Home | History | Annotate | Download | only in fetch 
      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 "platform/fonts/FontWidthVariant.h"
     34 #include "wtf/OwnPtr.h"
     35 
     36 namespace blink {
     37 
     38 class Document;
     39 class ResourceFetcher;
     40 class FontPlatformData;
     41 class SVGFontElement;
     42 class FontCustomPlatformData;
     43 
     44 class FontResource FINAL : public Resource {
     45 public:
     46     typedef ResourceClient ClientType;
     47 
     48     FontResource(const ResourceRequest&);
     49     virtual ~FontResource();
     50     virtual void trace(Visitor*) OVERRIDE;
     51 
     52     virtual void load(ResourceFetcher*, const ResourceLoaderOptions&) OVERRIDE;
     53 
     54     virtual void didAddClient(ResourceClient*) OVERRIDE;
     55 
     56     virtual void allClientsRemoved() OVERRIDE;
     57     void beginLoadIfNeeded(ResourceFetcher* dl);
     58     virtual bool stillNeedsLoad() const OVERRIDE { return m_state != LoadInitiated; }
     59     bool exceedsFontLoadWaitLimit() const { return m_exceedsFontLoadWaitLimit; }
     60 
     61     bool loadScheduled() const { return m_state != Unloaded; }
     62     void didScheduleLoad();
     63     void didUnscheduleLoad();
     64 
     65     void setCORSFailed() { m_corsFailed = true; }
     66     bool isCORSFailed() const { return m_corsFailed; }
     67 
     68     bool ensureCustomFontData();
     69     FontPlatformData platformDataFromCustomData(float size, bool bold, bool italic, FontOrientation = Horizontal, FontWidthVariant = RegularWidth);
     70 
     71 #if ENABLE(SVG_FONTS)
     72     bool ensureSVGFontData();
     73     SVGFontElement* getSVGFontById(const String&) const;
     74 #endif
     75 
     76 protected:
     77     virtual bool isSafeToUnlock() const OVERRIDE;
     78 
     79 private:
     80     virtual void checkNotify() OVERRIDE;
     81     void fontLoadWaitLimitCallback(Timer<FontResource>*);
     82 
     83     enum State { Unloaded, LoadScheduled, LoadInitiated };
     84 
     85     OwnPtr<FontCustomPlatformData> m_fontData;
     86     State m_state;
     87     bool m_exceedsFontLoadWaitLimit;
     88     bool m_corsFailed;
     89     Timer<FontResource> m_fontLoadWaitLimitTimer;
     90 
     91 #if ENABLE(SVG_FONTS)
     92     RefPtrWillBeMember<Document> m_externalSVGDocument;
     93 #endif
     94 
     95     friend class MemoryCache;
     96 };
     97 
     98 DEFINE_RESOURCE_TYPE_CASTS(Font);
     99 
    100 class FontResourceClient : public ResourceClient {
    101 public:
    102     virtual ~FontResourceClient() { }
    103     static ResourceClientType expectedType() { return FontType; }
    104     virtual ResourceClientType resourceClientType() const OVERRIDE FINAL { return expectedType(); }
    105     virtual void fontLoaded(FontResource*) { }
    106     virtual void didStartFontLoad(FontResource*) { }
    107     virtual void fontLoadWaitLimitExceeded(FontResource*) { }
    108 };
    109 
    110 }
    111 
    112 #endif
    113