src/com/android/gallery3d/filtershow/pipeline/ImagePreset.java

   1 /*
   2  * Copyright (C) 2012 The Android Open Source Project
   3  *
   4  * Licensed under the Apache License, Version 2.0 (the "License");
   5  * you may not use this file except in compliance with the License.
   6  * You may obtain a copy of the License at
   7  *
   8  *      http://www.apache.org/licenses/LICENSE-2.0
   9  *
  10  * Unless required by applicable law or agreed to in writing, software
  11  * distributed under the License is distributed on an "AS IS" BASIS,
  12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  13  * See the License for the specific language governing permissions and
  14  * limitations under the License.
  15  */
  16
  17 package com.android.gallery3d.filtershow.pipeline;
  18
  19 import android.graphics.Bitmap;
  20 import android.graphics.Rect;
  21 import android.support.v8.renderscript.Allocation;
  22 import android.util.JsonReader;
  23 import android.util.JsonWriter;
  24 import android.util.Log;
  25
  26 import com.android.gallery3d.R;
  27 import com.android.gallery3d.filtershow.cache.BitmapCache;
  28 import com.android.gallery3d.filtershow.cache.ImageLoader;
  29 import com.android.gallery3d.filtershow.filters.BaseFiltersManager;
  30 import com.android.gallery3d.filtershow.filters.FilterCropRepresentation;
  31 import com.android.gallery3d.filtershow.filters.FilterFxRepresentation;
  32 import com.android.gallery3d.filtershow.filters.FilterImageBorderRepresentation;
  33 import com.android.gallery3d.filtershow.filters.FilterMirrorRepresentation;
  34 import com.android.gallery3d.filtershow.filters.FilterRepresentation;
  35 import com.android.gallery3d.filtershow.filters.FilterRotateRepresentation;
  36 import com.android.gallery3d.filtershow.filters.FilterStraightenRepresentation;
  37 import com.android.gallery3d.filtershow.filters.FilterUserPresetRepresentation;
  38 import com.android.gallery3d.filtershow.filters.FiltersManager;
  39 import com.android.gallery3d.filtershow.filters.ImageFilter;
  40 import com.android.gallery3d.filtershow.imageshow.GeometryMathUtils;
  41 import com.android.gallery3d.filtershow.imageshow.MasterImage;
  42 import com.android.gallery3d.filtershow.state.State;
  43 import com.android.gallery3d.filtershow.state.StateAdapter;
  44 import com.android.gallery3d.util.UsageStatistics;
  45
  46 import java.io.IOException;
  47 import java.io.StringReader;
  48 import java.io.StringWriter;
  49 import java.util.ArrayList;
  50 import java.util.Collection;
  51 import java.util.Vector;
  52
  53 public class ImagePreset {
  54
  55     private static final String LOGTAG = "ImagePreset";
  56
  57     private Vector<FilterRepresentation> mFilters = new Vector<FilterRepresentation>();
  58
  59     private boolean mDoApplyGeometry = true;
  60     private boolean mDoApplyFilters = true;
  61
  62     private boolean mPartialRendering = false;
  63     private Rect mPartialRenderingBounds;
  64     private static final boolean DEBUG = false;
  65
  66     public ImagePreset() {
  67     }
  68
  69     public ImagePreset(ImagePreset source) {
  70         for (int i = 0; i < source.mFilters.size(); i++) {
  71             FilterRepresentation sourceRepresentation = source.mFilters.elementAt(i);
  72             mFilters.add(sourceRepresentation.copy());
  73         }
  74     }
  75
  76     public Vector<FilterRepresentation> getFilters() {
  77         return mFilters;
  78     }
  79
  80     public FilterRepresentation getFilterRepresentation(int position) {
  81         FilterRepresentation representation = null;
  82
  83         representation = mFilters.elementAt(position).copy();
  84
  85         return representation;
  86     }
  87
  88     private static boolean sameSerializationName(String a, String b) {
  89         if (a != null && b != null) {
  90             return a.equals(b);
  91         } else {
  92             return a == null && b == null;
  93         }
  94     }
  95
  96     public static boolean sameSerializationName(FilterRepresentation a, FilterRepresentation b) {
  97         if (a == null || b == null) {
  98             return false;
  99         }
 100         return sameSerializationName(a.getSerializationName(), b.getSerializationName());
 101     }
 102
 103     public int getPositionForRepresentation(FilterRepresentation representation) {
 104         for (int i = 0; i < mFilters.size(); i++) {
 105             if (sameSerializationName(mFilters.elementAt(i), representation)) {
 106                 return i;
 107             }
 108         }
 109         return -1;
 110     }
 111
 112     private FilterRepresentation getFilterRepresentationForType(int type) {
 113         for (int i = 0; i < mFilters.size(); i++) {
 114             if (mFilters.elementAt(i).getFilterType() == type) {
 115                 return mFilters.elementAt(i);
 116             }
 117         }
 118         return null;
 119     }
 120
 121     public int getPositionForType(int type) {
 122         for (int i = 0; i < mFilters.size(); i++) {
 123             if (mFilters.elementAt(i).getFilterType() == type) {
 124                 return i;
 125             }
 126         }
 127         return -1;
 128     }
 129
 130     public FilterRepresentation getFilterRepresentationCopyFrom(
 131             FilterRepresentation filterRepresentation) {
 132         // TODO: add concept of position in the filters (to allow multiple instances)
 133         if (filterRepresentation == null) {
 134             return null;
 135         }
 136         int position = getPositionForRepresentation(filterRepresentation);
 137         if (position == -1) {
 138             return null;
 139         }
 140         FilterRepresentation representation = mFilters.elementAt(position);
 141         if (representation != null) {
 142             representation = representation.copy();
 143         }
 144         return representation;
 145     }
 146
 147     public void updateFilterRepresentations(Collection<FilterRepresentation> reps) {
 148         for (FilterRepresentation r : reps) {
 149             updateOrAddFilterRepresentation(r);
 150         }
 151     }
 152
 153     public void updateOrAddFilterRepresentation(FilterRepresentation rep) {
 154         int pos = getPositionForRepresentation(rep);
 155         if (pos != -1) {
 156             mFilters.elementAt(pos).useParametersFrom(rep);
 157         } else {
 158             addFilter(rep.copy());
 159         }
 160     }
 161
 162     public void setDoApplyGeometry(boolean value) {
 163         mDoApplyGeometry = value;
 164     }
 165
 166     public void setDoApplyFilters(boolean value) {
 167         mDoApplyFilters = value;
 168     }
 169
 170     public boolean getDoApplyFilters() {
 171         return mDoApplyFilters;
 172     }
 173
 174     public boolean hasModifications() {
 175         for (int i = 0; i < mFilters.size(); i++) {
 176             FilterRepresentation filter = mFilters.elementAt(i);
 177             if (!filter.isNil()) {
 178                 return true;
 179             }
 180         }
 181         return false;
 182     }
 183
 184     public boolean contains(byte type) {
 185         for (FilterRepresentation representation : mFilters) {
 186             if (representation.getFilterType() == type
 187                     && !representation.isNil()) {
 188                 return true;
 189             }
 190         }
 191         return false;
 192     }
 193
 194     public boolean isPanoramaSafe() {
 195         for (FilterRepresentation representation : mFilters) {
 196             if (representation.getFilterType() == FilterRepresentation.TYPE_GEOMETRY
 197                     && !representation.isNil()) {
 198                 return false;
 199             }
 200             if (representation.getFilterType() == FilterRepresentation.TYPE_BORDER
 201                     && !representation.isNil()) {
 202                 return false;
 203             }
 204             if (representation.getFilterType() == FilterRepresentation.TYPE_VIGNETTE
 205                     && !representation.isNil()) {
 206                 return false;
 207             }
 208             if (representation.getFilterType() == FilterRepresentation.TYPE_TINYPLANET
 209                     && !representation.isNil()) {
 210                 return false;
 211             }
 212         }
 213         return true;
 214     }
 215
 216     public boolean same(ImagePreset preset) {
 217         if (preset == null) {
 218             return false;
 219         }
 220
 221         if (preset.mFilters.size() != mFilters.size()) {
 222             return false;
 223         }
 224
 225         if (mDoApplyGeometry != preset.mDoApplyGeometry) {
 226             return false;
 227         }
 228
 229         if (mDoApplyFilters != preset.mDoApplyFilters) {
 230             if (mFilters.size() > 0 || preset.mFilters.size() > 0) {
 231                 return false;
 232             }
 233         }
 234
 235         if (mDoApplyFilters && preset.mDoApplyFilters) {
 236             for (int i = 0; i < preset.mFilters.size(); i++) {
 237                 FilterRepresentation a = preset.mFilters.elementAt(i);
 238                 FilterRepresentation b = mFilters.elementAt(i);
 239
 240                 if (!a.same(b)) {
 241                     return false;
 242                 }
 243             }
 244         }
 245
 246         return true;
 247     }
 248
 249     public boolean equals(ImagePreset preset) {
 250         if (preset == null) {
 251             return false;
 252         }
 253
 254         if (preset.mFilters.size() != mFilters.size()) {
 255             return false;
 256         }
 257
 258         if (mDoApplyGeometry != preset.mDoApplyGeometry) {
 259             return false;
 260         }
 261
 262         if (mDoApplyFilters != preset.mDoApplyFilters) {
 263             if (mFilters.size() > 0 || preset.mFilters.size() > 0) {
 264                 return false;
 265             }
 266         }
 267
 268         for (int i = 0; i < preset.mFilters.size(); i++) {
 269             FilterRepresentation a = preset.mFilters.elementAt(i);
 270             FilterRepresentation b = mFilters.elementAt(i);
 271
 272             if (!a.equals(b)) {
 273                 return false;
 274             }
 275         }
 276
 277         return true;
 278     }
 279
 280     public int similarUpTo(ImagePreset preset) {
 281         for (int i = 0; i < preset.mFilters.size(); i++) {
 282             FilterRepresentation a = preset.mFilters.elementAt(i);
 283             if (i < mFilters.size()) {
 284                 FilterRepresentation b = mFilters.elementAt(i);
 285                 if (!a.same(b)) {
 286                     return i;
 287                 }
 288                 if (!a.equals(b)) {
 289                     return i;
 290                 }
 291             } else {
 292                 return i;
 293             }
 294         }
 295         return preset.mFilters.size();
 296     }
 297
 298     public void showFilters() {
 299         Log.v(LOGTAG, "\\\\\\ showFilters -- " + mFilters.size() + " filters");
 300         int n = 0;
 301         for (FilterRepresentation representation : mFilters) {
 302             Log.v(LOGTAG, " filter " + n + " : " + representation.toString());
 303             n++;
 304         }
 305         Log.v(LOGTAG, "/// showFilters -- " + mFilters.size() + " filters");
 306     }
 307
 308     public FilterRepresentation getLastRepresentation() {
 309         if (mFilters.size() > 0) {
 310             return mFilters.lastElement();
 311         }
 312         return null;
 313     }
 314
 315     public void removeFilter(FilterRepresentation filterRepresentation) {
 316         if (filterRepresentation.getFilterType() == FilterRepresentation.TYPE_BORDER) {
 317             for (int i = 0; i < mFilters.size(); i++) {
 318                 if (mFilters.elementAt(i).getFilterType()
 319                 == filterRepresentation.getFilterType()) {
 320                     mFilters.remove(i);
 321                     break;
 322                 }
 323             }
 324         } else {
 325             for (int i = 0; i < mFilters.size(); i++) {
 326                 if (sameSerializationName(mFilters.elementAt(i), filterRepresentation)) {
 327                     mFilters.remove(i);
 328                     break;
 329                 }
 330             }
 331         }
 332     }
 333
 334     // If the filter is an "None" effect or border, then just don't add this filter.
 335     public void addFilter(FilterRepresentation representation) {
 336         if (representation instanceof FilterUserPresetRepresentation) {
 337             ImagePreset preset = ((FilterUserPresetRepresentation) representation).getImagePreset();
 338             // user preset replace everything but geometry
 339             mFilters.clear();
 340             for (int i = 0; i < preset.nbFilters(); i++) {
 341                 addFilter(preset.getFilterRepresentation(i));
 342             }
 343             mFilters.add(representation);
 344         } else if (representation.getFilterType() == FilterRepresentation.TYPE_GEOMETRY) {
 345             // Add geometry filter, removing duplicates and do-nothing operations.
 346             for (int i = 0; i < mFilters.size(); i++) {
 347                 if (sameSerializationName(representation, mFilters.elementAt(i))) {
 348                     mFilters.remove(i);
 349                 }
 350             }
 351             int index = 0;
 352             for (; index < mFilters.size(); index++) {
 353                 FilterRepresentation rep = mFilters.elementAt(index);
 354                 if (rep.getFilterType() != FilterRepresentation.TYPE_GEOMETRY) {
 355                     break;
 356                 }
 357             }
 358             if (!representation.isNil()) {
 359                 mFilters.insertElementAt(representation, index);
 360             }
 361         } else if (representation.getFilterType() == FilterRepresentation.TYPE_BORDER) {
 362             removeFilter(representation);
 363             if (!isNoneBorderFilter(representation)) {
 364                 mFilters.add(representation);
 365             }
 366         } else if (representation.getFilterType() == FilterRepresentation.TYPE_FX) {
 367             boolean found = false;
 368             for (int i = 0; i < mFilters.size(); i++) {
 369                 FilterRepresentation current = mFilters.elementAt(i);
 370                 int type = current.getFilterType();
 371                 if (found) {
 372                     if (type != FilterRepresentation.TYPE_VIGNETTE) {
 373                         mFilters.remove(i);
 374                         continue;
 375                     }
 376                 }
 377                 if (type == FilterRepresentation.TYPE_FX) {
 378                     if (current instanceof FilterUserPresetRepresentation) {
 379                         ImagePreset preset = ((FilterUserPresetRepresentation) current)
 380                                 .getImagePreset();
 381                         // If we had an existing user preset, let's remove all the presets that
 382                         // were added by it
 383                         for (int j = 0; j < preset.nbFilters(); j++) {
 384                             FilterRepresentation rep = preset.getFilterRepresentation(j);
 385                             int pos = getPositionForRepresentation(rep);
 386                             if (pos != -1) {
 387                                 mFilters.remove(pos);
 388                             }
 389                         }
 390                         int pos = getPositionForRepresentation(current);
 391                         if (pos != -1) {
 392                             mFilters.remove(pos);
 393                         } else {
 394                             pos = 0;
 395                         }
 396                         if (!isNoneFxFilter(representation)) {
 397                             mFilters.add(pos, representation);
 398                         }
 399
 400                     } else {
 401                         mFilters.remove(i);
 402                         if (!isNoneFxFilter(representation)) {
 403                             mFilters.add(i, representation);
 404                         }
 405                     }
 406                     found = true;
 407                 }
 408             }
 409             if (!found) {
 410                 if (!isNoneFxFilter(representation)) {
 411                     mFilters.add(representation);
 412                 }
 413             }
 414         } else {
 415             mFilters.add(representation);
 416         }
 417     }
 418
 419     private boolean isNoneBorderFilter(FilterRepresentation representation) {
 420         return representation instanceof FilterImageBorderRepresentation &&
 421                 ((FilterImageBorderRepresentation) representation).getDrawableResource() == 0;
 422     }
 423
 424     private boolean isNoneFxFilter(FilterRepresentation representation) {
 425         return representation instanceof FilterFxRepresentation &&
 426                 ((FilterFxRepresentation) representation).getNameResource() == R.string.none;
 427     }
 428
 429     public FilterRepresentation getRepresentation(FilterRepresentation filterRepresentation) {
 430         for (int i = 0; i < mFilters.size(); i++) {
 431             FilterRepresentation representation = mFilters.elementAt(i);
 432             if (sameSerializationName(representation, filterRepresentation)) {
 433                 return representation;
 434             }
 435         }
 436         return null;
 437     }
 438
 439     public Bitmap apply(Bitmap original, FilterEnvironment environment) {
 440         Bitmap bitmap = original;
 441         bitmap = applyFilters(bitmap, -1, -1, environment);
 442         return applyBorder(bitmap, environment);
 443     }
 444
 445     public Collection<FilterRepresentation> getGeometryFilters() {
 446         ArrayList<FilterRepresentation> geometry = new ArrayList<FilterRepresentation>();
 447         for (FilterRepresentation r : mFilters) {
 448             if (r.getFilterType() == FilterRepresentation.TYPE_GEOMETRY) {
 449                 geometry.add(r);
 450             }
 451         }
 452         return geometry;
 453     }
 454
 455     public FilterRepresentation getFilterWithSerializationName(String serializationName) {
 456         for (FilterRepresentation r : mFilters) {
 457             if (r != null) {
 458                 if (sameSerializationName(r.getSerializationName(), serializationName)) {
 459                     return r.copy();
 460                 }
 461             }
 462         }
 463         return null;
 464     }
 465
 466     public Rect finalGeometryRect(int width, int height) {
 467         return GeometryMathUtils.finalGeometryRect(width, height, getGeometryFilters());
 468     }
 469
 470     public Bitmap applyGeometry(Bitmap bitmap, FilterEnvironment environment) {
 471         // Apply any transform -- 90 rotate, flip, straighten, crop
 472         // Returns a new bitmap.
 473         if (mDoApplyGeometry) {
 474             Bitmap bmp = GeometryMathUtils.applyGeometryRepresentations(
 475                     getGeometryFilters(), bitmap);
 476             if (bmp != bitmap) {
 477                 environment.cache(bitmap);
 478             }
 479             return bmp;
 480         }
 481         return bitmap;
 482     }
 483
 484     public Bitmap applyBorder(Bitmap bitmap, FilterEnvironment environment) {
 485         // get the border from the list of filters.
 486         FilterRepresentation border = getFilterRepresentationForType(
 487                 FilterRepresentation.TYPE_BORDER);
 488         if (border != null && mDoApplyGeometry) {
 489             bitmap = environment.applyRepresentation(border, bitmap);
 490             if (environment.getQuality() == FilterEnvironment.QUALITY_FINAL) {
 491                 UsageStatistics.onEvent(UsageStatistics.COMPONENT_EDITOR,
 492                         "SaveBorder", border.getSerializationName(), 1);
 493             }
 494         }
 495         return bitmap;
 496     }
 497
 498     public int nbFilters() {
 499         return mFilters.size();
 500     }
 501
 502     public Bitmap applyFilters(Bitmap bitmap, int from, int to, FilterEnvironment environment) {
 503         if (mDoApplyFilters) {
 504             if (from < 0) {
 505                 from = 0;
 506             }
 507             if (to == -1) {
 508                 to = mFilters.size();
 509             }
 510             if (environment.getQuality() == FilterEnvironment.QUALITY_FINAL) {
 511                 UsageStatistics.onEvent(UsageStatistics.COMPONENT_EDITOR,
 512                         "SaveFilters", "Total", to - from + 1);
 513             }
 514             for (int i = from; i < to; i++) {
 515                 FilterRepresentation representation = mFilters.elementAt(i);
 516                 if (representation.getFilterType() == FilterRepresentation.TYPE_GEOMETRY) {
 517                     // skip the geometry as it's already applied.
 518                     continue;
 519                 }
 520                 if (representation.getFilterType() == FilterRepresentation.TYPE_BORDER) {
 521                     // for now, let's skip the border as it will be applied in
 522                     // applyBorder()
 523                     // TODO: might be worth getting rid of applyBorder.
 524                     continue;
 525                 }
 526                 Bitmap tmp = bitmap;
 527                 bitmap = environment.applyRepresentation(representation, bitmap);
 528                 if (tmp != bitmap) {
 529                     environment.cache(tmp);
 530                 }
 531                 if (environment.getQuality() == FilterEnvironment.QUALITY_FINAL) {
 532                     UsageStatistics.onEvent(UsageStatistics.COMPONENT_EDITOR,
 533                             "SaveFilter", representation.getSerializationName(), 1);
 534                 }
 535                 if (environment.needsStop()) {
 536                     return bitmap;
 537                 }
 538             }
 539         }
 540
 541         return bitmap;
 542     }
 543
 544     public void applyBorder(Allocation in, Allocation out,
 545             boolean copyOut, FilterEnvironment environment) {
 546         FilterRepresentation border = getFilterRepresentationForType(
 547                 FilterRepresentation.TYPE_BORDER);
 548         if (border != null && mDoApplyGeometry) {
 549             // TODO: should keep the bitmap around
 550             Allocation bitmapIn = in;
 551             if (copyOut) {
 552                 bitmapIn = Allocation.createTyped(
 553                         CachingPipeline.getRenderScriptContext(), in.getType());
 554                 bitmapIn.copyFrom(out);
 555             }
 556             environment.applyRepresentation(border, bitmapIn, out);
 557         }
 558     }
 559
 560     public void applyFilters(int from, int to, Allocation in, Allocation out,
 561             FilterEnvironment environment) {
 562         if (mDoApplyFilters) {
 563             if (from < 0) {
 564                 from = 0;
 565             }
 566             if (to == -1) {
 567                 to = mFilters.size();
 568             }
 569             for (int i = from; i < to; i++) {
 570                 FilterRepresentation representation = mFilters.elementAt(i);
 571                 if (representation.getFilterType() == FilterRepresentation.TYPE_GEOMETRY
 572                         || representation.getFilterType() == FilterRepresentation.TYPE_BORDER) {
 573                     continue;
 574                 }
 575                 if (i > from) {
 576                     in.copyFrom(out);
 577                 }
 578                 environment.applyRepresentation(representation, in, out);
 579             }
 580         }
 581     }
 582
 583     public boolean canDoPartialRendering() {
 584         if (MasterImage.getImage().getZoomOrientation() != ImageLoader.ORI_NORMAL) {
 585             return false;
 586         }
 587         for (int i = 0; i < mFilters.size(); i++) {
 588             FilterRepresentation representation = mFilters.elementAt(i);
 589             if (!representation.supportsPartialRendering()) {
 590                 return false;
 591             }
 592         }
 593         return true;
 594     }
 595
 596     public void fillImageStateAdapter(StateAdapter imageStateAdapter) {
 597         if (imageStateAdapter == null) {
 598             return;
 599         }
 600         Vector<State> states = new Vector<State>();
 601         for (FilterRepresentation filter : mFilters) {
 602             if (filter instanceof FilterUserPresetRepresentation) {
 603                 // do not show the user preset itself in the state panel
 604                 continue;
 605             }
 606             State state = new State(filter.getName());
 607             state.setFilterRepresentation(filter);
 608             states.add(state);
 609         }
 610         imageStateAdapter.fill(states);
 611     }
 612
 613     public void setPartialRendering(boolean partialRendering, Rect bounds) {
 614         mPartialRendering = partialRendering;
 615         mPartialRenderingBounds = bounds;
 616     }
 617
 618     public boolean isPartialRendering() {
 619         return mPartialRendering;
 620     }
 621
 622     public Rect getPartialRenderingBounds() {
 623         return mPartialRenderingBounds;
 624     }
 625
 626     public Vector<ImageFilter> getUsedFilters(BaseFiltersManager filtersManager) {
 627         Vector<ImageFilter> usedFilters = new Vector<ImageFilter>();
 628         for (int i = 0; i < mFilters.size(); i++) {
 629             FilterRepresentation representation = mFilters.elementAt(i);
 630             ImageFilter filter = filtersManager.getFilterForRepresentation(representation);
 631             usedFilters.add(filter);
 632         }
 633         return usedFilters;
 634     }
 635
 636     public String getJsonString(String name) {
 637         StringWriter swriter = new StringWriter();
 638         try {
 639             JsonWriter writer = new JsonWriter(swriter);
 640             writeJson(writer, name);
 641             writer.close();
 642         } catch (IOException e) {
 643             return null;
 644         }
 645         return swriter.toString();
 646     }
 647
 648     public void writeJson(JsonWriter writer, String name) {
 649         int numFilters = mFilters.size();
 650         try {
 651             writer.beginObject();
 652             for (int i = 0; i < numFilters; i++) {
 653                 FilterRepresentation filter = mFilters.get(i);
 654                 if (filter instanceof FilterUserPresetRepresentation) {
 655                     continue;
 656                 }
 657                 String sname = filter.getSerializationName();
 658                 if (DEBUG) {
 659                     Log.v(LOGTAG, "Serialization: " + sname);
 660                     if (sname == null) {
 661                         Log.v(LOGTAG, "Serialization name null for filter: " + filter);
 662                     }
 663                 }
 664                 writer.name(sname);
 665                 filter.serializeRepresentation(writer);
 666             }
 667             writer.endObject();
 668
 669         } catch (IOException e) {
 670            Log.e(LOGTAG,"Error encoding JASON",e);
 671         }
 672     }
 673
 674     /**
 675      * populates preset from JSON string
 676      *
 677      * @param filterString a JSON string
 678      * @return true on success if false ImagePreset is undefined
 679      */
 680     public boolean readJsonFromString(String filterString) {
 681         if (DEBUG) {
 682             Log.v(LOGTAG, "reading preset: \"" + filterString + "\"");
 683         }
 684         StringReader sreader = new StringReader(filterString);
 685         try {
 686             JsonReader reader = new JsonReader(sreader);
 687             boolean ok = readJson(reader);
 688             if (!ok) {
 689                 reader.close();
 690                 return false;
 691             }
 692             reader.close();
 693         } catch (Exception e) {
 694             Log.e(LOGTAG, "parsing the filter parameters:", e);
 695             return false;
 696         }
 697         return true;
 698     }
 699
 700     /**
 701      * populates preset from JSON stream
 702      *
 703      * @param sreader a JSON string
 704      * @return true on success if false ImagePreset is undefined
 705      */
 706     public boolean readJson(JsonReader sreader) throws IOException {
 707         sreader.beginObject();
 708
 709         while (sreader.hasNext()) {
 710             String name = sreader.nextName();
 711             FilterRepresentation filter = creatFilterFromName(name);
 712             if (filter == null) {
 713                 Log.w(LOGTAG, "UNKNOWN FILTER! " + name);
 714                 return false;
 715             }
 716             filter.deSerializeRepresentation(sreader);
 717             addFilter(filter);
 718         }
 719         sreader.endObject();
 720         return true;
 721     }
 722
 723     FilterRepresentation creatFilterFromName(String name) {
 724         if (FilterRotateRepresentation.SERIALIZATION_NAME.equals(name)) {
 725             return new FilterRotateRepresentation();
 726         } else if (FilterMirrorRepresentation.SERIALIZATION_NAME.equals(name)) {
 727             return new FilterMirrorRepresentation();
 728         } else if (FilterStraightenRepresentation.SERIALIZATION_NAME.equals(name)) {
 729             return new FilterStraightenRepresentation();
 730         } else if (FilterCropRepresentation.SERIALIZATION_NAME.equals(name)) {
 731             return new FilterCropRepresentation();
 732         }
 733         FiltersManager filtersManager = FiltersManager.getManager();
 734         return filtersManager.createFilterFromName(name);
 735     }
 736
 737     public void updateWith(ImagePreset preset) {
 738         if (preset.mFilters.size() != mFilters.size()) {
 739             Log.e(LOGTAG, "Updating a preset with an incompatible one");
 740             return;
 741         }
 742         for (int i = 0; i < mFilters.size(); i++) {
 743             FilterRepresentation destRepresentation = mFilters.elementAt(i);
 744             FilterRepresentation sourceRepresentation = preset.mFilters.elementAt(i);
 745             destRepresentation.useParametersFrom(sourceRepresentation);
 746         }
 747     }
 748 }