[perf] Start writing subset benchmarks.
diff --git a/perf/benchmark-subset.cc b/perf/benchmark-subset.cc
new file mode 100644
index 0000000..5929d46
--- /dev/null
+++ b/perf/benchmark-subset.cc
@@ -0,0 +1,70 @@
+#include "benchmark/benchmark.h"
+
+#include "hb-subset.h"
+
+void AddCodepoints(const hb_set_t* codepoints_in_font,
+ unsigned subset_size,
+ hb_subset_input_t* input)
+{
+ hb_codepoint_t cp = HB_SET_VALUE_INVALID;
+ for (unsigned i = 0; i < subset_size; i++) {
+ // TODO(garretrieger): pick randomly.
+ assert (hb_set_next (codepoints_in_font, &cp));
+ hb_set_add (hb_subset_input_unicode_set (input), cp);
+ }
+}
+
+/* benchmark for subsetting a font */
+static void BM_subset_codepoints (benchmark::State &state,
+ const char *font_path,
+ unsigned subset_size)
+{
+ hb_face_t *face;
+ {
+ hb_blob_t *blob = hb_blob_create_from_file_or_fail (font_path);
+ assert (blob);
+ face = hb_face_create (blob, 0);
+ hb_blob_destroy (blob);
+ }
+
+ hb_subset_input_t* input = hb_subset_input_create_or_fail ();
+ assert (input);
+
+ {
+ hb_set_t* all_codepoints = hb_set_create ();
+ hb_face_collect_unicodes (face, all_codepoints);
+
+ AddCodepoints(all_codepoints, subset_size, input);
+
+ hb_set_destroy (all_codepoints);
+ }
+
+ for (auto _ : state)
+ {
+ hb_face_t* subset = hb_subset_or_fail (face, input);
+ assert (subset);
+ hb_face_destroy (subset);
+ }
+
+ hb_subset_input_destroy (input);
+ hb_face_destroy (face);
+}
+
+// TODO(garretrieger): Use range() for subset size.
+BENCHMARK_CAPTURE (BM_subset_codepoints, subset_roboto_10,
+ "perf/fonts/Roboto-Regular.ttf", 10)
+ ->Unit(benchmark::kMicrosecond);
+
+BENCHMARK_CAPTURE (BM_subset_codepoints, subset_roboto_100,
+ "perf/fonts/Roboto-Regular.ttf", 100)
+ ->Unit(benchmark::kMicrosecond);
+
+BENCHMARK_CAPTURE (BM_subset_codepoints, subset_noto_nastaliq_urdu_10,
+ "perf/fonts/NotoNastaliqUrdu-Regular.ttf", 10)
+ ->Unit(benchmark::kMicrosecond);
+
+BENCHMARK_CAPTURE (BM_subset_codepoints, subset_noto_nastaliq_urdu_100,
+ "perf/fonts/NotoNastaliqUrdu-Regular.ttf", 100)
+ ->Unit(benchmark::kMicrosecond);
+
+BENCHMARK_MAIN();
diff --git a/perf/meson.build b/perf/meson.build
index 084b902..e7681bf 100644
--- a/perf/meson.build
+++ b/perf/meson.build
@@ -40,3 +40,13 @@
link_with: [libharfbuzz],
install: false,
), workdir: meson.current_source_dir() / '..', timeout: 100)
+
+benchmark('benchmark-subset', executable('benchmark-subset', 'benchmark-subset.cc',
+ dependencies: [
+ google_benchmark_dep,
+ ],
+ cpp_args: [],
+ include_directories: [incconfig, incsrc],
+ link_with: [libharfbuzz, libharfbuzz_subset],
+ install: false,
+), workdir: meson.current_source_dir() / '..', timeout: 100)
