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| 1 /* | |
| 2 * Copyright (c) 2010 Google 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 are | |
| 6 * met: | |
| 7 * | |
| 8 * * Redistributions of source code must retain the above copyright | |
| 9 * notice, this list of conditions and the following disclaimer. | |
| 10 * * Redistributions in binary form must reproduce the above | |
| 11 * copyright notice, this list of conditions and the following disclaimer | |
| 12 * in the documentation and/or other materials provided with the | |
| 13 * distribution. | |
| 14 * * Neither the name of Google Inc. nor the names of its | |
| 15 * contributors may be used to endorse or promote products derived from | |
| 16 * this software without specific prior written permission. | |
| 17 * | |
| 18 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS | |
| 19 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT | |
| 20 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR | |
| 21 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT | |
| 22 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, | |
| 23 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT | |
| 24 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, | |
| 25 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY | |
| 26 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT | |
| 27 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE | |
| 28 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. | |
| 29 */ | |
| 30 | |
| 31 #ifndef MemoryActivatedFont_h | |
| 32 #define MemoryActivatedFont_h | |
| 33 | |
| 34 #import <wtf/RefCounted.h> | |
| 35 #import <wtf/RetainPtr.h> | |
| 36 #import <wtf/text/WTFString.h> | |
| 37 | |
| 38 typedef struct CGFont* CGFontRef; | |
| 39 | |
| 40 namespace blink { | |
| 41 | |
| 42 // MemoryActivatedFont encapsulates a font loaded from another process and | |
| 43 // activated from memory. | |
| 44 // | |
| 45 // Responsibilities: | |
| 46 // * Holder for the CGFontRef & ATSFontRef belonging to the activated font. | |
| 47 // * Responsible for unloading the font container when done. | |
| 48 // | |
| 49 // Memory Management: | |
| 50 // The class is reference counted, with each instance of FontPlatformData that | |
| 51 // uses this class holding a reference to it. | |
| 52 // Entries are kept track of internally in a hash to allow quick lookup | |
| 53 // of existing instances for reuse: | |
| 54 // - fontCacheBySrcFontContainerRef() - key is the ATSFontContainerRef | |
| 55 // corresponding to the *original in-process NSFont* whose loading was blocked | |
| 56 // by the sandbox. | |
| 57 // This is needed to allow lookup of a pre-existing MemoryActivatedFont when | |
| 58 // creating a new FontPlatformData object. | |
| 59 // | |
| 60 // Assumptions: | |
| 61 // This code assumes that an ATSFontRef is a unique identifier tied to an | |
| 62 // activated font. i.e. After we activate a font, its ATSFontRef doesn't | |
| 63 // change. | |
| 64 // It also assumes that the ATSFoncontainerRef for two in-memory NSFonts that | |
| 65 // correspond to the same on-disk font file are always the same and don't change | |
| 66 // with time. | |
| 67 // | |
| 68 // Flushing caches: | |
| 69 // When the system notifies us of a system font cache flush, all FontDataCache | |
| 70 // objects are destroyed. This should in turn dereference all | |
| 71 // MemoryActivatedFonts and thus unload all in-memory fonts. | |
| 72 class MemoryActivatedFont : public RefCounted<MemoryActivatedFont> { | |
| 73 public: | |
| 74 // Use to create a new object, see docs on constructor below. | |
| 75 static PassRefPtr<MemoryActivatedFont> create(uint32_t fontID, NSFont*, CGFo
ntRef); | |
| 76 ~MemoryActivatedFont(); | |
| 77 | |
| 78 // Get cached CGFontRef corresponding to the in-memory font. | |
| 79 CGFontRef cgFont() { return m_cgFont.get(); } | |
| 80 | |
| 81 private: | |
| 82 // srcFontRef - ATSFontRef belonging to the NSFont object that failed to | |
| 83 // load in-process. | |
| 84 // container - a font container corresponding to an identical font that | |
| 85 // we loaded cross-process. | |
| 86 MemoryActivatedFont(uint32_t fontID, NSFont*, CGFontRef); | |
| 87 | |
| 88 WTF::RetainPtr<CGFontRef> m_cgFont; | |
| 89 uint32_t m_fontID; | |
| 90 WTF::String m_inSandboxHashKey; | |
| 91 }; | |
| 92 | |
| 93 } // namespace blink | |
| 94 | |
| 95 #endif // MemoryActivatedFont_h | |
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Chromium Code Reviews
Issue 879533003:
Remove Mac native font type members from FontPlatformData (Closed)
Base URL: https://chromium.googlesource.com/chromium/blink.git@master