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* Copyright (c) 2010 Google Inc. All rights reserved.
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are
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* * Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* * Redistributions in binary form must reproduce the above
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* copyright notice, this list of conditions and the following disclaimer
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* in the documentation and/or other materials provided with the
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* * Neither the name of Google Inc. nor the names of its
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* contributors may be used to endorse or promote products derived from
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* this software without specific prior written permission.
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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#ifndef CrossProcessFontLoading_h
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#define CrossProcessFontLoading_h
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#import <wtf/RefCounted.h>
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#import <wtf/RetainPtr.h>
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#import <wtf/text/WTFString.h>
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typedef struct CGFont* CGFontRef;
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// MemoryActivatedFont encapsulates a font loaded from another process and
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// activated from memory.
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// * Holder for the CGFontRef & ATSFontRef belonging to the activated font.
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// * Responsible for unloading the font container when done.
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// The class is reference counted, with each instance of FontPlatformData that
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// uses this class holding a reference to it.
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// Entries are kept track of internally in a hash to allow quick lookup
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// of existing instances for reuse:
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// - fontCacheBySrcFontContainerRef() - key is the ATSFontContainerRef
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// corresponding to the *original in-process NSFont* whose loading was blocked
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// This is needed to allow lookup of a pre-existing MemoryActivatedFont when
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// creating a new FontPlatformData object.
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// This code assumes that an ATSFontRef is a unique identifier tied to an
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// activated font. i.e. After we activate a font, its ATSFontRef doesn't
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// It also assumes that the ATSFoncontainerRef for two in-memory NSFonts that
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// correspond to the same on-disk font file are always the same and don't change
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// When the system notifies us of a system font cache flush, all FontDataCache
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// objects are destroyed. This should in turn dereference all
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// MemoryActivatedFonts and thus unload all in-memory fonts.
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class MemoryActivatedFont : public RefCounted<MemoryActivatedFont> {
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// Use to create a new object, see docs on constructor below.
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static PassRefPtr<MemoryActivatedFont> create(uint32_t fontID, NSFont*, CGFontRef);
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~MemoryActivatedFont();
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// Get cached CGFontRef corresponding to the in-memory font.
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CGFontRef cgFont() { return m_cgFont.get(); }
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// srcFontRef - ATSFontRef belonging to the NSFont object that failed to
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// container - a font container corresponding to an identical font that
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// we loaded cross-process.
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MemoryActivatedFont(uint32_t fontID, NSFont*, CGFontRef);
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WTF::RetainPtr<CGFontRef> m_cgFont;
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WTF::String m_inSandboxHashKey;
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} // namespace WebCore
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#endif // CrossProcessFontLoading_h