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/*
* Copyright (C) 2011 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 android.graphics.Bitmap;
import android.graphics.Matrix;
import android.graphics.Paint;
import android.graphics.SurfaceTexture;
import com.android.internal.util.VirtualRefBasePtr;
/**
* A hardware layer can be used to render graphics operations into a hardware
* friendly buffer. For instance, with an OpenGL backend a hardware layer
* would use a Frame Buffer Object (FBO.) The hardware layer can be used as
* a drawing cache when a complex set of graphics operations needs to be
* drawn several times.
*
* @hide
*/
final class HardwareLayer {
private HardwareRenderer mRenderer;
private VirtualRefBasePtr mFinalizer;
private HardwareLayer(HardwareRenderer renderer, long deferredUpdater) {
if (renderer == null || deferredUpdater == 0) {
throw new IllegalArgumentException("Either hardware renderer: " + renderer
+ " or deferredUpdater: " + deferredUpdater + " is invalid");
}
mRenderer = renderer;
mFinalizer = new VirtualRefBasePtr(deferredUpdater);
}
/**
* Update the paint used when drawing this layer.
*
* @param paint The paint used when the layer is drawn into the destination canvas.
* @see View#setLayerPaint(android.graphics.Paint)
*/
public void setLayerPaint(Paint paint) {
nSetLayerPaint(mFinalizer.get(), paint.getNativeInstance());
mRenderer.pushLayerUpdate(this);
}
/**
* Indicates whether this layer can be rendered.
*
* @return True if the layer can be rendered into, false otherwise
*/
public boolean isValid() {
return mFinalizer != null && mFinalizer.get() != 0;
}
/**
* Destroys resources without waiting for a GC.
*/
public void destroy() {
if (!isValid()) {
// Already destroyed
return;
}
mRenderer.onLayerDestroyed(this);
mRenderer = null;
mFinalizer.release();
mFinalizer = null;
}
public long getDeferredLayerUpdater() {
return mFinalizer.get();
}
/**
* Copies this layer into the specified bitmap.
*
* @param bitmap The bitmap to copy they layer into
*
* @return True if the copy was successful, false otherwise
*/
public boolean copyInto(Bitmap bitmap) {
return mRenderer.copyLayerInto(this, bitmap);
}
/**
* Update the layer's properties. Note that after calling this isValid() may
* return false if the requested width/height cannot be satisfied
*
* @param width The new width of this layer
* @param height The new height of this layer
* @param isOpaque Whether this layer is opaque
*
* @return true if the layer's properties will change, false if they already
* match the desired values.
*/
public boolean prepare(int width, int height, boolean isOpaque) {
return nPrepare(mFinalizer.get(), width, height, isOpaque);
}
/**
* Sets an optional transform on this layer.
*
* @param matrix The transform to apply to the layer.
*/
public void setTransform(Matrix matrix) {
nSetTransform(mFinalizer.get(), matrix.native_instance);
mRenderer.pushLayerUpdate(this);
}
/**
* Indicates that this layer has lost its texture.
*/
public void detachSurfaceTexture() {
mRenderer.detachSurfaceTexture(mFinalizer.get());
}
public long getLayerHandle() {
return mFinalizer.get();
}
public void setSurfaceTexture(SurfaceTexture surface) {
nSetSurfaceTexture(mFinalizer.get(), surface, false);
mRenderer.pushLayerUpdate(this);
}
public void updateSurfaceTexture() {
nUpdateSurfaceTexture(mFinalizer.get());
mRenderer.pushLayerUpdate(this);
}
static HardwareLayer adoptTextureLayer(HardwareRenderer renderer, long layer) {
return new HardwareLayer(renderer, layer);
}
private static native boolean nPrepare(long layerUpdater, int width, int height, boolean isOpaque);
private static native void nSetLayerPaint(long layerUpdater, long paint);
private static native void nSetTransform(long layerUpdater, long matrix);
private static native void nSetSurfaceTexture(long layerUpdater,
SurfaceTexture surface, boolean isAlreadyAttached);
private static native void nUpdateSurfaceTexture(long layerUpdater);
private static native void nUpdateRenderLayer(long layerUpdater, long displayList,
int left, int top, int right, int bottom);
private static native int nGetTexName(long layerUpdater);
}
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