fonts: Replace mincho font with IPA Mincho

Switch the bundled mincho font from a Source Han Serif JP subset to a
subset of IPA Mincho, which has monospace ASCII glyphs.

IPA Mincho's hhea ascent/descent already match its OS/2 typo metrics, so
adjust_metrics.py is no longer needed. However, IPA Mincho is distributed
under the IPA Font License v1.0, under which a subset is a "Derived
Program"; Article 3.1(4) forbids the derived font's name from containing
the licensed program's name ("IPA"). Add rename_font.py to rewrite the
name table accordingly, and replace licenses/mincho.txt with the IPA Font
License.

android/app/jni/CMakeLists.txt

@@ -42,7 +42,7 @@ add_subdirectory(${PROJECT_ROOT_DIR} xsystem35)
 set(ASSETS_DIR ${CMAKE_CURRENT_SOURCE_DIR}/../src/main/assets)
 file(MAKE_DIRECTORY ${ASSETS_DIR}/licenses)
 file(COPY_FILE ${PROJECT_ROOT_DIR}/fonts/MTLc3m.ttf ${ASSETS_DIR}/MTLc3m.ttf)
-file(COPY_FILE ${PROJECT_ROOT_DIR}/fonts/mincho.otf ${ASSETS_DIR}/mincho.otf)
+file(COPY_FILE ${PROJECT_ROOT_DIR}/fonts/mincho.ttf ${ASSETS_DIR}/mincho.ttf)
 file(COPY_FILE ${PROJECT_ROOT_DIR}/COPYING ${ASSETS_DIR}/licenses/xsystem35)
 file(COPY_FILE ${PROJECT_ROOT_DIR}/licenses/MTLc3m.txt ${ASSETS_DIR}/licenses/MTLc3m)
 file(COPY_FILE ${PROJECT_ROOT_DIR}/licenses/mincho.txt ${ASSETS_DIR}/licenses/mincho)

android/app/src/main/java/io/github/kichikuou/xsystem35/LicensesMenuActivity.kt

@@ -17,7 +17,7 @@ class LicensesMenuActivity : Activity() {
         Entry("FreeType", "freetype", "https://freetype.org/"),
         Entry("HarfBuzz", "harfbuzz", "https://harfbuzz.github.io/"),
         Entry("MotoyaLCedar W3 mono", "MTLc3m", "https://github.com/aosp-mirror/platform_frameworks_base/tree/lollipop-release/data/fonts"),
-        Entry("Source Han Serif", "mincho", "https://github.com/adobe-fonts/source-han-serif/"),
+        Entry("IPA明朝", "mincho", "https://moji.or.jp/ipafont/"),
     )
 
     override fun onCreate(savedInstanceState: Bundle?) {