IDWriteFontFace::GetGlyphRunOutline method (dwrite.h)

Computes the outline of a run of glyphs by calling back to the outline sink interface.


HRESULT GetGlyphRunOutline(
                 FLOAT                     emSize,
  [in]           UINT16 const              *glyphIndices,
  [in, optional] FLOAT const               *glyphAdvances,
  [in, optional] DWRITE_GLYPH_OFFSET const *glyphOffsets,
                 UINT32                    glyphCount,
                 BOOL                      isSideways,
                 BOOL                      isRightToLeft,
                 IDWriteGeometrySink       *geometrySink




The logical size of the font in DIP units. A DIP ("device-independent pixel") equals 1/96 inch.

[in] glyphIndices

Type: const UINT16*

An array of glyph indices. The glyphs are in logical order and the advance direction depends on the isRightToLeft parameter. The array must be allocated and be able to contain the number of elements specified by glyphCount.

[in, optional] glyphAdvances

Type: const FLOAT*

An optional array of glyph advances in DIPs. The advance of a glyph is the amount to advance the position (in the direction of the baseline) after drawing the glyph. glyphAdvances contains the number of elements specified by glyphCount.

[in, optional] glyphOffsets


An optional array of glyph offsets, each of which specifies the offset along the baseline and offset perpendicular to the baseline of a glyph relative to the current pen position. glyphOffsets contains the number of elements specified by glyphCount.


Type: UINT32

The number of glyphs in the run.


Type: BOOL

If TRUE, the ascender of the glyph runs alongside the baseline. If FALSE, the glyph ascender runs perpendicular to the baseline. For example, an English alphabet on a vertical baseline would have isSideways set to FALSE.

A client can render a vertical run by setting isSideways to TRUE and rotating the resulting geometry 90 degrees to the right using a transform. The isSideways and isRightToLeft parameters cannot both be true.


Type: BOOL

The visual order of the glyphs. If this parameter is FALSE, then glyph advances are from left to right. If TRUE, the advance direction is right to left. By default, the advance direction is left to right.


Type: IDWriteGeometrySink*

A pointer to the interface that is called back to perform outline drawing operations.

Return value


If this method succeeds, it returns S_OK. Otherwise, it returns an HRESULT error code.


Minimum supported client Windows 7, Windows Vista with SP2 and Platform Update for Windows Vista [desktop apps | UWP apps]
Minimum supported server Windows Server 2008 R2, Windows Server 2008 with SP2 and Platform Update for Windows Server 2008 [desktop apps | UWP apps]
Target Platform Windows
Header dwrite.h
Library Dwrite.lib
DLL Dwrite.dll

See also