#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>
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 wsLengthEndOfLine; ///< The length of the white spaces at the end of the line.
+ float height; ///< The maximum height of all fonts in the line.
+ float ascender; ///< The maximum ascender of all fonts in the line.
+};
+
struct LayoutEngine::Impl
{
Impl()
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.height = 0.f;
+ lineLayout.ascender = 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() );
+ // 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 );
- UpdateGlyphPositions( boundingBox, visualModel );
- }
+ // Get the line break info for the current character.
+ const LineBreakInfo lineBreakInfo = *( parameters.lineBreakInfoBuffer + characterLastIndex );
- void UpdateGlyphPositions( const Vector2& boundingBox, VisualModel& visualModel )
- {
- if( LayoutEngine::SINGLE_LINE_BOX == mLayout )
- {
- SingleLineLayout( boundingBox, visualModel );
- }
- else
- {
- MultiLineLayout( boundingBox, visualModel );
- }
- }
+ // Get the word break info for the current character.
+ const WordBreakInfo wordBreakInfo = *( parameters.wordBreakInfoBuffer + characterLastIndex );
- // TODO - Rewrite this to handle bidi
- void SingleLineLayout( const Vector2& boundingBox, VisualModel& visualModel )
- {
- Length glyphCount = visualModel.GetNumberOfGlyphs();
-
- std::vector<Vector2> glyphPositions;
- glyphPositions.reserve( glyphCount );
+ // Increase the number of characters.
+ lineLayout.numberOfCharacters += charactersPerGlyph;
- if( glyphCount > 0 )
- {
- // FIXME Single font assumption
- Text::FontMetrics fontMetrics;
- GlyphInfo firstGlyph;
- visualModel.GetGlyphs( &firstGlyph, 0, 1 );
- mFontClient.GetFontMetrics( firstGlyph.fontId, fontMetrics );
+ // Increase the number of glyphs.
+ lineLayout.numberOfGlyphs++;
- float penX( 0 );
- float penY( fontMetrics.ascender ); // Move to baseline
+ // Increase the accumulated length.
+ lineLayout.length += ( glyphIndex == lastGlyphIndex ) ? glyphInfo.width : glyphInfo.advance;
- for( unsigned int i=0; i<glyphCount; ++i )
+ if( TextAbstraction::LINE_MUST_BREAK == lineBreakInfo )
+ {
+ }
+ if( TextAbstraction::WORD_BREAK == wordBreakInfo )
{
- GlyphInfo glyph;
- visualModel.GetGlyphs( &glyph, i, 1 );
+ }
- glyphPositions.push_back( Vector2( penX + glyph.xBearing,
- penY - glyph.yBearing ) );
+ if( lastFontId != glyphInfo.fontId )
+ {
+ Text::FontMetrics fontMetrics;
+ mFontClient.GetFontMetrics( glyphInfo.fontId, fontMetrics );
- penX += glyph.advance;
- }
+ // Sets the maximum height.
+ if( fontMetrics.height > lineLayout.height )
+ {
+ lineLayout.height = fontMetrics.height;
+ }
- visualModel.SetGlyphPositions( &glyphPositions[0], glyphCount );
+ // Sets the maximum ascender.
+ if( fontMetrics.ascender > lineLayout.ascender )
+ {
+ lineLayout.ascender = fontMetrics.ascender;
+ }
- visualModel.SetActualSize( Vector2(penX, fontMetrics.height) );
+ lastFontId = glyphInfo.fontId;
+ }
}
}
- // TODO - Rewrite this to handle bidi
- void MultiLineLayout( const Vector2& boundingBox, VisualModel& visualModel )
+ /**
+ * Retrieves the line layout for a given box width.
+ */
+ void GetMultiLineLayoutForBox( const LayoutParameters& parameters,
+ LineLayout& lineLayout )
{
- Length glyphCount = visualModel.GetNumberOfGlyphs();
+ // Initializes the line layout.
+ lineLayout.numberOfCharacters = 0u;
+ lineLayout.numberOfGlyphs = 0u;
+ lineLayout.length = 0.f;
+ lineLayout.wsLengthEndOfLine = 0.f;
+ lineLayout.height = 0.f;
+ lineLayout.ascender = 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.wsLengthEndOfLine = 0.f;
+ tmpLineLayout.height = 0.f;
+ tmpLineLayout.ascender = 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 );
- std::vector<Vector2> glyphPositions;
- glyphPositions.reserve( glyphCount );
+ // 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 );
- if( glyphCount > 0 )
- {
- Size actualSize;
+ // Get the line break info for the current character.
+ const LineBreakInfo lineBreakInfo = *( parameters.lineBreakInfoBuffer + characterLastIndex );
- // FIXME Single font assumption
- Text::FontMetrics fontMetrics;
- GlyphInfo firstGlyph;
- visualModel.GetGlyphs( &firstGlyph, 0, 1 );
- mFontClient.GetFontMetrics( firstGlyph.fontId, fontMetrics );
+ // Get the word break info for the current character.
+ const WordBreakInfo wordBreakInfo = *( parameters.wordBreakInfoBuffer + characterLastIndex );
- float penX( 0 );
- float penY( fontMetrics.ascender ); // Move to baseline
+ // Increase the number of characters.
+ tmpLineLayout.numberOfCharacters += charactersPerGlyph;
- unsigned int i=0;
- while( i < glyphCount )
+ // Increase the number of glyphs.
+ tmpLineLayout.numberOfGlyphs++;
+
+ // Increase the accumulated length.
+ tmpLineLayout.length += ( glyphIndex == lastGlyphIndex ) ? glyphInfo.width : glyphInfo.advance;
+
+ // Check if the accumulated length fits in the width of the box.
+ if( lineLayout.length + tmpLineLayout.length > parameters.boundingBox.width )
+ {
+ // Current word does not fit in the box's width.
+ return;
+ }
+
+ if( TextAbstraction::LINE_MUST_BREAK == lineBreakInfo )
{
- // Skip initial whitespace
- for( ; i<glyphCount; ++i )
+ if( glyphIndex == lastGlyphIndex )
{
- GlyphInfo glyph;
- visualModel.GetGlyphs( &glyph, i, 1 );
+ // Must break the line. Update the line layout and return.
+ lineLayout.numberOfCharacters += tmpLineLayout.numberOfCharacters;
+ lineLayout.numberOfGlyphs += tmpLineLayout.numberOfGlyphs;
+ lineLayout.length += tmpLineLayout.length;
+ lineLayout.wsLengthEndOfLine = tmpLineLayout.wsLengthEndOfLine;
- if( glyph.width > 0 &&
- glyph.height > 0 )
+ if( tmpLineLayout.height > lineLayout.height )
{
- break;
+ lineLayout.height = tmpLineLayout.height;
}
- else
+
+ if( tmpLineLayout.ascender > lineLayout.ascender )
{
- glyphPositions.push_back( Vector2( penX + glyph.xBearing,
- penY - glyph.yBearing ) );
+ lineLayout.ascender = tmpLineLayout.ascender;
}
}
- // Find last glyph for the next line
- unsigned int endIndex = i;
- float endPenX = penX;
- unsigned int j=i;
- for( ; j<glyphCount; ++j )
- {
- GlyphInfo glyph;
- visualModel.GetGlyphs( &glyph, j, 1 );
+ tmpLineLayout.numberOfCharacters = 0u;
+ tmpLineLayout.numberOfGlyphs = 0u;
+ tmpLineLayout.length = 0u;
+ tmpLineLayout.wsLengthEndOfLine = 0u;
+ tmpLineLayout.height = 0.f;
+ tmpLineLayout.ascender = 0.f;
+ return;
+ }
- endPenX += glyph.advance;
+ 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.wsLengthEndOfLine = tmpLineLayout.wsLengthEndOfLine;
+
+ if( tmpLineLayout.height > lineLayout.height )
+ {
+ lineLayout.height = tmpLineLayout.height;
+ }
- if( glyph.width <= 0 ||
- glyph.height <= 0 )
- {
- // Potential line end found
- endIndex = j;
- }
- else if( endPenX > boundingBox.width )
- {
- break;
- }
+ if( tmpLineLayout.ascender > lineLayout.ascender )
+ {
+ lineLayout.ascender = tmpLineLayout.ascender;
}
- actualSize.width = ( actualSize.width < endPenX ) ? endPenX : actualSize.width;
+ tmpLineLayout.numberOfCharacters = 0u;
+ tmpLineLayout.numberOfGlyphs = 0u;
+ tmpLineLayout.length = 0u;
+ tmpLineLayout.wsLengthEndOfLine = 0u;
+ tmpLineLayout.height = 0.f;
+ tmpLineLayout.ascender = 0.f;
+ }
+
+ if( lastFontId != glyphInfo.fontId )
+ {
+ Text::FontMetrics fontMetrics;
+ mFontClient.GetFontMetrics( glyphInfo.fontId, fontMetrics );
- // If end of text or no whitespace found
- if( glyphCount == j ||
- endIndex == i )
+ // Sets the maximum height.
+ if( fontMetrics.height > tmpLineLayout.height )
{
- endIndex = j;
+ tmpLineLayout.height = fontMetrics.height;
}
- for( ; i<endIndex; ++i )
+ // Sets the maximum ascender.
+ if( fontMetrics.ascender > tmpLineLayout.ascender )
{
- GlyphInfo glyph;
- visualModel.GetGlyphs( &glyph, i, 1 );
+ tmpLineLayout.ascender = fontMetrics.ascender;
+ }
- glyphPositions.push_back( Vector2( penX + glyph.xBearing,
- penY - glyph.yBearing ) );
+ lastFontId = glyphInfo.fontId;
+ }
+ }
+ }
- penX += glyph.advance;
- }
+ bool LayoutText( const LayoutParameters& layoutParameters,
+ Vector<Vector2>& glyphPositions,
+ Size& actualSize )
+ {
+ // TODO Switch between different layouts
+ bool update = false;
- // Go to next line
- penX = 0;
- penY += fontMetrics.height;
+ switch( mLayout )
+ {
+ case LayoutEngine::SINGLE_LINE_BOX:
+ {
+ update = SingleLineLayout( layoutParameters,
+ glyphPositions,
+ actualSize );
+ break;
+ }
+ case LayoutEngine::MULTI_LINE_BOX:
+ {
+ update = MultiLineLayout( layoutParameters,
+ glyphPositions,
+ actualSize );
+ break;
+ }
+ default:
+ break;
+ }
+
+ return update;
+ }
+
+ // TODO - Rewrite this to handle bidi
+ bool SingleLineLayout( const LayoutParameters& layoutParameters,
+ Vector<Vector2>& glyphPositions,
+ Size& actualSize )
+ {
+ LineLayout layout;
+ layout.glyphIndex = 0u;
+ GetLineLayoutForBox( layoutParameters,
+ layout );
- actualSize.height += fontMetrics.height;
+ if( 0u == layout.numberOfGlyphs )
+ {
+ // The width is too small and no characters are laid-out.
+ return false;
+ }
+
+ // Update the actual size.
+ actualSize.width = layout.length;
+ actualSize.height = layout.height;
+
+ float penX = 0.f;
+ float penY = layout.height;
+
+ Vector2* glyphPositionsBuffer = glyphPositions.Begin();
+ for( GlyphIndex glyphIndex = 0u; glyphIndex < layout.numberOfGlyphs; ++glyphIndex )
+ {
+ const GlyphInfo& glyph = *( layoutParameters.glyphsBuffer + glyphIndex );
+ Vector2& position = *( glyphPositionsBuffer + glyphIndex );
+
+ position.x = penX + glyph.xBearing;
+ position.y = penY - glyph.yBearing;
+
+ penX += glyph.advance;
+ }
+
+ return true;
+ }
+
+ // TODO - Rewrite this to handle bidi
+ bool MultiLineLayout( const LayoutParameters& layoutParameters,
+ Vector<Vector2>& glyphPositions,
+ 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;
}
- visualModel.SetGlyphPositions( &glyphPositions[0], glyphCount );
+ // Update the actual size.
+ if( layout.length > actualSize.width )
+ {
+ actualSize.width = layout.length;
+ }
+
+ actualSize.height += layout.height;
+
+ // Traverse the glyphs and set the positions.
+
+ penY += layout.height;
+
+ Vector2* glyphPositionsBuffer = glyphPositions.Begin();
+ for( GlyphIndex i = index; i < index + layout.numberOfGlyphs; ++i )
+ {
+ const GlyphInfo& glyph = *( layoutParameters.glyphsBuffer + i );
+ Vector2& position = *( glyphPositionsBuffer + i );
+
+ position.x = penX + glyph.xBearing;
+ position.y = penY - glyph.yBearing;
+
+ penX += glyph.advance;
+ }
- visualModel.SetActualSize( actualSize );
+ // Increase the glyph index.
+ index += layout.numberOfGlyphs;
}
+
+ return true;
}
- unsigned int mLayout;
+ LayoutEngine::Layout mLayout;
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 )
+bool LayoutEngine::LayoutText( const LayoutParameters& layoutParameters,
+ Vector<Vector2>& glyphPositions,
+ Size& actualSize )
{
- mImpl->UpdateVisualModel( boundingBox,
- glyphs,
- characterIndices,
- charactersPerGlyph,
- visualModel );
+ return mImpl->LayoutText( layoutParameters,
+ glyphPositions,
+ actualSize );
}
} // namespace Text
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