MBTiles raster tile source (#708)
This commit is contained in:
Andrea Antonello
Emux
@@ -0,0 +1,228 @@
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/*
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* Copyright 2019 Andrea Antonello
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* Copyright 2019 devemux86
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*
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* This program is free software: you can redistribute it and/or modify it under the
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* terms of the GNU Lesser General Public License as published by the Free Software
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* Foundation, either version 3 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, but WITHOUT ANY
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* WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A
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* PARTICULAR PURPOSE. See the GNU Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public License along with
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* this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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package org.oscim.android.tiling.source.mbtiles;
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import android.database.Cursor;
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import android.database.sqlite.SQLiteDatabase;
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import android.graphics.BitmapFactory;
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import android.graphics.Canvas;
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import android.graphics.Color;
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import android.graphics.Paint;
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import org.oscim.backend.CanvasAdapter;
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import org.oscim.backend.canvas.Bitmap;
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import org.oscim.core.BoundingBox;
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import org.oscim.core.MercatorProjection;
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import org.oscim.layers.tile.MapTile;
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import org.oscim.map.Viewport;
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import org.oscim.tiling.ITileDataSink;
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import org.oscim.tiling.ITileDataSource;
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import org.oscim.tiling.QueryResult;
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import org.slf4j.Logger;
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import org.slf4j.LoggerFactory;
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import java.io.ByteArrayInputStream;
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import java.io.ByteArrayOutputStream;
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import java.util.HashMap;
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import java.util.Map;
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/**
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* A tile data source for MBTiles raster databases.
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*/
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public class MBTilesBitmapTileDataSource implements ITileDataSource {
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private static final Logger log = LoggerFactory.getLogger(MBTilesBitmapTileDataSource.class);
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private static final String TABLE_TILES = "tiles";
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private static final String COL_TILES_ZOOM_LEVEL = "zoom_level";
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private static final String COL_TILES_TILE_COLUMN = "tile_column";
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private static final String COL_TILES_TILE_ROW = "tile_row";
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private static final String COL_TILES_TILE_DATA = "tile_data";
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private static final String SELECT_TILES = "SELECT " + COL_TILES_TILE_DATA + " from " + TABLE_TILES + " where "
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+ COL_TILES_ZOOM_LEVEL + "=? AND " + COL_TILES_TILE_COLUMN + "=? AND " + COL_TILES_TILE_ROW + "=?";
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private static final String TABLE_METADATA = "metadata";
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private static final String COL_METADATA_NAME = "name";
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private static final String COL_METADATA_VALUE = "value";
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private static final String SELECT_METADATA = "select " + COL_METADATA_NAME + "," + COL_METADATA_VALUE + " from "
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+ TABLE_METADATA;
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private final Integer mAlpha;
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private final SQLiteDatabase mDatabase;
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private Map<String, String> mMetadata;
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private final Integer mTransparentColor;
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/**
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* Create a MBTiles tile data source.
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*
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* @param path the path to the MBTiles database.
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* @param alpha an optional alpha value [0-255] to make the tiles transparent.
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* @param transparentColor an optional color that will be made transparent in the bitmap.
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*/
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MBTilesBitmapTileDataSource(String path, Integer alpha, Integer transparentColor) {
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mDatabase = SQLiteDatabase.openDatabase(path, null, SQLiteDatabase.OPEN_READONLY);
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mAlpha = alpha;
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mTransparentColor = transparentColor;
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}
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@Override
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public void cancel() {
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mDatabase.close();
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}
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@Override
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public void dispose() {
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mDatabase.close();
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}
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String getAttribution() {
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return getMetadata().get("attribution");
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}
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BoundingBox getBounds() {
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String bounds = getMetadata().get("bounds");
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if (bounds != null) {
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String[] split = bounds.split(",");
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double w = Double.parseDouble(split[0]);
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double s = Double.parseDouble(split[1]);
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double e = Double.parseDouble(split[2]);
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double n = Double.parseDouble(split[3]);
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return new BoundingBox(s, w, n, e);
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}
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return null;
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}
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public String getDescription() {
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return getMetadata().get("description");
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}
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/**
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* @return the image format (jpg, png)
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*/
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public String getFormat() {
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return getMetadata().get("format");
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}
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int getMaxZoom() {
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String maxZoom = getMetadata().get("maxzoom");
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if (maxZoom != null)
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return Integer.parseInt(maxZoom);
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return Viewport.MAX_ZOOM_LEVEL;
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}
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private Map<String, String> getMetadata() {
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if (mMetadata == null) {
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mMetadata = new HashMap<>();
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Cursor cursor = null;
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try {
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cursor = mDatabase.rawQuery(SELECT_METADATA, null);
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while (cursor.moveToNext()) {
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String key = cursor.getString(0);
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String value = cursor.getString(1);
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mMetadata.put(key, value);
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}
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} finally {
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if (cursor != null)
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cursor.close();
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}
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}
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return mMetadata;
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}
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int getMinZoom() {
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String minZoom = getMetadata().get("minzoom");
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if (minZoom != null)
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return Integer.parseInt(minZoom);
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return Viewport.MIN_ZOOM_LEVEL;
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}
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String getName() {
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return getMetadata().get("name");
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}
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public String getVersion() {
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return getMetadata().get("version");
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}
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private static android.graphics.Bitmap processAlpha(android.graphics.Bitmap bitmap, int alpha) {
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android.graphics.Bitmap newBitmap = android.graphics.Bitmap.createBitmap(bitmap.getWidth(), bitmap.getHeight(), android.graphics.Bitmap.Config.ARGB_8888);
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Canvas canvas = new Canvas(newBitmap);
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Paint paint = new Paint();
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paint.setAlpha(alpha);
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canvas.drawBitmap(bitmap, 0, 0, paint);
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return newBitmap;
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}
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private static android.graphics.Bitmap processTransparentColor(android.graphics.Bitmap bitmap, int colorToRemove) {
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int[] pixels = new int[bitmap.getWidth() * bitmap.getHeight()];
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bitmap.getPixels(pixels, 0, bitmap.getWidth(), 0, 0, bitmap.getWidth(), bitmap.getHeight());
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for (int i = 0; i < pixels.length; i++) {
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if (pixels[i] == colorToRemove)
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pixels[i] = Color.alpha(Color.TRANSPARENT);
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}
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android.graphics.Bitmap newBitmap = android.graphics.Bitmap.createBitmap(bitmap.getWidth(), bitmap.getHeight(), android.graphics.Bitmap.Config.ARGB_8888);
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newBitmap.setPixels(pixels, 0, newBitmap.getWidth(), 0, 0, newBitmap.getWidth(), newBitmap.getHeight());
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return newBitmap;
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}
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@Override
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public void query(MapTile tile, ITileDataSink sink) {
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QueryResult res = QueryResult.FAILED;
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try {
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byte[] bytes = readTile(tile.tileX, tile.tileY, tile.zoomLevel);
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if (mTransparentColor != null || mAlpha != null) {
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android.graphics.Bitmap androidBitmap = BitmapFactory.decodeByteArray(bytes, 0, bytes.length);
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if (mTransparentColor != null)
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androidBitmap = processTransparentColor(androidBitmap, mTransparentColor);
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if (mAlpha != null)
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androidBitmap = processAlpha(androidBitmap, mAlpha);
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ByteArrayOutputStream bos = new ByteArrayOutputStream();
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androidBitmap.compress(android.graphics.Bitmap.CompressFormat.PNG, 100, bos);
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bytes = bos.toByteArray();
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}
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Bitmap bitmap = CanvasAdapter.decodeBitmap(new ByteArrayInputStream(bytes));
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sink.setTileImage(bitmap);
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res = QueryResult.SUCCESS;
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} catch (Exception e) {
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log.debug("{} invalid bitmap", tile);
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} finally {
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sink.completed(res);
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}
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}
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/**
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* Read a Tile's image bytes from the MBTiles database.
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*
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* @param tileX the x tile index.
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* @param tileY the y tile index (OSM notation).
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* @param zoomLevel the zoom level.
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* @return the tile image bytes.
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*/
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private byte[] readTile(int tileX, int tileY, byte zoomLevel) {
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Cursor cursor = null;
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try {
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long tmsTileY = MercatorProjection.tileYToTMS(tileY, zoomLevel);
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cursor = mDatabase.rawQuery(SELECT_TILES, new String[]{String.valueOf(zoomLevel), String.valueOf(tileX), String.valueOf(tmsTileY)});
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if (cursor.moveToFirst())
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return cursor.getBlob(0);
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} finally {
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if (cursor != null)
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cursor.close();
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}
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return null;
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}
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}
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@@ -0,0 +1,99 @@
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/*
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* Copyright 2019 Andrea Antonello
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* Copyright 2019 devemux86
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*
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* This program is free software: you can redistribute it and/or modify it under the
|
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* terms of the GNU Lesser General Public License as published by the Free Software
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* Foundation, either version 3 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, but WITHOUT ANY
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* WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A
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* PARTICULAR PURPOSE. See the GNU Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public License along with
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* this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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package org.oscim.android.tiling.source.mbtiles;
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import org.oscim.core.BoundingBox;
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import org.oscim.tiling.ITileDataSource;
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import org.oscim.tiling.TileSource;
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/**
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* A tile source for MBTiles raster databases.
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*/
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public class MBTilesBitmapTileSource extends TileSource {
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private final MBTilesBitmapTileDataSource mTileDataSource;
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/**
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* Create a MBTiles tile source.
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*
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* @param path the path to the MBTiles database.
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*/
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public MBTilesBitmapTileSource(String path) {
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this(path, null, null);
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}
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/**
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* Create a MBTiles tile source.
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*
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* @param path the path to the MBTiles database.
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* @param alpha an optional alpha value [0-255] to make the tiles transparent.
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* @param transparentColor an optional color that will be made transparent in the bitmap.
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*/
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public MBTilesBitmapTileSource(String path, Integer alpha, Integer transparentColor) {
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mTileDataSource = new MBTilesBitmapTileDataSource(path, alpha, transparentColor);
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}
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@Override
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public void close() {
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mTileDataSource.dispose();
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}
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public String getAttribution() {
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return mTileDataSource.getAttribution();
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}
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public BoundingBox getBounds() {
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return mTileDataSource.getBounds();
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}
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@Override
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public ITileDataSource getDataSource() {
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return mTileDataSource;
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}
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public String getDescription() {
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return mTileDataSource.getDescription();
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}
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/**
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* @return the image format (jpg, png)
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*/
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public String getFormat() {
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return mTileDataSource.getFormat();
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}
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public int getMaxZoom() {
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return mTileDataSource.getMaxZoom();
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}
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public int getMinZoom() {
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return mTileDataSource.getMinZoom();
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}
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public String getName() {
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return mTileDataSource.getName();
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}
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public String getVersion() {
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return mTileDataSource.getVersion();
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}
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@Override
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public OpenResult open() {
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return OpenResult.SUCCESS;
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}
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}
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