Add Font file path if it is created from native.

Bug: 170492880
Test: TextShaperTest
Change-Id: I8d669861c6d3ef362467d9bcf04a404c2780199c

core/tests/coretests/src/android/text/TextShaperTest.java

@@ -0,0 +1,46 @@
+/*
+ * Copyright (C) 2020 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package android.text;
+
+import static com.google.common.truth.Truth.assertThat;
+
+import android.graphics.text.PositionedGlyphs;
+
+import androidx.test.filters.SmallTest;
+import androidx.test.runner.AndroidJUnit4;
+
+import org.junit.Test;
+import org.junit.runner.RunWith;
+
+import java.util.List;
+
+@SmallTest
+@RunWith(AndroidJUnit4.class)
+public class TextShaperTest {
+
+    @Test
+    public void testFontWithPath() {
+        TextPaint p = new TextPaint();
+        p.setFontFeatureSettings("'wght' 900");
+        List<PositionedGlyphs> glyphs = StyledTextShaper.shapeText("a", 0, 1,
+                TextDirectionHeuristics.LTR, p);
+        assertThat(glyphs.size()).isEqualTo(1);
+        // This test only passes if the font of the Latin font is variable font.
+        assertThat(glyphs.get(0).getFont(0).getFile()).isNotNull();
+
+    }
+}

graphics/java/android/graphics/fonts/Font.java

@@ -687,7 +687,9 @@ public final class Font {
                 charBuffer[3] = (char) ((packedAxis & 0x0000_00FF_0000_0000L) >> 32);
                 axes[i] = new FontVariationAxis(new String(charBuffer), value);
             }
-            Font.Builder builder = new Font.Builder(buffer)
+            String path = nGetFontPath(ptr);
+            File file = (path == null) ? null : new File(path);
+            Font.Builder builder = new Font.Builder(buffer, file, "")
                     .setWeight(weight)
                     .setSlant(italic ? FontStyle.FONT_SLANT_ITALIC : FontStyle.FONT_SLANT_UPRIGHT)
                     .setTtcIndex(ttcIndex)
@@ -711,6 +713,9 @@ public final class Font {
     @CriticalNative
     private static native long nGetAxisInfo(long ptr, int i);
 
+    @FastNative
+    private static native String nGetFontPath(long ptr);
+
     @FastNative
     private static native float nGetGlyphBounds(long font, int glyphId, long paint, RectF rect);
 

libs/hwui/jni/fonts/Font.cpp

@@ -221,6 +221,17 @@ static jlong Font_getAxisInfo(CRITICAL_JNI_PARAMS_COMMA jlong fontHandle, jint i
     return (static_cast<uint64_t>(var.axisTag) << 32) | static_cast<uint64_t>(floatBinary);
 }
 
+// FastNative
+static jstring Font_getFontPath(JNIEnv* env, jobject, jlong fontHandle) {
+    const minikin::Font* font = reinterpret_cast<minikin::Font*>(fontHandle);
+    MinikinFontSkia* minikinSkia = static_cast<MinikinFontSkia*>(font->typeface().get());
+    const std::string& filePath = minikinSkia->getFilePath();
+    if (filePath.empty()) {
+        return nullptr;
+    }
+    return env->NewStringUTF(filePath.c_str());
+}
+
 // Critical Native
 static jlong Font_getNativeFontPtr(CRITICAL_JNI_PARAMS_COMMA jlong fontHandle) {
     FontWrapper* font = reinterpret_cast<FontWrapper*>(fontHandle);
@@ -274,6 +285,7 @@ static const JNINativeMethod gFontMethods[] = {
     { "nGetFontMetrics", "(JJLandroid/graphics/Paint$FontMetrics;)F", (void*) Font_getFontMetrics },
     { "nGetFontInfo", "(J)J", (void*) Font_getFontInfo },
     { "nGetAxisInfo", "(JI)J", (void*) Font_getAxisInfo },
+    { "nGetFontPath", "(J)Ljava/lang/String;", (void*) Font_getFontPath },
     { "nGetNativeFontPtr", "(J)J", (void*) Font_getNativeFontPtr },
 };