src/com/android/gallery3d/data/DecodeUtils.java - platform/packages/apps/Gallery2 - Git at Google

 /*
  * Copyright (C) 2010 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.data;

 import android.graphics.Bitmap;
 import android.graphics.Bitmap.Config;
 import android.graphics.BitmapFactory;
 import android.graphics.BitmapFactory.Options;
 import android.graphics.BitmapRegionDecoder;
 import android.util.FloatMath;

 import com.android.gallery3d.common.BitmapUtils;
 import com.android.gallery3d.common.Utils;
 import com.android.gallery3d.util.ThreadPool.CancelListener;
 import com.android.gallery3d.util.ThreadPool.JobContext;

 import java.io.FileDescriptor;
 import java.io.FileInputStream;
 import java.io.InputStream;

 public class DecodeUtils {
     private static final String TAG = "DecodeService";

     private static class DecodeCanceller implements CancelListener {
         Options mOptions;

         public DecodeCanceller(Options options) {
             mOptions = options;
         }

         @Override
         public void onCancel() {
             mOptions.requestCancelDecode();
         }
     }

     public static Bitmap decode(JobContext jc, FileDescriptor fd, Options options) {
         if (options == null) options = new Options();
         jc.setCancelListener(new DecodeCanceller(options));
         return ensureGLCompatibleBitmap(
                 BitmapFactory.decodeFileDescriptor(fd, null, options));
     }

     public static void decodeBounds(JobContext jc, FileDescriptor fd,
             Options options) {
         Utils.assertTrue(options != null);
         options.inJustDecodeBounds = true;
         jc.setCancelListener(new DecodeCanceller(options));
         BitmapFactory.decodeFileDescriptor(fd, null, options);
         options.inJustDecodeBounds = false;
     }

     public static Bitmap decode(JobContext jc, byte[] bytes, Options options) {
         return decode(jc, bytes, 0, bytes.length, options);
     }

     public static Bitmap decode(JobContext jc, byte[] bytes, int offset,
             int length, Options options) {
         if (options == null) options = new Options();
         jc.setCancelListener(new DecodeCanceller(options));
         return ensureGLCompatibleBitmap(
                 BitmapFactory.decodeByteArray(bytes, offset, length, options));
     }

     public static void decodeBounds(JobContext jc, byte[] bytes, int offset,
             int length, Options options) {
         Utils.assertTrue(options != null);
         options.inJustDecodeBounds = true;
         jc.setCancelListener(new DecodeCanceller(options));
         BitmapFactory.decodeByteArray(bytes, offset, length, options);
         options.inJustDecodeBounds = false;
     }

     public static Bitmap decodeThumbnail(
             JobContext jc, String filePath, Options options, int targetSize, int type) {
         FileInputStream fis = null;
         try {
             fis = new FileInputStream(filePath);
             FileDescriptor fd = fis.getFD();
             return decodeThumbnail(jc, fd, options, targetSize, type);
         } catch (Exception ex) {
             Log.w(TAG, ex);
             return null;
         } finally {
             Utils.closeSilently(fis);
         }
     }

     public static Bitmap decodeThumbnail(
             JobContext jc, FileDescriptor fd, Options options, int targetSize, int type) {
         if (options == null) options = new Options();
         jc.setCancelListener(new DecodeCanceller(options));

         options.inJustDecodeBounds = true;
         BitmapFactory.decodeFileDescriptor(fd, null, options);
         if (jc.isCancelled()) return null;

         int w = options.outWidth;
         int h = options.outHeight;

         if (type == MediaItem.TYPE_MICROTHUMBNAIL) {
             // We center-crop the original image as it's micro thumbnail. In this case,
             // we want to make sure the shorter side >= "targetSize".
             float scale = (float) targetSize / Math.min(w, h);
             options.inSampleSize = BitmapUtils.computeSampleSizeLarger(scale);

             // For an extremely wide image, e.g. 300x30000, we may got OOM when decoding
             // it for TYPE_MICROTHUMBNAIL. So we add a max number of pixels limit here.
             final int MAX_PIXEL_COUNT = 640000; // 400 x 1600
             if ((w / options.inSampleSize) * (h / options.inSampleSize) > MAX_PIXEL_COUNT) {
                 options.inSampleSize = BitmapUtils.computeSampleSize(
                         FloatMath.sqrt((float) MAX_PIXEL_COUNT / (w * h)));
             }
         } else {
             // For screen nail, we only want to keep the longer side >= targetSize.
             float scale = (float) targetSize / Math.max(w, h);
             options.inSampleSize = BitmapUtils.computeSampleSizeLarger(scale);
         }

         options.inJustDecodeBounds = false;

         Bitmap result = BitmapFactory.decodeFileDescriptor(fd, null, options);
         if (result == null) return null;

         // We need to resize down if the decoder does not support inSampleSize
         // (For example, GIF images)
         float scale = (float) targetSize / (type == MediaItem.TYPE_MICROTHUMBNAIL
                 ? Math.min(result.getWidth(), result.getHeight())
                 : Math.max(result.getWidth(), result.getHeight()));

         if (scale <= 0.5) result = BitmapUtils.resizeBitmapByScale(result, scale, true);
         return ensureGLCompatibleBitmap(result);
     }

     /**
      * Decodes the bitmap from the given byte array if the image size is larger than the given
      * requirement.
      *
      * Note: The returned image may be resized down. However, both width and height must be
      * larger than the <code>targetSize</code>.
      */
     public static Bitmap decodeIfBigEnough(JobContext jc, byte[] data,
             Options options, int targetSize) {
         if (options == null) options = new Options();
         jc.setCancelListener(new DecodeCanceller(options));

         options.inJustDecodeBounds = true;
         BitmapFactory.decodeByteArray(data, 0, data.length, options);
         if (jc.isCancelled()) return null;
         if (options.outWidth < targetSize || options.outHeight < targetSize) {
             return null;
         }
         options.inSampleSize = BitmapUtils.computeSampleSizeLarger(
                 options.outWidth, options.outHeight, targetSize);
         options.inJustDecodeBounds = false;
         return ensureGLCompatibleBitmap(
                 BitmapFactory.decodeByteArray(data, 0, data.length, options));
     }

     // TODO: This function should not be called directly from
     // DecodeUtils.requestDecode(...), since we don't have the knowledge
     // if the bitmap will be uploaded to GL.
     public static Bitmap ensureGLCompatibleBitmap(Bitmap bitmap) {
         if (bitmap == null || bitmap.getConfig() != null) return bitmap;
         Bitmap newBitmap = bitmap.copy(Config.ARGB_8888, false);
         bitmap.recycle();
         return newBitmap;
     }

     public static BitmapRegionDecoder createBitmapRegionDecoder(
             JobContext jc, byte[] bytes, int offset, int length,
             boolean shareable) {
         if (offset < 0 || length <= 0 || offset + length > bytes.length) {
             throw new IllegalArgumentException(String.format(
                     "offset = %s, length = %s, bytes = %s",
                     offset, length, bytes.length));
         }

         try {
             return BitmapRegionDecoder.newInstance(
                     bytes, offset, length, shareable);
         } catch (Throwable t)  {
             Log.w(TAG, t);
             return null;
         }
     }

     public static BitmapRegionDecoder createBitmapRegionDecoder(
             JobContext jc, String filePath, boolean shareable) {
         try {
             return BitmapRegionDecoder.newInstance(filePath, shareable);
         } catch (Throwable t)  {
             Log.w(TAG, t);
             return null;
         }
     }

     public static BitmapRegionDecoder createBitmapRegionDecoder(
             JobContext jc, FileDescriptor fd, boolean shareable) {
         try {
             return BitmapRegionDecoder.newInstance(fd, shareable);
         } catch (Throwable t)  {
             Log.w(TAG, t);
             return null;
         }
     }

     public static BitmapRegionDecoder createBitmapRegionDecoder(
             JobContext jc, InputStream is, boolean shareable) {
         try {
             return BitmapRegionDecoder.newInstance(is, shareable);
         } catch (Throwable t)  {
             // We often cancel the creating of bitmap region decoder,
             // so just log one line.
             Log.w(TAG, "requestCreateBitmapRegionDecoder: " + t);
             return null;
         }
     }
 }
	/*
	* Copyright (C) 2010 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.data;

	import android.graphics.Bitmap;
	import android.graphics.Bitmap.Config;
	import android.graphics.BitmapFactory;
	import android.graphics.BitmapFactory.Options;
	import android.graphics.BitmapRegionDecoder;
	import android.util.FloatMath;

	import com.android.gallery3d.common.BitmapUtils;
	import com.android.gallery3d.common.Utils;
	import com.android.gallery3d.util.ThreadPool.CancelListener;
	import com.android.gallery3d.util.ThreadPool.JobContext;

	import java.io.FileDescriptor;
	import java.io.FileInputStream;
	import java.io.InputStream;

	public class DecodeUtils {
	private static final String TAG = "DecodeService";

	private static class DecodeCanceller implements CancelListener {
	Options mOptions;

	public DecodeCanceller(Options options) {
	mOptions = options;
	}

	@Override
	public void onCancel() {
	mOptions.requestCancelDecode();
	}
	}

	public static Bitmap decode(JobContext jc, FileDescriptor fd, Options options) {
	if (options == null) options = new Options();
	jc.setCancelListener(new DecodeCanceller(options));
	return ensureGLCompatibleBitmap(
	BitmapFactory.decodeFileDescriptor(fd, null, options));
	}

	public static void decodeBounds(JobContext jc, FileDescriptor fd,
	Options options) {
	Utils.assertTrue(options != null);
	options.inJustDecodeBounds = true;
	jc.setCancelListener(new DecodeCanceller(options));
	BitmapFactory.decodeFileDescriptor(fd, null, options);
	options.inJustDecodeBounds = false;
	}

	public static Bitmap decode(JobContext jc, byte[] bytes, Options options) {
	return decode(jc, bytes, 0, bytes.length, options);
	}

	public static Bitmap decode(JobContext jc, byte[] bytes, int offset,
	int length, Options options) {
	if (options == null) options = new Options();
	jc.setCancelListener(new DecodeCanceller(options));
	return ensureGLCompatibleBitmap(
	BitmapFactory.decodeByteArray(bytes, offset, length, options));
	}

	public static void decodeBounds(JobContext jc, byte[] bytes, int offset,
	int length, Options options) {
	Utils.assertTrue(options != null);
	options.inJustDecodeBounds = true;
	jc.setCancelListener(new DecodeCanceller(options));
	BitmapFactory.decodeByteArray(bytes, offset, length, options);
	options.inJustDecodeBounds = false;
	}

	public static Bitmap decodeThumbnail(
	JobContext jc, String filePath, Options options, int targetSize, int type) {
	FileInputStream fis = null;
	try {
	fis = new FileInputStream(filePath);
	FileDescriptor fd = fis.getFD();
	return decodeThumbnail(jc, fd, options, targetSize, type);
	} catch (Exception ex) {
	Log.w(TAG, ex);
	return null;
	} finally {
	Utils.closeSilently(fis);
	}
	}

	public static Bitmap decodeThumbnail(
	JobContext jc, FileDescriptor fd, Options options, int targetSize, int type) {
	if (options == null) options = new Options();
	jc.setCancelListener(new DecodeCanceller(options));

	options.inJustDecodeBounds = true;
	BitmapFactory.decodeFileDescriptor(fd, null, options);
	if (jc.isCancelled()) return null;

	int w = options.outWidth;
	int h = options.outHeight;

	if (type == MediaItem.TYPE_MICROTHUMBNAIL) {
	// We center-crop the original image as it's micro thumbnail. In this case,
	// we want to make sure the shorter side >= "targetSize".
	float scale = (float) targetSize / Math.min(w, h);
	options.inSampleSize = BitmapUtils.computeSampleSizeLarger(scale);

	// For an extremely wide image, e.g. 300x30000, we may got OOM when decoding
	// it for TYPE_MICROTHUMBNAIL. So we add a max number of pixels limit here.
	final int MAX_PIXEL_COUNT = 640000; // 400 x 1600
	if ((w / options.inSampleSize) * (h / options.inSampleSize) > MAX_PIXEL_COUNT) {
	options.inSampleSize = BitmapUtils.computeSampleSize(
	FloatMath.sqrt((float) MAX_PIXEL_COUNT / (w * h)));
	}
	} else {
	// For screen nail, we only want to keep the longer side >= targetSize.
	float scale = (float) targetSize / Math.max(w, h);
	options.inSampleSize = BitmapUtils.computeSampleSizeLarger(scale);
	}

	options.inJustDecodeBounds = false;

	Bitmap result = BitmapFactory.decodeFileDescriptor(fd, null, options);
	if (result == null) return null;

	// We need to resize down if the decoder does not support inSampleSize
	// (For example, GIF images)
	float scale = (float) targetSize / (type == MediaItem.TYPE_MICROTHUMBNAIL
	? Math.min(result.getWidth(), result.getHeight())
	: Math.max(result.getWidth(), result.getHeight()));

	if (scale <= 0.5) result = BitmapUtils.resizeBitmapByScale(result, scale, true);
	return ensureGLCompatibleBitmap(result);
	}

	/**
	* Decodes the bitmap from the given byte array if the image size is larger than the given
	* requirement.
	*
	* Note: The returned image may be resized down. However, both width and height must be
	* larger than the <code>targetSize</code>.
	*/
	public static Bitmap decodeIfBigEnough(JobContext jc, byte[] data,
	Options options, int targetSize) {
	if (options == null) options = new Options();
	jc.setCancelListener(new DecodeCanceller(options));

	options.inJustDecodeBounds = true;
	BitmapFactory.decodeByteArray(data, 0, data.length, options);
	if (jc.isCancelled()) return null;
	if (options.outWidth < targetSize \|\| options.outHeight < targetSize) {
	return null;
	}
	options.inSampleSize = BitmapUtils.computeSampleSizeLarger(
	options.outWidth, options.outHeight, targetSize);
	options.inJustDecodeBounds = false;
	return ensureGLCompatibleBitmap(
	BitmapFactory.decodeByteArray(data, 0, data.length, options));
	}

	// TODO: This function should not be called directly from
	// DecodeUtils.requestDecode(...), since we don't have the knowledge
	// if the bitmap will be uploaded to GL.
	public static Bitmap ensureGLCompatibleBitmap(Bitmap bitmap) {
	if (bitmap == null \|\| bitmap.getConfig() != null) return bitmap;
	Bitmap newBitmap = bitmap.copy(Config.ARGB_8888, false);
	bitmap.recycle();
	return newBitmap;
	}

	public static BitmapRegionDecoder createBitmapRegionDecoder(
	JobContext jc, byte[] bytes, int offset, int length,
	boolean shareable) {
	if (offset < 0 \|\| length <= 0 \|\| offset + length > bytes.length) {
	throw new IllegalArgumentException(String.format(
	"offset = %s, length = %s, bytes = %s",
	offset, length, bytes.length));
	}

	try {
	return BitmapRegionDecoder.newInstance(
	bytes, offset, length, shareable);
	} catch (Throwable t) {
	Log.w(TAG, t);
	return null;
	}
	}

	public static BitmapRegionDecoder createBitmapRegionDecoder(
	JobContext jc, String filePath, boolean shareable) {
	try {
	return BitmapRegionDecoder.newInstance(filePath, shareable);
	} catch (Throwable t) {
	Log.w(TAG, t);
	return null;
	}
	}

	public static BitmapRegionDecoder createBitmapRegionDecoder(
	JobContext jc, FileDescriptor fd, boolean shareable) {
	try {
	return BitmapRegionDecoder.newInstance(fd, shareable);
	} catch (Throwable t) {
	Log.w(TAG, t);
	return null;
	}
	}

	public static BitmapRegionDecoder createBitmapRegionDecoder(
	JobContext jc, InputStream is, boolean shareable) {
	try {
	return BitmapRegionDecoder.newInstance(is, shareable);
	} catch (Throwable t) {
	// We often cancel the creating of bitmap region decoder,
	// so just log one line.
	Log.w(TAG, "requestCreateBitmapRegionDecoder: " + t);
	return null;
	}
	}
	}