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authorWei-Ta Chen <weita@google.com>2011-01-13 12:06:38 -0800
committerAndroid Git Automerger <android-git-automerger@android.com>2011-01-13 12:06:38 -0800
commit62cd5c9788abbd5b715ec2a6eaf64dd3945fdbaf (patch)
treee28d59367c753543283623d54d9c43f301913162 /graphics
parent1dac4cdd6faba15426a0b37a7a615c04f5a35394 (diff)
parent61d9ffbfd86dfe6bacce431b8ed9eebe1cfd8178 (diff)
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am 61d9ffbf: Merge "Do not merge." into gingerbread
* commit '61d9ffbfd86dfe6bacce431b8ed9eebe1cfd8178': Do not merge.
Diffstat (limited to 'graphics')
-rw-r--r--graphics/java/android/graphics/BitmapFactory.java10
-rw-r--r--graphics/java/android/graphics/BitmapRegionDecoder.java263
2 files changed, 273 insertions, 0 deletions
diff --git a/graphics/java/android/graphics/BitmapFactory.java b/graphics/java/android/graphics/BitmapFactory.java
index 7b49bc5..3f1a566 100644
--- a/graphics/java/android/graphics/BitmapFactory.java
+++ b/graphics/java/android/graphics/BitmapFactory.java
@@ -206,10 +206,20 @@ public class BitmapFactory {
public boolean inNativeAlloc;
/**
+ * If inPreferQualityOverSpeed is set to true, the decoder will try to
+ * decode the reconstructed image to a higher quality even at the
+ * expense of the decoding speed. Currently the field only affects JPEG
+ * decode, in the case of which a more accurate, but slightly slower,
+ * IDCT method will be used instead.
+ */
+ public boolean inPreferQualityOverSpeed;
+
+ /**
* The resulting width of the bitmap, set independent of the state of
* inJustDecodeBounds. However, if there is an error trying to decode,
* outWidth will be set to -1.
*/
+
public int outWidth;
/**
diff --git a/graphics/java/android/graphics/BitmapRegionDecoder.java b/graphics/java/android/graphics/BitmapRegionDecoder.java
new file mode 100644
index 0000000..496e0c7
--- /dev/null
+++ b/graphics/java/android/graphics/BitmapRegionDecoder.java
@@ -0,0 +1,263 @@
+/* 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 and PNG formats are 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 and PNG formats are 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 and PNG formats are 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 and PNG formats are 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);
+}