sorry, fixed, it's the bug of my program.
IDWriteTextAnalyzer::GetGlyphPlacements returns a smaller glyph advance compared to IDWriteFontFace::GetDesignGlyphMetrics for Color glyph
![](data:image/svg+xml, %3Csvg xmlns='http://www.w3.org/2000/svg' height='64' class='font-weight-bold' style='font: 600 30.11764705882353px "SegoeUI", Arial' width='64'%3E%3Ccircle fill='hsl(204.8, 55.00000000000001%, 29%)' cx='32' cy='32' r='32' /%3E%3Ctext x='50%25' y='55%25' dominant-baseline='middle' text-anchor='middle' fill='%23FFF' %3EZZ%3C/text%3E%3C/svg%3E)
z z
101
Reputation points
the emoji advance is smaller than it's display width
Windows development | Windows API - Win32
Answer accepted by question author