X-Git-Url: http://review.tizen.org/git/?p=platform%2Fcore%2Fuifw%2Fdali-toolkit.git;a=blobdiff_plain;f=dali-toolkit%2Finternal%2Ftext%2Fmulti-language-support-impl.cpp;h=f6a9a2293716614dc8b52e820cb9df8930d8faba;hp=e0053c8500701aa7cbe07239ddf8f76bdfe3f148;hb=d83ef802ea8a21da2707c0053267064f6c1e8af7;hpb=1db0a8becea3dbdebaa942d934d91824a92434e7 diff --git a/dali-toolkit/internal/text/multi-language-support-impl.cpp b/dali-toolkit/internal/text/multi-language-support-impl.cpp index e0053c8..f6a9a22 100644 --- a/dali-toolkit/internal/text/multi-language-support-impl.cpp +++ b/dali-toolkit/internal/text/multi-language-support-impl.cpp @@ -18,17 +18,17 @@ // CLASS HEADER #include -// INTERNAL INCLUDES +// EXTERNAL INCLUDES +#include +#include #include #include + +// INTERNAL INCLUDES #include #include #include #include -#include - -// EXTERNAL INCLUDES -#include namespace Dali { @@ -116,6 +116,24 @@ Script GetScript( Length index, return script; } +/** + * @brief Whether the character is valid for all scripts. i.e. the white space. + * + * @param[in] character The character. + * + * @return @e true if the character is valid for all scripts. + */ +bool IsValidForAllScripts( Character character ) +{ + return ( IsWhiteSpace( character ) || + IsZeroWidthNonJoiner( character ) || + IsZeroWidthJoiner( character ) || + IsZeroWidthSpace( character ) || + IsLeftToRightMark( character ) || + IsRightToLeftMark( character ) || + IsThinSpace( character ) ); +} + bool ValidateFontsPerScript::FindValidFont( FontId fontId ) const { for( Vector::ConstIterator it = mValidFonts.Begin(), @@ -184,6 +202,7 @@ Text::MultilanguageSupport MultilanguageSupport::Get() } void MultilanguageSupport::SetScripts( const Vector& text, + const Vector& lineBreakInfo, Vector& scripts ) { const Length numberOfCharacters = text.Count(); @@ -194,8 +213,6 @@ void MultilanguageSupport::SetScripts( const Vector& text, return; } - // Traverse all characters and set the scripts. - // Stores the current script run. ScriptRun currentScriptRun; currentScriptRun.characterRun.characterIndex = 0u; @@ -205,35 +222,92 @@ void MultilanguageSupport::SetScripts( const Vector& text, // Reserve some space to reduce the number of reallocations. scripts.Reserve( numberOfCharacters << 2u ); - for( Length index = 0u; index < numberOfCharacters; ++index ) - { - const Character character = *( text.Begin() + index ); + // Whether the first valid script need to be set. + bool firstValidScript = true; - Script script = GetCharacterScript( character ); + // Whether the first valid script is a right to left script. + bool isParagraphRTL = false; - if( TextAbstraction::UNKNOWN == script ) + // Count the number of characters which are valid for all scripts. i.e. white spaces or '\n'. + Length numberOfAllScriptCharacters = 0u; + + // Pointers to the text and break info buffers. + const Character* textBuffer = text.Begin(); + const LineBreakInfo* breakInfoBuffer = lineBreakInfo.Begin(); + + // Traverse all characters and set the scripts. + for( Length index = 0u; index < numberOfCharacters; ++index ) + { + Character character = *( textBuffer + index ); + LineBreakInfo breakInfo = *( breakInfoBuffer + index ); + + // Some characters (like white spaces) are valid for many scripts. The rules to set a script + // for them are: + // - If they are at the begining of a paragraph they get the script of the first character with + // a defined script. If they are at the end, they get the script of the last one. + // - If they are between two scripts with the same direction, they get the script of the previous + // character with a defined script. If the two scripts have different directions, they get the + // script of the first character of the paragraph with a defined script. + + // Skip those characters valid for many scripts like white spaces or '\n'. + bool endOfText = index == numberOfCharacters; + while( !endOfText && + IsValidForAllScripts( character ) ) { - if( IsZeroWidthNonJoiner( character ) || - IsZeroWidthJoiner( character ) || - IsZeroWidthSpace( character ) || - IsLeftToRightMark( character ) || - IsRightToLeftMark( character ) || - IsThinSpace( character ) ) + // Count all these characters to be added into a script. + ++numberOfAllScriptCharacters; + + if( TextAbstraction::LINE_MUST_BREAK == breakInfo ) { - // Keep previous script if the character is a zero width joiner or a zero width non joiner. - script = currentScriptRun.script; + // The next character is a new paragraph. + // Know when there is a new paragraph is needed because if there is a white space + // between two scripts with different directions, it is added to the script with + // the same direction than the first script of the paragraph. + firstValidScript = true; + isParagraphRTL = false; } - else + + // Get the next character. + ++index; + endOfText = index == numberOfCharacters; + if( !endOfText ) { - script = TextAbstraction::LATIN; - DALI_ASSERT_DEBUG( !"MultilanguageSupport::SetScripts. Unkown script!" ); + character = *( textBuffer + index ); + breakInfo = *( breakInfoBuffer + index ); } } + if( endOfText ) + { + // Last characters of the text are 'white spaces'. + // There is nothing else to do. Just add the remaining characters to the last script after this bucle. + break; + } + + // Get the script of the character. + Script script = GetCharacterScript( character ); + + // Check if it is the first character of a paragraph. + if( firstValidScript && + ( TextAbstraction::UNKNOWN != script ) ) + { + // Sets the direction of the first valid script. + isParagraphRTL = ( TextAbstraction::ARABIC == script ); + firstValidScript = false; + } + if( script != currentScriptRun.script ) { // Current run needs to be stored and a new one initialized. + if( isParagraphRTL != ( TextAbstraction::ARABIC == script ) ) + { + // Current script has different direction than the first script of the paragraph. + // All the previously skipped characters need to be added to the previous script before it's stored. + currentScriptRun.characterRun.numberOfCharacters += numberOfAllScriptCharacters; + numberOfAllScriptCharacters = 0u; + } + if( 0u != currentScriptRun.characterRun.numberOfCharacters ) { // Store the script run. @@ -242,16 +316,38 @@ void MultilanguageSupport::SetScripts( const Vector& text, // Initialize the new one. currentScriptRun.characterRun.characterIndex = currentScriptRun.characterRun.characterIndex + currentScriptRun.characterRun.numberOfCharacters; - currentScriptRun.characterRun.numberOfCharacters = 0u; + currentScriptRun.characterRun.numberOfCharacters = numberOfAllScriptCharacters; // Adds the white spaces which are at the begining of the script. currentScriptRun.script = script; + numberOfAllScriptCharacters = 0u; + } + else + { + // Adds white spaces between characters. + currentScriptRun.characterRun.numberOfCharacters += numberOfAllScriptCharacters; + numberOfAllScriptCharacters = 0u; + } + + if( TextAbstraction::LINE_MUST_BREAK == breakInfo ) + { + // The next character is a new paragraph. + firstValidScript = true; + isParagraphRTL = false; } // Add one more character to the run. ++currentScriptRun.characterRun.numberOfCharacters; } + // Add remaining characters into the last script. + currentScriptRun.characterRun.numberOfCharacters += numberOfAllScriptCharacters; if( 0u != currentScriptRun.characterRun.numberOfCharacters ) { + if( TextAbstraction::UNKNOWN == currentScriptRun.script ) + { + // There are only white spaces in the last script. Set the latin script. + currentScriptRun.script = TextAbstraction::LATIN; + } + // Store the last run. scripts.PushBack( currentScriptRun ); }