/**
* Copies the content of this view's surface texture into the specified bitmap. If the surface
* texture is not available, the copy is not executed. The content of the surface texture will be
* scaled to fit exactly inside the specified bitmap.
*
* <p><strong>Do not</strong> invoke this method from a drawing method ({@link
* #onDraw(android.graphics.Canvas)} for instance).
*
* <p>If an error occurs, the bitmap is left unchanged.
*
* @param bitmap The bitmap to copy the content of the surface texture into, cannot be null, all
* configurations are supported
* @return The bitmap specified as a parameter
* @see #isAvailable()
* @see #getBitmap(int, int)
* @see #getBitmap()
* @throws IllegalStateException if the hardware rendering context cannot be acquired to capture
* the bitmap
*/
public Bitmap getBitmap(Bitmap bitmap) {
if (bitmap != null && isAvailable()) {
AttachInfo info = mAttachInfo;
if (info != null && info.mHardwareRenderer != null && info.mHardwareRenderer.isEnabled()) {
if (!info.mHardwareRenderer.validate()) {
throw new IllegalStateException("Could not acquire hardware rendering context");
}
}
applyUpdate();
applyTransformMatrix();
// This case can happen if the app invokes setSurfaceTexture() before
// we are able to create the hardware layer. We can safely initialize
// the layer here thanks to the validate() call at the beginning of
// this method
if (mLayer == null && mUpdateSurface) {
getHardwareLayer();
}
if (mLayer != null) {
mLayer.copyInto(bitmap);
}
}
return bitmap;
}
private void destroySurface() {
if (mLayer != null) {
mSurface.detachFromGLContext();
// SurfaceTexture owns the texture name and detachFromGLContext
// should have deleted it
mLayer.clearStorage();
boolean shouldRelease = true;
if (mListener != null) {
shouldRelease = mListener.onSurfaceTextureDestroyed(mSurface);
}
synchronized (mNativeWindowLock) {
nDestroyNativeWindow();
}
mLayer.destroy();
if (shouldRelease) mSurface.release();
mSurface = null;
mLayer = null;
mHadSurface = true;
}
}
private void applyUpdate() {
if (mLayer == null) {
return;
}
synchronized (mLock) {
if (mUpdateLayer) {
mUpdateLayer = false;
} else {
return;
}
}
mLayer.update(getWidth(), getHeight(), mOpaque);
if (mListener != null) {
mListener.onSurfaceTextureUpdated(mSurface);
}
}
private void applyTransformMatrix() {
if (mMatrixChanged && mLayer != null) {
mLayer.setTransform(mMatrix);
mMatrixChanged = false;
}
}
@Override
HardwareLayer getHardwareLayer() {
// NOTE: Maintain these two lines very carefully (see View.java)
mPrivateFlags |= PFLAG_DRAWN | PFLAG_DRAWING_CACHE_VALID;
mPrivateFlags &= ~PFLAG_DIRTY_MASK;
if (mLayer == null) {
if (mAttachInfo == null || mAttachInfo.mHardwareRenderer == null) {
return null;
}
mLayer = mAttachInfo.mHardwareRenderer.createHardwareLayer(mOpaque);
if (!mUpdateSurface) {
// Create a new SurfaceTexture for the layer.
mSurface = mAttachInfo.mHardwareRenderer.createSurfaceTexture(mLayer);
}
mSurface.setDefaultBufferSize(getWidth(), getHeight());
nCreateNativeWindow(mSurface);
mUpdateListener =
new SurfaceTexture.OnFrameAvailableListener() {
@Override
public void onFrameAvailable(SurfaceTexture surfaceTexture) {
// Per SurfaceTexture's documentation, the callback may be invoked
// from an arbitrary thread
updateLayer();
if (Looper.myLooper() == Looper.getMainLooper()) {
invalidate();
} else {
postInvalidate();
}
}
};
mSurface.setOnFrameAvailableListener(mUpdateListener);
if (mListener != null && !mUpdateSurface) {
mListener.onSurfaceTextureAvailable(mSurface, getWidth(), getHeight());
}
mLayer.setLayerPaint(mLayerPaint);
}
if (mUpdateSurface) {
// Someone has requested that we use a specific SurfaceTexture, so
// tell mLayer about it and set the SurfaceTexture to use the
// current view size.
mUpdateSurface = false;
// Since we are updating the layer, force an update to ensure its
// parameters are correct (width, height, transform, etc.)
updateLayer();
mMatrixChanged = true;
mAttachInfo.mHardwareRenderer.setSurfaceTexture(mLayer, mSurface);
mSurface.setDefaultBufferSize(getWidth(), getHeight());
}
applyUpdate();
applyTransformMatrix();
return mLayer;
}