/*
- * Copyright (c) 2015 Samsung Electronics Co., Ltd.
+ * Copyright (c) 2020 Samsung Electronics Co., Ltd.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
// EXTERNAL INCLUDES
#include <limits>
+#include <cmath>
#include <dali/integration-api/debug.h>
#include <dali/devel-api/text-abstraction/font-client.h>
// INTERNAL INCLUDES
+#include <dali-toolkit/internal/text/bidirectional-support.h>
+#include <dali-toolkit/internal/text/cursor-helper-functions.h>
+#include <dali-toolkit/internal/text/glyph-metrics-helper.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 Layout
+{
+
namespace
{
#endif
const float MAX_FLOAT = std::numeric_limits<float>::max();
-const bool RTL = true;
-const float CURSOR_WIDTH = 1.f;
+const CharacterDirection LTR = false;
+const CharacterDirection RTL = !LTR;
+const float LINE_SPACING= 0.f;
+
+inline bool isEmptyLineAtLast( const Vector<LineRun>& lines, const Vector<LineRun>::Iterator& line )
+{
+ return ( (*line).characterRun.numberOfCharacters == 0 && line + 1u == lines.End() );
+}
} //namespace
struct LineLayout
{
LineLayout()
- : glyphIndex( 0u ),
- characterIndex( 0u ),
- numberOfGlyphs( 0u ),
- numberOfCharacters( 0u ),
- length( 0.f ),
- extraBearing( 0.f ),
- extraWidth( 0.f ),
- wsLengthEndOfLine( 0.f ),
- ascender( 0.f ),
- descender( MAX_FLOAT )
+ : glyphIndex{ 0u },
+ characterIndex{ 0u },
+ numberOfGlyphs{ 0u },
+ numberOfCharacters{ 0u },
+ ascender{ -MAX_FLOAT },
+ descender{ MAX_FLOAT },
+ lineSpacing{ 0.f },
+ penX{ 0.f },
+ previousAdvance{ 0.f },
+ length{ 0.f },
+ whiteSpaceLengthEndOfLine{ 0.f },
+ direction{ LTR }
{}
~LineLayout()
characterIndex = 0u;
numberOfGlyphs = 0u;
numberOfCharacters = 0u;
- length = 0.f;
- extraBearing = 0.f;
- extraWidth = 0.f;
- wsLengthEndOfLine = 0.f;
- ascender = 0.f;
+ ascender = -MAX_FLOAT;
descender = MAX_FLOAT;
+ direction = LTR;
+ }
+
+ 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 ascender; ///< The maximum ascender of all fonts in the line.
+ float descender; ///< The minimum descender of all fonts in the line.
+ float lineSpacing; ///< The line spacing
+ float penX; ///< The origin of the current glyph ( is the start point plus the accumulation of all advances ).
+ float previousAdvance; ///< The advance of the previous glyph.
+ float length; ///< The current length of the line.
+ float whiteSpaceLengthEndOfLine; ///< The length of the white spaces at the end of the line.
+ CharacterDirection direction;
+};
+
+struct LayoutBidiParameters
+{
+ void Clear()
+ {
+ paragraphDirection = LTR;
+ bidiParagraphIndex = 0u;
+ bidiLineIndex = 0u;
+ isBidirectional = false;
}
- 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 addition of the advance metric of all the glyphs which fit in one line.
- float extraBearing; ///< The extra width to be added to the line's length when the bearing of the first glyph is negative.
- float extraWidth; ///< The extra width to be added to the line's length when the bearing + width of the last glyph is greater than the advance.
- 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.
+ CharacterDirection paragraphDirection = LTR; ///< The paragraph's direction.
+ BidirectionalRunIndex bidiParagraphIndex = 0u; ///< Index to the paragraph's bidi info.
+ BidirectionalLineRunIndex bidiLineIndex = 0u; ///< Index where to insert the next bidi line info.
+ bool isBidirectional = false; ///< Whether the text is bidirectional.
};
-struct LayoutEngine::Impl
+struct Engine::Impl
{
Impl()
- : mLayout( LayoutEngine::SINGLE_LINE_BOX ),
- mHorizontalAlignment( LayoutEngine::HORIZONTAL_ALIGN_BEGIN ),
- mVerticalAlignment( LayoutEngine::VERTICAL_ALIGN_TOP ),
- mCursorWidth( CURSOR_WIDTH ),
- mEllipsisEnabled( false )
+ : mLayout{ Layout::Engine::SINGLE_LINE_BOX },
+ mCursorWidth{ 0.f },
+ mDefaultLineSpacing{ LINE_SPACING }
{
}
/**
* @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] glyphMetrics The metrics of the new font.
* @param[in,out] lineLayout The line layout.
*/
- void UpdateLineHeight( FontId fontId, LineLayout& lineLayout )
+ void UpdateLineHeight( const GlyphMetrics& glyphMetrics, LineLayout& lineLayout )
{
Text::FontMetrics fontMetrics;
- mMetrics->GetFontMetrics( fontId, fontMetrics );
-
- // Sets the maximum ascender.
- if( fontMetrics.ascender > lineLayout.ascender )
+ if( 0u != glyphMetrics.fontId )
{
- lineLayout.ascender = fontMetrics.ascender;
+ mMetrics->GetFontMetrics( glyphMetrics.fontId, fontMetrics );
}
-
- // Sets the minimum descender.
- if( fontMetrics.descender < lineLayout.descender )
+ else
{
- lineLayout.descender = fontMetrics.descender;
+ fontMetrics.ascender = glyphMetrics.fontHeight;
+ fontMetrics.descender = 0.f;
+ fontMetrics.height = fontMetrics.ascender;
+ fontMetrics.underlinePosition = 0.f;
+ fontMetrics.underlineThickness = 1.f;
}
+
+ // Sets the maximum ascender.
+ lineLayout.ascender = std::max( lineLayout.ascender, fontMetrics.ascender );
+
+ // Sets the minimum descender.
+ lineLayout.descender = std::min( lineLayout.descender, fontMetrics.descender );
+
+ // set the line spacing
+ lineLayout.lineSpacing = mDefaultLineSpacing;
}
/**
{
lineLayout.numberOfCharacters += tmpLineLayout.numberOfCharacters;
lineLayout.numberOfGlyphs += tmpLineLayout.numberOfGlyphs;
- lineLayout.length += tmpLineLayout.length;
- if( 0.f < tmpLineLayout.length )
- {
- lineLayout.length += lineLayout.wsLengthEndOfLine;
+ lineLayout.penX = tmpLineLayout.penX;
+ lineLayout.previousAdvance = tmpLineLayout.previousAdvance;
- lineLayout.wsLengthEndOfLine = tmpLineLayout.wsLengthEndOfLine;
- }
- else
+ lineLayout.length = tmpLineLayout.length;
+ lineLayout.whiteSpaceLengthEndOfLine = tmpLineLayout.whiteSpaceLengthEndOfLine;
+
+ // Sets the maximum ascender.
+ lineLayout.ascender = std::max( lineLayout.ascender, tmpLineLayout.ascender );
+
+ // Sets the minimum descender.
+ lineLayout.descender = std::min( lineLayout.descender, tmpLineLayout.descender );
+ }
+
+ void LayoutRightToLeft( const Parameters& parameters,
+ const BidirectionalLineInfoRun& bidirectionalLineInfo,
+ float& length,
+ float& whiteSpaceLengthEndOfLine )
+ {
+ const Character* const textBuffer = parameters.textModel->mLogicalModel->mText.Begin();
+ const Length* const charactersPerGlyphBuffer = parameters.textModel->mVisualModel->mCharactersPerGlyph.Begin();
+ const GlyphInfo* const glyphsBuffer = parameters.textModel->mVisualModel->mGlyphs.Begin();
+ const GlyphIndex* const charactersToGlyphsBuffer = parameters.textModel->mVisualModel->mCharactersToGlyph.Begin();
+
+ const float outlineWidth = static_cast<float>( parameters.textModel->GetOutlineWidth() );
+ const GlyphIndex lastGlyphOfParagraphPlusOne = parameters.startGlyphIndex + parameters.numberOfGlyphs;
+
+ CharacterIndex characterLogicalIndex = 0u;
+ CharacterIndex characterVisualIndex = bidirectionalLineInfo.characterRun.characterIndex + *( bidirectionalLineInfo.visualToLogicalMap + characterLogicalIndex );
+
+ if( RTL == bidirectionalLineInfo.direction )
{
- lineLayout.wsLengthEndOfLine += tmpLineLayout.wsLengthEndOfLine;
+ while( TextAbstraction::IsWhiteSpace( *( textBuffer + characterVisualIndex ) ) )
+ {
+ const GlyphInfo& glyphInfo = *( glyphsBuffer + *( charactersToGlyphsBuffer + characterVisualIndex ) );
+
+ whiteSpaceLengthEndOfLine += glyphInfo.advance;
+
+ ++characterLogicalIndex;
+ characterVisualIndex = bidirectionalLineInfo.characterRun.characterIndex + *( bidirectionalLineInfo.visualToLogicalMap + characterLogicalIndex );
+ }
}
- if( tmpLineLayout.ascender > lineLayout.ascender )
+ const GlyphIndex glyphIndex = *( charactersToGlyphsBuffer + characterVisualIndex );
+
+ // Check whether the first glyph comes from a character that is shaped in multiple glyphs.
+ const Length numberOfGLyphsInGroup = GetNumberOfGlyphsOfGroup( glyphIndex,
+ lastGlyphOfParagraphPlusOne,
+ charactersPerGlyphBuffer );
+
+ GlyphMetrics glyphMetrics;
+ GetGlyphsMetrics( glyphIndex,
+ numberOfGLyphsInGroup,
+ glyphMetrics,
+ glyphsBuffer,
+ mMetrics );
+
+ float penX = -glyphMetrics.xBearing + mCursorWidth + outlineWidth;
+
+ // Traverses the characters of the right to left paragraph.
+ for( ; characterLogicalIndex < bidirectionalLineInfo.characterRun.numberOfCharacters; )
{
- lineLayout.ascender = tmpLineLayout.ascender;
+ // Convert the character in the logical order into the character in the visual order.
+ const CharacterIndex characterVisualIndex = bidirectionalLineInfo.characterRun.characterIndex + *( bidirectionalLineInfo.visualToLogicalMap + characterLogicalIndex );
+ const bool isWhiteSpace = TextAbstraction::IsWhiteSpace( *( textBuffer + characterVisualIndex ) );
+
+ const GlyphIndex glyphIndex = *( charactersToGlyphsBuffer + characterVisualIndex );
+
+ // Check whether this glyph comes from a character that is shaped in multiple glyphs.
+ const Length numberOfGLyphsInGroup = GetNumberOfGlyphsOfGroup( glyphIndex,
+ lastGlyphOfParagraphPlusOne,
+ charactersPerGlyphBuffer );
+
+ characterLogicalIndex += *( charactersPerGlyphBuffer + glyphIndex + numberOfGLyphsInGroup - 1u );
+
+ GlyphMetrics glyphMetrics;
+ GetGlyphsMetrics( glyphIndex,
+ numberOfGLyphsInGroup,
+ glyphMetrics,
+ glyphsBuffer,
+ mMetrics );
+
+ if( isWhiteSpace )
+ {
+ if( RTL == bidirectionalLineInfo.direction )
+ {
+ length += glyphMetrics.advance;
+ }
+ else
+ {
+ whiteSpaceLengthEndOfLine += glyphMetrics.advance;
+ }
+ penX += glyphMetrics.advance;
+ }
+ else
+ {
+ if( LTR == bidirectionalLineInfo.direction )
+ {
+ whiteSpaceLengthEndOfLine = 0.f;
+ }
+ length = std::max( length, penX + glyphMetrics.xBearing + glyphMetrics.width );
+ penX += ( glyphMetrics.advance + parameters.interGlyphExtraAdvance );
+ }
}
+ }
+
+ void ReorderBiDiLayout( const Parameters& parameters,
+ LayoutBidiParameters& bidiParameters,
+ const LineLayout& currentLineLayout,
+ LineLayout& lineLayout,
+ bool breakInCharacters )
+ {
+ const Length* const charactersPerGlyphBuffer = parameters.textModel->mVisualModel->mCharactersPerGlyph.Begin();
+
+ // The last glyph to be laid-out.
+ const GlyphIndex lastGlyphOfParagraphPlusOne = parameters.startGlyphIndex + parameters.numberOfGlyphs;
- if( tmpLineLayout.descender < lineLayout.descender )
+ const Vector<BidirectionalParagraphInfoRun>& bidirectionalParagraphsInfo = parameters.textModel->mLogicalModel->mBidirectionalParagraphInfo;
+
+ const BidirectionalParagraphInfoRun& bidirectionalParagraphInfo = bidirectionalParagraphsInfo[bidiParameters.bidiParagraphIndex];
+ if( ( lineLayout.characterIndex >= bidirectionalParagraphInfo.characterRun.characterIndex ) &&
+ ( lineLayout.characterIndex < bidirectionalParagraphInfo.characterRun.characterIndex + bidirectionalParagraphInfo.characterRun.numberOfCharacters ) )
{
- lineLayout.descender = tmpLineLayout.descender;
+ Vector<BidirectionalLineInfoRun>& bidirectionalLinesInfo = parameters.textModel->mLogicalModel->mBidirectionalLineInfo;
+
+ // Sets the visual to logical map tables needed to reorder the text.
+ ReorderLine( bidirectionalParagraphInfo,
+ bidirectionalLinesInfo,
+ bidiParameters.bidiLineIndex,
+ lineLayout.characterIndex,
+ lineLayout.numberOfCharacters,
+ bidiParameters.paragraphDirection );
+
+ // Recalculate the length of the line and update the layout.
+ const BidirectionalLineInfoRun& bidirectionalLineInfo = *( bidirectionalLinesInfo.Begin() + bidiParameters.bidiLineIndex );
+
+ if( !bidirectionalLineInfo.isIdentity )
+ {
+ float length = 0.f;
+ float whiteSpaceLengthEndOfLine = 0.f;
+ LayoutRightToLeft( parameters,
+ bidirectionalLineInfo,
+ length,
+ whiteSpaceLengthEndOfLine );
+
+ lineLayout.whiteSpaceLengthEndOfLine = whiteSpaceLengthEndOfLine;
+ if( !Equals( length, lineLayout.length ) )
+ {
+ const bool isMultiline = mLayout == MULTI_LINE_BOX;
+
+ if( isMultiline && ( length > parameters.boundingBox.width ) )
+ {
+ if( breakInCharacters || ( isMultiline && ( 0u == currentLineLayout.numberOfGlyphs ) ) )
+ {
+ // The word doesn't fit in one line. It has to be split by character.
+
+ // Remove the last laid out glyph(s) as they doesn't fit.
+ for( GlyphIndex glyphIndex = lineLayout.glyphIndex + lineLayout.numberOfGlyphs - 1u; glyphIndex >= lineLayout.glyphIndex; )
+ {
+ const Length numberOfGLyphsInGroup = GetNumberOfGlyphsOfGroup( glyphIndex,
+ lastGlyphOfParagraphPlusOne,
+ charactersPerGlyphBuffer );
+
+ const Length numberOfCharacters = *( charactersPerGlyphBuffer + glyphIndex + numberOfGLyphsInGroup - 1u );
+
+ lineLayout.numberOfGlyphs -= numberOfGLyphsInGroup;
+ lineLayout.numberOfCharacters -= numberOfCharacters;
+
+ AdjustLayout( parameters,
+ bidiParameters,
+ bidirectionalParagraphInfo,
+ lineLayout );
+
+ if( lineLayout.length < parameters.boundingBox.width )
+ {
+ break;
+ }
+
+ if( glyphIndex < numberOfGLyphsInGroup )
+ {
+ // avoids go under zero for an unsigned int.
+ break;
+ }
+
+ glyphIndex -= numberOfGLyphsInGroup;
+ }
+ }
+ else
+ {
+ lineLayout = currentLineLayout;
+
+ AdjustLayout( parameters,
+ bidiParameters,
+ bidirectionalParagraphInfo,
+ lineLayout );
+ }
+ }
+ else
+ {
+ lineLayout.length = std::max( length, lineLayout.length );
+ }
+ }
+ }
}
}
+ void AdjustLayout( const Parameters& parameters,
+ LayoutBidiParameters& bidiParameters,
+ const BidirectionalParagraphInfoRun& bidirectionalParagraphInfo,
+ LineLayout& lineLayout )
+ {
+ Vector<BidirectionalLineInfoRun>& bidirectionalLinesInfo = parameters.textModel->mLogicalModel->mBidirectionalLineInfo;
+
+ // Remove current reordered line.
+ bidirectionalLinesInfo.Erase( bidirectionalLinesInfo.Begin() + bidiParameters.bidiLineIndex );
+
+ // Re-build the conversion table without the removed glyphs.
+ ReorderLine( bidirectionalParagraphInfo,
+ bidirectionalLinesInfo,
+ bidiParameters.bidiLineIndex,
+ lineLayout.characterIndex,
+ lineLayout.numberOfCharacters,
+ bidiParameters.paragraphDirection );
+
+ const BidirectionalLineInfoRun& bidirectionalLineInfo = *( bidirectionalLinesInfo.Begin() + bidiParameters.bidiLineIndex );
+
+ float length = 0.f;
+ float whiteSpaceLengthEndOfLine = 0.f;
+ LayoutRightToLeft( parameters,
+ bidirectionalLineInfo,
+ length,
+ whiteSpaceLengthEndOfLine );
+
+ lineLayout.length = length;
+ lineLayout.whiteSpaceLengthEndOfLine = whiteSpaceLengthEndOfLine;
+ }
+
/**
* Retrieves the line layout for a given box width.
*
- * @note This method lais out text as it were left to right. At this point is not possible to reorder the line
- * because the number of characters of the line is not known (one of the responsabilities of this method
- * is calculate that). Due to glyph's 'x' bearing, width and advance, when right to left or mixed right to left
- * and left to right text is laid out, it can be small differences in the line length. One solution is to
- * reorder and re-lay out the text after this method and add or remove one extra glyph if needed. However,
- * this method calculates which are the first and last glyphs of the line (the ones that causes the
- * differences). This is a good point to check if there is problems with the text exceeding the boundaries
- * of the control when there is right to left text.
+ * @note This method starts to layout text as if it was left to right. However, it might be differences in the length
+ * of the line if it's a bidirectional one. If the paragraph is bidirectional, this method will call a function
+ * to reorder the line and recalculate its length.
*
+
* @param[in] parameters The layout parameters.
+ * @param[] bidiParameters Bidirectional info for the current line.
* @param[out] lineLayout The line layout.
- * @param[in,out] paragraphDirection in: the current paragraph's direction, out: the next paragraph's direction. Is set after a must break.
* @param[in] completelyFill Whether to completely fill the line ( even if the last word exceeds the boundaries ).
*/
- void GetLineLayoutForBox( const LayoutParameters& parameters,
+ void GetLineLayoutForBox( const Parameters& parameters,
+ LayoutBidiParameters& bidiParameters,
LineLayout& lineLayout,
- CharacterDirection& paragraphDirection,
bool completelyFill )
{
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 Character* const textBuffer = parameters.textModel->mLogicalModel->mText.Begin();
+ const Length* const charactersPerGlyphBuffer = parameters.textModel->mVisualModel->mCharactersPerGlyph.Begin();
+ const GlyphInfo* const glyphsBuffer = parameters.textModel->mVisualModel->mGlyphs.Begin();
+ const CharacterIndex* const glyphsToCharactersBuffer = parameters.textModel->mVisualModel->mGlyphsToCharacters.Begin();
+ const LineBreakInfo* const lineBreakInfoBuffer = parameters.textModel->mLogicalModel->mLineBreakInfo.Begin();
+
+ const float outlineWidth = static_cast<float>( parameters.textModel->GetOutlineWidth() );
+ const Length totalNumberOfGlyphs = parameters.textModel->mVisualModel->mGlyphs.Count();
const bool isMultiline = mLayout == MULTI_LINE_BOX;
- const GlyphIndex lastGlyphIndex = parameters.totalNumberOfGlyphs - 1u;
+ const bool isWordLaidOut = parameters.textModel->mLineWrapMode == Text::LineWrap::WORD;
+
+ // The last glyph to be laid-out.
+ const GlyphIndex lastGlyphOfParagraphPlusOne = parameters.startGlyphIndex + parameters.numberOfGlyphs;
// 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, if the width is longer than the advance,
// the difference needs to be added to the line length.
- const GlyphInfo& glyphInfo = *( parameters.glyphsBuffer + lineLayout.glyphIndex );
+
+ // Check whether the first glyph comes from a character that is shaped in multiple glyphs.
+ const Length numberOfGLyphsInGroup = GetNumberOfGlyphsOfGroup( lineLayout.glyphIndex,
+ lastGlyphOfParagraphPlusOne,
+ charactersPerGlyphBuffer );
+
+ GlyphMetrics glyphMetrics;
+ GetGlyphsMetrics( lineLayout.glyphIndex,
+ numberOfGLyphsInGroup,
+ glyphMetrics,
+ glyphsBuffer,
+ mMetrics );
// Set the direction of the first character of the line.
- lineLayout.characterIndex = *( parameters.glyphsToCharactersBuffer + lineLayout.glyphIndex );
- const CharacterDirection firstCharacterDirection = ( NULL == parameters.characterDirectionBuffer ) ? false : *( parameters.characterDirectionBuffer + lineLayout.characterIndex );
- CharacterDirection previousCharacterDirection = firstCharacterDirection;
+ lineLayout.characterIndex = *( glyphsToCharactersBuffer + lineLayout.glyphIndex );
- const float extraWidth = glyphInfo.xBearing + glyphInfo.width - glyphInfo.advance;
- float tmpExtraWidth = ( 0.f < extraWidth ) ? extraWidth : 0.f;
+ // Stores temporary line layout which has not been added to the final line layout.
+ LineLayout tmpLineLayout;
- float tmpExtraBearing = ( 0.f > glyphInfo.xBearing ) ? -glyphInfo.xBearing : 0.f;
+ // Initialize the start point.
- tmpLineLayout.length += mCursorWidth; // Added to give some space to the cursor.
+ // The initial start point is zero. However it needs a correction according the 'x' bearing of the first glyph.
+ // i.e. if the bearing of the first glyph is negative it may exceed the boundaries of the text area.
+ // It needs to add as well space for the cursor if the text is in edit mode and extra space in case the text is outlined.
+ tmpLineLayout.penX = -glyphMetrics.xBearing + mCursorWidth + outlineWidth;
// Calculate the line height if there is no characters.
- FontId lastFontId = glyphInfo.fontId;
- UpdateLineHeight( lastFontId, tmpLineLayout );
+ FontId lastFontId = glyphMetrics.fontId;
+ UpdateLineHeight( glyphMetrics, tmpLineLayout );
bool oneWordLaidOut = false;
for( GlyphIndex glyphIndex = lineLayout.glyphIndex;
- glyphIndex < parameters.totalNumberOfGlyphs;
- ++glyphIndex )
+ glyphIndex < lastGlyphOfParagraphPlusOne; )
{
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 );
+ // Check whether this glyph comes from a character that is shaped in multiple glyphs.
+ const Length numberOfGLyphsInGroup = GetNumberOfGlyphsOfGroup( glyphIndex,
+ lastGlyphOfParagraphPlusOne,
+ charactersPerGlyphBuffer );
+
+ GlyphMetrics glyphMetrics;
+ GetGlyphsMetrics( glyphIndex,
+ numberOfGLyphsInGroup,
+ glyphMetrics,
+ glyphsBuffer,
+ mMetrics );
+
+ const bool isLastGlyph = glyphIndex + numberOfGLyphsInGroup == totalNumberOfGlyphs;
// 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 )
+ if( lastFontId != glyphMetrics.fontId )
{
- UpdateLineHeight( glyphInfo.fontId, tmpLineLayout );
- lastFontId = glyphInfo.fontId;
+ UpdateLineHeight( glyphMetrics, tmpLineLayout );
+ lastFontId = glyphMetrics.fontId;
}
// 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 );
+ const Length charactersPerGlyph = *( charactersPerGlyphBuffer + glyphIndex + numberOfGLyphsInGroup - 1u );
+ const bool hasCharacters = charactersPerGlyph > 0u;
+ const CharacterIndex characterFirstIndex = *( glyphsToCharactersBuffer + glyphIndex );
+ const CharacterIndex characterLastIndex = characterFirstIndex + ( hasCharacters ? charactersPerGlyph - 1u : 0u );
// 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 );
+ const LineBreakInfo lineBreakInfo = hasCharacters ? *( lineBreakInfoBuffer + characterLastIndex ) : TextAbstraction::LINE_NO_BREAK;
// Increase the number of characters.
tmpLineLayout.numberOfCharacters += charactersPerGlyph;
// Increase the number of glyphs.
- tmpLineLayout.numberOfGlyphs++;
+ tmpLineLayout.numberOfGlyphs += numberOfGLyphsInGroup;
// Check whether is a white space.
- const Character character = *( parameters.textBuffer + characterFirstIndex );
+ const Character character = *( 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 previousTmpExtraBearing = tmpExtraBearing;
- const float previousTmpExtraWidth = tmpExtraWidth;
+ // Calculate the length of the line.
- // Get the character's direction.
- const CharacterDirection characterDirection = ( NULL == parameters.characterDirectionBuffer ) ? false : *( parameters.characterDirectionBuffer + characterFirstIndex );
+ // 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 previousTmpPenX = tmpLineLayout.penX;
+ const float previousTmpAdvance = tmpLineLayout.previousAdvance;
+ const float previousTmpLength = tmpLineLayout.length;
+ const float previousTmpWhiteSpaceLengthEndOfLine = tmpLineLayout.whiteSpaceLengthEndOfLine;
- // 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.
+ tmpLineLayout.whiteSpaceLengthEndOfLine += glyphMetrics.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;
-
- // An extra space may be added to the line for the first and last glyph of the line.
- // If the bearing of the first glyph is negative, its positive value needs to be added.
- // If the bearing plus the width of the last glyph is greater than the advance, the difference
- // needs to be added.
-
- if( characterDirection == paragraphDirection )
- {
- if( RTL == characterDirection )
- {
- // <--
- // | Rrrrr|
- // or
- // | Rllrrr|
- // or
- // |lllrrrrr|
- // | Rll|
- //
-
- tmpExtraBearing = ( 0.f > glyphInfo.xBearing ) ? -glyphInfo.xBearing : 0.f;
- }
- else // LTR
- {
- // -->
- // |lllL |
- // or
- // |llrrL |
- // or
- // |lllllrrr|
- // |rrL |
- //
-
- const float extraWidth = glyphInfo.xBearing + glyphInfo.width - glyphInfo.advance;
- tmpExtraWidth = ( 0.f < extraWidth ) ? extraWidth : 0.f;
- }
- }
- else
- {
- if( characterDirection != previousCharacterDirection )
- {
- if( RTL == characterDirection )
- {
- // -->
- // |lllR |
+ tmpLineLayout.penX += tmpLineLayout.previousAdvance + tmpLineLayout.whiteSpaceLengthEndOfLine;
+ tmpLineLayout.previousAdvance = ( glyphMetrics.advance + parameters.interGlyphExtraAdvance );
- const float extraWidth = glyphInfo.xBearing + glyphInfo.width - glyphInfo.advance;
- tmpExtraWidth = ( 0.f < extraWidth ) ? extraWidth : 0.f;
- }
- else // LTR
- {
- // <--
- // | Lrrrr|
-
- tmpExtraBearing = ( 0.f > glyphInfo.xBearing ) ? -glyphInfo.xBearing : 0.f;
- }
- }
- else if( characterDirection == firstCharacterDirection )
- {
- if( RTL == characterDirection )
- {
- // -->
- // |llllllrr|
- // |Rr |
-
- tmpExtraBearing = ( 0.f > glyphInfo.xBearing ) ? -glyphInfo.xBearing : 0.f;
- }
- else // LTR
- {
- // <--
- // |llllrrrr|
- // | llL|
-
- const float extraWidth = glyphInfo.xBearing + glyphInfo.width - glyphInfo.advance;
- tmpExtraWidth = ( 0.f < extraWidth ) ? extraWidth : 0.f;
- }
- }
- }
+ tmpLineLayout.length = std::max( tmpLineLayout.length, tmpLineLayout.penX + glyphMetrics.xBearing + glyphMetrics.width );
// Clear the white space length at the end of the line.
- tmpLineLayout.wsLengthEndOfLine = 0.f;
+ tmpLineLayout.whiteSpaceLengthEndOfLine = 0.f;
}
// Check if the accumulated length fits in the width of the box.
if( ( completelyFill || isMultiline ) && !isWhiteSpace &&
- ( tmpExtraBearing + lineLayout.length + lineLayout.wsLengthEndOfLine + tmpLineLayout.length + tmpExtraWidth > parameters.boundingBox.width ) )
+ ( tmpLineLayout.length > parameters.boundingBox.width ) )
{
// 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.
+ // The word doesn't fit in the control's width. It needs to be split by character.
if( tmpLineLayout.numberOfGlyphs > 0u )
{
tmpLineLayout.numberOfCharacters -= charactersPerGlyph;
- --tmpLineLayout.numberOfGlyphs;
- tmpLineLayout.length = previousTmpLineLength;
- tmpExtraBearing = previousTmpExtraBearing;
- tmpExtraWidth = previousTmpExtraWidth;
+ tmpLineLayout.numberOfGlyphs -= numberOfGLyphsInGroup;
+
+ tmpLineLayout.penX = previousTmpPenX;
+ tmpLineLayout.previousAdvance = previousTmpAdvance;
+ tmpLineLayout.length = previousTmpLength;
+ tmpLineLayout.whiteSpaceLengthEndOfLine = previousTmpWhiteSpaceLengthEndOfLine;
}
// Add part of the word to the line layout.
DALI_LOG_INFO( gLogFilter, Debug::Verbose, " Current word does not fit.\n" );
}
- lineLayout.extraBearing = tmpExtraBearing;
- lineLayout.extraWidth = tmpExtraWidth;
-
DALI_LOG_INFO( gLogFilter, Debug::Verbose, "<--GetLineLayoutForBox.\n" );
+ // Reorder the RTL line.
+ if( bidiParameters.isBidirectional )
+ {
+ ReorderBiDiLayout( parameters,
+ bidiParameters,
+ lineLayout,
+ lineLayout,
+ true );
+ }
+
return;
}
if( ( isMultiline || isLastGlyph ) &&
( TextAbstraction::LINE_MUST_BREAK == lineBreakInfo ) )
{
+ LineLayout currentLineLayout = lineLayout;
+
// Must break the line. Update the line layout and return.
MergeLineLayout( lineLayout, tmpLineLayout );
- // Set the next paragraph's direction.
- if( !isLastGlyph &&
- ( NULL != parameters.characterDirectionBuffer ) )
+ // Reorder the RTL line.
+ if( bidiParameters.isBidirectional )
{
- paragraphDirection = *( parameters.characterDirectionBuffer + 1u + characterLastIndex );
+ ReorderBiDiLayout( parameters,
+ bidiParameters,
+ currentLineLayout,
+ lineLayout,
+ false );
}
- lineLayout.extraBearing = tmpExtraBearing;
- lineLayout.extraWidth = tmpExtraWidth;
-
DALI_LOG_INFO( gLogFilter, Debug::Verbose, " Must break\n" );
DALI_LOG_INFO( gLogFilter, Debug::Verbose, "<--GetLineLayoutForBox\n" );
+
return;
}
if( isMultiline &&
- ( TextAbstraction::WORD_BREAK == wordBreakInfo ) )
+ ( TextAbstraction::LINE_ALLOW_BREAK == lineBreakInfo ) )
{
- oneWordLaidOut = true;
- DALI_LOG_INFO( gLogFilter, Debug::Verbose, " One word laid out\n" );
+ oneWordLaidOut = isWordLaidOut;
+ 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.
tmpLineLayout.Clear();
}
- previousCharacterDirection = characterDirection;
+ glyphIndex += numberOfGLyphsInGroup;
}
- lineLayout.extraBearing = tmpExtraBearing;
- lineLayout.extraWidth = tmpExtraWidth;
-
DALI_LOG_INFO( gLogFilter, Debug::Verbose, "<--GetLineLayoutForBox\n" );
}
void SetGlyphPositions( const GlyphInfo* const glyphsBuffer,
Length numberOfGlyphs,
- float penY,
+ float outlineWidth,
+ float interGlyphExtraAdvance,
Vector2* glyphPositionsBuffer )
{
// Traverse the glyphs and set the positions.
// so the penX position needs to be moved to the right.
const GlyphInfo& glyph = *glyphsBuffer;
- float penX = ( 0.f > glyph.xBearing ) ? -glyph.xBearing : 0.f;
+ float penX = -glyph.xBearing + mCursorWidth + outlineWidth;
for( GlyphIndex i = 0u; i < numberOfGlyphs; ++i )
{
const GlyphInfo& glyph = *( glyphsBuffer + i );
Vector2& position = *( glyphPositionsBuffer + i );
- position.x = penX + glyph.xBearing;
- position.y = penY - glyph.yBearing;
+ position.x = std::roundf( penX + glyph.xBearing );
+ position.y = -glyph.yBearing;
+
+ penX += ( glyph.advance + interGlyphExtraAdvance );
+ }
+ }
+
+ void SetGlyphPositions( const Parameters& layoutParameters,
+ Vector2* glyphPositionsBuffer,
+ LayoutBidiParameters& layoutBidiParameters,
+ const LineLayout& layout )
+ {
+ const Character* const textBuffer = layoutParameters.textModel->mLogicalModel->mText.Begin();
+ const BidirectionalLineInfoRun& bidiLine = layoutParameters.textModel->mLogicalModel->mBidirectionalLineInfo[layoutBidiParameters.bidiLineIndex];
+ const GlyphInfo* const glyphsBuffer = layoutParameters.textModel->mVisualModel->mGlyphs.Begin();
+ const GlyphIndex* const charactersToGlyphsBuffer = layoutParameters.textModel->mVisualModel->mCharactersToGlyph.Begin();
+ const Length* const glyphsPerCharacterBuffer = layoutParameters.textModel->mVisualModel->mGlyphsPerCharacter.Begin();
+
+ CharacterIndex characterLogicalIndex = 0u;
+ CharacterIndex characterVisualIndex = bidiLine.characterRun.characterIndex + *( bidiLine.visualToLogicalMap + characterLogicalIndex );
+
+ float penX = 0.f;
+ while( TextAbstraction::IsWhiteSpace( *( textBuffer + characterVisualIndex ) ) )
+ {
+ const GlyphIndex glyphIndex = *( charactersToGlyphsBuffer + characterVisualIndex );
+ const GlyphInfo& glyph = *( glyphsBuffer + glyphIndex );
+
+ Vector2& position = *( glyphPositionsBuffer + glyphIndex - layoutParameters.startGlyphIndex );
+ position.x = penX;
+ position.y = -glyph.yBearing;
penX += glyph.advance;
+
+ ++characterLogicalIndex;
+ characterVisualIndex = bidiLine.characterRun.characterIndex + *( bidiLine.visualToLogicalMap + characterLogicalIndex );
+ }
+
+ const GlyphIndex glyphIndex = *( charactersToGlyphsBuffer + characterVisualIndex );
+ const GlyphInfo& glyph = *( glyphsBuffer + glyphIndex );
+
+ penX += -glyph.xBearing;
+
+ // Traverses the characters of the right to left paragraph.
+ for( ; 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 = *( 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 = *( charactersToGlyphsBuffer + characterVisualIndex ) + index;
+
+ DALI_ASSERT_DEBUG( glyphIndex < layoutParameters.textModel->mVisualModel->mGlyphs.Count() );
+
+ const GlyphInfo& glyph = *( glyphsBuffer + glyphIndex );
+ Vector2& position = *( glyphPositionsBuffer + glyphIndex - layoutParameters.startGlyphIndex );
+
+ position.x = std::round( penX + glyph.xBearing );
+ position.y = -glyph.yBearing;
+
+ penX += ( glyph.advance + layoutParameters.interGlyphExtraAdvance );
+ }
+ }
+ }
+
+ /**
+ * @brief Resizes the line buffer.
+ *
+ * @param[in,out] lines The vector of lines. Used when the layout is created from scratch.
+ * @param[in,out] newLines The vector of lines used instead of @p lines when the layout is updated.
+ * @param[in,out] linesCapacity The capacity of the vector (either lines or newLines).
+ * @param[in] updateCurrentBuffer Whether the layout is updated.
+ *
+ * @return Pointer to either lines or newLines.
+ */
+ LineRun* ResizeLinesBuffer( Vector<LineRun>& lines,
+ Vector<LineRun>& newLines,
+ Length& linesCapacity,
+ bool updateCurrentBuffer )
+ {
+ LineRun* linesBuffer = nullptr;
+ // Reserve more space for the next lines.
+ linesCapacity *= 2u;
+ if( updateCurrentBuffer )
+ {
+ newLines.Resize( linesCapacity );
+ linesBuffer = newLines.Begin();
+ }
+ else
+ {
+ lines.Resize( linesCapacity );
+ linesBuffer = lines.Begin();
+ }
+
+ return linesBuffer;
+ }
+
+ /**
+ * Ellipsis a line if it exceeds the width's of the bounding box.
+ *
+ * @param[in] layoutParameters The parameters needed to layout the text.
+ * @param[in] layout The line layout.
+ * @param[in,out] layoutSize The text's layout size.
+ * @param[in,out] linesBuffer Pointer to the line's buffer.
+ * @param[in,out] glyphPositionsBuffer Pointer to the position's buffer.
+ * @param[in,out] numberOfLines The number of laid-out lines.
+ * @param[in] penY The vertical layout position.
+ * @param[in] currentParagraphDirection The current paragraph's direction.
+ * @param[in,out] isAutoScrollEnabled If the isAutoScrollEnabled is true and the height of the text exceeds the boundaries of the control the text is elided and the isAutoScrollEnabled is set to false to disable the autoscroll
+ *
+ * return Whether the line is ellipsized.
+ */
+ bool EllipsisLine( const Parameters& layoutParameters,
+ LayoutBidiParameters& layoutBidiParameters,
+ const LineLayout& layout,
+ Size& layoutSize,
+ LineRun* linesBuffer,
+ Vector2* glyphPositionsBuffer,
+ Length& numberOfLines,
+ float penY,
+ bool& isAutoScrollEnabled )
+ {
+ const bool ellipsis = isAutoScrollEnabled ? ( penY - layout.descender > layoutParameters.boundingBox.height ) :
+ ( ( penY - layout.descender > layoutParameters.boundingBox.height ) ||
+ ( ( mLayout == SINGLE_LINE_BOX ) &&
+ ( layout.length > layoutParameters.boundingBox.width ) ) );
+
+ if( ellipsis )
+ {
+ isAutoScrollEnabled = false;
+ // 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.
+
+ LineRun* lineRun = nullptr;
+ LineLayout ellipsisLayout;
+ if( 0u != numberOfLines )
+ {
+ // Get the last line and layout it again with the 'completelyFill' flag to true.
+ lineRun = linesBuffer + ( numberOfLines - 1u );
+
+ penY -= layout.ascender - lineRun->descender + lineRun->lineSpacing;
+
+ ellipsisLayout.glyphIndex = lineRun->glyphRun.glyphIndex;
+ }
+ else
+ {
+ // At least there is space reserved for one line.
+ lineRun = linesBuffer;
+
+ lineRun->glyphRun.glyphIndex = 0u;
+ ellipsisLayout.glyphIndex = 0u;
+
+ ++numberOfLines;
+ }
+
+ GetLineLayoutForBox( layoutParameters,
+ layoutBidiParameters,
+ ellipsisLayout,
+ true );
+
+ lineRun->glyphRun.numberOfGlyphs = ellipsisLayout.numberOfGlyphs;
+ lineRun->characterRun.characterIndex = ellipsisLayout.characterIndex;
+ lineRun->characterRun.numberOfCharacters = ellipsisLayout.numberOfCharacters;
+ lineRun->width = ellipsisLayout.length;
+ lineRun->extraLength = std::ceil( ellipsisLayout.whiteSpaceLengthEndOfLine );
+ lineRun->ascender = ellipsisLayout.ascender;
+ lineRun->descender = ellipsisLayout.descender;
+ lineRun->ellipsis = true;
+
+ layoutSize.width = layoutParameters.boundingBox.width;
+ if( layoutSize.height < Math::MACHINE_EPSILON_1000 )
+ {
+ layoutSize.height += ( lineRun->ascender + -lineRun->descender ) + lineRun->lineSpacing;
+ }
+
+ const GlyphInfo* const glyphsBuffer = layoutParameters.textModel->mVisualModel->mGlyphs.Begin();
+ const float outlineWidth = static_cast<float>( layoutParameters.textModel->GetOutlineWidth() );
+
+ const Vector<BidirectionalLineInfoRun>& bidirectionalLinesInfo = layoutParameters.textModel->mLogicalModel->mBidirectionalLineInfo;
+
+ if( layoutBidiParameters.isBidirectional )
+ {
+ layoutBidiParameters.bidiLineIndex = 0u;
+ for( Vector<BidirectionalLineInfoRun>::ConstIterator it = bidirectionalLinesInfo.Begin(),
+ endIt = bidirectionalLinesInfo.End();
+ it != endIt;
+ ++it, ++layoutBidiParameters.bidiLineIndex )
+ {
+ const BidirectionalLineInfoRun& run = *it;
+
+ if( ellipsisLayout.characterIndex == run.characterRun.characterIndex )
+ {
+ // Found where to insert the bidi line info.
+ break;
+ }
+ }
+ }
+
+ const BidirectionalLineInfoRun* const bidirectionalLineInfo = ( layoutBidiParameters.isBidirectional && !bidirectionalLinesInfo.Empty() ) ? &bidirectionalLinesInfo[layoutBidiParameters.bidiLineIndex] : nullptr;
+
+ if( ( nullptr != bidirectionalLineInfo ) &&
+ !bidirectionalLineInfo->isIdentity &&
+ ( ellipsisLayout.characterIndex == bidirectionalLineInfo->characterRun.characterIndex ) )
+ {
+ lineRun->direction = RTL;
+ SetGlyphPositions( layoutParameters,
+ glyphPositionsBuffer,
+ layoutBidiParameters,
+ ellipsisLayout );
+ }
+ else
+ {
+ lineRun->direction = LTR;
+ SetGlyphPositions( glyphsBuffer + lineRun->glyphRun.glyphIndex,
+ ellipsisLayout.numberOfGlyphs,
+ outlineWidth,
+ layoutParameters.interGlyphExtraAdvance,
+ glyphPositionsBuffer + lineRun->glyphRun.glyphIndex - layoutParameters.startGlyphIndex );
+ }
+ }
+
+ return ellipsis;
+ }
+
+ /**
+ * @brief Updates the text layout with a new laid-out line.
+ *
+ * @param[in] layoutParameters The parameters needed to layout the text.
+ * @param[in] layout The line layout.
+ * @param[in,out] layoutSize The text's layout size.
+ * @param[in,out] linesBuffer Pointer to the line's buffer.
+ * @param[in] index Index to the vector of glyphs.
+ * @param[in,out] numberOfLines The number of laid-out lines.
+ * @param[in] isLastLine Whether the laid-out line is the last one.
+ */
+ void UpdateTextLayout( const Parameters& layoutParameters,
+ const LineLayout& layout,
+ Size& layoutSize,
+ LineRun* linesBuffer,
+ GlyphIndex index,
+ Length& numberOfLines,
+ bool isLastLine )
+ {
+ LineRun& lineRun = *( linesBuffer + numberOfLines );
+ ++numberOfLines;
+
+ lineRun.glyphRun.glyphIndex = index;
+ lineRun.glyphRun.numberOfGlyphs = layout.numberOfGlyphs;
+ lineRun.characterRun.characterIndex = layout.characterIndex;
+ lineRun.characterRun.numberOfCharacters = layout.numberOfCharacters;
+ lineRun.lineSpacing = mDefaultLineSpacing;
+
+ if( isLastLine && !layoutParameters.isLastNewParagraph )
+ {
+ lineRun.width = layout.length;
+ if( LTR == layout.direction )
+ {
+ lineRun.width += layout.whiteSpaceLengthEndOfLine;
+ lineRun.extraLength = 0.f;
+ }
+ else
+ {
+ lineRun.extraLength = layout.whiteSpaceLengthEndOfLine;
+ }
+ }
+ else
+ {
+ lineRun.width = layout.length;
+ lineRun.extraLength = std::ceil( layout.whiteSpaceLengthEndOfLine );
+ }
+
+ // Rounds upward to avoid a non integer size.
+ lineRun.width = std::ceil( lineRun.width );
+
+ lineRun.ascender = layout.ascender;
+ lineRun.descender = layout.descender;
+ lineRun.direction = layout.direction;
+ lineRun.ellipsis = false;
+
+ // Update the actual size.
+ if( lineRun.width > layoutSize.width )
+ {
+ layoutSize.width = lineRun.width;
+ }
+
+ layoutSize.height += ( lineRun.ascender + -lineRun.descender ) + lineRun.lineSpacing;
+ }
+
+ /**
+ * @brief Updates the text layout with the last laid-out line.
+ *
+ * @param[in] layoutParameters The parameters needed to layout the text.
+ * @param[in] characterIndex The character index of the line.
+ * @param[in] glyphIndex The glyph index of the line.
+ * @param[in,out] layoutSize The text's layout size.
+ * @param[in,out] linesBuffer Pointer to the line's buffer.
+ * @param[in,out] numberOfLines The number of laid-out lines.
+ */
+ void UpdateTextLayout( const Parameters& layoutParameters,
+ CharacterIndex characterIndex,
+ GlyphIndex glyphIndex,
+ Size& layoutSize,
+ LineRun* linesBuffer,
+ Length& numberOfLines )
+ {
+ const Vector<GlyphInfo>& glyphs = layoutParameters.textModel->mVisualModel->mGlyphs;
+
+ // Need to add a new line with no characters but with height to increase the layoutSize.height
+ const GlyphInfo& glyphInfo = glyphs[glyphs.Count() - 1u];
+
+ Text::FontMetrics fontMetrics;
+ if( 0u != glyphInfo.fontId )
+ {
+ mMetrics->GetFontMetrics( glyphInfo.fontId, fontMetrics );
}
+
+ LineRun& lineRun = *( linesBuffer + numberOfLines );
+ ++numberOfLines;
+
+ lineRun.glyphRun.glyphIndex = glyphIndex;
+ lineRun.glyphRun.numberOfGlyphs = 0u;
+ lineRun.characterRun.characterIndex = characterIndex;
+ lineRun.characterRun.numberOfCharacters = 0u;
+ lineRun.width = 0.f;
+ lineRun.ascender = fontMetrics.ascender;
+ lineRun.descender = fontMetrics.descender;
+ lineRun.extraLength = 0.f;
+ lineRun.alignmentOffset = 0.f;
+ lineRun.direction = LTR;
+ lineRun.ellipsis = false;
+ lineRun.lineSpacing = mDefaultLineSpacing;
+
+ layoutSize.height += ( lineRun.ascender + -lineRun.descender ) + lineRun.lineSpacing;
}
- bool LayoutText( const LayoutParameters& layoutParameters,
- Vector<Vector2>& glyphPositions,
- Vector<LineRun>& lines,
- Size& actualSize )
+ /**
+ * @brief Updates the text's layout size adding the size of the previously laid-out lines.
+ *
+ * @param[in] lines The vector of lines (before the new laid-out lines are inserted).
+ * @param[in,out] layoutSize The text's layout size.
+ */
+ void UpdateLayoutSize( const Vector<LineRun>& lines,
+ Size& layoutSize )
+ {
+ for( Vector<LineRun>::ConstIterator it = lines.Begin(),
+ endIt = lines.End();
+ it != endIt;
+ ++it )
+ {
+ const LineRun& line = *it;
+
+ if( line.width > layoutSize.width )
+ {
+ layoutSize.width = line.width;
+ }
+
+ layoutSize.height += ( line.ascender + -line.descender ) + line.lineSpacing;
+ }
+ }
+
+ /**
+ * @brief Updates the indices of the character and glyph runs of the lines before the new lines are inserted.
+ *
+ * @param[in] layoutParameters The parameters needed to layout the text.
+ * @param[in,out] lines The vector of lines (before the new laid-out lines are inserted).
+ * @param[in] characterOffset The offset to be added to the runs of characters.
+ * @param[in] glyphOffset The offset to be added to the runs of glyphs.
+ */
+ void UpdateLineIndexOffsets( const Parameters& layoutParameters,
+ Vector<LineRun>& lines,
+ Length characterOffset,
+ Length glyphOffset )
+ {
+ // Update the glyph and character runs.
+ for( Vector<LineRun>::Iterator it = lines.Begin() + layoutParameters.startLineIndex,
+ endIt = lines.End();
+ it != endIt;
+ ++it )
+ {
+ LineRun& line = *it;
+
+ line.glyphRun.glyphIndex = glyphOffset;
+ line.characterRun.characterIndex = characterOffset;
+
+ glyphOffset += line.glyphRun.numberOfGlyphs;
+ characterOffset += line.characterRun.numberOfCharacters;
+ }
+ }
+
+ bool LayoutText( Parameters& layoutParameters,
+ Size& layoutSize,
+ bool elideTextEnabled,
+ bool& isAutoScrollEnabled )
{
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 );
- // Set the first paragraph's direction.
- CharacterDirection paragraphDirection = ( NULL != layoutParameters.characterDirectionBuffer ) ? *layoutParameters.characterDirectionBuffer : !RTL;
+ Vector<LineRun>& lines = layoutParameters.textModel->mVisualModel->mLines;
+
+ if( 0u == layoutParameters.numberOfGlyphs )
+ {
+ // Add an extra line if the last character is a new paragraph character and the last line doesn't have zero characters.
+ if( layoutParameters.isLastNewParagraph )
+ {
+ Length numberOfLines = lines.Count();
+ if( 0u != numberOfLines )
+ {
+ const LineRun& lastLine = *( lines.End() - 1u );
+
+ if( 0u != lastLine.characterRun.numberOfCharacters )
+ {
+ // Need to add a new line with no characters but with height to increase the layoutSize.height
+ LineRun newLine;
+ Initialize( newLine );
+ lines.PushBack( newLine );
+
+ UpdateTextLayout( layoutParameters,
+ lastLine.characterRun.characterIndex + lastLine.characterRun.numberOfCharacters,
+ lastLine.glyphRun.glyphIndex + lastLine.glyphRun.numberOfGlyphs,
+ layoutSize,
+ lines.Begin(),
+ numberOfLines );
+ }
+ }
+ }
+
+ // Calculates the layout size.
+ UpdateLayoutSize( lines,
+ layoutSize );
+
+ // Rounds upward to avoid a non integer size.
+ layoutSize.height = std::ceil( layoutSize.height );
+
+ // Nothing else do if there are no glyphs to layout.
+ return false;
+ }
+
+ const GlyphIndex lastGlyphPlusOne = layoutParameters.startGlyphIndex + layoutParameters.numberOfGlyphs;
+ const Length totalNumberOfGlyphs = layoutParameters.textModel->mVisualModel->mGlyphs.Count();
+ Vector<Vector2>& glyphPositions = layoutParameters.textModel->mVisualModel->mGlyphPositions;
+
+ // In a previous layout, an extra line with no characters may have been added if the text ended with a new paragraph character.
+ // This extra line needs to be removed.
+ if( 0u != lines.Count() )
+ {
+ Vector<LineRun>::Iterator lastLine = lines.End() - 1u;
+
+ if( ( 0u == lastLine->characterRun.numberOfCharacters ) &&
+ ( lastGlyphPlusOne == totalNumberOfGlyphs ) )
+ {
+ lines.Remove( lastLine );
+ }
+ }
+
+ // Retrieve BiDi info.
+ const bool hasBidiParagraphs = !layoutParameters.textModel->mLogicalModel->mBidirectionalParagraphInfo.Empty();
+
+ const CharacterIndex* const glyphsToCharactersBuffer = hasBidiParagraphs ? layoutParameters.textModel->mVisualModel->mGlyphsToCharacters.Begin() : nullptr;
+ const Vector<BidirectionalParagraphInfoRun>& bidirectionalParagraphsInfo = layoutParameters.textModel->mLogicalModel->mBidirectionalParagraphInfo;
+ const Vector<BidirectionalLineInfoRun>& bidirectionalLinesInfo = layoutParameters.textModel->mLogicalModel->mBidirectionalLineInfo;
+
+ // Set the layout bidirectional paramters.
+ LayoutBidiParameters layoutBidiParameters;
+
+ // Whether the layout is being updated or set from scratch.
+ const bool updateCurrentBuffer = layoutParameters.numberOfGlyphs < totalNumberOfGlyphs;
+
+ Vector2* glyphPositionsBuffer = nullptr;
+ Vector<Vector2> newGlyphPositions;
+
+ LineRun* linesBuffer = nullptr;
+ Vector<LineRun> newLines;
+
+ // Estimate the number of lines.
+ Length linesCapacity = std::max( 1u, layoutParameters.estimatedNumberOfLines );
+ Length numberOfLines = 0u;
+
+ if( updateCurrentBuffer )
+ {
+ newGlyphPositions.Resize( layoutParameters.numberOfGlyphs );
+ glyphPositionsBuffer = newGlyphPositions.Begin();
+
+ newLines.Resize( linesCapacity );
+ linesBuffer = newLines.Begin();
+ }
+ else
+ {
+ glyphPositionsBuffer = glyphPositions.Begin();
+
+ lines.Resize( linesCapacity );
+ linesBuffer = lines.Begin();
+ }
- float penY = 0.f;
- for( GlyphIndex index = 0u; index < layoutParameters.totalNumberOfGlyphs; )
+ float penY = CalculateLineOffset( lines,
+ layoutParameters.startLineIndex );
+ for( GlyphIndex index = layoutParameters.startGlyphIndex; index < lastGlyphPlusOne; )
{
- CharacterDirection currentParagraphDirection = paragraphDirection;
+ layoutBidiParameters.Clear();
+
+ if( hasBidiParagraphs )
+ {
+ const CharacterIndex startCharacterIndex = *( glyphsToCharactersBuffer + index );
+
+ for( Vector<BidirectionalParagraphInfoRun>::ConstIterator it = bidirectionalParagraphsInfo.Begin(),
+ endIt = bidirectionalParagraphsInfo.End();
+ it != endIt;
+ ++it, ++layoutBidiParameters.bidiParagraphIndex )
+ {
+ const BidirectionalParagraphInfoRun& run = *it;
+
+ const CharacterIndex lastCharacterIndex = run.characterRun.characterIndex + run.characterRun.numberOfCharacters;
+
+ if( lastCharacterIndex <= startCharacterIndex )
+ {
+ // Do not process, the paragraph has already been processed.
+ continue;
+ }
+
+ if( startCharacterIndex >= run.characterRun.characterIndex && startCharacterIndex < lastCharacterIndex )
+ {
+ layoutBidiParameters.paragraphDirection = run.direction;
+ layoutBidiParameters.isBidirectional = true;
+ }
+
+ // Has already been found.
+ break;
+ }
+
+ if( layoutBidiParameters.isBidirectional )
+ {
+ for( Vector<BidirectionalLineInfoRun>::ConstIterator it = bidirectionalLinesInfo.Begin(),
+ endIt = bidirectionalLinesInfo.End();
+ it != endIt;
+ ++it, ++layoutBidiParameters.bidiLineIndex )
+ {
+ const BidirectionalLineInfoRun& run = *it;
+
+ const CharacterIndex lastCharacterIndex = run.characterRun.characterIndex + run.characterRun.numberOfCharacters;
+
+ if( lastCharacterIndex <= startCharacterIndex )
+ {
+ // skip
+ continue;
+ }
+
+ if( startCharacterIndex < lastCharacterIndex )
+ {
+ // Found where to insert the bidi line info.
+ break;
+ }
+ }
+ }
+ }
+
+ CharacterDirection currentParagraphDirection = layoutBidiParameters.paragraphDirection;
// Get the layout for the line.
LineLayout layout;
+ layout.direction = layoutBidiParameters.paragraphDirection;
layout.glyphIndex = index;
GetLineLayoutForBox( layoutParameters,
+ layoutBidiParameters,
layout,
- paragraphDirection,
false );
DALI_LOG_INFO( gLogFilter, Debug::Verbose, " glyph index %d\n", layout.glyphIndex );
{
// The width is too small and no characters are laid-out.
DALI_LOG_INFO( gLogFilter, Debug::Verbose, "<--LayoutText width too small!\n\n" );
+
+ lines.Resize( numberOfLines );
+
+ // Rounds upward to avoid a non integer size.
+ layoutSize.height = std::ceil( layoutSize.height );
+
return false;
}
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.extraBearing + layout.length + layout.extraWidth > 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.
+ bool ellipsis = false;
+ if( elideTextEnabled )
+ {
+ layoutBidiParameters.paragraphDirection = currentParagraphDirection;
+
+ // Does the ellipsis of the last line.
+ ellipsis = EllipsisLine( layoutParameters,
+ layoutBidiParameters,
+ layout,
+ layoutSize,
+ linesBuffer,
+ glyphPositionsBuffer,
+ numberOfLines,
+ penY,
+ isAutoScrollEnabled );
+ }
- const Length numberOfLines = lines.Count();
+ if( ellipsis )
+ {
+ // No more lines to layout.
+ break;
+ }
+ else
+ {
+ // Whether the last line has been laid-out.
+ const bool isLastLine = index + layout.numberOfGlyphs == totalNumberOfGlyphs;
- LineRun lineRun;
- LineLayout ellipsisLayout;
- if( 0u != numberOfLines )
+ if( numberOfLines == linesCapacity )
{
- // 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.glyphRun.glyphIndex;
- }
- else
- {
- lineRun.glyphRun.glyphIndex = 0u;
- ellipsisLayout.glyphIndex = 0u;
+ // Reserve more space for the next lines.
+ linesBuffer = ResizeLinesBuffer( lines,
+ newLines,
+ linesCapacity,
+ updateCurrentBuffer );
}
- GetLineLayoutForBox( layoutParameters,
- ellipsisLayout,
- currentParagraphDirection,
- true );
-
- lineRun.glyphRun.numberOfGlyphs = ellipsisLayout.numberOfGlyphs;
- lineRun.characterRun.characterIndex = ellipsisLayout.characterIndex;
- lineRun.characterRun.numberOfCharacters = ellipsisLayout.numberOfCharacters;
- lineRun.width = ellipsisLayout.length;
- lineRun.extraLength = ( ellipsisLayout.wsLengthEndOfLine > 0.f ) ? ellipsisLayout.wsLengthEndOfLine - ellipsisLayout.extraWidth : 0.f;
- lineRun.ascender = ellipsisLayout.ascender;
- lineRun.descender = ellipsisLayout.descender;
- lineRun.direction = !RTL;
- lineRun.ellipsis = true;
+ // Updates the current text's layout with the line's layout.
+ UpdateTextLayout( layoutParameters,
+ layout,
+ layoutSize,
+ linesBuffer,
+ index,
+ numberOfLines,
+ isLastLine );
- actualSize.width = layoutParameters.boundingBox.width;
- actualSize.height += ( lineRun.ascender + -lineRun.descender );
+ const GlyphIndex nextIndex = index + layout.numberOfGlyphs;
- SetGlyphPositions( layoutParameters.glyphsBuffer + lineRun.glyphRun.glyphIndex,
- ellipsisLayout.numberOfGlyphs,
- penY,
- glyphPositions.Begin() + lineRun.glyphRun.glyphIndex );
-
- if( 0u != numberOfLines )
- {
- // Set the last line with the ellipsis layout.
- *( lines.Begin() + ( numberOfLines - 1u ) ) = lineRun;
- }
- else
+ if( ( nextIndex == totalNumberOfGlyphs ) &&
+ layoutParameters.isLastNewParagraph &&
+ ( mLayout == MULTI_LINE_BOX ) )
{
- // Push the line.
- lines.PushBack( lineRun );
- }
+ // The last character of the text is a new paragraph character.
+ // An extra line with no characters is added to increase the text's height
+ // in order to place the cursor.
- break;
- }
- else
- {
- const bool isLastLine = index + layout.numberOfGlyphs == layoutParameters.totalNumberOfGlyphs;
-
- LineRun lineRun;
- lineRun.glyphRun.glyphIndex = index;
- lineRun.glyphRun.numberOfGlyphs = layout.numberOfGlyphs;
- lineRun.characterRun.characterIndex = layout.characterIndex;
- lineRun.characterRun.numberOfCharacters = layout.numberOfCharacters;
- if( isLastLine && !layoutParameters.isLastNewParagraph )
- {
- const float width = layout.extraBearing + layout.length + layout.extraWidth + layout.wsLengthEndOfLine;
- if( MULTI_LINE_BOX == mLayout )
+ if( numberOfLines == linesCapacity )
{
- lineRun.width = ( width > layoutParameters.boundingBox.width ) ? layoutParameters.boundingBox.width : width;
- }
- else
- {
- lineRun.width = width;
+ // Reserve more space for the next lines.
+ linesBuffer = ResizeLinesBuffer( lines,
+ newLines,
+ linesCapacity,
+ updateCurrentBuffer );
}
- lineRun.extraLength = 0.f;
- }
- else
- {
- lineRun.width = layout.extraBearing + layout.length + layout.extraWidth;
- lineRun.extraLength = ( layout.wsLengthEndOfLine > 0.f ) ? layout.wsLengthEndOfLine - layout.extraWidth : 0.f;
- }
- lineRun.ascender = layout.ascender;
- lineRun.descender = layout.descender;
- lineRun.direction = !RTL;
- lineRun.ellipsis = false;
+ UpdateTextLayout( layoutParameters,
+ layout.characterIndex + layout.numberOfCharacters,
+ index + layout.numberOfGlyphs,
+ layoutSize,
+ linesBuffer,
+ numberOfLines );
+ } // whether to add a last line.
+
+ const GlyphInfo* const glyphsBuffer = layoutParameters.textModel->mVisualModel->mGlyphs.Begin();
+ const float outlineWidth = static_cast<float>( layoutParameters.textModel->GetOutlineWidth() );
- lines.PushBack( lineRun );
+ const BidirectionalLineInfoRun* const bidirectionalLineInfo = ( layoutBidiParameters.isBidirectional && !bidirectionalLinesInfo.Empty() ) ? &bidirectionalLinesInfo[layoutBidiParameters.bidiLineIndex] : nullptr;
- // Update the actual size.
- if( lineRun.width > actualSize.width )
+ if( ( nullptr != bidirectionalLineInfo ) &&
+ !bidirectionalLineInfo->isIdentity &&
+ ( layout.characterIndex == bidirectionalLineInfo->characterRun.characterIndex ) )
{
- actualSize.width = lineRun.width;
+ SetGlyphPositions( layoutParameters,
+ glyphPositionsBuffer,
+ layoutBidiParameters,
+ layout );
}
+ else
+ {
- actualSize.height += ( lineRun.ascender + -lineRun.descender );
-
- SetGlyphPositions( layoutParameters.glyphsBuffer + index,
- layout.numberOfGlyphs,
- penY,
- glyphPositions.Begin() + index );
+ // Sets the positions of the glyphs.
+ SetGlyphPositions( glyphsBuffer + index,
+ layout.numberOfGlyphs,
+ outlineWidth,
+ layoutParameters.interGlyphExtraAdvance,
+ glyphPositionsBuffer + index - layoutParameters.startGlyphIndex );
+ }
- penY += -layout.descender;
+ // Updates the vertical pen's position.
+ penY += -layout.descender + layout.lineSpacing + mDefaultLineSpacing;
// Increase the glyph index.
- index += layout.numberOfGlyphs;
-
- if( isLastLine &&
- layoutParameters.isLastNewParagraph &&
- ( mLayout == MULTI_LINE_BOX ) )
- {
- // Need to add a new line with no characters but with height to increase the actualSize.height
- const GlyphInfo& glyphInfo = *( layoutParameters.glyphsBuffer + layoutParameters.totalNumberOfGlyphs - 1u );
-
- Text::FontMetrics fontMetrics;
- mMetrics->GetFontMetrics( glyphInfo.fontId, fontMetrics );
-
- LineRun lineRun;
- lineRun.glyphRun.glyphIndex = 0u;
- lineRun.glyphRun.numberOfGlyphs = 0u;
- lineRun.characterRun.characterIndex = 0u;
- lineRun.characterRun.numberOfCharacters = 0u;
- lineRun.width = 0.f;
- lineRun.ascender = fontMetrics.ascender;
- lineRun.descender = fontMetrics.descender;
- lineRun.extraLength = 0.f;
- lineRun.alignmentOffset = 0.f;
- lineRun.direction = !RTL;
- lineRun.ellipsis = false;
-
- actualSize.height += ( lineRun.ascender + -lineRun.descender );
-
- lines.PushBack( lineRun );
- }
- }
+ index = nextIndex;
+ } // no ellipsis
} // end for() traversing glyphs.
- 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 )
+ if( updateCurrentBuffer )
{
- const BidirectionalLineInfoRun& bidiLine = *( layoutParameters.lineBidirectionalInfoRunsBuffer + lineIndex );
-
- const CharacterIndex characterVisualIndex = bidiLine.characterRun.characterIndex + *bidiLine.visualToLogicalMap;
- const GlyphInfo& glyph = *( layoutParameters.glyphsBuffer + *( layoutParameters.charactersToGlyphsBuffer + characterVisualIndex ) );
+ glyphPositions.Insert( glyphPositions.Begin() + layoutParameters.startGlyphIndex,
+ newGlyphPositions.Begin(),
+ newGlyphPositions.End() );
+ glyphPositions.Resize( totalNumberOfGlyphs );
- float penX = ( 0.f > glyph.xBearing ) ? -glyph.xBearing : 0.f;
+ newLines.Resize( numberOfLines );
- Vector2* glyphPositionsBuffer = glyphPositions.Begin();
+ // Current text's layout size adds only the newly laid-out lines.
+ // Updates the layout size with the previously laid-out lines.
+ UpdateLayoutSize( lines,
+ layoutSize );
- // Traverses the characters of the right to left paragraph.
- for( CharacterIndex characterLogicalIndex = 0u;
- characterLogicalIndex < bidiLine.characterRun.numberOfCharacters;
- ++characterLogicalIndex )
+ if( 0u != newLines.Count() )
{
- // Convert the character in the logical order into the character in the visual order.
- const CharacterIndex characterVisualIndex = bidiLine.characterRun.characterIndex + *( bidiLine.visualToLogicalMap + characterLogicalIndex );
+ const LineRun& lastLine = *( newLines.End() - 1u );
- // Get the number of glyphs of the character.
- const Length numberOfGlyphs = *( layoutParameters.glyphsPerCharacterBuffer + characterVisualIndex );
+ const Length characterOffset = lastLine.characterRun.characterIndex + lastLine.characterRun.numberOfCharacters;
+ const Length glyphOffset = lastLine.glyphRun.glyphIndex + lastLine.glyphRun.numberOfGlyphs;
- 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 );
+ // Update the indices of the runs before the new laid-out lines are inserted.
+ UpdateLineIndexOffsets( layoutParameters,
+ lines,
+ characterOffset,
+ glyphOffset );
- const GlyphInfo& glyph = *( layoutParameters.glyphsBuffer + glyphIndex );
- Vector2& position = *( glyphPositionsBuffer + glyphIndex );
-
- position.x = penX + glyph.xBearing;
- penX += glyph.advance;
- }
+ // Insert the lines.
+ lines.Insert( lines.Begin() + layoutParameters.startLineIndex,
+ newLines.Begin(),
+ newLines.End() );
}
}
+ else
+ {
+ lines.Resize( numberOfLines );
+ }
+
+ // Rounds upward to avoid a non integer size.
+ layoutSize.height = std::ceil( layoutSize.height );
+
+ DALI_LOG_INFO( gLogFilter, Debug::Verbose, "<--LayoutText\n\n" );
+
+ return true;
}
- void Align( const Size& layoutSize,
- Vector<LineRun>& lines )
+ void Align( const Size& size,
+ CharacterIndex startIndex,
+ Length numberOfCharacters,
+ Text::HorizontalAlignment::Type horizontalAlignment,
+ Vector<LineRun>& lines,
+ float& alignmentOffset,
+ Dali::LayoutDirection::Type layoutDirection,
+ bool matchSystemLanguageDirection )
{
- // Traverse all lines and align the glyphs.
+ const CharacterIndex lastCharacterPlusOne = startIndex + numberOfCharacters;
+ alignmentOffset = MAX_FLOAT;
+ // 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,
+ if( line.characterRun.characterIndex < startIndex )
+ {
+ // Do not align lines which have already been aligned.
+ continue;
+ }
+
+ if( line.characterRun.characterIndex > lastCharacterPlusOne )
+ {
+ // Do not align lines beyond the last laid-out character.
+ break;
+ }
+
+ if( line.characterRun.characterIndex == lastCharacterPlusOne && !isEmptyLineAtLast( lines, it ) )
+ {
+ // Do not align lines beyond the last laid-out character unless the line is last and empty.
+ break;
+ }
+
+ // Calculate the line's alignment offset accordingly with the align option,
+ // the box width, line length, and the paragraph's direction.
+ CalculateHorizontalAlignment( size.width,
+ horizontalAlignment,
line,
- isLastLine );
+ layoutDirection,
+ matchSystemLanguageDirection );
+
+ // Updates the alignment offset.
+ alignmentOffset = std::min( alignmentOffset, line.alignmentOffset );
}
}
void CalculateHorizontalAlignment( float boxWidth,
+ HorizontalAlignment::Type horizontalAlignment,
LineRun& line,
- bool isLastLine )
+ Dali::LayoutDirection::Type layoutDirection,
+ bool matchSystemLanguageDirection )
{
line.alignmentOffset = 0.f;
- const bool isRTL = RTL == line.direction;
+ const bool isLineRTL = RTL == line.direction;
+
+ // Whether to swap the alignment.
+ // Swap if the line is RTL and is not required to match the direction of the system's language or if it's required to match the direction of the system's language and it's RTL.
+ bool isLayoutRTL = isLineRTL;
float lineLength = line.width;
- HorizontalAlignment alignment = mHorizontalAlignment;
- if( isRTL &&
- ( HORIZONTAL_ALIGN_CENTER != alignment ) )
+ // match align for system language direction
+ if( matchSystemLanguageDirection )
{
- if( HORIZONTAL_ALIGN_BEGIN == alignment )
- {
- alignment = HORIZONTAL_ALIGN_END;
- }
- else
- {
- alignment = HORIZONTAL_ALIGN_BEGIN;
- }
+ // Swap the alignment type if the line is right to left.
+ isLayoutRTL = layoutDirection == LayoutDirection::RIGHT_TO_LEFT;
}
-
- switch( alignment )
+ // Calculate the horizontal line offset.
+ switch( horizontalAlignment )
{
- case HORIZONTAL_ALIGN_BEGIN:
+ case HorizontalAlignment::BEGIN:
{
- line.alignmentOffset = 0.f;
+ if( isLayoutRTL )
+ {
+ if( isLineRTL )
+ {
+ lineLength += line.extraLength;
+ }
- if( isRTL )
+ line.alignmentOffset = boxWidth - lineLength;
+ }
+ else
{
- // 'Remove' the white spaces at the end of the line (which are at the beginning in visual order)
- line.alignmentOffset -= line.extraLength;
+ line.alignmentOffset = 0.f;
- if( isLastLine )
+ if( isLineRTL )
{
- line.alignmentOffset += std::min( line.extraLength, boxWidth - lineLength );
+ // 'Remove' the white spaces at the end of the line (which are at the beginning in visual order)
+ line.alignmentOffset -= line.extraLength;
}
}
break;
}
- case HORIZONTAL_ALIGN_CENTER:
+ case HorizontalAlignment::CENTER:
{
- if( isLastLine && !isRTL )
- {
- lineLength += line.extraLength;
- if( lineLength > boxWidth )
- {
- lineLength = boxWidth;
- line.alignmentOffset = 0.f;
- break;
- }
- }
-
line.alignmentOffset = 0.5f * ( boxWidth - lineLength );
- if( isRTL )
+ if( isLineRTL )
{
line.alignmentOffset -= line.extraLength;
-
- if( isLastLine )
- {
- line.alignmentOffset += 0.5f * std::min( line.extraLength, boxWidth - lineLength );
- }
}
- line.alignmentOffset = floorf( line.alignmentOffset ); // try to avoid pixel alignment.
+ line.alignmentOffset = std::floor( line.alignmentOffset ); // floor() avoids pixel alignment issues.
break;
}
- case HORIZONTAL_ALIGN_END:
+ case HorizontalAlignment::END:
{
- if( isLastLine && !isRTL )
+ if( isLayoutRTL )
{
- lineLength += line.extraLength;
- if( lineLength > boxWidth )
+ line.alignmentOffset = 0.f;
+
+ if( isLineRTL )
{
- line.alignmentOffset = 0.f;
- break;
+ // 'Remove' the white spaces at the end of the line (which are at the beginning in visual order)
+ line.alignmentOffset -= line.extraLength;
}
}
-
- if( isRTL )
+ else
{
- lineLength += line.extraLength;
- }
+ if( isLineRTL )
+ {
+ lineLength += line.extraLength;
+ }
- line.alignmentOffset = boxWidth - lineLength;
+ line.alignmentOffset = boxWidth - lineLength;
+ }
break;
}
}
}
- LayoutEngine::Layout mLayout;
- LayoutEngine::HorizontalAlignment mHorizontalAlignment;
- LayoutEngine::VerticalAlignment mVerticalAlignment;
+ void Initialize( LineRun& line )
+ {
+ line.glyphRun.glyphIndex = 0u;
+ line.glyphRun.numberOfGlyphs = 0u;
+ line.characterRun.characterIndex = 0u;
+ line.characterRun.numberOfCharacters = 0u;
+ line.width = 0.f;
+ line.ascender = 0.f;
+ line.descender = 0.f;
+ line.extraLength = 0.f;
+ line.alignmentOffset = 0.f;
+ line.direction = LTR;
+ line.ellipsis = false;
+ line.lineSpacing = mDefaultLineSpacing;
+ }
+
+ Type mLayout;
float mCursorWidth;
+ float mDefaultLineSpacing;
IntrusivePtr<Metrics> mMetrics;
-
- bool mEllipsisEnabled:1;
};
-LayoutEngine::LayoutEngine()
-: mImpl( NULL )
+Engine::Engine()
+: mImpl{ nullptr }
{
- mImpl = new LayoutEngine::Impl();
+ mImpl = new Engine::Impl();
}
-LayoutEngine::~LayoutEngine()
+Engine::~Engine()
{
delete mImpl;
}
-void LayoutEngine::SetMetrics( MetricsPtr& metrics )
+void Engine::SetMetrics( MetricsPtr& metrics )
{
mImpl->mMetrics = metrics;
}
-void LayoutEngine::SetLayout( Layout layout )
+void Engine::SetLayout( Type layout )
{
mImpl->mLayout = layout;
}
-unsigned int LayoutEngine::GetLayout() const
+Engine::Type Engine::GetLayout() const
{
+ DALI_LOG_INFO( gLogFilter, Debug::Verbose, "GetLayout[%d]\n", mImpl->mLayout);
return mImpl->mLayout;
}
-void LayoutEngine::SetTextEllipsisEnabled( bool enabled )
-{
- mImpl->mEllipsisEnabled = enabled;
-}
-
-bool LayoutEngine::GetTextEllipsisEnabled() const
-{
- return mImpl->mEllipsisEnabled;
-}
-
-void LayoutEngine::SetHorizontalAlignment( HorizontalAlignment alignment )
+void Engine::SetCursorWidth( int width )
{
- mImpl->mHorizontalAlignment = alignment;
-}
-
-LayoutEngine::HorizontalAlignment LayoutEngine::GetHorizontalAlignment() const
-{
- return mImpl->mHorizontalAlignment;
-}
-
-void LayoutEngine::SetVerticalAlignment( VerticalAlignment alignment )
-{
- mImpl->mVerticalAlignment = alignment;
+ mImpl->mCursorWidth = static_cast<float>( width );
}
-LayoutEngine::VerticalAlignment LayoutEngine::GetVerticalAlignment() const
+int Engine::GetCursorWidth() const
{
- return mImpl->mVerticalAlignment;
+ return static_cast<int>( mImpl->mCursorWidth );
}
-void LayoutEngine::SetCursorWidth( int width )
+bool Engine::LayoutText( Parameters& layoutParameters,
+ Size& layoutSize,
+ bool elideTextEnabled,
+ bool& isAutoScrollEnabled )
{
- mImpl->mCursorWidth = static_cast<float>( width );
+ return mImpl->LayoutText( layoutParameters,
+ layoutSize,
+ elideTextEnabled,
+ isAutoScrollEnabled );
}
-int LayoutEngine::GetCursorWidth() const
+void Engine::Align( const Size& size,
+ CharacterIndex startIndex,
+ Length numberOfCharacters,
+ Text::HorizontalAlignment::Type horizontalAlignment,
+ Vector<LineRun>& lines,
+ float& alignmentOffset,
+ Dali::LayoutDirection::Type layoutDirection,
+ bool matchSystemLanguageDirection )
{
- return static_cast<int>( mImpl->mCursorWidth );
+ mImpl->Align( size,
+ startIndex,
+ numberOfCharacters,
+ horizontalAlignment,
+ lines,
+ alignmentOffset,
+ layoutDirection,
+ matchSystemLanguageDirection );
}
-bool LayoutEngine::LayoutText( const LayoutParameters& layoutParameters,
- Vector<Vector2>& glyphPositions,
- Vector<LineRun>& lines,
- Size& actualSize )
+void Engine::SetDefaultLineSpacing( float lineSpacing )
{
- return mImpl->LayoutText( layoutParameters,
- glyphPositions,
- lines,
- actualSize );
+ mImpl->mDefaultLineSpacing = lineSpacing;
}
-void LayoutEngine::ReLayoutRightToLeftLines( const LayoutParameters& layoutParameters,
- Vector<Vector2>& glyphPositions )
+float Engine::GetDefaultLineSpacing() const
{
- mImpl->ReLayoutRightToLeftLines( layoutParameters,
- glyphPositions );
+ return mImpl->mDefaultLineSpacing;
}
-void LayoutEngine::Align( const Size& layoutSize,
- Vector<LineRun>& lines )
-{
- mImpl->Align( layoutSize,
- lines );
-}
+} // namespace Layout
} // namespace Text
projects / platform / core / uifw / dali-toolkit.git / blobdiff