X-Git-Url: http://review.tizen.org/git/?p=platform%2Fcore%2Fuifw%2Fdali-toolkit.git;a=blobdiff_plain;f=dali-toolkit%2Fpublic-api%2Ftext%2Fshaper.cpp;h=54444ace5a6000c98666243cdd66facc7e6a669a;hp=3be21ab0976dfde95088cb7b582ff69bc5601635;hb=8363c13a95006c0cbfe3074e9b601bdaef9537f5;hpb=2dd044328238768ae8b27a223cb7d0f5cda53513

diff --git a/dali-toolkit/public-api/text/shaper.cpp b/dali-toolkit/public-api/text/shaper.cpp
index 3be21ab..54444ac 100644
--- a/dali-toolkit/public-api/text/shaper.cpp
+++ b/dali-toolkit/public-api/text/shaper.cpp
@@ -18,6 +18,13 @@
 // CLASS HEADER
 #include <dali-toolkit/public-api/text/shaper.h>
 
+// INTERNAL INCLUDES
+#include <dali/public-api/text-abstraction/shaping.h>
+#include <dali-toolkit/public-api/text/font-run.h>
+#include <dali-toolkit/public-api/text/logical-model.h>
+#include <dali-toolkit/public-api/text/script-run.h>
+#include <dali-toolkit/public-api/text/visual-model.h>
+
 namespace Dali
 {
 
@@ -27,6 +34,12 @@ namespace Toolkit
 namespace Text
 {
 
+CharacterIndex min( CharacterIndex index0,
+                    CharacterIndex index1 )
+{
+  return ( index0 < index1 ) ? index0 : index1;
+}
+
 void ShapeText( const Vector<Character>& text,
                 const Vector<LineBreakInfo>& lineBreakInfo,
                 const Vector<ScriptRun>& scripts,
@@ -35,6 +48,129 @@ void ShapeText( const Vector<Character>& text,
                 Vector<CharacterIndex>& characterIndices,
                 Vector<Length>& charactersPerGlyph )
 {
+  const Length numberOfCharacters = text.Count();
+
+  if( 0u == numberOfCharacters )
+  {
+    // Nothing to do if there are no characters.
+    return;
+  }
+
+  const Length numberOfFontRuns = fonts.Count();
+
+  DALI_ASSERT_DEBUG( ( 0u != numberOfFontRuns ) &&
+                     ( numberOfCharacters == fonts[numberOfFontRuns - 1u].characterRun.characterIndex + fonts[numberOfFontRuns - 1u].characterRun.numberOfCharacters ) &&
+                     "Toolkit::Text::ShapeText. All characters must have a font set." );
+
+  const Length numberOfScriptRuns = scripts.Count();
+
+  DALI_ASSERT_DEBUG( ( 0u != numberOfScriptRuns ) &&
+                     ( numberOfCharacters == scripts[numberOfScriptRuns - 1u].characterRun.characterIndex + scripts[numberOfScriptRuns - 1u].characterRun.numberOfCharacters ) &&
+                     "Toolkit::Text::ShapeText. All characters must have a script set." );
+
+  // The text needs to be split in chunks of consecutive characters.
+  // Each chunk must contain characters with the same font id and script set.
+  // A chunk of consecutive characters must not contain a LINE_MUST_BREAK, if there is one a new chunk have to be created.
+
+  TextAbstraction::Shaping shaping = TextAbstraction::Shaping::Get();
+
+  // To shape the text a font and an script is needed.
+  Vector<FontRun>::ConstIterator fontRunIt = fonts.Begin();
+  Vector<ScriptRun>::ConstIterator scriptRunIt = scripts.Begin();
+
+  // The line must break token converted to LineBreakInfo to be compared and avoid a compile error.
+  const LineBreakInfo MUST_BREAK = static_cast<LineBreakInfo>( TextAbstraction::LINE_MUST_BREAK );
+
+  // Index to the the next one to be shaped. Is pointing the character after the last one it was shaped.
+  CharacterIndex previousIndex = 0u;
+
+  // The current font id and script used to shape the text.
+  FontId currentFontId = 0u;
+  Script currentScript = TextAbstraction::UNKNOWN;
+
+  // Reserve some space to allocate the glyphs and the glyph to character map.
+  // There is no way to know the number of glyphs before shaping the text.
+  // To avoid reallocations it's reserved space for a slightly biger number of glyphs than the number of characters.
+
+  Length numberOfGlyphsReserved = static_cast<Length>( numberOfCharacters * 1.3f );
+  glyphs.Resize( numberOfGlyphsReserved );
+  charactersPerGlyph.Resize( numberOfGlyphsReserved );
+
+  // The actual number of glyphs.
+  Length totalNumberOfGlyphs = 0u;
+
+  // Traverse the characters and shape the text.
+  for( previousIndex = 0; previousIndex < numberOfCharacters; )
+  {
+    // Get the font id and the script.
+    const FontRun& fontRun = *fontRunIt;
+    const ScriptRun& scriptRun = *scriptRunIt;
+
+    currentFontId = fontRun.fontId;
+    currentScript = scriptRun.script;
+
+    // Get the min index to the last character of both runs.
+    CharacterIndex currentIndex = min( fontRun.characterRun.characterIndex + fontRun.characterRun.numberOfCharacters,
+                                       scriptRun.characterRun.characterIndex + scriptRun.characterRun.numberOfCharacters );
+
+    // Check if there is a line must break.
+    for( CharacterIndex index = previousIndex; index < currentIndex; ++index )
+    {
+      if( MUST_BREAK == lineBreakInfo.Begin() + index )
+      {
+        currentIndex = index;
+        break;
+      }
+    }
+
+    // Shape the text for the current chunk.
+    const Length numberOfGlyphs = shaping.Shape( text.Begin() + previousIndex,
+                                                 currentIndex - previousIndex,
+                                                 currentFontId,
+                                                 currentScript );
+
+    const Length glyphIndex = totalNumberOfGlyphs;
+    totalNumberOfGlyphs += numberOfGlyphs;
+
+    if( totalNumberOfGlyphs > numberOfGlyphsReserved )
+    {
+      // Resize the vectors to get enough space.
+      numberOfGlyphsReserved = static_cast<Length>( totalNumberOfGlyphs * 1.3f );
+      glyphs.Resize( numberOfGlyphsReserved );
+      charactersPerGlyph.Resize( numberOfGlyphsReserved );
+    }
+
+    // Retrieve the glyphs and the glyph to character conversion map.
+    shaping.GetGlyphs( glyphs.Begin() + glyphIndex,
+                       charactersPerGlyph.Begin() + glyphIndex );
+
+    // Update the iterators to get the next font or script run.
+    if( currentIndex == fontRun.characterRun.characterIndex + fontRun.characterRun.numberOfCharacters )
+    {
+      ++fontRunIt;
+    }
+    if( currentIndex == scriptRun.characterRun.characterIndex + scriptRun.characterRun.numberOfCharacters )
+    {
+      ++scriptRunIt;
+    }
+
+    // Update the previous index.
+    previousIndex = currentIndex;
+  }
+
+  characterIndices.Reserve( totalNumberOfGlyphs );
+  CharacterIndex characterIndex = 0u;
+  characterIndices.PushBack( characterIndex );
+  for( Length index = 0u, length = totalNumberOfGlyphs - 1u; index < length; ++index )
+  {
+    characterIndex += *( charactersPerGlyph.Begin() + index );
+    characterIndices.PushBack( characterIndex );
+  }
+
+  // Resize the vectors to set the right number of items.
+  glyphs.Resize( totalNumberOfGlyphs );
+  // characterIndices.Resize( totalNumberOfGlyphs );
+  charactersPerGlyph.Resize( totalNumberOfGlyphs );
 }
 
 } // namespace Text