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