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quartz: Work around bad glyph extents returned by CoreGraphics for empty glyphs in Al Bayan font

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This resolves the problem by checking for the crazy glyph bbox result from
CoreGraphics, and replacing it with an empty rect.

From https://bugzilla.mozilla.org/show_bug.cgi?id=534260
This commit is contained in:
Jonathan Kew 2010-05-07 10:16:32 -04:00 • committed by Jeff Muizelaar
parent c5d9643417
commit 0068d9b5cd
1 changed files with 10 additions and 0 deletions
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10
src/cairo-quartz-font.c
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@ -420,6 +420,16 @@ _cairo_quartz_init_glyph_metrics (cairo_quartz_scaled_font_t *font,
!CGFontGetGlyphBBoxesPtr (font_face->cgFont, &glyph, 1, &bbox))
goto FAIL;
/* broken fonts like Al Bayan return incorrect bounds for some null characters,
see https://bugzilla.mozilla.org/show_bug.cgi?id=534260 */
if (unlikely (bbox.origin.x == -32767 &&
bbox.origin.y == -32767 &&
bbox.size.width == 65534 &&
bbox.size.height == 65534)) {
bbox.origin.x = bbox.origin.y = 0;
bbox.size.width = bbox.size.height = 0;
}
status = _cairo_matrix_compute_basis_scale_factors (&font->base.scale,
&xscale, &yscale, 1);
if (status)