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LibGfx: Replace manual offsets when producing WOFF2 loca table

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Sam Atkins 2023-10-21 14:40:47 +01:00 • committed by Andreas Kling
parent 885665b3a6
commit e108f394bf
1 changed files with 7 additions and 21 deletions
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28
Userland/Libraries/LibGfx/Font/WOFF2/Font.cpp
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@ -104,20 +104,6 @@ static ErrorOr<u32> read_uint_base_128(SeekableStream& stream)
return Error::from_string_literal("UIntBase128 type is larger than 5 bytes");
}
static void be_u16(u8* ptr, u16 value)
{
ptr[0] = (value >> 8) & 0xff;
ptr[1] = value & 0xff;
}
static void be_u32(u8* ptr, u32 value)
{
ptr[0] = (value >> 24) & 0xff;
ptr[1] = (value >> 16) & 0xff;
ptr[2] = (value >> 8) & 0xff;
ptr[3] = value & 0xff;
}
static i16 be_i16(u8 const* ptr)
{
return (((i16)ptr[0]) << 8) | ((i16)ptr[1]);
@ -831,15 +817,15 @@ static ErrorOr<GlyfAndLocaTableBuffers> create_glyf_and_loca_tables_from_transfo
size_t loca_element_size_in_bytes = loca_element_size == LocaElementSize::TwoBytes ? sizeof(u16) : sizeof(u32);
size_t loca_table_buffer_size = loca_indexes.size() * loca_element_size_in_bytes;
ByteBuffer loca_table_buffer = TRY(ByteBuffer::create_zeroed(loca_table_buffer_size));
for (size_t loca_indexes_index = 0; loca_indexes_index < loca_indexes.size(); ++loca_indexes_index) {
u32 loca_index = loca_indexes.at(loca_indexes_index);
size_t loca_offset = loca_indexes_index * loca_element_size_in_bytes;
ByteBuffer loca_table_buffer;
TRY(loca_table_buffer.try_ensure_capacity(loca_table_buffer_size));
for (auto loca_index : loca_indexes) {
if (loca_element_size == LocaElementSize::TwoBytes) {
be_u16(loca_table_buffer.offset_pointer(loca_offset), loca_index >> 1);
auto value = BigEndian<u16>(loca_index >> 1);
loca_table_buffer.append({ &value, sizeof(value) });
} else {
be_u32(loca_table_buffer.offset_pointer(loca_offset), loca_index);
auto value = BigEndian<u32>(loca_index);
loca_table_buffer.append({ &value, sizeof(value) });
}
}