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LibGfx/OpenType: Read "glyf" table header using a C++ struct

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This commit is contained in:
Andreas Kling 2022-12-20 13:35:47 +01:00
parent 2185a98b36
commit abad197884
2 changed files with 15 additions and 15 deletions
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15
Userland/Libraries/LibGfx/Font/OpenType/Glyf.cpp
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@ -358,13 +358,14 @@ RefPtr<Gfx::Bitmap> Glyf::Glyph::rasterize_simple(i16 font_ascender, i16 font_de
Glyf::Glyph Glyf::glyph(u32 offset) const
{
VERIFY(m_slice.size() >= offset + (u32)Sizes::GlyphHeader);
i16 num_contours = be_i16(m_slice.offset_pointer(offset));
i16 xmin = be_i16(m_slice.offset_pointer(offset + (u32)Offsets::XMin));
i16 ymin = be_i16(m_slice.offset_pointer(offset + (u32)Offsets::YMin));
i16 xmax = be_i16(m_slice.offset_pointer(offset + (u32)Offsets::XMax));
i16 ymax = be_i16(m_slice.offset_pointer(offset + (u32)Offsets::YMax));
auto slice = ReadonlyBytes(m_slice.offset_pointer(offset + (u32)Sizes::GlyphHeader), m_slice.size() - offset - (u32)Sizes::GlyphHeader);
VERIFY(m_slice.size() >= offset + sizeof(GlyphHeader));
auto const& glyph_header = *bit_cast<GlyphHeader const*>(m_slice.offset_pointer(offset));
i16 num_contours = glyph_header.number_of_contours;
i16 xmin = glyph_header.x_min;
i16 ymin = glyph_header.y_min;
i16 xmax = glyph_header.x_max;
i16 ymax = glyph_header.y_max;
auto slice = m_slice.slice(offset + sizeof(GlyphHeader));
return Glyph(slice, xmin, ymin, xmax, ymax, num_contours);
}

15
Userland/Libraries/LibGfx/Font/OpenType/Glyf.h
View file

@ -148,14 +148,13 @@ public:
Glyph glyph(u32 offset) const;
private:
enum class Offsets {
XMin = 2,
YMin = 4,
XMax = 6,
YMax = 8,
};
enum class Sizes {
GlyphHeader = 10,
// https://learn.microsoft.com/en-us/typography/opentype/spec/glyf#glyph-headers
struct GlyphHeader {
BigEndian<i16> number_of_contours;
BigEndian<i16> x_min;
BigEndian<i16> y_min;
BigEndian<i16> x_max;
BigEndian<i16> y_max;
};
ReadonlyBytes m_slice;