#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/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 numberOfCharacters; ///< The number of characters which fit in one line.
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 height; ///< The maximum height of all fonts in 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();
}
/**
- * Retrieves the line layout for a given box width.
+ * @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 GetLineLayoutForBox( const LayoutParameters& parameters,
- LineLayout& lineLayout )
+ void UpdateLineHeight( FontId fontId, LineLayout& lineLayout )
{
- // 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;
+ Text::FontMetrics fontMetrics;
+ mFontClient.GetFontMetrics( fontId, fontMetrics );
- FontId lastFontId = 0u;
- for( GlyphIndex glyphIndex = lineLayout.glyphIndex;
- glyphIndex < parameters.totalNumberOfGlyphs;
- ++glyphIndex )
+ // Sets the maximum ascender.
+ if( fontMetrics.ascender > lineLayout.ascender )
{
- // 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.
- lineLayout.numberOfCharacters += charactersPerGlyph;
-
- // Increase the number of glyphs.
- lineLayout.numberOfGlyphs++;
+ lineLayout.ascender = fontMetrics.ascender;
+ }
- // Increase the accumulated length.
- lineLayout.length += ( glyphIndex == lastGlyphIndex ) ? glyphInfo.width : glyphInfo.advance;
+ // Sets the minimum descender.
+ if( fontMetrics.descender < lineLayout.descender )
+ {
+ lineLayout.descender = fontMetrics.descender;
+ }
+ }
- if( TextAbstraction::LINE_MUST_BREAK == lineBreakInfo )
- {
- }
- if( TextAbstraction::WORD_BREAK == wordBreakInfo )
- {
- }
+ /**
+ * @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 )
+ {
+ lineLayout.numberOfCharacters += tmpLineLayout.numberOfCharacters;
+ lineLayout.numberOfGlyphs += tmpLineLayout.numberOfGlyphs;
+ lineLayout.length += tmpLineLayout.length;
- if( lastFontId != glyphInfo.fontId )
- {
- Text::FontMetrics fontMetrics;
- mFontClient.GetFontMetrics( glyphInfo.fontId, fontMetrics );
+ if( 0.f < tmpLineLayout.length )
+ {
+ lineLayout.length += lineLayout.wsLengthEndOfLine;
- // Sets the maximum height.
- if( fontMetrics.height > lineLayout.height )
- {
- lineLayout.height = fontMetrics.height;
- }
+ lineLayout.wsLengthEndOfLine = tmpLineLayout.wsLengthEndOfLine;
+ lineLayout.widthAdvanceDiff = tmpLineLayout.widthAdvanceDiff;
+ }
+ else
+ {
+ lineLayout.wsLengthEndOfLine += tmpLineLayout.wsLengthEndOfLine;
+ }
- // Sets the maximum ascender.
- if( fontMetrics.ascender > lineLayout.ascender )
- {
- lineLayout.ascender = fontMetrics.ascender;
- }
+ if( tmpLineLayout.ascender > lineLayout.ascender )
+ {
+ lineLayout.ascender = tmpLineLayout.ascender;
+ }
- lastFontId = glyphInfo.fontId;
- }
+ if( tmpLineLayout.descender < lineLayout.descender )
+ {
+ lineLayout.descender = tmpLineLayout.descender;
}
}
/**
* 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 GetMultiLineLayoutForBox( const LayoutParameters& parameters,
- LineLayout& lineLayout )
+ void GetLineLayoutForBox( const LayoutParameters& parameters,
+ LineLayout& lineLayout,
+ bool completelyFill )
{
- // 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;
-
+ 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;
- 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 bool isMultiline = mLayout == MULTI_LINE_BOX;
const GlyphIndex lastGlyphIndex = parameters.totalNumberOfGlyphs - 1u;
- FontId lastFontId = 0u;
+ // 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;
+
+ bool oneWordLaidOut = false;
+
for( GlyphIndex glyphIndex = lineLayout.glyphIndex;
glyphIndex < parameters.totalNumberOfGlyphs;
++glyphIndex )
{
+ 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 );
// Increase the number of glyphs.
tmpLineLayout.numberOfGlyphs++;
- // Increase the accumulated length.
- tmpLineLayout.length += ( glyphIndex == lastGlyphIndex ) ? glyphInfo.width : glyphInfo.advance;
+ // Check whether is a white space.
+ const Character character = *( parameters.textBuffer + characterFirstIndex );
+ const bool isWhiteSpace = TextAbstraction::IsWhiteSpace( character );
- // Check if the accumulated length fits in the width of the box.
- if( lineLayout.length + tmpLineLayout.length > parameters.boundingBox.width )
+ // 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 )
{
- // Current word does not fit in the box's width.
- return;
+ // 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;
+ }
- if( TextAbstraction::LINE_MUST_BREAK == lineBreakInfo )
+ // 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 ) )
{
- if( glyphIndex == lastGlyphIndex )
+ // Current word does not fit in the box's width.
+ if( !oneWordLaidOut || completelyFill )
{
- // 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;
+ DALI_LOG_INFO( gLogFilter, Debug::Verbose, " Break the word by character\n" );
- if( tmpLineLayout.height > lineLayout.height )
+ // The word's with doesn't fit in the control's with. It needs to be split by character.
+ if( tmpLineLayout.numberOfGlyphs > 0u )
{
- lineLayout.height = tmpLineLayout.height;
+ tmpLineLayout.numberOfCharacters -= charactersPerGlyph;
+ --tmpLineLayout.numberOfGlyphs;
+ tmpLineLayout.length = previousTmpLineLength;
+ tmpLineLayout.widthAdvanceDiff = previousTmpWidthAdvanceDiff;
}
- if( tmpLineLayout.ascender > lineLayout.ascender )
- {
- lineLayout.ascender = tmpLineLayout.ascender;
- }
+ // 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 );
- tmpLineLayout.numberOfCharacters = 0u;
- tmpLineLayout.numberOfGlyphs = 0u;
- tmpLineLayout.length = 0u;
- tmpLineLayout.wsLengthEndOfLine = 0u;
- tmpLineLayout.height = 0.f;
- tmpLineLayout.ascender = 0.f;
+ DALI_LOG_INFO( gLogFilter, Debug::Verbose, " Must break\n" );
+ DALI_LOG_INFO( gLogFilter, Debug::Verbose, "<--GetLineLayoutForBox\n" );
return;
}
- if( TextAbstraction::WORD_BREAK == wordBreakInfo )
+ 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.
- 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;
- }
+ MergeLineLayout( lineLayout, tmpLineLayout );
- if( tmpLineLayout.ascender > lineLayout.ascender )
- {
- lineLayout.ascender = tmpLineLayout.ascender;
- }
-
- tmpLineLayout.numberOfCharacters = 0u;
- tmpLineLayout.numberOfGlyphs = 0u;
- tmpLineLayout.length = 0u;
- tmpLineLayout.wsLengthEndOfLine = 0u;
- tmpLineLayout.height = 0.f;
- tmpLineLayout.ascender = 0.f;
+ tmpLineLayout.Clear();
}
+ // 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 )
{
- Text::FontMetrics fontMetrics;
- mFontClient.GetFontMetrics( glyphInfo.fontId, fontMetrics );
-
- // Sets the maximum height.
- if( fontMetrics.height > tmpLineLayout.height )
- {
- tmpLineLayout.height = fontMetrics.height;
- }
-
- // Sets the maximum ascender.
- if( fontMetrics.ascender > tmpLineLayout.ascender )
- {
- tmpLineLayout.ascender = fontMetrics.ascender;
- }
-
+ UpdateLineHeight( glyphInfo.fontId, tmpLineLayout );
lastFontId = glyphInfo.fontId;
}
}
+ DALI_LOG_INFO( gLogFilter, Debug::Verbose, "<--GetLineLayoutForBox\n" );
}
- bool LayoutText( const LayoutParameters& layoutParameters,
- Vector<Vector2>& glyphPositions,
- Size& actualSize )
+ void SetGlyphPositions( const GlyphInfo* const glyphsBuffer,
+ Length numberOfGlyphs,
+ float penY,
+ Vector2* glyphPositionsBuffer )
{
- // TODO Switch between different layouts
- bool update = false;
-
- 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;
- }
+ // Traverse the glyphs and set the positions.
- 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 );
+ // 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( 0u == layout.numberOfGlyphs )
+ const GlyphInfo& glyph = *glyphsBuffer;
+ if( 0.f > glyph.xBearing )
{
- // The width is too small and no characters are laid-out.
- return false;
+ penX = -glyph.xBearing;
}
- // 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 )
+ for( GlyphIndex i = 0u; i < numberOfGlyphs; ++i )
{
- const GlyphInfo& glyph = *( layoutParameters.glyphsBuffer + glyphIndex );
- Vector2& position = *( glyphPositionsBuffer + glyphIndex );
+ const GlyphInfo& glyph = *( glyphsBuffer + i );
+ Vector2& position = *( glyphPositionsBuffer + i );
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 )
+ 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 );
+
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 );
+ 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 )
{
// 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;
}
- // Update the actual size.
- if( layout.length > actualSize.width )
+ // 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();
+
+ LineRun lineRun;
+ LineLayout ellipsisLayout;
+ if( 0u != numberOfLines )
+ {
+ // Get the last line and layout it again with the 'completelyFill' flag to true.
+ lineRun = *( lines.Begin() + ( numberOfLines - 1u ) );
+
+ penY -= layout.ascender - lineRun.descender;
+
+ ellipsisLayout.glyphIndex = lineRun.glyphIndex;
+ }
+ else
+ {
+ lineRun.glyphIndex = 0u;
+ ellipsisLayout.glyphIndex = 0u;
+ }
+
+ 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( 0u != numberOfLines )
+ {
+ // Set the last line with the ellipsis layout.
+ *( lines.Begin() + ( numberOfLines - 1u ) ) = lineRun;
+ }
+ else
+ {
+ // Push the line.
+ lines.PushBack( lineRun );
+ }
+
+ break;
+ }
+ else
{
- actualSize.width = layout.length;
+ 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 )
+ {
+ 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;
}
+ }
+
+ DALI_LOG_INFO( gLogFilter, Debug::Verbose, "<--LayoutText\n\n" );
- actualSize.height += layout.height;
+ 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;
- // Traverse the glyphs and set the positions.
+ const CharacterIndex characterVisualIndex = bidiLine.characterRun.characterIndex + *bidiLine.visualToLogicalMap;
+ const GlyphInfo& glyph = *( layoutParameters.glyphsBuffer + *( layoutParameters.charactersToGlyphsBuffer + characterVisualIndex ) );
- penY += layout.height;
+ penX = -glyph.xBearing;
Vector2* glyphPositionsBuffer = glyphPositions.Begin();
- for( GlyphIndex i = index; i < index + layout.numberOfGlyphs; ++i )
+
+ // Traverses the characters of the right to left paragraph.
+ for( CharacterIndex characterLogicalIndex = 0u;
+ characterLogicalIndex < bidiLine.characterRun.numberOfCharacters;
+ ++characterLogicalIndex )
{
- const GlyphInfo& glyph = *( layoutParameters.glyphsBuffer + i );
- Vector2& position = *( glyphPositionsBuffer + i );
+ // 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;
- position.x = penX + glyph.xBearing;
- position.y = penY - glyph.yBearing;
+ DALI_ASSERT_DEBUG( 0u <= glyphIndex && glyphIndex < layoutParameters.totalNumberOfGlyphs );
- penX += glyph.advance;
+ const GlyphInfo& glyph = *( layoutParameters.glyphsBuffer + glyphIndex );
+ Vector2& position = *( glyphPositionsBuffer + glyphIndex );
+
+ position.x = penX + glyph.xBearing;
+ penX += glyph.advance;
+ }
}
+ }
+ }
- // Increase the glyph index.
- index += layout.numberOfGlyphs;
+ void Align( const Size& layoutSize,
+ Vector<LineRun>& lines )
+ {
+ // Traverse all lines and align the glyphs.
+
+ 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 );
}
+ }
- return true;
+ 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;
+ }
+ }
+
+ 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;
+ }
+ }
+
+ if( isRTL )
+ {
+ line.alignmentOffset -= line.extraLength;
+ }
}
LayoutEngine::Layout mLayout;
+ LayoutEngine::HorizontalAlignment mHorizontalAlignment;
+ LayoutEngine::VerticalAlignment mVerticalAlignment;
TextAbstraction::FontClient mFontClient;
+
+ bool mEllipsisEnabled:1;
};
LayoutEngine::LayoutEngine()
return mImpl->mLayout;
}
+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
} // namespace Toolkit
projects / platform / core / uifw / dali-toolkit.git / blobdiff