diff options
Diffstat (limited to 'src/com/android/gallery3d/ingest/ui/MtpImageView.java')
| -rw-r--r-- | src/com/android/gallery3d/ingest/ui/MtpImageView.java | 280 |
1 files changed, 280 insertions, 0 deletions
diff --git a/src/com/android/gallery3d/ingest/ui/MtpImageView.java b/src/com/android/gallery3d/ingest/ui/MtpImageView.java new file mode 100644 index 000000000..80c105126 --- /dev/null +++ b/src/com/android/gallery3d/ingest/ui/MtpImageView.java @@ -0,0 +1,280 @@ +/* + * Copyright (C) 2013 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.gallery3d.ingest.ui; + +import android.content.Context; +import android.graphics.Canvas; +import android.graphics.Matrix; +import android.graphics.drawable.Drawable; +import android.mtp.MtpDevice; +import android.mtp.MtpObjectInfo; +import android.os.Handler; +import android.os.HandlerThread; +import android.os.Looper; +import android.os.Message; +import android.util.AttributeSet; +import android.widget.ImageView; + +import com.android.gallery3d.R; +import com.android.gallery3d.ingest.MtpDeviceIndex; +import com.android.gallery3d.ingest.data.BitmapWithMetadata; +import com.android.gallery3d.ingest.data.MtpBitmapFetch; + +import java.lang.ref.WeakReference; + +public class MtpImageView extends ImageView { + // We will use the thumbnail for images larger than this threshold + private static final int MAX_FULLSIZE_PREVIEW_SIZE = 8388608; // 8 megabytes + + private int mObjectHandle; + private int mGeneration; + + private WeakReference<MtpImageView> mWeakReference = new WeakReference<MtpImageView>(this); + private Object mFetchLock = new Object(); + private boolean mFetchPending = false; + private MtpObjectInfo mFetchObjectInfo; + private MtpDevice mFetchDevice; + private Object mFetchResult; + private Drawable mOverlayIcon; + private boolean mShowOverlayIcon; + + private static final FetchImageHandler sFetchHandler = FetchImageHandler.createOnNewThread(); + private static final ShowImageHandler sFetchCompleteHandler = new ShowImageHandler(); + + private void init() { + showPlaceholder(); + } + + public MtpImageView(Context context) { + super(context); + init(); + } + + public MtpImageView(Context context, AttributeSet attrs) { + super(context, attrs); + init(); + } + + public MtpImageView(Context context, AttributeSet attrs, int defStyle) { + super(context, attrs, defStyle); + init(); + } + + private void showPlaceholder() { + setImageResource(android.R.color.transparent); + } + + public void setMtpDeviceAndObjectInfo(MtpDevice device, MtpObjectInfo object, int gen) { + int handle = object.getObjectHandle(); + if (handle == mObjectHandle && gen == mGeneration) { + return; + } + cancelLoadingAndClear(); + showPlaceholder(); + mGeneration = gen; + mObjectHandle = handle; + mShowOverlayIcon = MtpDeviceIndex.SUPPORTED_VIDEO_FORMATS.contains(object.getFormat()); + if (mShowOverlayIcon && mOverlayIcon == null) { + mOverlayIcon = getResources().getDrawable(R.drawable.ic_control_play); + updateOverlayIconBounds(); + } + synchronized (mFetchLock) { + mFetchObjectInfo = object; + mFetchDevice = device; + if (mFetchPending) return; + mFetchPending = true; + sFetchHandler.sendMessage( + sFetchHandler.obtainMessage(0, mWeakReference)); + } + } + + protected Object fetchMtpImageDataFromDevice(MtpDevice device, MtpObjectInfo info) { + if (info.getCompressedSize() <= MAX_FULLSIZE_PREVIEW_SIZE + && MtpDeviceIndex.SUPPORTED_IMAGE_FORMATS.contains(info.getFormat())) { + return MtpBitmapFetch.getFullsize(device, info); + } else { + return new BitmapWithMetadata(MtpBitmapFetch.getThumbnail(device, info), 0); + } + } + + private float mLastBitmapWidth; + private float mLastBitmapHeight; + private int mLastRotationDegrees; + private Matrix mDrawMatrix = new Matrix(); + + private void updateDrawMatrix() { + mDrawMatrix.reset(); + float dwidth; + float dheight; + float vheight = getHeight(); + float vwidth = getWidth(); + float scale; + boolean rotated90 = (mLastRotationDegrees % 180 != 0); + if (rotated90) { + dwidth = mLastBitmapHeight; + dheight = mLastBitmapWidth; + } else { + dwidth = mLastBitmapWidth; + dheight = mLastBitmapHeight; + } + if (dwidth <= vwidth && dheight <= vheight) { + scale = 1.0f; + } else { + scale = Math.min(vwidth / dwidth, vheight / dheight); + } + mDrawMatrix.setScale(scale, scale); + if (rotated90) { + mDrawMatrix.postTranslate(-dheight * scale * 0.5f, + -dwidth * scale * 0.5f); + mDrawMatrix.postRotate(mLastRotationDegrees); + mDrawMatrix.postTranslate(dwidth * scale * 0.5f, + dheight * scale * 0.5f); + } + mDrawMatrix.postTranslate((vwidth - dwidth * scale) * 0.5f, + (vheight - dheight * scale) * 0.5f); + if (!rotated90 && mLastRotationDegrees > 0) { + // rotated by a multiple of 180 + mDrawMatrix.postRotate(mLastRotationDegrees, vwidth / 2, vheight / 2); + } + setImageMatrix(mDrawMatrix); + } + + private static final int OVERLAY_ICON_SIZE_DENOMINATOR = 4; + + private void updateOverlayIconBounds() { + int iheight = mOverlayIcon.getIntrinsicHeight(); + int iwidth = mOverlayIcon.getIntrinsicWidth(); + int vheight = getHeight(); + int vwidth = getWidth(); + float scale_height = ((float) vheight) / (iheight * OVERLAY_ICON_SIZE_DENOMINATOR); + float scale_width = ((float) vwidth) / (iwidth * OVERLAY_ICON_SIZE_DENOMINATOR); + if (scale_height >= 1f && scale_width >= 1f) { + mOverlayIcon.setBounds((vwidth - iwidth) / 2, + (vheight - iheight) / 2, + (vwidth + iwidth) / 2, + (vheight + iheight) / 2); + } else { + float scale = Math.min(scale_height, scale_width); + mOverlayIcon.setBounds((int) (vwidth - scale * iwidth) / 2, + (int) (vheight - scale * iheight) / 2, + (int) (vwidth + scale * iwidth) / 2, + (int) (vheight + scale * iheight) / 2); + } + } + + @Override + protected void onLayout(boolean changed, int left, int top, int right, int bottom) { + super.onLayout(changed, left, top, right, bottom); + if (changed && getScaleType() == ScaleType.MATRIX) { + updateDrawMatrix(); + } + if (mShowOverlayIcon && changed && mOverlayIcon != null) { + updateOverlayIconBounds(); + } + } + + @Override + protected void onDraw(Canvas canvas) { + super.onDraw(canvas); + if (mShowOverlayIcon && mOverlayIcon != null) { + mOverlayIcon.draw(canvas); + } + } + + protected void onMtpImageDataFetchedFromDevice(Object result) { + BitmapWithMetadata bitmapWithMetadata = (BitmapWithMetadata)result; + if (getScaleType() == ScaleType.MATRIX) { + mLastBitmapHeight = bitmapWithMetadata.bitmap.getHeight(); + mLastBitmapWidth = bitmapWithMetadata.bitmap.getWidth(); + mLastRotationDegrees = bitmapWithMetadata.rotationDegrees; + updateDrawMatrix(); + } else { + setRotation(bitmapWithMetadata.rotationDegrees); + } + setAlpha(0f); + setImageBitmap(bitmapWithMetadata.bitmap); + animate().alpha(1f); + } + + protected void cancelLoadingAndClear() { + synchronized (mFetchLock) { + mFetchDevice = null; + mFetchObjectInfo = null; + mFetchResult = null; + } + animate().cancel(); + setImageResource(android.R.color.transparent); + } + + @Override + public void onDetachedFromWindow() { + cancelLoadingAndClear(); + super.onDetachedFromWindow(); + } + + private static class FetchImageHandler extends Handler { + public FetchImageHandler(Looper l) { + super(l); + } + + public static FetchImageHandler createOnNewThread() { + HandlerThread t = new HandlerThread("MtpImageView Fetch"); + t.start(); + return new FetchImageHandler(t.getLooper()); + } + + @Override + public void handleMessage(Message msg) { + @SuppressWarnings("unchecked") + MtpImageView parent = ((WeakReference<MtpImageView>) msg.obj).get(); + if (parent == null) return; + MtpObjectInfo objectInfo; + MtpDevice device; + synchronized (parent.mFetchLock) { + parent.mFetchPending = false; + device = parent.mFetchDevice; + objectInfo = parent.mFetchObjectInfo; + } + if (device == null) return; + Object result = parent.fetchMtpImageDataFromDevice(device, objectInfo); + if (result == null) return; + synchronized (parent.mFetchLock) { + if (parent.mFetchObjectInfo != objectInfo) return; + parent.mFetchResult = result; + parent.mFetchDevice = null; + parent.mFetchObjectInfo = null; + sFetchCompleteHandler.sendMessage( + sFetchCompleteHandler.obtainMessage(0, parent.mWeakReference)); + } + } + } + + private static class ShowImageHandler extends Handler { + @Override + public void handleMessage(Message msg) { + @SuppressWarnings("unchecked") + MtpImageView parent = ((WeakReference<MtpImageView>) msg.obj).get(); + if (parent == null) return; + Object result; + synchronized (parent.mFetchLock) { + result = parent.mFetchResult; + } + if (result == null) return; + parent.onMtpImageDataFetchedFromDevice(result); + } + } +} |