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

   1 /*
   2  * Copyright (C) 2007, 2008 Apple Inc. All rights reserved.
   3  *
   4  * Redistribution and use in source and binary forms, with or without
   5  * modification, are permitted provided that the following conditions
   6  * are met:
   7  * 1. Redistributions of source code must retain the above copyright
   8  *    notice, this list of conditions and the following disclaimer.
   9  * 2. Redistributions in binary form must reproduce the above copyright
  10  *    notice, this list of conditions and the following disclaimer in the
  11  *    documentation and/or other materials provided with the distribution.
  12  *
  13  * THIS SOFTWARE IS PROVIDED BY APPLE COMPUTER, INC. ``AS IS'' AND ANY
  14  * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  15  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
  16  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL APPLE COMPUTER, INC. OR
  17  * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
  18  * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
  19  * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
  20  * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
  21  * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  22  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  23  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  24  */
  25
  26 #ifndef FontResource_h
  27 #define FontResource_h
  28
  29 #include "core/fetch/ResourceClient.h"
  30 #include "core/fetch/ResourcePtr.h"
  31 #include "platform/Timer.h"
  32 #include "platform/fonts/FontOrientation.h"
  33 #include "wtf/OwnPtr.h"
  34
  35 namespace blink {
  36
  37 class FetchRequest;
  38 class ResourceFetcher;
  39 class FontPlatformData;
  40 class FontCustomPlatformData;
  41
  42 class FontResource final : public Resource {
  43 public:
  44     typedef ResourceClient ClientType;
  45
  46     static ResourcePtr<FontResource> fetch(FetchRequest&, ResourceFetcher*);
  47     ~FontResource() override;
  48
  49     void load(ResourceFetcher*, const ResourceLoaderOptions&) override;
  50
  51     void didAddClient(ResourceClient*) override;
  52
  53     void allClientsRemoved() override;
  54     void beginLoadIfNeeded(ResourceFetcher* dl);
  55     bool stillNeedsLoad() const override { return m_state != LoadInitiated; }
  56     bool exceedsFontLoadWaitLimit() const { return m_exceedsFontLoadWaitLimit; }
  57
  58     bool loadScheduled() const { return m_state != Unloaded; }
  59     void didScheduleLoad();
  60     void didUnscheduleLoad();
  61
  62     void setCORSFailed() override { m_corsFailed = true; }
  63     bool isCORSFailed() const { return m_corsFailed; }
  64     String otsParsingMessage() const { return m_otsParsingMessage; }
  65
  66     bool ensureCustomFontData();
  67     FontPlatformData platformDataFromCustomData(float size, bool bold, bool italic, FontOrientation = FontOrientation::Horizontal);
  68
  69 protected:
  70     bool isSafeToUnlock() const override;
  71
  72 private:
  73     class FontResourceFactory : public ResourceFactory {
  74     public:
  75         FontResourceFactory()
  76             : ResourceFactory(Resource::Font) { }
  77
  78         Resource* create(const ResourceRequest& request, const String& charset) const override
  79         {
  80             return new FontResource(request);
  81         }
  82     };
  83     FontResource(const ResourceRequest&);
  84
  85     void checkNotify() override;
  86     void fontLoadWaitLimitCallback(Timer<FontResource>*);
  87
  88     enum State { Unloaded, LoadScheduled, LoadInitiated };
  89
  90     OwnPtr<FontCustomPlatformData> m_fontData;
  91     String m_otsParsingMessage;
  92     State m_state;
  93     bool m_exceedsFontLoadWaitLimit;
  94     bool m_corsFailed;
  95     Timer<FontResource> m_fontLoadWaitLimitTimer;
  96
  97     friend class MemoryCache;
  98 };
  99
 100 DEFINE_RESOURCE_TYPE_CASTS(Font);
 101
 102 class FontResourceClient : public ResourceClient {
 103 public:
 104     ~FontResourceClient() override {}
 105     static ResourceClientType expectedType() { return FontType; }
 106     ResourceClientType resourceClientType() const final { return expectedType(); }
 107     virtual void fontLoaded(FontResource*) {}
 108     virtual void didStartFontLoad(FontResource*) {}
 109     virtual void fontLoadWaitLimitExceeded(FontResource*) {}
 110 };
 111
 112 }
 113
 114 #endif