Calculate set of available fonts in native

The previous attempt[1] of improving SystemFonts API is not good enough
for users. To further improve the performance, calculate font uniqueness
in native code. From Android S, the system font information is stored
in native code and has more information for skipping duplication check.

Bug: 188201287
Test: atest FontFamilyUpdateRequestTest
Test: atest FontListParserTest
Test: atest FontManagerTest
Test: atest NativeSystemFontTest
Test: atest PersistentSystemFontConfigTest
Test: atest SystemFontsTest
Test: atest SystemFontsUniqueNameTest
Test: atest UpdatableFontDirTest
Test: atest UpdatableSystemFontTest
Test: minikin_tests
Change-Id: Ib375dcda0f278c93ec8dd21636d7a22b4174f214

1 files changed, 20 insertions, 0 deletions

diff --git a/libs/hwui/jni/fonts/Font.cpp b/libs/hwui/jni/fonts/Font.cpp
index 5a972f56ea87..bd3b7c93466c 100644
--- a/libs/hwui/jni/fonts/Font.cpp
+++ b/libs/hwui/jni/fonts/Font.cpp
@@ -35,6 +35,7 @@
 #include <minikin/FontFamily.h>
 #include <minikin/FontFileParser.h>
 #include <minikin/LocaleList.h>
+#include <minikin/SystemFonts.h>
 #include <ui/FatVector.h>
 
 #include <memory>
@@ -282,6 +283,22 @@ static jint Font_getSourceId(CRITICAL_JNI_PARAMS_COMMA jlong fontPtr) {
     return font->font->typeface()->GetSourceId();
 }
 
+static jlongArray Font_getAvailableFontSet(JNIEnv* env, jobject) {
+    std::vector<jlong> refArray;
+    minikin::SystemFonts::getFontSet(
+            [&refArray](const std::vector<std::shared_ptr<minikin::Font>>& fontSet) {
+                refArray.reserve(fontSet.size());
+                for (const auto& font : fontSet) {
+                    std::shared_ptr<minikin::Font> fontRef = font;
+                    refArray.push_back(
+                            reinterpret_cast<jlong>(new FontWrapper(std::move(fontRef))));
+                }
+            });
+    jlongArray r = env->NewLongArray(refArray.size());
+    env->SetLongArrayRegion(r, 0, refArray.size(), refArray.data());
+    return r;
+}
+
 // Fast Native
 static jlong FontFileUtil_getFontRevision(JNIEnv* env, jobject, jobject buffer, jint index) {
     NPE_CHECK_RETURN_ZERO(env, buffer);
@@ -373,6 +390,9 @@ static const JNINativeMethod gFontMethods[] = {
         {"nGetAxisCount", "(J)I", (void*)Font_getAxisCount},
         {"nGetAxisInfo", "(JI)J", (void*)Font_getAxisInfo},
         {"nGetSourceId", "(J)I", (void*)Font_getSourceId},
+
+        // System font accessors
+        {"nGetAvailableFontSet", "()[J", (void*)Font_getAvailableFontSet},
 };
 
 static const JNINativeMethod gFontFileUtilMethods[] = {