project_files/Android-build/SDL-android-project/src/org/hedgewars/hedgeroid/MapPreviewGenerator.java
author Wuzzy <Wuzzy2@mail.ru>
Thu, 30 Aug 2018 22:07:01 +0200
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permissions -rw-r--r--
BRW now allows weapon scheme customization See script comments to see how.
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/*
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 * Hedgewars for Android. An Android port of Hedgewars, a free turn based strategy game
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 * Copyright (C) 2012 Simeon Maxein <smaxein@googlemail.com>
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 *
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 * This program is free software; you can redistribute it and/or
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 * modify it under the terms of the GNU General Public License
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 * as published by the Free Software Foundation; either version 2
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 * of the License, or (at your option) any later version.
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 *
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 * This program is distributed in the hope that it will be useful,
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 * but WITHOUT ANY WARRANTY; without even the implied warranty of
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 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
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 * GNU General Public License for more details.
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 *
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 * You should have received a copy of the GNU General Public License
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 * along with this program; if not, write to the Free Software
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 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
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 */
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package org.hedgewars.hedgeroid;
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import java.io.File;
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import java.io.FileNotFoundException;
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import org.hedgewars.hedgeroid.Datastructures.MapFile;
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import org.hedgewars.hedgeroid.Datastructures.MapRecipe;
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import org.hedgewars.hedgeroid.EngineProtocol.PascalExports;
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import org.hedgewars.hedgeroid.frontlib.Flib;
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import org.hedgewars.hedgeroid.frontlib.Frontlib;
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import org.hedgewars.hedgeroid.frontlib.Frontlib.ByteArrayPtr;
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import org.hedgewars.hedgeroid.frontlib.Frontlib.MapRecipePtr;
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import org.hedgewars.hedgeroid.frontlib.Frontlib.MapconnPtr;
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import org.hedgewars.hedgeroid.frontlib.Frontlib.MapimageCallback;
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import org.hedgewars.hedgeroid.frontlib.Frontlib.StrCallback;
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import org.hedgewars.hedgeroid.util.FileUtils;
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import android.content.Context;
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import android.graphics.Bitmap;
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import android.graphics.Bitmap.Config;
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import android.graphics.Color;
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import android.graphics.drawable.BitmapDrawable;
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import android.graphics.drawable.Drawable;
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import android.os.Handler;
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import android.os.Looper;
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import android.util.Log;
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import com.sun.jna.Pointer;
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/**
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 * A class that asynchronously generates a map preview from a MapRecipe.
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 *
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 * For named maps, this will load the preview image from the filesystem. For others,
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 * it will call the Hedgewars engine to generate a preview image. The result is sent
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 * back to a listener on the UI thread.
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 */
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public final class MapPreviewGenerator implements Runnable {
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    private static final String TAG = MapPreviewGenerator.class.getSimpleName();
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    private static final Handler mainHandler = new Handler(Looper.getMainLooper());
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    private static final long TIMEOUT_NS = 20l * 1000 * 1000 * 1000;
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    private final Context appContext;
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    private final MapRecipe map;
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    private final Listener listener;
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    private boolean resultAvailable;
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    private Drawable result;
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    public static interface Listener {
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        /**
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         * This is called on the UI thread once the preview is ready or failed.
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         * In case of failure, null is passed.
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         */
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        void onMapPreviewResult(Drawable preview);
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    }
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    private MapPreviewGenerator(Context appContext, MapRecipe map, Listener listener) {
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        this.appContext = appContext;
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        this.map = map;
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        this.listener = listener;
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    }
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    public void run() {
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        if (map.mapgen == Frontlib.MAPGEN_NAMED) {
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            postToListener(loadPreviewFromFile(appContext, map.name));
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        } else {
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            resultAvailable = false;
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            result = null;
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            MapconnPtr conn = Flib.INSTANCE.flib_mapconn_create(MapRecipePtr.createJavaOwned(map));
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            if (conn == null) {
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                postToListener(null);
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                return;
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            }
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            try {
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                int port = Flib.INSTANCE.flib_mapconn_getport(conn);
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                Flib.INSTANCE.flib_mapconn_onSuccess(conn, successCb, null);
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                Flib.INSTANCE.flib_mapconn_onFailure(conn, failureCb, null);
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                String configPath;
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                try {
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                    configPath = FileUtils.getCachePath(appContext).getAbsolutePath();
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                } catch(FileNotFoundException e) {
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                    return;
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                }
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                startEngine(configPath, port);
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                long startTime = System.nanoTime();
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                do {
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                    Flib.INSTANCE.flib_mapconn_tick(conn);
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                    try {
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                        Thread.sleep(50);
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                    } catch (InterruptedException e) {
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                        // ignore
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                    }
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                    if(System.nanoTime()-startTime > TIMEOUT_NS) {
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                        Log.w(TAG, "Error generating map preview: timeout");
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                        resultAvailable = true;
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                    }
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                } while(!resultAvailable);
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            } finally {
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                Flib.INSTANCE.flib_mapconn_destroy(conn);
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                postToListener(result);
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            }
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        }
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    }
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    public static void startPreviewGeneration(Context appContext, MapRecipe map, Listener listener) {
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        new Thread(new MapPreviewGenerator(appContext, map, listener)).start();
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    }
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    private static Drawable loadPreviewFromFile(Context appContext, String mapName) {
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        if(!mapName.startsWith("+")) {
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            try {
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                File previewFile = MapFile.getPreviewFile(appContext, mapName);
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                return Drawable.createFromPath(previewFile.getAbsolutePath());
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            } catch (FileNotFoundException e) {
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                Log.w("MapPreviewGenerator", "Preview for map "+mapName+" not found.");
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            }
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        }
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        return null;
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    }
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    private static void startEngine(final String configPath, final int port) {
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        new Thread(new Runnable() {
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            public void run() {
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                Log.d(TAG, "Starting engine "+port);
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                PascalExports.synchronizedGenLandPreview(port);
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                Log.d(TAG, "Engine finished");
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            }
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        }).start();
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    }
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    private void postToListener(final Drawable result) {
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        mainHandler.post(new Runnable() {
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            public void run() {
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                listener.onMapPreviewResult(result);
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            }
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        });
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    }
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    /**
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     * Let's be extra nice here and clip off the left and right sides, so the preview is centered...
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     * Since the image is present in bytes, we can save some effort by checking entire byte-columns first.
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     */
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    private final MapimageCallback successCb = new MapimageCallback() {
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        public void callback(Pointer context, ByteArrayPtr buffer, int hedgehogCount) {
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            byte[] mapdata = buffer.deref(Frontlib.MAPIMAGE_BYTES);
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            int leftmostPixel = Frontlib.MAPIMAGE_WIDTH;
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            int rightmostPixel = -1;
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            int bytesPerLine = Frontlib.MAPIMAGE_WIDTH/8;
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            // Find the leftmost pixel
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            for(int xbyte=0; xbyte<bytesPerLine; xbyte++) {
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                for(int y=0; y<Frontlib.MAPIMAGE_HEIGHT; y++) {
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                    int b = 0xff&mapdata[xbyte+y*bytesPerLine];
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                    if(b != 0) {
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                        leftmostPixel = Math.min(leftmostPixel, Integer.numberOfLeadingZeros(b)-24+xbyte*8);
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                    }
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                }
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                if(leftmostPixel!=Frontlib.MAPIMAGE_WIDTH) break;
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            }
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            // Find the rightmost pixel
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            for(int xbyte=bytesPerLine-1; xbyte>=0; xbyte--) {
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                for(int y=0; y<Frontlib.MAPIMAGE_HEIGHT; y++) {
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                    int b = mapdata[xbyte+y*bytesPerLine];
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                    if(b != 0) {
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                        rightmostPixel = Math.max(rightmostPixel, xbyte*8+7-Integer.numberOfTrailingZeros(b));
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                    }
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                }
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                if(rightmostPixel!=-1) break;
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            }
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            // No pixel was set at all -> use default width
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            if(rightmostPixel==-1) {
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                leftmostPixel = 0;
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                rightmostPixel = Frontlib.MAPIMAGE_WIDTH-1;
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            }
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            Bitmap bitmap = Bitmap.createBitmap(rightmostPixel-leftmostPixel+1, Frontlib.MAPIMAGE_HEIGHT, Config.ARGB_8888);
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            for(int y=0; y<Frontlib.MAPIMAGE_HEIGHT; y++) {
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                for(int x=0; x<bitmap.getWidth(); x++) {
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                    bitmap.setPixel(x, y, isPixelSet(mapdata, x+leftmostPixel, y) ? Color.YELLOW : Color.TRANSPARENT);
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                }
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            }
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            result = new BitmapDrawable(bitmap);
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            resultAvailable = true;
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        }
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    };
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    private static boolean isPixelSet(byte[] imgdata, int x, int y) {
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        int pixelnum = x+Frontlib.MAPIMAGE_WIDTH*y;
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        return (imgdata[pixelnum>>3] & (128>>(pixelnum&7))) != 0;
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    }
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    private final StrCallback failureCb = new StrCallback() {
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        public void callback(Pointer context, String reason) {
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            Log.w(TAG, "Error generating map preview: "+reason);
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            result = null;
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            resultAvailable = true;
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        }
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    };
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763d3961400b Hedgeroid: Frantic scrabbling toward the deadline
Medo <smaxein@googlemail.com>
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}