Add PostScript name and font revision retrival method (47b6c1bc) · Commits · e / os / android_frameworks_base

graphics/java/android/graphics/fonts/FontFileUtil.java

+42 −0

Original line number	Diff line number	Diff line
		@@ -20,6 +20,8 @@ import android.annotation.IntRange;
		import android.annotation.NonNull;
		import android.annotation.Nullable;

		import dalvik.annotation.optimization.FastNative;

		import java.nio.ByteBuffer;
		import java.nio.ByteOrder;

		@@ -131,4 +133,44 @@ public class FontFileUtil {
		buffer.order(originalOrder);
		}
		}

		/**
		* Analyze head OpenType table and return fontRevision value as 32bit integer.
		*
		* The font revision is stored in 16.16 bit fixed point value. This function returns this fixed
		* point value as 32 bit integer, i.e. the value multiplied with 65536.
		*
		* IllegalArgumentException will be thrown for invalid font data.
		* If the font file is invalid, returns -1L.
		*
		* @param buffer a buffer of OpenType font
		* @param index a font index
		* @return font revision that shifted 16 bits left.
		*/
		public static long getRevision(@NonNull ByteBuffer buffer, @IntRange(from = 0) int index) {
		return nGetFontRevision(buffer, index);
		}

		/**
		* Analyze name OpenType table and return PostScript name.
		*
		* IllegalArgumentException will be thrown for invalid font data.
		* null will be returned if not found or the PostScript name is invalid.
		*
		* @param buffer a buffer of OpenType font
		* @param index a font index
		* @return a post script name or null if it is invalid or not found.
		*/
		public static String getPostScriptName(@NonNull ByteBuffer buffer,
		@IntRange(from = 0) int index) {
		return nGetFontPostScriptName(buffer, index);
		}

		@FastNative
		private static native long nGetFontRevision(@NonNull ByteBuffer buffer,
		@IntRange(from = 0) int index);

		@FastNative
		private static native String nGetFontPostScriptName(@NonNull ByteBuffer buffer,
		@IntRange(from = 0) int index);
		}

libs/hwui/jni/fonts/Font.cpp

+55 −1

Original line number	Diff line number	Diff line
		@@ -33,6 +33,7 @@
		#include <hwui/Paint.h>
		#include <hwui/Typeface.h>
		#include <minikin/FontFamily.h>
		#include <minikin/FontFileParser.h>
		#include <ui/FatVector.h>

		#include <memory>
		@@ -233,6 +234,51 @@ static jlong FontBufferHelper_getReleaseFunc(CRITICAL_JNI_PARAMS) {

		///////////////////////////////////////////////////////////////////////////////

		// Fast Native
		static jlong FontFileUtil_getFontRevision(JNIEnv* env, jobject, jobject buffer, jint index) {
		NPE_CHECK_RETURN_ZERO(env, buffer);
		const void* fontPtr = env->GetDirectBufferAddress(buffer);
		if (fontPtr == nullptr) {
		jniThrowException(env, "java/lang/IllegalArgumentException", "Not a direct buffer");
		return 0;
		}
		jlong fontSize = env->GetDirectBufferCapacity(buffer);
		if (fontSize <= 0) {
		jniThrowException(env, "java/lang/IllegalArgumentException",
		"buffer size must not be zero or negative");
		return 0;
		}
		minikin::FontFileParser parser(fontPtr, fontSize, index);
		std::optional<uint32_t> revision = parser.getFontRevision();
		if (!revision.has_value()) {
		return -1L;
		}
		return revision.value();
		}

		static jstring FontFileUtil_getFontPostScriptName(JNIEnv* env, jobject, jobject buffer,
		jint index) {
		NPE_CHECK_RETURN_ZERO(env, buffer);
		const void* fontPtr = env->GetDirectBufferAddress(buffer);
		if (fontPtr == nullptr) {
		jniThrowException(env, "java/lang/IllegalArgumentException", "Not a direct buffer");
		return nullptr;
		}
		jlong fontSize = env->GetDirectBufferCapacity(buffer);
		if (fontSize <= 0) {
		jniThrowException(env, "java/lang/IllegalArgumentException",
		"buffer size must not be zero or negative");
		return nullptr;
		}
		minikin::FontFileParser parser(fontPtr, fontSize, index);
		std::optional<std::string> psName = parser.getPostScriptName();
		if (!psName.has_value()) {
		return nullptr; // null
		}
		return env->NewStringUTF(psName->c_str());
		}
		///////////////////////////////////////////////////////////////////////////////

		static const JNINativeMethod gFontBuilderMethods[] = {
		{ "nInitBuilder", "()J", (void*) Font_Builder_initBuilder },
		{ "nAddAxis", "(JIF)V", (void*) Font_Builder_addAxis },
		@@ -254,13 +300,21 @@ static const JNINativeMethod gFontBufferHelperMethods[] = {
		{ "nGetReleaseFunc", "()J", (void*) FontBufferHelper_getReleaseFunc },
		};

		static const JNINativeMethod gFontFileUtilMethods[] = {
		{ "nGetFontRevision", "(Ljava/nio/ByteBuffer;I)J", (void*) FontFileUtil_getFontRevision },
		{ "nGetFontPostScriptName", "(Ljava/nio/ByteBuffer;I)Ljava/lang/String;",
		(void*) FontFileUtil_getFontPostScriptName },
		};

		int register_android_graphics_fonts_Font(JNIEnv* env) {
		return RegisterMethodsOrDie(env, "android/graphics/fonts/Font$Builder", gFontBuilderMethods,
		NELEM(gFontBuilderMethods)) +
		RegisterMethodsOrDie(env, "android/graphics/fonts/Font", gFontMethods,
		NELEM(gFontMethods)) +
		RegisterMethodsOrDie(env, "android/graphics/fonts/NativeFontBufferHelper",
		gFontBufferHelperMethods, NELEM(gFontBufferHelperMethods));
		gFontBufferHelperMethods, NELEM(gFontBufferHelperMethods)) +
		RegisterMethodsOrDie(env, "android/graphics/fonts/FontFileUtil", gFontFileUtilMethods,
		NELEM(gFontFileUtilMethods));
		}

		namespace fonts {