diff --git a/cubiomes b/cubiomes
index 0933804..270ed51 160000
--- a/cubiomes
+++ b/cubiomes
@@ -1 +1 @@
-Subproject commit 0933804f15f4de107f0a1703f508521625292f87
+Subproject commit 270ed5162bd6ed31287688955311ce8e7928737a
diff --git a/cubiomes-viewer.pro b/cubiomes-viewer.pro
index 00f5592..ea03cc2 100644
--- a/cubiomes-viewer.pro
+++ b/cubiomes-viewer.pro
@@ -36,6 +36,7 @@ CONFIG += static
 
 SOURCES += \
         src/aboutdialog.cpp \
+        src/biomecolordialog.cpp \
         src/collapsible.cpp \
         src/conditiondialog.cpp \
         src/configdialog.cpp \
@@ -62,6 +63,7 @@ HEADERS += \
         $$CUPATH/layers.h \
         $$CUPATH/util.h \
         src/aboutdialog.h \
+        src/biomecolordialog.h \
         src/collapsible.h \
         src/conditiondialog.h \
         src/configdialog.h \
@@ -86,6 +88,7 @@ HEADERS += \
 
 FORMS += \
         src/aboutdialog.ui \
+        src/biomecolordialog.ui \
         src/conditiondialog.ui \
         src/configdialog.ui \
         src/extgendialog.ui \
diff --git a/src/aboutdialog.h b/src/aboutdialog.h
index e1e0956..aad4b8e 100644
--- a/src/aboutdialog.h
+++ b/src/aboutdialog.h
@@ -6,7 +6,7 @@
 
 #define VERS_MAJOR 2
 #define VERS_MINOR 2
-#define VERS_PATCH -1   // negative patch number designates a development version
+#define VERS_PATCH -2   // negative patch number designates a development version
 
 // returns +1 if newer, -1 if older  and 0 if equal
 inline int cmpVers(int major, int minor, int patch)
diff --git a/src/biomecolordialog.cpp b/src/biomecolordialog.cpp
new file mode 100644
index 0000000..45a1521
--- /dev/null
+++ b/src/biomecolordialog.cpp
@@ -0,0 +1,303 @@
+#include "biomecolordialog.h"
+#include "ui_biomecolordialog.h"
+#include "mainwindow.h"
+#include "cutil.h"
+
+#include <QPixmap>
+#include <QPainter>
+#include <QPainterPath>
+#include <QPen>
+#include <QIcon>
+#include <QPushButton>
+#include <QColorDialog>
+#include <QInputDialog>
+#include <QStandardPaths>
+#include <QFile>
+#include <QTextStream>
+#include <QDirIterator>
+
+
+#define DIM_DIVIDER 6
+
+static QIcon getColorIcon(const QColor& col)
+{
+    QPixmap pixmap(14,14);
+    pixmap.fill(QColor(0,0,0,0));
+    QPainter p(&pixmap);
+    p.setRenderHint(QPainter::Antialiasing);
+    QPainterPath path;
+    path.addRoundedRect(QRectF(1, 1, 12, 12), 3, 3);
+    QPen pen(Qt::black, 1);
+    p.setPen(pen);
+
+    p.fillPath(path, col);
+    p.drawPath(path);
+    return QIcon(pixmap);
+}
+
+BiomeColorDialog::BiomeColorDialog(MainWindow *parent, QString initrc)
+    : QDialog(parent)
+    , ui(new Ui::BiomeColorDialog)
+    , parent(parent)
+    , modified()
+{
+    ui->setupUi(this);
+    ui->buttonOk->setIcon(style()->standardIcon(QStyle::SP_DialogOkButton));
+
+    memset(buttons, 0, sizeof(buttons));
+    memcpy(colors, biomeColors, sizeof(colors));
+
+    unsigned char coldefault[256][3];
+    initBiomeColors(coldefault);
+
+
+    QPushButton *button;
+
+    button = new QPushButton(QIcon(), tr("All to default"), this);
+    connect(button, &QPushButton::clicked, this, &BiomeColorDialog::onAllToDefault);
+    ui->gridLayout->addWidget(button, 0, 1);
+
+    button = new QPushButton(QIcon(), tr("All to dimmed"), this);
+    connect(button, &QPushButton::clicked, this, &BiomeColorDialog::onAllToDimmed);
+    ui->gridLayout->addWidget(button, 0, 2);
+
+    for (int i = 0; i < 256; i++)
+    {
+        const char *bname = biome2str(MC_NEWEST, i);
+        if (!bname)
+            continue;
+
+        QColor col;
+        col = QColor(colors[i][0], colors[i][1], colors[i][2]);
+        buttons[i] = button = new QPushButton(getColorIcon(col), bname, this);
+        connect(button, &QPushButton::clicked, [=]() { this->editBiomeColor(i); });
+        ui->gridLayout->addWidget(button, i+1, 0);
+
+        col = QColor(coldefault[i][0], coldefault[i][1], coldefault[i][2]);
+        button = new QPushButton(getColorIcon(col), tr("Default reset"), this);
+        connect(button, &QPushButton::clicked, [=]() { this->setBiomeColor(i, col); });
+        ui->gridLayout->addWidget(button, i+1, 1);
+
+        col = QColor(coldefault[i][0] / DIM_DIVIDER, coldefault[i][1] / DIM_DIVIDER, coldefault[i][2] / DIM_DIVIDER);
+        button = new QPushButton(getColorIcon(col), tr("Dimmed reset"), this);
+        connect(button, &QPushButton::clicked, [=]() { this->setBiomeColor(i, col); });
+        ui->gridLayout->addWidget(button, i+1, 2);
+    }
+
+    QString dir = QStandardPaths::writableLocation(QStandardPaths::AppConfigLocation);
+    QDirIterator it(dir, QDirIterator::NoIteratorFlags);
+    while (it.hasNext())
+    {
+        QString rc = it.next();
+        if (!rc.endsWith(".colormap"))
+            continue;
+        QFile file(rc);
+        if (!file.open(QIODevice::ReadOnly))
+            continue;
+        QTextStream stream(&file);
+        QString line = stream.readLine();
+        if (line.length() < 2 || !line.startsWith(";"))
+            continue;
+        ui->comboColormaps->addItem(line.mid(1).trimmed(), rc);
+    }
+    ui->comboColormaps->model()->sort(0, Qt::AscendingOrder);
+    ui->comboColormaps->insertItem(0, tr("[default]"));
+    int index = 0;
+    for (int i = 0; i < ui->comboColormaps->count(); i++)
+    {
+        QString itemrc = qvariant_cast<QString>(ui->comboColormaps->itemData(i));
+        if (initrc == itemrc)
+        {
+            index = i;
+            break;
+        }
+    }
+    ui->comboColormaps->setCurrentIndex(index);
+}
+
+BiomeColorDialog::~BiomeColorDialog()
+{
+    delete ui;
+}
+
+/// Saves the current colormap as the given rc.
+/// If the rc already corresponds to an item, the description
+/// will be updated only if the new desc is non-empty.
+int BiomeColorDialog::saveColormap(QString rc, QString desc)
+{
+    if (rc.isEmpty())
+        return -1;
+    QFile file(rc);
+    if (!file.open(QIODevice::WriteOnly))
+        return -1;
+
+    int index = -1;
+    for (int i = 0; i < ui->comboColormaps->count(); i++)
+    {
+        QString itemrc = qvariant_cast<QString>(ui->comboColormaps->itemData(i));
+        if (rc == itemrc)
+        {
+            index = i;
+            if (desc.isEmpty())
+                desc = ui->comboColormaps->itemText(i);
+            break;
+        }
+    }
+
+    QTextStream stream(&file);
+    stream << ";" << desc << "\n";
+    for (int i = 0; i < 256; i++)
+    {
+        const char *bname = biome2str(MC_NEWEST, i);
+        if (!bname)
+            continue;
+        stream << bname << " " << colors[i][0] << " " << colors[i][1] << " " << colors[i][2] << "\n";
+    }
+
+    modified = false;
+    if (index > 0)
+    {
+        ui->comboColormaps->setItemText(index, desc);
+    }
+    else
+    {
+        index = ui->comboColormaps->count();
+        ui->comboColormaps->addItem(desc, rc);
+    }
+    return index;
+}
+
+void BiomeColorDialog::setBiomeColor(int id, const QColor &col)
+{
+    buttons[id]->setIcon(getColorIcon(col));
+    colors[id][0] = col.red();
+    colors[id][1] = col.green();
+    colors[id][2] = col.blue();
+    modified = true;
+}
+
+void BiomeColorDialog::editBiomeColor(int id)
+{
+    QColor col = QColor(colors[id][0], colors[id][1], colors[id][2]);
+    QColorDialog *dialog = new QColorDialog(col, this);
+    //dialog->setOption(QColorDialog::DontUseNativeDialog, true);
+    if (dialog->exec())
+    {
+        setBiomeColor(id, dialog->selectedColor());
+    }
+}
+
+void BiomeColorDialog::on_comboColormaps_currentIndexChanged(int index)
+{
+    ui->buttonRemove->setEnabled(index != 0);
+    if (modified)
+    {
+        if (activerc.isEmpty())
+            on_buttonSaveAs_clicked();
+        else
+            saveColormap(activerc, "");
+    }
+
+    activerc = qvariant_cast<QString>(ui->comboColormaps->currentData());
+    QFile file(activerc);
+    if (!activerc.isEmpty() && file.open(QIODevice::ReadOnly))
+    {
+        char buf[32*1024];
+        qint64 siz = file.read(buf, sizeof(buf)-1);
+        file.close();
+        if (siz >= 0)
+        {
+            buf[siz] = 0;
+            initBiomeColors(colors);
+            parseBiomeColors(colors, buf);
+        }
+    }
+    else
+    {
+        initBiomeColors(colors);
+    }
+
+    for (int i = 0; i < 256; i++)
+    {
+        if (buttons[i])
+        {
+            QColor col(colors[i][0], colors[i][1], colors[i][2]);
+            buttons[i]->setIcon(getColorIcon(col));
+        }
+    }
+}
+
+void BiomeColorDialog::on_buttonSaveAs_clicked()
+{
+    QString rc;
+    int n;
+    QString path = QStandardPaths::writableLocation(QStandardPaths::AppConfigLocation);
+    for (n = 1; n < 1000; n++)
+    {
+        rc = path + "/" + QString::number(n) + ".colormap";
+        if (!QFile::exists(rc))
+            break;
+    }
+    bool ok;
+    QString desc = QInputDialog::getText(
+            this, tr("Save biome colors as..."),
+            tr("Biome colors:"), QLineEdit::Normal,
+            QString("Colormap#%1").arg(n), &ok);
+    if (!ok || desc.isEmpty())
+        return;
+
+    int idx = saveColormap(rc, desc);
+    ui->comboColormaps->setCurrentIndex(idx);
+    activerc = rc;
+}
+
+void BiomeColorDialog::on_buttonRemove_clicked()
+{
+    QString rc = qvariant_cast<QString>(ui->comboColormaps->currentData());
+    if (!rc.isEmpty())
+    {
+        modified = false; // discard changes
+        ui->comboColormaps->removeItem(ui->comboColormaps->currentIndex());
+        QFile file(rc);
+        file.remove();
+    }
+}
+
+void BiomeColorDialog::on_buttonOk_clicked()
+{
+    on_comboColormaps_currentIndexChanged(ui->comboColormaps->currentIndex());
+    parent->setBiomeColorRc(activerc);
+    accept();
+}
+
+
+void BiomeColorDialog::onAllToDefault()
+{
+    initBiomeColors(colors);
+    for (int i = 0; i < 256; i++)
+    {
+        if (buttons[i])
+        {
+            QColor col(colors[i][0], colors[i][1], colors[i][2]);
+            buttons[i]->setIcon(getColorIcon(col));
+        }
+    }
+    modified = true;
+}
+
+void BiomeColorDialog::onAllToDimmed()
+{
+    initBiomeColors(colors);
+    for (int i = 0; i < 256; i++)
+    {
+        colors[i][0] /= DIM_DIVIDER;
+        colors[i][1] /= DIM_DIVIDER;
+        colors[i][2] /= DIM_DIVIDER;
+        if (buttons[i])
+        {
+            QColor col(colors[i][0], colors[i][1], colors[i][2]);
+            buttons[i]->setIcon(getColorIcon(col));
+        }
+    }
+    modified = true;
+}
diff --git a/src/biomecolordialog.h b/src/biomecolordialog.h
new file mode 100644
index 0000000..cb7e0af
--- /dev/null
+++ b/src/biomecolordialog.h
@@ -0,0 +1,44 @@
+#ifndef BIOMECOLORDIALOG_H
+#define BIOMECOLORDIALOG_H
+
+#include <QDialog>
+
+namespace Ui {
+class BiomeColorDialog;
+}
+
+class MainWindow;
+
+class BiomeColorDialog : public QDialog
+{
+    Q_OBJECT
+
+public:
+    explicit BiomeColorDialog(MainWindow *parent, QString initrc);
+    ~BiomeColorDialog();
+
+    int saveColormap(QString rc, QString desc);
+
+public slots:
+    void setBiomeColor(int id, const QColor &col);
+    void editBiomeColor(int id);
+
+private slots:
+    void on_comboColormaps_currentIndexChanged(int index);
+    void on_buttonSaveAs_clicked();
+    void on_buttonRemove_clicked();
+    void on_buttonOk_clicked();
+
+    void onAllToDefault();
+    void onAllToDimmed();
+
+private:
+    Ui::BiomeColorDialog *ui;
+    MainWindow *parent;
+    QPushButton *buttons[256];
+    unsigned char colors[256][3];
+    QString activerc;
+    bool modified;
+};
+
+#endif // BIOMECOLORDIALOG_H
diff --git a/src/biomecolordialog.ui b/src/biomecolordialog.ui
new file mode 100644
index 0000000..8cedb7d
--- /dev/null
+++ b/src/biomecolordialog.ui
@@ -0,0 +1,87 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<ui version="4.0">
+ <class>BiomeColorDialog</class>
+ <widget class="QDialog" name="BiomeColorDialog">
+  <property name="geometry">
+   <rect>
+    <x>0</x>
+    <y>0</y>
+    <width>580</width>
+    <height>600</height>
+   </rect>
+  </property>
+  <property name="windowTitle">
+   <string>Biome Color Editor</string>
+  </property>
+  <property name="windowIcon">
+   <iconset resource="../rc/icons.qrc">
+    <normaloff>:/icons/map.png</normaloff>:/icons/map.png</iconset>
+  </property>
+  <layout class="QGridLayout" name="gridLayout_2">
+   <item row="0" column="1" colspan="2">
+    <widget class="QComboBox" name="comboColormaps"/>
+   </item>
+   <item row="0" column="0">
+    <widget class="QLabel" name="label">
+     <property name="text">
+      <string>Biome color map:</string>
+     </property>
+    </widget>
+   </item>
+   <item row="2" column="0" colspan="3">
+    <layout class="QHBoxLayout" name="horizontalLayout">
+     <item>
+      <widget class="QPushButton" name="buttonSaveAs">
+       <property name="text">
+        <string>Save as...</string>
+       </property>
+      </widget>
+     </item>
+     <item>
+      <widget class="QPushButton" name="buttonRemove">
+       <property name="text">
+        <string>Remove</string>
+       </property>
+      </widget>
+     </item>
+     <item>
+      <widget class="QPushButton" name="buttonOk">
+       <property name="text">
+        <string>Ok</string>
+       </property>
+      </widget>
+     </item>
+    </layout>
+   </item>
+   <item row="1" column="0" colspan="3">
+    <widget class="QScrollArea" name="scrollArea">
+     <property name="widgetResizable">
+      <bool>true</bool>
+     </property>
+     <widget class="QWidget" name="scrollAreaWidgetContents">
+      <property name="geometry">
+       <rect>
+        <x>0</x>
+        <y>0</y>
+        <width>562</width>
+        <height>521</height>
+       </rect>
+      </property>
+      <property name="styleSheet">
+       <string notr="true">text-align:left;</string>
+      </property>
+      <layout class="QGridLayout" name="gridLayout_3">
+       <item row="0" column="0">
+        <layout class="QGridLayout" name="gridLayout"/>
+       </item>
+      </layout>
+     </widget>
+    </widget>
+   </item>
+  </layout>
+ </widget>
+ <resources>
+  <include location="../rc/icons.qrc"/>
+ </resources>
+ <connections/>
+</ui>
diff --git a/src/cutil.h b/src/cutil.h
index 899d40e..189293f 100644
--- a/src/cutil.h
+++ b/src/cutil.h
@@ -35,6 +35,7 @@ inline const char* struct2str(int stype)
     case Bastion:           return "bastion";
     case End_City:          return "end_city";
     case End_Gateway:       return "end_gateway";
+    case Ancient_City:      return "ancient_city";
     }
     return "?";
 }
diff --git a/src/mainwindow.cpp b/src/mainwindow.cpp
index 2224420..beffa4f 100644
--- a/src/mainwindow.cpp
+++ b/src/mainwindow.cpp
@@ -7,6 +7,7 @@
 #include "aboutdialog.h"
 #include "conditiondialog.h"
 #include "extgendialog.h"
+#include "biomecolordialog.h"
 
 #if WITH_UPDATER
 #include "updater.h"
@@ -344,6 +345,12 @@ int MainWindow::getDim()
     return 0;
 }
 
+void MainWindow::setBiomeColorRc(QString rc)
+{
+    config.biomeColorPath = rc;
+    onBiomeColorChange();
+}
+
 void MainWindow::saveSettings()
 {
     QSettings settings("cubiomes-viewer", "cubiomes-viewer");
@@ -837,7 +844,7 @@ void MainWindow::on_actionPreferences_triggered()
 void MainWindow::onBiomeColorChange()
 {
     QFile file(config.biomeColorPath);
-    if (file.open(QIODevice::ReadOnly))
+    if (!config.biomeColorPath.isEmpty() && file.open(QIODevice::ReadOnly))
     {
         char buf[32*1024];
         qint64 siz = file.read(buf, sizeof(buf)-1);
@@ -853,7 +860,7 @@ void MainWindow::onBiomeColorChange()
     {
         initBiomeColors(biomeColors);
     }
-    ui->mapView->refresh();
+    ui->mapView->refreshBiomeColors();
 }
 
 void MainWindow::on_actionGo_to_triggered()
@@ -878,6 +885,12 @@ void MainWindow::on_actionOpen_shadow_seed_triggered()
     }
 }
 
+void MainWindow::on_actionBiome_colors_triggered()
+{
+    BiomeColorDialog *dialog = new BiomeColorDialog(this, config.biomeColorPath);
+    dialog->show();
+}
+
 void MainWindow::on_actionPresetLoad_triggered()
 {
     WorldInfo wi;
diff --git a/src/mainwindow.h b/src/mainwindow.h
index 2034fb5..370f53b 100644
--- a/src/mainwindow.h
+++ b/src/mainwindow.h
@@ -50,6 +50,7 @@ public:
     bool setSeed(WorldInfo wi, int dim = INT_MAX);
     int getDim();
     MapView *getMapView();
+    void setBiomeColorRc(QString rc);
 
 protected:
 
@@ -77,6 +78,7 @@ private slots:
     void on_actionGo_to_triggered();
     void on_actionScan_seed_for_Quad_Huts_triggered();
     void on_actionOpen_shadow_seed_triggered();
+    void on_actionBiome_colors_triggered();
     void on_actionPresetLoad_triggered();
     void on_actionExamples_triggered();
     void on_actionAbout_triggered();
diff --git a/src/mainwindow.ui b/src/mainwindow.ui
index f577ef8..418a165 100644
--- a/src/mainwindow.ui
+++ b/src/mainwindow.ui
@@ -773,6 +773,7 @@ QToolButton:checked {
      <string>Map</string>
     </property>
     <addaction name="actionGo_to"/>
+    <addaction name="actionBiome_colors"/>
     <addaction name="actionScan_seed_for_Quad_Huts"/>
     <addaction name="actionOpen_shadow_seed"/>
    </widget>
@@ -903,6 +904,11 @@ QToolButton:checked {
     <string>Load filter preset...</string>
    </property>
   </action>
+  <action name="actionBiome_colors">
+   <property name="text">
+    <string>Biome colors...</string>
+   </property>
+  </action>
  </widget>
  <layoutdefault spacing="6" margin="11"/>
  <customwidgets>
diff --git a/src/mapview.cpp b/src/mapview.cpp
index da6b28f..276de68 100644
--- a/src/mapview.cpp
+++ b/src/mapview.cpp
@@ -135,6 +135,12 @@ void MapView::setConfig(const Config& c)
     update(2);
 }
 
+void MapView::refreshBiomeColors()
+{
+    if (world)
+        world->refreshBiomeColors();
+}
+
 void MapView::settingsToWorld()
 {
     if (!world)
diff --git a/src/mapview.h b/src/mapview.h
index 9669e6c..f78e8b7 100644
--- a/src/mapview.h
+++ b/src/mapview.h
@@ -44,6 +44,7 @@ public:
     bool getShow(int stype) { return stype >= 0 && stype < STRUCT_NUM ? sshow[stype] : false; }
     void setShow(int stype, bool v);
     void setConfig(const Config& config);
+    void refreshBiomeColors();
 
     void timeout();
 
diff --git a/src/quad.cpp b/src/quad.cpp
index 11e112e..88e5040 100644
--- a/src/quad.cpp
+++ b/src/quad.cpp
@@ -14,7 +14,7 @@
 Quad::Quad(const Level* l, int i, int j)
     : wi(l->wi),dim(l->dim),g(&l->g),scale(l->scale)
     , ti(i),tj(j),blocks(l->blocks),pixs(l->pixs),sopt(l->sopt)
-    , rgb(),img(),spos()
+    , biomes(),rgb(),img(),spos()
     , done(),isdel(l->isdel)
     , prio(),stopped()
 {
@@ -23,6 +23,7 @@ Quad::Quad(const Level* l, int i, int j)
 
 Quad::~Quad()
 {
+    if (biomes) free(biomes);
     delete img;
     delete spos;
     delete [] rgb;
@@ -104,6 +105,7 @@ void getStructs(std::vector<VarPos> *out, const StructureConfig sconf,
     }
 }
 
+QMutex g_mutex(QMutex::NonRecursive);
 
 void Quad::run()
 {
@@ -115,10 +117,10 @@ void Quad::run()
         int y = (scale > 1) ? wi.y >> 2 : wi.y;
         int x = ti*pixs, z = tj*pixs, w = pixs+SEAM_BUF, h = pixs+SEAM_BUF;
         Range r = {scale, x, z, w, h, y, 1};
-        int *b = allocCache(g, r);
-        if (!b) return;
+        biomes = allocCache(g, r);
+        if (!biomes) return;
 
-        int err = genBiomes(g, b, r);
+        int err = genBiomes(g, biomes, r);
         if (err)
         {
             fprintf(
@@ -128,11 +130,15 @@ void Quad::run()
                 mc2str(g->mc), g->seed, g->dim,
                 x, z, w, h, scale);
             for (int i = 0; i < w*h; i++)
-                b[i] = -1;
+                biomes[i] = -1;
         }
+
+        // sync biomeColors
+        g_mutex.lock();
+        g_mutex.unlock();
+
         rgb = new uchar[w*h * 3];
-        biomesToImage(rgb, biomeColors, b, w, h, 1, 1);
-        free(b);
+        biomesToImage(rgb, biomeColors, biomes, w, h, 1, 1);
         img = new QImage(rgb, w, h, 3*w, QImage::Format_RGB888);
     }
     else
@@ -469,6 +475,23 @@ int QWorld::getBiome(Pos p)
     return id;
 }
 
+void QWorld::refreshBiomeColors()
+{
+    g_mutex.lock();
+    for (Level& l : lvb)
+    {
+        for (Quad *q : l.cells)
+        {
+            QImage *img = q->img;
+            if (!img)
+                continue;
+            biomesToImage(q->rgb, biomeColors, q->biomes, img->width(), img->height(), 1, 1);
+        }
+    }
+    g_mutex.unlock();
+}
+
+
 void QWorld::cleancache(std::vector<Quad*>& cache, unsigned int maxsize)
 {
     size_t n = cache.size();
@@ -910,7 +933,7 @@ void QWorld::draw(QPainter& painter, int vw, int vh, qreal focusx, qreal focusz,
     }
 
     int pixs = lvb[0].pixs + SEAM_BUF;
-    unsigned int cachesize = memlimit / pixs / pixs / 3;
+    unsigned int cachesize = memlimit / pixs / pixs / 7; // sizeof(RGB) + sizeof(biome_id)
 
     cleancache(cachedbiomes, cachesize);
     cleancache(cachedstruct, cachesize);
diff --git a/src/quad.h b/src/quad.h
index 06ea197..258c6bd 100644
--- a/src/quad.h
+++ b/src/quad.h
@@ -160,6 +160,7 @@ public:
     int pixs;
     int sopt;
 
+    int *biomes;
     uchar *rgb;
 
     // img and spos act as an atomic gate (with NULL or non-NULL indicating available results)
@@ -217,6 +218,8 @@ struct QWorld
 
     int getBiome(Pos p);
 
+    void refreshBiomeColors();
+
     WorldInfo wi;
     int dim;
     Generator g;