am 0b76cf6f: am 34751c79: Merge "Better shadows." into lmp-dev
* commit '0b76cf6ff56c59a04783714d40163576e3081cf1':
Better shadows.
diff --git a/tools/layoutlib/bridge/src/android/view/RectShadowPainter.java b/tools/layoutlib/bridge/src/android/view/RectShadowPainter.java
new file mode 100644
index 0000000..ec3a8d6
--- /dev/null
+++ b/tools/layoutlib/bridge/src/android/view/RectShadowPainter.java
@@ -0,0 +1,156 @@
+/*
+ * Copyright (C) 2015 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.view;
+
+import com.android.layoutlib.bridge.impl.ResourceHelper;
+
+import android.graphics.Canvas;
+import android.graphics.LinearGradient;
+import android.graphics.Outline;
+import android.graphics.Paint;
+import android.graphics.Paint.Style;
+import android.graphics.Path;
+import android.graphics.Path.FillType;
+import android.graphics.RadialGradient;
+import android.graphics.Rect;
+import android.graphics.RectF;
+import android.graphics.Region.Op;
+import android.graphics.Shader.TileMode;
+
+/**
+ * Paints shadow for rounded rectangles. Inspiration from CardView. Couldn't use that directly,
+ * since it modifies the size of the content, that we can't do.
+ */
+public class RectShadowPainter {
+
+
+ private static final int START_COLOR = ResourceHelper.getColor("#37000000");
+ private static final int END_COLOR = ResourceHelper.getColor("#03000000");
+ private static final float PERPENDICULAR_ANGLE = 90f;
+
+ public static void paintShadow(Outline viewOutline, float elevation, Canvas canvas) {
+ float shadowSize = elevationToShadow(elevation);
+ int saved = modifyCanvas(canvas, shadowSize);
+ if (saved == -1) {
+ return;
+ }
+ try {
+ Paint cornerPaint = new Paint(Paint.ANTI_ALIAS_FLAG | Paint.DITHER_FLAG);
+ cornerPaint.setStyle(Style.FILL);
+ Paint edgePaint = new Paint(cornerPaint);
+ edgePaint.setAntiAlias(false);
+ Rect outline = viewOutline.mRect;
+ float radius = viewOutline.mRadius;
+ float outerArcRadius = radius + shadowSize;
+ int[] colors = {START_COLOR, START_COLOR, END_COLOR};
+ cornerPaint.setShader(new RadialGradient(0, 0, outerArcRadius, colors,
+ new float[]{0f, radius / outerArcRadius, 1f}, TileMode.CLAMP));
+ edgePaint.setShader(new LinearGradient(0, 0, -shadowSize, 0, START_COLOR, END_COLOR,
+ TileMode.CLAMP));
+ Path path = new Path();
+ path.setFillType(FillType.EVEN_ODD);
+ // A rectangle bounding the complete shadow.
+ RectF shadowRect = new RectF(outline);
+ shadowRect.inset(-shadowSize, -shadowSize);
+ // A rectangle with edges corresponding to the straight edges of the outline.
+ RectF inset = new RectF(outline);
+ inset.inset(radius, radius);
+ // A rectangle used to represent the edge shadow.
+ RectF edgeShadowRect = new RectF();
+
+
+ // left and right sides.
+ edgeShadowRect.set(-shadowSize, 0f, 0f, inset.height());
+ // Left shadow
+ sideShadow(canvas, edgePaint, edgeShadowRect, outline.left, inset.top, 0);
+ // Right shadow
+ sideShadow(canvas, edgePaint, edgeShadowRect, outline.right, inset.bottom, 2);
+ // Top shadow
+ edgeShadowRect.set(-shadowSize, 0, 0, inset.width());
+ sideShadow(canvas, edgePaint, edgeShadowRect, inset.right, outline.top, 1);
+ // bottom shadow. This needs an inset so that blank doesn't appear when the content is
+ // moved up.
+ edgeShadowRect.set(-shadowSize, 0, shadowSize / 2f, inset.width());
+ edgePaint.setShader(new LinearGradient(edgeShadowRect.right, 0, edgeShadowRect.left, 0,
+ colors, new float[]{0f, 1 / 3f, 1f}, TileMode.CLAMP));
+ sideShadow(canvas, edgePaint, edgeShadowRect, inset.left, outline.bottom, 3);
+
+ // Draw corners.
+ drawCorner(canvas, cornerPaint, path, inset.right, inset.bottom, outerArcRadius, 0);
+ drawCorner(canvas, cornerPaint, path, inset.left, inset.bottom, outerArcRadius, 1);
+ drawCorner(canvas, cornerPaint, path, inset.left, inset.top, outerArcRadius, 2);
+ drawCorner(canvas, cornerPaint, path, inset.right, inset.top, outerArcRadius, 3);
+ } finally {
+ canvas.restoreToCount(saved);
+ }
+ }
+
+ private static float elevationToShadow(float elevation) {
+ // The factor is chosen by eyeballing the shadow size on device and preview.
+ return elevation * 0.5f;
+ }
+
+ /**
+ * Translate canvas by half of shadow size up, so that it appears that light is coming
+ * slightly from above. Also, remove clipping, so that shadow is not clipped.
+ */
+ private static int modifyCanvas(Canvas canvas, float shadowSize) {
+ Rect clipBounds = canvas.getClipBounds();
+ if (clipBounds.isEmpty()) {
+ return -1;
+ }
+ int saved = canvas.save();
+ // Usually canvas has been translated to the top left corner of the view when this is
+ // called. So, setting a clip rect at 0,0 will clip the top left part of the shadow.
+ // Thus, we just expand in each direction by width and height of the canvas.
+ canvas.clipRect(-canvas.getWidth(), -canvas.getHeight(), canvas.getWidth(),
+ canvas.getHeight(), Op.REPLACE);
+ canvas.translate(0, shadowSize / 2f);
+ return saved;
+ }
+
+ private static void sideShadow(Canvas canvas, Paint edgePaint,
+ RectF edgeShadowRect, float dx, float dy, int rotations) {
+ int saved = canvas.save();
+ canvas.translate(dx, dy);
+ canvas.rotate(rotations * PERPENDICULAR_ANGLE);
+ canvas.drawRect(edgeShadowRect, edgePaint);
+ canvas.restoreToCount(saved);
+ }
+
+ /**
+ * @param canvas Canvas to draw the rectangle on.
+ * @param paint Paint to use when drawing the corner.
+ * @param path A path to reuse. Prevents allocating memory for each path.
+ * @param x Center of circle, which this corner is a part of.
+ * @param y Center of circle, which this corner is a part of.
+ * @param radius radius of the arc
+ * @param rotations number of quarter rotations before starting to paint the arc.
+ */
+ private static void drawCorner(Canvas canvas, Paint paint, Path path, float x, float y,
+ float radius, int rotations) {
+ int saved = canvas.save();
+ canvas.translate(x, y);
+ path.reset();
+ path.arcTo(-radius, -radius, radius, radius, rotations * PERPENDICULAR_ANGLE,
+ PERPENDICULAR_ANGLE, false);
+ path.lineTo(0, 0);
+ path.close();
+ canvas.drawPath(path, paint);
+ canvas.restoreToCount(saved);
+ }
+}
diff --git a/tools/layoutlib/bridge/src/android/view/ViewGroup_Delegate.java b/tools/layoutlib/bridge/src/android/view/ViewGroup_Delegate.java
index 82ae1df..e72a0db 100644
--- a/tools/layoutlib/bridge/src/android/view/ViewGroup_Delegate.java
+++ b/tools/layoutlib/bridge/src/android/view/ViewGroup_Delegate.java
@@ -16,12 +16,9 @@
package android.view;
-import com.android.annotations.NonNull;
-import com.android.layoutlib.bridge.android.BridgeContext;
import com.android.resources.Density;
import com.android.tools.layoutlib.annotations.LayoutlibDelegate;
-import android.content.Context;
import android.graphics.Bitmap;
import android.graphics.Bitmap_Delegate;
import android.graphics.Canvas;
@@ -29,8 +26,6 @@
import android.graphics.Path_Delegate;
import android.graphics.Rect;
import android.graphics.Region.Op;
-import android.util.DisplayMetrics;
-import android.util.TypedValue;
import android.view.animation.Transformation;
import java.awt.Graphics2D;
@@ -50,33 +45,36 @@
@LayoutlibDelegate
/*package*/ static boolean drawChild(ViewGroup thisVG, Canvas canvas, View child,
long drawingTime) {
- boolean retVal = thisVG.drawChild_Original(canvas, child, drawingTime);
if (child.getZ() > thisVG.getZ()) {
ViewOutlineProvider outlineProvider = child.getOutlineProvider();
Outline outline = new Outline();
outlineProvider.getOutline(child, outline);
-
+ if (outline.mPath == null && outline.mRect == null) {
+ // Sometimes, the bounds of the background drawable are not set until View.draw()
+ // is called. So, we set the bounds manually and try to get the outline again.
+ child.getBackground().setBounds(0, 0, child.mRight - child.mLeft,
+ child.mBottom - child.mTop);
+ outlineProvider.getOutline(child, outline);
+ }
if (outline.mPath != null || (outline.mRect != null && !outline.mRect.isEmpty())) {
int restoreTo = transformCanvas(thisVG, canvas, child);
drawShadow(thisVG, canvas, child, outline);
canvas.restoreToCount(restoreTo);
}
}
- return retVal;
+ return thisVG.drawChild_Original(canvas, child, drawingTime);
}
private static void drawShadow(ViewGroup parent, Canvas canvas, View child,
Outline outline) {
+ float elevation = getElevation(child, parent);
+ if(outline.mRect != null) {
+ RectShadowPainter.paintShadow(outline, elevation, canvas);
+ return;
+ }
BufferedImage shadow = null;
- int x = 0;
- if (outline.mRect != null) {
- Shadow s = getRectShadow(parent, canvas, child, outline);
- if (s != null) {
- shadow = s.mShadow;
- x = -s.mShadowWidth;
- }
- } else if (outline.mPath != null) {
- shadow = getPathShadow(child, outline, canvas);
+ if (outline.mPath != null) {
+ shadow = getPathShadow(outline, canvas, elevation);
}
if (shadow == null) {
return;
@@ -85,52 +83,17 @@
Density.getEnum(canvas.getDensity()));
Rect clipBounds = canvas.getClipBounds();
Rect newBounds = new Rect(clipBounds);
- newBounds.left = newBounds.left + x;
+ newBounds.inset((int)-elevation, (int)-elevation);
canvas.clipRect(newBounds, Op.REPLACE);
- canvas.drawBitmap(bitmap, x, 0, null);
+ canvas.drawBitmap(bitmap, 0, 0, null);
canvas.clipRect(clipBounds, Op.REPLACE);
}
- private static Shadow getRectShadow(ViewGroup parent, Canvas canvas, View child,
- Outline outline) {
- BufferedImage shadow;
- Rect clipBounds = canvas.getClipBounds();
- if (clipBounds.isEmpty()) {
- return null;
- }
- float height = child.getZ() - parent.getZ();
- // Draw large shadow if difference in z index is more than 10dp
- float largeShadowThreshold = TypedValue.applyDimension(TypedValue.COMPLEX_UNIT_DIP, 10f,
- getMetrics(child));
- boolean largeShadow = height > largeShadowThreshold;
- int shadowSize = largeShadow ? ShadowPainter.SHADOW_SIZE : ShadowPainter.SMALL_SHADOW_SIZE;
- shadow = new BufferedImage(clipBounds.width() + shadowSize, clipBounds.height(),
- BufferedImage.TYPE_INT_ARGB);
- Graphics2D graphics = shadow.createGraphics();
- Rect rect = outline.mRect;
- if (largeShadow) {
- ShadowPainter.drawRectangleShadow(graphics,
- rect.left + shadowSize, rect.top, rect.width(), rect.height());
- } else {
- ShadowPainter.drawSmallRectangleShadow(graphics,
- rect.left + shadowSize, rect.top, rect.width(), rect.height());
- }
- graphics.dispose();
- return new Shadow(shadow, shadowSize);
+ private static float getElevation(View child, ViewGroup parent) {
+ return child.getZ() - parent.getZ();
}
- @NonNull
- private static DisplayMetrics getMetrics(View view) {
- Context context = view.getContext();
- context = BridgeContext.getBaseContext(context);
- if (context instanceof BridgeContext) {
- return ((BridgeContext) context).getMetrics();
- }
- throw new RuntimeException("View " + view.getClass().getName() + " not created with the " +
- "right context");
- }
-
- private static BufferedImage getPathShadow(View child, Outline outline, Canvas canvas) {
+ private static BufferedImage getPathShadow(Outline outline, Canvas canvas, float elevation) {
Rect clipBounds = canvas.getClipBounds();
if (clipBounds.isEmpty()) {
return null;
@@ -140,7 +103,7 @@
Graphics2D graphics = image.createGraphics();
graphics.draw(Path_Delegate.getDelegate(outline.mPath.mNativePath).getJavaShape());
graphics.dispose();
- return ShadowPainter.createDropShadow(image, ((int) child.getZ()));
+ return ShadowPainter.createDropShadow(image, (int) elevation);
}
// Copied from android.view.View#draw(Canvas, ViewGroup, long) and removed code paths
@@ -194,15 +157,4 @@
}
return restoreTo;
}
-
- private static class Shadow {
- public BufferedImage mShadow;
- public int mShadowWidth;
-
- public Shadow(BufferedImage shadow, int shadowWidth) {
- mShadow = shadow;
- mShadowWidth = shadowWidth;
- }
-
- }
}