Source/core/platform/graphics/mac/MemoryActivatedFont.h - Issue 99103006: Moving GraphicsContext and dependencies from core to platform.

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Issue 99103006: Moving GraphicsContext and dependencies from core to platform. (Closed) Base URL: svn://svn.chromium.org/blink/trunk

Patch Set: Final patch - fixes Android Created 7 years ago

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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 WebCore {

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 WebCore

94

95 #endif // MemoryActivatedFont_h

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