tools/layoutlib/bridge/src/android/graphics/BitmapFactory_Delegate.java

/*
 * Copyright (C) 2011 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 com.android.layoutlib.bridge.Bridge;
import com.android.layoutlib.bridge.impl.DelegateManager;
import com.android.ninepatch.NinePatchChunk;
import com.android.resources.Density;
import com.android.tools.layoutlib.annotations.LayoutlibDelegate;

import android.content.res.BridgeResources.NinePatchInputStream;
import android.graphics.BitmapFactory.Options;
import android.graphics.Bitmap_Delegate.BitmapCreateFlags;

import java.io.FileDescriptor;
import java.io.IOException;
import java.io.InputStream;
import java.util.EnumSet;
import java.util.Set;

/**
 * Delegate implementing the native methods of android.graphics.BitmapFactory
 *
 * Through the layoutlib_create tool, the original native methods of BitmapFactory have been
 * replaced by calls to methods of the same name in this delegate class.
 *
 * Because it's a stateless class to start with, there's no need to keep a {@link DelegateManager}
 * around to map int to instance of the delegate.
 *
 */
/*package*/ class BitmapFactory_Delegate {

    // ------ Native Delegates ------

    @LayoutlibDelegate
    /*package*/ static Bitmap nativeDecodeStream(InputStream is, byte[] storage,
            Rect padding, Options opts) {
        Bitmap bm = null;

        Density density = Density.MEDIUM;
        Set<BitmapCreateFlags> bitmapCreateFlags = EnumSet.of(BitmapCreateFlags.MUTABLE);
        if (opts != null) {
            density = Density.getEnum(opts.inDensity);
            if (opts.inPremultiplied) {
                bitmapCreateFlags.add(BitmapCreateFlags.PREMULTIPLIED);
            }
        }

        try {
            if (is instanceof NinePatchInputStream) {
                NinePatchInputStream npis = (NinePatchInputStream) is;
                npis.disableFakeMarkSupport();

                // load the bitmap as a nine patch
                com.android.ninepatch.NinePatch ninePatch = com.android.ninepatch.NinePatch.load(
                        npis, true /*is9Patch*/, false /*convert*/);

                // get the bitmap and chunk objects.
                bm = Bitmap_Delegate.createBitmap(ninePatch.getImage(), bitmapCreateFlags,
                        density);
                NinePatchChunk chunk = ninePatch.getChunk();

                // put the chunk in the bitmap
                bm.setNinePatchChunk(NinePatch_Delegate.serialize(chunk));

                // read the padding
                int[] paddingarray = chunk.getPadding();
                padding.left = paddingarray[0];
                padding.top = paddingarray[1];
                padding.right = paddingarray[2];
                padding.bottom = paddingarray[3];
            } else {
                // load the bitmap directly.
                bm = Bitmap_Delegate.createBitmap(is, bitmapCreateFlags, density);
            }
        } catch (IOException e) {
            Bridge.getLog().error(null,"Failed to load image" , e, null);
        }

        return bm;
    }

    @LayoutlibDelegate
    /*package*/ static Bitmap nativeDecodeFileDescriptor(FileDescriptor fd,
            Rect padding, Options opts) {
        opts.inBitmap = null;
        return null;
    }

    @LayoutlibDelegate
    /*package*/ static Bitmap nativeDecodeAsset(int asset, Rect padding, Options opts) {
        opts.inBitmap = null;
        return null;
    }

    @LayoutlibDelegate
    /*package*/ static Bitmap nativeDecodeByteArray(byte[] data, int offset,
            int length, Options opts) {
        opts.inBitmap = null;
        return null;
    }

    @LayoutlibDelegate
    /*package*/ static boolean nativeIsSeekable(FileDescriptor fd) {
        return true;
    }
}