mirror of
https://github.com/MyLuxy/overdrive.git
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53 lines
2.0 KiB
C++
53 lines
2.0 KiB
C++
// Copyright (C) 2026 half144 and PS5 React contributors
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// SPDX-License-Identifier: GPL-3.0-or-later
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// Additional attribution term: see LICENSE-ATTRIBUTION.
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// Build-time font subsetter for tools/text_fonts.py, linked against the pinned HarfBuzz:
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// font-subset <input.otf|ttf> <output> <codepoints-file>
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// The codepoints file lists hexadecimal codepoints separated by whitespace. Layout tables are kept
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// (with their glyph closure) for runtime shaping; hinting is dropped because the runtime
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// rasterizer does not hint.
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#include <hb-subset.h>
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#include <cstdio>
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#include <cstdlib>
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int main(int argc, char** argv) {
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if (argc != 4) {
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std::fprintf(stderr, "usage: font-subset <input> <output> <codepoints-file>\n");
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return 2;
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}
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hb_blob_t* blob = hb_blob_create_from_file_or_fail(argv[1]);
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if (!blob) {
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std::fprintf(stderr, "font-subset: cannot read %s\n", argv[1]);
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return 1;
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}
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hb_face_t* face = hb_face_create(blob, 0);
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hb_subset_input_t* input = hb_subset_input_create_or_fail();
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FILE* list = std::fopen(argv[3], "r");
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if (!input || !list) {
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std::fprintf(stderr, "font-subset: cannot read %s\n", argv[3]);
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return 1;
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}
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hb_set_t* unicodes = hb_subset_input_unicode_set(input);
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unsigned codepoint;
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while (std::fscanf(list, "%x", &codepoint) == 1) hb_set_add(unicodes, codepoint);
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std::fclose(list);
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hb_set_t* features = hb_subset_input_set(input, HB_SUBSET_SETS_LAYOUT_FEATURE_TAG);
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hb_set_clear(features);
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hb_set_invert(features);
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hb_subset_input_set_flags(input, HB_SUBSET_FLAGS_NO_HINTING);
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hb_face_t* subset = hb_subset_or_fail(face, input);
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if (!subset) {
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std::fprintf(stderr, "font-subset: subsetting %s failed\n", argv[1]);
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return 1;
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}
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hb_blob_t* result = hb_face_reference_blob(subset);
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unsigned length = 0;
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const char* data = hb_blob_get_data(result, &length);
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FILE* out = std::fopen(argv[2], "wb");
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if (!out || std::fwrite(data, 1, length, out) != length || std::fclose(out) != 0) {
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std::fprintf(stderr, "font-subset: cannot write %s\n", argv[2]);
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return 1;
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}
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return 0;
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}
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