JAVA调用流程如下
FontDesignMetrics.charWidth(char) line: 441
FontDesignMetrics.getLatinCharWidth(char) line: 425
FontDesignMetrics.handleCharWidth(int) line: 416
FileFontStrike.getCodePointAdvance(int) line: 732
FileFontStrike.getGlyphAdvance(int) line: 613
FileFontStrike.getGlyphAdvance(int, boolean) line: 711
TrueTypeFont(FileFont).getGlyphAdvance(long, int) line: 190
FreetypeFontScaler.getGlyphAdvance(long, int) line: 88
之后是本地函数getGlyphAdvanceNative()
getGlyphAdvanceNative
GlyphInfo.advanceX
