/*
 * Copyright (C) 2012 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.filtershow.filters;

import android.app.Activity;
import android.graphics.Bitmap;
import android.support.v8.renderscript.*;
import android.util.Log;

public class ImageFilterRS extends ImageFilter {
    private final String LOGTAG = "ImageFilterRS";

    private static RenderScript mRS = null;
    protected static Allocation mInPixelsAllocation;
    protected static Allocation mOutPixelsAllocation;
    private static android.content.res.Resources mResources = null;
    private static Bitmap sOldBitmap = null;
    private Bitmap mOldBitmap = null;

    private static Bitmap mReturnBitmap = null;
    private final Bitmap.Config mBitmapConfig = Bitmap.Config.ARGB_8888;

    public void prepare(Bitmap bitmap, float scaleFactor, boolean highQuality) {
        if (sOldBitmap == null
                || (bitmap.getWidth() != sOldBitmap.getWidth())
                || (bitmap.getHeight() != sOldBitmap.getHeight())) {
            if (mInPixelsAllocation != null) {
                mInPixelsAllocation.destroy();
            }
            if (mOutPixelsAllocation != null) {
                mOutPixelsAllocation.destroy();
            }
            Bitmap bitmapBuffer = bitmap.copy(mBitmapConfig, true);
            mOutPixelsAllocation = Allocation.createFromBitmap(mRS, bitmapBuffer,
                    Allocation.MipmapControl.MIPMAP_NONE, Allocation.USAGE_SCRIPT);
            mInPixelsAllocation = Allocation.createTyped(mRS,
                    mOutPixelsAllocation.getType());
            sOldBitmap = bitmap;
        }
        mInPixelsAllocation.copyFrom(bitmap);
        if (mOldBitmap != sOldBitmap) {
            createFilter(mResources, scaleFactor, highQuality);
            mOldBitmap = sOldBitmap;
        }
    }

    public void createFilter(android.content.res.Resources res,
            float scaleFactor, boolean highQuality) {
        // Stub
    }

    public void runFilter() {
        // Stub
    }

    public void update(Bitmap bitmap) {
        mOutPixelsAllocation.copyTo(bitmap);
    }

    @Override
    public Bitmap apply(Bitmap bitmap, float scaleFactor, boolean highQuality) {
        if (bitmap == null) {
            return bitmap;
        }
        try {
            prepare(bitmap, scaleFactor, highQuality);
            runFilter();
            update(bitmap);
        } catch (android.renderscript.RSIllegalArgumentException e) {
            Log.e(LOGTAG, "Illegal argument? " + e);
        } catch (android.renderscript.RSRuntimeException e) {
            Log.e(LOGTAG, "RS runtime exception ? " + e);
        }
        return bitmap;
    }

    public static RenderScript getRenderScriptContext() {
        return mRS;
    }

    public static void setRenderScriptContext(Activity context) {
        mRS = RenderScript.create(context);
        mResources = context.getResources();
    }

}