Revert "Support alpha for SurfaceView"
Revert submission 19562144-surfaceview-alpha
Reason for revert: Presubmit breakage b/245651921
Reverted Changes:
I7510a3a6c:Add CTS for applying alpha for SurfaceView
Ibc14b18f1:Support alpha for SurfaceView
Change-Id: I498c98951a53e6bb1c1251dceb9d150311b07cc8
diff --git a/core/java/android/view/SurfaceView.java b/core/java/android/view/SurfaceView.java
index 586c193..b6c92e3 100644
--- a/core/java/android/view/SurfaceView.java
+++ b/core/java/android/view/SurfaceView.java
@@ -107,14 +107,6 @@
* and scaling a SurfaceView on screen will not cause rendering artifacts. Such
* artifacts may occur on previous versions of the platform when its window is
* positioned asynchronously.</p>
- *
- * <p class="note"><strong>Note:</strong> Starting in platform version
- * {@link android.os.Build.VERSION_CODES#UPSIDE_DOWN_CAKE}, SurfaceView will support arbitrary
- * alpha blending. Prior platform versions ignored alpha values on the SurfaceView if they were
- * between 0 and 1. If the SurfaceView is configured with Z-above, then the alpha is applied
- * directly to the Surface. If the SurfaceView is configured with Z-below, then the alpha is
- * applied to the hole punch directly. Note that when using Z-below, overlapping SurfaceViews
- * may not blend properly as a consequence of not applying alpha to the surface content directly.
*/
public class SurfaceView extends View implements ViewRootImpl.SurfaceChangedCallback {
private static final String TAG = "SurfaceView";
@@ -154,7 +146,6 @@
Paint mRoundedViewportPaint;
int mSubLayer = APPLICATION_MEDIA_SUBLAYER;
- int mRequestedSubLayer = APPLICATION_MEDIA_SUBLAYER;
@UnsupportedAppUsage(maxTargetSdk = Build.VERSION_CODES.P, trackingBug = 115609023)
boolean mIsCreating = false;
@@ -186,7 +177,8 @@
@UnsupportedAppUsage
int mRequestedFormat = PixelFormat.RGB_565;
- float mAlpha = 1f;
+ boolean mUseAlpha = false;
+ float mSurfaceAlpha = 1f;
boolean mClipSurfaceToBounds;
int mBackgroundColor = Color.BLACK;
@@ -343,25 +335,58 @@
* @hide
*/
public void setUseAlpha() {
- // TODO(b/241474646): Remove me
- return;
+ if (!mUseAlpha) {
+ mUseAlpha = true;
+ updateSurfaceAlpha();
+ }
}
@Override
public void setAlpha(float alpha) {
+ // Sets the opacity of the view to a value, where 0 means the view is completely transparent
+ // and 1 means the view is completely opaque.
+ //
+ // Note: Alpha value of this view is ignored by default. To enable alpha blending, you need
+ // to call setUseAlpha() as well.
+ // This view doesn't support translucent opacity if the view is located z-below, since the
+ // logic to punch a hole in the view hierarchy cannot handle such case. See also
+ // #clearSurfaceViewPort(Canvas)
if (DEBUG) {
Log.d(TAG, System.identityHashCode(this)
- + " setAlpha: alpha=" + alpha);
+ + " setAlpha: mUseAlpha = " + mUseAlpha + " alpha=" + alpha);
}
super.setAlpha(alpha);
+ updateSurfaceAlpha();
}
- @Override
- protected boolean onSetAlpha(int alpha) {
- if (Math.round(mAlpha * 255) != alpha) {
- updateSurface();
+ private float getFixedAlpha() {
+ // Compute alpha value to be set on the underlying surface.
+ final float alpha = getAlpha();
+ return mUseAlpha && (mSubLayer > 0 || alpha == 0f) ? alpha : 1f;
+ }
+
+ private void updateSurfaceAlpha() {
+ if (!mUseAlpha || !mHaveFrame || mSurfaceControl == null) {
+ return;
}
- return true;
+ final float viewAlpha = getAlpha();
+ if (mSubLayer < 0 && 0f < viewAlpha && viewAlpha < 1f) {
+ Log.w(TAG, System.identityHashCode(this)
+ + " updateSurfaceAlpha:"
+ + " translucent color is not supported for a surface placed z-below.");
+ }
+ final ViewRootImpl viewRoot = getViewRootImpl();
+ if (viewRoot == null) {
+ return;
+ }
+ final float alpha = getFixedAlpha();
+ if (alpha != mSurfaceAlpha) {
+ final Transaction transaction = new Transaction();
+ transaction.setAlpha(mSurfaceControl, alpha);
+ viewRoot.applyTransactionOnDraw(transaction);
+ damageInParent();
+ mSurfaceAlpha = alpha;
+ }
}
private void performDrawFinished() {
@@ -509,15 +534,7 @@
invalidate();
}
- @Override
- public boolean hasOverlappingRendering() {
- // SurfaceViews only alpha composite by modulating the Surface alpha for Z-above, or
- // applying alpha on the hole punch for Z-below - no deferral to a layer is necessary.
- return false;
- }
-
private void clearSurfaceViewPort(Canvas canvas) {
- final float alpha = getAlpha();
if (mCornerRadius > 0f) {
canvas.getClipBounds(mTmpRect);
if (mClipSurfaceToBounds && mClipBounds != null) {
@@ -529,11 +546,10 @@
mTmpRect.right,
mTmpRect.bottom,
mCornerRadius,
- mCornerRadius,
- alpha
+ mCornerRadius
);
} else {
- canvas.punchHole(0f, 0f, getWidth(), getHeight(), 0f, 0f, alpha);
+ canvas.punchHole(0f, 0f, getWidth(), getHeight(), 0f, 0f);
}
}
@@ -636,10 +652,10 @@
} else {
subLayer = APPLICATION_MEDIA_SUBLAYER;
}
- if (mRequestedSubLayer == subLayer) {
+ if (mSubLayer == subLayer) {
return false;
}
- mRequestedSubLayer = subLayer;
+ mSubLayer = subLayer;
if (!allowDynamicChange) {
return false;
@@ -651,8 +667,9 @@
if (viewRoot == null) {
return true;
}
-
- updateSurface();
+ final Transaction transaction = new SurfaceControl.Transaction();
+ updateRelativeZ(transaction);
+ viewRoot.applyTransactionOnDraw(transaction);
invalidate();
return true;
}
@@ -705,7 +722,8 @@
}
private void releaseSurfaces(boolean releaseSurfacePackage) {
- mAlpha = 1f;
+ mSurfaceAlpha = 1f;
+
synchronized (mSurfaceControlLock) {
mSurface.destroy();
if (mBlastBufferQueue != null) {
@@ -752,7 +770,7 @@
}
private boolean performSurfaceTransaction(ViewRootImpl viewRoot, Translator translator,
- boolean creating, boolean sizeChanged, boolean hintChanged, boolean relativeZChanged,
+ boolean creating, boolean sizeChanged, boolean hintChanged,
Transaction surfaceUpdateTransaction) {
boolean realSizeChanged = false;
@@ -782,20 +800,14 @@
surfaceUpdateTransaction.hide(mSurfaceControl);
}
+
+
updateBackgroundVisibility(surfaceUpdateTransaction);
updateBackgroundColor(surfaceUpdateTransaction);
- if (isAboveParent()) {
- float alpha = getAlpha();
+ if (mUseAlpha) {
+ float alpha = getFixedAlpha();
surfaceUpdateTransaction.setAlpha(mSurfaceControl, alpha);
- }
-
- if (relativeZChanged) {
- if (!isAboveParent()) {
- // If we're moving from z-above to z-below, then restore the surface alpha back to 1
- // and let the holepunch drive visibility and blending.
- surfaceUpdateTransaction.setAlpha(mSurfaceControl, 1.f);
- }
- updateRelativeZ(surfaceUpdateTransaction);
+ mSurfaceAlpha = alpha;
}
surfaceUpdateTransaction.setCornerRadius(mSurfaceControl, mCornerRadius);
@@ -861,7 +873,6 @@
} finally {
mSurfaceLock.unlock();
}
-
return realSizeChanged;
}
@@ -895,10 +906,10 @@
int myHeight = mRequestedHeight;
if (myHeight <= 0) myHeight = getHeight();
- final float alpha = getAlpha();
+ final float alpha = getFixedAlpha();
final boolean formatChanged = mFormat != mRequestedFormat;
final boolean visibleChanged = mVisible != mRequestedVisible;
- final boolean alphaChanged = mAlpha != alpha;
+ final boolean alphaChanged = mSurfaceAlpha != alpha;
final boolean creating = (mSurfaceControl == null || formatChanged || visibleChanged)
&& mRequestedVisible;
final boolean sizeChanged = mSurfaceWidth != myWidth || mSurfaceHeight != myHeight;
@@ -910,17 +921,17 @@
|| getHeight() != mScreenRect.height();
final boolean hintChanged = (viewRoot.getBufferTransformHint() != mTransformHint)
&& mRequestedVisible;
- final boolean relativeZChanged = mSubLayer != mRequestedSubLayer;
- if (creating || formatChanged || sizeChanged || visibleChanged
- || alphaChanged || windowVisibleChanged || positionChanged
- || layoutSizeChanged || hintChanged || relativeZChanged) {
+ if (creating || formatChanged || sizeChanged || visibleChanged ||
+ (mUseAlpha && alphaChanged) || windowVisibleChanged ||
+ positionChanged || layoutSizeChanged || hintChanged) {
if (DEBUG) Log.i(TAG, System.identityHashCode(this) + " "
+ "Changes: creating=" + creating
+ " format=" + formatChanged + " size=" + sizeChanged
+ " visible=" + visibleChanged + " alpha=" + alphaChanged
+ " hint=" + hintChanged
+ + " mUseAlpha=" + mUseAlpha
+ " visible=" + visibleChanged
+ " left=" + (mWindowSpaceLeft != mLocation[0])
+ " top=" + (mWindowSpaceTop != mLocation[1]));
@@ -932,10 +943,8 @@
mSurfaceWidth = myWidth;
mSurfaceHeight = myHeight;
mFormat = mRequestedFormat;
- mAlpha = alpha;
mLastWindowVisibility = mWindowVisibility;
mTransformHint = viewRoot.getBufferTransformHint();
- mSubLayer = mRequestedSubLayer;
mScreenRect.left = mWindowSpaceLeft;
mScreenRect.top = mWindowSpaceTop;
@@ -959,7 +968,7 @@
}
final boolean redrawNeeded = sizeChanged || creating || hintChanged
- || (mVisible && !mDrawFinished) || alphaChanged || relativeZChanged;
+ || (mVisible && !mDrawFinished);
boolean shouldSyncBuffer =
redrawNeeded && viewRoot.wasRelayoutRequested() && viewRoot.isInLocalSync();
SyncBufferTransactionCallback syncBufferTransactionCallback = null;
@@ -970,9 +979,8 @@
syncBufferTransactionCallback::onTransactionReady);
}
- final boolean realSizeChanged = performSurfaceTransaction(viewRoot, translator,
- creating, sizeChanged, hintChanged, relativeZChanged,
- surfaceUpdateTransaction);
+ final boolean realSizeChanged = performSurfaceTransaction(viewRoot,
+ translator, creating, sizeChanged, hintChanged, surfaceUpdateTransaction);
try {
SurfaceHolder.Callback[] callbacks = null;
diff --git a/graphics/java/android/graphics/BaseCanvas.java b/graphics/java/android/graphics/BaseCanvas.java
index 54d6428..a8ab6d9 100644
--- a/graphics/java/android/graphics/BaseCanvas.java
+++ b/graphics/java/android/graphics/BaseCanvas.java
@@ -670,9 +670,8 @@
/**
* @hide
*/
- public void punchHole(float left, float top, float right, float bottom, float rx, float ry,
- float alpha) {
- nPunchHole(mNativeCanvasWrapper, left, top, right, bottom, rx, ry, alpha);
+ public void punchHole(float left, float top, float right, float bottom, float rx, float ry) {
+ nPunchHole(mNativeCanvasWrapper, left, top, right, bottom, rx, ry);
}
/**
@@ -824,5 +823,5 @@
float hOffset, float vOffset, int flags, long nativePaint);
private static native void nPunchHole(long renderer, float left, float top, float right,
- float bottom, float rx, float ry, float alpha);
+ float bottom, float rx, float ry);
}
diff --git a/graphics/java/android/graphics/BaseRecordingCanvas.java b/graphics/java/android/graphics/BaseRecordingCanvas.java
index 1ba79b8..d06f665 100644
--- a/graphics/java/android/graphics/BaseRecordingCanvas.java
+++ b/graphics/java/android/graphics/BaseRecordingCanvas.java
@@ -610,9 +610,8 @@
* @hide
*/
@Override
- public void punchHole(float left, float top, float right, float bottom, float rx, float ry,
- float alpha) {
- nPunchHole(mNativeCanvasWrapper, left, top, right, bottom, rx, ry, alpha);
+ public void punchHole(float left, float top, float right, float bottom, float rx, float ry) {
+ nPunchHole(mNativeCanvasWrapper, left, top, right, bottom, rx, ry);
}
@FastNative
@@ -743,5 +742,5 @@
@FastNative
private static native void nPunchHole(long renderer, float left, float top, float right,
- float bottom, float rx, float ry, float alpha);
+ float bottom, float rx, float ry);
}
diff --git a/libs/hwui/SkiaCanvas.cpp b/libs/hwui/SkiaCanvas.cpp
index 20c6d68..023d6bf 100644
--- a/libs/hwui/SkiaCanvas.cpp
+++ b/libs/hwui/SkiaCanvas.cpp
@@ -18,7 +18,6 @@
#include "CanvasProperty.h"
#include "NinePatchUtils.h"
-#include "SkBlendMode.h"
#include "VectorDrawable.h"
#include "hwui/Bitmap.h"
#include "hwui/MinikinUtils.h"
@@ -252,11 +251,10 @@
return (rec && rec->saveCount == currentSaveCount) ? rec : nullptr;
}
-void SkiaCanvas::punchHole(const SkRRect& rect, float alpha) {
+void SkiaCanvas::punchHole(const SkRRect& rect) {
SkPaint paint = SkPaint();
- paint.setColor(SkColors::kBlack);
- paint.setAlphaf(alpha);
- paint.setBlendMode(SkBlendMode::kDstOut);
+ paint.setColor(0);
+ paint.setBlendMode(SkBlendMode::kClear);
mCanvas->drawRRect(rect, paint);
}
diff --git a/libs/hwui/SkiaCanvas.h b/libs/hwui/SkiaCanvas.h
index 51007c5..c6313f6 100644
--- a/libs/hwui/SkiaCanvas.h
+++ b/libs/hwui/SkiaCanvas.h
@@ -65,7 +65,7 @@
LOG_ALWAYS_FATAL("SkiaCanvas does not support enableZ");
}
- virtual void punchHole(const SkRRect& rect, float alpha) override;
+ virtual void punchHole(const SkRRect& rect) override;
virtual void setBitmap(const SkBitmap& bitmap) override;
diff --git a/libs/hwui/hwui/Canvas.h b/libs/hwui/hwui/Canvas.h
index 82d23b5..7378351 100644
--- a/libs/hwui/hwui/Canvas.h
+++ b/libs/hwui/hwui/Canvas.h
@@ -152,7 +152,7 @@
LOG_ALWAYS_FATAL("Not supported");
}
- virtual void punchHole(const SkRRect& rect, float alpha) = 0;
+ virtual void punchHole(const SkRRect& rect) = 0;
// ----------------------------------------------------------------------------
// Canvas state operations
diff --git a/libs/hwui/jni/android_graphics_Canvas.cpp b/libs/hwui/jni/android_graphics_Canvas.cpp
index 0513447..fb7d5f7 100644
--- a/libs/hwui/jni/android_graphics_Canvas.cpp
+++ b/libs/hwui/jni/android_graphics_Canvas.cpp
@@ -713,10 +713,9 @@
}
static void punchHole(JNIEnv* env, jobject, jlong canvasPtr, jfloat left, jfloat top, jfloat right,
- jfloat bottom, jfloat rx, jfloat ry, jfloat alpha) {
+ jfloat bottom, jfloat rx, jfloat ry) {
auto canvas = reinterpret_cast<Canvas*>(canvasPtr);
- canvas->punchHole(SkRRect::MakeRectXY(SkRect::MakeLTRB(left, top, right, bottom), rx, ry),
- alpha);
+ canvas->punchHole(SkRRect::MakeRectXY(SkRect::MakeLTRB(left, top, right, bottom), rx, ry));
}
}; // namespace CanvasJNI
@@ -791,7 +790,7 @@
{"nDrawTextRun","(JLjava/lang/String;IIIIFFZJ)V", (void*) CanvasJNI::drawTextRunString},
{"nDrawTextOnPath","(J[CIIJFFIJ)V", (void*) CanvasJNI::drawTextOnPathChars},
{"nDrawTextOnPath","(JLjava/lang/String;JFFIJ)V", (void*) CanvasJNI::drawTextOnPathString},
- {"nPunchHole", "(JFFFFFFF)V", (void*) CanvasJNI::punchHole}
+ {"nPunchHole", "(JFFFFFF)V", (void*) CanvasJNI::punchHole}
};
int register_android_graphics_Canvas(JNIEnv* env) {
diff --git a/libs/hwui/pipeline/skia/RenderNodeDrawable.cpp b/libs/hwui/pipeline/skia/RenderNodeDrawable.cpp
index f2282e66..3bf2b2e 100644
--- a/libs/hwui/pipeline/skia/RenderNodeDrawable.cpp
+++ b/libs/hwui/pipeline/skia/RenderNodeDrawable.cpp
@@ -201,7 +201,6 @@
paint.setAlpha((uint8_t)paint.getAlpha() * mAlpha);
return true;
}
-
void onDrawDrawable(SkDrawable* drawable, const SkMatrix* matrix) override {
// We unroll the drawable using "this" canvas, so that draw calls contained inside will
// get their alpha applied. The default SkPaintFilterCanvas::onDrawDrawable does not unroll.
@@ -293,7 +292,7 @@
// with the same canvas transformation + clip into the target
// canvas then draw the layer on top
if (renderNode->hasHolePunches()) {
- TransformCanvas transformCanvas(canvas, SkBlendMode::kDstOut);
+ TransformCanvas transformCanvas(canvas, SkBlendMode::kClear);
displayList->draw(&transformCanvas);
}
canvas->drawImageRect(snapshotImage, SkRect::Make(srcBounds),
diff --git a/libs/hwui/pipeline/skia/SkiaRecordingCanvas.cpp b/libs/hwui/pipeline/skia/SkiaRecordingCanvas.cpp
index 1f87865..5c6117d 100644
--- a/libs/hwui/pipeline/skia/SkiaRecordingCanvas.cpp
+++ b/libs/hwui/pipeline/skia/SkiaRecordingCanvas.cpp
@@ -69,22 +69,20 @@
mDisplayList->setHasHolePunches(false);
}
-void SkiaRecordingCanvas::punchHole(const SkRRect& rect, float alpha) {
- // Add the marker annotation to allow HWUI to determine the current
- // clip/transformation and alpha should be applied
+void SkiaRecordingCanvas::punchHole(const SkRRect& rect) {
+ // Add the marker annotation to allow HWUI to determine where the current
+ // clip/transformation should be applied
SkVector vector = rect.getSimpleRadii();
- float data[3];
+ float data[2];
data[0] = vector.x();
data[1] = vector.y();
- data[2] = alpha;
mRecorder.drawAnnotation(rect.rect(), HOLE_PUNCH_ANNOTATION.c_str(),
- SkData::MakeWithCopy(data, sizeof(data)));
+ SkData::MakeWithCopy(data, 2 * sizeof(float)));
// Clear the current rect within the layer itself
SkPaint paint = SkPaint();
- paint.setColor(SkColors::kBlack);
- paint.setAlphaf(alpha);
- paint.setBlendMode(SkBlendMode::kDstOut);
+ paint.setColor(0);
+ paint.setBlendMode(SkBlendMode::kClear);
mRecorder.drawRRect(rect, paint);
mDisplayList->setHasHolePunches(true);
diff --git a/libs/hwui/pipeline/skia/SkiaRecordingCanvas.h b/libs/hwui/pipeline/skia/SkiaRecordingCanvas.h
index 7844e2c..89e3a2c 100644
--- a/libs/hwui/pipeline/skia/SkiaRecordingCanvas.h
+++ b/libs/hwui/pipeline/skia/SkiaRecordingCanvas.h
@@ -50,7 +50,7 @@
initDisplayList(renderNode, width, height);
}
- virtual void punchHole(const SkRRect& rect, float alpha) override;
+ virtual void punchHole(const SkRRect& rect) override;
virtual void finishRecording(uirenderer::RenderNode* destination) override;
std::unique_ptr<SkiaDisplayList> finishRecording();
diff --git a/libs/hwui/pipeline/skia/TransformCanvas.cpp b/libs/hwui/pipeline/skia/TransformCanvas.cpp
index c320df0..33160d0 100644
--- a/libs/hwui/pipeline/skia/TransformCanvas.cpp
+++ b/libs/hwui/pipeline/skia/TransformCanvas.cpp
@@ -29,15 +29,13 @@
void TransformCanvas::onDrawAnnotation(const SkRect& rect, const char* key, SkData* value) {
if (HOLE_PUNCH_ANNOTATION == key) {
auto* rectParams = reinterpret_cast<const float*>(value->data());
- const float radiusX = rectParams[0];
- const float radiusY = rectParams[1];
- const float alpha = rectParams[2];
+ float radiusX = rectParams[0];
+ float radiusY = rectParams[1];
SkRRect roundRect = SkRRect::MakeRectXY(rect, radiusX, radiusY);
SkPaint paint;
paint.setColor(SkColors::kBlack);
paint.setBlendMode(mHolePunchBlendMode);
- paint.setAlphaf(alpha);
mWrappedCanvas->drawRRect(roundRect, paint);
}
}
diff --git a/libs/hwui/tests/common/scenes/StretchyListViewAnimation.cpp b/libs/hwui/tests/common/scenes/StretchyListViewAnimation.cpp
index 7d3ca96..59230a7 100644
--- a/libs/hwui/tests/common/scenes/StretchyListViewAnimation.cpp
+++ b/libs/hwui/tests/common/scenes/StretchyListViewAnimation.cpp
@@ -138,7 +138,7 @@
roundRectPaint.setColor(Color::White);
if (addHolePunch) {
// Punch a hole but then cover it up, we don't want to actually see it
- canvas.punchHole(SkRRect::MakeRect(SkRect::MakeWH(itemWidth, itemHeight)), 1.f);
+ canvas.punchHole(SkRRect::MakeRect(SkRect::MakeWH(itemWidth, itemHeight)));
}
canvas.drawRoundRect(0, 0, itemWidth, itemHeight, dp(6), dp(6), roundRectPaint);
@@ -235,4 +235,4 @@
StretchEffectBehavior stretchBehavior() override { return StretchEffectBehavior::UniformScale; }
bool haveHolePunch() override { return true; }
bool forceLayer() override { return true; }
-};
+};
\ No newline at end of file
diff --git a/tests/HwAccelerationTest/AndroidManifest.xml b/tests/HwAccelerationTest/AndroidManifest.xml
index 939c7de..b0ccbd1 100644
--- a/tests/HwAccelerationTest/AndroidManifest.xml
+++ b/tests/HwAccelerationTest/AndroidManifest.xml
@@ -436,15 +436,6 @@
</intent-filter>
</activity>
- <activity android:name="SurfaceViewAlphaActivity"
- android:label="SurfaceView/SurfaceView with Alpha"
- android:exported="true">
- <intent-filter>
- <action android:name="android.intent.action.MAIN"/>
- <category android:name="com.android.test.hwui.TEST"/>
- </intent-filter>
- </activity>
-
<activity android:name=".PenStylusActivity"
android:label="Pen/Draw"
android:exported="true">
diff --git a/tests/HwAccelerationTest/src/com/android/test/hwui/SurfaceViewAlphaActivity.java b/tests/HwAccelerationTest/src/com/android/test/hwui/SurfaceViewAlphaActivity.java
deleted file mode 100644
index 01fe6ae0..0000000
--- a/tests/HwAccelerationTest/src/com/android/test/hwui/SurfaceViewAlphaActivity.java
+++ /dev/null
@@ -1,168 +0,0 @@
-/*
- * Copyright 2022 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 com.android.test.hwui;
-
-import android.app.Activity;
-import android.graphics.Canvas;
-import android.graphics.Color;
-import android.os.Bundle;
-import android.view.SurfaceHolder;
-import android.view.SurfaceHolder.Callback;
-import android.view.SurfaceView;
-import android.view.View;
-import android.widget.Button;
-import android.widget.LinearLayout;
-import android.widget.RelativeLayout;
-import android.widget.SeekBar;
-import android.widget.TextView;
-
-public class SurfaceViewAlphaActivity extends Activity implements Callback {
- SurfaceView mSurfaceView;
-
- private enum ZOrder {
- ABOVE,
- BELOW
- }
-
- private float mAlpha = 127f / 255f;
- private ZOrder mZOrder = ZOrder.BELOW;
-
-
- private String getAlphaText() {
- return "Alpha: " + mAlpha;
- }
-
- private void toggleZOrder() {
- if (ZOrder.ABOVE.equals(mZOrder)) {
- mZOrder = ZOrder.BELOW;
- } else {
- mZOrder = ZOrder.ABOVE;
- }
- }
-
- // Overlaps a blue view on the left, then the SurfaceView in the center, then a blue view on the
- // right.
- private void overlapViews(SurfaceView view, LinearLayout parent) {
- float density = getResources().getDisplayMetrics().density;
- int surfaceViewSize = (int) (200 * density);
- int blueViewSize = (int) (surfaceViewSize * 2 / 3f);
- int totalSize = (int) (surfaceViewSize * 5 / 3f);
-
- RelativeLayout overlapLayout = new RelativeLayout(this);
-
- RelativeLayout.LayoutParams leftViewLayoutParams = new RelativeLayout.LayoutParams(
- blueViewSize, surfaceViewSize);
- leftViewLayoutParams.addRule(RelativeLayout.ALIGN_PARENT_LEFT);
-
- View leftBlueView = new View(this);
- leftBlueView.setBackgroundColor(Color.BLUE);
- overlapLayout.addView(leftBlueView, leftViewLayoutParams);
-
- RelativeLayout.LayoutParams sVLayoutParams = new RelativeLayout.LayoutParams(
- surfaceViewSize, surfaceViewSize);
- sVLayoutParams.addRule(RelativeLayout.CENTER_IN_PARENT);
- overlapLayout.addView(view, sVLayoutParams);
-
- RelativeLayout.LayoutParams rightViewLayoutParams = new RelativeLayout.LayoutParams(
- blueViewSize, surfaceViewSize);
- rightViewLayoutParams.addRule(RelativeLayout.ALIGN_PARENT_RIGHT);
-
- View rightBlueView = new View(this);
- rightBlueView.setBackgroundColor(Color.BLUE);
- overlapLayout.addView(rightBlueView, rightViewLayoutParams);
-
- parent.addView(overlapLayout, new LinearLayout.LayoutParams(
- totalSize, surfaceViewSize));
- }
-
- @Override
- protected void onCreate(Bundle savedInstanceState) {
- super.onCreate(savedInstanceState);
-
- mSurfaceView = new SurfaceView(this);
- mSurfaceView.getHolder().addCallback(this);
- mSurfaceView.setAlpha(mAlpha);
-
- LinearLayout content = new LinearLayout(this);
- content.setOrientation(LinearLayout.VERTICAL);
-
- TextView alphaText = new TextView(this);
- alphaText.setText(getAlphaText());
-
- SeekBar alphaToggle = new SeekBar(this);
- alphaToggle.setMin(0);
- alphaToggle.setMax(255);
- alphaToggle.setProgress(Math.round(mAlpha * 255));
- alphaToggle.setOnSeekBarChangeListener(new SeekBar.OnSeekBarChangeListener() {
- @Override
- public void onProgressChanged(SeekBar seekBar, int progress, boolean fromUser) {
- mAlpha = progress / 255f;
- alphaText.setText(getAlphaText());
- mSurfaceView.setAlpha(mAlpha);
- }
-
- @Override
- public void onStartTrackingTouch(SeekBar seekBar) {
-
- }
-
- @Override
- public void onStopTrackingTouch(SeekBar seekBar) {
-
- }
- });
-
- content.addView(alphaText, new LinearLayout.LayoutParams(
- LinearLayout.LayoutParams.WRAP_CONTENT,
- LinearLayout.LayoutParams.WRAP_CONTENT));
-
- content.addView(alphaToggle, new LinearLayout.LayoutParams(
- LinearLayout.LayoutParams.MATCH_PARENT,
- LinearLayout.LayoutParams.WRAP_CONTENT));
-
- Button button = new Button(this);
- button.setText("Z " + mZOrder.toString());
- button.setOnClickListener(v -> {
- toggleZOrder();
- mSurfaceView.setZOrderOnTop(ZOrder.ABOVE.equals(mZOrder));
- button.setText("Z " + mZOrder.toString());
- });
-
- content.addView(button, new LinearLayout.LayoutParams(
- LinearLayout.LayoutParams.WRAP_CONTENT,
- LinearLayout.LayoutParams.WRAP_CONTENT));
-
- overlapViews(mSurfaceView, content);
-
- setContentView(content);
- }
-
- @Override
- public void surfaceCreated(SurfaceHolder holder) {
- }
-
- @Override
- public void surfaceChanged(SurfaceHolder holder, int format, int width, int height) {
- Canvas canvas = holder.lockCanvas();
- canvas.drawColor(Color.RED);
- holder.unlockCanvasAndPost(canvas);
- }
-
- @Override
- public void surfaceDestroyed(SurfaceHolder holder) {
- }
-}