#include <dali-toolkit/internal/text/layouts/layout-engine.h>
// EXTERNAL INCLUDES
+#include <limits>
#include <dali/public-api/math/vector2.h>
-#include <dali/public-api/text-abstraction/font-client.h>
+#include <dali/devel-api/text-abstraction/font-client.h>
+#include <dali/integration-api/debug.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
{
+namespace
+{
+
+#if defined(DEBUG_ENABLED)
+ Debug::Filter* gLogFilter = Debug::Filter::New(Debug::Concise, true, "LOG_TEXT_LAYOUT");
+#endif
+
+const float MAX_FLOAT = std::numeric_limits<float>::max();
+const bool RTL = true;
+
+} //namespace
+
+/**
+ * @brief Stores temporary layout info of the line.
+ */
+struct LineLayout
+{
+ LineLayout()
+ : glyphIndex( 0u ),
+ characterIndex( 0u ),
+ numberOfGlyphs( 0u ),
+ numberOfCharacters( 0u ),
+ length( 0.f ),
+ widthAdvanceDiff( 0.f ),
+ wsLengthEndOfLine( 0.f ),
+ ascender( 0.f ),
+ descender( MAX_FLOAT )
+ {}
+
+ ~LineLayout()
+ {}
+
+ void Clear()
+ {
+ glyphIndex = 0u;
+ characterIndex = 0u;
+ numberOfGlyphs = 0u;
+ numberOfCharacters = 0u;
+ length = 0.f;
+ widthAdvanceDiff = 0.f;
+ wsLengthEndOfLine = 0.f;
+ ascender = 0.f;
+ descender = MAX_FLOAT;
+ }
+
+ GlyphIndex glyphIndex; ///< Index of the first glyph to be laid-out.
+ CharacterIndex characterIndex; ///< Index of the first character to be laid-out.
+ Length numberOfGlyphs; ///< The number of glyph which fit in one line.
+ Length numberOfCharacters; ///< The number of characters which fit in one line.
+ float length; ///< The length of the glyphs which fit in one line.
+ float widthAdvanceDiff; ///< The difference between the xBearing + 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 minimum 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 ),
+ mEllipsisEnabled( false )
{
mFontClient = TextAbstraction::FontClient::Get();
}
- void UpdateVisualModel( const Vector2& boundingBox,
- const Vector<GlyphInfo>& glyphs,
- const Vector<CharacterIndex>& characterIndices,
- const Vector<Length>& charactersPerGlyph,
- VisualModel& visualModel )
+ /**
+ * @brief Updates the line ascender and descender with the metrics of a new font.
+ *
+ * @param[in] fontId The id of the new font.
+ * @param[in,out] lineLayout The line layout.
+ */
+ void UpdateLineHeight( FontId fontId, LineLayout& lineLayout )
{
- // TODO Switch between different layouts
+ Text::FontMetrics fontMetrics;
+ mFontClient.GetFontMetrics( fontId, fontMetrics );
- visualModel.SetGlyphs( &glyphs[0],
- &characterIndices[0],
- &charactersPerGlyph[0],
- glyphs.Count() );
+ // Sets the maximum ascender.
+ if( fontMetrics.ascender > lineLayout.ascender )
+ {
+ lineLayout.ascender = fontMetrics.ascender;
+ }
- UpdateGlyphPositions( boundingBox, visualModel );
+ // Sets the minimum descender.
+ if( fontMetrics.descender < lineLayout.descender )
+ {
+ lineLayout.descender = fontMetrics.descender;
+ }
}
- void UpdateGlyphPositions( const Vector2& boundingBox, VisualModel& visualModel )
+ /**
+ * @brief Merges a temporary line layout into the line layout.
+ *
+ * @param[in,out] lineLayout The line layout.
+ * @param[in] tmpLineLayout A temporary line layout.
+ */
+ void MergeLineLayout( LineLayout& lineLayout,
+ const LineLayout& tmpLineLayout )
{
- if( LayoutEngine::SINGLE_LINE_BOX == mLayout )
+ lineLayout.numberOfCharacters += tmpLineLayout.numberOfCharacters;
+ lineLayout.numberOfGlyphs += tmpLineLayout.numberOfGlyphs;
+ lineLayout.length += tmpLineLayout.length;
+
+ if( 0.f < tmpLineLayout.length )
{
- SingleLineLayout( boundingBox, visualModel );
+ lineLayout.length += lineLayout.wsLengthEndOfLine;
+
+ lineLayout.wsLengthEndOfLine = tmpLineLayout.wsLengthEndOfLine;
+ lineLayout.widthAdvanceDiff = tmpLineLayout.widthAdvanceDiff;
}
else
{
- MultiLineLayout( boundingBox, visualModel );
+ lineLayout.wsLengthEndOfLine += tmpLineLayout.wsLengthEndOfLine;
+ }
+
+ if( tmpLineLayout.ascender > lineLayout.ascender )
+ {
+ lineLayout.ascender = tmpLineLayout.ascender;
+ }
+
+ if( tmpLineLayout.descender < lineLayout.descender )
+ {
+ lineLayout.descender = tmpLineLayout.descender;
}
}
- // TODO - Rewrite this to handle bidi
- void SingleLineLayout( const Vector2& boundingBox, VisualModel& visualModel )
+ /**
+ * Retrieves the line layout for a given box width.
+ *
+ * @param[in] parameters The layout parameters.
+ * @param[out] lineLayout The line layout.
+ * @param[in] completelyFill Whether to completely fill the line ( even if the last word exceeds the boundaries ).
+ */
+ void GetLineLayoutForBox( const LayoutParameters& parameters,
+ LineLayout& lineLayout,
+ bool completelyFill )
{
- Length glyphCount = visualModel.GetNumberOfGlyphs();
+ DALI_LOG_INFO( gLogFilter, Debug::Verbose, "-->GetLineLayoutForBox\n" );
+ DALI_LOG_INFO( gLogFilter, Debug::Verbose, " initial glyph index : %d\n", lineLayout.glyphIndex );
+ // Stores temporary line layout which has not been added to the final line layout.
+ LineLayout tmpLineLayout;
+
+ const bool isMultiline = mLayout == MULTI_LINE_BOX;
+ const GlyphIndex lastGlyphIndex = parameters.totalNumberOfGlyphs - 1u;
+
+ // If the first glyph has a negative bearing its absolute value needs to be added to the line length.
+ // In the case the line starts with a right to left character the bearing needs to be substracted to the line length.
+ const GlyphInfo& glyphInfo = *( parameters.glyphsBuffer + lineLayout.glyphIndex );
+ float initialHorizontalBearing = glyphInfo.xBearing;
+
+ lineLayout.characterIndex = *( parameters.glyphsToCharactersBuffer + lineLayout.glyphIndex );
+ const CharacterDirection firstCharacterDirection = ( NULL == parameters.characterDirectionBuffer ) ? false : *( parameters.characterDirectionBuffer + lineLayout.characterIndex );
+
+ if( RTL == firstCharacterDirection )
+ {
+ initialHorizontalBearing = -initialHorizontalBearing;
+
+ if( 0.f < glyphInfo.xBearing )
+ {
+ tmpLineLayout.length = glyphInfo.xBearing;
+ initialHorizontalBearing = 0.f;
+ }
+ }
+ else
+ {
+ if( 0.f > glyphInfo.xBearing )
+ {
+ tmpLineLayout.length = -glyphInfo.xBearing;
+ initialHorizontalBearing = 0.f;
+ }
+ }
+
+ // Calculate the line height if there is no characters.
+ FontId lastFontId = glyphInfo.fontId;
+ UpdateLineHeight( lastFontId, tmpLineLayout );
+
+ const float boundingBoxWidth = parameters.boundingBox.width - initialHorizontalBearing;
- std::vector<Vector2> glyphPositions;
- glyphPositions.reserve( glyphCount );
+ bool oneWordLaidOut = false;
- if( glyphCount > 0 )
+ for( GlyphIndex glyphIndex = lineLayout.glyphIndex;
+ glyphIndex < parameters.totalNumberOfGlyphs;
+ ++glyphIndex )
{
- // FIXME Single font assumption
- Text::FontMetrics fontMetrics;
- GlyphInfo firstGlyph;
- visualModel.GetGlyphs( &firstGlyph, 0, 1 );
- mFontClient.GetFontMetrics( firstGlyph.fontId, fontMetrics );
+ DALI_LOG_INFO( gLogFilter, Debug::Verbose, " glyph index : %d\n", glyphIndex );
+ const bool isLastGlyph = glyphIndex == lastGlyphIndex;
+
+ // 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;
- float penX( 0 );
- float penY( fontMetrics.ascender ); // Move to baseline
+ // Increase the number of glyphs.
+ tmpLineLayout.numberOfGlyphs++;
- for( unsigned int i=0; i<glyphCount; ++i )
+ // Check whether is a white space.
+ const Character character = *( parameters.textBuffer + characterFirstIndex );
+ const bool isWhiteSpace = TextAbstraction::IsWhiteSpace( character );
+
+ // Used to restore the temporal line layout when a single word does not fit in the control's width and is split by character.
+ const float previousTmpLineLength = tmpLineLayout.length;
+ const float previousTmpWidthAdvanceDiff = tmpLineLayout.widthAdvanceDiff;
+
+ // 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; // The advance is used as the width is always zero for the white spaces.
+ }
+ else
+ {
+ // Add as well any previous white space length.
+ tmpLineLayout.length += tmpLineLayout.wsLengthEndOfLine + glyphInfo.advance;
+ if( RTL == firstCharacterDirection )
+ {
+ tmpLineLayout.widthAdvanceDiff = -glyphInfo.xBearing;
+ }
+ else
+ {
+ tmpLineLayout.widthAdvanceDiff = glyphInfo.xBearing + 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( ( completelyFill || isMultiline ) && !isWhiteSpace &&
+ ( lineLayout.length + lineLayout.wsLengthEndOfLine + tmpLineLayout.length + tmpLineLayout.widthAdvanceDiff > boundingBoxWidth ) )
{
- GlyphInfo glyph;
- visualModel.GetGlyphs( &glyph, i, 1 );
+ // Current word does not fit in the box's width.
+ if( !oneWordLaidOut || completelyFill )
+ {
+ DALI_LOG_INFO( gLogFilter, Debug::Verbose, " Break the word by character\n" );
+
+ // The word's with doesn't fit in the control's with. It needs to be split by character.
+ if( tmpLineLayout.numberOfGlyphs > 0u )
+ {
+ tmpLineLayout.numberOfCharacters -= charactersPerGlyph;
+ --tmpLineLayout.numberOfGlyphs;
+ tmpLineLayout.length = previousTmpLineLength;
+ tmpLineLayout.widthAdvanceDiff = previousTmpWidthAdvanceDiff;
+ }
- glyphPositions.push_back( Vector2( penX + glyph.xBearing,
- penY - glyph.yBearing ) );
+ // Add part of the word to the line layout.
+ MergeLineLayout( lineLayout, tmpLineLayout );
+ }
+ else
+ {
+ DALI_LOG_INFO( gLogFilter, Debug::Verbose, " Current word does not fit.\n" );
+ }
+ DALI_LOG_INFO( gLogFilter, Debug::Verbose, "<--GetLineLayoutForBox\n" );
+ return;
+ }
+
+ if( ( isMultiline || isLastGlyph ) &&
+ ( TextAbstraction::LINE_MUST_BREAK == lineBreakInfo ) )
+ {
+ // Must break the line. Update the line layout and return.
+ MergeLineLayout( lineLayout, tmpLineLayout );
- penX += glyph.advance;
+ DALI_LOG_INFO( gLogFilter, Debug::Verbose, " Must break\n" );
+ DALI_LOG_INFO( gLogFilter, Debug::Verbose, "<--GetLineLayoutForBox\n" );
+ return;
}
- visualModel.SetGlyphPositions( &glyphPositions[0], glyphCount );
+ if( isMultiline &&
+ ( TextAbstraction::WORD_BREAK == wordBreakInfo ) )
+ {
+ oneWordLaidOut = true;
+ DALI_LOG_INFO( gLogFilter, Debug::Verbose, " One word laid out\n" );
+
+ // Current glyph is the last one of the current word.
+ // Add the temporal layout to the current one.
+ MergeLineLayout( lineLayout, tmpLineLayout );
+
+ tmpLineLayout.Clear();
+ }
- visualModel.SetActualSize( Vector2(penX, fontMetrics.height) );
+ // Check if the font of the current glyph is the same of the previous one.
+ // If it's different the ascender and descender need to be updated.
+ if( lastFontId != glyphInfo.fontId )
+ {
+ UpdateLineHeight( glyphInfo.fontId, tmpLineLayout );
+ lastFontId = glyphInfo.fontId;
+ }
}
+ DALI_LOG_INFO( gLogFilter, Debug::Verbose, "<--GetLineLayoutForBox\n" );
}
- // TODO - Rewrite this to handle bidi
- void MultiLineLayout( const Vector2& boundingBox, VisualModel& visualModel )
+ void SetGlyphPositions( const GlyphInfo* const glyphsBuffer,
+ Length numberOfGlyphs,
+ float penY,
+ Vector2* glyphPositionsBuffer )
{
- Length glyphCount = visualModel.GetNumberOfGlyphs();
+ // Traverse the glyphs and set the positions.
- std::vector<Vector2> glyphPositions;
- glyphPositions.reserve( glyphCount );
+ // Check if the x bearing of the first character is negative.
+ // If it has a negative x bearing, it will exceed the boundaries of the actor,
+ // so the penX position needs to be moved to the right.
+ float penX = 0.f;
- if( glyphCount > 0 )
+ const GlyphInfo& glyph = *glyphsBuffer;
+ if( 0.f > glyph.xBearing )
{
- Size actualSize;
+ penX = -glyph.xBearing;
+ }
+
+ for( GlyphIndex i = 0u; i < numberOfGlyphs; ++i )
+ {
+ const GlyphInfo& glyph = *( glyphsBuffer + i );
+ Vector2& position = *( glyphPositionsBuffer + i );
- // FIXME Single font assumption
- Text::FontMetrics fontMetrics;
- GlyphInfo firstGlyph;
- visualModel.GetGlyphs( &firstGlyph, 0, 1 );
- mFontClient.GetFontMetrics( firstGlyph.fontId, fontMetrics );
+ position.x = penX + glyph.xBearing;
+ position.y = penY - glyph.yBearing;
+
+ penX += glyph.advance;
+ }
+ }
- float penX( 0 );
- float penY( fontMetrics.ascender ); // Move to baseline
+ bool LayoutText( const LayoutParameters& layoutParameters,
+ Vector<Vector2>& glyphPositions,
+ Vector<LineRun>& lines,
+ Size& actualSize )
+ {
+ DALI_LOG_INFO( gLogFilter, Debug::Verbose, "-->LayoutText\n" );
+ DALI_LOG_INFO( gLogFilter, Debug::Verbose, " box size %f, %f\n", layoutParameters.boundingBox.width, layoutParameters.boundingBox.height );
- unsigned int i=0;
- while( i < glyphCount )
+ float penY = 0.f;
+ for( GlyphIndex index = 0u; index < layoutParameters.totalNumberOfGlyphs; )
+ {
+ // Get the layout for the line.
+ LineLayout layout;
+ layout.glyphIndex = index;
+ GetLineLayoutForBox( layoutParameters,
+ layout,
+ false );
+
+ DALI_LOG_INFO( gLogFilter, Debug::Verbose, " glyph index %d\n", layout.glyphIndex );
+ DALI_LOG_INFO( gLogFilter, Debug::Verbose, " character index %d\n", layout.characterIndex );
+ DALI_LOG_INFO( gLogFilter, Debug::Verbose, " number of glyphs %d\n", layout.numberOfGlyphs );
+ DALI_LOG_INFO( gLogFilter, Debug::Verbose, " number of characters %d\n", layout.numberOfCharacters );
+ DALI_LOG_INFO( gLogFilter, Debug::Verbose, " length %f\n", layout.length );
+
+ if( 0u == layout.numberOfGlyphs )
{
- // Skip initial whitespace
- for( ; i<glyphCount; ++i )
- {
- GlyphInfo glyph;
- visualModel.GetGlyphs( &glyph, i, 1 );
+ // The width is too small and no characters are laid-out.
+ DALI_LOG_INFO( gLogFilter, Debug::Verbose, "<--LayoutText width too small!\n\n" );
+ return false;
+ }
- if( glyph.width > 0 &&
- glyph.height > 0 )
- {
- break;
- }
- else
- {
- glyphPositions.push_back( Vector2( penX + glyph.xBearing,
- penY - glyph.yBearing ) );
- }
- }
+ // Set the line position. Discard if ellipsis is enabled and the position exceeds the boundaries
+ // of the box.
+ penY += layout.ascender;
+
+ DALI_LOG_INFO( gLogFilter, Debug::Verbose, " pen y %f\n", penY );
+ if( mEllipsisEnabled &&
+ ( ( penY - layout.descender > layoutParameters.boundingBox.height ) ||
+ ( ( mLayout == SINGLE_LINE_BOX ) &&
+ ( layout.length + layout.widthAdvanceDiff > layoutParameters.boundingBox.width ) ) ) )
+ {
+ // Do not layout more lines if ellipsis is enabled.
+
+ // The last line needs to be completely filled with characters.
+ // Part of a word may be used.
+
+ const Length numberOfLines = lines.Count();
- // Find last glyph for the next line
- unsigned int endIndex = i;
- float endPenX = penX;
- unsigned int j=i;
- for( ; j<glyphCount; ++j )
+ LineRun lineRun;
+ LineLayout ellipsisLayout;
+ if( 0u != numberOfLines )
{
- GlyphInfo glyph;
- visualModel.GetGlyphs( &glyph, j, 1 );
+ // Get the last line and layout it again with the 'completelyFill' flag to true.
+ lineRun = *( lines.Begin() + ( numberOfLines - 1u ) );
- endPenX += glyph.advance;
+ penY -= layout.ascender - lineRun.descender;
- if( glyph.width <= 0 ||
- glyph.height <= 0 )
- {
- // Potential line end found
- endIndex = j;
- }
- else if( endPenX > boundingBox.width )
- {
- break;
- }
+ ellipsisLayout.glyphIndex = lineRun.glyphIndex;
+ }
+ else
+ {
+ lineRun.glyphIndex = 0u;
+ ellipsisLayout.glyphIndex = 0u;
}
- actualSize.width = ( actualSize.width < endPenX ) ? endPenX : actualSize.width;
+ GetLineLayoutForBox( layoutParameters,
+ ellipsisLayout,
+ true );
+
+ lineRun.numberOfGlyphs = ellipsisLayout.numberOfGlyphs;
+ lineRun.characterRun.characterIndex = ellipsisLayout.characterIndex;
+ lineRun.characterRun.numberOfCharacters = ellipsisLayout.numberOfCharacters;
+ lineRun.width = layoutParameters.boundingBox.width;
+ lineRun.ascender = ellipsisLayout.ascender;
+ lineRun.descender = ellipsisLayout.descender;
+ lineRun.extraLength = ellipsisLayout.wsLengthEndOfLine > 0.f ? ellipsisLayout.wsLengthEndOfLine - ellipsisLayout.widthAdvanceDiff : 0.f;
+ lineRun.ellipsis = true;
+
+ actualSize.width = layoutParameters.boundingBox.width;
+ actualSize.height += ( lineRun.ascender + -lineRun.descender );
+
+ SetGlyphPositions( layoutParameters.glyphsBuffer + lineRun.glyphIndex,
+ ellipsisLayout.numberOfGlyphs,
+ penY,
+ glyphPositions.Begin() + lineRun.glyphIndex );
- // If end of text or no whitespace found
- if( glyphCount == j ||
- endIndex == i )
+ if( 0u != numberOfLines )
{
- endIndex = j;
+ // Set the last line with the ellipsis layout.
+ *( lines.Begin() + ( numberOfLines - 1u ) ) = lineRun;
+ }
+ else
+ {
+ // Push the line.
+ lines.PushBack( lineRun );
}
- for( ; i<endIndex; ++i )
+ break;
+ }
+ else
+ {
+ LineRun lineRun;
+ lineRun.glyphIndex = index;
+ lineRun.numberOfGlyphs = layout.numberOfGlyphs;
+ lineRun.characterRun.characterIndex = layout.characterIndex;
+ lineRun.characterRun.numberOfCharacters = layout.numberOfCharacters;
+ lineRun.width = layout.length + layout.widthAdvanceDiff;
+ lineRun.ascender = layout.ascender;
+ lineRun.descender = layout.descender;
+ lineRun.extraLength = layout.wsLengthEndOfLine > 0.f ? layout.wsLengthEndOfLine - layout.widthAdvanceDiff : 0.f;
+ lineRun.direction = false;
+ lineRun.ellipsis = false;
+
+ lines.PushBack( lineRun );
+
+ // Update the actual size.
+ if( lineRun.width > actualSize.width )
{
- GlyphInfo glyph;
- visualModel.GetGlyphs( &glyph, i, 1 );
+ actualSize.width = lineRun.width;
+ }
+
+ actualSize.height += ( lineRun.ascender + -lineRun.descender );
+
+ SetGlyphPositions( layoutParameters.glyphsBuffer + index,
+ layout.numberOfGlyphs,
+ penY,
+ glyphPositions.Begin() + index );
+
+ penY += -layout.descender;
+
+ // Increase the glyph index.
+ index += layout.numberOfGlyphs;
+ }
+ }
- glyphPositions.push_back( Vector2( penX + glyph.xBearing,
- penY - glyph.yBearing ) );
+ DALI_LOG_INFO( gLogFilter, Debug::Verbose, "<--LayoutText\n\n" );
+ return true;
+ }
+
+ void ReLayoutRightToLeftLines( const LayoutParameters& layoutParameters,
+ Vector<Vector2>& glyphPositions )
+ {
+ // Traverses the paragraphs with right to left characters.
+ for( LineIndex lineIndex = 0u; lineIndex < layoutParameters.numberOfBidirectionalInfoRuns; ++lineIndex )
+ {
+ const BidirectionalLineInfoRun& bidiLine = *( layoutParameters.lineBidirectionalInfoRunsBuffer + lineIndex );
+
+ float penX = 0.f;
+
+ const CharacterIndex characterVisualIndex = bidiLine.characterRun.characterIndex + *bidiLine.visualToLogicalMap;
+ const GlyphInfo& glyph = *( layoutParameters.glyphsBuffer + *( layoutParameters.charactersToGlyphsBuffer + characterVisualIndex ) );
+
+ penX = -glyph.xBearing;
+
+ Vector2* glyphPositionsBuffer = glyphPositions.Begin();
+
+ // Traverses the characters of the right to left paragraph.
+ for( CharacterIndex characterLogicalIndex = 0u;
+ characterLogicalIndex < bidiLine.characterRun.numberOfCharacters;
+ ++characterLogicalIndex )
+ {
+ // Convert the character in the logical order into the character in the visual order.
+ const CharacterIndex characterVisualIndex = bidiLine.characterRun.characterIndex + *( bidiLine.visualToLogicalMap + characterLogicalIndex );
+
+ // Get the number of glyphs of the character.
+ const Length numberOfGlyphs = *( layoutParameters.glyphsPerCharacterBuffer + characterVisualIndex );
+
+ 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 );
+
+ const GlyphInfo& glyph = *( layoutParameters.glyphsBuffer + glyphIndex );
+ Vector2& position = *( glyphPositionsBuffer + glyphIndex );
+
+ position.x = penX + glyph.xBearing;
penX += glyph.advance;
}
+ }
+ }
+ }
- // Go to next line
- penX = 0;
- penY += fontMetrics.height;
+ void Align( const Size& layoutSize,
+ Vector<LineRun>& lines )
+ {
+ // Traverse all lines and align the glyphs.
- actualSize.height += fontMetrics.height;
+ for( Vector<LineRun>::Iterator it = lines.Begin(), endIt = lines.End();
+ it != endIt;
+ ++it )
+ {
+ LineRun& line = *it;
+ const bool isLastLine = lines.End() == it + 1u;
+
+ // Calculate the alignment offset accordingly with the align option,
+ // the box width, line length, and the paragraphs direction.
+ CalculateHorizontalAlignment( layoutSize.width,
+ line,
+ isLastLine );
+ }
+ }
+
+ void CalculateHorizontalAlignment( float boxWidth,
+ LineRun& line,
+ bool isLastLine )
+ {
+ line.alignmentOffset = 0.f;
+ const bool isRTL = RTL == line.direction;
+ float lineLength = line.width;
+
+ HorizontalAlignment alignment = mHorizontalAlignment;
+ if( isRTL &&
+ ( HORIZONTAL_ALIGN_CENTER != alignment ) )
+ {
+ if( HORIZONTAL_ALIGN_BEGIN == alignment )
+ {
+ alignment = HORIZONTAL_ALIGN_END;
}
+ else
+ {
+ alignment = HORIZONTAL_ALIGN_BEGIN;
+ }
+ }
- visualModel.SetGlyphPositions( &glyphPositions[0], glyphCount );
+ switch( alignment )
+ {
+ case HORIZONTAL_ALIGN_BEGIN:
+ {
+ line.alignmentOffset = 0.f;
+ break;
+ }
+ case HORIZONTAL_ALIGN_CENTER:
+ {
+ line.alignmentOffset = floorf( 0.5f * ( boxWidth - lineLength ) ); // try to avoid pixel alignment.
+ break;
+ }
+ case HORIZONTAL_ALIGN_END:
+ {
+ line.alignmentOffset = boxWidth - lineLength;
+ break;
+ }
+ }
- visualModel.SetActualSize( actualSize );
+ if( isRTL )
+ {
+ line.alignmentOffset -= line.extraLength;
}
}
- unsigned int mLayout;
+ LayoutEngine::Layout mLayout;
+ LayoutEngine::HorizontalAlignment mHorizontalAlignment;
+ LayoutEngine::VerticalAlignment mVerticalAlignment;
TextAbstraction::FontClient mFontClient;
+
+ bool mEllipsisEnabled:1;
};
LayoutEngine::LayoutEngine()
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::SetTextEllipsisEnabled( bool enabled )
+{
+ mImpl->mEllipsisEnabled = enabled;
+}
+
+bool LayoutEngine::GetTextEllipsisEnabled() const
+{
+ return mImpl->mEllipsisEnabled;
+}
+
+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 Size& layoutSize,
+ Vector<LineRun>& lines )
+{
+ mImpl->Align( layoutSize,
+ lines );
}
} // namespace Text
projects / platform / core / uifw / dali-toolkit.git / blobdiff