dev-qt/qtwebengine: add Fedora patch for >= harfbuzz 3

I'd like to add the patches Google used for Chromium
but we know this one works and I'd like the tree to be in a
working state. Can swap patches later.

Signed-off-by: Sam James <[email protected]>

dev-qt/qtwebengine/files/qtwebengine-5.15.2_p20210824-harfbuzz-3.0.0.patch

@@ -0,0 +1,32 @@
+https://src.fedoraproject.org/rpms/qt5-qtwebengine/raw/rawhide/f/qtwebengine-harfbuzz.patch
+--- a/src/3rdparty/chromium/components/paint_preview/common/subset_font.cc
++++ b/src/3rdparty/chromium/components/paint_preview/common/subset_font.cc
+@@ -71,9 +71,9 @@ sk_sp<SkData> SubsetFont(SkTypeface* typeface, const GlyphUsage& usage) {
+ hb_set_t* glyphs =
+ hb_subset_input_glyph_set(input.get()); // Owned by |input|.
+ usage.ForEach(base::BindRepeating(&AddGlyphs, base::Unretained(glyphs)));
+- hb_subset_input_set_retain_gids(input.get(), true);
++ hb_subset_input_set_flags(input.get(), HB_SUBSET_FLAGS_RETAIN_GIDS);
+
+- HbScoped<hb_face_t> subset_face(hb_subset(face.get(), input.get()));
++ HbScoped<hb_face_t> subset_face(hb_subset_or_fail(face.get(), input.get()));
+ HbScoped<hb_blob_t> subset_blob(hb_face_reference_blob(subset_face.get()));
+ if (!subset_blob)
+ return nullptr;
+--- a/src/3rdparty/chromium/third_party/skia/src/pdf/SkPDFSubsetFont.cpp
++++ b/src/3rdparty/chromium/third_party/skia/src/pdf/SkPDFSubsetFont.cpp
+@@ -71,11 +71,10 @@ 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()));
++ hb_subset_input_set_flags(input.get(), HB_SUBSET_FLAGS_RETAIN_GIDS | HB_SUBSET_FLAGS_NO_HINTING);
++ HBFace subset(hb_subset_or_fail(face.get(), input.get()));
+ HBBlob result(hb_face_reference_blob(subset.get()));
+ return to_data(std::move(result));
+ }
+

dev-qt/qtwebengine/qtwebengine-5.15.2_p20210824-r1.ebuild

@@ -169,6 +169,13 @@ src_prepare() {
  done < <(find src/3rdparty/chromium/third_party/icu -type f "(" -name "*.c" -o -name "*.cpp" -o -name "*.h" ")" 2>/dev/null)
  fi
 
+ if has_version ">=media-libs/harfbuzz-3.0.0-r1"; then
+ # We can get away with conditionally applying this with has_version
+ # because we have a := dep on harfbuzz and the subslot changed
+ # at 3.0.0.
+ eapply "${FILESDIR}/qtwebengine-5.15.2_p20210824-harfbuzz-3.0.0.patch"
+ fi
+
  qt_use_disable_config alsa webengine-alsa src/buildtools/config/linux.pri
  qt_use_disable_config pulseaudio webengine-pulseaudio src/buildtools/config/linux.pri