src/com/android/gallery3d/filtershow/filters/ImageFilterTinyPlanet.java

/*
 * 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.graphics.Bitmap;
import android.graphics.Canvas;
import android.graphics.Paint;
import android.graphics.Rect;
import android.graphics.RectF;

import com.adobe.xmp.XMPException;
import com.adobe.xmp.XMPMeta;
import com.android.gallery3d.app.Log;
import com.android.gallery3d.filtershow.presets.ImagePreset;

/**
 * An image filter which creates a tiny planet projection.
 */
public class ImageFilterTinyPlanet extends SimpleImageFilter {


    private static final String LOGTAG = ImageFilterTinyPlanet.class.getSimpleName();
    public static final String GOOGLE_PANO_NAMESPACE = "http://ns.google.com/photos/1.0/panorama/";
    FilterTinyPlanetRepresentation mParameters = new FilterTinyPlanetRepresentation();

    public static final String CROPPED_AREA_IMAGE_WIDTH_PIXELS =
            "CroppedAreaImageWidthPixels";
    public static final String CROPPED_AREA_IMAGE_HEIGHT_PIXELS =
            "CroppedAreaImageHeightPixels";
    public static final String CROPPED_AREA_FULL_PANO_WIDTH_PIXELS =
            "FullPanoWidthPixels";
    public static final String CROPPED_AREA_FULL_PANO_HEIGHT_PIXELS =
            "FullPanoHeightPixels";
    public static final String CROPPED_AREA_LEFT =
            "CroppedAreaLeftPixels";
    public static final String CROPPED_AREA_TOP =
            "CroppedAreaTopPixels";

    public ImageFilterTinyPlanet() {
        mName = "TinyPlanet";
    }

    @Override
    public void useRepresentation(FilterRepresentation representation) {
        FilterTinyPlanetRepresentation parameters = (FilterTinyPlanetRepresentation) representation;
        mParameters = parameters;
    }

    @Override
    public FilterRepresentation getDefaultRepresentation() {
        return new FilterTinyPlanetRepresentation();
    }


    native protected void nativeApplyFilter(
            Bitmap bitmapIn, int width, int height, Bitmap bitmapOut, int outSize, float scale,
            float angle);


    @Override
    public Bitmap apply(Bitmap bitmapIn, float scaleFactor, int quality) {
        int w = bitmapIn.getWidth();
        int h = bitmapIn.getHeight();
        int outputSize = (int) (w / 2f);
        ImagePreset preset = getImagePreset();
        Bitmap mBitmapOut = null;
        if (preset != null) {
            XMPMeta xmp = preset.getImageLoader().getXmpObject();
            // Do nothing, just use bitmapIn as is if we don't have XMP.
            if(xmp != null) {
                bitmapIn = applyXmp(bitmapIn, xmp, w);
            }
        }
        if (mBitmapOut != null) {
            if (outputSize != mBitmapOut.getHeight()) {
                mBitmapOut = null;
            }
        }
        while (mBitmapOut == null) {
            try {
                mBitmapOut = getEnvironment().getBitmap(outputSize, outputSize);
            } catch (java.lang.OutOfMemoryError e) {
                System.gc();
                outputSize /= 2;
                Log.v(LOGTAG, "No memory to create Full Tiny Planet create half");
            }
        }
        nativeApplyFilter(bitmapIn, bitmapIn.getWidth(), bitmapIn.getHeight(), mBitmapOut,
                outputSize, mParameters.getZoom() / 100f, mParameters.getAngle());

        return mBitmapOut;
    }

    private Bitmap applyXmp(Bitmap bitmapIn, XMPMeta xmp, int intermediateWidth) {
        try {
            int croppedAreaWidth =
                    getInt(xmp, CROPPED_AREA_IMAGE_WIDTH_PIXELS);
            int croppedAreaHeight =
                    getInt(xmp, CROPPED_AREA_IMAGE_HEIGHT_PIXELS);
            int fullPanoWidth =
                    getInt(xmp, CROPPED_AREA_FULL_PANO_WIDTH_PIXELS);
            int fullPanoHeight =
                    getInt(xmp, CROPPED_AREA_FULL_PANO_HEIGHT_PIXELS);
            int left = getInt(xmp, CROPPED_AREA_LEFT);
            int top = getInt(xmp, CROPPED_AREA_TOP);

            if (fullPanoWidth == 0 || fullPanoHeight == 0) {
                return bitmapIn;
            }
            // Make sure the intermediate image has the similar size to the
            // input.
            Bitmap paddedBitmap = null;
            float scale = intermediateWidth / (float) fullPanoWidth;
            while (paddedBitmap == null) {
                try {
                    paddedBitmap = Bitmap.createBitmap(
                            (int) (fullPanoWidth * scale), (int) (fullPanoHeight * scale),
                            Bitmap.Config.ARGB_8888);
                } catch (java.lang.OutOfMemoryError e) {
                    System.gc();
                    scale /= 2;
                }
            }
            Canvas paddedCanvas = new Canvas(paddedBitmap);

            int right = left + croppedAreaWidth;
            int bottom = top + croppedAreaHeight;
            RectF destRect = new RectF(left * scale, top * scale, right * scale, bottom * scale);
            paddedCanvas.drawBitmap(bitmapIn, null, destRect, null);
            bitmapIn = paddedBitmap;
        } catch (XMPException ex) {
            // Do nothing, just use bitmapIn as is.
        }
        return bitmapIn;
    }

    private static int getInt(XMPMeta xmp, String key) throws XMPException {
        if (xmp.doesPropertyExist(GOOGLE_PANO_NAMESPACE, key)) {
            return xmp.getPropertyInteger(GOOGLE_PANO_NAMESPACE, key);
        } else {
            return 0;
        }
    }
}