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LibGfx: Read WOFF2 transformed GLYF table buffers in-place

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This saves us from having to allocate a buffer and copying the data,
when it's already available to us. Also, less code. :^)
This commit is contained in:
Sam Atkins 2023-10-21 14:02:17 +01:00 • committed by Andreas Kling
parent 9642a0f43a
commit ad717af63d
1 changed files with 8 additions and 34 deletions
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42
Userland/Libraries/LibGfx/Font/WOFF2/Font.cpp
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@ -561,47 +561,21 @@ static ErrorOr<GlyfAndLocaTableBuffers> create_glyf_and_loca_tables_from_transfo
if (table_size < total_size_of_streams)
return Error::from_string_literal("Not enough data to read in streams of transformed glyf table");
auto all_tables_buffer = TRY(ByteBuffer::create_zeroed(total_size_of_streams));
u64 all_tables_buffer_offset = 0;
auto number_of_contours_stream_buffer = TRY(table_stream.read_some(all_tables_buffer.span().slice(all_tables_buffer_offset, header.n_contour_stream_size)));
auto number_of_contours_stream = FixedMemoryStream(number_of_contours_stream_buffer);
all_tables_buffer_offset += header.n_contour_stream_size;
auto number_of_points_stream_buffer = TRY(table_stream.read_some(all_tables_buffer.span().slice(all_tables_buffer_offset, header.n_points_stream_size)));
auto number_of_points_stream = FixedMemoryStream(number_of_points_stream_buffer);
all_tables_buffer_offset += header.n_points_stream_size;
auto flag_stream_buffer = all_tables_buffer.span().slice(all_tables_buffer_offset, header.flag_stream_size);
TRY(table_stream.read_until_filled(flag_stream_buffer));
auto flag_stream = FixedMemoryStream(flag_stream_buffer);
all_tables_buffer_offset += header.flag_stream_size;
auto glyph_stream_buffer = all_tables_buffer.span().slice(all_tables_buffer_offset, header.glyph_stream_size);
TRY(table_stream.read_until_filled(glyph_stream_buffer));
auto glyph_stream = FixedMemoryStream(glyph_stream_buffer);
all_tables_buffer_offset += header.glyph_stream_size;
auto composite_stream_buffer = all_tables_buffer.span().slice(all_tables_buffer_offset, header.composite_stream_size);
TRY(table_stream.read_until_filled(composite_stream_buffer));
auto composite_stream = FixedMemoryStream(composite_stream_buffer);
all_tables_buffer_offset += header.composite_stream_size;
auto number_of_contours_stream = FixedMemoryStream(TRY(table_stream.read_in_place<u8>(header.n_contour_stream_size)));
auto number_of_points_stream = FixedMemoryStream(TRY(table_stream.read_in_place<u8>(header.n_points_stream_size)));
auto flag_stream = FixedMemoryStream(TRY(table_stream.read_in_place<u8>(header.flag_stream_size)));
auto glyph_stream = FixedMemoryStream(TRY(table_stream.read_in_place<u8>(header.glyph_stream_size)));
auto composite_stream = FixedMemoryStream(TRY(table_stream.read_in_place<u8>(header.composite_stream_size)));
size_t bounding_box_bitmap_length = ((header.num_glyphs + 31) >> 5) << 2;
auto bounding_box_bitmap_stream_buffer = TRY(table_stream.read_some(all_tables_buffer.span().slice(all_tables_buffer_offset, bounding_box_bitmap_length)));
auto bounding_box_bitmap_memory_stream = FixedMemoryStream(bounding_box_bitmap_stream_buffer);
auto bounding_box_bitmap_memory_stream = FixedMemoryStream(TRY(table_stream.read_in_place<u8>(bounding_box_bitmap_length)));
auto bounding_box_bitmap_bit_stream = BigEndianInputBitStream { MaybeOwned<Stream>(bounding_box_bitmap_memory_stream) };
all_tables_buffer_offset += bounding_box_bitmap_length;
if (header.bbox_stream_size < bounding_box_bitmap_length)
return Error::from_string_literal("Not enough data to read bounding box stream of transformed glyf table");
auto bounding_box_stream_buffer = TRY(table_stream.read_some(all_tables_buffer.span().slice(all_tables_buffer_offset, header.bbox_stream_size - bounding_box_bitmap_length)));
auto bounding_box_stream = FixedMemoryStream(bounding_box_stream_buffer);
all_tables_buffer_offset += header.bbox_stream_size - bounding_box_bitmap_length;
auto bounding_box_stream = FixedMemoryStream(TRY(table_stream.read_in_place<u8>(header.bbox_stream_size - bounding_box_bitmap_length)));
auto instruction_buffer = all_tables_buffer.span().slice(all_tables_buffer_offset, header.instruction_stream_size);
TRY(table_stream.read_until_filled(instruction_buffer));
auto instruction_stream = FixedMemoryStream(instruction_buffer);
auto instruction_stream = FixedMemoryStream(TRY(table_stream.read_in_place<u8>(header.instruction_stream_size)));
ByteBuffer reconstructed_glyf_table;
Vector<u32> loca_indexes;