/// <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);
}
/// <summary>
/// Contruct lexical chunk from character analysis
/// </summary>
internal LexicalChunk(
TextLexicalBreaks breaks,
SpanVector <int> ichVector
)
{
Invariant.Assert(breaks != null);
_breaks = breaks;
_ichVector = ichVector;
}
/// <summary>
/// Contruct lexical chunk from character analysis
/// </summary>
internal LexicalChunk(
TextLexicalBreaks breaks,
SpanVector<int> ichVector
)
{
Invariant.Assert(breaks != null);
_breaks = breaks;
_ichVector = ichVector;
}
/// <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>
/// Convert the specified external CP to LSCP corresponding to a possible break position for optimal break.
/// </summary>
/// <remarks>
/// There is a generic issue that one CP could map to multiple LSCPs when it comes to
/// lsrun that occupies no actual CP. Such lsrun is generated by line layout during
/// formatting to accomplsih specific purpose i.e. run representing open and close
/// reverse object or a fake-linebreak lsrun.
///
/// According to SergeyGe and Antons, LS will never breaks immediately after open reverse
/// or immediately before close reverse. It also never break before a linebreak character.
///
/// Therefore, it is safe to make an assumption here that one CP will indeed map to one
/// LSCP given being the LSCP before the open reverse and the LSCP after the close reverse.
/// Never the vice-versa.
///
/// This is the reason why the loop inside this method may overread the PLSRUN span by
/// one span at the end. The loop is designed to skip over all the lsruns with zero CP
/// which is not the open reverse.
///
/// This logic is exactly the same as the one used by FullTextLine.PrefetchLSRuns. Any
/// attempt to change it needs to be thoroughly reviewed. The same logic is to be applied
/// accordingly on PrefetchLSRuns.
///
/// [Wchao, 5-24-2005]
///
/// </remarks>
internal int GetBreakpointInternalCp(int cp)
{
int ccp = cp - _store.CpFirst;
int lscp = _store.CpFirst;
int ccpCurrent = 0;
SpanVector plsrunVector = _store.PlsrunVector;
LSRun lsrun;
int i = 0;
int lastSpanLength = 0;
int lastRunLength = 0;
do
{
Span span = plsrunVector[i];
Plsrun plsrun = (Plsrun)span.element;
lsrun = _store.GetRun(plsrun);
if (ccp == ccpCurrent && lsrun.Type == Plsrun.Reverse)
{
break;
}
lastSpanLength = span.length;
lastRunLength = (plsrun >= Plsrun.FormatAnchor ? lsrun.Length : 0);
lscp += lastSpanLength;
ccpCurrent += lastRunLength;
} while (++i < plsrunVector.Count &&
lsrun.Type != Plsrun.ParaBreak &&
ccp >= ccpCurrent
);
// Since we may overread the span vector by one span,
// we need to subtract the accumulated lscp by the number of cp we may have overread.
if (ccpCurrent == ccp || lastSpanLength == lastRunLength)
{
return(lscp - ccpCurrent + ccp);
}
Invariant.Assert(ccpCurrent - ccp == lastRunLength);
return(lscp - lastSpanLength);
}
/// <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
));
}
private unsafe void ValidateMapResult(
int ichRange,
int cchRange,
ref SpanVector <int> cachedScaledTypefaceIndexSpans
)
{
int ich = 0;
SpanRider <int> typefaceIndexSpanRider = new SpanRider <int>(cachedScaledTypefaceIndexSpans);
while (ich < cchRange)
{
typefaceIndexSpanRider.At(ichRange + ich);
if ((int)typefaceIndexSpanRider.CurrentValue < 0)
{
Debug.Assert(false, "Invalid font face spans");
return;
}
int cch = Math.Min(cchRange - ich, typefaceIndexSpanRider.Length);
ich += cch;
}
}
/// <summary>
/// Default constructor used internally
/// </summary>
/// <remarks>
/// Text layout client never create their own run cache as its implementation
/// should be opaque to them.
/// </remarks>
internal TextRunCacheImp()
{
_textRunVector = new SpanVector(null);
_latestPosition = new SpanPosition();
}
/// <summary>
/// Default constructor used internally
/// </summary>
/// <remarks>
/// Text layout client never create their own run cache as its implementation
/// should be opaque to them.
/// </remarks>
internal TextRunCacheImp()
{
_textRunVector = new SpanVector(null);
_latestPosition = new SpanPosition();
}
/// <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);
}
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;
}
}
/// <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>
/// 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>
/// 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;
}
}
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
);
}
}
