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OpenGL vector map library written in Java - running on Android, iOS, Desktop and within the browser.
There is a newer version: 0.9.2
/*
 * Copyright 2017 Longri
 * Copyright 2017-2018 devemux86
 *
 * This program is free software: you can redistribute it and/or modify it under the
 * terms of the GNU Lesser General Public License as published by the Free Software
 * Foundation, either version 3 of the License, or (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful, but WITHOUT ANY
 * WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A
 * PARTICULAR PURPOSE. See the GNU Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public License along with
 * this program. If not, see .
 */
package org.oscim.theme;

import org.oscim.backend.CanvasAdapter;
import org.oscim.backend.Platform;
import org.oscim.backend.XMLReaderAdapter;
import org.oscim.backend.canvas.Bitmap;
import org.oscim.renderer.atlas.TextureAtlas;
import org.oscim.renderer.atlas.TextureRegion;
import org.oscim.theme.IRenderTheme.ThemeException;
import org.oscim.theme.rule.Rule;
import org.oscim.theme.styles.RenderStyle;
import org.oscim.theme.styles.SymbolStyle;
import org.oscim.theme.styles.SymbolStyle.SymbolBuilder;
import org.oscim.utils.TextureAtlasUtils;

import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;

public class XmlAtlasThemeBuilder extends XmlThemeBuilder {

    /**
     * @param theme an input theme containing valid render theme XML data.
     * @return a new RenderTheme which is created by parsing the XML data from the input theme.
     * @throws ThemeException if an error occurs while parsing the render theme XML.
     */
    public static IRenderTheme read(ThemeFile theme) throws ThemeException {
        return read(theme, null);
    }

    /**
     * @param theme         an input theme containing valid render theme XML data.
     * @param themeCallback the theme callback.
     * @return a new RenderTheme which is created by parsing the XML data from the input theme.
     * @throws ThemeException if an error occurs while parsing the render theme XML.
     */
    public static IRenderTheme read(ThemeFile theme, ThemeCallback themeCallback) throws ThemeException {
        Map outputMap = new HashMap<>();
        List atlasList = new ArrayList<>();
        XmlAtlasThemeBuilder renderThemeHandler = new XmlAtlasThemeBuilder(theme, themeCallback, outputMap, atlasList);

        try {
            new XMLReaderAdapter().parse(renderThemeHandler, theme.getRenderThemeAsStream());
        } catch (Exception e) {
            throw new ThemeException(e.getMessage());
        }

        TextureAtlasUtils.createTextureRegions(renderThemeHandler.bitmapMap, outputMap, atlasList,
                true, CanvasAdapter.platform == Platform.IOS);

        return replaceThemeSymbols(renderThemeHandler.mRenderTheme, outputMap);
    }

    private static IRenderTheme replaceThemeSymbols(RenderTheme renderTheme, Map regionMap) {
        SymbolBuilder symbolBuilder = SymbolStyle.builder();
        for (Rule rule : renderTheme.getRules()) {
            replaceRuleSymbols(rule, regionMap, symbolBuilder);
        }
        return renderTheme;
    }

    private static void replaceRuleSymbols(Rule rule, Map regionMap, SymbolBuilder b) {
        for (int i = 0, n = rule.styles.length; i < n; i++) {
            RenderStyle style = rule.styles[i];
            if (style instanceof SymbolStyle) {
                SymbolStyle symbol = (SymbolStyle) style;
                TextureRegion region = regionMap.get(symbol.hash);
                if (region != null)
                    rule.styles[i] = b.set(symbol)
                            .bitmap(null)
                            .texture(region)
                            .build();
            }
        }
        for (Rule subRule : rule.subRules) {
            replaceRuleSymbols(subRule, regionMap, b);
        }
    }

    private final Map regionMap;
    private final List atlasList;

    private final Map bitmapMap = new HashMap<>();

    public XmlAtlasThemeBuilder(ThemeFile theme,
                                Map regionMap, List atlasList) {
        this(theme, null, regionMap, atlasList);
    }

    public XmlAtlasThemeBuilder(ThemeFile theme, ThemeCallback themeCallback,
                                Map regionMap, List atlasList) {
        super(theme, themeCallback);
        this.regionMap = regionMap;
        this.atlasList = atlasList;
    }

    @Override
    RenderTheme createTheme(Rule[] rules) {
        return new AtlasRenderTheme(mMapBackground, mTextScale, rules, mLevels, mMapsforgeTheme, regionMap, atlasList);
    }

    @Override
    SymbolStyle buildSymbol(SymbolBuilder b, String src, Bitmap bitmap) {
        // we need to hash with the width/height included as the same symbol could be required
        // in a different size and must be cached with a size-specific hash
        String absoluteName = CanvasAdapter.getAbsoluteFile(mTheme.getRelativePathPrefix(), src).getAbsolutePath();
        int hash = new StringBuilder().append(absoluteName).append(b.symbolWidth).append(b.symbolHeight).append(b.symbolPercent).toString().hashCode();
        bitmapMap.put(hash, bitmap);
        return b.hash(hash).build();
    }
}