/// <summary>
/// Construct an lsrun
/// </summary>
private LSRun(
TextRunInfo runInfo,
IList <TextEffect> textEffects,
Plsrun type,
int offsetToFirstCp,
int textRunLength,
int emSize,
ushort charFlags,
CharacterBufferRange charBufferRange,
int baselineOffset,
int height,
TextShapeableSymbols shapeable,
byte bidiLevel
)
{
_runInfo = runInfo;
_type = type;
_offsetToFirstCp = offsetToFirstCp;
_textRunLength = textRunLength;
_emSize = emSize;
_charFlags = charFlags;
_charBufferRange = charBufferRange;
_baselineOffset = baselineOffset;
_height = height;
_bidiLevel = bidiLevel;
_shapeable = shapeable;
_textEffects = textEffects;
}
private IList <TextEffect> _textEffects; // TextEffects that should be applied for this run
/// <summary>
/// Construct an lsrun
/// </summary>
internal LSRun(
TextRunInfo runInfo,
IList <TextEffect> textEffects,
Plsrun type,
int offsetToFirstCp,
int textRunLength,
int emSize,
ushort charFlags,
CharacterBufferRange charBufferRange,
TextShapeableSymbols shapeable,
double realToIdeal,
byte bidiLevel
) :
this(
runInfo,
textEffects,
type,
offsetToFirstCp,
textRunLength,
emSize,
charFlags,
charBufferRange,
(shapeable != null ? (int)Math.Round(shapeable.Baseline * realToIdeal) : 0),
(shapeable != null ? (int)Math.Round(shapeable.Height * realToIdeal) : 0),
shapeable,
bidiLevel
)
{
}
/// <summary>
/// Construct a nominal description of glyph data
/// </summary>
internal Glyphs(
TextShapeableSymbols shapeable,
char[] charArray,
int[] nominalAdvances,
double scalingFactor
) :
this(
shapeable,
charArray,
nominalAdvances,
null, // clusterMap
null, // glyphIndices
null, // glyphOffsets
scalingFactor
)
{
}
public FormattedTextSymbols(
GlyphingCache glyphingCache,
TextRun textSymbols,
bool rightToLeft,
double scalingFactor,
float pixelsPerDip,
TextFormattingMode textFormattingMode,
bool isSideways
)
{
_textFormattingMode = textFormattingMode;
_isSideways = isSideways;
ITextSymbols symbols = textSymbols as ITextSymbols;
Debug.Assert(symbols != null);
// break down a single text run into pieces
IList <TextShapeableSymbols> shapeables = symbols.GetTextShapeableSymbols(
glyphingCache,
textSymbols.CharacterBufferReference,
textSymbols.Length,
rightToLeft, // This is a bool indicating the RTL
// based on the bidi level of text (if applicable).
// For FormattedTextSymbols it is equal to paragraph flow direction.
rightToLeft, // This is the flow direction of the paragraph as
// specified by the user. DWrite needs the paragraph
// flow direction of the paragraph
// while WPF algorithms need the RTL of the text based on
// Bidi if possible.
null, // cultureInfo
null, // textModifierScope
_textFormattingMode,
_isSideways
);
Debug.Assert(shapeables != null && shapeables.Count > 0);
_rightToLeft = rightToLeft;
_glyphs = new Glyphs[shapeables.Count];
CharacterBuffer charBuffer = textSymbols.CharacterBufferReference.CharacterBuffer;
int offsetToFirstChar = textSymbols.CharacterBufferReference.OffsetToFirstChar;
int i = 0;
int ich = 0;
while (i < shapeables.Count)
{
TextShapeableSymbols current = shapeables[i] as TextShapeableSymbols;
Debug.Assert(current != null);
int cch = current.Length;
int j;
// make a separate character buffer for glyphrun persistence
char[] charArray = new char[cch];
for (j = 0; j < cch; j++)
{
charArray[j] = charBuffer[offsetToFirstChar + ich + j];
}
if (current.IsShapingRequired)
{
ushort[] clusterMap;
ushort[] glyphIndices;
int[] glyphAdvances;
GlyphOffset[] glyphOffsets;
//
unsafe
{
fixed(char *fixedCharArray = &charArray[0])
{
MS.Internal.Text.TextInterface.TextAnalyzer textAnalyzer = MS.Internal.FontCache.DWriteFactory.Instance.CreateTextAnalyzer();
GlyphTypeface glyphTypeface = current.GlyphTypeFace;
DWriteFontFeature[][] fontFeatures;
uint[] fontFeatureRanges;
uint unsignedCch = checked ((uint)cch);
LSRun.CompileFeatureSet(current.Properties.TypographyProperties, unsignedCch, out fontFeatures, out fontFeatureRanges);
textAnalyzer.GetGlyphsAndTheirPlacements(
(ushort *)fixedCharArray,
unsignedCch,
glyphTypeface.FontDWrite,
glyphTypeface.BlankGlyphIndex,
false, // no sideway support yet
/************************************************************************************************/
//
rightToLeft,
current.Properties.CultureInfo,
/************************************************************************************************/
fontFeatures,
fontFeatureRanges,
current.Properties.FontRenderingEmSize,
scalingFactor,
pixelsPerDip,
_textFormattingMode,
current.ItemProps,
out clusterMap,
out glyphIndices,
out glyphAdvances,
out glyphOffsets
);
}
_glyphs[i] = new Glyphs(
current,
charArray,
glyphAdvances,
clusterMap,
glyphIndices,
glyphOffsets,
scalingFactor
);
}
}
else
{
// shaping not required,
// bypass glyphing process altogether
int[] nominalAdvances = new int[charArray.Length];
unsafe
{
fixed(char *fixedCharArray = &charArray[0])
fixed(int *fixedNominalAdvances = &nominalAdvances[0])
{
current.GetAdvanceWidthsUnshaped(
fixedCharArray,
cch,
scalingFactor, // format resolution specified per em,
fixedNominalAdvances
);
}
}
_glyphs[i] = new Glyphs(
current,
charArray,
nominalAdvances,
scalingFactor
);
}
i++;
ich += cch;
}
}
/// <summary>
/// Construct a full description of glyph data
/// </summary>
internal Glyphs(
TextShapeableSymbols shapeable,
char[] charArray,
int[] glyphAdvances,
ushort[] clusterMap,
ushort[] glyphIndices,
GlyphOffset[] glyphOffsets,
double scalingFactor
)
{
_shapeable = shapeable;
_charArray = charArray;
// create double array for glyph run creation, because Shaping is all done in
// ideal units. FormattedTextSymbol is used to draw text collapsing symbols
// which usually contains very few glyphs. Using double[] and Point[] directly
// is more efficient.
_glyphAdvances = new double[glyphAdvances.Length];
double ToReal = 1.0 / scalingFactor;
for (int i = 0; i < glyphAdvances.Length; i++)
{
_glyphAdvances[i] = glyphAdvances[i] * ToReal;
_width += _glyphAdvances[i];
}
if (glyphIndices != null)
{
_clusterMap = clusterMap;
if (glyphOffsets != null)
{
_glyphOffsets = new PartialArray <Point>(new Point[glyphOffsets.Length]);
for (int i = 0; i < glyphOffsets.Length; i++)
{
_glyphOffsets[i] = new Point(
glyphOffsets[i].du * ToReal,
glyphOffsets[i].dv * ToReal
);
}
}
Debug.Assert(glyphAdvances.Length <= glyphIndices.Length);
if (glyphAdvances.Length != glyphIndices.Length)
{
_glyphIndices = new ushort[glyphAdvances.Length];
for (int i = 0; i < glyphAdvances.Length; i++)
{
_glyphIndices[i] = glyphIndices[i];
}
}
else
{
_glyphIndices = glyphIndices;
}
}
}
/// <summary>
/// Return value indicates whether two runs can shape together
/// </summary>
/// <param name="shapeable">another run</param>
internal abstract bool CanShapeTogether(
TextShapeableSymbols shapeable
);
