Make text visible when font loading takes longer than 3 seconds

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
@@ skipping 10 matching lines @@
  * 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 FontResource_h
 #define FontResource_h
 
 #include "core/fetch/ResourceClient.h"
 #include "core/fetch/ResourcePtr.h"
+#include "platform/Timer.h"
 #include "platform/fonts/FontOrientation.h"
 #include "platform/fonts/FontWidthVariant.h"
 #include "wtf/OwnPtr.h"
 
 namespace WebCore {
 
 class ResourceFetcher;
 class FontPlatformData;
 class SVGDocument;
 class SVGFontElement;
 class FontCustomPlatformData;
 
 class FontResource FINAL : public Resource {
 public:
     typedef ResourceClient ClientType;
 
     FontResource(const ResourceRequest&);
     virtual ~FontResource();
 
     virtual void load(ResourceFetcher*, const ResourceLoaderOptions&) OVERRIDE;
 
     virtual void didAddClient(ResourceClient*) OVERRIDE;
 
     virtual void allClientsRemoved() OVERRIDE;
     void beginLoadIfNeeded(ResourceFetcher* dl);
     virtual bool stillNeedsLoad() const OVERRIDE { return !m_loadInitiated; }
+    bool exceedsFontLoadWaitLimit() const { return m_exceedsFontLoadWaitLimit; }
 
     bool ensureCustomFontData();
     FontPlatformData platformDataFromCustomData(float size, bool bold, bool italic, FontOrientation = Horizontal, FontWidthVariant = RegularWidth);
 
 #if ENABLE(SVG_FONTS)
     bool ensureSVGFontData();
     SVGFontElement* getSVGFontById(const String&) const;
 #endif
 
 private:
     virtual void checkNotify() OVERRIDE;
+    void fontLoadWaitLimitCallback(Timer<FontResource>*);
+
     OwnPtr<FontCustomPlatformData> m_fontData;
     bool m_loadInitiated;
+    bool m_exceedsFontLoadWaitLimit;
+    Timer<FontResource> m_fontLoadWaitLimitTimer;
 
 #if ENABLE(SVG_FONTS)
     RefPtr<WebCore::SVGDocument> m_externalSVGDocument;
 #endif
 
     friend class MemoryCache;
 };
 
 DEFINE_RESOURCE_TYPE_CASTS(Font);
 
 class FontResourceClient : public ResourceClient {
 public:
     virtual ~FontResourceClient() { }
     static ResourceClientType expectedType() { return FontType; }
     virtual ResourceClientType resourceClientType() const OVERRIDE FINAL { return expectedType(); }
     virtual void fontLoaded(FontResource*) { }
     virtual void didStartFontLoad(FontResource*) { }
+    virtual void fontLoadWaitLimitExceeded(FontResource*) { }
 };
 
 }
 
 #endif