X-Git-Url: https://git-public.kairo.at/?p=mandelbrot.git;a=blobdiff_plain;f=content%2Fmandelbrot.js;fp=content%2Fmandelbrot.js;h=68cdffe30e20cb902589518683a53182fefd3903;hp=0000000000000000000000000000000000000000;hb=3fd66836e6c5fbd25dd8f90dd50914cabeb7a9a7;hpb=ad2faff87132f18ada1b47149ca76678c1289ad1

diff --git a/content/mandelbrot.js b/content/mandelbrot.js
new file mode 100644
index 0000000..68cdffe
--- /dev/null
+++ b/content/mandelbrot.js
@@ -0,0 +1,938 @@
+/* ***** BEGIN LICENSE BLOCK *****
+ * Version: MPL 1.1/GPL 2.0/LGPL 2.1
+ *
+ * The contents of this file are subject to the Mozilla Public License Version
+ * 1.1 (the "License"); you may not use this file except in compliance with
+ * the License. You may obtain a copy of the License at
+ * http://www.mozilla.org/MPL/
+ *
+ * Software distributed under the License is distributed on an "AS IS" basis,
+ * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
+ * for the specific language governing rights and limitations under the
+ * License.
+ *
+ * The Original Code is KaiRo.at Mandelbrot, XULRunner version.
+ *
+ * The Initial Developer of the Original Code is
+ * Robert Kaiser <kairo@kairo.at>.
+ * Portions created by the Initial Developer are Copyright (C) 2008-2011
+ * the Initial Developer. All Rights Reserved.
+ *
+ * Contributor(s):
+ *   Robert Kaiser <kairo@kairo.at>
+ *   prefiks (patch for some speedups)
+ *   Boris Zbarsky <bzbarsky@mit.edu> (use imageData for canvas interaction)
+ *
+ * Alternatively, the contents of this file may be used under the terms of
+ * either the GNU General Public License Version 2 or later (the "GPL"), or
+ * the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
+ * in which case the provisions of the GPL or the LGPL are applicable instead
+ * of those above. If you wish to allow use of your version of this file only
+ * under the terms of either the GPL or the LGPL, and not to allow others to
+ * use your version of this file under the terms of the MPL, indicate your
+ * decision by deleting the provisions above and replace them with the notice
+ * and other provisions required by the GPL or the LGPL. If you do not delete
+ * the provisions above, a recipient may use your version of this file under
+ * the terms of any one of the MPL, the GPL or the LGPL.
+ *
+ * ***** END LICENSE BLOCK ***** */
+
+var gColorPalette = [];
+var gPref = Components.classes["@mozilla.org/preferences-service;1"]
+                      .getService(Components.interfaces.nsIPrefService)
+                      .getBranch(null);
+var gStartTime = 0;
+var gMbrotBundle;
+var gCurrentImageData;
+
+function Startup() {
+  updateIterMenu();
+  updateAlgoMenu();
+  updatePaletteMenu();
+  gMbrotBundle = document.getElementById("mbrotBundle");
+  document.getElementById("statusLabel").value = gMbrotBundle.getString("statusEmpty");
+
+  let img = document.getElementById("mbrotImage");
+  img.addEventListener("mouseup", imgEvHandler, false);
+  img.addEventListener("mousedown", imgEvHandler, false);
+  img.addEventListener("mousemove", imgEvHandler, false);
+  img.addEventListener("touchstart", imgEvHandler, false);
+  img.addEventListener("touchend", imgEvHandler, false);
+  img.addEventListener("touchcancel", imgEvHandler, false);
+  img.addEventListener("touchleave", imgEvHandler, false);
+  img.addEventListener("touchmove", imgEvHandler, false);
+}
+
+function getAdjustPref(prefname) {
+  let value;
+  switch (prefname) {
+    case "image.width":
+    case "image.height":
+      value = 0;
+      try {
+        value = gPref.getIntPref("mandelbrot." + prefname);
+      }
+      catch (e) { }
+      if ((value < 10) || (value > 5000)) {
+        value = 300;
+        gPref.setIntPref("mandelbrot." + prefname, value);
+      }
+      return value;
+    case "last_image.Cr_*":
+      let Cr_min = -2.0;
+      let Cr_max = 1.0;
+      try {
+        Cr_min = parseFloat(gPref.getCharPref("mandelbrot.last_image.Cr_min"));
+        Cr_max = parseFloat(gPref.getCharPref("mandelbrot.last_image.Cr_max"));
+      }
+      catch (e) { }
+      if ((Cr_min < -3) || (Cr_min > 2) ||
+          (Cr_max < -3) || (Cr_max > 2) || (Cr_min >= Cr_max)) {
+        Cr_min = -2.0; Cr_max = 1.0;
+      }
+      gPref.setCharPref("mandelbrot.last_image.Cr_min", Cr_min);
+      gPref.setCharPref("mandelbrot.last_image.Cr_max", Cr_max);
+      return {Cr_min: Cr_min, Cr_max: Cr_max};
+    case "last_image.Ci_*":
+      let Ci_min = -1.5;
+      let Ci_max = 1.5;
+      try {
+        Ci_min = parseFloat(gPref.getCharPref("mandelbrot.last_image.Ci_min"));
+        Ci_max = parseFloat(gPref.getCharPref("mandelbrot.last_image.Ci_max"));
+      }
+      catch (e) { }
+      if ((Ci_min < -2.5) || (Ci_min > 2.5) ||
+          (Ci_max < -2.5) || (Ci_max > 2.5) || (Ci_min >= Ci_max)) {
+        Ci_min = -1.5; Ci_max = 1.5;
+      }
+      gPref.setCharPref("mandelbrot.last_image.Ci_min", Ci_min);
+      gPref.setCharPref("mandelbrot.last_image.Ci_max", Ci_max);
+      return {Ci_min: Ci_min, Ci_max: Ci_max};
+    case "iteration_max":
+      value = 500;
+      try {
+        value = gPref.getIntPref("mandelbrot." + prefname);
+      }
+      catch (e) {
+        setIter(value);
+      }
+      if (value < 10 || value > 10000) {
+        value = 500;
+        setIter(value);
+      }
+      return value;
+    case "use_algorithm":
+      value = "numeric";
+      try {
+        value = gPref.getCharPref("mandelbrot." + prefname);
+      }
+      catch (e) {
+        setAlgorithm(value);
+      }
+      return value;
+   case "color_palette":
+      value = "kairo";
+      try {
+        value = gPref.getCharPref("mandelbrot." + prefname);
+      }
+      catch(e) {
+        setPalette(value);
+      }
+      return value;
+   case "syncProportions":
+      value = true;
+      try {
+        value = gPref.getBoolPref("mandelbrot." + prefname);
+      }
+      catch(e) {
+        gPref.setBoolPref("mandelbrot." + prefname, value);
+      }
+      return value;
+    default:
+      return false;
+  }
+}
+
+function adjustCoordsAndDraw(aC_min, aC_max) {
+  let iWidth = getAdjustPref("image.width");
+  let iHeight = getAdjustPref("image.height");
+
+  // correct coordinates
+  if (aC_min.r < -2)
+    aC_min.r = -2;
+  if (aC_max.r > 2)
+    aC_max.r = 2;
+  if ((aC_min.r > 2) || (aC_max.r < -2) || (aC_min.r >= aC_max.r)) {
+    aC_min.r = -2.0; aC_max.r = 1.0;
+  }
+  if (aC_min.i < -2)
+    aC_min.i = -2;
+  if (aC_max.i > 2)
+    aC_max.i = 2;
+  if ((aC_min.i > 2) || (aC_max.i < -2) || (aC_min.i >= aC_max.i)) {
+    aC_min.i = -1.3; aC_max.i = 1.3;
+  }
+
+  let CWidth = aC_max.r - aC_min.r;
+  let CHeight = aC_max.i - aC_min.i;
+  let C_mid = new complex(aC_min.r + CWidth / 2, aC_min.i + CHeight / 2);
+
+  let CRatio = Math.max(CWidth / iWidth, CHeight / iHeight);
+
+  gPref.setCharPref("mandelbrot.last_image.Cr_min", C_mid.r - iWidth * CRatio / 2);
+  gPref.setCharPref("mandelbrot.last_image.Cr_max", C_mid.r + iWidth * CRatio / 2);
+  gPref.setCharPref("mandelbrot.last_image.Ci_min", C_mid.i - iHeight * CRatio / 2);
+  gPref.setCharPref("mandelbrot.last_image.Ci_max", C_mid.i + iHeight * CRatio / 2);
+
+  drawImage();
+}
+
+function drawImage() {
+  let canvas = document.getElementById("mbrotImage");
+  let context = canvas.getContext("2d");
+
+  document.getElementById("drawButton").hidden = true;
+
+  document.getElementById("statusLabel").value = gMbrotBundle.getString("statusDrawing");
+
+  let Cr_vals = getAdjustPref("last_image.Cr_*");
+  let Cr_min = Cr_vals.Cr_min;
+  let Cr_max = Cr_vals.Cr_max;
+
+  let Ci_vals = getAdjustPref("last_image.Ci_*");
+  let Ci_min = Ci_vals.Ci_min;
+  let Ci_max = Ci_vals.Ci_max;
+
+  let iterMax = getAdjustPref("iteration_max");
+  let algorithm = getAdjustPref("use_algorithm");
+
+  let iWidth = getAdjustPref("image.width");
+  let iHeight = getAdjustPref("image.height");
+
+  gCurrentImageData = {
+    C_min: new complex(Cr_min, Ci_min),
+    C_max: new complex(Cr_max, Ci_max),
+    iWidth: iWidth,
+    iHeight: iHeight,
+    iterMax: iterMax
+  };
+
+  canvas.width = iWidth;
+  canvas.height = iHeight;
+
+  context.fillStyle = "rgba(255, 255, 255, 127)";
+  context.fillRect(0, 0, canvas.width, canvas.height);
+
+  gStartTime = new Date();
+
+  drawLine(0, [Cr_min, Cr_max, Ci_min, Ci_max],
+              canvas, context, iterMax, algorithm);
+}
+
+function drawLine(line, dimensions, canvas, context, iterMax, algorithm) {
+  let Cr_min = dimensions[0];
+  let Cr_max = dimensions[1];
+  let Cr_scale = Cr_max - Cr_min;
+
+  let Ci_min = dimensions[2];
+  let Ci_max = dimensions[3];
+  let Ci_scale = Ci_max - Ci_min;
+
+  let lines = Math.min(canvas.height - line, 8);
+  let imageData = context.createImageData(canvas.width, lines);
+  let pixels = imageData.data;
+  let idx = 0;
+  for (var img_y = line; img_y < canvas.height && img_y < line+8; img_y++)
+    for (let img_x = 0; img_x < canvas.width; img_x++) {
+      let C = new complex(Cr_min + (img_x / canvas.width) * Cr_scale,
+                          Ci_min + (img_y / canvas.height) * Ci_scale);
+      let colors = drawPoint(context, img_x, img_y, C, iterMax, algorithm);
+      pixels[idx++] = colors[0];
+      pixels[idx++] = colors[1];
+      pixels[idx++] = colors[2];
+      pixels[idx++] = colors[3];
+    }
+  context.putImageData(imageData, 0, line);
+
+  if (img_y < canvas.height)
+    setTimeout(drawLine, 0, img_y, dimensions, canvas, context, iterMax, algorithm);
+  else if (gStartTime)
+    EndCalc();
+}
+
+function EndCalc() {
+  let endTime = new Date();
+  let timeUsed = (endTime.getTime() - gStartTime.getTime()) / 1000;
+  document.getElementById("statusLabel").value =
+      gMbrotBundle.getFormattedString("statusTime", [timeUsed.toFixed(3)]);
+  gStartTime = 0;
+}
+
+function complex(aReal, aImag) {
+  this.r = aReal;
+  this.i = aImag;
+}
+complex.prototype = {
+  square: function() {
+    return new complex(this.r * this.r - this.i * this.i,
+                       2 * this.r * this.i);
+  },
+  dist: function() {
+    return Math.sqrt(this.r * this.r + this.i * this.i);
+  },
+  add: function(aComplex) {
+    return new complex(this.r + aComplex.r, this.i + aComplex.i);
+  }
+}
+
+function mandelbrotValueOO (aC, aIterMax) {
+  // this would be nice code in general but it looks like JS objects are too heavy for normal use.
+  let Z = new complex(0.0, 0.0);
+  for (var iter = 0; iter < aIterMax; iter++) {
+    Z = Z.square().add(aC);
+    if (Z.r * Z.r + Z.i * Z.i > 256) { break; }
+  }
+  return iter;
+}
+
+function mandelbrotValueNumeric (aC, aIterMax) {
+  // optimized numeric code for fast calculation
+  let Cr = aC.r, Ci = aC.i;
+  let Zr = 0.0, Zi = 0.0;
+  let Zr2 = Zr * Zr, Zi2 = Zi * Zi;
+  for (var iter = 0; iter < aIterMax; iter++) {
+    Zi = 2 * Zr * Zi + Ci;
+    Zr = Zr2 - Zi2 + Cr;
+
+    Zr2 = Zr * Zr; Zi2 = Zi * Zi;
+    if (Zr2 + Zi2 > 256) { break; }
+  }
+  return iter;
+}
+
+function getColor(aIterValue, aIterMax) {
+  let standardizedValue = Math.round(aIterValue * 1024 / aIterMax);
+  if (gColorPalette && gColorPalette.length)
+    return gColorPalette[standardizedValue];
+
+  // fallback to simple b/w if for some reason we don't have a palette
+  if (aIterValue == aIterMax)
+    return [0, 0, 0, 255];
+  else
+    return [255, 255, 255, 255];
+}
+
+function getColorPalette(palName) {
+  var palette = [];
+  switch (palName) {
+    case 'bw':
+      for (let i = 0; i < 1024; i++) {
+        palette[i] = [255, 255, 255, 255];
+      }
+      palette[1024] = [0, 0, 0, 255];
+      break;
+    case 'kairo':
+      // outer areas
+      for (let i = 0; i < 32; i++) {
+        let cc1 = Math.floor(i * 127 / 31);
+        let cc2 = 170 - Math.floor(i * 43 / 31);
+        palette[i] = [cc1, cc2, cc1, 255];
+      }
+      // inner areas
+      for (let i = 0; i < 51; i++) {
+        let cc = Math.floor(i * 170 / 50);
+        palette[32 + i] = [cc, 0, (170-cc), 255];
+      }
+      // corona
+      for (let i = 0; i < 101; i++) {
+        let cc = Math.floor(i * 200 / 100);
+        palette[83 + i] = [255, cc, 0, 255];
+      }
+      // inner corona
+      for (let i = 0; i < 201; i++) {
+        let cc1 = 255 - Math.floor(i * 85 / 200);
+        let cc2 = 200 - Math.floor(i * 30 / 200);
+        let cc3 = Math.floor(i * 170 / 200);
+        palette[184 + i] = [cc1, cc2, cc3, 255];
+      }
+      for (let i = 0; i < 301; i++) {
+        let cc1 = 170 - Math.floor(i * 43 / 300);
+        let cc2 = 170 + Math.floor(i * 85 / 300);
+        palette[385 + i] = [cc1, cc1, cc2, 255];
+      }
+      for (let i = 0; i < 338; i++) {
+        let cc = 127 + Math.floor(i * 128 / 337);
+        palette[686 + i] = [cc, cc, 255, 255];
+      }
+      palette[1024] = [0, 0, 0, 255];
+      break;
+    case 'rainbow-linear1':
+      for (let i = 0; i < 256; i++) {
+        palette[i] = [i, 0, 0, 255];
+        palette[256 + i] = [255, i, 0, 255];
+        palette[512 + i] = [255 - i, 255, i, 255];
+        palette[768 + i] = [i, 255-i, 255, 255];
+      }
+      palette[1024] = [0, 0, 0, 255];
+      break;
+    case 'rainbow-squared1':
+      for (let i = 0; i < 34; i++) {
+        let cc = Math.floor(i * 255 / 33);
+        palette[i] = [cc, 0, 0, 255];
+      }
+      for (let i = 0; i < 137; i++) {
+        let cc = Math.floor(i * 255 / 136);
+        palette[34 + i] = [255, cc, 0, 255];
+      }
+      for (let i = 0; i < 307; i++) {
+        let cc = Math.floor(i * 255 / 306);
+        palette[171 + i] = [255 - cc, 255, cc, 255];
+      }
+      for (let i = 0; i < 546; i++) {
+        let cc = Math.floor(i * 255 / 545);
+        palette[478 + i] = [cc, 255 - cc, 255, 255];
+      }
+      palette[1024] = [0, 0, 0, 255];
+      break;
+    case 'rainbow-linear2':
+      for (let i = 0; i < 205; i++) {
+        let cc = Math.floor(i * 255 / 204);
+        palette[i] = [255, cc, 0, 255];
+        palette[204 + i] = [255 - cc, 255, 0, 255];
+        palette[409 + i] = [0, 255, cc, 255];
+        palette[614 + i] = [0, 255 - cc, 255, 255];
+        palette[819 + i] = [cc, 0, 255, 255];
+      }
+      palette[1024] = [0, 0, 0, 255];
+      break;
+    case 'rainbow-squared2':
+      for (let i = 0; i < 19; i++) {
+        let cc = Math.floor(i * 255 / 18);
+        palette[i] = [255, cc, 0, 255];
+      }
+      for (let i = 0; i < 74; i++) {
+        let cc = Math.floor(i * 255 / 73);
+        palette[19 + i] = [255 - cc, 255, 0, 255];
+      }
+      for (let i = 0; i < 168; i++) {
+        let cc = Math.floor(i * 255 / 167);
+        palette[93 + i] = [0, 255, cc, 255];
+      }
+      for (let i = 0; i < 298; i++) {
+        let cc = Math.floor(i * 255 / 297);
+        palette[261 + i] = [0, 255 - cc, 255, 255];
+      }
+      for (let i = 0; i < 465; i++) {
+        let cc = Math.floor(i * 255 / 464);
+        palette[559 + i] = [cc, 0, 255, 255];
+      }
+      palette[1024] = [0, 0, 0, 255];
+      break;
+  }
+  /*
+     'Standard-Palette (QB-Colors)
+     For i = 0 To 1024
+         xx = CInt(i * 500 / 1024 + 2)
+         If xx <= 15 Then clr = xx
+         If xx > 15 Then clr = CInt(Sqr((xx - 15 + 1) * 15 ^ 2 / 485))
+         If xx >= 500 Then clr = 0
+         palette(i) = QBColor(clr)
+     Next
+  */
+  return palette;
+}
+
+function drawPoint(context, img_x, img_y, C, iterMax, algorithm) {
+  var itVal;
+  switch (algorithm) {
+    case 'oo':
+      itVal = mandelbrotValueOO(C, iterMax);
+      break;
+    case 'numeric':
+    default:
+      itVal = mandelbrotValueNumeric(C, iterMax);
+      break;
+  }
+  return getColor(itVal, iterMax);
+}
+
+/***** pure UI functions *****/
+
+var zoomstart;
+var imgBackup;
+
+let imgEvHandler = {
+  handleEvent: function(aEvent) {
+    let canvas = document.getElementById("mbrotImage");
+    let context = canvas.getContext("2d");
+    switch (aEvent.type) {
+      case 'mousedown':
+      case 'touchstart':
+        if (aEvent.button == 0) {
+          // left button - start dragzoom
+          zoomstart = {x: aEvent.clientX - canvas.offsetLeft,
+                       y: aEvent.clientY - canvas.offsetTop};
+          imgBackup = context.getImageData(0, 0, canvas.width, canvas.height);
+        }
+        break;
+      case 'mouseup':
+      case 'touchend':
+        if (aEvent.button == 0 && zoomstart) {
+          context.putImageData(imgBackup, 0, 0);
+          let zoomend = {x: aEvent.clientX - canvas.offsetLeft,
+                        y: aEvent.clientY - canvas.offsetTop};
+
+          // make sure zoomend is bigger than zoomstart
+          if ((zoomend.x == zoomstart.x) || (zoomend.y == zoomstart.y)) {
+            // cannot zoom what has no area, discard it
+            zoomstart = undefined;
+            return;
+          }
+          if (zoomend.x < zoomstart.x)
+            [zoomend.x, zoomstart.x] = [zoomstart.x, zoomend.x];
+          if (zoomend.y < zoomstart.y)
+            [zoomend.y, zoomstart.y] = [zoomstart.y, zoomend.y];
+
+          // determine new "coordinates"
+          let CWidth = gCurrentImageData.C_max.r - gCurrentImageData.C_min.r;
+          let CHeight = gCurrentImageData.C_max.i - gCurrentImageData.C_min.i;
+          let newC_min = new complex(
+              gCurrentImageData.C_min.r + zoomstart.x / gCurrentImageData.iWidth * CWidth,
+              gCurrentImageData.C_min.i + zoomstart.y / gCurrentImageData.iHeight * CHeight);
+          let newC_max = new complex(
+              gCurrentImageData.C_min.r + zoomend.x / gCurrentImageData.iWidth * CWidth,
+              gCurrentImageData.C_min.i + zoomend.y / gCurrentImageData.iHeight * CHeight);
+
+          adjustCoordsAndDraw(newC_min, newC_max);
+        }
+        zoomstart = undefined;
+        break;
+      case 'mousemove':
+      case 'touchmove':
+        if (aEvent.button == 0 && zoomstart) {
+          context.putImageData(imgBackup, 0, 0);
+          context.strokeStyle = "rgb(255,255,31)";
+          context.strokeRect(zoomstart.x, zoomstart.y,
+                             aEvent.clientX - canvas.offsetLeft - zoomstart.x,
+                             aEvent.clientY - canvas.offsetTop - zoomstart.y);
+        }
+      break;
+    }
+  }
+};
+
+function saveImage() {
+  const nsIFilePicker = Components.interfaces.nsIFilePicker;
+  let fp = null;
+  try {
+    fp = Components.classes["@mozilla.org/filepicker;1"]
+                   .createInstance(nsIFilePicker);
+  } catch (e) {}
+  if (!fp) return;
+  let promptString = gMbrotBundle.getString("savePrompt");
+  fp.init(window, promptString, nsIFilePicker.modeSave);
+  fp.appendFilter(gMbrotBundle.getString("pngFilterName"), "*.png");
+  fp.defaultString = "mandelbrot.png";
+
+  let fpResult = fp.show();
+  if (fpResult != nsIFilePicker.returnCancel) {
+    saveCanvas(document.getElementById("mbrotImage"), fp.file);
+  }
+}
+
+function exitMandelbrot() {
+  var appInfo = Components.classes["@mozilla.org/xre/app-info;1"]
+                          .getService(Components.interfaces.nsIXULAppInfo);
+  if (appInfo.ID == "mandelbrot@kairo.at")
+    quitApp(false);
+  else
+    window.close();
+}
+
+function updateBookmarkMenu(aParent) {
+  document.getElementById("bookmarkSave").disabled =
+    (!document.getElementById("drawButton").hidden || (gStartTime > 0));
+
+  while (aParent.hasChildNodes() &&
+         aParent.lastChild.id != "bookmarkSeparator")
+    aParent.removeChild(aParent.lastChild);
+
+  let file = Components.classes["@mozilla.org/file/directory_service;1"]
+                       .getService(Components.interfaces.nsIProperties)
+                       .get("ProfD", Components.interfaces.nsIFile);
+  file.append("mandelbookmarks.sqlite");
+  if (file.exists()) {
+    let connection = Components.classes["@mozilla.org/storage/service;1"]
+                               .getService(Components.interfaces.mozIStorageService)
+                               .openDatabase(file);
+    try {
+      if (connection.tableExists("bookmarks")) {
+        let statement = connection.createStatement(
+            "SELECT name,ROWID FROM bookmarks ORDER BY ROWID ASC");
+        while (statement.executeStep()) {
+          let newItem = aParent.appendChild(document.createElement("menuitem"));
+          newItem.setAttribute("label", statement.getString(0));
+          newItem.setAttribute("bmRowID", statement.getString(1));
+        }
+        statement.reset();
+        statement.finalize();
+        return;
+      }
+    } finally {
+      connection.close();
+    }
+  }
+  // Create the "Nothing Available" Menu item and disable it.
+  let na = aParent.appendChild(document.createElement("menuitem"));
+  na.setAttribute("label", gMbrotBundle.getString("noBookmarks"));
+  na.setAttribute("disabled", "true");
+}
+
+function callBookmark(evtarget) {
+  if (evtarget.id == "bookmarkSave" || evtarget.id == "bookmarkSeparator")
+    return;
+  if (evtarget.id == "bookmarkOverview") {
+    adjustCoordsAndDraw(new complex(0,0), new complex(0,0));
+    return;
+  }
+
+  if (evtarget.getAttribute('bmRowID')) {
+    let iterMax = 0;
+    let C_min = null;
+    let C_max = null;
+
+    let file = Components.classes["@mozilla.org/file/directory_service;1"]
+                         .getService(Components.interfaces.nsIProperties)
+                         .get("ProfD", Components.interfaces.nsIFile);
+    file.append("mandelbookmarks.sqlite");
+    let connection = Components.classes["@mozilla.org/storage/service;1"]
+                               .getService(Components.interfaces.mozIStorageService)
+                               .openDatabase(file);
+    let statement = connection.createStatement(
+        "SELECT iteration_max,Cr_min,Cr_max,Ci_min,Ci_max FROM bookmarks WHERE ROWID=?1");
+    statement.bindStringParameter(0, evtarget.getAttribute('bmRowID'));
+    while (statement.executeStep()) {
+      iterMax = statement.getInt32(0);
+      C_min = new complex(statement.getDouble(1), statement.getDouble(3));
+      C_max = new complex(statement.getDouble(2), statement.getDouble(4));
+    }
+    statement.finalize();
+    connection.close();
+
+    if (iterMax && C_min && C_max) {
+      gPref.setIntPref("mandelbrot.iteration_max", iterMax);
+      adjustCoordsAndDraw(C_min, C_max);
+    }
+  }
+}
+
+function saveBookmark() {
+  // retrieve wanted bookmark name with a prompt
+  let prompts = Components.classes["@mozilla.org/embedcomp/prompt-service;1"]
+                          .getService(Components.interfaces.nsIPromptService);
+  let input = {value: ""}; // empty default value
+  let ok = prompts.prompt(null, gMbrotBundle.getString("saveBookmarkTitle"), gMbrotBundle.getString("saveBookmarkLabel"), input, null, {});
+  // ok is true if OK is pressed, false if Cancel. input.value holds the value of the edit field if "OK" was pressed.
+  if (!ok || !input.value)
+    return
+
+  let bmName = input.value;
+
+  // Open or create the bookmarks database.
+  let file = Components.classes["@mozilla.org/file/directory_service;1"]
+                       .getService(Components.interfaces.nsIProperties)
+                       .get("ProfD", Components.interfaces.nsIFile);
+  file.append("mandelbookmarks.sqlite");
+  let connection = Components.classes["@mozilla.org/storage/service;1"]
+                             .getService(Components.interfaces.mozIStorageService)
+                             .openDatabase(file);
+  connection.beginTransaction();
+  if (!connection.tableExists("bookmarks"))
+    connection.createTable("bookmarks", "name TEXT, iteration_max INTEGER, Cr_min REAL, Cr_max REAL, Ci_min REAL, Ci_max REAL");
+  // NULL. The value is a NULL value.
+  // INTEGER. The value is a signed integer, stored in 1, 2, 3, 4, 6, or 8 bytes depending on the magnitude of the value.
+  // REAL. The value is a floating point value, stored as an 8-byte IEEE floating point number.
+  // TEXT. The value is a text string, stored using the database encoding (UTF-8, UTF-16BE or UTF-16-LE).
+
+  // Put value of the current image into the bookmarks table
+  let statement = connection.createStatement(
+      "INSERT INTO bookmarks (name,iteration_max,Cr_min,Cr_max,Ci_min,Ci_max) VALUES (?1,?2,?3,?4,?5,?6)");
+  statement.bindStringParameter(0, bmName);
+  statement.bindStringParameter(1, gCurrentImageData.iterMax);
+  statement.bindStringParameter(2, gCurrentImageData.C_min.r);
+  statement.bindStringParameter(3, gCurrentImageData.C_max.r);
+  statement.bindStringParameter(4, gCurrentImageData.C_min.i);
+  statement.bindStringParameter(5, gCurrentImageData.C_max.i);
+  statement.execute();
+  statement.finalize();
+  connection.commitTransaction();
+  connection.close();
+}
+
+function updateIterMenu() {
+  let currentIter = getAdjustPref("iteration_max");
+
+  let popup = document.getElementById("menu_iterPopup");
+  let item = popup.firstChild;
+  while (item) {
+    if (item.getAttribute("name") == "iter") {
+      if (item.getAttribute("value") == currentIter)
+        item.setAttribute("checked","true");
+      else
+        item.removeAttribute("checked");
+    }
+    item = item.nextSibling;
+  }
+}
+
+function setIter(aIter) {
+  gPref.setIntPref("mandelbrot.iteration_max", aIter);
+}
+
+function updatePaletteMenu() {
+  let currentPalette = getAdjustPref("color_palette");
+  if (!gColorPalette || !gColorPalette.length)
+    gColorPalette = getColorPalette(currentPalette);
+
+  let popup = document.getElementById("menu_palettePopup");
+  let item = popup.firstChild;
+  while (item) {
+    if (item.getAttribute("name") == "palette") {
+      if (item.getAttribute("value") == currentPalette)
+        item.setAttribute("checked", "true");
+      else
+        item.removeAttribute("checked");
+    }
+    item = item.nextSibling;
+  }
+}
+
+function setPalette(aPaletteID) {
+  gPref.setCharPref("mandelbrot.color_palette", aPaletteID);
+  gColorPalette = getColorPalette(aPaletteID);
+}
+
+function imgSettings() {
+  let anchor = null;
+  let position = "before_start";
+  if (document.getElementById("mandelbrotWindow").nodeName == "page") {
+    anchor = document.getElementById("mandelbrotToolbar");
+  }
+  else {
+    anchor = document.getElementById("mandelbrotMenubar");
+    position = "after_start";
+  }
+  document.getElementById("imgSettingsPanel").showPopup(anchor, position);
+}
+
+function updateDebugMenu() {
+  let scope = (document.getElementById("mandelbrotWindow").nodeName == "page") ? "content" : "chrome";
+  try {
+    // This throws in versions that don't have JaegerMonkey yet --> catch block
+    gPref.getBoolPref("javascript.options.methodjit." + scope);
+
+    // We have JaegerMonkey, i.e. two prefs for trace/method JIT
+    for each (let type in ["tracejit", "methodjit"]) {
+      let jitMenuItem = document.getElementById(type + "Enabled");
+      jitMenuItem.setAttribute("checked", gPref.getBoolPref("javascript.options." + type + "." + scope));
+    }
+  }
+  catch (e) {
+    // We have TraceMonkey only, i.e. one JIT pref, care only that is displayed
+    for each (let type in ["tracejit", "methodjit"])
+      document.getElementById(type + "Enabled").hidden = true;
+    let jitMenuItem = document.getElementById("jitEnabled");
+    jitMenuItem.hidden = false;
+    jitMenuItem.setAttribute("checked", gPref.getBoolPref("javascript.options.jit." + scope));
+  }
+}
+
+function toggleJITState(jitMenuItem, jittype) {
+  let scope = (document.getElementById("mandelbrotWindow").nodeName == "page") ? "content" : "chrome";
+  let jitpref = "javascript.options." + jittype + "jit." + scope;
+  let jitEnabled = !gPref.getBoolPref(jitpref);
+  gPref.setBoolPref(jitpref, jitEnabled)
+  jitMenuItem.setAttribute("checked", jitEnabled ? "true" : "false");
+}
+
+function updateAlgoMenu() {
+  let currentAlgo = getAdjustPref("use_algorithm");
+
+  let popup = document.getElementById("menu_algoPopup");
+  let item = popup.firstChild;
+  while (item) {
+    if (item.getAttribute("name") == "algorithm") {
+      if (item.getAttribute("value") == currentAlgo)
+        item.setAttribute("checked", "true");
+      else
+        item.removeAttribute("checked");
+    }
+    item = item.nextSibling;
+  }
+}
+
+function setAlgorithm(algoID) {
+  gPref.setCharPref("mandelbrot.use_algorithm", algoID);
+}
+
+function initImgSettings() {
+  // Get values from prefs.
+  for each (let coord in ["Cr", "Ci"]) {
+    let coord_vals = getAdjustPref("last_image." + coord + "_*");
+    document.getElementById("is_" + coord + "_min").value = coord_vals[coord + "_min"];
+    document.getElementById("is_" + coord + "_max").value = coord_vals[coord + "_max"];
+  }
+  for each (let dim in ["width", "height"]) {
+    document.getElementById("is_img_" + dim).value = getAdjustPref("image." + dim);
+  }
+  document.getElementById("is_syncProp").checked = getAdjustPref("syncProportions");
+
+  // Calculate scales.
+  recalcCoord("Cr", "scale");
+  recalcCoord("Ci", "scale");
+
+  // Clear the preview.
+  let canvas = document.getElementById("is_mbrotPreview");
+  let context = canvas.getContext("2d");
+  context.fillStyle = "rgba(255, 255, 255, 127)";
+  context.fillRect(0, 0, canvas.width, canvas.height);
+}
+
+function closeImgSettings() {
+  // Hide popup, which will automatically make a call to save values.
+  document.getElementById("imgSettingsPanel").hidePopup();
+}
+
+function saveImgSettings() {
+  // Get values to prefs.
+  for each (let coord in ["Cr_min", "Cr_max", "Ci_min", "Ci_max"]) {
+    gPref.setCharPref("mandelbrot.last_image." + coord,
+                      document.getElementById("is_" + coord).value);
+  }
+  for each (let dim in ["width", "height"]) {
+    gPref.setIntPref("mandelbrot.image." + dim,
+                     document.getElementById("is_img_" + dim).value);
+  }
+  gPref.setBoolPref("mandelbrot.syncProportions",
+                    document.getElementById("is_syncProp").checked);
+}
+
+function checkISValue(textbox, type) {
+  if (type == "coord") {
+    textbox.value = roundCoord(parseFloat(textbox.value));
+  }
+  else if (type == "dim") {
+    textbox.value = parseInt(textbox.value);
+  }
+}
+
+function drawPreview() {
+  let canvas = document.getElementById("is_mbrotPreview");
+  let context = canvas.getContext("2d");
+
+  if (document.getElementById("is_img_width").value /
+      document.getElementById("is_img_height").value
+        < 80 / 50) {
+    canvas.height = 50;
+    canvas.width = canvas.height *
+      document.getElementById("is_img_width").value /
+      document.getElementById("is_img_height").value;
+  }
+  else {
+    canvas.width = 80;
+    canvas.height = canvas.width *
+      document.getElementById("is_imgHeight").value /
+      document.getElementById("is_imgWidth").value;
+  }
+
+  let Cr_min = parseFloat(document.getElementById("is_Cr_min").value);
+  let Cr_max = parseFloat(document.getElementById("is_Cr_max").value);
+  if ((Cr_min < -2) || (Cr_min > 2) ||
+      (Cr_max < -2) || (Cr_max > 2) || (Cr_min >= Cr_max)) {
+    Cr_min = -2.0; Cr_max = 1.0;
+  }
+
+  let Ci_min = parseFloat(document.getElementById("is_Ci_min").value);
+  let Ci_max = parseFloat(document.getElementById("is_Ci_max").value);
+  if ((Ci_min < -2) || (Ci_min > 2) ||
+      (Ci_max < -2) || (Ci_max > 2) || (Ci_min >= Ci_max)) {
+    Ci_min = -2.0; Ci_max = 1.0;
+  }
+
+  let iterMax = getAdjustPref("iteration_max");
+  let algorithm = getAdjustPref("use_algorithm");
+
+  context.fillStyle = "rgba(255, 255, 255, 127)";
+  context.fillRect(0, 0, canvas.width, canvas.height);
+
+  let currentPalette = getAdjustPref("color_palette");
+  gColorPalette = getColorPalette(currentPalette);
+
+  drawLine(0, [Cr_min, Cr_max, Ci_min, Ci_max],
+              canvas, context, iterMax, algorithm);
+}
+
+function recalcCoord(coord, target) {
+  let othercoord = (coord == "Ci") ? "Cr" : "Ci";
+  let owndim = (coord == "Ci") ? "height" : "width";
+  let otherdim = (coord == "Ci") ? "width" : "height";
+  let myscale;
+  if (target == "scale") {
+    myscale =
+      parseFloat(document.getElementById("is_" + coord + "_max").value) -
+      parseFloat(document.getElementById("is_" + coord + "_min").value);
+    document.getElementById("is_" + coord + "_scale").value = roundCoord(myscale);
+  }
+  else if (target == 'max') {
+    let mymax =
+      parseFloat(document.getElementById("is_" + coord + "_min").value) +
+      parseFloat(document.getElementById("is_" + coord + "_scale").value);
+    document.getElementById("is_" + coord + "_max").value = roundCoord(mymax);
+    myscale = document.getElementById("is_" + coord + "_scale").value;
+  }
+  if (document.getElementById("is_syncProp").checked) {
+    let otherscale = myscale *
+      document.getElementById("is_img_" + otherdim).value /
+      document.getElementById("is_img_" + owndim).value;
+    document.getElementById("is_" + othercoord + "_scale").value = roundCoord(otherscale);
+    let othermax =
+      parseFloat(document.getElementById("is_" + othercoord + "_min").value) +
+      parseFloat(document.getElementById("is_" + othercoord + "_scale").value);
+    document.getElementById("is_" + othercoord + "_max").value = roundCoord(othermax);
+  }
+}
+
+function checkProportions() {
+  if (!document.getElementById("is_syncProp").checked) {
+    recalcCoord("Cr", "scale");
+  }
+}
+
+function roundCoord(floatval) {
+  // We should round to 10 decimals here or so
+  return parseFloat(floatval.toFixed(10));
+}
+
+/***** helper functions from external sources *****/
+
+// function below is based on http://developer.mozilla.org/en/docs/Code_snippets:Canvas
+// custom modifications:
+//   - use "a"-prefix on function arguments
+//   - take an nsILocalFile as aDestFile argument
+//   - always do silent download
+function saveCanvas(aCanvas, aDestFile) {
+  // create a data url from the canvas and then create URIs of the source and targets  
+  var io = Components.classes["@mozilla.org/network/io-service;1"]
+                     .getService(Components.interfaces.nsIIOService);
+  var source = io.newURI(aCanvas.toDataURL("image/png", ""), "UTF8", null);
+
+  // prepare to save the canvas data
+  var persist = Components.classes["@mozilla.org/embedding/browser/nsWebBrowserPersist;1"]
+                          .createInstance(Components.interfaces.nsIWebBrowserPersist);
+
+  persist.persistFlags = Components.interfaces.nsIWebBrowserPersist.PERSIST_FLAGS_REPLACE_EXISTING_FILES;
+  persist.persistFlags |= Components.interfaces.nsIWebBrowserPersist.PERSIST_FLAGS_AUTODETECT_APPLY_CONVERSION;
+
+  // save the canvas data to the file
+  persist.saveURI(source, null, null, null, null, aDestFile);
+}