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# Minimal diff for harfbuzz 3.0.0 support; based on:
# https://github.com/google/skia/commit/66684b17b382
# https://github.com/google/skia/commit/51d83abcd24a
diff --git a/gn/skia.gni b/gn/skia.gni
index d98fdc19ee..199335d5c4 100644
--- a/gn/skia.gni
+++ b/gn/skia.gni
@@ -34,8 +34,6 @@ declare_args() {
skia_include_multiframe_procs = false
skia_lex = false
skia_libgifcodec_path = "third_party/externals/libgifcodec"
- skia_pdf_subset_harfbuzz =
- false # TODO: set skia_pdf_subset_harfbuzz to skia_use_harfbuzz.
skia_qt_path = getenv("QT_PATH")
skia_skqp_global_error_tolerance = 0
skia_tools_require_resources = false
@@ -99,6 +97,10 @@ declare_args() {
skia_use_libfuzzer_defaults = true
}
+declare_args() {
+ skia_pdf_subset_harfbuzz = skia_use_harfbuzz
+}
+
declare_args() {
skia_compile_sksl_tests = skia_compile_processors
skia_enable_fontmgr_android = skia_use_expat && skia_use_freetype
diff --git a/src/pdf/SkPDFSubsetFont.cpp b/src/pdf/SkPDFSubsetFont.cpp
index 81c37eef3a..2340a7937b 100644
--- a/src/pdf/SkPDFSubsetFont.cpp
+++ b/src/pdf/SkPDFSubsetFont.cpp
@@ -49,6 +49,37 @@ static sk_sp<SkData> to_data(HBBlob blob) {
blob.release());
}
+template<typename...> using void_t = void;
+template<typename T, typename = void>
+struct SkPDFHarfBuzzSubset {
+ // This is the HarfBuzz 3.0 interface.
+ // hb_subset_flags_t does not exist in 2.0. It isn't dependent on T, so inline the value of
+ // HB_SUBSET_FLAGS_RETAIN_GIDS until 2.0 is no longer supported.
+ static HBFace Make(T input, hb_face_t* face) {
+ // TODO: When possible, check if a font is 'tricky' with FT_IS_TRICKY.
+ // If it isn't known if a font is 'tricky', retain the hints.
+ hb_subset_input_set_flags(input, 2/*HB_SUBSET_FLAGS_RETAIN_GIDS*/);
+ return HBFace(hb_subset_or_fail(face, input));
+ }
+};
+template<typename T>
+struct SkPDFHarfBuzzSubset<T, void_t<
+ decltype(hb_subset_input_set_retain_gids(std::declval<T>(), std::declval<bool>())),
+ decltype(hb_subset_input_set_drop_hints(std::declval<T>(), std::declval<bool>())),
+ decltype(hb_subset(std::declval<hb_face_t*>(), std::declval<T>()))
+ >>
+{
+ // This is the HarfBuzz 2.0 (non-public) interface, used if it exists.
+ // This code should be removed as soon as all users are migrated to the newer API.
+ static HBFace Make(T input, hb_face_t* face) {
+ hb_subset_input_set_retain_gids(input, true);
+ // TODO: When possible, check if a font is 'tricky' with FT_IS_TRICKY.
+ // If it isn't known if a font is 'tricky', retain the hints.
+ hb_subset_input_set_drop_hints(input, false);
+ return HBFace(hb_subset(face, input));
+ }
+};
+
static sk_sp<SkData> subset_harfbuzz(sk_sp<SkData> fontData,
const SkPDFGlyphUse& glyphUsage,
int ttcIndex) {
@@ -71,11 +102,10 @@ static sk_sp<SkData> subset_harfbuzz(sk_sp<SkData> fontData,
hb_set_t* glyphs = hb_subset_input_glyph_set(input.get());
glyphUsage.getSetValues([&glyphs](unsigned gid) { hb_set_add(glyphs, gid);});
- hb_subset_input_set_retain_gids(input.get(), true);
- // TODO: When possible, check if a font is 'tricky' with FT_IS_TRICKY.
- // If it isn't known if a font is 'tricky', retain the hints.
- hb_subset_input_set_drop_hints(input.get(), false);
- HBFace subset(hb_subset(face.get(), input.get()));
+ HBFace subset = SkPDFHarfBuzzSubset<hb_subset_input_t*>::Make(input.get(), face.get());
+ if (!subset) {
+ return nullptr;
+ }
HBBlob result(hb_face_reference_blob(subset.get()));
return to_data(std::move(result));
}
diff --git a/third_party/harfbuzz/BUILD.gn b/third_party/harfbuzz/BUILD.gn
index 173830de62..4156607ef9 100644
--- a/third_party/harfbuzz/BUILD.gn
+++ b/third_party/harfbuzz/BUILD.gn
@@ -14,6 +14,9 @@ if (skia_use_system_harfbuzz) {
"harfbuzz",
"harfbuzz-icu",
]
+ if (skia_pdf_subset_harfbuzz) {
+ libs += [ "harfbuzz-subset" ]
+ }
}
} else {
third_party("harfbuzz") {
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