#include <dali/public-api/text-abstraction/font-client.h>
// INTERNAL INCLUDES
-#include <dali-toolkit/internal/text/logical-model.h>
-#include <dali-toolkit/internal/text/visual-model.h>
+#include <dali-toolkit/internal/text/layouts/layout-parameters.h>
+#include <dali-toolkit/internal/text/bidirectional-line-info-run.h>
namespace Dali
{
namespace Text
{
+/**
+ * @brief Stores temporary layout info of the line.
+ */
+struct LineLayout
+{
+ GlyphIndex glyphIndex; ///< Index of the first glyph to be laid-out.
+ CharacterIndex characterIndex; ///< Index of the first character to be laid-out.
+ Length numberOfCharacters; ///< The number of characters which fit in one line.
+ Length numberOfGlyphs; ///< The number of glyph which fit in one line.
+ float length; ///< The length of the glyphs which fit in one line.
+ float widthAdvanceDiff; ///< The difference between the width and the advance of the last glyph.
+ float wsLengthEndOfLine; ///< The length of the white spaces at the end of the line.
+ float ascender; ///< The maximum ascender of all fonts in the line.
+ float descender; ///< The maximum descender of all fonts in the line.
+};
+
struct LayoutEngine::Impl
{
Impl()
- : mLayout( LayoutEngine::SINGLE_LINE_BOX )
+ : mLayout( LayoutEngine::SINGLE_LINE_BOX ),
+ mHorizontalAlignment( LayoutEngine::HORIZONTAL_ALIGN_BEGIN ),
+ mVerticalAlignment( LayoutEngine::VERTICAL_ALIGN_TOP )
{
mFontClient = TextAbstraction::FontClient::Get();
}
- void UpdateVisualModel( const Vector2& boundingBox,
- const Vector<GlyphInfo>& glyphs,
- const Vector<CharacterIndex>& characterIndices,
- const Vector<Length>& charactersPerGlyph,
- VisualModel& visualModel )
+ /**
+ * Retrieves the line layout for a given box width.
+ */
+ void GetLineLayoutForBox( const LayoutParameters& parameters,
+ LineLayout& lineLayout )
{
- // TODO Switch between different layouts
+ // Initializes the line layout.
+ lineLayout.numberOfCharacters = 0u;
+ lineLayout.numberOfGlyphs = 0u;
+ lineLayout.length = 0.f;
+ lineLayout.wsLengthEndOfLine = 0.f;
+ lineLayout.ascender = 0.f;
+ lineLayout.descender = 0.f;
+
+ // Get the last glyph index.
+ const GlyphIndex lastGlyphIndex = parameters.totalNumberOfGlyphs - 1u;
+
+ FontId lastFontId = 0u;
+ for( GlyphIndex glyphIndex = lineLayout.glyphIndex;
+ glyphIndex < parameters.totalNumberOfGlyphs;
+ ++glyphIndex )
+ {
+ // Get the glyph info.
+ const GlyphInfo& glyphInfo = *( parameters.glyphsBuffer + glyphIndex );
- visualModel.SetGlyphs( &glyphs[0],
- &characterIndices[0],
- &charactersPerGlyph[0],
- glyphs.Count() );
+ // Check whether is a white space.
+ const Character character = *( parameters.textBuffer + lineLayout.numberOfCharacters );
+ const bool isWhiteSpace = TextAbstraction::IsWhiteSpace( character );
+
+ // Get the character indices for the current glyph. The last character index is needed
+ // because there are glyphs formed by more than one character but their break info is
+ // given only for the last character.
+ const Length charactersPerGlyph = *( parameters.charactersPerGlyphBuffer + glyphIndex );
+
+ // Increase the number of characters.
+ lineLayout.numberOfCharacters += charactersPerGlyph;
+
+ // Increase the number of glyphs.
+ lineLayout.numberOfGlyphs++;
+
+ // Increase the accumulated length.
+ const float glyphLength = ( glyphIndex == lastGlyphIndex ) ? glyphInfo.width : glyphInfo.advance;
+
+ if( isWhiteSpace )
+ {
+ // Add the length to the length of white spaces at the end of the line.
+ lineLayout.wsLengthEndOfLine += glyphLength;
+ }
+ else
+ {
+ // Add as well any previous white space length.
+ lineLayout.length += lineLayout.wsLengthEndOfLine + glyphLength;
+
+ // Clear the white space length at the end of the line.
+ lineLayout.wsLengthEndOfLine = 0.f;
+ }
+
+ if( lastFontId != glyphInfo.fontId )
+ {
+ Text::FontMetrics fontMetrics;
+ mFontClient.GetFontMetrics( glyphInfo.fontId, fontMetrics );
+
+ // Sets the maximum ascender.
+ if( fontMetrics.ascender > lineLayout.ascender )
+ {
+ lineLayout.ascender = fontMetrics.ascender;
+ }
+
+ // Sets the maximum descender.
+ if( fontMetrics.descender > lineLayout.descender )
+ {
+ lineLayout.descender = fontMetrics.descender;
+ }
- UpdateGlyphPositions( boundingBox, visualModel );
+ lastFontId = glyphInfo.fontId;
+ }
+ }
}
- void UpdateGlyphPositions( const Vector2& boundingBox, VisualModel& visualModel )
+ /**
+ * Retrieves the line layout for a given box width.
+ */
+ void GetMultiLineLayoutForBox( const LayoutParameters& parameters,
+ LineLayout& lineLayout )
{
- if( LayoutEngine::SINGLE_LINE_BOX == mLayout )
+ // Initializes the line layout.
+ lineLayout.numberOfCharacters = 0u;
+ lineLayout.numberOfGlyphs = 0u;
+ lineLayout.length = 0.f;
+ lineLayout.widthAdvanceDiff = 0.f;
+ lineLayout.wsLengthEndOfLine = 0.f;
+ lineLayout.ascender = 0.f;
+ lineLayout.descender = 0.f;
+
+ // Stores temporary line layout which has not been added to the final line layout.
+ LineLayout tmpLineLayout;
+ tmpLineLayout.numberOfCharacters = 0u;
+ tmpLineLayout.numberOfGlyphs = 0u;
+ tmpLineLayout.length = 0.f;
+ tmpLineLayout.widthAdvanceDiff = 0.f;
+ tmpLineLayout.wsLengthEndOfLine = 0.f;
+ tmpLineLayout.ascender = 0.f;
+ tmpLineLayout.descender = 0.f;
+
+ FontId lastFontId = 0u;
+ for( GlyphIndex glyphIndex = lineLayout.glyphIndex;
+ glyphIndex < parameters.totalNumberOfGlyphs;
+ ++glyphIndex )
{
- SingleLineLayout( boundingBox, visualModel );
- }
- else
- {
- MultiLineLayout( boundingBox, visualModel );
+ // Get the glyph info.
+ const GlyphInfo& glyphInfo = *( parameters.glyphsBuffer + glyphIndex );
+
+ // Get the character indices for the current glyph. The last character index is needed
+ // because there are glyphs formed by more than one character but their break info is
+ // given only for the last character.
+ const Length charactersPerGlyph = *( parameters.charactersPerGlyphBuffer + glyphIndex );
+ const CharacterIndex characterFirstIndex = *( parameters.glyphsToCharactersBuffer + glyphIndex );
+ const CharacterIndex characterLastIndex = characterFirstIndex + ( ( 1u > charactersPerGlyph ) ? 0u : charactersPerGlyph - 1u );
+
+ // Get the line break info for the current character.
+ const LineBreakInfo lineBreakInfo = *( parameters.lineBreakInfoBuffer + characterLastIndex );
+
+ // Get the word break info for the current character.
+ const WordBreakInfo wordBreakInfo = *( parameters.wordBreakInfoBuffer + characterLastIndex );
+
+ // Increase the number of characters.
+ tmpLineLayout.numberOfCharacters += charactersPerGlyph;
+
+ // Increase the number of glyphs.
+ tmpLineLayout.numberOfGlyphs++;
+
+ // Check whether is a white space.
+ const Character character = *( parameters.textBuffer + characterFirstIndex );
+ const bool isWhiteSpace = TextAbstraction::IsWhiteSpace( character );
+
+ // Increase the accumulated length.
+ if( isWhiteSpace )
+ {
+ // Add the length to the length of white spaces at the end of the line.
+ tmpLineLayout.wsLengthEndOfLine += glyphInfo.advance; // I use the advance as the width is always zero for the white spaces.
+ tmpLineLayout.widthAdvanceDiff = 0.f;
+ }
+ else
+ {
+ // Add as well any previous white space length.
+ tmpLineLayout.length += tmpLineLayout.wsLengthEndOfLine + glyphInfo.advance;
+ tmpLineLayout.widthAdvanceDiff = glyphInfo.width - glyphInfo.advance;
+
+ // Clear the white space length at the end of the line.
+ tmpLineLayout.wsLengthEndOfLine = 0.f;
+ }
+
+ // Check if the accumulated length fits in the width of the box.
+ if( lineLayout.length + tmpLineLayout.length + tmpLineLayout.widthAdvanceDiff + ( ( 0.f < tmpLineLayout.length ) ? lineLayout.wsLengthEndOfLine : 0.f ) > parameters.boundingBox.width )
+ {
+ // Current word does not fit in the box's width.
+ return;
+ }
+
+ if( TextAbstraction::LINE_MUST_BREAK == lineBreakInfo )
+ {
+ // Must break the line. Update the line layout and return.
+ lineLayout.numberOfCharacters += tmpLineLayout.numberOfCharacters;
+ lineLayout.numberOfGlyphs += tmpLineLayout.numberOfGlyphs;
+ lineLayout.length += tmpLineLayout.length;
+ lineLayout.widthAdvanceDiff = tmpLineLayout.widthAdvanceDiff;
+
+ if( 0.f < tmpLineLayout.length )
+ {
+ lineLayout.length += lineLayout.wsLengthEndOfLine;
+
+ lineLayout.wsLengthEndOfLine = tmpLineLayout.wsLengthEndOfLine;
+ }
+ else
+ {
+ lineLayout.wsLengthEndOfLine += tmpLineLayout.wsLengthEndOfLine;
+ }
+
+ if( tmpLineLayout.ascender > lineLayout.ascender )
+ {
+ lineLayout.ascender = tmpLineLayout.ascender;
+ }
+
+ if( tmpLineLayout.descender > lineLayout.descender )
+ {
+ lineLayout.descender = tmpLineLayout.descender;
+ }
+
+ tmpLineLayout.numberOfCharacters = 0u;
+ tmpLineLayout.numberOfGlyphs = 0u;
+ tmpLineLayout.length = 0u;
+ tmpLineLayout.widthAdvanceDiff = 0u;
+ tmpLineLayout.wsLengthEndOfLine = 0u;
+ tmpLineLayout.ascender = 0.f;
+ tmpLineLayout.descender = 0.f;
+ return;
+ }
+
+ if( TextAbstraction::WORD_BREAK == wordBreakInfo )
+ {
+ // Current glyph is the last one of the current word.
+ // Add the temporal layout to the current one.
+ lineLayout.numberOfCharacters += tmpLineLayout.numberOfCharacters;
+ lineLayout.numberOfGlyphs += tmpLineLayout.numberOfGlyphs;
+ lineLayout.length += tmpLineLayout.length;
+ lineLayout.widthAdvanceDiff = tmpLineLayout.widthAdvanceDiff;
+
+ if( 0.f < tmpLineLayout.length )
+ {
+ lineLayout.length += lineLayout.wsLengthEndOfLine;
+
+ lineLayout.wsLengthEndOfLine = tmpLineLayout.wsLengthEndOfLine;
+ }
+ else
+ {
+ lineLayout.wsLengthEndOfLine += tmpLineLayout.wsLengthEndOfLine;
+ }
+
+ if( tmpLineLayout.ascender > lineLayout.ascender )
+ {
+ lineLayout.ascender = tmpLineLayout.ascender;
+ }
+
+ if( tmpLineLayout.descender > lineLayout.descender )
+ {
+ lineLayout.descender = tmpLineLayout.descender;
+ }
+
+ tmpLineLayout.numberOfCharacters = 0u;
+ tmpLineLayout.numberOfGlyphs = 0u;
+ tmpLineLayout.length = 0u;
+ tmpLineLayout.widthAdvanceDiff = 0u;
+ tmpLineLayout.wsLengthEndOfLine = 0u;
+ tmpLineLayout.ascender = 0.f;
+ tmpLineLayout.descender = 0.f;
+ }
+
+ if( lastFontId != glyphInfo.fontId )
+ {
+ Text::FontMetrics fontMetrics;
+ mFontClient.GetFontMetrics( glyphInfo.fontId, fontMetrics );
+
+ // Sets the maximum ascender.
+ if( fontMetrics.ascender > tmpLineLayout.ascender )
+ {
+ tmpLineLayout.ascender = fontMetrics.ascender;
+ }
+
+ // Sets the maximum descender.
+ if( -fontMetrics.descender > tmpLineLayout.descender )
+ {
+ tmpLineLayout.descender = -fontMetrics.descender;
+ }
+
+ lastFontId = glyphInfo.fontId;
+ }
}
}
- // TODO - Rewrite this to handle bidi
- void SingleLineLayout( const Vector2& boundingBox, VisualModel& visualModel )
+ bool LayoutText( const LayoutParameters& layoutParameters,
+ Vector<Vector2>& glyphPositions,
+ Vector<LineRun>& lines,
+ Size& actualSize )
{
- Length glyphCount = visualModel.GetNumberOfGlyphs();
+ // TODO Switch between different layouts
+ bool update = false;
- std::vector<Vector2> glyphPositions;
- glyphPositions.reserve( glyphCount );
+ switch( mLayout )
+ {
+ case LayoutEngine::SINGLE_LINE_BOX:
+ {
+ update = SingleLineLayout( layoutParameters,
+ glyphPositions,
+ lines,
+ actualSize );
+ break;
+ }
+ case LayoutEngine::MULTI_LINE_BOX:
+ {
+ update = MultiLineLayout( layoutParameters,
+ glyphPositions,
+ lines,
+ actualSize );
+ break;
+ }
+ default:
+ break;
+ }
- if( glyphCount > 0 )
+ return update;
+ }
+
+ void ReLayoutRightToLeftLines( const LayoutParameters& layoutParameters,
+ Vector<Vector2>& glyphPositions )
+ {
+ // Traverses the paragraphs with right to left characters.
+ for( LineIndex lineIndex = 0u; lineIndex < layoutParameters.numberOfBidirectionalInfoRuns; ++lineIndex )
{
- // FIXME Single font assumption
- Text::FontMetrics fontMetrics;
- GlyphInfo firstGlyph;
- visualModel.GetGlyphs( &firstGlyph, 0, 1 );
- mFontClient.GetFontMetrics( firstGlyph.fontId, fontMetrics );
+ const BidirectionalLineInfoRun& bidiLine = *( layoutParameters.lineBidirectionalInfoRunsBuffer + lineIndex );
- float penX( 0 );
- float penY( fontMetrics.ascender ); // Move to baseline
+ float penX = 0.f;
- for( unsigned int i=0; i<glyphCount; ++i )
+ Vector2* glyphPositionsBuffer = glyphPositions.Begin();
+
+ // Traverses the characters of the right to left paragraph.
+ for( CharacterIndex characterLogicalIndex = 0u;
+ characterLogicalIndex < bidiLine.characterRun.numberOfCharacters;
+ ++characterLogicalIndex )
{
- GlyphInfo glyph;
- visualModel.GetGlyphs( &glyph, i, 1 );
+ // Convert the character in the logical order into the character in the visual order.
+ const CharacterIndex characterVisualIndex = bidiLine.characterRun.characterIndex + *( bidiLine.visualToLogicalMap + characterLogicalIndex );
- glyphPositions.push_back( Vector2( penX + glyph.xBearing,
- penY - glyph.yBearing ) );
+ // Get the number of glyphs of the character.
+ const Length numberOfGlyphs = *( layoutParameters.glyphsPerCharacterBuffer + characterVisualIndex );
- penX += glyph.advance;
- }
+ for( GlyphIndex index = 0u; index < numberOfGlyphs; ++index )
+ {
+ // Convert the character in the visual order into the glyph in the visual order.
+ const GlyphIndex glyphIndex = *( layoutParameters.charactersToGlyphsBuffer + characterVisualIndex ) + index;
+
+ DALI_ASSERT_DEBUG( 0u <= glyphIndex && glyphIndex < layoutParameters.totalNumberOfGlyphs );
- visualModel.SetGlyphPositions( &glyphPositions[0], glyphCount );
+ const GlyphInfo& glyph = *( layoutParameters.glyphsBuffer + glyphIndex );
+ Vector2& position = *( glyphPositionsBuffer + glyphIndex );
- visualModel.SetActualSize( Vector2(penX, fontMetrics.height) );
+ position.x = penX + glyph.xBearing;
+ penX += glyph.advance;
+ }
+ }
}
}
- // TODO - Rewrite this to handle bidi
- void MultiLineLayout( const Vector2& boundingBox, VisualModel& visualModel )
+ void Align( const LayoutParameters& layoutParameters,
+ const Size& layoutSize,
+ const Vector<LineRun>& lines,
+ Vector<Vector2>& glyphPositions )
{
- Length glyphCount = visualModel.GetNumberOfGlyphs();
+ Vector2* glyphPositionsBuffer = glyphPositions.Begin();
- std::vector<Vector2> glyphPositions;
- glyphPositions.reserve( glyphCount );
+ // Traverse all lines and align the glyphs.
+ // LayoutParameters contains bidirectional info for those lines with
+ // right to left text, this info includes the paragraph's direction.
- if( glyphCount > 0 )
+ LineIndex bidiLineIndex = 0u;
+ for( Vector<LineRun>::ConstIterator it = lines.Begin(), endIt = lines.End();
+ it != endIt;
+ ++it )
{
- Size actualSize;
-
- // FIXME Single font assumption
- Text::FontMetrics fontMetrics;
- GlyphInfo firstGlyph;
- visualModel.GetGlyphs( &firstGlyph, 0, 1 );
- mFontClient.GetFontMetrics( firstGlyph.fontId, fontMetrics );
+ const LineRun& line = *it;
- float penX( 0 );
- float penY( fontMetrics.ascender ); // Move to baseline
+ // 1) Get the paragrap's direction.
+ bool paragraphDirection = false;
- unsigned int i=0;
- while( i < glyphCount )
+ // Check if there is any right to left line.
+ if( ( NULL != layoutParameters.lineBidirectionalInfoRunsBuffer ) &&
+ ( bidiLineIndex < layoutParameters.numberOfBidirectionalInfoRuns ) )
{
- // Skip initial whitespace
- for( ; i<glyphCount; ++i )
+ const BidirectionalLineInfoRun* bidiLine = layoutParameters.lineBidirectionalInfoRunsBuffer + bidiLineIndex;
+
+ // Get the right to left line that match with current line.
+ while( ( line.characterRun.characterIndex > bidiLine->characterRun.characterIndex ) &&
+ ( bidiLineIndex < layoutParameters.numberOfBidirectionalInfoRuns ) )
{
- GlyphInfo glyph;
- visualModel.GetGlyphs( &glyph, i, 1 );
-
- if( glyph.width > 0 &&
- glyph.height > 0 )
- {
- break;
- }
- else
- {
- glyphPositions.push_back( Vector2( penX + glyph.xBearing,
- penY - glyph.yBearing ) );
- }
+ ++bidiLineIndex;
+ bidiLine = layoutParameters.lineBidirectionalInfoRunsBuffer + bidiLineIndex;
}
- // Find last glyph for the next line
- unsigned int endIndex = i;
- float endPenX = penX;
- unsigned int j=i;
- for( ; j<glyphCount; ++j )
+ if( line.characterRun.characterIndex == bidiLine->characterRun.characterIndex )
{
- GlyphInfo glyph;
- visualModel.GetGlyphs( &glyph, j, 1 );
-
- endPenX += glyph.advance;
-
- if( glyph.width <= 0 ||
- glyph.height <= 0 )
- {
- // Potential line end found
- endIndex = j;
- }
- else if( endPenX > boundingBox.width )
- {
- break;
- }
+ paragraphDirection = bidiLine->direction;
}
+ }
- actualSize.width = ( actualSize.width < endPenX ) ? endPenX : actualSize.width;
+ // 2) Calculate the alignment offset accordingly with the align option,
+ // the box width, line length, and the paragraphs direction.
+ float alignOffset = CalculateHorizontalAlignment( layoutSize.width,
+ line.lineSize.width,
+ line.extraLength,
+ paragraphDirection );
+
+ // 3) Traverse all glyphs and update the 'x' position.
+ for( GlyphIndex index = line.glyphIndex,
+ endIndex = line.glyphIndex + line.numberOfGlyphs;
+ index < endIndex;
+ ++index )
+ {
+ Vector2& position = *( glyphPositionsBuffer + index );
- // If end of text or no whitespace found
- if( glyphCount == j ||
- endIndex == i )
- {
- endIndex = j;
- }
+ position.x += alignOffset;
+ }
+ }
+ }
- for( ; i<endIndex; ++i )
- {
- GlyphInfo glyph;
- visualModel.GetGlyphs( &glyph, i, 1 );
+ bool SingleLineLayout( const LayoutParameters& layoutParameters,
+ Vector<Vector2>& glyphPositions,
+ Vector<LineRun>& lines,
+ Size& actualSize )
+ {
+ LineLayout layout;
+ layout.glyphIndex = 0u;
+ GetLineLayoutForBox( layoutParameters,
+ layout );
+
+ // Create a line run and add it to the lines.
+ const GlyphIndex lastGlyphIndex = layoutParameters.totalNumberOfGlyphs - 1u;
+
+ LineRun lineRun;
+ lineRun.glyphIndex = 0u;
+ lineRun.numberOfGlyphs = layoutParameters.totalNumberOfGlyphs;
+ lineRun.characterRun.characterIndex = 0u;
+ lineRun.characterRun.numberOfCharacters = *( layoutParameters.glyphsToCharactersBuffer + lastGlyphIndex ) + *( layoutParameters.charactersPerGlyphBuffer + lastGlyphIndex );
+ lineRun.lineSize.width = layout.length;
+ lineRun.lineSize.height = layout.ascender + layout.descender;
+ lineRun.extraLength = layout.wsLengthEndOfLine;
+
+ lines.PushBack( lineRun );
+
+ // Update the actual size.
+ actualSize.width = layout.length;
+ actualSize.height = lineRun.lineSize.height;
+
+ float penX = 0.f;
+ float penY = layout.ascender;
+
+ Vector2* glyphPositionsBuffer = glyphPositions.Begin();
+ for( GlyphIndex glyphIndex = 0u; glyphIndex < layout.numberOfGlyphs; ++glyphIndex )
+ {
+ const GlyphInfo& glyph = *( layoutParameters.glyphsBuffer + glyphIndex );
+ Vector2& position = *( glyphPositionsBuffer + glyphIndex );
- glyphPositions.push_back( Vector2( penX + glyph.xBearing,
- penY - glyph.yBearing ) );
+ position.x = penX + glyph.xBearing;
+ position.y = penY - glyph.yBearing;
- penX += glyph.advance;
- }
+ penX += glyph.advance;
+ }
+
+ return true;
+ }
+
+ bool MultiLineLayout( const LayoutParameters& layoutParameters,
+ Vector<Vector2>& glyphPositions,
+ Vector<LineRun>& lines,
+ Size& actualSize )
+ {
+ float penY = 0.f;
+ for( GlyphIndex index = 0u; index < layoutParameters.totalNumberOfGlyphs; )
+ {
+ float penX = 0.f;
+
+ // Get the layout for the line.
+ LineLayout layout;
+ layout.glyphIndex = index;
+ GetMultiLineLayoutForBox( layoutParameters,
+ layout );
+
+ if( 0u == layout.numberOfGlyphs )
+ {
+ // The width is too small and no characters are laid-out.
+ return false;
+ }
+
+ // Create a line run and add it to the lines.
+ const GlyphIndex lastGlyphIndex = index + layout.numberOfGlyphs - 1u;
+
+ LineRun lineRun;
+ lineRun.glyphIndex = index;
+ lineRun.numberOfGlyphs = layout.numberOfGlyphs;
+ lineRun.characterRun.characterIndex = *( layoutParameters.glyphsToCharactersBuffer + index );
+ lineRun.characterRun.numberOfCharacters = ( *( layoutParameters.glyphsToCharactersBuffer + lastGlyphIndex ) + *( layoutParameters.charactersPerGlyphBuffer + lastGlyphIndex ) ) - lineRun.characterRun.characterIndex;
+ lineRun.lineSize.width = layout.length + ( ( layout.widthAdvanceDiff > 0.f ) ? layout.widthAdvanceDiff : 0.f );
+ lineRun.lineSize.height = layout.ascender + layout.descender;
+ lineRun.extraLength = layout.wsLengthEndOfLine;
+
+ lines.PushBack( lineRun );
+
+ // Update the actual size.
+ if( layout.length + layout.widthAdvanceDiff > actualSize.width )
+ {
+ actualSize.width = layout.length;
+ }
+
+ actualSize.height += lineRun.lineSize.height;
+
+ // Traverse the glyphs and set the positions.
+
+ penY += layout.ascender;
+
+ Vector2* glyphPositionsBuffer = glyphPositions.Begin();
+ for( GlyphIndex i = index; i < index + layout.numberOfGlyphs; ++i )
+ {
+ const GlyphInfo& glyph = *( layoutParameters.glyphsBuffer + i );
+ Vector2& position = *( glyphPositionsBuffer + i );
- // Go to next line
- penX = 0;
- penY += fontMetrics.height;
+ position.x = penX + glyph.xBearing;
+ position.y = penY - glyph.yBearing;
- actualSize.height += fontMetrics.height;
+ penX += glyph.advance;
}
- visualModel.SetGlyphPositions( &glyphPositions[0], glyphCount );
+ penY += layout.descender;
- visualModel.SetActualSize( actualSize );
+ // Increase the glyph index.
+ index += layout.numberOfGlyphs;
}
+
+ return true;
}
- unsigned int mLayout;
+ float CalculateHorizontalAlignment( float boxWidth,
+ float lineLength,
+ float extraLength,
+ bool paragraphDirection )
+ {
+ float offset = 0.f;
+
+ HorizontalAlignment alignment = mHorizontalAlignment;
+ if( paragraphDirection &&
+ ( HORIZONTAL_ALIGN_CENTER != alignment ) )
+ {
+ if( HORIZONTAL_ALIGN_BEGIN == alignment )
+ {
+ alignment = HORIZONTAL_ALIGN_END;
+ }
+ else
+ {
+ alignment = HORIZONTAL_ALIGN_BEGIN;
+ }
+ }
+
+ switch( alignment )
+ {
+ case HORIZONTAL_ALIGN_BEGIN:
+ {
+ offset = 0.f;
+ break;
+ }
+ case HORIZONTAL_ALIGN_CENTER:
+ {
+ offset = 0.5f * ( boxWidth - lineLength );
+ const int intOffset = static_cast<int>( offset ); // try to avoid pixel alignment.
+ offset = static_cast<float>( intOffset );
+ break;
+ }
+ case HORIZONTAL_ALIGN_END:
+ {
+ offset = boxWidth - lineLength;
+ break;
+ }
+ }
+
+ if( paragraphDirection )
+ {
+ offset -= extraLength;
+ }
+
+ return offset;
+ }
+
+ LayoutEngine::Layout mLayout;
+ LayoutEngine::HorizontalAlignment mHorizontalAlignment;
+ LayoutEngine::VerticalAlignment mVerticalAlignment;
TextAbstraction::FontClient mFontClient;
};
return mImpl->mLayout;
}
-void LayoutEngine::UpdateVisualModel( const Vector2& boundingBox,
- const Vector<GlyphInfo>& glyphs,
- const Vector<CharacterIndex>& characterIndices,
- const Vector<Length>& charactersPerGlyph,
- VisualModel& visualModel )
-{
- mImpl->UpdateVisualModel( boundingBox,
- glyphs,
- characterIndices,
- charactersPerGlyph,
- visualModel );
+void LayoutEngine::SetHorizontalAlignment( HorizontalAlignment alignment )
+{
+ mImpl->mHorizontalAlignment = alignment;
+}
+
+LayoutEngine::HorizontalAlignment LayoutEngine::GetHorizontalAlignment() const
+{
+ return mImpl->mHorizontalAlignment;
+}
+
+void LayoutEngine::SetVerticalAlignment( VerticalAlignment alignment )
+{
+ mImpl->mVerticalAlignment = alignment;
+}
+
+LayoutEngine::VerticalAlignment LayoutEngine::GetVerticalAlignment() const
+{
+ return mImpl->mVerticalAlignment;
+}
+
+bool LayoutEngine::LayoutText( const LayoutParameters& layoutParameters,
+ Vector<Vector2>& glyphPositions,
+ Vector<LineRun>& lines,
+ Size& actualSize )
+{
+ return mImpl->LayoutText( layoutParameters,
+ glyphPositions,
+ lines,
+ actualSize );
+}
+
+void LayoutEngine::ReLayoutRightToLeftLines( const LayoutParameters& layoutParameters,
+ Vector<Vector2>& glyphPositions )
+{
+ mImpl->ReLayoutRightToLeftLines( layoutParameters,
+ glyphPositions );
+}
+
+void LayoutEngine::Align( const LayoutParameters& layoutParameters,
+ const Size& layoutSize,
+ const Vector<LineRun>& lines,
+ Vector<Vector2>& glyphPositions )
+{
+ mImpl->Align( layoutParameters,
+ layoutSize,
+ lines,
+ glyphPositions );
}
} // namespace Text
projects / platform / core / uifw / dali-toolkit.git / blobdiff