Add transform matrix to InputWindowHandle.

Added the transform matrix from WindowInfo native to the Java side
InputWindowHandle. This is to allow clients that register a
WindowInfoListener to translate the window's screen coordinates to
window space.

Test: Transform is now sent to WindowInfoListener
Bug: 188792659
Change-Id: Ifba8488ff470d3c6c8066e23b871c3d541cff0a1

core/java/android/view/InputWindowHandle.java

@@ -19,6 +19,7 @@ package android.view;
 import static android.view.Display.INVALID_DISPLAY;
 
 import android.annotation.Nullable;
+import android.graphics.Matrix;
 import android.graphics.Region;
 import android.gui.TouchOcclusionMode;
 import android.os.IBinder;
@@ -122,6 +123,12 @@ public final class InputWindowHandle {
      */
     public boolean replaceTouchableRegionWithCrop;
 
+    /**
+     * The transform that should be applied to the Window to get it from screen coordinates to
+     * window coordinates
+     */
+    public Matrix transform;
+
     private native void nativeDispose();
 
     public InputWindowHandle(InputApplicationHandle inputApplicationHandle, int displayId) {
@@ -136,6 +143,8 @@ public final class InputWindowHandle {
                         .append(frameRight).append(",").append(frameBottom).append("]")
                 .append(", touchableRegion=").append(touchableRegion)
                 .append(", visible=").append(visible)
+                .append(", scaleFactor=").append(scaleFactor)
+                .append(", transform=").append(transform)
                 .toString();
 
     }

core/jni/android_hardware_input_InputWindowHandle.cpp

@@ -26,6 +26,7 @@
 #include <ui/Region.h>
 #include <utils/threads.h>
 
+#include <android/graphics/matrix.h>
 #include <gui/WindowInfo.h>
 #include "SkRegion.h"
 #include "android_hardware_input_InputApplicationHandle.h"
@@ -74,6 +75,7 @@ static struct {
     jfieldID displayId;
     jfieldID replaceTouchableRegionWithCrop;
     WeakRefHandleField touchableRegionSurfaceControl;
+    jfieldID transform;
 } gInputWindowHandleClassInfo;
 
 static struct {
@@ -305,6 +307,13 @@ jobject android_view_InputWindowHandle_fromWindowInfo(JNIEnv* env, gui::WindowIn
     env->SetIntField(inputWindowHandle, gInputWindowHandleClassInfo.inputFeatures,
                      static_cast<int32_t>(windowInfo.inputFeatures.get()));
 
+    float transformVals[9];
+    for (int i = 0; i < 9; i++) {
+        transformVals[i] = windowInfo.transform[i % 3][i / 3];
+    }
+    ScopedLocalRef<jobject> matrixObj(env, AMatrix_newInstance(env, transformVals));
+    env->SetObjectField(inputWindowHandle, gInputWindowHandleClassInfo.transform, matrixObj.get());
+
     return inputWindowHandle;
 }
 
@@ -429,6 +438,9 @@ int register_android_view_InputWindowHandle(JNIEnv* env) {
     GET_FIELD_ID(gInputWindowHandleClassInfo.replaceTouchableRegionWithCrop, clazz,
             "replaceTouchableRegionWithCrop", "Z");
 
+    GET_FIELD_ID(gInputWindowHandleClassInfo.transform, clazz, "transform",
+                 "Landroid/graphics/Matrix;");
+
     jclass weakRefClazz;
     FIND_CLASS(weakRefClazz, "java/lang/ref/Reference");
 

libs/hwui/apex/android_matrix.cpp

@@ -35,3 +35,10 @@ bool AMatrix_getContents(JNIEnv* env, jobject matrixObj, float values[9]) {
     }
     return false;
 }
+
+jobject AMatrix_newInstance(JNIEnv* env, float values[9]) {
+    jobject matrixObj = android::android_graphics_Matrix_newInstance(env);
+    SkMatrix* m = android::android_graphics_Matrix_getSkMatrix(env, matrixObj);
+    m->set9(values);
+    return matrixObj;
+}

libs/hwui/apex/include/android/graphics/matrix.h

@@ -34,6 +34,16 @@ __BEGIN_DECLS
  */
 ANDROID_API bool AMatrix_getContents(JNIEnv* env, jobject matrixObj, float values[9]);
 
+/**
+ * Returns a new Matrix jobject that contains the values passed in as initial values.
+ * @param values The 9 values of the 3x3 matrix in the following order.
+ *               values[0] = scaleX  values[1] = skewX   values[2] = transX
+ *               values[3] = skewY   values[4] = scaleY  values[5] = transY
+ *               values[6] = persp0  values[7] = persp1  values[8] = persp2
+ * @return The matrix jobject
+ */
+ANDROID_API jobject AMatrix_newInstance(JNIEnv* env, float values[9]);
+
 __END_DECLS
 
 #endif // ANDROID_GRAPHICS_MATRIX_H

libs/hwui/jni/android_graphics_Matrix.cpp

@@ -378,13 +378,17 @@ static const JNINativeMethod methods[] = {
     {"nEquals", "(JJ)Z", (void*) SkMatrixGlue::equals}
 };
 
+static jclass sClazz;
 static jfieldID sNativeInstanceField;
+static jmethodID sCtor;
 
 int register_android_graphics_Matrix(JNIEnv* env) {
     int result = RegisterMethodsOrDie(env, "android/graphics/Matrix", methods, NELEM(methods));
 
     jclass clazz = FindClassOrDie(env, "android/graphics/Matrix");
+    sClazz = MakeGlobalRefOrDie(env, clazz);
     sNativeInstanceField = GetFieldIDOrDie(env, clazz, "native_instance", "J");
+    sCtor = GetMethodIDOrDie(env, clazz, "<init>", "()V");
 
     return result;
 }
@@ -393,4 +397,7 @@ SkMatrix* android_graphics_Matrix_getSkMatrix(JNIEnv* env, jobject matrixObj) {
     return reinterpret_cast<SkMatrix*>(env->GetLongField(matrixObj, sNativeInstanceField));
 }
 
+jobject android_graphics_Matrix_newInstance(JNIEnv* env) {
+    return env->NewObject(sClazz, sCtor);
+}
 }

libs/hwui/jni/android_graphics_Matrix.h

@@ -25,6 +25,9 @@ namespace android {
 /* Gets the underlying SkMatrix from a Matrix object. */
 SkMatrix* android_graphics_Matrix_getSkMatrix(JNIEnv* env, jobject matrixObj);
 
+/* Creates a new Matrix java object. */
+jobject android_graphics_Matrix_newInstance(JNIEnv* env);
+
 } // namespace android
 
 #endif // _ANDROID_GRAPHICS_MATRIX_H_

libs/hwui/libhwui.map.txt

@@ -28,6 +28,7 @@ LIBHWUI {
     register_android_graphics_GraphicsStatsService;
     zygote_preload_graphics;
     AMatrix_getContents;
+    AMatrix_newInstance;
     APaint_createPaint;
     APaint_destroyPaint;
     APaint_setBlendMode;