[Webkit-unassigned] [Bug 50999] Supports Unicode variation selector

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=50999





--- Comment #3 from Kenichi Ishibashi <bashi at google.com>  2010-12-16 21:36:01 PST ---
BTW, I uses wkGetGlyphsForCharacters() to obtain glyph ID of UVSes. It generally works well, but it sometimes causes crash, even if it seems that the patch passes valid arguments to it. The function is provided as a library function, so I can't investigate the cause. Here is a stack trace when it crashed:

Program received signal EXC_BAD_ACCESS, Could not access memory.
Reason: KERN_INVALID_ADDRESS at address: 0x000000011ddb0e2a
0x00007fff8462f1f6 in std::equal_range<TFormat14UVSTable::UnicodeValueRange const*, int> ()
(gdb) bt 30
#0  0x00007fff8462f1f6 in std::equal_range<TFormat14UVSTable::UnicodeValueRange const*, int> ()
#1  0x00007fff8462a30c in TFormat14UVSTable::Map ()
#2  0x00007fff8462ffc3 in TFormat12UTF16cmapTable::MapT<true> ()
#3  0x00007fff845f881f in TcmapUnicodeTable::Map ()
#4  0x00007fff845f7a2d in TSFNTFont::GetGlyphsPerCharacters ()
#5  0x00007fff845f7931 in FPFontGetGlyphsForUnichars ()
#6  0x00000001018d63e8 in WebCore::GlyphPage::glyphDataForCharacterWithUVS (this=0x1092c4600, character=8745, selector=65024) at /Users/bashi/webkit/fonts/WebCore/platform/graphics/mac/GlyphPageTreeNodeMac.cpp:183
#7  0x000000010187b673 in WebCore::Font::glyphDataForCharacterWithUVS (this=0x107479d48, character=8745, selector=65024) at /Users/bashi/webkit/fonts/WebCore/platform/graphics/FontFastPath.cpp:218
#8  0x0000000102195a69 in WebCore::WidthIterator::advance (this=0x7fff5fbfa310, offset=3, glyphBuffer=0x0) at /Users/bashi/webkit/fonts/WebCore/platform/graphics/WidthIterator.cpp:131
#9  0x000000010187a40c in WebCore::Font::floatWidthForSimpleText (this=0x107479d48, run=@0x7fff5fbfa450, glyphBuffer=0x0, fallbackFonts=0x0, glyphOverflow=0x0) at /Users/bashi/webkit/fonts/WebCore/platform/graphics/FontFastPath.cpp:439
#10 0x0000000101869e08 in WebCore::Font::floatWidth (this=0x107479d48, run=@0x7fff5fbfa450, fallbackFonts=0x0, glyphOverflow=0x0) at /Users/bashi/webkit/fonts/WebCore/platform/graphics/Font.cpp:191
#11 0x000000010159a68f in WebCore::Font::width (this=0x107479d48, run=@0x7fff5fbfa450, fallbackFonts=0x0, glyphOverflow=0x0) at Font.h:98
#12 0x0000000101e63a90 in WebCore::textWidth (text=0x107496728, from=12, len=3, font=@0x107479d48, xPos=230, isFixedPitch=false, collapseWhiteSpace=true) at /Users/bashi/webkit/fonts/WebCore/rendering/RenderBlockLineLayout.cpp:1383
#13 0x0000000101e67204 in WebCore::RenderBlock::findNextLineBreak (this=0x107497a38, resolver=@0x7fff5fbfaa00, firstLine=true, isLineEmpty=@0x7fff5fbfadf5, previousLineBrokeCleanly=@0x7fff5fbfadf9, hyphenated=@0x7fff5fbfadf3, clear=0x7fff5fbfad98, lastFloatFromPreviousLine=0x0) at /Users/bashi/webkit/fonts/WebCore/rendering/RenderBlockLineLayout.cpp:1877
#14 0x0000000101e6aea5 in WebCore::RenderBlock::layoutInlineChildren (this=0x107497a38, relayoutChildren=false, repaintLogicalTop=@0x7fff5fbfb19c, repaintLogicalBottom=@0x7fff5fbfb198) at /Users/bashi/webkit/fonts/WebCore/rendering/RenderBlockLineLayout.cpp:667
#15 0x0000000101e4b4f0 in WebCore::RenderBlock::layoutBlock (this=0x107497a38, relayoutChildren=false, pageLogicalHeight=0) at /Users/bashi/webkit/fonts/WebCore/rendering/RenderBlock.cpp:1206
(snip)

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