#include <limits>
#include <dali/public-api/math/vector2.h>
#include <dali/public-api/text-abstraction/font-client.h>
+#include <dali/integration-api/debug.h>
// INTERNAL INCLUDES
#include <dali-toolkit/internal/text/layouts/layout-parameters.h>
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
LineLayout()
: glyphIndex( 0u ),
characterIndex( 0u ),
- numberOfCharacters( 0u ),
numberOfGlyphs( 0u ),
+ numberOfCharacters( 0u ),
length( 0.f ),
widthAdvanceDiff( 0.f ),
wsLengthEndOfLine( 0.f ),
{
glyphIndex = 0u;
characterIndex = 0u;
- numberOfCharacters = 0u;
numberOfGlyphs = 0u;
+ numberOfCharacters = 0u;
length = 0.f;
widthAdvanceDiff = 0.f;
wsLengthEndOfLine = 0.f;
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 width and the advance of the last glyph.
+ float widthAdvanceDiff; ///< The difference between the xBearing + width and the advance of the last glyph.
float wsLengthEndOfLine; ///< The length of the white spaces at the end of the line.
float ascender; ///< The maximum ascender of all fonts in the line.
float descender; ///< The minimum descender of all fonts in the line.
}
/**
+ * @brief Updates the line ascender and descender with the metrics of a new font.
+ *
+ * @param[in] fontId The id of the new font.
+ * @param[in,out] lineLayout The line layout.
+ */
+ void UpdateLineHeight( FontId fontId, LineLayout& lineLayout )
+ {
+ Text::FontMetrics fontMetrics;
+ mFontClient.GetFontMetrics( fontId, fontMetrics );
+
+ // Sets the maximum ascender.
+ if( fontMetrics.ascender > lineLayout.ascender )
+ {
+ lineLayout.ascender = fontMetrics.ascender;
+ }
+
+ // Sets the minimum descender.
+ if( fontMetrics.descender < lineLayout.descender )
+ {
+ lineLayout.descender = fontMetrics.descender;
+ }
+ }
+
+ /**
* @brief Merges a temporary line layout into the line layout.
*
* @param[in,out] lineLayout The line layout.
lineLayout.numberOfCharacters += tmpLineLayout.numberOfCharacters;
lineLayout.numberOfGlyphs += tmpLineLayout.numberOfGlyphs;
lineLayout.length += tmpLineLayout.length;
- lineLayout.widthAdvanceDiff = tmpLineLayout.widthAdvanceDiff;
if( 0.f < tmpLineLayout.length )
{
lineLayout.length += lineLayout.wsLengthEndOfLine;
lineLayout.wsLengthEndOfLine = tmpLineLayout.wsLengthEndOfLine;
+ lineLayout.widthAdvanceDiff = tmpLineLayout.widthAdvanceDiff;
}
else
{
void GetLineLayoutForBox( const LayoutParameters& parameters,
LineLayout& lineLayout )
{
+ DALI_LOG_INFO( gLogFilter, Debug::Verbose, "-->GetLineLayoutForBox\n" );
+ DALI_LOG_INFO( gLogFilter, Debug::Verbose, " initial glyph index : %d\n", lineLayout.glyphIndex );
// Stores temporary line layout which has not been added to the final line layout.
LineLayout tmpLineLayout;
const bool isMultiline = mLayout == MULTI_LINE_BOX;
const GlyphIndex lastGlyphIndex = parameters.totalNumberOfGlyphs - 1u;
- 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 Character character = *( parameters.textBuffer + characterFirstIndex );
const bool isWhiteSpace = TextAbstraction::IsWhiteSpace( character );
+ // Used to restore the temporal line layout when a single word does not fit in the control's width and is split by character.
+ const float previousTmpLineLength = tmpLineLayout.length;
+ const float previousTmpWidthAdvanceDiff = tmpLineLayout.widthAdvanceDiff;
+
// Increase the accumulated length.
if( isWhiteSpace )
{
// Add the length to the length of white spaces at the end of the line.
- tmpLineLayout.wsLengthEndOfLine += glyphInfo.advance; // I use the advance as the width is always zero for the white spaces.
- tmpLineLayout.widthAdvanceDiff = 0.f;
+ 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;
- tmpLineLayout.widthAdvanceDiff = glyphInfo.width - glyphInfo.advance;
+ if( RTL == firstCharacterDirection )
+ {
+ tmpLineLayout.widthAdvanceDiff = -glyphInfo.xBearing;
+ }
+ else
+ {
+ tmpLineLayout.widthAdvanceDiff = glyphInfo.xBearing + glyphInfo.width - glyphInfo.advance;
+ }
// Clear the white space length at the end of the line.
tmpLineLayout.wsLengthEndOfLine = 0.f;
}
// Check if the accumulated length fits in the width of the box.
- if( isMultiline &&
- ( lineLayout.length + tmpLineLayout.length + tmpLineLayout.widthAdvanceDiff + ( ( 0.f < tmpLineLayout.length ) ? lineLayout.wsLengthEndOfLine : 0.f ) > parameters.boundingBox.width ) )
+ if( isMultiline && !isWhiteSpace &&
+ ( lineLayout.length + lineLayout.wsLengthEndOfLine + tmpLineLayout.length + tmpLineLayout.widthAdvanceDiff > boundingBoxWidth ) )
{
// Current word does not fit in the box's width.
+ if( !oneWordLaidOut )
+ {
+ DALI_LOG_INFO( gLogFilter, Debug::Verbose, " Break the word by character\n" );
+
+ // The word's with doesn't fit in the control's with. It needs to be split by character.
+ if( tmpLineLayout.numberOfGlyphs > 1u )
+ {
+ tmpLineLayout.numberOfCharacters -= charactersPerGlyph;
+ --tmpLineLayout.numberOfGlyphs;
+ tmpLineLayout.length = previousTmpLineLength;
+ tmpLineLayout.widthAdvanceDiff = previousTmpWidthAdvanceDiff;
+ }
+
+ // 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;
}
// Must break the line. Update the line layout and return.
MergeLineLayout( lineLayout, tmpLineLayout );
+ DALI_LOG_INFO( gLogFilter, Debug::Verbose, " Must break\n" );
+ DALI_LOG_INFO( gLogFilter, Debug::Verbose, "<--GetLineLayoutForBox\n" );
return;
}
if( isMultiline &&
( TextAbstraction::WORD_BREAK == wordBreakInfo ) )
{
+ oneWordLaidOut = true;
+ DALI_LOG_INFO( gLogFilter, Debug::Verbose, " One word laid out\n" );
+
// Current glyph is the last one of the current word.
// Add the temporal layout to the current one.
MergeLineLayout( lineLayout, tmpLineLayout );
tmpLineLayout.Clear();
}
+ // 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 ascender.
- if( fontMetrics.ascender > tmpLineLayout.ascender )
- {
- tmpLineLayout.ascender = fontMetrics.ascender;
- }
-
- // Sets the minimum descender.
- if( -fontMetrics.descender < tmpLineLayout.descender )
- {
- tmpLineLayout.descender = fontMetrics.descender;
- }
-
+ UpdateLineHeight( glyphInfo.fontId, tmpLineLayout );
lastFontId = glyphInfo.fontId;
}
}
+ DALI_LOG_INFO( gLogFilter, Debug::Verbose, "<--GetLineLayoutForBox\n" );
}
bool LayoutText( const LayoutParameters& layoutParameters,
Vector<LineRun>& lines,
Size& actualSize )
{
+ DALI_LOG_INFO( gLogFilter, Debug::Verbose, "-->LayoutText\n" );
+ Vector2* glyphPositionsBuffer = glyphPositions.Begin();
+
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;
GetLineLayoutForBox( layoutParameters,
layout );
+ 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;
}
- // Create a line run and add it to the lines.
- const GlyphIndex lastGlyphIndex = index + layout.numberOfGlyphs - 1u;
-
LineRun lineRun;
lineRun.glyphIndex = index;
lineRun.numberOfGlyphs = layout.numberOfGlyphs;
- lineRun.characterRun.characterIndex = *( layoutParameters.glyphsToCharactersBuffer + index );
- lineRun.characterRun.numberOfCharacters = ( *( layoutParameters.glyphsToCharactersBuffer + lastGlyphIndex ) + *( layoutParameters.charactersPerGlyphBuffer + lastGlyphIndex ) ) - lineRun.characterRun.characterIndex;
- lineRun.width = layout.length + ( ( layout.widthAdvanceDiff > 0.f ) ? layout.widthAdvanceDiff : 0.f );
+ 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;
+ lineRun.extraLength = layout.wsLengthEndOfLine > 0.f ? layout.wsLengthEndOfLine - layout.widthAdvanceDiff : 0.f;
lineRun.direction = false;
lines.PushBack( lineRun );
// Update the actual size.
- if( layout.length + layout.widthAdvanceDiff > actualSize.width )
+ if( lineRun.width > actualSize.width )
{
- actualSize.width = layout.length;
+ actualSize.width = lineRun.width;
}
actualSize.height += ( lineRun.ascender + -lineRun.descender );
penY += layout.ascender;
- Vector2* glyphPositionsBuffer = glyphPositions.Begin();
+ // 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;
+
+ const GlyphInfo& glyph = *( layoutParameters.glyphsBuffer + index );
+ if( 0.f > glyph.xBearing )
+ {
+ penX = -glyph.xBearing;
+ }
+
for( GlyphIndex i = index; i < index + layout.numberOfGlyphs; ++i )
{
const GlyphInfo& glyph = *( layoutParameters.glyphsBuffer + i );
index += layout.numberOfGlyphs;
}
+ DALI_LOG_INFO( gLogFilter, Debug::Verbose, "<--LayoutText\n\n" );
return true;
}
float penX = 0.f;
+ const CharacterIndex characterVisualIndex = bidiLine.characterRun.characterIndex + *bidiLine.visualToLogicalMap;
+ const GlyphInfo& glyph = *( layoutParameters.glyphsBuffer + *( layoutParameters.charactersToGlyphsBuffer + characterVisualIndex ) );
+
+ penX = -glyph.xBearing;
+
Vector2* glyphPositionsBuffer = glyphPositions.Begin();
// Traverses the characters of the right to left paragraph.
projects / platform / core / uifw / dali-toolkit.git / blobdiff