path: root/src/com/android/launcher3/WallpaperCropActivity.java

/*
 * 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.launcher3;

import android.app.Activity;
import android.app.WallpaperManager;
import android.content.Context;
import android.content.SharedPreferences;
import android.content.res.Resources;
import android.graphics.Bitmap;
import android.graphics.Bitmap.CompressFormat;
import android.graphics.BitmapFactory;
import android.graphics.BitmapRegionDecoder;
import android.graphics.Canvas;
import android.graphics.Matrix;
import android.graphics.Paint;
import android.graphics.Point;
import android.graphics.Rect;
import android.graphics.RectF;
import android.net.Uri;
import android.os.AsyncTask;
import android.util.Log;

import com.android.gallery3d.common.Utils;

import java.io.BufferedInputStream;
import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.io.InputStream;

// LAUNCHER crop activity!
public class WallpaperCropActivity extends Activity {
    private static final String LOGTAG = "Launcher3.CropActivity";

    protected static final String WALLPAPER_WIDTH_KEY = "wallpaper.width";
    protected static final String WALLPAPER_HEIGHT_KEY = "wallpaper.height";
    private static final int DEFAULT_COMPRESS_QUALITY = 90;
    /**
     * The maximum bitmap size we allow to be returned through the intent.
     * Intents have a maximum of 1MB in total size. However, the Bitmap seems to
     * have some overhead to hit so that we go way below the limit here to make
     * sure the intent stays below 1MB.We should consider just returning a byte
     * array instead of a Bitmap instance to avoid overhead.
     */
    public static final int MAX_BMAP_IN_INTENT = 750000;


    protected class BitmapCropTask extends AsyncTask<Void, Void, Boolean> {
        Uri mInUri = null;
        int mInResId = 0;
        InputStream mInStream;
        RectF mCropBounds = null;
        int mOutWidth, mOutHeight;
        int mRotation = 0; // for now
        protected final WallpaperManager mWPManager;
        String mOutputFormat = "jpg"; // for now
        boolean mSetWallpaper;
        boolean mSaveCroppedBitmap;
        Bitmap mCroppedBitmap;
        Runnable mOnEndRunnable;
        Resources mResources;

        public BitmapCropTask(Uri inUri,
                RectF cropBounds, int outWidth, int outHeight,
                boolean setWallpaper, boolean saveCroppedBitmap, Runnable onEndRunnable) {
            mInUri = inUri;
            mCropBounds = cropBounds;
            mOutWidth = outWidth;
            mOutHeight = outHeight;
            mWPManager = WallpaperManager.getInstance(getApplicationContext());
            mSetWallpaper = setWallpaper;
            mSaveCroppedBitmap = saveCroppedBitmap;
            mOnEndRunnable = onEndRunnable;
        }

        public BitmapCropTask(Resources res, int inResId,
                RectF cropBounds, int outWidth, int outHeight,
                boolean setWallpaper, boolean saveCroppedBitmap, Runnable onEndRunnable) {
            mInResId = inResId;
            mCropBounds = cropBounds;
            mOutWidth = outWidth;
            mOutHeight = outHeight;
            mWPManager = WallpaperManager.getInstance(getApplicationContext());
            mSetWallpaper = setWallpaper;
            mSaveCroppedBitmap = saveCroppedBitmap;
            mOnEndRunnable = onEndRunnable;
            mResources = res;
        }

        // Helper to setup input stream
        private void regenerateInputStream() {
            if (mInUri == null && mInResId == 0) {
                Log.w(LOGTAG, "cannot read original file, no input URI or resource ID given");
            } else {
                Utils.closeSilently(mInStream);
                try {
                    if (mInUri != null) {
                        mInStream = new BufferedInputStream(
                                getContentResolver().openInputStream(mInUri));
                    } else {
                        mInStream = new BufferedInputStream(
                                mResources.openRawResource(mInResId));
                    }
                } catch (FileNotFoundException e) {
                    Log.w(LOGTAG, "cannot read file: " + mInUri.toString(), e);
                }
            }
        }

        public Point getImageBounds() {
            regenerateInputStream();
            if (mInStream != null) {
                BitmapFactory.Options options = new BitmapFactory.Options();
                options.inJustDecodeBounds = true;
                BitmapFactory.decodeStream(mInStream, null, options);
                if (options.outWidth != 0 && options.outHeight != 0) {
                    return new Point(options.outWidth, options.outHeight);
                }
            }
            return null;
        }

        public void setCropBounds(RectF cropBounds) {
            mCropBounds = cropBounds;
        }

        public Bitmap getCroppedBitmap() {
            return mCroppedBitmap;
        }
        public boolean cropBitmap() {
            boolean failure = false;

            regenerateInputStream();

            if (mInStream != null) {
                // Find crop bounds (scaled to original image size)
                Rect roundedTrueCrop = new Rect();
                mCropBounds.roundOut(roundedTrueCrop);

                if (roundedTrueCrop.width() <= 0 || roundedTrueCrop.height() <= 0) {
                    Log.w(LOGTAG, "crop has bad values for full size image");
                    failure = true;
                    return false;
                }

                // See how much we're reducing the size of the image
                int scaleDownSampleSize = Math.min(roundedTrueCrop.width() / mOutWidth,
                        roundedTrueCrop.height() / mOutHeight);

                // Attempt to open a region decoder
                BitmapRegionDecoder decoder = null;
                try {
                    decoder = BitmapRegionDecoder.newInstance(mInStream, true);
                } catch (IOException e) {
                    Log.w(LOGTAG, "cannot open region decoder for file: " + mInUri.toString(), e);
                }

                Bitmap crop = null;
                if (decoder != null) {
                    // Do region decoding to get crop bitmap
                    BitmapFactory.Options options = new BitmapFactory.Options();
                    if (scaleDownSampleSize > 1) {
                        options.inSampleSize = scaleDownSampleSize;
                    }
                    crop = decoder.decodeRegion(roundedTrueCrop, options);
                    decoder.recycle();
                }

                if (crop == null) {
                    // BitmapRegionDecoder has failed, try to crop in-memory
                    regenerateInputStream();
                    Bitmap fullSize = null;
                    if (mInStream != null) {
                        BitmapFactory.Options options = new BitmapFactory.Options();
                        if (scaleDownSampleSize > 1) {
                            options.inSampleSize = scaleDownSampleSize;
                        }
                        fullSize = BitmapFactory.decodeStream(mInStream, null, options);
                    }
                    if (fullSize != null) {
                        crop = Bitmap.createBitmap(fullSize, roundedTrueCrop.left,
                                roundedTrueCrop.top, roundedTrueCrop.width(),
                                roundedTrueCrop.height());
                    }
                }

                if (crop == null) {
                    Log.w(LOGTAG, "cannot decode file: " + mInUri.toString());
                    failure = true;
                    return false;
                }
                if (mOutWidth > 0 && mOutHeight > 0) {
                    Matrix m = new Matrix();
                    RectF cropRect = new RectF(0, 0, crop.getWidth(), crop.getHeight());
                    if (mRotation > 0) {
                        m.setRotate(mRotation);
                        m.mapRect(cropRect);
                    }
                    RectF returnRect = new RectF(0, 0, mOutWidth, mOutHeight);
                    m.setRectToRect(cropRect, returnRect, Matrix.ScaleToFit.FILL);
                    m.preRotate(mRotation);
                    Bitmap tmp = Bitmap.createBitmap((int) returnRect.width(),
                            (int) returnRect.height(), Bitmap.Config.ARGB_8888);
                    if (tmp != null) {
                        Canvas c = new Canvas(tmp);
                        c.drawBitmap(crop, m, new Paint());
                        crop = tmp;
                    }
                } else if (mRotation > 0) {
                    Matrix m = new Matrix();
                    m.setRotate(mRotation);
                    Bitmap tmp = Bitmap.createBitmap(crop, 0, 0, crop.getWidth(),
                            crop.getHeight(), m, true);
                    if (tmp != null) {
                        crop = tmp;
                    }
                }

                if (mSaveCroppedBitmap) {
                    mCroppedBitmap = crop;
                }

                // Get output compression format
                CompressFormat cf =
                        convertExtensionToCompressFormat(getFileExtension(mOutputFormat));

                // Compress to byte array
                ByteArrayOutputStream tmpOut = new ByteArrayOutputStream(2048);
                if (crop.compress(cf, DEFAULT_COMPRESS_QUALITY, tmpOut)) {
                    // If we need to set to the wallpaper, set it
                    if (mSetWallpaper && mWPManager != null) {
                        if (mWPManager == null) {
                            Log.w(LOGTAG, "no wallpaper manager");
                            failure = true;
                        } else {
                            try {
                                mWPManager.setStream(new ByteArrayInputStream(tmpOut
                                        .toByteArray()));
                            } catch (IOException e) {
                                Log.w(LOGTAG, "cannot write stream to wallpaper", e);
                                failure = true;
                            }
                        }
                    }
                    if (mOnEndRunnable != null) {
                        mOnEndRunnable.run();
                    }
                } else {
                    Log.w(LOGTAG, "cannot compress bitmap");
                    failure = true;
                }
            }
            return !failure; // True if any of the operations failed
        }

        @Override
        protected Boolean doInBackground(Void... params) {
            return cropBitmap();
        }

        @Override
        protected void onPostExecute(Boolean result) {
            setResult(Activity.RESULT_OK);
            finish();
        }
    }

    protected void updateWallpaperDimensions(int width, int height) {
        String spKey = LauncherAppState.getSharedPreferencesKey();
        SharedPreferences sp = getSharedPreferences(spKey, Context.MODE_PRIVATE);
        SharedPreferences.Editor editor = sp.edit();
        if (width != 0 && height != 0) {
            editor.putInt(WALLPAPER_WIDTH_KEY, width);
            editor.putInt(WALLPAPER_HEIGHT_KEY, height);
        } else {
            editor.remove(WALLPAPER_WIDTH_KEY);
            editor.remove(WALLPAPER_HEIGHT_KEY);
        }
        editor.commit();

        WallpaperPickerActivity.suggestWallpaperDimension(getResources(),
                sp, getWindowManager(), WallpaperManager.getInstance(this));
    }

    protected static CompressFormat convertExtensionToCompressFormat(String extension) {
        return extension.equals("png") ? CompressFormat.PNG : CompressFormat.JPEG;
    }

    protected static String getFileExtension(String requestFormat) {
        String outputFormat = (requestFormat == null)
                ? "jpg"
                : requestFormat;
        outputFormat = outputFormat.toLowerCase();
        return (outputFormat.equals("png") || outputFormat.equals("gif"))
                ? "png" // We don't support gif compression.
                : "jpg";
    }
}