| /* |
| * Copyright (c) 2010 Google 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: |
| * |
| * * Redistributions of source code must retain the above copyright |
| * notice, this list of conditions and the following disclaimer. |
| * * 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. |
| * * Neither the name of Google Inc. nor the names of its |
| * contributors may be used to endorse or promote products derived from |
| * this software without specific prior written permission. |
| * |
| * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS |
| * "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 THE COPYRIGHT |
| * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, |
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| * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
| */ |
| |
| #ifndef MemoryActivatedFont_h |
| #define MemoryActivatedFont_h |
| |
| #import <wtf/RefCounted.h> |
| #import <wtf/RetainPtr.h> |
| #import <wtf/text/WTFString.h> |
| |
| typedef struct CGFont* CGFontRef; |
| |
| namespace WebCore { |
| |
| // MemoryActivatedFont encapsulates a font loaded from another process and |
| // activated from memory. |
| // |
| // Responsibilities: |
| // * Holder for the CGFontRef & ATSFontRef belonging to the activated font. |
| // * Responsible for unloading the font container when done. |
| // |
| // Memory Management: |
| // The class is reference counted, with each instance of FontPlatformData that |
| // uses this class holding a reference to it. |
| // Entries are kept track of internally in a hash to allow quick lookup |
| // of existing instances for reuse: |
| // - fontCacheBySrcFontContainerRef() - key is the ATSFontContainerRef |
| // corresponding to the *original in-process NSFont* whose loading was blocked |
| // by the sandbox. |
| // This is needed to allow lookup of a pre-existing MemoryActivatedFont when |
| // creating a new FontPlatformData object. |
| // |
| // Assumptions: |
| // This code assumes that an ATSFontRef is a unique identifier tied to an |
| // activated font. i.e. After we activate a font, its ATSFontRef doesn't |
| // change. |
| // It also assumes that the ATSFoncontainerRef for two in-memory NSFonts that |
| // correspond to the same on-disk font file are always the same and don't change |
| // with time. |
| // |
| // Flushing caches: |
| // When the system notifies us of a system font cache flush, all FontDataCache |
| // objects are destroyed. This should in turn dereference all |
| // MemoryActivatedFonts and thus unload all in-memory fonts. |
| class MemoryActivatedFont : public RefCounted<MemoryActivatedFont> { |
| public: |
| // Use to create a new object, see docs on constructor below. |
| static PassRefPtr<MemoryActivatedFont> create(uint32_t fontID, NSFont*, CGFontRef); |
| ~MemoryActivatedFont(); |
| |
| // Get cached CGFontRef corresponding to the in-memory font. |
| CGFontRef cgFont() { return m_cgFont.get(); } |
| |
| private: |
| // srcFontRef - ATSFontRef belonging to the NSFont object that failed to |
| // load in-process. |
| // container - a font container corresponding to an identical font that |
| // we loaded cross-process. |
| MemoryActivatedFont(uint32_t fontID, NSFont*, CGFontRef); |
| |
| WTF::RetainPtr<CGFontRef> m_cgFont; |
| uint32_t m_fontID; |
| WTF::String m_inSandboxHashKey; |
| }; |
| |
| } // namespace WebCore |
| |
| #endif // MemoryActivatedFont_h |