Build native android graphics library for desktop

The purpose of this is to be able to use the native graphics code from
the Android platform directly in Android Studio (running on desktop) to
do layout rendering.

This creates a host library that is a subset of libandroid_runtime
including only the JNI files relevant to Android graphics. It also
includes LayoutlibLoader.cpp which is used to load the JNI when using
it as part of layoutlib (the graphics library for Android Studio).

This also creates libhwui-host, a host library that is a subset of
libhwui.

Bug: 117921091
Test: lunch sdk && m libandroid_runtime
Change-Id: I3850020d2d4c13c85e377476bc463d3eb6a01c6d

1 files changed, 204 insertions, 0 deletions

diff --git a/core/jni/LayoutlibLoader.cpp b/core/jni/LayoutlibLoader.cpp
new file mode 100644
index 000000000000..b0dbb68637a3
--- /dev/null
+++ b/core/jni/LayoutlibLoader.cpp
@@ -0,0 +1,204 @@
+/*
+ * Copyright (C) 2018 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.
+ */
+
+#include "jni.h"
+#include "core_jni_helpers.h"
+
+#include <unicode/putil.h>
+#include <vector>
+
+using namespace std;
+
+/*
+ * This is responsible for setting up the JNI environment for communication between
+ * the Java and native parts of layoutlib, including registering native methods.
+ * This is mostly achieved by copying the way it is done in the platform
+ * (see AndroidRuntime.cpp).
+ */
+
+static JavaVM* javaVM;
+
+extern int register_android_graphics_Bitmap(JNIEnv*);
+extern int register_android_graphics_BitmapFactory(JNIEnv*);
+extern int register_android_graphics_ByteBufferStreamAdaptor(JNIEnv* env);
+extern int register_android_graphics_CreateJavaOutputStreamAdaptor(JNIEnv* env);
+extern int register_android_graphics_Graphics(JNIEnv* env);
+extern int register_android_graphics_ImageDecoder(JNIEnv*);
+extern int register_android_graphics_MaskFilter(JNIEnv* env);
+extern int register_android_graphics_NinePatch(JNIEnv*);
+extern int register_android_graphics_PathEffect(JNIEnv* env);
+extern int register_android_graphics_Shader(JNIEnv* env);
+extern int register_android_graphics_Typeface(JNIEnv* env);
+
+namespace android {
+
+extern int register_android_animation_PropertyValuesHolder(JNIEnv *env);
+extern int register_android_graphics_Canvas(JNIEnv* env);
+extern int register_android_graphics_ColorFilter(JNIEnv* env);
+extern int register_android_graphics_ColorSpace(JNIEnv* env);
+extern int register_android_graphics_DrawFilter(JNIEnv* env);
+extern int register_android_graphics_FontFamily(JNIEnv* env);
+extern int register_android_graphics_Matrix(JNIEnv* env);
+extern int register_android_graphics_Paint(JNIEnv* env);
+extern int register_android_graphics_Path(JNIEnv* env);
+extern int register_android_graphics_PathMeasure(JNIEnv* env);
+extern int register_android_graphics_Picture(JNIEnv* env);
+extern int register_android_graphics_Region(JNIEnv* env);
+extern int register_android_graphics_drawable_AnimatedVectorDrawable(JNIEnv* env);
+extern int register_android_graphics_drawable_VectorDrawable(JNIEnv* env);
+extern int register_android_graphics_fonts_Font(JNIEnv* env);
+extern int register_android_graphics_fonts_FontFamily(JNIEnv* env);
+extern int register_android_graphics_text_LineBreaker(JNIEnv* env);
+extern int register_android_graphics_text_MeasuredText(JNIEnv* env);
+extern int register_android_util_PathParser(JNIEnv* env);
+extern int register_com_android_internal_util_VirtualRefBasePtr(JNIEnv *env);
+extern int register_com_android_internal_view_animation_NativeInterpolatorFactoryHelper(JNIEnv *env);
+
+#define REG_JNI(name)      { name }
+struct RegJNIRec {
+    int (*mProc)(JNIEnv*);
+};
+
+static const RegJNIRec gRegJNI[] = {
+    REG_JNI(register_android_animation_PropertyValuesHolder),
+    REG_JNI(register_android_graphics_Bitmap),
+    REG_JNI(register_android_graphics_BitmapFactory),
+    REG_JNI(register_android_graphics_ByteBufferStreamAdaptor),
+    REG_JNI(register_android_graphics_Canvas),
+    REG_JNI(register_android_graphics_ColorFilter),
+    REG_JNI(register_android_graphics_ColorSpace),
+    REG_JNI(register_android_graphics_CreateJavaOutputStreamAdaptor),
+    REG_JNI(register_android_graphics_DrawFilter),
+    REG_JNI(register_android_graphics_FontFamily),
+    REG_JNI(register_android_graphics_Graphics),
+    REG_JNI(register_android_graphics_ImageDecoder),
+    REG_JNI(register_android_graphics_MaskFilter),
+    REG_JNI(register_android_graphics_Matrix),
+    REG_JNI(register_android_graphics_NinePatch),
+    REG_JNI(register_android_graphics_Paint),
+    REG_JNI(register_android_graphics_Path),
+    REG_JNI(register_android_graphics_PathEffect),
+    REG_JNI(register_android_graphics_PathMeasure),
+    REG_JNI(register_android_graphics_Picture),
+    REG_JNI(register_android_graphics_Region),
+    REG_JNI(register_android_graphics_Shader),
+    REG_JNI(register_android_graphics_Typeface),
+    REG_JNI(register_android_graphics_drawable_AnimatedVectorDrawable),
+    REG_JNI(register_android_graphics_drawable_VectorDrawable),
+    REG_JNI(register_android_graphics_fonts_Font),
+    REG_JNI(register_android_graphics_fonts_FontFamily),
+    REG_JNI(register_android_graphics_text_LineBreaker),
+    REG_JNI(register_android_graphics_text_MeasuredText),
+    REG_JNI(register_android_util_PathParser),
+    REG_JNI(register_com_android_internal_util_VirtualRefBasePtr),
+    REG_JNI(register_com_android_internal_view_animation_NativeInterpolatorFactoryHelper),
+};
+
+// Vector to store the names of classes that need delegates of their native methods
+static vector<string> classesToDelegate;
+
+static int register_jni_procs(const RegJNIRec array[], size_t count, JNIEnv* env) {
+    for (size_t i = 0; i < count; i++) {
+        if (array[i].mProc(env) < 0) {
+            return -1;
+        }
+    }
+    return 0;
+}
+
+int AndroidRuntime::registerNativeMethods(JNIEnv* env,
+        const char* className, const JNINativeMethod* gMethods, int numMethods) {
+
+    string classNameString = string(className);
+    if (find(classesToDelegate.begin(), classesToDelegate.end(), classNameString)
+            != classesToDelegate.end()) {
+        // Register native methods to the delegate class <classNameString>_NativeDelegate
+        // by adding _Original to the name of each method.
+        replace(classNameString.begin(), classNameString.end(), '$', '_');
+        string delegateClassName = classNameString + "_NativeDelegate";
+        jclass clazz = env->FindClass(delegateClassName.c_str());
+        JNINativeMethod gTypefaceDelegateMethods[numMethods];
+        for (int i = 0; i < numMethods; i++) {
+            JNINativeMethod gTypefaceMethod = gMethods[i];
+            string newName = string(gTypefaceMethod.name) + "_Original";
+            gTypefaceDelegateMethods[i].name = strdup(newName.c_str());
+            gTypefaceDelegateMethods[i].signature = gTypefaceMethod.signature;
+            gTypefaceDelegateMethods[i].fnPtr = gTypefaceMethod.fnPtr;
+        }
+        int result = env->RegisterNatives(clazz, gTypefaceDelegateMethods, numMethods);
+        for (int i = 0; i < numMethods; i++) {
+            free((char*)gTypefaceDelegateMethods[i].name);
+        }
+        return result;
+    }
+
+    jclass clazz = env->FindClass(className);
+
+    return env->RegisterNatives(clazz, gMethods, numMethods);
+}
+
+JNIEnv* AndroidRuntime::getJNIEnv()
+{
+    JNIEnv* env;
+    if (javaVM->GetEnv((void**) &env, JNI_VERSION_1_6) != JNI_OK)
+        return nullptr;
+    return env;
+}
+
+JavaVM* AndroidRuntime::getJavaVM() {
+    return javaVM;
+}
+
+} // namespace android
+
+using namespace android;
+
+JNIEXPORT jint JNI_OnLoad(JavaVM* vm, void*) {
+    javaVM = vm;
+    JNIEnv* env = nullptr;
+    if (vm->GetEnv(reinterpret_cast<void**>(&env), JNI_VERSION_1_6) != JNI_OK) {
+        return JNI_ERR;
+    }
+
+    // Get the names of classes that have to delegate their native methods
+    jclass createInfo = FindClassOrDie(env, "com/android/tools/layoutlib/create/CreateInfo");
+    jfieldID arrayId = GetStaticFieldIDOrDie(env, createInfo,
+            "DELEGATE_CLASS_NATIVES_TO_NATIVES", "[Ljava/lang/String;");
+    jobjectArray array = (jobjectArray) env->GetStaticObjectField(createInfo, arrayId);
+    jsize size = env->GetArrayLength(array);
+
+    for (int i=0; i < size; ++i) {
+        jstring string = (jstring) env->GetObjectArrayElement(array, i);
+        const char* charArray = env->GetStringUTFChars(string, 0);
+        std::string className = std::string(charArray);
+        std::replace(className.begin(), className.end(), '.', '/');
+        classesToDelegate.push_back(className);
+        env->ReleaseStringUTFChars(string, charArray);
+    }
+
+    if (register_jni_procs(gRegJNI, NELEM(gRegJNI), env) < 0) {
+        return JNI_ERR;
+    }
+
+    // Set the location of ICU data
+    jclass bridge = FindClassOrDie(env, "com/android/layoutlib/bridge/Bridge");
+    jstring stringPath = (jstring) env->CallStaticObjectMethod(bridge,
+            GetStaticMethodIDOrDie(env, bridge, "getIcuDataPath", "()Ljava/lang/String;"));
+    const char* path = env->GetStringUTFChars(stringPath, 0);
+    u_setDataDirectory(path);
+    env->ReleaseStringUTFChars(stringPath, path);
+    return JNI_VERSION_1_6;
+}