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[show_text_glyphs] Allow clusters with zero text

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As Adrian points out, PDF can handle it, and it doesn't harm allowing.
This commit is contained in:
Behdad Esfahbod 2008-06-29 15:00:10 -04:00
parent 686fa2600d
commit 17a5f10f53
1 changed files with 7 additions and 2 deletions
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9
src/cairo.c
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@ -3236,11 +3236,16 @@ cairo_show_text_glyphs (cairo_t *cr,
int cluster_bytes = clusters[i].num_bytes;
int cluster_glyphs = clusters[i].num_glyphs;
/* A cluster should cover at least one byte.
if (cluster_bytes < 0 || cluster_glyphs < 0)
goto BAD;
/* A cluster should cover at least one character or glyph.
* I can't see any use for a 0,0 cluster.
* I can't see an immediate use for a zero-text cluster
* right now either, but they don't harm.
* Zero-glyph clusters on the other hand are useful for
* things like U+200C ZERO WIDTH NON-JOINER */
if (cluster_bytes < 1 || cluster_glyphs < 0)
if (cluster_bytes == 0 && cluster_glyphs == 0)
goto BAD;
/* Since n_bytes and n_glyphs are unsigned, but the rest of