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 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;
}
public override TextSpan <CultureSpecificCharacterBufferRange> GetPrecedingText(int textSourceCharacterIndexLimit)
{
CharacterBufferRange range1 = new CharacterBufferRange(text, 0, Math.Min(text.Length, textSourceCharacterIndexLimit));
CultureSpecificCharacterBufferRange range2 = new CultureSpecificCharacterBufferRange(Thread.CurrentThread.CurrentUICulture, range1);
return(new TextSpan <CultureSpecificCharacterBufferRange>(range1.Length, range2));
}
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
)
{
}
public override TextSpan <CultureSpecificCharacterBufferRange> GetPrecedingText(int textSourceCharacterIndexLimit)
{
try {
foreach (VisualLineElement element in VisualLine.Elements)
{
if (textSourceCharacterIndexLimit > element.VisualColumn &&
textSourceCharacterIndexLimit <= element.VisualColumn + element.VisualLength)
{
TextSpan <CultureSpecificCharacterBufferRange> span = element.GetPrecedingText(textSourceCharacterIndexLimit, this);
if (span == null)
{
break;
}
int relativeOffset = textSourceCharacterIndexLimit - element.VisualColumn;
if (span.Length > relativeOffset)
{
throw new ArgumentException("The returned TextSpan is too long.", element.GetType().Name + ".GetPrecedingText");
}
return(span);
}
}
CharacterBufferRange empty = CharacterBufferRange.Empty;
return(new TextSpan <CultureSpecificCharacterBufferRange>(empty.Length, new CultureSpecificCharacterBufferRange(null, empty)));
} catch (Exception ex) {
Debug.WriteLine(ex.ToString());
throw;
}
}
/// <summary>
/// Get family name correspondent to the first n-characters of the specified character string
/// </summary>
bool IFontFamily.GetMapTargetFamilyNameAndScale(
CharacterBufferRange unicodeString,
CultureInfo culture,
CultureInfo digitCulture,
double defaultSizeInEm,
out int cchAdvance,
out string targetFamilyName,
out double scaleInEm
)
{
Invariant.Assert(unicodeString.CharacterBuffer != null && unicodeString.Length > 0);
Invariant.Assert(culture != null);
// Get the family map. This will find the first family map that matches
// the specified culture, an ancestor neutral culture, or "any" culture.
FontFamilyMap familyMap = GetTargetFamilyMap(
unicodeString,
culture,
digitCulture,
out cchAdvance
);
// Return the values for the matching FontFamilyMap. If there is none this is
// FontFamilyMap.Default which has Target == null and Scale == 1.0.
targetFamilyName = familyMap.Target;
scaleInEm = familyMap.Scale;
return(true);
}
/// <summary>
/// Get spans of index to the list of scaled shapeable typeface of the specified
/// character string from the map table
/// </summary>
private bool GetCachedScaledTypefaceMap(
CharacterBufferRange unicodeString,
CultureInfo culture,
CultureInfo digitCulture,
ref SpanVector <int> cachedScaledTypefaceIndexSpans,
int ichItem
)
{
IntMap map;
if (!_intMaps.TryGetValue(culture, out map))
{
return(false);
}
DigitMap digitMap = new DigitMap(digitCulture);
int ich = 0;
while (ich < unicodeString.Length)
{
// Get map entry for first character.
int sizeofChar;
int ch = digitMap[
Classification.UnicodeScalar(
new CharacterBufferRange(unicodeString, ich, unicodeString.Length - ich),
out sizeofChar
)
];
ushort firstIndex = map[ch];
if (firstIndex == 0)
{
return(false);
}
// Advance past subsequent characters with the same mapping.
int cchSpan = sizeofChar;
for (; ich + cchSpan < unicodeString.Length; cchSpan += sizeofChar)
{
ch = digitMap[
Classification.UnicodeScalar(
new CharacterBufferRange(unicodeString, ich + cchSpan, unicodeString.Length - ich - cchSpan),
out sizeofChar
)
];
if (map[ch] != firstIndex && !Classification.IsCombining(ch) && !Classification.IsJoiner(ch))
{
break;
}
}
// map entry is stored in index+1, since 0 indicates uninitialized entry
cachedScaledTypefaceIndexSpans.Set(ichItem + ich, cchSpan, firstIndex - 1);
ich += cchSpan;
}
return(true);
}
public override TextSpan<CultureSpecificCharacterBufferRange> GetPrecedingText(int textSourceCharacterIndexLimit)
{
var cbr = new CharacterBufferRange(_text, 0, textSourceCharacterIndexLimit);
return new TextSpan<CultureSpecificCharacterBufferRange>(
textSourceCharacterIndexLimit,
new CultureSpecificCharacterBufferRange(CultureInfo.CurrentUICulture, cbr)
);
}
public override TextSpan <CultureSpecificCharacterBufferRange> GetPrecedingText(int textSourceCharacterIndexLimit)
{
var cbr = new CharacterBufferRange(Text, 0, textSourceCharacterIndexLimit);
return(new TextSpan <CultureSpecificCharacterBufferRange>(
textSourceCharacterIndexLimit,
new CultureSpecificCharacterBufferRange(System.Globalization.CultureInfo.CurrentUICulture, cbr)
));
}
internal void Truncate(int newLength)
{
_charBufferRange = new CharacterBufferRange(
_charBufferRange.CharacterBufferReference,
newLength
);
_textRunLength = newLength;
}
/// <inheritdoc/>
public override TextSpan<CultureSpecificCharacterBufferRange> GetPrecedingText(int visualColumnLimit, ITextRunConstructionContext context)
{
if (context == null)
throw new ArgumentNullException(nameof(context));
int relativeOffset = visualColumnLimit - VisualColumn;
StringSegment text = context.GetText(context.VisualLine.FirstDocumentLine.Offset + RelativeTextOffset, relativeOffset);
CharacterBufferRange range = new CharacterBufferRange(text.Text, text.Offset, text.Count);
return new TextSpan<CultureSpecificCharacterBufferRange>(range.Length, new CultureSpecificCharacterBufferRange(TextRunProperties.CultureInfo, range));
}
// Token: 0x0600666E RID: 26222 RVA: 0x001CC420 File Offset: 0x001CA620
public override TextSpan <CultureSpecificCharacterBufferRange> GetPrecedingText(int dcp)
{
CharacterBufferRange empty = CharacterBufferRange.Empty;
CultureInfo culture = null;
if (dcp > 0)
{
empty = new CharacterBufferRange(this._content, 0, Math.Min(dcp, this._content.Length));
culture = this._textProps.CultureInfo;
}
return(new TextSpan <CultureSpecificCharacterBufferRange>(dcp, new CultureSpecificCharacterBufferRange(culture, empty)));
}
/// <inheritdoc/>
public override TextSpan <CultureSpecificCharacterBufferRange> GetPrecedingText(int visualColumnLimit, ITextRunConstructionContext context)
{
if (context == null)
{
throw new ArgumentNullException("context");
}
int relativeOffset = visualColumnLimit - VisualColumn;
StringSegment text = context.GetText(context.VisualLine.FirstDocumentLine.Offset + RelativeTextOffset, relativeOffset);
CharacterBufferRange range = new CharacterBufferRange(text.Text, text.Offset, text.Count);
return(new TextSpan <CultureSpecificCharacterBufferRange>(range.Length, new CultureSpecificCharacterBufferRange(this.TextRunProperties.CultureInfo, range)));
}
/// <summary>
/// Lookup characters nominal glyphs and width
/// </summary>
/// <param name="charBufferRange">character buffer range</param>
/// <param name="emSize">height of Em</param>
/// <param name="toIdeal"> scaling factor from real to ideal unit </param>
/// <param name="nominalWidths">glyph nominal advances in ideal units</param>
/// <param name="idealWidth">total width in ideal units</param>
/// <returns>true for success</returns>
/// <remarks>This function is only used in fast path, and can only be called
/// if CheckFastPathNominalGlyphs has previously returned true.</remarks>
internal void GetCharacterNominalWidthsAndIdealWidth(
CharacterBufferRange charBufferRange,
double emSize,
float pixelsPerDip,
double toIdeal,
TextFormattingMode textFormattingMode,
bool isSideways,
out int[] nominalWidths,
out int idealWidth
)
{
// This function should only be called if CheckFastPathNominalGlyphs has
// returned true so we can assume the ITypefaceMetrics is a GlyphTypeface.
GlyphTypeface glyphTypeface = TryGetGlyphTypeface();
Invariant.Assert(glyphTypeface != null);
MS.Internal.Text.TextInterface.GlyphMetrics[] glyphMetrics = BufferCache.GetGlyphMetrics(charBufferRange.Length);
glyphTypeface.GetGlyphMetricsOptimized(charBufferRange,
emSize,
pixelsPerDip,
textFormattingMode,
isSideways,
glyphMetrics);
nominalWidths = new int[charBufferRange.Length];
idealWidth = 0;
if (TextFormattingMode.Display == textFormattingMode)
{
double designToEm = emSize / glyphTypeface.DesignEmHeight;
for (int i = 0; i < charBufferRange.Length; i++)
{
nominalWidths[i] = (int)Math.Round(TextFormatterImp.RoundDipForDisplayMode(glyphMetrics[i].AdvanceWidth * designToEm, pixelsPerDip) * toIdeal);
idealWidth += nominalWidths[i];
}
}
else
{
double designToEm = emSize * toIdeal / glyphTypeface.DesignEmHeight;
for (int i = 0; i < charBufferRange.Length; i++)
{
nominalWidths[i] = (int)Math.Round(glyphMetrics[i].AdvanceWidth * designToEm);
idealWidth += nominalWidths[i];
}
}
BufferCache.ReleaseGlyphMetrics(glyphMetrics);
}
/// <summary>
/// Get family name correspondent to the first n-characters of the specified character string
/// </summary>
bool IFontFamily.GetMapTargetFamilyNameAndScale(
CharacterBufferRange unicodeString,
CultureInfo culture,
CultureInfo digitCulture,
double defaultSizeInEm,
out int cchAdvance,
out string targetFamilyName,
out double scaleInEm
)
{
cchAdvance = unicodeString.Length;
targetFamilyName = null;
scaleInEm = defaultSizeInEm;
return(false);
}
/// <summary>
/// Map characters by font family name
/// </summary>
private int MapByFontFamilyName(
CharacterBufferRange unicodeString,
CultureInfo culture,
CultureInfo digitCulture,
string familyName,
Uri baseUri,
ref PhysicalFontFamily firstValidFamily,
ref int firstValidLength,
IDeviceFont deviceFont,
double scaleInEm,
int fontMappingDepth,
SpanVector scaledTypefaceSpans,
int firstCharIndex,
out int nextValid
)
{
if (familyName == null)
{
return(MapUnresolvedCharacters(
unicodeString,
culture,
digitCulture,
firstValidFamily,
ref firstValidLength,
scaledTypefaceSpans,
firstCharIndex,
out nextValid
));
}
else
{
// Map as many characters as we can to families in the list.
return(MapByFontFamilyList(
unicodeString,
culture,
digitCulture,
new FontFamily[] { new FontFamily(baseUri, familyName) },
ref firstValidFamily,
ref firstValidLength,
deviceFont,
scaleInEm,
fontMappingDepth,
scaledTypefaceSpans,
firstCharIndex,
out nextValid
));
}
}
// Token: 0x06004132 RID: 16690 RVA: 0x0012A184 File Offset: 0x00128384
public override TextSpan <CultureSpecificCharacterBufferRange> GetPrecedingText(int dcp)
{
CharacterBufferRange empty = CharacterBufferRange.Empty;
CultureInfo culture = null;
if (dcp > 0)
{
ITextPointer textPointer = this._owner.Host.TextContainer.CreatePointerAtOffset(dcp, LogicalDirection.Backward);
int num = Math.Min(128, textPointer.GetTextRunLength(LogicalDirection.Backward));
char[] array = new char[num];
textPointer.GetTextInRun(LogicalDirection.Backward, array, 0, num);
empty = new CharacterBufferRange(array, 0, num);
culture = DynamicPropertyReader.GetCultureInfo((Control)this._owner.Host);
}
return(new TextSpan <CultureSpecificCharacterBufferRange>(empty.Length, new CultureSpecificCharacterBufferRange(culture, empty)));
}
/// <summary>
/// Gets the character to glyph ID mapping.
/// </summary>
/// <param name="typeface">The typeface.</param>
/// <returns>Dictionary with pairs character - glyphId.</returns>
public IDictionary <char, ushort> GetCharacterToGlyphIdMapping(GlyphTypeface typeface)
{
/* Generate sequence of all characters representable in .Net and feed it into WPF conversion function
* - it will process the characters through its internal representation of CMAP and return glyph IDs. */
var conversionChars = Enumerable.Range(0, ushort.MaxValue).Select(p => (char)p).ToArray();
var characterBuffer = new CharacterBufferRange(conversionChars, 0, conversionChars.Length);
dynamic typefaceDynamic = new AccessPrivateWrapper(typeface);
var glyphIdArray = new ushort[conversionChars.Length];
typefaceDynamic.GetGlyphIndicesOptimized(characterBuffer, glyphIdArray);
return(conversionChars
.Zip(glyphIdArray, (charId, glyphId) => new { charId, glyphId })
.Where(p => p.glyphId != 0)
.ToDictionary(p => p.charId, p => p.glyphId));
}
/// <summary>
/// Maps characters that could not be resolved to any font family either to the first
/// valid physical font family or to the default font we use for display null glyphs.
/// </summary>
private int MapUnresolvedCharacters(
CharacterBufferRange unicodeString,
CultureInfo culture,
CultureInfo digitCulture,
PhysicalFontFamily firstValidFamily,
ref int firstValidLength,
SpanVector scaledTypefaceSpans,
int firstCharIndex,
out int nextValid
)
{
// If we have a valid font family use it. We don't set nullFont to true in this case.
// We may end up displaying missing glyphs, but we don't need to force it.
IFontFamily fontFamily = firstValidFamily;
bool nullFont = false;
if (firstValidLength <= 0)
{
// We didn't find any valid physical font family so use the default "Arial", and
// set nullFont to true to ensure that we always display missing glyphs.
fontFamily = FontFamily.LookupFontFamily(FontFamily.NullFontFamilyCanonicalName);
Invariant.Assert(fontFamily != null);
nullFont = true;
}
return(MapByFontFaceFamily(
unicodeString,
culture,
digitCulture,
fontFamily,
_canonicalStyle,
_canonicalWeight,
_canonicalStretch,
ref firstValidFamily,
ref firstValidLength,
null, // device font
nullFont,
1.0,
scaledTypefaceSpans,
firstCharIndex,
true, // ignore missing
out nextValid
));
}
/// <summary>
/// TextFormatter to get text immediately before specified text source position.
/// </summary>
public override TextSpan <CultureSpecificCharacterBufferRange> GetPrecedingText(
int textSourceCharacterIndexLimit
)
{
CharacterBufferRange charString = CharacterBufferRange.Empty;
if (textSourceCharacterIndexLimit > 0)
{
charString = new CharacterBufferRange(
new CharacterBufferReference(_characterArray, 0),
Math.Min(_characterArray.Length, textSourceCharacterIndexLimit)
);
}
return(new TextSpan <CultureSpecificCharacterBufferRange> (
textSourceCharacterIndexLimit,
new CultureSpecificCharacterBufferRange(CultureMapper.GetSpecificCulture(_textRunProperties.CultureInfo), charString)
));
}
internal LSRun(
TextRunInfo runInfo,
Plsrun type,
IntPtr controlChar,
int textRunLength,
int offsetToFirstCp,
byte bidiLevel
)
{
unsafe
{
_runInfo = runInfo;
_type = type;
_charBufferRange = new CharacterBufferRange((char *)controlChar, 1);
_textRunLength = textRunLength;
_offsetToFirstCp = offsetToFirstCp;
_bidiLevel = bidiLevel;
}
}
/// <summary>
/// Construct a shapeable characters object
/// </summary>
/// <remarks>
/// The shapeTypeface parameter can be null if and only if CheckFastPathNominalGlyphs
/// has previously returned true.
/// </remarks>
internal TextShapeableCharacters(
CharacterBufferRange characterRange,
TextRunProperties properties,
double emSize,
ItemProps textItem,
ShapeTypeface shapeTypeface,
bool nullShape,
TextFormattingMode textFormattingMode,
bool isSideways
)
{
_isSideways = isSideways;
_textFormattingMode = textFormattingMode;
_characterBufferRange = characterRange;
_properties = properties;
_emSize = emSize;
_textItem = textItem;
_shapeTypeface = shapeTypeface;
_nullShape = nullShape;
}
/// <summary>
/// Lookup characters nominal glyphs and width
/// </summary>
/// <param name="charBufferRange">character buffer range</param>
/// <param name="emSize">height of Em</param>
/// <param name="toIdeal"> scaling factor from real to ideal unit </param>
/// <param name="nominalWidths">glyph nominal advances in ideal units</param>
/// <returns>true for success</returns>
/// <remarks>This function is only used in fast path, and can only be called
/// if CheckFastPathNominalGlyphs has previously returned true.</remarks>
internal void GetCharacterNominalWidthsAndIdealWidth(
CharacterBufferRange charBufferRange,
double emSize,
double toIdeal,
TextFormattingMode textFormattingMode,
bool isSideways,
out int[] nominalWidths
)
{
int idealWidth;
GetCharacterNominalWidthsAndIdealWidth(
charBufferRange,
emSize,
toIdeal,
textFormattingMode,
isSideways,
out nominalWidths,
out idealWidth
);
}
private List <OrderedTextRun> ReorderRuns()
{
var result = new List <OrderedTextRun> ();
var store = _fullText.TextStore;
var settings = store.Settings;
int cpFirst = store.CpFirst;
int pos = cpFirst;
int remaining_length = Length;
// FIXME: Fetch bidi levels, reset to 0 for trailing whitespace
while (remaining_length > 0)
{
TextRun run;
int runLength;
CharacterBufferRange chars = settings.FetchTextRun(pos, cpFirst, out run, out runLength);
if (runLength > remaining_length)
{
runLength = remaining_length;
chars = new CharacterBufferRange(chars, 0, runLength);
}
// FIXME: determine bidi level and shorten runLength to keep bidi level constant
var ordered = new OrderedTextRun();
ordered.BidiLevel = 0;
ordered.TextRun = run;
ordered.Range = chars;
ordered.CpFirst = pos;
result.Add(ordered);
remaining_length -= runLength;
pos += runLength;
}
// FIXME: reverse bidi levels
return(result);
}
/// <summary>
/// Get text immediately before specified text source position. Return CharacterBufferRange
/// containing this text.
/// </summary>
/// <param name="dcp">
/// dcp of position relative to start of line
/// </param>
internal override TextSpan <CultureSpecificCharacterBufferRange> GetPrecedingText(int dcp)
{
// Parameter validation
Invariant.Assert(dcp >= 0);
int nonTextLength = 0;
CharacterBufferRange precedingText = CharacterBufferRange.Empty;
CultureInfo culture = null;
if (dcp > 0)
{
// Create TextPointer at dcp, and pointer at paragraph start to compare
ITextPointer startPosition = TextContainerHelper.GetTextPointerFromCP(_paraClient.Paragraph.StructuralCache.TextContainer, _cpPara, LogicalDirection.Forward);
ITextPointer position = TextContainerHelper.GetTextPointerFromCP(_paraClient.Paragraph.StructuralCache.TextContainer, _cpPara + dcp, LogicalDirection.Forward);
// Move backward until we find a position at the end of a text run, or reach start of TextContainer
while (position.GetPointerContext(LogicalDirection.Backward) != TextPointerContext.Text &&
position.CompareTo(startPosition) != 0)
{
position.MoveByOffset(-1);
nonTextLength++;
}
// Return text in run. If it is at start of TextContainer this will return an empty string
string precedingTextString = position.GetTextInRun(LogicalDirection.Backward);
precedingText = new CharacterBufferRange(precedingTextString, 0, precedingTextString.Length);
StaticTextPointer pointer = position.CreateStaticPointer();
DependencyObject element = (pointer.Parent != null) ? pointer.Parent : _paraClient.Paragraph.Element;
culture = DynamicPropertyReader.GetCultureInfo(element);
}
return(new TextSpan <CultureSpecificCharacterBufferRange>(
nonTextLength + precedingText.Length,
new CultureSpecificCharacterBufferRange(culture, precedingText)
));
}
// ------------------------------------------------------------------
// Get text immediately before specified text source position.
// ------------------------------------------------------------------
public override TextSpan <CultureSpecificCharacterBufferRange> GetPrecedingText(int dcp)
{
Debug.Assert(dcp >= 0, "Character index must be non-negative.");
CharacterBufferRange charString = CharacterBufferRange.Empty;
CultureInfo culture = null;
if (dcp > 0)
{
charString = new CharacterBufferRange(
_content,
0,
Math.Min(dcp, _content.Length)
);
culture = _textProps.CultureInfo;
}
return(new TextSpan <CultureSpecificCharacterBufferRange> (
dcp,
new CultureSpecificCharacterBufferRange(culture, charString)
));
}
// Token: 0x06006600 RID: 26112 RVA: 0x001CAB08 File Offset: 0x001C8D08
public override TextSpan <CultureSpecificCharacterBufferRange> GetPrecedingText(int dcp)
{
int num = 0;
CharacterBufferRange empty = CharacterBufferRange.Empty;
CultureInfo culture = null;
if (dcp > 0)
{
ITextPointer textPointer = this._owner.TextContainer.CreatePointerAtOffset(dcp, LogicalDirection.Backward);
while (textPointer.GetPointerContext(LogicalDirection.Backward) != TextPointerContext.Text && textPointer.CompareTo(this._owner.TextContainer.Start) != 0)
{
textPointer.MoveByOffset(-1);
num++;
}
string textInRun = textPointer.GetTextInRun(LogicalDirection.Backward);
empty = new CharacterBufferRange(textInRun, 0, textInRun.Length);
StaticTextPointer staticTextPointer = textPointer.CreateStaticPointer();
DependencyObject element = (staticTextPointer.Parent != null) ? staticTextPointer.Parent : this._owner;
culture = DynamicPropertyReader.GetCultureInfo(element);
}
return(new TextSpan <CultureSpecificCharacterBufferRange>(num + empty.Length, new CultureSpecificCharacterBufferRange(culture, empty)));
}
/// <summary>
/// Compute Unicode scalar value from unicode codepoint stream
/// </summary>
static internal int UnicodeScalar(
CharacterBufferRange unicodeString,
out int sizeofChar
)
{
Invariant.Assert(unicodeString.CharacterBuffer != null && unicodeString.Length > 0);
int ch = unicodeString[0];
sizeofChar = 1;
if (unicodeString.Length >= 2 &&
(ch & 0xFC00) == 0xD800 &&
(unicodeString[1] & 0xFC00) == 0xDC00
)
{
ch = (((ch & 0x03FF) << 10) | (unicodeString[1] & 0x3FF)) + 0x10000;
sizeofChar++;
}
return(ch);
}
// Token: 0x06006864 RID: 26724 RVA: 0x001D6C0C File Offset: 0x001D4E0C
internal override TextSpan <CultureSpecificCharacterBufferRange> GetPrecedingText(int dcp)
{
Invariant.Assert(dcp >= 0);
int num = 0;
CharacterBufferRange empty = CharacterBufferRange.Empty;
CultureInfo culture = null;
if (dcp > 0)
{
ITextPointer textPointerFromCP = TextContainerHelper.GetTextPointerFromCP(this._paraClient.Paragraph.StructuralCache.TextContainer, this._cpPara, LogicalDirection.Forward);
ITextPointer textPointerFromCP2 = TextContainerHelper.GetTextPointerFromCP(this._paraClient.Paragraph.StructuralCache.TextContainer, this._cpPara + dcp, LogicalDirection.Forward);
while (textPointerFromCP2.GetPointerContext(LogicalDirection.Backward) != TextPointerContext.Text && textPointerFromCP2.CompareTo(textPointerFromCP) != 0)
{
textPointerFromCP2.MoveByOffset(-1);
num++;
}
string textInRun = textPointerFromCP2.GetTextInRun(LogicalDirection.Backward);
empty = new CharacterBufferRange(textInRun, 0, textInRun.Length);
StaticTextPointer staticTextPointer = textPointerFromCP2.CreateStaticPointer();
DependencyObject element = (staticTextPointer.Parent != null) ? staticTextPointer.Parent : this._paraClient.Paragraph.Element;
culture = DynamicPropertyReader.GetCultureInfo(element);
}
return(new TextSpan <CultureSpecificCharacterBufferRange>(num + empty.Length, new CultureSpecificCharacterBufferRange(culture, empty)));
}
// ------------------------------------------------------------------
// Get text immediately before specified text source position.
// ------------------------------------------------------------------
public override TextSpan <CultureSpecificCharacterBufferRange> GetPrecedingText(int dcp)
{
// Parameter validation
Debug.Assert(dcp >= 0);
int nonTextLength = 0;
CharacterBufferRange precedingText = CharacterBufferRange.Empty;
CultureInfo culture = null;
if (dcp > 0)
{
// Create TextPointer at dcp
ITextPointer position = _owner.TextContainer.CreatePointerAtOffset(dcp, LogicalDirection.Backward);
// Move backward until we find a position at the end of a text run, or reach start of TextContainer
while (position.GetPointerContext(LogicalDirection.Backward) != TextPointerContext.Text &&
position.CompareTo(_owner.TextContainer.Start) != 0)
{
position.MoveByOffset(-1);
nonTextLength++;
}
// Return text in run. If it is at start of TextContainer this will return an empty string
string precedingTextString = position.GetTextInRun(LogicalDirection.Backward);
precedingText = new CharacterBufferRange(precedingTextString, 0, precedingTextString.Length);
StaticTextPointer pointer = position.CreateStaticPointer();
DependencyObject element = (pointer.Parent != null) ? pointer.Parent : _owner;
culture = DynamicPropertyReader.GetCultureInfo(element);
}
return(new TextSpan <CultureSpecificCharacterBufferRange>(
nonTextLength + precedingText.Length,
new CultureSpecificCharacterBufferRange(culture, precedingText)
));
}
/// <summary>
/// Get family name correspondent to the first n-characters of the specified character string
/// </summary>
/// <param name="unicodeString">character string</param>
/// <param name="culture">text culture info</param>
/// <param name="digitCulture">culture used for digit subsitution or null</param>
/// <param name="defaultSizeInEm">default size relative to em</param>
/// <param name="cchAdvance">number of characters advanced</param>
/// <param name="targetFamilyName">target family name</param>
/// <param name="scaleInEm">size relative to em</param>
/// <returns>number of character sharing the same family name and size</returns>
/// <remarks>
///
/// Null target family name returned indicates that the font family cannot find target
/// name of the character range being advanced.
///
/// Return value false indicates that the font family has no character map.
/// It is a font face family.
///
/// </remarks>
unsafe bool IFontFamily.GetMapTargetFamilyNameAndScale(
CharacterBufferRange unicodeString,
CultureInfo culture,
CultureInfo digitCulture,
double defaultSizeInEm,
out int cchAdvance,
out string targetFamilyName,
out double scaleInEm
)
{
Invariant.Assert(unicodeString.CharacterBuffer != null && unicodeString.Length > 0);
Invariant.Assert(culture != null);
// Get the family map. This will find the first family map that matches
// the specified culture, an ancestor neutral culture, or "any" culture.
FamilyCollection.CachedFamilyMap *familyMap = GetCachedFamilyMap(
unicodeString,
culture,
digitCulture,
out cchAdvance
);
if (familyMap == null)
{
targetFamilyName = null;
scaleInEm = 1;
}
else
{
int *sizePrefix = (int *)((byte *)familyMap + familyMap->targetFamilyNameOffset);
targetFamilyName = Util.StringCopyFromUncheckedPointer(sizePrefix + 1, *sizePrefix);
scaleInEm = familyMap->scaleInEm;
}
return(true);
}
/// <summary>
/// Get text immediately before specified text source position.
/// </summary>
public override TextSpan <CultureSpecificCharacterBufferRange> GetPrecedingText(int dcp)
{
CharacterBufferRange precedingText = CharacterBufferRange.Empty;
CultureInfo culture = null;
if (dcp > 0)
{
// Create TextPointer at dcp
ITextPointer position = _owner.Host.TextContainer.CreatePointerAtOffset(dcp, LogicalDirection.Backward);
// Return text in run. If it is at start of TextContainer this will return an empty string.
// Typically the caller requires just the preceding character. Worst case is the entire
// preceding sentence, which we approximate with a 128 char limit.
int runLength = Math.Min(128, position.GetTextRunLength(LogicalDirection.Backward));
char [] text = new char[runLength];
position.GetTextInRun(LogicalDirection.Backward, text, 0, runLength);
precedingText = new CharacterBufferRange(text, 0, runLength);
culture = DynamicPropertyReader.GetCultureInfo((Control)_owner.Host);
}
return(new TextSpan <CultureSpecificCharacterBufferRange>(
precedingText.Length, new CultureSpecificCharacterBufferRange(culture, precedingText)));
}
/// <summary>
/// Get text immediately preceding cpLimit.
/// </summary>
internal TextSpan <CultureSpecificCharacterBufferRange> GetPrecedingText(TextSource textSource, int cpLimit)
{
if (cpLimit > 0)
{
SpanRider textRunSpanRider = new SpanRider(_textRunVector, _latestPosition);
if (textRunSpanRider.At(cpLimit - 1))
{
CharacterBufferRange charString = CharacterBufferRange.Empty;
CultureInfo culture = null;
TextRun run = textRunSpanRider.CurrentElement as TextRun;
if (run != null)
{
// Only TextRun containing text would have non-empty Character buffer range.
if (TextRunInfo.GetRunType(run) == Plsrun.Text &&
run.CharacterBufferReference.CharacterBuffer != null)
{
charString = new CharacterBufferRange(
run.CharacterBufferReference,
cpLimit - textRunSpanRider.CurrentSpanStart);
culture = CultureMapper.GetSpecificCulture(run.Properties.CultureInfo);
}
return(new TextSpan <CultureSpecificCharacterBufferRange>(
cpLimit - textRunSpanRider.CurrentSpanStart, // cp length
new CultureSpecificCharacterBufferRange(culture, charString)
));
}
}
}
// not in cache so call back to client
return(textSource.GetPrecedingText(cpLimit));
}
// -----------------------------------------------------------------
// Get text immediately before specified text source position.
// ------------------------------------------------------------------
public override TextSpan<CultureSpecificCharacterBufferRange> GetPrecedingText(int dcp)
{
// Parameter validation
Debug.Assert(dcp >= 0);
int nonTextLength = 0;
CharacterBufferRange precedingText = CharacterBufferRange.Empty;
CultureInfo culture = null;
if (dcp > 0)
{
// Create TextPointer at dcp
ITextPointer position = _owner.TextContainer.CreatePointerAtOffset(dcp, LogicalDirection.Backward);
// Move backward until we find a position at the end of a text run, or reach start of TextContainer
while (position.GetPointerContext(LogicalDirection.Backward) != TextPointerContext.Text &&
position.CompareTo(_owner.TextContainer.Start) != 0)
{
position.MoveByOffset(-1);
nonTextLength++;
}
// Return text in run. If it is at start of TextContainer this will return an empty string
string precedingTextString = position.GetTextInRun(LogicalDirection.Backward);
precedingText = new CharacterBufferRange(precedingTextString, 0, precedingTextString.Length);
StaticTextPointer pointer = position.CreateStaticPointer();
DependencyObject element = (pointer.Parent != null) ? pointer.Parent : _owner;
culture = DynamicPropertyReader.GetCultureInfo(element);
}
return new TextSpan<CultureSpecificCharacterBufferRange>(
nonTextLength + precedingText.Length,
new CultureSpecificCharacterBufferRange(culture, precedingText)
);
}
// -----------------------------------------------------------------
// Get text immediately before specified text source position.
// ------------------------------------------------------------------
public override TextSpan<CultureSpecificCharacterBufferRange> GetPrecedingText(int dcp)
{
Debug.Assert(dcp >= 0, "Character index must be non-negative.");
CharacterBufferRange charString = CharacterBufferRange.Empty;
CultureInfo culture = null;
if (dcp > 0)
{
charString = new CharacterBufferRange(
_content,
0,
Math.Min(dcp, _content.Length)
);
culture = _textProps.CultureInfo;
}
return new TextSpan<CultureSpecificCharacterBufferRange> (
dcp,
new CultureSpecificCharacterBufferRange(culture, charString)
);
}
/// <summary>
/// Lookup characters nominal glyphs and width
/// </summary>
/// <param name="charBufferRange">character buffer range</param>
/// <param name="emSize">height of Em</param>
/// <param name="toIdeal"> scaling factor from real to ideal unit </param>
/// <param name="nominalWidths">glyph nominal advances in ideal units</param>
/// <param name="idealWidth">total width in ideal units</param>
/// <returns>true for success</returns>
/// <remarks>This function is only used in fast path, and can only be called
/// if CheckFastPathNominalGlyphs has previously returned true.</remarks>
internal void GetCharacterNominalWidthsAndIdealWidth(
CharacterBufferRange charBufferRange,
double emSize,
double toIdeal,
TextFormattingMode textFormattingMode,
bool isSideways,
out int[] nominalWidths,
out int idealWidth
)
{
// This function should only be called if CheckFastPathNominalGlyphs has
// returned true so we can assume the ITypefaceMetrics is a GlyphTypeface.
GlyphTypeface glyphTypeface = TryGetGlyphTypeface();
Invariant.Assert(glyphTypeface != null);
MS.Internal.Text.TextInterface.GlyphMetrics[] glyphMetrics = BufferCache.GetGlyphMetrics(charBufferRange.Length);
glyphTypeface.GetGlyphMetricsOptimized(charBufferRange,
emSize,
textFormattingMode,
isSideways,
glyphMetrics);
nominalWidths = new int[charBufferRange.Length];
idealWidth = 0;
if (TextFormattingMode.Display == textFormattingMode)
{
double designToEm = emSize / glyphTypeface.DesignEmHeight;
for (int i = 0; i < charBufferRange.Length; i++)
{
nominalWidths[i] = (int)Math.Round(TextFormatterImp.RoundDipForDisplayMode(glyphMetrics[i].AdvanceWidth * designToEm) * toIdeal);
idealWidth += nominalWidths[i];
}
}
else
{
double designToEm = emSize * toIdeal / glyphTypeface.DesignEmHeight;
for (int i = 0; i < charBufferRange.Length; i++)
{
nominalWidths[i] = (int)Math.Round(glyphMetrics[i].AdvanceWidth * designToEm);
idealWidth += nominalWidths[i];
}
}
BufferCache.ReleaseGlyphMetrics(glyphMetrics);
}
/// <summary>
/// Scan through specified character string checking for valid character
/// nominal glyph.
/// </summary>
/// <param name="charBufferRange">character buffer range</param>
/// <param name="emSize">height of Em</param>
/// <param name="scalingFactor">This is the factor by which we will scale up
/// the metrics. Typically this value to used to convert metrics from the real
/// space to the ideal space</param>
/// <param name="widthMax">maximum width allowed</param>
/// <param name="keepAWord">do not stop arbitrarily in the middle of a word</param>
/// <param name="numberSubstitution">digits require complex shaping</param>
/// <param name="cultureInfo">CultureInfo of the text</param>
/// <param name="stringLengthFit">number of character fit in given width</param>
/// <returns>whether the specified string can be optimized by nominal glyph lookup</returns>
internal bool CheckFastPathNominalGlyphs(
CharacterBufferRange charBufferRange,
double emSize,
double scalingFactor,
double widthMax,
bool keepAWord,
bool numberSubstitution,
CultureInfo cultureInfo,
TextFormattingMode textFormattingMode,
bool isSideways,
out int stringLengthFit
)
{
stringLengthFit = 0;
if (CachedTypeface.NullFont) return false;
GlyphTypeface glyphTypeface = TryGetGlyphTypeface();
if (glyphTypeface == null) return false;
double totalWidth = 0;
int i = 0;
ushort blankGlyph = glyphTypeface.BlankGlyphIndex;
ushort glyph = blankGlyph;
ushort charFlagsMask = numberSubstitution ?
(ushort)(CharacterAttributeFlags.CharacterComplex | CharacterAttributeFlags.CharacterDigit) :
(ushort)CharacterAttributeFlags.CharacterComplex;
ushort charFlags = 0;
ushort charFastTextCheck = (ushort)(CharacterAttributeFlags.CharacterFastText | CharacterAttributeFlags.CharacterIdeo);
bool symbolTypeface = glyphTypeface.Symbol;
if (symbolTypeface)
{
// we don't care what code points are present if it's a non-Unicode font such as Symbol or Wingdings;
// the code points don't have any standardized meanings, and we always want to bypass shaping
charFlagsMask = 0;
}
bool ignoreWidths = widthMax == double.MaxValue;
ushort[] glyphIndices = BufferCache.GetUShorts(charBufferRange.Length);
MS.Internal.Text.TextInterface.GlyphMetrics[] glyphMetrics = ignoreWidths ? null : BufferCache.GetGlyphMetrics(charBufferRange.Length);
glyphTypeface.GetGlyphMetricsOptimized(charBufferRange,
emSize,
glyphIndices,
glyphMetrics,
textFormattingMode,
isSideways
);
double designToEm = emSize / glyphTypeface.DesignEmHeight;
//
// This block will advance until one of:
// 1. The end of the charBufferRange is reached
// 2. The charFlags have some of the charFlagsMask values
// 3. The glyph is BlankGlyph (space)
// 4. Glyph index is 0 (unless symbol font)
//
// At this point totalWidth includes all of the widths including the stop character (which fits above)
// i indexes the next character (not included in the width)
//
if(keepAWord)
{
do
{
char ch = charBufferRange[i++];
if (ch == TextStore.CharLineFeed || ch == TextStore.CharCarriageReturn)
{
--i;
break;
}
else
{
int charClass = (int)Classification.GetUnicodeClassUTF16(ch);
charFlags = Classification.CharAttributeOf(charClass).Flags;
charFastTextCheck &= charFlags;
glyph = glyphIndices[i-1];
if (!ignoreWidths)
{
totalWidth += TextFormatterImp.RoundDip(glyphMetrics[i - 1].AdvanceWidth * designToEm, textFormattingMode) * scalingFactor;
}
}
} while(
i < charBufferRange.Length
&& ((charFlags & charFlagsMask) == 0)
&& (glyph != 0 || symbolTypeface)
&& glyph != blankGlyph
);
// i is now at a character immediately following a leading blank
}
//
// This block will advance until one of:
// 1. The end of the charBufferRange is reached
// 2. The charFlags have some of the charFlagsMask values
// 3. Glyph index is 0 (unless symbol font)
// 4. totalWidth > widthMax
//
while(
i < charBufferRange.Length
&& (ignoreWidths || totalWidth <= widthMax)
&& ((charFlags & charFlagsMask) == 0)
&& (glyph != 0 || symbolTypeface)
)
{
char ch = charBufferRange[i++];
if (ch == TextStore.CharLineFeed || ch == TextStore.CharCarriageReturn)
{
--i;
break;
}
else
{
int charClass = (int)Classification.GetUnicodeClassUTF16(ch);
charFlags = Classification.CharAttributeOf(charClass).Flags;
charFastTextCheck &= charFlags;
glyph = glyphIndices[i-1];
if (!ignoreWidths)
{
totalWidth += TextFormatterImp.RoundDip(glyphMetrics[i - 1].AdvanceWidth * designToEm, textFormattingMode) * scalingFactor;
}
}
}
BufferCache.ReleaseUShorts(glyphIndices);
glyphIndices = null;
BufferCache.ReleaseGlyphMetrics(glyphMetrics);
glyphMetrics = null;
if (symbolTypeface)
{
// always optimize for non-Unicode font as we don't support shaping or typographic features;
// we also don't fall back from non-Unicode fonts so we don't care if there are missing glyphs
stringLengthFit = i;
return true;
}
if (glyph == 0)
{
// character is not supported by the font
return false;
}
if ((charFlags & charFlagsMask) != 0)
{
// complex character encountered, exclude it
Debug.Assert(i > 0);
if(--i <= 0)
{
// first char is complex, fail the call
return false;
}
}
stringLengthFit = i;
TypographyAvailabilities typography = glyphTypeface.FontFaceLayoutInfo.TypographyAvailabilities;
if ((charFastTextCheck & (byte) CharacterAttributeFlags.CharacterFastText) != 0)
{
// all input code points are Fast Text
if ((typography &
( TypographyAvailabilities.FastTextTypographyAvailable
| TypographyAvailabilities.FastTextMajorLanguageLocalizedFormAvailable
)
) != 0
)
{
// Considered too risky to optimize. It is either because the font
// has required features or the font has 'locl' lookup for major languages.
return false;
}
else if ((typography & TypographyAvailabilities.FastTextExtraLanguageLocalizedFormAvailable) != 0)
{
// The font has 'locl' lookup for FastText code points for non major languages.
// Check whether the input is major langauge. If it is, we are still good to optimize.
return MajorLanguages.Contains(cultureInfo);
}
else
{
// No FastText flags are present, safe to optimize
return true;
}
}
else if ((charFastTextCheck & (byte) CharacterAttributeFlags.CharacterIdeo) != 0)
{
// The input are all ideographs, check the IdeoTypographyAvailable bit. It is safe if
// the bit is not set.
return ((typography & TypographyAvailabilities.IdeoTypographyAvailable) == 0);
}
else
{
// for all the rest of the cases, just check whether there is any required typography
// present at all. If none exists, it is optimizable. We might under-optimize here but
// it will be non-major languages.
return ((typography & TypographyAvailabilities.Available) == 0);
}
}
private FontFamilyMap GetTargetFamilyMap(
CharacterBufferRange unicodeString,
CultureInfo culture,
CultureInfo digitCulture,
out int cchAdvance
)
{
DigitMap digitMap = new DigitMap(digitCulture);
ushort[] familyMaps = _fontInfo.GetFamilyMapsOfLanguage(XmlLanguage.GetLanguage(culture.IetfLanguageTag));
int sizeofChar = 0;
int ch = 0;
// skip all the leading joinder characters. They need to be shaped with the
// surrounding strong characters.
cchAdvance = Classification.AdvanceWhile(unicodeString, ItemClass.JoinerClass);
if (cchAdvance >= unicodeString.Length)
{
// It is rare that the run only contains joiner characters.
// If it really happens, just map them to the initial family map.
return _fontInfo.GetFamilyMapOfChar(
familyMaps,
Classification.UnicodeScalar(unicodeString, out sizeofChar)
);
}
//
// If the run starts with combining marks, we will not be able to find base characters for them
// within the run. These combining marks will be mapped to their best fonts as normal characters.
//
ch = Classification.UnicodeScalar(
new CharacterBufferRange(unicodeString, cchAdvance, unicodeString.Length - cchAdvance),
out sizeofChar
);
bool hasBaseChar = !Classification.IsCombining(ch);
ch = digitMap[ch];
FontFamilyMap familyMap = _fontInfo.GetFamilyMapOfChar(familyMaps, ch);
Invariant.Assert(familyMap != null);
for (cchAdvance += sizeofChar; cchAdvance < unicodeString.Length; cchAdvance += sizeofChar)
{
ch = Classification.UnicodeScalar(
new CharacterBufferRange(unicodeString, cchAdvance, unicodeString.Length - cchAdvance),
out sizeofChar
);
if (Classification.IsJoiner(ch))
continue; // continue to advance if current char is a joiner
if (!Classification.IsCombining(ch))
{
hasBaseChar = true;
}
else if (hasBaseChar)
{
continue; // continue to advance for combining mark with base char
}
ch = digitMap[ch];
if (_fontInfo.GetFamilyMapOfChar(familyMaps, ch) != familyMap)
break;
}
return familyMap;
}
private void MapItem(
CharacterBufferRange unicodeString,
CultureInfo culture,
Span itemSpan,
ref SpanVector<int> cachedScaledTypefaceIndexSpans,
int ichItem
)
{
CultureInfo digitCulture = ((MS.Internal.Text.TextInterface.ItemProps)itemSpan.element).DigitCulture;
bool isCached = GetCachedScaledTypefaceMap(
unicodeString,
culture,
digitCulture,
ref cachedScaledTypefaceIndexSpans,
ichItem
);
if(!isCached)
{
// shapeable typeface to shape each character in the item has not been located,
// look thru information in font family searching for the right shapeable typeface.
SpanVector scaledTypefaceSpans = new SpanVector(null);
int nextValid;
// we haven't yet found a valid physical font family
PhysicalFontFamily firstValidFamily = null;
int firstValidLength = 0;
if (!_nullFont)
{
MapByFontFamilyList(
unicodeString,
culture,
digitCulture,
_fontFamilies,
ref firstValidFamily,
ref firstValidLength,
null, // device font
1.0, // default size is one em
0, // recursion depth
scaledTypefaceSpans,
0, // firstCharIndex
out nextValid
);
}
else
{
MapUnresolvedCharacters(
unicodeString,
culture,
digitCulture,
firstValidFamily,
ref firstValidLength,
scaledTypefaceSpans,
0, // firstCharIndex
out nextValid
);
}
CacheScaledTypefaceMap(
unicodeString,
culture,
digitCulture,
scaledTypefaceSpans,
ref cachedScaledTypefaceIndexSpans,
ichItem
);
}
}
/// <summary>
/// Map characters by font face family
/// </summary>
private int MapByFontFaceFamily(
CharacterBufferRange unicodeString,
CultureInfo culture,
CultureInfo digitCulture,
IFontFamily fontFamily,
FontStyle canonicalStyle,
FontWeight canonicalWeight,
FontStretch canonicalStretch,
ref PhysicalFontFamily firstValidFamily,
ref int firstValidLength,
IDeviceFont deviceFont,
bool nullFont,
double scaleInEm,
SpanVector scaledTypefaceSpans,
int firstCharIndex,
bool ignoreMissing,
out int nextValid
)
{
Invariant.Assert(fontFamily != null);
PhysicalFontFamily fontFaceFamily = fontFamily as PhysicalFontFamily;
Invariant.Assert(fontFaceFamily != null);
int advance = unicodeString.Length;
nextValid = 0;
GlyphTypeface glyphTypeface = null;
if(ignoreMissing)
{
glyphTypeface = fontFaceFamily.GetGlyphTypeface(canonicalStyle, canonicalWeight, canonicalStretch);
}
else if(nullFont)
{
glyphTypeface = fontFaceFamily.GetGlyphTypeface(canonicalStyle, canonicalWeight, canonicalStretch);
advance = 0; // by definition, null font always yields missing glyphs for whatever codepoint
nextValid = unicodeString.Length;
}
else
{
glyphTypeface = fontFaceFamily.MapGlyphTypeface(
canonicalStyle,
canonicalWeight,
canonicalStretch,
unicodeString,
digitCulture,
ref advance,
ref nextValid
);
}
Invariant.Assert(glyphTypeface != null);
int cch = unicodeString.Length;
if(!ignoreMissing && advance > 0)
{
cch = advance;
}
// Do we need to set firstValidFamily?
if (firstValidLength <= 0)
{
// Either firstValidFamily hasn't been set, or has "expired" (see below). The first valid
// family is the first existing physical font in the font linking chain. We want to remember
// it so we can use it to map any unresolved characters.
firstValidFamily = fontFaceFamily;
// Set the "expiration date" for firstValidFamily. We know that this is the first physical
// font for the specified character range, but after that family map lookup may result in
// a different first physical family.
firstValidLength = unicodeString.Length;
}
// Each time we advance we near the expiration date for firstValidFamily.
firstValidLength -= advance;
Debug.Assert(cch > 0);
scaledTypefaceSpans.SetValue(
firstCharIndex,
cch,
new ScaledShapeTypeface(
glyphTypeface,
deviceFont,
scaleInEm,
nullFont
)
);
return advance;
}
/// <summary>
/// Maps characters to one of the font families in the specified FontFamilyList. This
/// function differs from MapByFontFamilyList in that it returns as soon as at least
/// one character is mapped; it does not keep going until it cannot map any more text.
/// </summary>
private int MapOnceByFontFamilyList(
CharacterBufferRange unicodeString,
CultureInfo culture,
CultureInfo digitCulture,
FontFamily[] familyList,
ref PhysicalFontFamily firstValidFamily,
ref int firstValidLength,
IDeviceFont deviceFont,
double scaleInEm,
int recursionDepth,
SpanVector scaledTypefaceSpans,
int firstCharIndex,
out int nextValid
)
{
Invariant.Assert(familyList != null);
int advance = 0;
nextValid = 0;
CharacterBufferRange mapString = unicodeString;
FontStyle canonicalStyle = _canonicalStyle;
FontWeight canonicalWeight = _canonicalWeight;
FontStretch canonicalStretch = _canonicalStretch;
// Note: FontFamilyIdentifier limits the number of family names in a single string. We
// don't want to also limit the number of iterations here because if Typeface.FontFamily
// has the maximum number of tokens, this should not prevent us from falling back to the
// FallbackFontFamily (PS # 1148305).
// Outer loop to loop over the list of FontFamily.
for (int i = 0; i < familyList.Length; i++)
{
// grab the font family identifier and initialize the
// target family based on whether it is a named font.
FontFamilyIdentifier fontFamilyIdentifier = familyList[i].FamilyIdentifier;
CanonicalFontFamilyReference canonicalFamilyReference = null;
IFontFamily targetFamily;
if (fontFamilyIdentifier.Count != 0)
{
// Look up font family and face, in the case of multiple canonical families the weight/style/stretch
// may not match the typeface map's, since it is created w/ the first canonical family.
canonicalFamilyReference = fontFamilyIdentifier[0];
targetFamily = FontFamily.LookupFontFamilyAndFace(canonicalFamilyReference, ref canonicalStyle, ref canonicalWeight, ref canonicalStretch);
}
else
{
targetFamily = familyList[i].FirstFontFamily;
}
int familyNameIndex = 0;
// Inner loop to loop over all name tokens of a FontFamily.
for (;;)
{
if (targetFamily != null)
{
advance = MapByFontFamily(
mapString,
culture,
digitCulture,
targetFamily,
canonicalFamilyReference,
canonicalStyle,
canonicalWeight,
canonicalStretch,
ref firstValidFamily,
ref firstValidLength,
deviceFont,
scaleInEm,
recursionDepth,
scaledTypefaceSpans,
firstCharIndex,
out nextValid
);
if (nextValid < mapString.Length)
{
// only strings before the smallest invalid needs to be mapped since
// string beyond smallest invalid can already be mapped to a higher priority font.
mapString = new CharacterBufferRange(
unicodeString.CharacterBuffer,
unicodeString.OffsetToFirstChar,
nextValid
);
}
if (advance > 0)
{
// found the family that shapes this string. We terminate both the
// inner and outer loops.
i = familyList.Length;
break;
}
}
else
{
// By definition null target does not map any of the input.
nextValid = mapString.Length;
}
if (++familyNameIndex < fontFamilyIdentifier.Count)
{
// Get the next canonical family name and target family.
canonicalFamilyReference = fontFamilyIdentifier[familyNameIndex];
targetFamily = FontFamily.LookupFontFamilyAndFace(canonicalFamilyReference, ref canonicalStyle, ref canonicalWeight, ref canonicalStretch);
}
else
{
// Unnamed FontFamily or no more family names in this FontFamily.
break;
}
}
}
nextValid = mapString.Length;
return advance;
}
/// <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;
}
/// <summary>
/// Get text immediately before specified text source position.
/// </summary>
public override TextSpan<CultureSpecificCharacterBufferRange> GetPrecedingText(int dcp)
{
CharacterBufferRange precedingText = CharacterBufferRange.Empty;
CultureInfo culture = null;
if (dcp > 0)
{
// Create TextPointer at dcp
ITextPointer position = _owner.Host.TextContainer.CreatePointerAtOffset(dcp, LogicalDirection.Backward);
// Return text in run. If it is at start of TextContainer this will return an empty string.
// Typically the caller requires just the preceding character. Worst case is the entire
// preceding sentence, which we approximate with a 128 char limit.
int runLength = Math.Min(128, position.GetTextRunLength(LogicalDirection.Backward));
char []text = new char[runLength];
position.GetTextInRun(LogicalDirection.Backward, text, 0, runLength);
precedingText = new CharacterBufferRange(text, 0, runLength);
culture = DynamicPropertyReader.GetCultureInfo((Control)_owner.Host);
}
return new TextSpan<CultureSpecificCharacterBufferRange>(
precedingText.Length, new CultureSpecificCharacterBufferRange(culture, precedingText));
}
/// <summary>
/// TextFormatter to get text immediately before specified text source position.
/// </summary>
/// <param name="textSourceCharacterIndexLimit">character index to specify where in the source text the text retrieval stops.</param>
/// <returns>character string immediately before the specify text source character index.</returns>
public override TextSpan<CultureSpecificCharacterBufferRange> GetPrecedingText(
int textSourceCharacterIndexLimit
)
{
CharacterBufferRange charString = CharacterBufferRange.Empty;
CultureInfo culture = null;
if (textSourceCharacterIndexLimit > 0)
{
SpanRider thatFormatRider = new SpanRider(
_that._formatRuns,
_that._latestPosition,
textSourceCharacterIndexLimit - 1
);
charString = new CharacterBufferRange(
new CharacterBufferReference(_that._text, thatFormatRider.CurrentSpanStart),
textSourceCharacterIndexLimit - thatFormatRider.CurrentSpanStart
);
culture = ((TextRunProperties)thatFormatRider.CurrentElement).CultureInfo;
}
return new TextSpan<CultureSpecificCharacterBufferRange> (
charString.Length,
new CultureSpecificCharacterBufferRange(culture, charString)
);
}
/// <summary>
/// Add shapeable text object to the list
/// </summary>
void IShapeableTextCollector.Add(
IList<TextShapeableSymbols> shapeables,
CharacterBufferRange characterBufferRange,
TextRunProperties textRunProperties,
MS.Internal.Text.TextInterface.ItemProps textItem,
ShapeTypeface shapeTypeface,
double emScale,
bool nullShape,
TextFormattingMode textFormattingMode
)
{
Debug.Assert(shapeables != null);
shapeables.Add(
new TextShapeableCharacters(
characterBufferRange,
textRunProperties,
textRunProperties.FontRenderingEmSize * emScale,
textItem,
shapeTypeface,
nullShape,
textFormattingMode,
false
)
);
}
/// <summary>
/// Get family name correspondent to the first n-characters of the specified character string
/// </summary>
bool IFontFamily.GetMapTargetFamilyNameAndScale(
CharacterBufferRange unicodeString,
CultureInfo culture,
CultureInfo digitCulture,
double defaultSizeInEm,
out int cchAdvance,
out string targetFamilyName,
out double scaleInEm
)
{
Invariant.Assert(unicodeString.CharacterBuffer != null && unicodeString.Length > 0);
Invariant.Assert(culture != null);
// Get the family map. This will find the first family map that matches
// the specified culture, an ancestor neutral culture, or "any" culture.
FontFamilyMap familyMap = GetTargetFamilyMap(
unicodeString,
culture,
digitCulture,
out cchAdvance
);
// Return the values for the matching FontFamilyMap. If there is none this is
// FontFamilyMap.Default which has Target == null and Scale == 1.0.
targetFamilyName = familyMap.Target;
scaleInEm = familyMap.Scale;
return true;
}
/// <summary>
/// Get text immediately preceding cpLimit.
/// </summary>
internal TextSpan<CultureSpecificCharacterBufferRange> GetPrecedingText(TextSource textSource, int cpLimit)
{
if (cpLimit > 0)
{
SpanRider textRunSpanRider = new SpanRider(_textRunVector, _latestPosition);
if (textRunSpanRider.At(cpLimit - 1))
{
CharacterBufferRange charString = CharacterBufferRange.Empty;
CultureInfo culture = null;
TextRun run = textRunSpanRider.CurrentElement as TextRun;
if (run != null)
{
// Only TextRun containing text would have non-empty Character buffer range.
if ( TextRunInfo.GetRunType(run) == Plsrun.Text
&& run.CharacterBufferReference.CharacterBuffer != null)
{
charString = new CharacterBufferRange(
run.CharacterBufferReference,
cpLimit - textRunSpanRider.CurrentSpanStart);
culture = CultureMapper.GetSpecificCulture(run.Properties.CultureInfo);
}
return new TextSpan<CultureSpecificCharacterBufferRange>(
cpLimit - textRunSpanRider.CurrentSpanStart, // cp length
new CultureSpecificCharacterBufferRange(culture, charString)
);
}
}
}
// not in cache so call back to client
return textSource.GetPrecedingText(cpLimit);
}
static public int AdvanceWhile(
CharacterBufferRange unicodeString,
ItemClass itemClass
)
{
int i = 0;
int limit = unicodeString.Length;
int sizeofChar = 0;
while (i < limit)
{
int ch = Classification.UnicodeScalar(
new CharacterBufferRange(unicodeString, i, limit - i),
out sizeofChar
);
unsafe
{
byte currentClass = (byte) Classification.CharAttributeTable[(int)GetUnicodeClass(ch)].ItemClass;
if (currentClass != (byte) itemClass)
break;
}
i += sizeofChar;
}
return i;
}
/// <summary>
/// Compute Unicode scalar value from unicode codepoint stream
/// </summary>
static internal int UnicodeScalar(
CharacterBufferRange unicodeString,
out int sizeofChar
)
{
Invariant.Assert(unicodeString.CharacterBuffer != null && unicodeString.Length > 0);
int ch = unicodeString[0];
sizeofChar = 1;
if ( unicodeString.Length >= 2
&& (ch & 0xFC00) == 0xD800
&& (unicodeString[1] & 0xFC00) == 0xDC00
)
{
ch = (((ch & 0x03FF) << 10) | (unicodeString[1] & 0x3FF)) + 0x10000;
sizeofChar++;
}
return ch;
}
/// <summary>
/// Cache index to the list of scaled shapeable typeface
/// </summary>
private void CacheScaledTypefaceMap(
CharacterBufferRange unicodeString,
CultureInfo culture,
CultureInfo digitCulture,
SpanVector scaledTypefaceSpans,
ref SpanVector<int> cachedScaledTypefaceIndexSpans,
int ichItem
)
{
IntMap map;
if (!_intMaps.TryGetValue(culture, out map))
{
map = new IntMap();
_intMaps.Add(culture, map);
}
DigitMap digitMap = new DigitMap(digitCulture);
SpanRider typefaceSpanRider = new SpanRider(scaledTypefaceSpans);
int ich = 0;
while(ich < unicodeString.Length)
{
typefaceSpanRider.At(ich);
int cch = Math.Min(unicodeString.Length - ich, typefaceSpanRider.Length);
int index = IndexOfScaledTypeface((ScaledShapeTypeface)typefaceSpanRider.CurrentElement);
Debug.Assert(index >= 0, "Invalid scaled shapeable typeface index spans");
cachedScaledTypefaceIndexSpans.Set(ichItem + ich, cch, index);
// we keep index + 1 in the map, so that we leave map entry zero
// to indicate uninitialized entry.
index++;
int sizeofChar;
for (int c = 0; c < cch; c += sizeofChar)
{
int ch = digitMap[
Classification.UnicodeScalar(
new CharacterBufferRange(unicodeString, ich + c, unicodeString.Length - ich - c),
out sizeofChar
)
];
// only cache typeface map index for base characters
if(!Classification.IsCombining(ch) && !Classification.IsJoiner(ch))
{
// Dump values of local variables when the condition fails for better debuggability.
// We use "if" to avoid the expensive string.Format() in normal case.
if (map[ch] != 0 && map[ch] != index)
{
Invariant.Assert(
false,
string.Format(
CultureInfo.InvariantCulture,
"shapeable cache stores conflicting info, ch = {0}, map[ch] = {1}, index = {2}",
ch, map[ch], index
)
);
}
map[ch] = (ushort)index;
}
}
ich += cch;
}
}
internal sealed override unsafe void GetAdvanceWidthsUnshaped(
char* characterString,
int characterLength,
double scalingFactor,
int* advanceWidthsUnshaped
)
{
if (!IsShapingRequired)
{
if ( (_shapeTypeface != null)
&& (_shapeTypeface.DeviceFont != null))
{
// Use device font to compute advance widths
_shapeTypeface.DeviceFont.GetAdvanceWidths(
characterString,
characterLength,
_emSize * scalingFactor,
advanceWidthsUnshaped
);
}
else
{
bool nullFont;
GlyphTypeface glyphTypeface = GetGlyphTypeface(out nullFont);
Invariant.Assert(glyphTypeface != null);
glyphTypeface.GetAdvanceWidthsUnshaped(
characterString,
characterLength,
_emSize,
scalingFactor,
advanceWidthsUnshaped,
nullFont,
_textFormattingMode,
_isSideways
);
}
}
else
{
GlyphTypeface glyphTypeface = _shapeTypeface.GlyphTypeface;
Invariant.Assert(glyphTypeface != null);
Invariant.Assert(characterLength > 0);
CharacterBufferRange newBuffer = new CharacterBufferRange(characterString, characterLength);
MS.Internal.Text.TextInterface.GlyphMetrics[] glyphMetrics = BufferCache.GetGlyphMetrics(characterLength);
glyphTypeface.GetGlyphMetricsOptimized(newBuffer,
_emSize,
_textFormattingMode,
_isSideways,
glyphMetrics
);
double designToEm = _emSize * scalingFactor / glyphTypeface.DesignEmHeight;
for (int i = 0; i < characterLength; i++)
{
advanceWidthsUnshaped[i] = (int)Math.Round(glyphMetrics[i].AdvanceWidth * designToEm);
}
BufferCache.ReleaseGlyphMetrics(glyphMetrics);
}
}
/// <summary>
/// Map characters by font family
/// </summary>
/// <remarks>
/// Advance:
/// number of characters not mapped to missing glyph
///
/// NextValid:
/// Offset to the nearest first character not mapped to missing glyph
///
/// [Number of invalid characters following valid ones] = NextValid - Advance
///
/// A B C D E F G H x x x x x F G H I J
/// --------------->
/// Advance
///
/// ------------------------->
/// NextValid
///
/// </remarks>
private int MapByFontFamily(
CharacterBufferRange unicodeString,
CultureInfo culture,
CultureInfo digitCulture,
IFontFamily fontFamily,
CanonicalFontFamilyReference canonicalFamilyReference,
FontStyle canonicalStyle,
FontWeight canonicalWeight,
FontStretch canonicalStretch,
ref PhysicalFontFamily firstValidFamily,
ref int firstValidLength,
IDeviceFont deviceFont,
double scaleInEm,
int recursionDepth,
SpanVector scaledTypefaceSpans,
int firstCharIndex,
out int nextValid
)
{
// This is the *one* place where we check for the font mapping depths of the font linking
// process. This protects the linking process against extremely long chain of linking or
// circular dependencies in the composite fonts.
if (recursionDepth >= MaxTypefaceMapDepths)
{
// Stop the recursion. In effect, this FontFamily does not map any of the input.
// Higher-level code must map the input text to some other FontFamily, or to the
// "null font" if there is no valid FontFamily.
nextValid = 0;
return 0;
}
// If a device font is not already specified higher up the stack, look for a device font
// for this font family that matches the typeface style, weight, and stretch.
if (deviceFont == null)
{
deviceFont = fontFamily.GetDeviceFont(_canonicalStyle, _canonicalWeight, _canonicalStretch);
}
DigitMap digitMap = new DigitMap(digitCulture);
int advance = 0;
int cchAdvance;
int cchNextValid;
int ich = 0;
nextValid = 0;
bool terminated = false;
while (ich < unicodeString.Length && !terminated)
{
// Determine length of run with consistent mapping. Start by assuming we'll be able to
// use the whole string, then reduce to the length that can be mapped consistently.
int cchMap = unicodeString.Length - ich;
// Determine whether the run is using a device font, and limit the run to the
// first boundary between device/non-device font usage.
bool useDeviceFont = false;
if (deviceFont != null)
{
// Determine whether the first run uses a device font by inspecting the first character.
// We do not support device fonts for codepoints >= U+10000 (aka surrogates), so we
// don't need to call Classification.UnicodeScalar.
useDeviceFont = deviceFont.ContainsCharacter(digitMap[unicodeString[ich]]);
// Advance as long as 'useDeviceFont' remains unchanged.
int i = ich + 1;
while ( (i < unicodeString.Length)
&& (useDeviceFont == deviceFont.ContainsCharacter(digitMap[unicodeString[i]])))
{
i++;
}
cchMap = i - ich;
}
// Map as many characters to a family as we can up to the limit (cchMap) just determined.
string targetFamilyName;
double mapSizeInEm;
bool isCompositeFontFamily = fontFamily.GetMapTargetFamilyNameAndScale(
new CharacterBufferRange(
unicodeString,
ich,
cchMap
),
culture,
digitCulture,
scaleInEm,
out cchMap,
out targetFamilyName,
out mapSizeInEm
);
Debug.Assert(cchMap <= unicodeString.Length - ich);
CharacterBufferRange mappedString = new CharacterBufferRange(
unicodeString,
ich,
cchMap
);
if (!isCompositeFontFamily)
{
// not a composite font family
cchAdvance = MapByFontFaceFamily(
mappedString,
culture,
digitCulture,
fontFamily,
canonicalStyle,
canonicalWeight,
canonicalStretch,
ref firstValidFamily,
ref firstValidLength,
useDeviceFont ? deviceFont : null,
false, // nullFont
mapSizeInEm,
scaledTypefaceSpans,
firstCharIndex + ich,
false, // ignoreMissing
out cchNextValid
);
}
else if (!string.IsNullOrEmpty(targetFamilyName))
{
// The base Uri used for resolving target family names is the Uri of the composite font.
Uri baseUri = (canonicalFamilyReference != null) ? canonicalFamilyReference.LocationUri : null;
// map to the target of the family map
cchAdvance = MapByFontFamilyName(
mappedString,
culture,
digitCulture,
targetFamilyName,
baseUri,
ref firstValidFamily,
ref firstValidLength,
useDeviceFont ? deviceFont : null,
mapSizeInEm,
recursionDepth + 1, // increment the depth
scaledTypefaceSpans,
firstCharIndex + ich,
out cchNextValid
);
}
else
{
// family map lookup returned no target family
cchAdvance = 0;
cchNextValid = cchMap;
}
int cchValid = cchMap;
int cchInvalid = 0;
cchValid = cchAdvance;
cchInvalid = cchNextValid;
if(cchValid < cchMap)
{
terminated = true;
}
advance += cchValid;
nextValid = ich + cchInvalid;
ich += cchValid;
}
return advance;
}
/// <summary>
/// Construct a CultureSpecificCharacterBufferRange class
/// </summary>
public CultureSpecificCharacterBufferRange(CultureInfo culture, CharacterBufferRange characterBufferRange)
{
_culture = culture;
_characterBufferRange = characterBufferRange;
}
/// <summary>
/// Maps characters that could not be resolved to any font family either to the first
/// valid physical font family or to the default font we use for display null glyphs.
/// </summary>
private int MapUnresolvedCharacters(
CharacterBufferRange unicodeString,
CultureInfo culture,
CultureInfo digitCulture,
PhysicalFontFamily firstValidFamily,
ref int firstValidLength,
SpanVector scaledTypefaceSpans,
int firstCharIndex,
out int nextValid
)
{
// If we have a valid font family use it. We don't set nullFont to true in this case.
// We may end up displaying missing glyphs, but we don't need to force it.
IFontFamily fontFamily = firstValidFamily;
bool nullFont = false;
if (firstValidLength <= 0)
{
// We didn't find any valid physical font family so use the default "Arial", and
// set nullFont to true to ensure that we always display missing glyphs.
fontFamily = FontFamily.LookupFontFamily(FontFamily.NullFontFamilyCanonicalName);
Invariant.Assert(fontFamily != null);
nullFont = true;
}
return MapByFontFaceFamily(
unicodeString,
culture,
digitCulture,
fontFamily,
_canonicalStyle,
_canonicalWeight,
_canonicalStretch,
ref firstValidFamily,
ref firstValidLength,
null, // device font
nullFont,
1.0,
scaledTypefaceSpans,
firstCharIndex,
true, // ignore missing
out nextValid
);
}
/// <summary>
/// Fetch cached textrun
/// </summary>
internal TextRun FetchTextRun(
FormatSettings settings,
int cpFetch,
int cpFirst,
out int offsetToFirstCp,
out int runLength
)
{
SpanRider textRunSpanRider = new SpanRider(_textRunVector, _latestPosition, cpFetch);
_latestPosition = textRunSpanRider.SpanPosition;
TextRun textRun = (TextRun)textRunSpanRider.CurrentElement;
if(textRun == null)
{
// run not already cached, fetch new run and cache it
textRun = settings.TextSource.GetTextRun(cpFetch);
if (textRun.Length < 1)
{
throw new ArgumentOutOfRangeException("textRun.Length", SR.Get(SRID.ParameterMustBeGreaterThanZero));
}
Plsrun plsrun = TextRunInfo.GetRunType(textRun);
if (plsrun == Plsrun.Text || plsrun == Plsrun.InlineObject)
{
TextRunProperties properties = textRun.Properties;
if (properties == null)
throw new ArgumentException(SR.Get(SRID.TextRunPropertiesCannotBeNull));
if (properties.FontRenderingEmSize <= 0)
throw new ArgumentException(SR.Get(SRID.PropertyOfClassMustBeGreaterThanZero, "FontRenderingEmSize", "TextRunProperties"));
double realMaxFontRenderingEmSize = Constants.RealInfiniteWidth / Constants.GreatestMutiplierOfEm;
if (properties.FontRenderingEmSize > realMaxFontRenderingEmSize)
throw new ArgumentException(SR.Get(SRID.PropertyOfClassCannotBeGreaterThan, "FontRenderingEmSize", "TextRunProperties", realMaxFontRenderingEmSize));
CultureInfo culture = CultureMapper.GetSpecificCulture(properties.CultureInfo);
if (culture == null)
throw new ArgumentException(SR.Get(SRID.PropertyOfClassCannotBeNull, "CultureInfo", "TextRunProperties"));
if (properties.Typeface == null)
throw new ArgumentException(SR.Get(SRID.PropertyOfClassCannotBeNull, "Typeface", "TextRunProperties"));
}
//
// TextRun is specifial to SpanVector because TextRun also encodes position which needs to be
// consistent with the positions encoded by SpanVector. In run cache, the begining of a span
// should always correspond to the begining of a cached text run. If the end of the currently fetched
// run overlaps with the begining of an already cached run, the begining of the cached run needs to be
// adjusted as well as its span. Because we can't gurantee the correctness of the overlapped range
// so we'll simply remove the overlapped runs here.
//
// Move the rider to the end of the current run
textRunSpanRider.At(cpFetch + textRun.Length - 1);
_latestPosition = textRunSpanRider.SpanPosition;
if (textRunSpanRider.CurrentElement != _textRunVector.Default)
{
// The end overlaps with one or more cached runs, clear the range from the
// begining of the current fetched run to the end of the last overlapped cached run.
_latestPosition = _textRunVector.SetReference(
cpFetch,
textRunSpanRider.CurrentPosition + textRunSpanRider.Length - cpFetch,
_textRunVector.Default,
_latestPosition
);
}
_latestPosition = _textRunVector.SetReference(cpFetch, textRun.Length, textRun, _latestPosition);
// Refresh the rider's SpanPosition following previous SpanVector.SetReference calls
textRunSpanRider.At(_latestPosition, cpFetch);
}
offsetToFirstCp = textRunSpanRider.CurrentPosition - textRunSpanRider.CurrentSpanStart;
runLength = textRunSpanRider.Length;
Debug.Assert(textRun != null && runLength > 0, "Invalid run!");
bool isText = textRun is ITextSymbols;
if (isText)
{
// Chop text run to optimal length so we dont spend forever analysing
// them all at once.
int looseCharLength = TextStore.TypicalCharactersPerLine - cpFetch + cpFirst;
if(looseCharLength <= 0)
{
// this line already exceeds typical line length, incremental fetch goes
// about a quarter of the typical length.
looseCharLength = (int)Math.Round(TextStore.TypicalCharactersPerLine * 0.25);
}
if(runLength > looseCharLength)
{
if (TextRunInfo.GetRunType(textRun) == Plsrun.Text)
{
//
// When chopping the run at the typical line length,
// - don't chop in between of higher & lower surrogate
// - don't chop combining mark away from its base character
// - don't chop joiner from surrounding characters
//
// Starting from the initial chopping point, we look ahead to find a safe position. We stop at
// a limit in case the run consists of many combining mark & joiner. That is rare and doesn't make
// much sense in shaping already.
//
CharacterBufferReference charBufferRef = textRun.CharacterBufferReference;
// We look ahead by one more line at most. It is not normal to have
// so many combining mark or joiner characters in a row. It doesn't make sense to
// look further if so.
int lookAheadLimit = Math.Min(runLength, looseCharLength + TextStore.TypicalCharactersPerLine);
int sizeOfChar = 0;
int endOffset = 0;
bool canBreakAfterPrecedingChar = false;
for (endOffset = looseCharLength - 1; endOffset < lookAheadLimit; endOffset += sizeOfChar)
{
CharacterBufferRange charString = new CharacterBufferRange(
charBufferRef.CharacterBuffer,
charBufferRef.OffsetToFirstChar + offsetToFirstCp + endOffset,
runLength - endOffset
);
int ch = Classification.UnicodeScalar(charString, out sizeOfChar);
// We can only safely break if the preceding char is not a joiner character (i.e. can-break-after),
// and the current char is not combining or joiner (i.e. can-break-before).
if (canBreakAfterPrecedingChar && !Classification.IsCombining(ch) && !Classification.IsJoiner(ch) )
{
break;
}
canBreakAfterPrecedingChar = !Classification.IsJoiner(ch);
}
looseCharLength = Math.Min(runLength, endOffset);
}
runLength = looseCharLength;
}
}
Debug.Assert(
// valid run found
runLength > 0
// non-text run always fetched at run start
&& ( isText
|| textRunSpanRider.CurrentSpanStart - textRunSpanRider.CurrentPosition == 0)
// span rider of both text and format point to valid position
&& (textRunSpanRider.Length > 0 && textRunSpanRider.CurrentElement != null),
"Text run fetching error!"
);
return textRun;
}
/// <summary>
/// Map characters by font family name
/// </summary>
private int MapByFontFamilyName(
CharacterBufferRange unicodeString,
CultureInfo culture,
CultureInfo digitCulture,
string familyName,
Uri baseUri,
ref PhysicalFontFamily firstValidFamily,
ref int firstValidLength,
IDeviceFont deviceFont,
double scaleInEm,
int fontMappingDepth,
SpanVector scaledTypefaceSpans,
int firstCharIndex,
out int nextValid
)
{
if (familyName == null)
{
return MapUnresolvedCharacters(
unicodeString,
culture,
digitCulture,
firstValidFamily,
ref firstValidLength,
scaledTypefaceSpans,
firstCharIndex,
out nextValid
);
}
else
{
// Map as many characters as we can to families in the list.
return MapByFontFamilyList(
unicodeString,
culture,
digitCulture,
new FontFamily[] { new FontFamily(baseUri, familyName) },
ref firstValidFamily,
ref firstValidLength,
deviceFont,
scaleInEm,
fontMappingDepth,
scaledTypefaceSpans,
firstCharIndex,
out nextValid
);
}
}
/// <summary>
/// Scan through specified character string checking for valid character
/// nominal glyph.
/// </summary>
/// <param name="charBufferRange">character buffer range</param>
/// <param name="emSize">height of Em</param>
/// <param name="scalingFactor">This is the factor by which we will scale up
/// the metrics. Typically this value to used to convert metrics from the real
/// space to the ideal space</param>
/// <param name="widthMax">maximum width allowed</param>
/// <param name="keepAWord">do not stop arbitrarily in the middle of a word</param>
/// <param name="numberSubstitution">digits require complex shaping</param>
/// <param name="cultureInfo">CultureInfo of the text</param>
/// <param name="textFormattingMode">The TextFormattingMode used (Ideal vs. Display)</param>
/// <param name="isSideways">Indicates whether to rotate glyphs.</param>
/// <param name="breakOnTabs">Determines whether to stop checking at a tab and
/// break the run there</param>
/// <param name="stringLengthFit">number of character fit in given width</param>
/// <returns>whether the specified string can be optimized by nominal glyph lookup</returns>
internal bool CheckFastPathNominalGlyphs(
CharacterBufferRange charBufferRange,
double emSize,
double scalingFactor,
double widthMax,
bool keepAWord,
bool numberSubstitution,
CultureInfo cultureInfo,
TextFormattingMode textFormattingMode,
bool isSideways,
bool breakOnTabs,
out int stringLengthFit
)
{
stringLengthFit = 0;
if (CachedTypeface.NullFont)
{
return(false);
}
GlyphTypeface glyphTypeface = TryGetGlyphTypeface();
if (glyphTypeface == null)
{
return(false);
}
double totalWidth = 0;
int i = 0;
ushort blankGlyph = glyphTypeface.BlankGlyphIndex;
ushort glyph = blankGlyph;
ushort charFlagsMask = numberSubstitution ?
(ushort)(CharacterAttributeFlags.CharacterComplex | CharacterAttributeFlags.CharacterDigit) :
(ushort)CharacterAttributeFlags.CharacterComplex;
ushort charFlags = 0;
ushort charFastTextCheck = (ushort)(CharacterAttributeFlags.CharacterFastText | CharacterAttributeFlags.CharacterIdeo);
bool symbolTypeface = glyphTypeface.Symbol;
if (symbolTypeface)
{
// we don't care what code points are present if it's a non-Unicode font such as Symbol or Wingdings;
// the code points don't have any standardized meanings, and we always want to bypass shaping
charFlagsMask = 0;
}
bool ignoreWidths = widthMax == double.MaxValue;
ushort[] glyphIndices = BufferCache.GetUShorts(charBufferRange.Length);
MS.Internal.Text.TextInterface.GlyphMetrics[] glyphMetrics = ignoreWidths ? null : BufferCache.GetGlyphMetrics(charBufferRange.Length);
glyphTypeface.GetGlyphMetricsOptimized(charBufferRange,
emSize,
glyphIndices,
glyphMetrics,
textFormattingMode,
isSideways
);
double designToEm = emSize / glyphTypeface.DesignEmHeight;
//
// This block will advance until one of:
// 1. The end of the charBufferRange is reached
// 2. The charFlags have some of the charFlagsMask values
// 3. The glyph is BlankGlyph (space)
// 4. Glyph index is 0 (unless symbol font)
//
// At this point totalWidth includes all of the widths including the stop character (which fits above)
// i indexes the next character (not included in the width)
//
if (keepAWord)
{
do
{
char ch = charBufferRange[i++];
if (ch == TextStore.CharLineFeed || ch == TextStore.CharCarriageReturn || (breakOnTabs && ch == TextStore.CharTab))
{
--i;
break;
}
else
{
int charClass = (int)Classification.GetUnicodeClassUTF16(ch);
charFlags = Classification.CharAttributeOf(charClass).Flags;
charFastTextCheck &= charFlags;
glyph = glyphIndices[i - 1];
if (!ignoreWidths)
{
totalWidth += TextFormatterImp.RoundDip(glyphMetrics[i - 1].AdvanceWidth * designToEm, textFormattingMode) * scalingFactor;
}
}
} while(
i < charBufferRange.Length &&
((charFlags & charFlagsMask) == 0) &&
(glyph != 0 || symbolTypeface) &&
glyph != blankGlyph
);
// i is now at a character immediately following a leading blank
}
//
// This block will advance until one of:
// 1. The end of the charBufferRange is reached
// 2. The charFlags have some of the charFlagsMask values
// 3. Glyph index is 0 (unless symbol font)
// 4. totalWidth > widthMax
//
while (
i < charBufferRange.Length &&
(ignoreWidths || totalWidth <= widthMax) &&
((charFlags & charFlagsMask) == 0) &&
(glyph != 0 || symbolTypeface)
)
{
char ch = charBufferRange[i++];
if (ch == TextStore.CharLineFeed || ch == TextStore.CharCarriageReturn || (breakOnTabs && ch == TextStore.CharTab))
{
--i;
break;
}
else
{
int charClass = (int)Classification.GetUnicodeClassUTF16(ch);
charFlags = Classification.CharAttributeOf(charClass).Flags;
charFastTextCheck &= charFlags;
glyph = glyphIndices[i - 1];
if (!ignoreWidths)
{
totalWidth += TextFormatterImp.RoundDip(glyphMetrics[i - 1].AdvanceWidth * designToEm, textFormattingMode) * scalingFactor;
}
}
}
BufferCache.ReleaseUShorts(glyphIndices);
glyphIndices = null;
BufferCache.ReleaseGlyphMetrics(glyphMetrics);
glyphMetrics = null;
if (symbolTypeface)
{
// always optimize for non-Unicode font as we don't support shaping or typographic features;
// we also don't fall back from non-Unicode fonts so we don't care if there are missing glyphs
stringLengthFit = i;
return(true);
}
if (glyph == 0)
{
// character is not supported by the font
return(false);
}
if ((charFlags & charFlagsMask) != 0)
{
// complex character encountered, exclude it
Debug.Assert(i > 0);
if (--i <= 0)
{
// first char is complex, fail the call
return(false);
}
}
stringLengthFit = i;
TypographyAvailabilities typography = glyphTypeface.FontFaceLayoutInfo.TypographyAvailabilities;
if ((charFastTextCheck & (byte)CharacterAttributeFlags.CharacterFastText) != 0)
{
// all input code points are Fast Text
if ((typography &
(TypographyAvailabilities.FastTextTypographyAvailable
| TypographyAvailabilities.FastTextMajorLanguageLocalizedFormAvailable
)
) != 0
)
{
// Considered too risky to optimize. It is either because the font
// has required features or the font has 'locl' lookup for major languages.
return(false);
}
else if ((typography & TypographyAvailabilities.FastTextExtraLanguageLocalizedFormAvailable) != 0)
{
// The font has 'locl' lookup for FastText code points for non major languages.
// Check whether the input is major langauge. If it is, we are still good to optimize.
return(MajorLanguages.Contains(cultureInfo));
}
else
{
// No FastText flags are present, safe to optimize
return(true);
}
}
else if ((charFastTextCheck & (byte)CharacterAttributeFlags.CharacterIdeo) != 0)
{
// The input are all ideographs, check the IdeoTypographyAvailable bit. It is safe if
// the bit is not set.
return((typography & TypographyAvailabilities.IdeoTypographyAvailable) == 0);
}
else
{
// for all the rest of the cases, just check whether there is any required typography
// present at all. If none exists, it is optimizable. We might under-optimize here but
// it will be non-major languages.
return((typography & TypographyAvailabilities.Available) == 0);
}
}
/// <summary>
/// Maps as may characters as it can (or *all* characters if recursionDepth == 0) to
/// font families in the specified FontFamilyList.
/// </summary>
private int MapByFontFamilyList(
CharacterBufferRange unicodeString,
CultureInfo culture,
CultureInfo digitCulture,
FontFamily[] familyList,
ref PhysicalFontFamily firstValidFamily,
ref int firstValidLength,
IDeviceFont deviceFont,
double scaleInEm,
int recursionDepth,
SpanVector scaledTypefaceSpans,
int firstCharIndex,
out int nextValid
)
{
int advance = 0;
int cchAdvance;
int cchNextValid = 0;
int ich = 0;
nextValid = 0;
while (ich < unicodeString.Length)
{
cchAdvance = MapOnceByFontFamilyList(
new CharacterBufferRange(
unicodeString,
ich,
unicodeString.Length - ich
),
culture,
digitCulture,
familyList,
ref firstValidFamily,
ref firstValidLength,
deviceFont,
scaleInEm,
recursionDepth,
scaledTypefaceSpans,
firstCharIndex + ich,
out cchNextValid
);
if (cchAdvance <= 0)
{
// We could not map any characters. If this is a recursive call then it's OK to
// exit the loop without mapping all the characters; the caller may be able to
// map the text to some other font family.
if (recursionDepth > 0)
break;
Debug.Assert(cchNextValid > 0 && cchNextValid <= unicodeString.Length - ich);
// The top-level call has to map all the input.
cchAdvance = MapUnresolvedCharacters(
new CharacterBufferRange(
unicodeString,
ich,
cchNextValid
),
culture,
digitCulture,
firstValidFamily,
ref firstValidLength,
scaledTypefaceSpans,
firstCharIndex + ich,
out cchNextValid
);
Debug.Assert(cchNextValid == 0);
}
ich += cchAdvance;
}
advance += ich;
nextValid = ich + cchNextValid;
// The top-level call must map all the input; recursive calls map only what they can.
Debug.Assert(recursionDepth > 0 || advance == unicodeString.Length);
return advance;
}
/// <summary>
/// Get spans of index to the list of scaled shapeable typeface of the specified
/// character string from the map table
/// </summary>
private bool GetCachedScaledTypefaceMap(
CharacterBufferRange unicodeString,
CultureInfo culture,
CultureInfo digitCulture,
ref SpanVector<int> cachedScaledTypefaceIndexSpans,
int ichItem
)
{
IntMap map;
if (!_intMaps.TryGetValue(culture, out map))
{
return false;
}
DigitMap digitMap = new DigitMap(digitCulture);
int ich = 0;
while (ich < unicodeString.Length)
{
// Get map entry for first character.
int sizeofChar;
int ch = digitMap[
Classification.UnicodeScalar(
new CharacterBufferRange(unicodeString, ich, unicodeString.Length - ich),
out sizeofChar
)
];
ushort firstIndex = map[ch];
if (firstIndex == 0)
return false;
// Advance past subsequent characters with the same mapping.
int cchSpan = sizeofChar;
for (; ich + cchSpan < unicodeString.Length; cchSpan += sizeofChar)
{
ch = digitMap[
Classification.UnicodeScalar(
new CharacterBufferRange(unicodeString, ich + cchSpan, unicodeString.Length - ich - cchSpan),
out sizeofChar
)
];
if (map[ch] != firstIndex && !Classification.IsCombining(ch) && !Classification.IsJoiner(ch))
break;
}
// map entry is stored in index+1, since 0 indicates uninitialized entry
cachedScaledTypefaceIndexSpans.Set(ichItem + ich, cchSpan, firstIndex - 1);
ich += cchSpan;
}
return true;
}
internal void GetShapeableText(
CharacterBufferReference characterBufferReference,
int stringLength,
TextRunProperties textRunProperties,
CultureInfo digitCulture,
bool isRightToLeftParagraph,
IList<TextShapeableSymbols> shapeableList,
IShapeableTextCollector collector,
TextFormattingMode textFormattingMode
)
{
SpanVector<int> cachedScaledTypefaceIndexSpans;
int ichItem = 0;
CharacterBufferRange unicodeString = new CharacterBufferRange(
characterBufferReference,
stringLength
);
CultureInfo culture = textRunProperties.CultureInfo;
IList<Span> spans;
GCHandle gcHandle;
IntPtr ptext = characterBufferReference.CharacterBuffer.PinAndGetCharacterPointer(characterBufferReference.OffsetToFirstChar, out gcHandle);
// Contextual number substitution cannot be performed on the run level, since it depends
// on context - nearest preceding strong character. For this reason, contextual number
// substitutions has been already done (TextStore.CreateLSRunsUniformBidiLevel) and
// digitCulture has been updated to reflect culture which is dependent on the context.
// NumberSubstitutionMethod.AsCulture method can be resolved to Context, hence it also needs to be resolved to appropriate
// not ambiguous method.
// Both of those values (Context and AsCulture) are resolved to one of following: European, Traditional or NativeNational,
// which can be safely handled by DWrite without getting context information.
bool ignoreUserOverride;
NumberSubstitutionMethod numberSubstitutionMethod = DigitState.GetResolvedSubstitutionMethod(textRunProperties, digitCulture, out ignoreUserOverride);
// Itemize the text based on DWrite's text analysis for scripts and number substitution.
unsafe
{
checked
{
spans = MS.Internal.Text.TextInterface.TextAnalyzer.Itemize(
(ushort*)ptext.ToPointer(),
(uint)stringLength,
culture,
MS.Internal.FontCache.DWriteFactory.Instance,
isRightToLeftParagraph,
digitCulture,
ignoreUserOverride,
(uint)numberSubstitutionMethod,
ClassificationUtility.Instance,
UnsafeNativeMethods.CreateTextAnalysisSink,
UnsafeNativeMethods.GetScriptAnalysisList,
UnsafeNativeMethods.GetNumberSubstitutionList,
UnsafeNativeMethods.CreateTextAnalysisSource
);
}
}
characterBufferReference.CharacterBuffer.UnpinCharacterPointer(gcHandle);
SpanVector itemSpans = new SpanVector(null, new FrugalStructList<Span>((ICollection<Span>)spans));
cachedScaledTypefaceIndexSpans = new SpanVector<int>(-1);
foreach(Span itemSpan in itemSpans)
{
MapItem(
new CharacterBufferRange(
unicodeString,
ichItem,
itemSpan.length
),
culture,
itemSpan,
ref cachedScaledTypefaceIndexSpans,
ichItem
);
#if DEBUG
ValidateMapResult(
ichItem,
itemSpan.length,
ref cachedScaledTypefaceIndexSpans
);
#endif
ichItem += itemSpan.length;
}
Debug.Assert(ichItem == unicodeString.Length);
// intersect item spans with shapeable spans to create span of shapeable runs
int ich = 0;
SpanRider itemSpanRider = new SpanRider(itemSpans);
SpanRider<int> typefaceIndexSpanRider = new SpanRider<int>(cachedScaledTypefaceIndexSpans);
while(ich < unicodeString.Length)
{
itemSpanRider.At(ich);
typefaceIndexSpanRider.At(ich);
int index = typefaceIndexSpanRider.CurrentValue;
Debug.Assert(index >= 0);
int cch = unicodeString.Length - ich;
cch = Math.Min(cch, itemSpanRider.Length);
cch = Math.Min(cch, typefaceIndexSpanRider.Length);
ScaledShapeTypeface scaledShapeTypeface = _cachedScaledTypefaces[index];
collector.Add(
shapeableList,
new CharacterBufferRange(
unicodeString,
ich,
cch
),
textRunProperties,
(MS.Internal.Text.TextInterface.ItemProps)itemSpanRider.CurrentElement,
scaledShapeTypeface.ShapeTypeface,
scaledShapeTypeface.ScaleInEm,
scaledShapeTypeface.NullShape,
textFormattingMode
);
ich += cch;
}
}
