1 files changed, 128 insertions, 0 deletions
diff --git a/graphics/java/android/graphics/LargeBitmap.java b/graphics/java/android/graphics/LargeBitmap.java
new file mode 100644
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+++ b/graphics/java/android/graphics/LargeBitmap.java
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+/*
+ * Copyright (C) 2006 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.os.Parcel;
+import android.os.Parcelable;
+import android.util.DisplayMetrics;
+
+import java.io.OutputStream;
+import java.nio.Buffer;
+import java.nio.ByteBuffer;
+import java.nio.IntBuffer;
+import java.nio.ShortBuffer;
+
+/**
+ * LargeBitmap can be used to decode a rectangle region from an image.
+ * LargeBimap is particularly useful when an original image is large and
+ * you only need parts of the image.
+ *
+ * To create a LargeBitmap, call BitmapFactory.createLargeBitmap().
+ * Given a LargeBitmap, users can call decodeRegion() repeatedly
+ * to get a decoded Bitmap of the specified region.
+ * @hide
+ */
+public final class LargeBitmap {
+    private int mNativeLargeBitmap;
+    private boolean mRecycled;
+
+    /*  Private constructor that must received an already allocated native
+        large bitmap int (pointer).
+
+        This can be called from JNI code.
+    */
+    private LargeBitmap(int lbm) {
+        mNativeLargeBitmap = lbm;
+        mRecycled = false;
+    }
+
+    /**
+     * Decodes a rectangle region in the image specified by rect.
+     *
+     * @param rect The rectangle that specified the region to be decode.
+     * @param opts 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 large bitmap");
+        if (rect.left < 0 || rect.top < 0 || rect.right > getWidth() || rect.bottom > getHeight())
+            throw new IllegalArgumentException("rectangle is not inside the image");
+        return nativeDecodeRegion(mNativeLargeBitmap, 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 large bitmap");
+        return nativeGetWidth(mNativeLargeBitmap);
+    }
+
+    /** Returns the original image's height */
+    public int getHeight() {
+        checkRecycled("getHeight called on recycled large bitmap");
+        return nativeGetHeight(mNativeLargeBitmap);
+    }
+
+    /**
+     * Frees up the memory associated with this large bitmap, and mark the
+     * large bitmap as "dead", meaning it will throw an exception if decodeRegion(),
+     * getWidth() or getHeight() is called.
+     * This operation cannot be reversed, so it should only be called if you are
+     * sure there are no further uses for the large bitmap. 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 bitmap.
+     */
+    public void recycle() {
+        if (!mRecycled) {
+            nativeClean(mNativeLargeBitmap);
+            mRecycled = true;
+        }
+    }
+
+    /**
+     * Returns true if this large bitmap has been recycled.
+     * If so, then it is an error to try use its method.
+     *
+     * @return true if the large bitmap has been recycled
+     */
+    public final boolean isRecycled() {
+        return mRecycled;
+    }
+
+    /**
+     * Called by methods that want to throw an exception if the bitmap
+     * has already been recycled.
+     */
+    private void checkRecycled(String errorMessage) {
+        if (mRecycled) {
+            throw new IllegalStateException(errorMessage);
+        }
+    }
+
+    protected void finalize() {
+        recycle();
+    }
+
+    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);
+}