diff options
Diffstat (limited to 'graphics')
| -rw-r--r-- | graphics/java/android/graphics/BitmapRegionDecoder.java | 263 |
1 files changed, 0 insertions, 263 deletions
diff --git a/graphics/java/android/graphics/BitmapRegionDecoder.java b/graphics/java/android/graphics/BitmapRegionDecoder.java deleted file mode 100644 index 454eb4a..0000000 --- a/graphics/java/android/graphics/BitmapRegionDecoder.java +++ /dev/null @@ -1,263 +0,0 @@ -/* 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 android.graphics; - -import android.content.res.AssetManager; - -import java.io.BufferedInputStream; -import java.io.FileDescriptor; -import java.io.FileInputStream; -import java.io.IOException; -import java.io.InputStream; - -/** - * BitmapRegionDecoder can be used to decode a rectangle region from an image. - * BitmapRegionDecoder is particularly useful when an original image is large and - * you only need parts of the image. - * - * <p>To create a BitmapRegionDecoder, call newInstance(...). - * Given a BitmapRegionDecoder, users can call decodeRegion() repeatedly - * to get a decoded Bitmap of the specified region. - * - */ -public final class BitmapRegionDecoder { - private int mNativeBitmapRegionDecoder; - private boolean mRecycled; - - /** - * Create a BitmapRegionDecoder from the specified byte array. - * Currently only the Jpeg format is supported. - * - * @param data byte array of compressed image data. - * @param offset offset into data for where the decoder should begin - * parsing. - * @param length the number of bytes, beginning at offset, to parse - * @param isShareable If this is true, then the BitmapRegionDecoder may keep a - * shallow reference to the input. If this is false, - * then the BitmapRegionDecoder will explicitly make a copy of the - * input data, and keep that. Even if sharing is allowed, - * the implementation may still decide to make a deep - * copy of the input data. If an image is progressively encoded, - * allowing sharing may degrade the decoding speed. - * @return BitmapRegionDecoder, or null if the image data could not be decoded. - * @throws IOException if the image format is not supported or can not be decoded. - */ - public static BitmapRegionDecoder newInstance(byte[] data, - int offset, int length, boolean isShareable) throws IOException { - if ((offset | length) < 0 || data.length < offset + length) { - throw new ArrayIndexOutOfBoundsException(); - } - return nativeNewInstance(data, offset, length, isShareable); - } - - /** - * Create a BitmapRegionDecoder from the file descriptor. - * The position within the descriptor will not be changed when - * this returns, so the descriptor can be used again as is. - * Currently only the Jpeg format is supported. - * - * @param fd The file descriptor containing the data to decode - * @param isShareable If this is true, then the BitmapRegionDecoder may keep a - * shallow reference to the input. If this is false, - * then the BitmapRegionDecoder will explicitly make a copy of the - * input data, and keep that. Even if sharing is allowed, - * the implementation may still decide to make a deep - * copy of the input data. If an image is progressively encoded, - * allowing sharing may degrade the decoding speed. - * @return BitmapRegionDecoder, or null if the image data could not be decoded. - * @throws IOException if the image format is not supported or can not be decoded. - */ - public static BitmapRegionDecoder newInstance( - FileDescriptor fd, boolean isShareable) throws IOException { - return nativeNewInstance(fd, isShareable); - } - - /** - * Create a BitmapRegionDecoder from an input stream. - * The stream's position will be where ever it was after the encoded data - * was read. - * Currently only the Jpeg format is supported. - * - * @param is The input stream that holds the raw data to be decoded into a - * BitmapRegionDecoder. - * @param isShareable If this is true, then the BitmapRegionDecoder may keep a - * shallow reference to the input. If this is false, - * then the BitmapRegionDecoder will explicitly make a copy of the - * input data, and keep that. Even if sharing is allowed, - * the implementation may still decide to make a deep - * copy of the input data. If an image is progressively encoded, - * allowing sharing may degrade the decoding speed. - * @return BitmapRegionDecoder, or null if the image data could not be decoded. - * @throws IOException if the image format is not supported or can not be decoded. - */ - public static BitmapRegionDecoder newInstance(InputStream is, - boolean isShareable) throws IOException { - // we need mark/reset to work properly in JNI - - if (!is.markSupported()) { - is = new BufferedInputStream(is, 16 * 1024); - } - - if (is instanceof AssetManager.AssetInputStream) { - return nativeNewInstance( - ((AssetManager.AssetInputStream) is).getAssetInt(), - isShareable); - } else { - // pass some temp storage down to the native code. 1024 is made up, - // but should be large enough to avoid too many small calls back - // into is.read(...). - byte [] tempStorage = new byte[16 * 1024]; - return nativeNewInstance(is, tempStorage, isShareable); - } - } - - /** - * Create a BitmapRegionDecoder from a file path. - * Currently only the Jpeg format is supported. - * - * @param pathName complete path name for the file to be decoded. - * @param isShareable If this is true, then the BitmapRegionDecoder may keep a - * shallow reference to the input. If this is false, - * then the BitmapRegionDecoder will explicitly make a copy of the - * input data, and keep that. Even if sharing is allowed, - * the implementation may still decide to make a deep - * copy of the input data. If an image is progressively encoded, - * allowing sharing may degrade the decoding speed. - * @return BitmapRegionDecoder, or null if the image data could not be decoded. - * @throws IOException if the image format is not supported or can not be decoded. - */ - public static BitmapRegionDecoder newInstance(String pathName, - boolean isShareable) throws IOException { - BitmapRegionDecoder decoder = null; - InputStream stream = null; - - try { - stream = new FileInputStream(pathName); - decoder = newInstance(stream, isShareable); - } finally { - if (stream != null) { - try { - stream.close(); - } catch (IOException e) { - // do nothing here - } - } - } - return decoder; - } - - /* Private constructor that must receive an already allocated native - region decoder int (pointer). - - This can be called from JNI code. - */ - private BitmapRegionDecoder(int decoder) { - mNativeBitmapRegionDecoder = decoder; - mRecycled = false; - } - - /** - * Decodes a rectangle region in the image specified by rect. - * - * @param rect The rectangle that specified the region to be decode. - * @param options null-ok; Options that control downsampling. - * inPurgeable is not supported. - * @return The decoded bitmap, or null if the image data could not be - * decoded. - */ - public Bitmap decodeRegion(Rect rect, BitmapFactory.Options options) { - checkRecycled("decodeRegion called on recycled region decoder"); - if (rect.left < 0 || rect.top < 0 || rect.right > getWidth() - || rect.bottom > getHeight()) - throw new IllegalArgumentException("rectangle is not inside the image"); - return nativeDecodeRegion(mNativeBitmapRegionDecoder, rect.left, rect.top, - rect.right - rect.left, rect.bottom - rect.top, options); - } - - /** Returns the original image's width */ - public int getWidth() { - checkRecycled("getWidth called on recycled region decoder"); - return nativeGetWidth(mNativeBitmapRegionDecoder); - } - - /** Returns the original image's height */ - public int getHeight() { - checkRecycled("getHeight called on recycled region decoder"); - return nativeGetHeight(mNativeBitmapRegionDecoder); - } - - /** - * Frees up the memory associated with this region decoder, and mark the - * region decoder as "dead", meaning it will throw an exception if decodeRegion(), - * getWidth() or getHeight() is called. - * - * <p>This operation cannot be reversed, so it should only be called if you are - * sure there are no further uses for the region decoder. This is an advanced call, - * and normally need not be called, since the normal GC process will free up this - * memory when there are no more references to this region decoder. - */ - public void recycle() { - if (!mRecycled) { - nativeClean(mNativeBitmapRegionDecoder); - mRecycled = true; - } - } - - /** - * Returns true if this region decoder has been recycled. - * If so, then it is an error to try use its method. - * - * @return true if the region decoder has been recycled - */ - public final boolean isRecycled() { - return mRecycled; - } - - /** - * Called by methods that want to throw an exception if the region decoder - * has already been recycled. - */ - private void checkRecycled(String errorMessage) { - if (mRecycled) { - throw new IllegalStateException(errorMessage); - } - } - - @Override - protected void finalize() throws Throwable { - try { - recycle(); - } finally { - super.finalize(); - } - } - - private static native Bitmap nativeDecodeRegion(int lbm, - int start_x, int start_y, int width, int height, - BitmapFactory.Options options); - private static native int nativeGetWidth(int lbm); - private static native int nativeGetHeight(int lbm); - private static native void nativeClean(int lbm); - - private static native BitmapRegionDecoder nativeNewInstance( - byte[] data, int offset, int length, boolean isShareable); - private static native BitmapRegionDecoder nativeNewInstance( - FileDescriptor fd, boolean isShareable); - private static native BitmapRegionDecoder nativeNewInstance( - InputStream is, byte[] storage, boolean isShareable); - private static native BitmapRegionDecoder nativeNewInstance( - int asset, boolean isShareable); -} |