& charset) const override
        {
            return new FontResource(request, options);
        }
    };
    FontResource(const ResourceRequest&, const ResourceLoaderOptions&);

    void checkNotify() override;
    void fontLoadShortLimitCallback(Timer<FontResource>*);
    void fontLoadLongLimitCallback(Timer<FontResource>*);

    enum LoadLimitState { UnderLimit, ShortLimitExceeded, LongLimitExceeded };

    OwnPtr<FontCustomPlatformData> m_fontData;
    String m_otsParsingMessage;
    LoadLimitState m_loadLimitState;
    bool m_corsFailed;
    Timer<FontResource> m_fontLoadShortLimitTimer;
    Timer<FontResource> m_fontLoadLongLimitTimer;

    friend class MemoryCache;
};

DEFINE_RESOURCE_TYPE_CASTS(Font);

class FontResourceClient : public GarbageCollectedMixin, public ResourceClient {
public:
    ~FontResourceClient() override {}
    static bool isExpectedType(ResourceClient* client) { return client->getResourceClientType() == FontType; }
    ResourceClientType getResourceClientType() const final { return FontType; }
    virtual void fontLoadShortLimitExceeded(FontResource*) {}
    virtual void fontLoadLongLimitExceeded(FontResource*) {}

    DEFINE_INLINE_VIRTUAL_TRACE() {}
};

} // namespace blink

#endif