LayoutLib: Support Region through delegates.
also finish supporting some clip operation
on the canvas.
Change-Id: I743b9e52a7aa6e9340506f1c904cc1cfbf3ff81f
diff --git a/bridge/src/android/graphics/Region_Delegate.java b/bridge/src/android/graphics/Region_Delegate.java
new file mode 100644
index 0000000..684bb90
--- /dev/null
+++ b/bridge/src/android/graphics/Region_Delegate.java
@@ -0,0 +1,306 @@
+/*
+ * Copyright (C) 2010 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.graphics;
+
+import com.android.layoutlib.bridge.Bridge;
+import com.android.layoutlib.bridge.impl.DelegateManager;
+
+import android.os.Parcel;
+
+import java.awt.Rectangle;
+import java.awt.Shape;
+import java.awt.geom.AffineTransform;
+import java.awt.geom.Area;
+import java.awt.geom.Rectangle2D;
+
+/**
+ * Delegate implementing the native methods of android.graphics.Region
+ *
+ * Through the layoutlib_create tool, the original native methods of Region have been replaced
+ * by calls to methods of the same name in this delegate class.
+ *
+ * This class behaves like the original native implementation, but in Java, keeping previously
+ * native data into its own objects and mapping them to int that are sent back and forth between
+ * it and the original Region class.
+ *
+ * This also serve as a base class for all Region delegate classes.
+ *
+ * @see DelegateManager
+ *
+ */
+public class Region_Delegate {
+
+ // ---- delegate manager ----
+ protected static final DelegateManager<Region_Delegate> sManager =
+ new DelegateManager<Region_Delegate>();
+
+ // ---- delegate helper data ----
+
+ // ---- delegate data ----
+ private Area mArea = new Area();
+
+ // ---- Public Helper methods ----
+
+ public static Region_Delegate getDelegate(int nativeShader) {
+ return sManager.getDelegate(nativeShader);
+ }
+
+ public Area getJavaArea() {
+ return mArea;
+ }
+
+ /**
+ * Combines two {@link Shape} into another one (actually an {@link Area}), according
+ * to the given {@link Region.Op}.
+ *
+ * If the Op is not one that combines two shapes, then this return null
+ *
+ * @param shape1 the firt shape to combine
+ * @param shape2 the 2nd shape to combine
+ * @param regionOp the operande for the combine
+ * @return a new area or null.
+ */
+ public static Area combineShapes(Shape shape1, Shape shape2, int regionOp) {
+ if (regionOp == Region.Op.DIFFERENCE.nativeInt) {
+ // result is always a new area.
+ Area result = new Area(shape1);
+ result.subtract(shape2 instanceof Area ? (Area) shape2 : new Area(shape2));
+ return result;
+
+ } else if (regionOp == Region.Op.INTERSECT.nativeInt) {
+ // result is always a new area.
+ Area result = new Area(shape1);
+ result.intersect(shape2 instanceof Area ? (Area) shape2 : new Area(shape2));
+ return result;
+
+ } else if (regionOp == Region.Op.UNION.nativeInt) {
+ // result is always a new area.
+ Area result = new Area(shape1);
+ result.add(shape2 instanceof Area ? (Area) shape2 : new Area(shape2));
+ return result;
+
+ } else if (regionOp == Region.Op.XOR.nativeInt) {
+ // result is always a new area.
+ Area result = new Area(shape1);
+ result.exclusiveOr(shape2 instanceof Area ? (Area) shape2 : new Area(shape2));
+
+ } else if (regionOp == Region.Op.REVERSE_DIFFERENCE.nativeInt) {
+ // result is always a new area.
+ Area result = new Area(shape2);
+ result.subtract(shape1 instanceof Area ? (Area) shape1 : new Area(shape1));
+ return result;
+ }
+
+ return null;
+ }
+
+ // ---- native methods ----
+
+ /*package*/ static int nativeConstructor() {
+ Region_Delegate newDelegate = new Region_Delegate();
+ return sManager.addDelegate(newDelegate);
+ }
+
+ /*package*/ static void nativeDestructor(int native_region) {
+ sManager.removeDelegate(native_region);
+ }
+
+ /*package*/ static boolean nativeSetRegion(int native_dst, int native_src) {
+ Region_Delegate dstRegion = sManager.getDelegate(native_dst);
+ if (dstRegion == null) {
+ return true;
+ }
+
+ Region_Delegate srcRegion = sManager.getDelegate(native_src);
+ if (srcRegion == null) {
+ return true;
+ }
+
+ dstRegion.mArea.reset();
+ dstRegion.mArea.add(srcRegion.mArea);
+
+ return true;
+ }
+
+ /*package*/ static boolean nativeSetRect(int native_dst,
+ int left, int top, int right, int bottom) {
+ Region_Delegate dstRegion = sManager.getDelegate(native_dst);
+ if (dstRegion == null) {
+ return true;
+ }
+
+ dstRegion.mArea = new Area(new Rectangle2D.Float(left, top, right - left, bottom - top));
+ return dstRegion.mArea.getBounds().isEmpty() == false;
+ }
+
+ /*package*/ static boolean nativeSetPath(int native_dst, int native_path, int native_clip) {
+ Region_Delegate dstRegion = sManager.getDelegate(native_dst);
+ if (dstRegion == null) {
+ return true;
+ }
+
+ Path_Delegate path = Path_Delegate.getDelegate(native_path);
+ if (path == null) {
+ return true;
+ }
+
+ dstRegion.mArea = new Area(path.getJavaShape());
+
+ Region_Delegate clip = sManager.getDelegate(native_clip);
+ if (clip != null) {
+ dstRegion.mArea.subtract(clip.getJavaArea());
+ }
+
+ return dstRegion.mArea.getBounds().isEmpty() == false;
+ }
+
+ /*package*/ static boolean nativeGetBounds(int native_region, Rect rect) {
+ Region_Delegate region = sManager.getDelegate(native_region);
+ if (region == null) {
+ return true;
+ }
+
+ Rectangle bounds = region.mArea.getBounds();
+ if (bounds.isEmpty()) {
+ rect.left = rect.top = rect.right = rect.bottom = 0;
+ return false;
+ }
+
+ rect.left = bounds.x;
+ rect.top = bounds.y;
+ rect.right = bounds.x + bounds.width;
+ rect.bottom = bounds.y + bounds.height;
+ return true;
+ }
+
+ /*package*/ static boolean nativeGetBoundaryPath(int native_region, int native_path) {
+ Region_Delegate region = sManager.getDelegate(native_region);
+ if (region == null) {
+ return false;
+ }
+
+ Path_Delegate path = Path_Delegate.getDelegate(native_path);
+ if (path == null) {
+ return false;
+ }
+
+ if (region.mArea.isEmpty()) {
+ path.reset();
+ return false;
+ }
+
+ path.setPathIterator(region.mArea.getPathIterator(new AffineTransform()));
+ return true;
+ }
+
+ /*package*/ static boolean nativeOp(int native_dst,
+ int left, int top, int right, int bottom, int op) {
+ Region_Delegate region = sManager.getDelegate(native_dst);
+ if (region == null) {
+ return false;
+ }
+
+ region.mArea = combineShapes(region.mArea,
+ new Rectangle2D.Float(left, top, right - left, bottom - top), op);
+
+ assert region.mArea != null;
+ if (region.mArea != null) {
+ region.mArea = new Area();
+ }
+
+ return region.mArea.getBounds().isEmpty() == false;
+ }
+
+ /*package*/ static boolean nativeOp(int native_dst, Rect rect, int native_region, int op) {
+ Region_Delegate region = sManager.getDelegate(native_dst);
+ if (region == null) {
+ return false;
+ }
+
+ region.mArea = combineShapes(region.mArea,
+ new Rectangle2D.Float(rect.left, rect.top, rect.width(), rect.height()), op);
+
+ assert region.mArea != null;
+ if (region.mArea != null) {
+ region.mArea = new Area();
+ }
+
+ return region.mArea.getBounds().isEmpty() == false;
+ }
+
+ /*package*/ static boolean nativeOp(int native_dst,
+ int native_region1, int native_region2, int op) {
+ Region_Delegate dstRegion = sManager.getDelegate(native_dst);
+ if (dstRegion == null) {
+ return true;
+ }
+
+ Region_Delegate region1 = sManager.getDelegate(native_region1);
+ if (region1 == null) {
+ return false;
+ }
+
+ Region_Delegate region2 = sManager.getDelegate(native_region2);
+ if (region2 == null) {
+ return false;
+ }
+
+ dstRegion.mArea = combineShapes(region1.mArea, region2.mArea, op);
+
+ assert dstRegion.mArea != null;
+ if (dstRegion.mArea != null) {
+ dstRegion.mArea = new Area();
+ }
+
+ return dstRegion.mArea.getBounds().isEmpty() == false;
+
+ }
+
+ /*package*/ static int nativeCreateFromParcel(Parcel p) {
+ // This is only called by Region.CREATOR (Parcelable.Creator<Region>), which is only
+ // used during aidl call so really this should not be called.
+ Bridge.getLog().error(null,
+ "AIDL is not suppored, and therefore Regions cannot be created from parcels.");
+ return 0;
+ }
+
+ /*package*/ static boolean nativeWriteToParcel(int native_region,
+ Parcel p) {
+ // This is only called when sending a region through aidl, so really this should not
+ // be called.
+ Bridge.getLog().error(null,
+ "AIDL is not suppored, and therefore Regions cannot be written to parcels.");
+ return false;
+ }
+
+ /*package*/ static boolean nativeEquals(int native_r1, int native_r2) {
+ Region_Delegate region1 = sManager.getDelegate(native_r1);
+ if (region1 == null) {
+ return false;
+ }
+
+ Region_Delegate region2 = sManager.getDelegate(native_r2);
+ if (region2 == null) {
+ return false;
+ }
+
+ return region1.mArea.equals(region2.mArea);
+ }
+
+ // ---- Private delegate/helper methods ----
+
+}