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OpenGL vector map library - running on Android, iOS, Desktop and browser.
/*
* Copyright 2013 Hannes Janetzek
*
* This file is part of the OpenScienceMap project (http://www.opensciencemap.org).
*
* 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 keys = new ArrayList();
ArrayList values = new ArrayList();
String name = null;
int numFeatures = 0;
ArrayList features = new ArrayList();
int end = position() + bytes;
while (position() < end) {
// read tag and wire type
int val = decodeVarint32();
if (val == 0)
break;
int tag = (val >> 3);
switch (tag) {
case TAG_LAYER_KEYS:
keys.add(decodeString());
break;
case TAG_LAYER_VALUES:
values.add(decodeValue());
break;
case TAG_LAYER_FEATURES:
numFeatures++;
decodeFeature(features);
break;
case TAG_LAYER_VERSION:
//version =
decodeVarint32();
break;
case TAG_LAYER_NAME:
name = decodeString();
break;
case TAG_LAYER_EXTENT:
//extent =
decodeVarint32();
break;
default:
error(mTile + " invalid type for layer: " + tag);
break;
}
}
Tag layerTag = new Tag(name, Tag.VALUE_YES);
if (numFeatures == 0)
return true;
int[] ignoreLocal = new int[20];
int numIgnore = 0;
int fallBackLocal = -1;
int matchedLocal = -1;
for (int i = 0; i < keys.size(); i++) {
String key = keys.get(i);
if (!key.startsWith(Tag.KEY_NAME))
continue;
int len = key.length();
if (len == 4) {
fallBackLocal = i;
continue;
}
if (len < 7) {
ignoreLocal[numIgnore++] = i;
continue;
}
if (mLocale.equals(key.substring(5))) {
//log.debug("found local " + key);
matchedLocal = i;
} else
ignoreLocal[numIgnore++] = i;
}
for (Feature f : features) {
if (f.elem.type == GeometryType.NONE)
continue;
f.elem.tags.clear();
f.elem.tags.add(layerTag);
boolean hasName = false;
String fallbackName = null;
tagLoop:
for (int j = 0; j < (f.numTags << 1); j += 2) {
int keyIdx = f.tags[j];
for (int i = 0; i < numIgnore; i++)
if (keyIdx == ignoreLocal[i])
continue tagLoop;
if (keyIdx == fallBackLocal) {
fallbackName = values.get(f.tags[j + 1]);
continue;
}
String key;
String val = values.get(f.tags[j + 1]);
if (keyIdx == matchedLocal) {
hasName = true;
f.elem.tags.add(new Tag(Tag.KEY_NAME, val, false));
} else {
key = keys.get(keyIdx);
f.elem.tags.add(new Tag(key, val));
}
}
if (!hasName && fallbackName != null)
f.elem.tags.add(new Tag(Tag.KEY_NAME, fallbackName, false));
// FIXME extract layer tag here
f.elem.setLayer(5);
mMapDataCallback.process(f.elem);
f = mFeaturePool.release(f);
}
return true;
}
private final Pool mFeaturePool = new Pool() {
int count;
@Override
protected Feature createItem() {
count++;
return new Feature();
}
@Override
protected boolean clearItem(Feature item) {
if (count > 100) {
count--;
return false;
}
item.elem.tags.clear();
item.elem.clear();
item.tags = null;
item.type = 0;
item.numTags = 0;
return true;
}
};
static class Feature extends Inlist {
short[] tags;
int numTags;
int type;
final MapElement elem;
Feature() {
elem = new MapElement();
}
boolean match(short otherTags[], int otherNumTags, int otherType) {
if (numTags != otherNumTags)
return false;
if (type != otherType)
return false;
for (int i = 0; i < numTags << 1; i++) {
if (tags[i] != otherTags[i])
return false;
}
return true;
}
}
private void decodeFeature(ArrayList features) throws IOException {
int bytes = decodeVarint32();
int end = position() + bytes;
int type = 0;
//long id;
lastX = 0;
lastY = 0;
mTmpTags[0] = -1;
Feature curFeature = null;
int numTags = 0;
//log.debug("start feature");
while (position() < end) {
// read tag and wire type
int val = decodeVarint32();
if (val == 0)
break;
int tag = (val >>> 3);
switch (tag) {
case TAG_FEATURE_ID:
//id =
decodeVarint32();
break;
case TAG_FEATURE_TAGS:
mTmpTags = decodeUnsignedVarintArray(mTmpTags);
for (; numTags < mTmpTags.length && mTmpTags[numTags] >= 0; )
numTags += 2;
numTags >>= 1;
break;
case TAG_FEATURE_TYPE:
type = decodeVarint32();
//log.debug("got type " + type);
break;
case TAG_FEATURE_GEOMETRY:
for (Feature f : features) {
if (f.match(mTmpTags, numTags, type)) {
curFeature = f;
break;
}
}
if (curFeature == null) {
curFeature = mFeaturePool.get();
curFeature.tags = new short[numTags << 1];
System.arraycopy(mTmpTags, 0, curFeature.tags, 0, numTags << 1);
curFeature.numTags = numTags;
curFeature.type = type;
features.add(curFeature);
}
decodeCoordinates(type, curFeature);
break;
default:
error(mTile + " invalid type for feature: " + tag);
break;
}
}
}
private final static int CLOSE_PATH = 0x07;
private final static int MOVE_TO = 0x01;
//private final static int LINE_TO = 0x02;
private int lastX, lastY;
private int decodeCoordinates(int type, Feature feature) throws IOException {
int bytes = decodeVarint32();
fillBuffer(bytes);
if (feature == null) {
bufferPos += bytes;
return 0;
}
MapElement elem = feature.elem;
boolean isPoint = false;
boolean isPoly = false;
boolean isLine = false;
if (type == TAG_GEOM_LINE) {
elem.startLine();
isLine = true;
} else if (type == TAG_GEOM_POLYGON) {
elem.startPolygon();
isPoly = true;
} else if (type == TAG_GEOM_POINT) {
isPoint = true;
elem.startPoints();
} else if (type == TAG_GEOM_UNKNOWN)
elem.startPoints();
boolean even = true;
int val;
int curX = 0;
int curY = 0;
int prevX = 0;
int prevY = 0;
int cmd = 0;
int num = 0, cnt = 0;
boolean first = true;
boolean lastClip = false;
// test bbox for outer..
boolean isOuter = true;
boolean simplify = mTile.zoomLevel < 14;
int pixel = simplify ? 7 : 3;
int xmin = Integer.MAX_VALUE, xmax = Integer.MIN_VALUE;
int ymin = Integer.MAX_VALUE, ymax = Integer.MIN_VALUE;
for (int end = bufferPos + bytes; bufferPos < end; ) {
val = decodeVarint32Filled();
if (num == 0) {
// number of points
num = val >>> 3;
cnt = 0;
// path command
cmd = val & 0x07;
if (isLine && lastClip) {
elem.addPoint(curX / mScale, curY / mScale);
lastClip = false;
}
if (cmd == CLOSE_PATH) {
num = 0;
continue;
}
if (first) {
first = false;
continue;
}
if (cmd == MOVE_TO) {
if (type == TAG_GEOM_LINE)
elem.startLine();
else if (type == TAG_GEOM_POLYGON) {
isOuter = false;
elem.startHole();
}
}
continue;
}
// zigzag decoding
int s = ((val >>> 1) ^ -(val & 1));
if (even) {
// get x coordinate
even = false;
curX = lastX = lastX + s;
continue;
}
// get y coordinate and add point to geometry
num--;
even = true;
curY = lastY = lastY + s;
int dx = (curX - prevX);
int dy = (curY - prevY);
if (isPoly && num == 0 && cnt > 0) {
prevX = curX;
prevY = curY;
// only add last point if it is di
int ppos = cnt * 2;
if (elem.points[elem.pointPos - ppos] != curX
|| elem.points[elem.pointPos - ppos + 1] != curY)
elem.addPoint(curX / mScale, curY / mScale);
lastClip = false;
continue;
}
if ((isPoint || cmd == MOVE_TO)
|| (dx > pixel || dx < -pixel)
|| (dy > pixel || dy < -pixel)
// hack to not clip at tile boundaries
|| (curX <= 0 || curX >= 4095)
|| (curY <= 0 || curY >= 4095)) {
prevX = curX;
prevY = curY;
elem.addPoint(curX / mScale, curY / mScale);
cnt++;
if (simplify && isOuter) {
if (curX < xmin)
xmin = curX;
if (curX > xmax)
xmax = curX;
if (curY < ymin)
ymin = curY;
if (curY > ymax)
ymax = curY;
}
lastClip = false;
continue;
}
lastClip = true;
}
if (isPoly && isOuter && simplify && !testBBox(xmax - xmin, ymax - ymin)) {
//log.debug("skip small poly "+ elem.indexPos + " > "
// + (xmax - xmin) * (ymax - ymin));
elem.pointPos -= elem.index[elem.indexPos];
if (elem.indexPos > 0) {
elem.indexPos -= 2;
elem.index[elem.indexPos + 1] = -1;
} else {
elem.type = GeometryType.NONE;
}
return 0;
}
if (isLine && lastClip)
elem.addPoint(curX / mScale, curY / mScale);
return 1;
}
private static boolean testBBox(int dx, int dy) {
return dx * dy > 64 * 64;
}
private String decodeValue() throws IOException {
int bytes = decodeVarint32();
String value = null;
int end = position() + bytes;
while (position() < end) {
// read tag and wire type
int val = decodeVarint32();
if (val == 0)
break;
int tag = (val >> 3);
switch (tag) {
case TAG_VALUE_STRING:
value = decodeString();
break;
case TAG_VALUE_UINT:
value = String.valueOf(decodeVarint32());
break;
case TAG_VALUE_SINT:
value = String.valueOf(deZigZag(decodeVarint32()));
break;
case TAG_VALUE_LONG:
value = String.valueOf(decodeVarint64());
break;
case TAG_VALUE_FLOAT:
value = String.valueOf(decodeFloat());
break;
case TAG_VALUE_DOUBLE:
value = String.valueOf(decodeDouble());
break;
case TAG_VALUE_BOOL:
value = decodeBool() ? "yes" : "no";
break;
default:
break;
}
}
return value;
}
}