dali-toolkit/devel-api/text/text-utils-devel.cpp

   1 /*
   2  * Copyright (c) 2022 Samsung Electronics Co., Ltd.
   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
  18 // FILE HEADER
  19 #include <dali-toolkit/devel-api/text/text-utils-devel.h>
  20
  21 // EXTERNAL INCLUDES
  22 #include <dali/devel-api/scripting/enum-helper.h>
  23 #include <dali/devel-api/text-abstraction/font-client.h>
  24 #include <dali/devel-api/text-abstraction/text-renderer-layout-helper.h>
  25 #include <dali/devel-api/text-abstraction/text-renderer.h>
  26 #include <dali/integration-api/debug.h>
  27 #include <cstring>
  28 #include <limits>
  29
  30 // INTERNAL INCLUDES
  31 #include <dali-toolkit/internal/text/bidirectional-support.h>
  32 #include <dali-toolkit/internal/text/character-set-conversion.h>
  33 #include <dali-toolkit/internal/text/color-segmentation.h>
  34 #include <dali-toolkit/internal/text/glyph-metrics-helper.h>
  35 #include <dali-toolkit/internal/text/layouts/layout-engine.h>
  36 #include <dali-toolkit/internal/text/layouts/layout-parameters.h>
  37 #include <dali-toolkit/internal/text/markup-processor/markup-processor.h>
  38 #include <dali-toolkit/internal/text/multi-language-support.h>
  39 #include <dali-toolkit/internal/text/rendering/styles/character-spacing-helper-functions.h>
  40 #include <dali-toolkit/internal/text/segmentation.h>
  41 #include <dali-toolkit/internal/text/shaper.h>
  42 #include <dali-toolkit/internal/text/text-enumerations-impl.h>
  43 #include <dali-toolkit/internal/text/text-font-style.h>
  44 #include <dali-toolkit/internal/text/text-model.h>
  45
  46 namespace Dali
  47 {
  48 using namespace TextAbstraction;
  49
  50 namespace Toolkit
  51 {
  52 using namespace Text;
  53
  54 namespace DevelText
  55 {
  56 namespace Layout
  57 {
  58 /**
  59  * @brief The text's layout.
  60  */
  61 enum Type
  62 {
  63   SINGLELINE, ///< The text is laid out on a single line.
  64   MULTILINE,  ///< The text is laid out in multiple lines.
  65   CIRCULAR,   ///< The text is laid out on a single line following a circular path.
  66 };
  67
  68 } // namespace Layout
  69
  70 namespace CircularAlignment
  71 {
  72 /**
  73  * @brief The enumerations for the circular alignment.
  74  */
  75 enum Type
  76 {
  77   BEGIN,  ///< The text is aligned to the @p begin angle of the arc (or to the @p begin+increment if it's a RTL text).
  78   CENTER, ///< The text is centered within the arc.
  79   END,    ///< The text is aligned to the @p begin+increment angle of the arc (or to the @p begin if it's a RTL text).
  80 };
  81
  82 } // namespace CircularAlignment
  83
  84 const float TO_POINT_26_DOT_6 = 64.f;
  85 const float TO_FLOAT          = 1.f / 255.f;
  86 const float TO_UCHAR          = 255.f;
  87 const bool  RTL               = true;
  88 const float TWO_PI            = 2.f * Dali::Math::PI;    ///< 360 degrees in radians
  89 const float RAD_135           = Math::PI_2 + Math::PI_4; ///< 135 degrees in radians;
  90 const float RAD_225           = RAD_135 + Math::PI_2;    ///< 225 degrees in radians;
  91 const float RAD_270           = 3.f * Math::PI_2;        ///< 270 degrees in radians;
  92 const float RAD_315           = RAD_225 + Math::PI_2;    ///< 315 degrees in radians;
  93 const float MAX_INT           = std::numeric_limits<int>::max();
  94
  95 DALI_ENUM_TO_STRING_TABLE_BEGIN(LAYOUT_TYPE)
  96   DALI_ENUM_TO_STRING_WITH_SCOPE(DevelText::Layout, SINGLELINE)
  97   DALI_ENUM_TO_STRING_WITH_SCOPE(DevelText::Layout, MULTILINE)
  98   DALI_ENUM_TO_STRING_WITH_SCOPE(DevelText::Layout, CIRCULAR)
  99 DALI_ENUM_TO_STRING_TABLE_END(LAYOUT_TYPE)
 100
 101 DALI_ENUM_TO_STRING_TABLE_BEGIN(CIRCULAR_ALIGNMENT_TYPE)
 102   DALI_ENUM_TO_STRING_WITH_SCOPE(DevelText::CircularAlignment, BEGIN)
 103   DALI_ENUM_TO_STRING_WITH_SCOPE(DevelText::CircularAlignment, CENTER)
 104   DALI_ENUM_TO_STRING_WITH_SCOPE(DevelText::CircularAlignment, END)
 105 DALI_ENUM_TO_STRING_TABLE_END(CIRCULAR_ALIGNMENT_TYPE)
 106
 107 struct InternalDataModel
 108 {
 109   InternalDataModel(FontClient&    fontClient,
 110                     MetricsPtr     metrics,
 111                     Text::ModelPtr textModel)
 112   : fontClient(fontClient),
 113     metrics(metrics),
 114     textModel(textModel),
 115     numberOfCharacters{0u},
 116     isTextMirrored{false},
 117     numberOfGlyphs{0u}
 118   {
 119     layoutEngine.SetMetrics(metrics);
 120   }
 121
 122   FontClient&               fontClient;
 123   MetricsPtr                metrics;
 124   Text::Layout::Engine      layoutEngine; ///< The layout engine.
 125   Text::ModelPtr            textModel;    ///< Pointer to the text's model.
 126   Vector<ColorBlendingMode> blendingMode; ///< How embedded items and bitmap font glyphs are blended with color text.
 127   Vector<bool>              isEmoji;      ///< Whether the glyph is an emoji.
 128
 129   Vector<Character> mirroredUtf32Characters; // The utf32Characters Characters but mirrored if there are RTL text.
 130
 131   Length numberOfCharacters; // The number of characters (not glyphs!).
 132   bool   isTextMirrored;     // Whether the text has been mirrored.
 133
 134   Length numberOfGlyphs;
 135   Size   textLayoutArea;
 136 };
 137
 138 bool GetLayoutEnumeration(const Property::Value& propertyValue, DevelText::Layout::Type& layout)
 139 {
 140   return Scripting::GetEnumerationProperty(propertyValue, LAYOUT_TYPE_TABLE, LAYOUT_TYPE_TABLE_COUNT, layout);
 141 }
 142
 143 bool GetCircularAlignmentEnumeration(const Property::Value& propertyValue, DevelText::CircularAlignment::Type& circularAlignment)
 144 {
 145   return Scripting::GetEnumerationProperty(propertyValue, CIRCULAR_ALIGNMENT_TYPE_TABLE, CIRCULAR_ALIGNMENT_TYPE_TABLE_COUNT, circularAlignment);
 146 }
 147
 148 void ShapeTextPreprocess(const RendererParameters& textParameters, TextAbstraction::TextRenderer::Parameters& rendererParameters, InternalDataModel& internalDataModel)
 149 {
 150   MultilanguageSupport multilanguageSupport = MultilanguageSupport::Get();
 151   const uint8_t*       utf8                 = NULL; // pointer to the first character of the text (encoded in utf8)
 152   Length               textSize             = 0u;   // The length of the utf8 string.
 153
 154   Length&            numberOfCharacters      = internalDataModel.numberOfCharacters;
 155   Vector<Character>& mirroredUtf32Characters = internalDataModel.mirroredUtf32Characters;
 156   Text::ModelPtr&    textModel               = internalDataModel.textModel;
 157
 158   Vector<Character>&                     utf32Characters     = textModel->mLogicalModel->mText;                       // Characters encoded in utf32.
 159   Vector<LineBreakInfo>&                 lineBreakInfo       = textModel->mLogicalModel->mLineBreakInfo;              // The line break info.
 160   Vector<ScriptRun>&                     scripts             = textModel->mLogicalModel->mScriptRuns;                 // Charactes's script.
 161   Vector<FontDescriptionRun>&            fontDescriptionRuns = textModel->mLogicalModel->mFontDescriptionRuns;        // Desired font descriptions.
 162   Vector<FontRun>&                       validFonts          = textModel->mLogicalModel->mFontRuns;                   // Validated fonts.
 163   Vector<BidirectionalParagraphInfoRun>& bidirectionalInfo   = textModel->mLogicalModel->mBidirectionalParagraphInfo; // The bidirectional info per paragraph.
 164   Vector<CharacterDirection>&            directions          = textModel->mLogicalModel->mCharacterDirections;        // Character's directions.
 165   Vector<ColorRun>&                      colorRuns           = textModel->mLogicalModel->mColorRuns;                  // colors of the text.
 166
 167   // the default font's description.
 168   FontDescription defaultFontDescription;
 169   PointSize26Dot6 defaultPointSize = FontClient::DEFAULT_POINT_SIZE;
 170
 171   ////////////////////////////////////////////////////////////////////////////////
 172   // Process the markup string if the mark-up processor is enabled.
 173   ////////////////////////////////////////////////////////////////////////////////
 174
 175   MarkupProcessData markupProcessData(colorRuns,
 176                                       fontDescriptionRuns,
 177                                       textModel->mLogicalModel->mEmbeddedItems,
 178                                       textModel->mLogicalModel->mAnchors,
 179                                       textModel->mLogicalModel->mUnderlinedCharacterRuns,
 180                                       textModel->mLogicalModel->mBackgroundColorRuns,
 181                                       textModel->mLogicalModel->mStrikethroughCharacterRuns,
 182                                       textModel->mLogicalModel->mBoundedParagraphRuns,
 183                                       textModel->mLogicalModel->mCharacterSpacingCharacterRuns);
 184
 185   if(textParameters.markupEnabled)
 186   {
 187     ProcessMarkupString(textParameters.text, markupProcessData);
 188     textSize = markupProcessData.markupProcessedText.size();
 189
 190     // This is a bit horrible but std::string returns a (signed) char*
 191     utf8 = reinterpret_cast<const uint8_t*>(markupProcessData.markupProcessedText.c_str());
 192   }
 193   else
 194   {
 195     textSize = textParameters.text.size();
 196
 197     // This is a bit horrible but std::string returns a (signed) char*
 198     utf8 = reinterpret_cast<const uint8_t*>(textParameters.text.c_str());
 199   }
 200
 201   ////////////////////////////////////////////////////////////////////////////////
 202   // Convert from utf8 to utf32
 203   ////////////////////////////////////////////////////////////////////////////////
 204
 205   utf32Characters.Resize(textSize);
 206
 207   // Transform a text array encoded in utf8 into an array encoded in utf32.
 208   // It returns the actual number of characters.
 209   numberOfCharacters = Utf8ToUtf32(utf8, textSize, utf32Characters.Begin());
 210   utf32Characters.Resize(numberOfCharacters);
 211
 212   ////////////////////////////////////////////////////////////////////////////////
 213   // Retrieve the Line and Word Break Info.
 214   ////////////////////////////////////////////////////////////////////////////////
 215
 216   lineBreakInfo.Resize(numberOfCharacters, LINE_NO_BREAK);
 217
 218   SetLineBreakInfo(utf32Characters,
 219                    0u,
 220                    numberOfCharacters,
 221                    lineBreakInfo);
 222
 223   ////////////////////////////////////////////////////////////////////////////////
 224   // Retrieve the script runs.
 225   ////////////////////////////////////////////////////////////////////////////////
 226
 227   multilanguageSupport.SetScripts(utf32Characters,
 228                                   0u,
 229                                   numberOfCharacters,
 230                                   scripts);
 231
 232   // Check if there are emojis.
 233   // If there are an RGBA8888 pixel format is needed.
 234   for(const auto& run : scripts)
 235   {
 236     if(run.script == TextAbstraction::Script::EMOJI)
 237     {
 238       rendererParameters.pixelFormat = TextAbstraction::TextRenderer::Parameters::RGBA8888;
 239       break;
 240     }
 241   }
 242
 243   ////////////////////////////////////////////////////////////////////////////////
 244   // Retrieve the font runs.
 245   ////////////////////////////////////////////////////////////////////////////////
 246
 247   // Set the description font run with the given text parameters.
 248   FontDescriptionRun fontDescriptionRun;
 249   fontDescriptionRun.characterRun.characterIndex     = 0u;
 250   fontDescriptionRun.characterRun.numberOfCharacters = numberOfCharacters;
 251
 252   fontDescriptionRun.familyLength  = 0u;
 253   fontDescriptionRun.familyName    = nullptr;
 254   fontDescriptionRun.familyDefined = !textParameters.fontFamily.empty();
 255   if(fontDescriptionRun.familyDefined)
 256   {
 257     // The allocated memory will be freed when the logical model is destroyed.
 258     fontDescriptionRun.familyLength = textParameters.fontFamily.size();
 259     fontDescriptionRun.familyName   = new char[fontDescriptionRun.familyLength];
 260     memcpy(fontDescriptionRun.familyName, textParameters.fontFamily.c_str(), fontDescriptionRun.familyLength);
 261   }
 262
 263   fontDescriptionRun.weightDefined = !textParameters.fontWeight.empty();
 264   if(fontDescriptionRun.weightDefined)
 265   {
 266     fontDescriptionRun.weight = StringToWeight(textParameters.fontWeight.c_str());
 267   }
 268
 269   fontDescriptionRun.widthDefined = !textParameters.fontWidth.empty();
 270   if(fontDescriptionRun.widthDefined)
 271   {
 272     fontDescriptionRun.width = StringToWidth(textParameters.fontWidth.c_str());
 273   }
 274
 275   fontDescriptionRun.slantDefined = !textParameters.fontSlant.empty();
 276   if(fontDescriptionRun.slantDefined)
 277   {
 278     fontDescriptionRun.slant = StringToSlant(textParameters.fontSlant.c_str());
 279   }
 280
 281   fontDescriptionRun.sizeDefined = !EqualsZero(textParameters.fontSize);
 282   if(fontDescriptionRun.sizeDefined)
 283   {
 284     fontDescriptionRun.size = static_cast<unsigned int>(textParameters.fontSize * TO_POINT_26_DOT_6);
 285   }
 286
 287   fontDescriptionRuns.PushBack(fontDescriptionRun);
 288
 289   // Validates the fonts. If there is a character with no assigned font it sets a default one.
 290   // After this call, fonts are validated.
 291   multilanguageSupport.ValidateFonts(utf32Characters,
 292                                      scripts,
 293                                      fontDescriptionRuns,
 294                                      defaultFontDescription,
 295                                      defaultPointSize,
 296                                      1.0f,
 297                                      0u,
 298                                      numberOfCharacters,
 299                                      validFonts);
 300
 301   ////////////////////////////////////////////////////////////////////////////////
 302   // Retrieve the Bidirectional info.
 303   ////////////////////////////////////////////////////////////////////////////////
 304
 305   bidirectionalInfo.Reserve(1u);
 306
 307   SetBidirectionalInfo(utf32Characters,
 308                        scripts,
 309                        lineBreakInfo,
 310                        0u,
 311                        numberOfCharacters,
 312                        bidirectionalInfo);
 313
 314   const bool hasBidirectionalText = 0u != bidirectionalInfo.Count();
 315   if(hasBidirectionalText)
 316   {
 317     // Only set the character directions if there is right to left characters.
 318     GetCharactersDirection(bidirectionalInfo,
 319                            numberOfCharacters,
 320                            0u,
 321                            numberOfCharacters,
 322                            directions);
 323
 324     // This paragraph has right to left text. Some characters may need to be mirrored.
 325     // TODO: consider if the mirrored string can be stored as well.
 326
 327     internalDataModel.isTextMirrored = GetMirroredText(utf32Characters,
 328                                                        directions,
 329                                                        bidirectionalInfo,
 330                                                        0u,
 331                                                        numberOfCharacters,
 332                                                        mirroredUtf32Characters);
 333   }
 334 }
 335
 336 void ShapeText(TextAbstraction::TextRenderer::Parameters& rendererParameters, Vector<EmbeddedItemInfo>& embeddedItemLayout, InternalDataModel& internalDataModel)
 337 {
 338   Vector<GlyphIndex>           newParagraphGlyphs; // Glyphs for the new paragraph characters.
 339   const Length                 numberOfCharacters      = internalDataModel.numberOfCharacters;
 340   const bool                   isTextMirrored          = internalDataModel.isTextMirrored;
 341   Text::ModelPtr&              textModel               = internalDataModel.textModel;
 342   const Vector<Character>&     mirroredUtf32Characters = internalDataModel.mirroredUtf32Characters;
 343   FontClient&                  fontClient              = internalDataModel.fontClient;
 344   const Vector<Character>&     utf32Characters         = textModel->mLogicalModel->mText;          // Characters encoded in utf32.
 345   const Vector<LineBreakInfo>& lineBreakInfo           = textModel->mLogicalModel->mLineBreakInfo; // The line break info.
 346   const Vector<ScriptRun>&     scripts                 = textModel->mLogicalModel->mScriptRuns;    // Charactes's script.
 347   const Vector<FontRun>&       validFonts              = textModel->mLogicalModel->mFontRuns;      // Validated fonts.
 348
 349   Vector<CharacterIndex>& glyphsToCharacters = textModel->mVisualModel->mGlyphsToCharacters; // Glyphs to character map.
 350   Vector<Length>&         charactersPerGlyph = textModel->mVisualModel->mCharactersPerGlyph; // Number of characters per glyph.
 351
 352   ////////////////////////////////////////////////////////////////////////////////
 353   // Retrieve the glyphs. Text shaping
 354   ////////////////////////////////////////////////////////////////////////////////
 355
 356   const Vector<Character>& textToShape = isTextMirrored ? mirroredUtf32Characters : utf32Characters;
 357
 358   newParagraphGlyphs.Reserve(1u);
 359
 360   // Shapes the text.
 361   ShapeText(textToShape,
 362             lineBreakInfo,
 363             scripts,
 364             validFonts,
 365             0u,
 366             0u,
 367             numberOfCharacters,
 368             rendererParameters.glyphs,
 369             glyphsToCharacters,
 370             charactersPerGlyph,
 371             newParagraphGlyphs);
 372
 373   // Create the 'number of glyphs' per character and the glyph to character conversion tables.
 374   textModel->mVisualModel->CreateGlyphsPerCharacterTable(0u, 0u, numberOfCharacters);
 375   textModel->mVisualModel->CreateCharacterToGlyphTable(0u, 0u, numberOfCharacters);
 376
 377   internalDataModel.numberOfGlyphs = rendererParameters.glyphs.Count();
 378
 379   // Once the text has been shaped and the glyphs created it's possible to replace the font id of those glyphs
 380   // that represent an image or an item and create the embedded item layout info.
 381   // Note: the position of the embedded item can't be set until the text is laid-out.
 382   embeddedItemLayout.Reserve(textModel->mLogicalModel->mEmbeddedItems.Count());
 383   for(const auto& item : textModel->mLogicalModel->mEmbeddedItems)
 384   {
 385     // Get the glyph that matches with the character index.
 386     const GlyphIndex glyphIndex = textModel->mVisualModel->mCharactersToGlyph[item.characterIndex];
 387     GlyphInfo&       glyph      = rendererParameters.glyphs[glyphIndex];
 388
 389     glyph.fontId                                                     = 0u;
 390     Pixel::Format                                        pixelFormat = Pixel::A8;
 391     TextAbstraction::FontClient::EmbeddedItemDescription description = {std::string(item.url, item.urlLength), item.width, item.height, item.colorBlendingMode};
 392     glyph.index                                                      = fontClient.CreateEmbeddedItem(description, pixelFormat); // Set here an index to an item.
 393
 394     if((Pixel::RGBA8888 == pixelFormat) || (Pixel::BGRA8888 == pixelFormat))
 395     {
 396       rendererParameters.pixelFormat = TextAbstraction::TextRenderer::Parameters::RGBA8888;
 397     }
 398
 399     // If the url is empty the item is going to be added after the text is rendered. It's needed to store the layout here.
 400     if(description.url.empty())
 401     {
 402       EmbeddedItemInfo embeddedInfo =
 403         {
 404           item.characterIndex,
 405           glyphIndex,
 406           Vector2::ZERO,
 407           Size(static_cast<float>(item.width), static_cast<float>(item.height)),
 408           Size(static_cast<float>(item.width), static_cast<float>(item.height)),
 409           Degree(0.f),
 410           item.colorBlendingMode};
 411
 412       embeddedItemLayout.PushBack(embeddedInfo);
 413     }
 414   }
 415 }
 416
 417 void SetColorSegmentation(const RendererParameters& textParameters, InternalDataModel& internalDataModel)
 418 {
 419   Text::ModelPtr&            textModel    = internalDataModel.textModel;
 420   Vector<ColorBlendingMode>& blendingMode = internalDataModel.blendingMode;
 421
 422   Vector<ColorRun>& colorRuns = textModel->mLogicalModel->mColorRuns; // colors of the text.
 423
 424   Vector<GlyphIndex>& charactersToGlyph  = textModel->mVisualModel->mCharactersToGlyph;  // Characters to glyphs map.
 425   Vector<Length>&     glyphsPerCharacter = textModel->mVisualModel->mGlyphsPerCharacter; // The number of glyphs that are shaped.
 426
 427   ////////////////////////////////////////////////////////////////////////////////
 428   // Set the color runs in glyphs.
 429   ////////////////////////////////////////////////////////////////////////////////
 430
 431   SetColorSegmentationInfo(colorRuns,
 432                            charactersToGlyph,
 433                            glyphsPerCharacter,
 434                            0u,
 435                            0u,
 436                            internalDataModel.numberOfCharacters,
 437                            textModel->mVisualModel->mColors,
 438                            textModel->mVisualModel->mColorIndices);
 439
 440   // Insert the default color at the beginning of the vector.
 441   textModel->mVisualModel->mColors.Insert(textModel->mVisualModel->mColors.Begin(), textParameters.textColor);
 442
 443   // Set how the embedded items are blended with text color.
 444   blendingMode.Resize(internalDataModel.numberOfGlyphs, textParameters.isTextColorSet ? ColorBlendingMode::MULTIPLY : ColorBlendingMode::NONE);
 445
 446   if(!textParameters.isTextColorSet)
 447   {
 448     // Traverse the color runs.
 449     for(const auto& run : colorRuns)
 450     {
 451       const GlyphIndex     firstGlyph       = textModel->mVisualModel->mCharactersToGlyph[run.characterRun.characterIndex];
 452       const CharacterIndex lastCharacter    = run.characterRun.characterIndex + run.characterRun.numberOfCharacters - 1u;
 453       const GlyphIndex     lastGlyphPlusOne = textModel->mVisualModel->mCharactersToGlyph[lastCharacter] + textModel->mVisualModel->mGlyphsPerCharacter[lastCharacter];
 454
 455       for(GlyphIndex index = firstGlyph; index < lastGlyphPlusOne; ++index)
 456       {
 457         blendingMode[index] = ColorBlendingMode::MULTIPLY;
 458       }
 459     }
 460   }
 461
 462   // Traverse the embedded items and update the blending mode vector.
 463   for(const auto& item : textModel->mLogicalModel->mEmbeddedItems)
 464   {
 465     const GlyphIndex glyphIndex = textModel->mVisualModel->mCharactersToGlyph[item.characterIndex];
 466     blendingMode[glyphIndex]    = item.colorBlendingMode;
 467   }
 468 }
 469
 470 void SetEmojiVector(InternalDataModel& internalDataModel)
 471 {
 472   Vector<bool>&   isEmoji        = internalDataModel.isEmoji;
 473   Text::ModelPtr& textModel      = internalDataModel.textModel;
 474   const Length    numberOfGlyphs = internalDataModel.numberOfGlyphs;
 475
 476   const Vector<ScriptRun>& scripts = textModel->mLogicalModel->mScriptRuns; // Charactes's script.
 477   ////////////////////////////////////////////////////////////////////////////////
 478   // Set the isEmoji Vector
 479   ////////////////////////////////////////////////////////////////////////////////
 480
 481   isEmoji.Resize(numberOfGlyphs, false);
 482
 483   for(const auto& run : scripts)
 484   {
 485     if(run.script == TextAbstraction::Script::EMOJI)
 486     {
 487       const GlyphIndex     firstGlyph       = textModel->mVisualModel->mCharactersToGlyph[run.characterRun.characterIndex];
 488       const CharacterIndex lastCharacter    = run.characterRun.characterIndex + run.characterRun.numberOfCharacters - 1u;
 489       const GlyphIndex     lastGlyphPlusOne = textModel->mVisualModel->mCharactersToGlyph[lastCharacter] + textModel->mVisualModel->mGlyphsPerCharacter[lastCharacter];
 490
 491       for(GlyphIndex index = firstGlyph; index < lastGlyphPlusOne; ++index)
 492       {
 493         isEmoji[index] = true;
 494       }
 495     }
 496   }
 497 }
 498
 499 void Align(const RendererParameters& textParameters, TextAbstraction::TextRenderer::Parameters& rendererParameters, Vector<EmbeddedItemInfo>& embeddedItemLayout, InternalDataModel& internalDataModel, const Size& newLayoutSize)
 500 {
 501   Text::Layout::Engine& layoutEngine       = internalDataModel.layoutEngine;
 502   Text::ModelPtr&       textModel          = internalDataModel.textModel;
 503   const Length          numberOfCharacters = internalDataModel.numberOfCharacters;
 504   Size&                 textLayoutArea     = internalDataModel.textLayoutArea;
 505
 506   Vector<LineRun>& lines = textModel->mVisualModel->mLines; // The laid out lines.
 507
 508   ////////////////////////////////////////////////////////////////////////////////
 509   // Align the text.
 510   ////////////////////////////////////////////////////////////////////////////////
 511
 512   HorizontalAlignment::Type horizontalAlignment         = Toolkit::HorizontalAlignment::CENTER;
 513   HorizontalAlignment::Type horizontalCircularAlignment = Toolkit::HorizontalAlignment::CENTER;
 514   VerticalAlignment::Type   verticalAlignment           = VerticalAlignment::CENTER;
 515   CircularAlignment::Type   circularAlignment           = CircularAlignment::BEGIN;
 516
 517   Layout::Type layout = Layout::SINGLELINE;
 518
 519   // Sets the alignment
 520   Property::Value horizontalAlignmentStr(textParameters.horizontalAlignment);
 521   GetHorizontalAlignmentEnumeration(horizontalAlignmentStr, horizontalAlignment);
 522   horizontalCircularAlignment = horizontalAlignment;
 523
 524   Property::Value verticalAlignmentStr(textParameters.verticalAlignment);
 525   GetVerticalAlignmentEnumeration(verticalAlignmentStr, verticalAlignment);
 526
 527   Property::Value circularAlignmentStr(textParameters.circularAlignment);
 528   GetCircularAlignmentEnumeration(circularAlignmentStr, circularAlignment);
 529
 530   Property::Value layoutStr(textParameters.layout);
 531   GetLayoutEnumeration(layoutStr, layout);
 532
 533   // Whether the layout is circular.
 534   const bool isCircularTextLayout = (Layout::CIRCULAR == layout);
 535   const bool isClockwise          = isCircularTextLayout && (0.f < textParameters.incrementAngle);
 536
 537   // Convert CircularAlignment to HorizontalAlignment.
 538   if(isCircularTextLayout)
 539   {
 540     switch(circularAlignment)
 541     {
 542       case CircularAlignment::BEGIN:
 543       {
 544         horizontalCircularAlignment = Toolkit::HorizontalAlignment::BEGIN;
 545         break;
 546       }
 547       case CircularAlignment::CENTER:
 548       {
 549         horizontalCircularAlignment = Toolkit::HorizontalAlignment::CENTER;
 550         break;
 551       }
 552       case CircularAlignment::END:
 553       {
 554         horizontalCircularAlignment = Toolkit::HorizontalAlignment::END;
 555         break;
 556       }
 557     }
 558   }
 559   textModel->mHorizontalAlignment = isCircularTextLayout ? horizontalCircularAlignment : horizontalAlignment;
 560
 561   // Retrieve the line of text to know the direction and the width. @todo multi-line
 562   const LineRun& line = lines[0u];
 563
 564   if(isCircularTextLayout)
 565   {
 566     // Set the circular alignment.
 567     rendererParameters.circularLayout = isClockwise ? TextRenderer::Parameters::CLOCKWISE : TextRenderer::Parameters::COUNTER_CLOCKWISE;
 568
 569     // Update the text's height to be used by the ellipsis code.
 570     textLayoutArea.height = newLayoutSize.height;
 571
 572     // Set the size of the text laid out on a straight horizontal line.
 573     rendererParameters.circularWidth  = static_cast<unsigned int>(newLayoutSize.width);
 574     rendererParameters.circularHeight = static_cast<unsigned int>(newLayoutSize.height);
 575
 576     // Calculate the center of the circular text according the horizontal and vertical alingments and the radius.
 577     switch(horizontalAlignment)
 578     {
 579       case HorizontalAlignment::BEGIN:
 580       {
 581         rendererParameters.centerX = static_cast<int>(textParameters.radius);
 582         break;
 583       }
 584       case HorizontalAlignment::CENTER:
 585       {
 586         rendererParameters.centerX = static_cast<int>(textParameters.textWidth / 2u);
 587         break;
 588       }
 589       case HorizontalAlignment::END:
 590       {
 591         rendererParameters.centerX = static_cast<int>(textParameters.textWidth) - static_cast<int>(textParameters.radius);
 592         break;
 593       }
 594     }
 595
 596     switch(verticalAlignment)
 597     {
 598       case VerticalAlignment::TOP:
 599       {
 600         rendererParameters.centerY = static_cast<int>(textParameters.radius);
 601         break;
 602       }
 603       case VerticalAlignment::CENTER:
 604       {
 605         rendererParameters.centerY = static_cast<int>(textParameters.textHeight / 2u);
 606         break;
 607       }
 608       case VerticalAlignment::BOTTOM:
 609       {
 610         rendererParameters.centerY = static_cast<int>(textParameters.textHeight) - static_cast<int>(textParameters.radius);
 611         break;
 612       }
 613     }
 614
 615     // Calculate the beginning angle according with the given horizontal alignment.
 616     const bool isRTL = RTL == line.direction;
 617
 618     CircularAlignment::Type alignment = circularAlignment;
 619     if(isRTL)
 620     {
 621       // Swap the alignment type if the line is right to left.
 622       switch(alignment)
 623       {
 624         case CircularAlignment::BEGIN:
 625         {
 626           alignment = CircularAlignment::END;
 627           break;
 628         }
 629         case CircularAlignment::CENTER:
 630         {
 631           // Nothing to do.
 632           break;
 633         }
 634         case CircularAlignment::END:
 635         {
 636           alignment = CircularAlignment::BEGIN;
 637           break;
 638         }
 639       }
 640     }
 641
 642     float angleOffset = 0.f;
 643
 644     switch(alignment)
 645     {
 646       case CircularAlignment::BEGIN:
 647       {
 648         angleOffset = 0.f;
 649         break;
 650       }
 651       case CircularAlignment::CENTER:
 652       {
 653         const bool  isNeg     = textParameters.incrementAngle < 0.f;
 654         const float textWidth = static_cast<float>(rendererParameters.circularWidth);
 655         angleOffset           = (isNeg ? -0.5f : 0.5f) * (textLayoutArea.width - textWidth) / static_cast<float>(rendererParameters.radius);
 656         break;
 657       }
 658       case CircularAlignment::END:
 659       {
 660         const bool  isNeg     = textParameters.incrementAngle < 0.f;
 661         const float textWidth = static_cast<float>(rendererParameters.circularWidth);
 662         angleOffset           = (isNeg ? -1.f : 1.f) * (textLayoutArea.width - textWidth) / static_cast<float>(rendererParameters.radius);
 663         break;
 664       }
 665     }
 666
 667     // Update the beginning angle with the calculated offset.
 668     rendererParameters.beginAngle = Radian(Degree(textParameters.beginAngle)) + angleOffset;
 669
 670     // Set the vertical position of the glyphs.
 671     for(auto& position : rendererParameters.positions)
 672     {
 673       position.y = 0.f;
 674     }
 675   }
 676   else
 677   {
 678     // Calculate the vertical offset according with the given alignment.
 679     float penY = 0.f;
 680
 681     switch(verticalAlignment)
 682     {
 683       case VerticalAlignment::TOP:
 684       {
 685         penY = line.ascender;
 686         break;
 687       }
 688       case VerticalAlignment::CENTER:
 689       {
 690         penY = line.ascender + 0.5f * (textLayoutArea.height - (line.ascender - line.descender));
 691         break;
 692       }
 693       case VerticalAlignment::BOTTOM:
 694       {
 695         penY = textLayoutArea.height;
 696         break;
 697       }
 698     }
 699
 700     // Calculate the horizontal offset according with the given alignment.
 701     float alignmentOffset = 0.f;
 702     layoutEngine.Align(textLayoutArea,
 703                        0u,
 704                        numberOfCharacters,
 705                        horizontalAlignment,
 706                        lines,
 707                        alignmentOffset,
 708                        Dali::LayoutDirection::LEFT_TO_RIGHT,
 709                        false);
 710
 711     // Update the position of the glyphs with the calculated offsets.
 712     for(auto& position : rendererParameters.positions)
 713     {
 714       position.x += line.alignmentOffset;
 715       position.y = penY;
 716     }
 717   }
 718
 719   // Cairo adds the bearing to the position of the glyph
 720   // that has already been added by the DALi's layout engine,
 721   // so it's needed to be removed here.
 722   for(unsigned int index = 0u; index < rendererParameters.glyphs.Count(); ++index)
 723   {
 724     const GlyphInfo& glyph    = rendererParameters.glyphs[index];
 725     Vector2&         position = rendererParameters.positions[index];
 726
 727     position.x -= glyph.xBearing;
 728   }
 729
 730   // Set the position of the embedded items (if there is any).
 731   EmbeddedItemInfo* embeddedItemLayoutBuffer = embeddedItemLayout.Begin();
 732
 733   for(Length index = 0u, endIndex = embeddedItemLayout.Count(); index < endIndex; ++index)
 734   {
 735     EmbeddedItemInfo& embeddedItem = *(embeddedItemLayoutBuffer + index);
 736
 737     embeddedItem.position = rendererParameters.positions[embeddedItem.glyphIndex];
 738
 739     if(isCircularTextLayout)
 740     {
 741       // Calculate the new position of the embedded item in the circular path.
 742
 743       // Center of the bitmap.
 744       const float halfWidth  = 0.5f * embeddedItem.size.width;
 745       const float halfHeight = 0.5f * embeddedItem.size.height;
 746       double      centerX    = static_cast<double>(embeddedItem.position.x + halfWidth);
 747       double      centerY    = static_cast<double>(embeddedItem.position.y - halfHeight);
 748
 749       Dali::TextAbstraction::CircularTextParameters circularTextParameters;
 750
 751       circularTextParameters.radius     = static_cast<double>(rendererParameters.radius);
 752       circularTextParameters.invRadius  = 1.0 / circularTextParameters.radius;
 753       circularTextParameters.beginAngle = static_cast<double>(-rendererParameters.beginAngle + Dali::Math::PI_2);
 754       circularTextParameters.centerX    = 0.5f * static_cast<double>(textParameters.textWidth);
 755       circularTextParameters.centerY    = 0.5f * static_cast<double>(textParameters.textHeight);
 756
 757       // Calculate the rotation angle.
 758       float radians = rendererParameters.beginAngle;
 759       if(isClockwise)
 760       {
 761         radians += static_cast<float>(circularTextParameters.invRadius * centerX);
 762         radians = -radians;
 763       }
 764       else
 765       {
 766         radians -= static_cast<float>(circularTextParameters.invRadius * centerX);
 767         radians = -radians + Dali::Math::PI;
 768       }
 769       embeddedItem.angle = Degree(Radian(radians));
 770
 771       Dali::TextAbstraction::TransformToArc(circularTextParameters, centerX, centerY);
 772
 773       // Recalculate the size of the embedded item after the rotation to position it correctly.
 774       float width  = embeddedItem.size.width;
 775       float height = embeddedItem.size.height;
 776
 777       // Transform the input angle into the range [0..2PI]
 778       radians = fmod(radians, TWO_PI);
 779       radians += (radians < 0.f) ? TWO_PI : 0.f;
 780
 781       // Does the same operations than rotate by shear.
 782       if((radians > Math::PI_4) && (radians <= RAD_135))
 783       {
 784         std::swap(width, height);
 785         radians -= Math::PI_2;
 786       }
 787       else if((radians > RAD_135) && (radians <= RAD_225))
 788       {
 789         radians -= Math::PI;
 790       }
 791       else if((radians > RAD_225) && (radians <= RAD_315))
 792       {
 793         std::swap(width, height);
 794         radians -= RAD_270;
 795       }
 796
 797       if(fabs(radians) > Dali::Math::MACHINE_EPSILON_10)
 798       {
 799         const float angleSinus   = fabs(sin(radians));
 800         const float angleCosinus = cos(radians);
 801
 802         // Calculate the rotated image dimensions.
 803         embeddedItem.rotatedSize.height = width * angleSinus + height * angleCosinus;
 804         embeddedItem.rotatedSize.width  = height * angleSinus + width * angleCosinus + 1.f;
 805       }
 806
 807       embeddedItem.position.x = floor(static_cast<float>(centerX) - 0.5f * embeddedItem.rotatedSize.width);
 808       embeddedItem.position.y = floor(static_cast<float>(centerY) - 0.5f * embeddedItem.rotatedSize.height);
 809     }
 810     else
 811     {
 812       embeddedItem.position.y -= embeddedItem.size.height;
 813     }
 814   }
 815 }
 816
 817 void Ellipsis(const RendererParameters& textParameters, TextAbstraction::TextRenderer::Parameters& rendererParameters, Vector<EmbeddedItemInfo>& embeddedItemLayout, InternalDataModel& internalDataModel)
 818 {
 819   Text::ModelPtr& textModel  = internalDataModel.textModel;
 820   FontClient&     fontClient = internalDataModel.fontClient;
 821
 822   Vector<LineRun>&        lines                     = textModel->mVisualModel->mLines; // The laid out lines.
 823   Vector<bool>&           isEmoji                   = internalDataModel.isEmoji;
 824   const Size              textLayoutArea            = internalDataModel.textLayoutArea;
 825   const float             modelCharacterSpacing     = textModel->mVisualModel->GetCharacterSpacing();
 826   float                   calculatedAdvance         = 0.f;
 827   Vector<CharacterIndex>& glyphToCharacterMap       = textModel->mVisualModel->mGlyphsToCharacters;
 828   const CharacterIndex*   glyphToCharacterMapBuffer = glyphToCharacterMap.Begin();
 829
 830   // Get the character-spacing runs.
 831   const Vector<CharacterSpacingGlyphRun>& characterSpacingGlyphRuns = textModel->mVisualModel->GetCharacterSpacingGlyphRuns();
 832
 833   ////////////////////////////////////////////////////////////////////////////////
 834   // Ellipsis the text.
 835   ////////////////////////////////////////////////////////////////////////////////
 836
 837   if(textParameters.ellipsisEnabled)
 838   {
 839     const LineRun& line = lines[0u]; // TODO: multi-line
 840
 841     if(line.ellipsis)
 842     {
 843       Length finalNumberOfGlyphs = 0u;
 844
 845       if((GetLineHeight(line, (lines.Size() == 1))) > textLayoutArea.height)
 846       {
 847         // The height of the line is bigger than the height of the text area.
 848         // Show the ellipsis glyph even if it doesn't fit in the text area.
 849         // If no text is rendered then issues are rised and it may be a while
 850         // until is find out that the text area is too small.
 851
 852         // Get the first glyph which is going to be replaced and the ellipsis glyph.
 853         GlyphInfo&       glyphInfo     = rendererParameters.glyphs[0u];
 854         const GlyphInfo& ellipsisGlyph = fontClient.GetEllipsisGlyph(fontClient.GetPointSize(glyphInfo.fontId));
 855
 856         // Change the 'x' and 'y' position of the ellipsis glyph.
 857         Vector2& position = rendererParameters.positions[0u];
 858         position.x        = ellipsisGlyph.xBearing;
 859         position.y        = textLayoutArea.height - ellipsisGlyph.yBearing;
 860
 861         // Replace the glyph by the ellipsis glyph.
 862         glyphInfo = ellipsisGlyph;
 863
 864         // Set the final number of glyphs
 865         finalNumberOfGlyphs = 1u;
 866       }
 867       else
 868       {
 869         // firstPenX, penY and firstPenSet are used to position the ellipsis glyph if needed.
 870         float firstPenX   = 0.f; // Used if rtl text is elided.
 871         bool  firstPenSet = false;
 872
 873         // Add the ellipsis glyph.
 874         bool   inserted              = false;
 875         float  removedGlypsWidth     = 0.f;
 876         Length numberOfRemovedGlyphs = 0u;
 877         if(line.glyphRun.numberOfGlyphs > 0u)
 878         {
 879           GlyphIndex index = line.glyphRun.numberOfGlyphs - 1u;
 880
 881           GlyphInfo* glyphs         = rendererParameters.glyphs.Begin();
 882           Vector2*   glyphPositions = rendererParameters.positions.Begin();
 883
 884           float penY = 0.f;
 885
 886           // The ellipsis glyph has to fit in the place where the last glyph(s) is(are) removed.
 887           while(!inserted)
 888           {
 889             const GlyphInfo& glyphToRemove = *(glyphs + index);
 890
 891             if(0u != glyphToRemove.fontId)
 892             {
 893               // i.e. The font id of the glyph shaped from the '\n' character is zero.
 894
 895               // Need to reshape the glyph as the font may be different in size.
 896               const GlyphInfo& ellipsisGlyph = fontClient.GetEllipsisGlyph(fontClient.GetPointSize(glyphToRemove.fontId));
 897
 898               if(!firstPenSet)
 899               {
 900                 const Vector2& position = *(glyphPositions + index);
 901
 902                 // Calculates the penY of the current line. It will be used to position the ellipsis glyph.
 903                 penY = position.y;
 904
 905                 // Calculates the first penX which will be used if rtl text is elided.
 906                 firstPenX = position.x - glyphToRemove.xBearing;
 907                 if(firstPenX < -ellipsisGlyph.xBearing)
 908                 {
 909                   // Avoids to exceed the bounding box when rtl text is elided.
 910                   firstPenX = -ellipsisGlyph.xBearing;
 911                 }
 912
 913                 removedGlypsWidth = -ellipsisGlyph.xBearing;
 914
 915                 firstPenSet = true;
 916               }
 917
 918               const float characterSpacing = GetGlyphCharacterSpacing(index, characterSpacingGlyphRuns, modelCharacterSpacing);
 919               calculatedAdvance            = GetCalculatedAdvance(*(textModel->mLogicalModel->mText.Begin() + (*(glyphToCharacterMapBuffer + index))), characterSpacing, glyphToRemove.advance);
 920               removedGlypsWidth += std::min(calculatedAdvance, (glyphToRemove.xBearing + glyphToRemove.width));
 921
 922               // Calculate the width of the ellipsis glyph and check if it fits.
 923               const float ellipsisGlyphWidth = ellipsisGlyph.width + ellipsisGlyph.xBearing;
 924               if(ellipsisGlyphWidth < removedGlypsWidth)
 925               {
 926                 GlyphInfo& glyphInfo = *(glyphs + index);
 927                 Vector2&   position  = *(glyphPositions + index);
 928                 position.x -= (0.f > glyphInfo.xBearing) ? glyphInfo.xBearing : 0.f;
 929
 930                 // Replace the glyph by the ellipsis glyph.
 931                 glyphInfo = ellipsisGlyph;
 932
 933                 // Update the isEmoji vector
 934                 isEmoji[index] = false;
 935
 936                 // Change the 'x' and 'y' position of the ellipsis glyph.
 937
 938                 if(position.x > firstPenX)
 939                 {
 940                   position.x = firstPenX + removedGlypsWidth - ellipsisGlyphWidth;
 941                 }
 942
 943                 position.x += ellipsisGlyph.xBearing;
 944                 position.y = penY;
 945
 946                 inserted = true;
 947               }
 948             }
 949
 950             if(!inserted)
 951             {
 952               if(index > 0u)
 953               {
 954                 --index;
 955               }
 956               else
 957               {
 958                 // No space for the ellipsis.
 959                 inserted = true;
 960               }
 961               ++numberOfRemovedGlyphs;
 962             }
 963
 964             // Set the final number of glyphs
 965             finalNumberOfGlyphs = line.glyphRun.numberOfGlyphs - numberOfRemovedGlyphs;
 966           }
 967         }
 968
 969         // Resize the number of glyphs/positions
 970         rendererParameters.glyphs.Resize(finalNumberOfGlyphs);
 971         rendererParameters.positions.Resize(finalNumberOfGlyphs);
 972
 973         // Remove from the embedded items those exceding the last laid out glyph.
 974         embeddedItemLayout.Erase(std::remove_if(embeddedItemLayout.Begin(),
 975                                                 embeddedItemLayout.End(),
 976                                                 [finalNumberOfGlyphs](const EmbeddedItemInfo& item) {
 977                                                   return item.glyphIndex >= finalNumberOfGlyphs;
 978                                                 }),
 979                                  embeddedItemLayout.End());
 980       }
 981     }
 982   }
 983 }
 984
 985 Size LayoutText(const RendererParameters& textParameters, TextAbstraction::TextRenderer::Parameters& rendererParameters, Vector<EmbeddedItemInfo>& embeddedItemLayout, InternalDataModel& internalDataModel)
 986 {
 987   ////////////////////////////////////////////////////////////////////////////////
 988   // Layout the text.
 989   ////////////////////////////////////////////////////////////////////////////////
 990   Text::ModelPtr&          textModel               = internalDataModel.textModel;
 991   Text::Layout::Engine&    layoutEngine            = internalDataModel.layoutEngine;
 992   FontClient&              fontClient              = internalDataModel.fontClient;
 993   const Length             numberOfGlyphs          = internalDataModel.numberOfGlyphs;
 994   const bool               isTextMirrored          = internalDataModel.isTextMirrored;
 995   const Vector<Character>& mirroredUtf32Characters = internalDataModel.mirroredUtf32Characters;
 996   const Length             numberOfCharacters      = internalDataModel.numberOfCharacters;
 997   const auto               ellipsisPosition        = textModel->mEllipsisPosition;
 998
 999   Layout::Type layout = Layout::SINGLELINE;
1000
1001   Property::Value layoutStr(textParameters.layout);
1002   GetLayoutEnumeration(layoutStr, layout);
1003
1004   // Whether the layout is multi-line.
1005   const Text::Layout::Engine::Type horizontalLayout = (Layout::MULTILINE == layout) ? Text::Layout::Engine::MULTI_LINE_BOX : Text::Layout::Engine::SINGLE_LINE_BOX;
1006   layoutEngine.SetLayout(horizontalLayout); // TODO: multi-line.
1007
1008   // Set minimun line size
1009   layoutEngine.SetDefaultLineSize(textParameters.minLineSize);
1010
1011   // Whether the layout is circular.
1012   const bool isCircularTextLayout = (Layout::CIRCULAR == layout);
1013   const bool isClockwise          = isCircularTextLayout && (0.f < textParameters.incrementAngle);
1014
1015   // Calculates the max ascender or the max descender.
1016   // Is used to calculate the radius of the base line of the text.
1017   float maxAscenderDescender = 0.f;
1018   if(isCircularTextLayout)
1019   {
1020     FontId currentFontId = 0u;
1021     for(const auto& glyph : rendererParameters.glyphs)
1022     {
1023       if(currentFontId != glyph.fontId)
1024       {
1025         currentFontId = glyph.fontId;
1026         FontMetrics metrics;
1027         fontClient.GetFontMetrics(currentFontId, metrics);
1028         maxAscenderDescender = std::max(maxAscenderDescender, isClockwise ? metrics.ascender : metrics.descender);
1029       }
1030     }
1031   }
1032   const unsigned int radius = textParameters.radius - static_cast<unsigned int>(maxAscenderDescender);
1033
1034   // Set the layout parameters.
1035   Size textLayoutArea = Size(static_cast<float>(textParameters.textWidth),
1036                              static_cast<float>(textParameters.textHeight));
1037
1038   // padding
1039   Extents padding                  = textParameters.padding;
1040   internalDataModel.textLayoutArea = Size(textLayoutArea.x - (padding.start + padding.end), textLayoutArea.y - (padding.top + padding.bottom));
1041
1042   if(isCircularTextLayout)
1043   {
1044     // In a circular layout, the length of the text area depends on the radius.
1045     rendererParameters.radius              = radius;
1046     internalDataModel.textLayoutArea.width = fabs(Radian(Degree(textParameters.incrementAngle)) * static_cast<float>(rendererParameters.radius));
1047   }
1048   // Resize the vector of positions to have the same size than the vector of glyphs.
1049   rendererParameters.positions.Resize(numberOfGlyphs);
1050
1051   textModel->mLineWrapMode          = Text::LineWrap::WORD;
1052   textModel->mIgnoreSpacesAfterText = false;
1053   Text::Layout::Parameters layoutParameters(internalDataModel.textLayoutArea,
1054                                             textModel);
1055
1056   // Whether the last character is a new paragraph character.
1057   const Vector<Character>& textToShape = isTextMirrored ? mirroredUtf32Characters : textModel->mLogicalModel->mText;
1058   layoutParameters.isLastNewParagraph  = TextAbstraction::IsNewParagraph(textToShape[numberOfCharacters - 1u]);
1059
1060   // The initial glyph and the number of glyphs to layout.
1061   layoutParameters.startGlyphIndex        = 0u;
1062   layoutParameters.numberOfGlyphs         = numberOfGlyphs;
1063   layoutParameters.startLineIndex         = 0u;
1064   layoutParameters.estimatedNumberOfLines = 1u;
1065   layoutParameters.interGlyphExtraAdvance = 0.f;
1066
1067   // Update the visual model.
1068   Size newLayoutSize;
1069   bool isAutoScrollEnabled            = false;
1070   bool isAutoScrollMaxTextureExceeded = false;
1071   bool isHiddenInputEnabled           = false;
1072
1073   layoutEngine.LayoutText(layoutParameters,
1074                           newLayoutSize,
1075                           textParameters.ellipsisEnabled,
1076                           isAutoScrollEnabled,
1077                           isAutoScrollMaxTextureExceeded,
1078                           isHiddenInputEnabled,
1079                           ellipsisPosition);
1080
1081   return newLayoutSize;
1082 }
1083
1084 Devel::PixelBuffer RenderText(const RendererParameters& textParameters, TextAbstraction::TextRenderer::Parameters& rendererParameters)
1085 {
1086   ////////////////////////////////////////////////////////////////////////////////
1087   // Render the text.
1088   ////////////////////////////////////////////////////////////////////////////////
1089
1090   rendererParameters.width  = textParameters.textWidth;
1091   rendererParameters.height = textParameters.textHeight;
1092
1093   TextAbstraction::TextRenderer renderer = TextAbstraction::TextRenderer::Get();
1094   return renderer.Render(rendererParameters);
1095 }
1096
1097 Devel::PixelBuffer Render(const RendererParameters& textParameters, Vector<EmbeddedItemInfo>& embeddedItemLayout)
1098 {
1099   if(textParameters.text.empty())
1100   {
1101     Dali::Devel::PixelBuffer pixelBuffer = Dali::Devel::PixelBuffer::New(textParameters.textWidth,
1102                                                                          textParameters.textHeight,
1103                                                                          Dali::Pixel::RGBA8888);
1104
1105     const unsigned int bufferSize = textParameters.textWidth * textParameters.textHeight * Dali::Pixel::GetBytesPerPixel(Dali::Pixel::RGBA8888);
1106     unsigned char*     buffer     = pixelBuffer.GetBuffer();
1107     memset(buffer, 0, bufferSize);
1108
1109     return pixelBuffer;
1110   }
1111
1112   FontClient fontClient = FontClient::Get();
1113   MetricsPtr metrics;
1114   // Use this to access FontClient i.e. to get down-scaled Emoji metrics.
1115   metrics = Metrics::New(fontClient);
1116
1117   Text::ModelPtr    textModel = Text::Model::New();
1118   InternalDataModel internalData(fontClient, metrics, textModel);
1119
1120   TextAbstraction::TextRenderer::Parameters rendererParameters(internalData.textModel->mVisualModel->mGlyphs,
1121                                                                internalData.textModel->mVisualModel->mGlyphPositions,
1122                                                                internalData.textModel->mVisualModel->mColors,
1123                                                                internalData.textModel->mVisualModel->mColorIndices,
1124                                                                internalData.blendingMode,
1125                                                                internalData.isEmoji);
1126
1127   rendererParameters.width       = textParameters.textWidth;
1128   rendererParameters.height      = textParameters.textHeight;
1129   rendererParameters.pixelFormat = TextAbstraction::TextRenderer::Parameters::RGBA8888; // @note: At the moment all textures are generated RGBA8888
1130
1131   ////////////////////////////////////////////////////////////////////////////////
1132   // Process the markup string if the mark-up processor is enabled.
1133   ////////////////////////////////////////////////////////////////////////////////
1134   ShapeTextPreprocess(textParameters, rendererParameters, internalData);
1135
1136   ////////////////////////////////////////////////////////////////////////////////
1137   // Retrieve the glyphs. Text shaping
1138   ////////////////////////////////////////////////////////////////////////////////
1139   ShapeText(rendererParameters, embeddedItemLayout, internalData);
1140
1141   ////////////////////////////////////////////////////////////////////////////////
1142   // Retrieve the glyph's metrics.
1143   ////////////////////////////////////////////////////////////////////////////////
1144
1145   metrics->GetGlyphMetrics(rendererParameters.glyphs.Begin(), internalData.numberOfGlyphs);
1146
1147   ////////////////////////////////////////////////////////////////////////////////
1148   // Set the color runs in glyphs.
1149   ////////////////////////////////////////////////////////////////////////////////
1150   SetColorSegmentation(textParameters, internalData);
1151
1152   ////////////////////////////////////////////////////////////////////////////////
1153   // Set the isEmoji Vector
1154   ////////////////////////////////////////////////////////////////////////////////
1155   SetEmojiVector(internalData);
1156
1157   ////////////////////////////////////////////////////////////////////////////////
1158   // Layout the text
1159   ////////////////////////////////////////////////////////////////////////////////
1160   Size newLayoutSize = LayoutText(textParameters, rendererParameters, embeddedItemLayout, internalData);
1161
1162   ////////////////////////////////////////////////////////////////////////////////
1163   // Align the text.
1164   ////////////////////////////////////////////////////////////////////////////////
1165   Align(textParameters, rendererParameters, embeddedItemLayout, internalData, newLayoutSize);
1166
1167   ////////////////////////////////////////////////////////////////////////////////
1168   // Ellipsis the text.
1169   ////////////////////////////////////////////////////////////////////////////////
1170   Ellipsis(textParameters, rendererParameters, embeddedItemLayout, internalData);
1171
1172   ////////////////////////////////////////////////////////////////////////////////
1173   // Render the text.
1174   ////////////////////////////////////////////////////////////////////////////////
1175   return RenderText(textParameters, rendererParameters);
1176 }
1177
1178 Devel::PixelBuffer CreateShadow(const ShadowParameters& shadowParameters)
1179 {
1180   // The size of the pixel data.
1181   const int width  = static_cast<int>(shadowParameters.input.GetWidth());
1182   const int height = static_cast<int>(shadowParameters.input.GetHeight());
1183
1184   // The shadow's offset.
1185   const int xOffset = static_cast<int>(shadowParameters.offset.x);
1186   const int yOffset = static_cast<int>(shadowParameters.offset.y);
1187
1188   // The size in bytes of the pixel of the input's buffer.
1189   const Pixel::Format inputFormat    = shadowParameters.input.GetPixelFormat();
1190   const unsigned int  inputPixelSize = Pixel::GetBytesPerPixel(inputFormat);
1191   const bool          isA8           = Pixel::A8 == inputFormat;
1192
1193   // Creates the output pixel buffer.
1194   Devel::PixelBuffer outputPixelBuffer = Devel::PixelBuffer::New(width, height, Pixel::RGBA8888);
1195
1196   // Clear the output buffer
1197   unsigned char* outputPixelBufferPtr = outputPixelBuffer.GetBuffer();
1198   memset(outputPixelBufferPtr, 0, width * height * Pixel::GetBytesPerPixel(Pixel::RGBA8888));
1199
1200   // Gets the buffer of the input pixel buffer.
1201   const unsigned char* const inputPixelBuffer = shadowParameters.input.GetBuffer();
1202
1203   float textColor[4u];
1204   if(isA8)
1205   {
1206     memcpy(textColor, shadowParameters.textColor.AsFloat(), 4u * sizeof(float));
1207   }
1208   const float* const shadowColor = shadowParameters.color.AsFloat();
1209
1210   // Traverse the input pixel buffer and write the text on the foreground and the shadow on the background.
1211   for(int rowIndex = 0; rowIndex < height; ++rowIndex)
1212   {
1213     // Calculates the rowIndex to the input pixel buffer for the shadow and whether it's within the boundaries.
1214     const int  yOffsetIndex    = rowIndex - yOffset;
1215     const bool isValidRowIndex = ((yOffsetIndex >= 0) && (yOffsetIndex < height));
1216
1217     const int rows       = rowIndex * width;
1218     const int offsetRows = yOffsetIndex * width;
1219     for(int columnIndex = 0; columnIndex < width; ++columnIndex)
1220     {
1221       // Index to the input buffer to retrieve the alpha value of the foreground text.
1222       const unsigned int index = inputPixelSize * static_cast<unsigned int>(rows + columnIndex);
1223
1224       // Build the index to the input buffer to retrieve the alpha value of the background shadow.
1225       unsigned int shadowIndex        = 0u;
1226       bool         isValidShadowIndex = false;
1227       if(isValidRowIndex)
1228       {
1229         const int xOffsetIndex = columnIndex - xOffset;
1230         isValidShadowIndex     = ((xOffsetIndex >= 0) && (xOffsetIndex < width));
1231
1232         if(isValidShadowIndex)
1233         {
1234           shadowIndex = inputPixelSize * static_cast<unsigned int>(offsetRows + xOffsetIndex);
1235         }
1236       }
1237
1238       // If the input buffer is an alpha mask, retrieve the values for the foreground text and the background shadow.
1239       // If not retrieve the color.
1240       float inputShadowOffsetAlphaValue = 1.f;
1241       float inputAlphaValue             = 1.f;
1242       if(isA8)
1243       {
1244         // Retrieve the alpha value for the shadow.
1245         inputShadowOffsetAlphaValue = isValidShadowIndex ? (static_cast<float>(*(inputPixelBuffer + shadowIndex)) / 255.f) : 0.f;
1246
1247         // Retrieve the alpha value for the text.
1248         inputAlphaValue = static_cast<float>(*(inputPixelBuffer + index)) / 255.f;
1249       }
1250       else
1251       {
1252         // The input buffer is not an alpha mask. Retrieve the color.
1253         textColor[0u]               = TO_FLOAT * static_cast<float>(*(inputPixelBuffer + index + 0u));
1254         textColor[1u]               = TO_FLOAT * static_cast<float>(*(inputPixelBuffer + index + 1u));
1255         textColor[2u]               = TO_FLOAT * static_cast<float>(*(inputPixelBuffer + index + 2u));
1256         textColor[3u]               = TO_FLOAT * static_cast<float>(*(inputPixelBuffer + index + 3u));
1257         inputAlphaValue             = textColor[3u];
1258         inputShadowOffsetAlphaValue = isValidShadowIndex ? TO_FLOAT * static_cast<float>(*(inputPixelBuffer + shadowIndex + 3u)) : 0.f;
1259       }
1260
1261       // Build the output color.
1262       float outputColor[4u];
1263
1264       if(shadowParameters.blendShadow)
1265       {
1266         // Blend the shadow's color with the text's color on top
1267         const float textAlpha   = textColor[3u] * inputAlphaValue;
1268         const float shadowAlpha = shadowColor[3u] * inputShadowOffsetAlphaValue;
1269
1270         // Blends the alpha.
1271         outputColor[3u]              = 1.f - ((1.f - textAlpha) * (1.f - shadowAlpha));
1272         const bool isOutputAlphaZero = outputColor[3u] < Dali::Math::MACHINE_EPSILON_1000;
1273         if(isOutputAlphaZero)
1274         {
1275           std::fill(outputColor, outputColor + 4u, 0.f);
1276         }
1277         else
1278         {
1279           // Blends the RGB components.
1280           float shadowComponent = 0.f;
1281           float textComponent   = 0.f;
1282
1283           shadowComponent = shadowColor[0u] * inputShadowOffsetAlphaValue;
1284           textComponent   = textColor[0u] * inputAlphaValue;
1285           outputColor[0u] = (textComponent * textAlpha / outputColor[3u]) + (shadowComponent * shadowAlpha * (1.f - textAlpha) / outputColor[3u]);
1286
1287           shadowComponent = shadowColor[1u] * inputShadowOffsetAlphaValue;
1288           textComponent   = textColor[1u] * inputAlphaValue;
1289           outputColor[1u] = (textComponent * textAlpha / outputColor[3u]) + (shadowComponent * shadowAlpha * (1.f - textAlpha) / outputColor[3u]);
1290
1291           shadowComponent = shadowColor[2u] * inputShadowOffsetAlphaValue;
1292           textComponent   = textColor[2u] * inputAlphaValue;
1293           outputColor[2u] = (textComponent * textAlpha / outputColor[3u]) + (shadowComponent * shadowAlpha * (1.f - textAlpha) / outputColor[3u]);
1294         }
1295       }
1296       else
1297       {
1298         // No blending!!!
1299         std::fill(outputColor, outputColor + 4u, 0.f);
1300
1301         const float textAlpha   = textColor[3u];
1302         const float shadowAlpha = shadowColor[3u] * inputShadowOffsetAlphaValue;
1303
1304         // Write shadow first.
1305         if(shadowAlpha > Dali::Math::MACHINE_EPSILON_1000)
1306         {
1307           outputColor[0u] = shadowColor[0u] * inputShadowOffsetAlphaValue;
1308           outputColor[1u] = shadowColor[1u] * inputShadowOffsetAlphaValue;
1309           outputColor[2u] = shadowColor[2u] * inputShadowOffsetAlphaValue;
1310           outputColor[3u] = shadowAlpha;
1311         }
1312
1313         // Write character on top.
1314         if(textAlpha > Dali::Math::MACHINE_EPSILON_1000)
1315         {
1316           outputColor[0u] = textColor[0u];
1317           outputColor[1u] = textColor[1u];
1318           outputColor[2u] = textColor[2u];
1319           outputColor[3u] = textAlpha;
1320         }
1321       }
1322
1323       // Write the color into the output pixel buffer.
1324       const unsigned int outputIndex             = 4u * (rows + columnIndex);
1325       *(outputPixelBufferPtr + outputIndex + 0u) = static_cast<unsigned char>(TO_UCHAR * outputColor[0u]);
1326       *(outputPixelBufferPtr + outputIndex + 1u) = static_cast<unsigned char>(TO_UCHAR * outputColor[1u]);
1327       *(outputPixelBufferPtr + outputIndex + 2u) = static_cast<unsigned char>(TO_UCHAR * outputColor[2u]);
1328       *(outputPixelBufferPtr + outputIndex + 3u) = static_cast<unsigned char>(TO_UCHAR * outputColor[3u]);
1329     }
1330   }
1331
1332   // Returns the pixel buffer.
1333   return outputPixelBuffer;
1334 }
1335
1336 Devel::PixelBuffer ConvertToRgba8888(Devel::PixelBuffer pixelBuffer, const Vector4& color, bool multiplyByAlpha)
1337 {
1338   if(Dali::Pixel::A8 != pixelBuffer.GetPixelFormat())
1339   {
1340     // Does nothing.
1341     return pixelBuffer;
1342   }
1343
1344   const unsigned int width          = pixelBuffer.GetWidth();
1345   const unsigned int height         = pixelBuffer.GetHeight();
1346   Devel::PixelBuffer newPixelBuffer = Devel::PixelBuffer::New(width, height, Dali::Pixel::RGBA8888);
1347
1348   unsigned char*             dstBuffer = newPixelBuffer.GetBuffer();
1349   const unsigned char* const srcBuffer = pixelBuffer.GetBuffer();
1350
1351   const unsigned char r = static_cast<unsigned char>(TO_UCHAR * color.r);
1352   const unsigned char g = static_cast<unsigned char>(TO_UCHAR * color.g);
1353   const unsigned char b = static_cast<unsigned char>(TO_UCHAR * color.b);
1354
1355   unsigned char dstColor[4];
1356   for(unsigned int j = 0u; j < height; ++j)
1357   {
1358     const unsigned int lineIndex = j * width;
1359     for(unsigned int i = 0u; i < width; ++i)
1360     {
1361       const unsigned int srcIndex = lineIndex + i;
1362
1363       const float srcAlpha = static_cast<float>(*(srcBuffer + srcIndex));
1364
1365       if(multiplyByAlpha)
1366       {
1367         dstColor[0u] = static_cast<unsigned char>(srcAlpha * color.r);
1368         dstColor[1u] = static_cast<unsigned char>(srcAlpha * color.g);
1369         dstColor[2u] = static_cast<unsigned char>(srcAlpha * color.b);
1370         dstColor[3u] = static_cast<unsigned char>(srcAlpha * color.a);
1371       }
1372       else
1373       {
1374         dstColor[0u] = r;
1375         dstColor[1u] = g;
1376         dstColor[2u] = b;
1377         dstColor[3u] = static_cast<unsigned char>(srcAlpha);
1378       }
1379
1380       const unsigned int dstIndex = srcIndex * 4u;
1381       memcpy(dstBuffer + dstIndex, dstColor, 4u);
1382     }
1383   }
1384
1385   return newPixelBuffer;
1386 }
1387
1388 void UpdateBuffer(Devel::PixelBuffer src, Devel::PixelBuffer dst, unsigned int x, unsigned int y, bool blend)
1389 {
1390   const Dali::Pixel::Format pixelFormat = dst.GetPixelFormat();
1391   if(src.GetPixelFormat() != pixelFormat)
1392   {
1393     DALI_LOG_ERROR("PixelBuffer::SetBuffer. The pixel format of the new data must be the same of the current pixel buffer.");
1394     return;
1395   }
1396
1397   const unsigned int srcWidth  = src.GetWidth();
1398   const unsigned int srcHeight = src.GetHeight();
1399   const unsigned int dstWidth  = dst.GetWidth();
1400   const unsigned int dstHeight = dst.GetHeight();
1401
1402   if((x > dstWidth) ||
1403      (y > dstHeight) ||
1404      (x + srcWidth > dstWidth) ||
1405      (y + srcHeight > dstHeight))
1406   {
1407     DALI_LOG_ERROR("PixelBuffer::SetBuffer. The source pixel buffer is out of the boundaries of the destination pixel buffer.");
1408     return;
1409   }
1410
1411   const unsigned int bytesPerPixel = Dali::Pixel::GetBytesPerPixel(pixelFormat);
1412   // Ignore when pixelFormat is invalid or contain float
1413   if(bytesPerPixel == 0u || bytesPerPixel == 6u || bytesPerPixel == 12u)
1414   {
1415     return;
1416   }
1417   const unsigned int alphaIndex = bytesPerPixel - 1u;
1418
1419   const unsigned char* const srcBuffer = src.GetBuffer();
1420   unsigned char*             dstBuffer = dst.GetBuffer();
1421
1422   if(!blend)
1423   {
1424     const unsigned int currentLineSize = dstWidth * bytesPerPixel;
1425     const unsigned int newLineSize     = srcWidth * bytesPerPixel;
1426     unsigned char*     currentBuffer   = dstBuffer + (y * dstWidth + x) * bytesPerPixel;
1427     for(unsigned int j = 0u; j < srcHeight; ++j)
1428     {
1429       memcpy(currentBuffer + j * currentLineSize, srcBuffer + j * newLineSize, newLineSize);
1430     }
1431   }
1432   else
1433   {
1434     float outputColor[4u];
1435
1436     // Blend the src pixel buffer with the dst pixel buffer as background.
1437     //
1438     //  fgColor, fgAlpha, bgColor, bgAlpha
1439     //
1440     //  alpha = 1 - ( 1 - fgAlpha ) * ( 1 - bgAlpha )
1441     //  color = ( fgColor * fgAlpha / alpha ) + ( bgColor * bgAlpha * ( 1 - fgAlpha ) / alpha )
1442
1443     // Jump till the 'x,y' position
1444     const unsigned int dstWidthBytes = dstWidth * bytesPerPixel;
1445     dstBuffer += (y * dstWidthBytes + x * bytesPerPixel);
1446
1447     for(unsigned int j = 0u; j < srcHeight; ++j)
1448     {
1449       const unsigned int srcLineIndex = j * srcWidth;
1450       for(unsigned int i = 0u; i < srcWidth; ++i)
1451       {
1452         const float srcAlpha = TO_FLOAT * static_cast<float>(*(srcBuffer + bytesPerPixel * (srcLineIndex + i) + alphaIndex));
1453         const float dstAlpha = TO_FLOAT * static_cast<float>(*(dstBuffer + i * bytesPerPixel + alphaIndex));
1454
1455         // Blends the alpha channel.
1456         const float oneMinusSrcAlpha = 1.f - srcAlpha;
1457         outputColor[alphaIndex]      = 1.f - (oneMinusSrcAlpha * (1.f - dstAlpha));
1458
1459         // Blends the RGB channels.
1460         const bool isOutputAlphaZero = outputColor[alphaIndex] < Dali::Math::MACHINE_EPSILON_1000;
1461         if(isOutputAlphaZero)
1462         {
1463           std::fill(outputColor, outputColor + bytesPerPixel, 0.f);
1464         }
1465         else
1466         {
1467           const float srcAlphaOverOutputAlpha                 = srcAlpha / outputColor[alphaIndex];                    // fgAlpha / alpha
1468           const float dstAlphaOneMinusSrcAlphaOverOutputAlpha = dstAlpha * oneMinusSrcAlpha / outputColor[alphaIndex]; // bgAlpha * ( 1 - fgAlpha ) / alpha
1469           for(unsigned int index = 0u; index < alphaIndex; ++index)
1470           {
1471             const float dstComponent = TO_FLOAT * static_cast<float>(*(dstBuffer + i * bytesPerPixel + index)) * dstAlpha;
1472             const float srcComponent = TO_FLOAT * static_cast<float>(*(srcBuffer + bytesPerPixel * (srcLineIndex + i) + index)) * srcAlpha;
1473             outputColor[index]       = (srcComponent * srcAlphaOverOutputAlpha) + (dstComponent * dstAlphaOneMinusSrcAlphaOverOutputAlpha);
1474           }
1475         }
1476
1477         for(unsigned int index = 0u; index < bytesPerPixel; ++index)
1478         {
1479           *(dstBuffer + i * bytesPerPixel + index) = static_cast<unsigned char>(TO_UCHAR * outputColor[index]);
1480         }
1481       }
1482
1483       dstBuffer += dstWidthBytes;
1484     }
1485   }
1486 }
1487
1488 Dali::Property::Array RenderForLastIndex(RendererParameters& textParameters)
1489 {
1490   Property::Array offsetValues;
1491   if(textParameters.text.empty())
1492   {
1493     return offsetValues;
1494   }
1495   FontClient fontClient = FontClient::Get();
1496   MetricsPtr metrics;
1497   metrics = Metrics::New(fontClient);
1498
1499   Text::ModelPtr    textModel = Text::Model::New();
1500   InternalDataModel internalData(fontClient, metrics, textModel);
1501
1502   TextAbstraction::TextRenderer::Parameters rendererParameters(textModel->mVisualModel->mGlyphs,
1503                                                                textModel->mVisualModel->mGlyphPositions,
1504                                                                textModel->mVisualModel->mColors,
1505                                                                textModel->mVisualModel->mColorIndices,
1506                                                                internalData.blendingMode,
1507                                                                internalData.isEmoji);
1508
1509   rendererParameters.width  = textParameters.textWidth;
1510   rendererParameters.height = textParameters.textHeight;
1511
1512   ////////////////////////////////////////////////////////////////////////////////
1513   // Process the markup string if the mark-up processor is enabled.
1514   ////////////////////////////////////////////////////////////////////////////////
1515   ShapeTextPreprocess(textParameters, rendererParameters, internalData);
1516
1517   ////////////////////////////////////////////////////////////////////////////////
1518   // Retrieve the glyphs. Text shaping
1519   ////////////////////////////////////////////////////////////////////////////////
1520   Dali::Vector<Dali::Toolkit::DevelText::EmbeddedItemInfo> embeddedItemLayout;
1521   ShapeText(rendererParameters, embeddedItemLayout, internalData);
1522
1523   ////////////////////////////////////////////////////////////////////////////////
1524   // Retrieve the glyph's metrics.
1525   ////////////////////////////////////////////////////////////////////////////////
1526   metrics->GetGlyphMetrics(rendererParameters.glyphs.Begin(), internalData.numberOfGlyphs);
1527
1528   ////////////////////////////////////////////////////////////////////////////////
1529   // Layout the text
1530   ////////////////////////////////////////////////////////////////////////////////
1531   int boundingBox           = textParameters.textHeight - (textParameters.padding.top + textParameters.padding.bottom);
1532   textParameters.textHeight = MAX_INT; // layout for the entire area.
1533   LayoutText(textParameters, rendererParameters, embeddedItemLayout, internalData);
1534
1535   ////////////////////////////////////////////////////////////////////////////////
1536   // Calculation last character index
1537   ////////////////////////////////////////////////////////////////////////////////
1538   Vector<LineRun>& lines              = internalData.textModel->mVisualModel->mLines;
1539   unsigned int     numberOfLines      = lines.Count();
1540   int              numberOfCharacters = 0;
1541   float            penY               = 0.f;
1542   float            lineSize           = internalData.layoutEngine.GetDefaultLineSize();
1543   float            lineOffset         = 0.f;
1544   bool             isLastLine;
1545   for(unsigned int index = 0u; index < numberOfLines; ++index)
1546   {
1547     const LineRun& line = *(lines.Begin() + index);
1548     numberOfCharacters += line.characterRun.numberOfCharacters;
1549     isLastLine = (index == numberOfLines - 1);
1550
1551     lineOffset = lineSize > 0.f ? lineSize : GetLineHeight(line, isLastLine);
1552     penY += lineOffset;
1553     if((penY + lineOffset) > boundingBox)
1554     {
1555       offsetValues.PushBack(numberOfCharacters);
1556       penY = 0.f;
1557     }
1558   }
1559   if(penY > 0.f)
1560   {
1561     // add remain character index
1562     offsetValues.PushBack(numberOfCharacters);
1563   }
1564
1565   return offsetValues;
1566 }
1567
1568 Dali::Property::Array GetLastCharacterIndex(RendererParameters& textParameters)
1569 {
1570   Dali::Property::Array offsetValues = Toolkit::DevelText::RenderForLastIndex(textParameters);
1571   return offsetValues;
1572 }
1573
1574 } // namespace DevelText
1575
1576 } // namespace Toolkit
1577
1578 } // namespace Dali