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LibGfx/OpenType: Survive simple glyphs with 0 contours

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These are valid per spec, and do sometimes occur in practice, e.g.
in embedded fonts in 0000550.pdf and 0000246.pdf in 0000.zip in the
PDFA test set.
This commit is contained in:
Nico Weber 2024-01-03 20:42:45 -05:00 • committed by Alexander Kalenik
parent 486c562c7e
commit fa24fbf120
1 changed files with 3 additions and 1 deletions
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4
Userland/Libraries/LibGfx/Font/OpenType/Glyf.cpp
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@ -246,7 +246,9 @@ ReadonlyBytes Glyf::Glyph::program() const
void Glyf::Glyph::append_path_impl(Gfx::Path& path, Gfx::AffineTransform const& transform) const void Glyf::Glyph::append_path_impl(Gfx::Path& path, Gfx::AffineTransform const& transform) const
{ {
// Get offset for flags, x, and y. // Get offset for flags, x, and y.
u16 num_points = be_u16(m_slice.offset((m_num_contours - 1) * 2)) + 1; u16 num_points = 0;
if (m_num_contours > 0)
num_points = be_u16(m_slice.offset((m_num_contours - 1) * 2)) + 1;
u16 num_instructions = be_u16(m_slice.offset(m_num_contours * 2)); u16 num_instructions = be_u16(m_slice.offset(m_num_contours * 2));
u32 flags_offset = m_num_contours * 2 + 2 + num_instructions; u32 flags_offset = m_num_contours * 2 + 2 + num_instructions;
u32 x_offset = 0; u32 x_offset = 0;