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Add note about zero-glyph clusters

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Behdad Esfahbod 2008-08-08 17:06:21 -04:00
parent 322c3ef7f9
commit 5227897b17
1 changed files with 3 additions and 0 deletions
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src/cairo.h
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@ -847,6 +847,9 @@ cairo_glyph_free (cairo_glyph_t *glyphs);
*
* For a cluster to be valid, both @num_bytes and @num_glyphs should
* be non-negative, and at least one should be non-zero.
* Note that clusters with zero glyphs are not as well supported as
* normal clusters. For example, PDF rendering applications typically
* ignore those clusters when PDF text is being selected.
*
* See cairo_show_text_glyphs() for how clusters are used in advanced
* text operations.