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[cairo] Protect against some invalid matrices

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hb-view --font-size 0,10 still fails with cairo error.
To be debugged separately.
This commit is contained in:
Behdad Esfahbod 2024-11-16 12:20:24 -07:00
parent d759ee5a8d
commit 392463267f
1 changed files with 6 additions and 2 deletions
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8
src/hb-cairo.cc
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@ -597,7 +597,9 @@ hb_cairo_render_glyph (cairo_scaled_font_t *scaled_font,
hb_position_t x_scale, y_scale;
hb_font_get_scale (font, &x_scale, &y_scale);
cairo_scale (cr, +1./x_scale, -1./y_scale);
cairo_scale (cr,
+1. / (x_scale ? x_scale : 1),
-1. / (y_scale ? y_scale : 1));
hb_font_draw_glyph (font, glyph, hb_cairo_draw_get_funcs (), cr);
@ -628,7 +630,9 @@ hb_cairo_render_color_glyph (cairo_scaled_font_t *scaled_font,
hb_color_t color = HB_COLOR (0, 0, 0, 255);
hb_position_t x_scale, y_scale;
hb_font_get_scale (font, &x_scale, &y_scale);
cairo_scale (cr, +1./x_scale, -1./y_scale);
cairo_scale (cr,
+1. / (x_scale ? x_scale : 1),
-1. / (y_scale ? y_scale : 1));
hb_cairo_context_t c;
c.scaled_font = scaled_font;