mirror of
https://github.com/LadybirdBrowser/ladybird.git
synced 2024-11-22 23:50:19 +00:00
88 lines
3.1 KiB
C++
88 lines
3.1 KiB
C++
/*
|
|
* Copyright (c) 2022, Nico Weber <thakis@chromium.org>
|
|
*
|
|
* SPDX-License-Identifier: BSD-2-Clause
|
|
*/
|
|
|
|
#include <LibGfx/Font/OpenType/Cmap.h>
|
|
#include <LibTest/TestCase.h>
|
|
|
|
TEST_CASE(test_cmap_format_4)
|
|
{
|
|
// clang-format off
|
|
// Big endian.
|
|
Array<u8, 52> const cmap_table =
|
|
{
|
|
// https://docs.microsoft.com/en-us/typography/opentype/spec/cmap#cmap-header
|
|
0, 0, // uint16 version
|
|
0, 1, // uint16 numTables
|
|
|
|
// https://docs.microsoft.com/en-us/typography/opentype/spec/cmap#encoding-records-and-encodings
|
|
0, 0, // uint16 platformID, 0 means "Unicode"
|
|
0, 3, // uint16 encodingID, 3 means "BMP only" for platformID==0.
|
|
0, 0, 0, 12, // Offset32 to encoding subtable.
|
|
|
|
// https://docs.microsoft.com/en-us/typography/opentype/spec/cmap#format-4-segment-mapping-to-delta-values
|
|
0, 4, // uint16 format = 4
|
|
0, 42, // uint16 length in bytes
|
|
0, 0, // uint16 language, must be 0
|
|
0, 6, // segCount * 2
|
|
0, 4, // searchRange
|
|
0, 1, // entrySelector
|
|
0, 2, // rangeShift
|
|
|
|
// endCode array, last entry must be 0xffff.
|
|
0, 128,
|
|
1, 0,
|
|
0xff, 0xff,
|
|
|
|
0, 0, // uint16 reservedPad
|
|
|
|
// startCode array
|
|
0, 16,
|
|
1, 0,
|
|
0xff, 0xff,
|
|
|
|
// delta array
|
|
0, 0,
|
|
0, 10,
|
|
0, 0,
|
|
|
|
// glyphID array
|
|
0, 0,
|
|
0, 0,
|
|
0, 0,
|
|
};
|
|
// clang-format on
|
|
auto cmap = OpenType::Cmap::from_slice(cmap_table.span()).value();
|
|
cmap.set_active_index(0);
|
|
|
|
// Format 4 can't handle code points > 0xffff.
|
|
|
|
// First range is 16..128.
|
|
EXPECT_EQ(cmap.glyph_id_for_code_point(15), 0u);
|
|
EXPECT_EQ(cmap.glyph_id_for_code_point(16), 16u);
|
|
EXPECT_EQ(cmap.glyph_id_for_code_point(128), 128u);
|
|
EXPECT_EQ(cmap.glyph_id_for_code_point(129), 0u);
|
|
|
|
// Second range is 256..256, with delta 10.
|
|
EXPECT_EQ(cmap.glyph_id_for_code_point(255), 0u);
|
|
EXPECT_EQ(cmap.glyph_id_for_code_point(256), 266u);
|
|
EXPECT_EQ(cmap.glyph_id_for_code_point(257), 0u);
|
|
|
|
// Third range is 0xffff..0xffff.
|
|
// From https://docs.microsoft.com/en-us/typography/opentype/spec/cmap#format-4-segment-mapping-to-delta-values:
|
|
// "the final start code and endCode values must be 0xFFFF. This segment need not contain any valid mappings.
|
|
// (It can just map the single character code 0xFFFF to missingGlyph). However, the segment must be present."
|
|
// FIXME: Make OpenType::Cmap::from_slice() reject inputs where this isn't true.
|
|
EXPECT_EQ(cmap.glyph_id_for_code_point(0xfeff), 0u);
|
|
EXPECT_EQ(cmap.glyph_id_for_code_point(0xffff), 0xffffu);
|
|
EXPECT_EQ(cmap.glyph_id_for_code_point(0x1'0000), 0u);
|
|
|
|
// Set the number of subtables to a value, where the record offset for the last subtable is greater than the
|
|
// total table size. We should not crash if a Cmap table is truncated in this way.
|
|
auto malformed_cmap_table = cmap_table;
|
|
malformed_cmap_table[3] = 13;
|
|
auto cmap_with_invalid_subtable_offset = OpenType::Cmap::from_slice(malformed_cmap_table.span()).value();
|
|
EXPECT(!cmap_with_invalid_subtable_offset.subtable(12).has_value());
|
|
}
|