cairoUserFontFaceSetRenderGlyphFunc {RGtk2} | R Documentation

## cairoUserFontFaceSetRenderGlyphFunc

### Description

Sets the glyph rendering function of a user-font. See `cairo_user_scaled_font_render_glyph_func_t` for details of how the callback works.

### Usage

    cairoUserFontFaceSetRenderGlyphFunc(font.face, render.glyph.func)

### Arguments

``font.face`` | [`CairoFontFace`] A user font face
``render.glyph.func`` | [cairo_user_scaled_font_render_glyph_func_t] The render_glyph callback, or `NULL`

### Details

The font-face should not be immutable or a `CAIRO_STATUS_USER_FONT_IMMUTABLE` error will occur. A user font-face is immutable as soon as a scaled-font is created from it.

The render_glyph callback is the only mandatory callback of a user-font. If the callback is `NULL` and a glyph is tried to be rendered using `font.face`, a `CAIRO_STATUS_USER_FONT_ERROR` will occur. Since 1.8

### Author(s)

Derived by RGtkGen from GTK+ documentation

[Package RGtk2 version 2.20.40 Index]