internal TextAnalyzerSource(char *text, uint length, string culture,
IDWriteFactory factory, bool isRightToLeft, string numberCulture,
bool ignoreUserOverride, uint numberSubstitutionMethod)
{
pText = text;
TextLength = length;
NumberSubstitution = factory.CreateNumberSubstitution(numberSubstitutionMethod, numberCulture, ignoreUserOverride);
PinnedLocaleName = GCHandle.Alloc(culture, GCHandleType.Pinned);
ReadingDirection = isRightToLeft ? DWriteReadingDirection.RightToLeft : DWriteReadingDirection.LeftToRight;
}
internal TextAnalyzerSource(char *text, uint length, string culture,
IDWriteFactory factory, bool isRightToLeft, string numberCulture,
bool ignoreUserOverride, uint numberSubstitutionMethod)
{
var segment = new TextSegment();
segment.ptr = new IntPtr(text);
segment.start = 0;
segment.end = length;
TextSegments = new TextSegment[] { segment };
TextLength = length;
NumberSubstitution = factory.CreateNumberSubstitution(numberSubstitutionMethod, numberCulture, ignoreUserOverride);
PinnedLocaleName = GCHandle.Alloc(culture, GCHandleType.Pinned);
ReadingDirection = isRightToLeft ? DWriteReadingDirection.RightToLeft : DWriteReadingDirection.LeftToRight;
}
internal TextAnalyzerSource(IntPtr[] text_ptrs, uint[] lengths, string culture,
IDWriteFactory factory, bool isRightToLeft, string numberCulture,
bool ignoreUserOverride, uint numberSubstitutionMethod)
{
TextSegments = new TextSegment[text_ptrs.Length];
uint pos = 0;
for (int i = 0; i < text_ptrs.Length; i++)
{
var segment = new TextSegment();
segment.ptr = text_ptrs[i];
segment.start = pos;
pos += lengths[i];
segment.end = pos;
TextSegments[i] = segment;
}
TextLength = pos;
NumberSubstitution = factory.CreateNumberSubstitution(numberSubstitutionMethod, numberCulture, ignoreUserOverride);
PinnedLocaleName = GCHandle.Alloc(culture, GCHandleType.Pinned);
ReadingDirection = isRightToLeft ? DWriteReadingDirection.RightToLeft : DWriteReadingDirection.LeftToRight;
}
public ItemProps(
DWriteScriptAnalysis?scriptAnalysis,
IDWriteNumberSubstitution numberSubstitution,
CultureInfo digitCulture,
bool hasCombiningMark,
bool needsCaretInfo,
bool hasExtendedCharacter,
bool isIndic,
bool isLatin
)
{
DigitCulture = digitCulture;
HasCombiningMark = hasCombiningMark;
HasExtendedCharacter = hasExtendedCharacter;
NeedsCaretInfo = needsCaretInfo;
IsIndic = isIndic;
IsLatin = isLatin;
ScriptAnalysis = scriptAnalysis;
NumberSubstitution = numberSubstitution;
}
public void SetNumberSubstitution(uint position, uint length, IDWriteNumberSubstitution substitution)
{
NumberSubstitution.Add(new TextAnalysisRange <IDWriteNumberSubstitution>((int)position, (int)length, substitution));
}
public void GetNumberSubstitution(uint position, out uint text_len, out IDWriteNumberSubstitution substitution)
{
text_len = TextLength - position;
substitution = NumberSubstitution;
}
public IList <Span> Itemize(CultureInfo numberCulture, CharAttribute[] pCharAttribute)
{
var result = new List <Span>();
int textIndex = 0;
int scriptAnalysisIndex = 0;
int numberSubstitutionIndex = 0;
int isDigitIndex = 0;
while (true)
{
if (textIndex >= ScriptAnalysisRanges[scriptAnalysisIndex].TextEnd)
{
scriptAnalysisIndex++;
if (scriptAnalysisIndex >= ScriptAnalysisRanges.Count)
{
break;
}
}
int spanEnd = ScriptAnalysisRanges[scriptAnalysisIndex].TextEnd;
var scriptAnalysis = ScriptAnalysisRanges[scriptAnalysisIndex].Value;
IDWriteNumberSubstitution numberSubstitution = null;
if (numberSubstitutionIndex < NumberSubstitutionRanges.Count)
{
if (textIndex >= NumberSubstitutionRanges[numberSubstitutionIndex].TextEnd)
{
numberSubstitutionIndex++;
}
if (numberSubstitutionIndex < NumberSubstitutionRanges.Count)
{
var range = NumberSubstitutionRanges[numberSubstitutionIndex];
if (textIndex < range.TextPosition)
{
// Before start of range
if (spanEnd > range.TextPosition)
{
spanEnd = range.TextPosition;
}
}
else
{
// Inside range
if (spanEnd > range.TextEnd)
{
spanEnd = range.TextEnd;
}
numberSubstitution = range.Value;
}
}
}
if (textIndex >= IsDigitRanges[isDigitIndex].TextEnd)
{
isDigitIndex++;
}
if (spanEnd > IsDigitRanges[isDigitIndex].TextEnd)
{
spanEnd = IsDigitRanges[isDigitIndex].TextEnd;
}
var isDigit = IsDigitRanges[isDigitIndex].Value;
bool hasCombiningMark = false;
for (int i = textIndex; i < spanEnd; i++)
{
if ((pCharAttribute[i] & CharAttribute.IsCombining) != 0)
{
hasCombiningMark = true;
break;
}
}
bool needsCaretInfo = true;
for (int i = textIndex; i < spanEnd; i++)
{
if (((pCharAttribute[i] & CharAttribute.IsStrong) != 0) && ((pCharAttribute[i] & CharAttribute.NeedsCaretInfo) == 0))
{
needsCaretInfo = false;
break;
}
}
int strongCharCount = 0;
int latinCount = 0;
int indicCount = 0;
bool hasExtended = false;
for (int i = textIndex; i < spanEnd; ++i)
{
if ((pCharAttribute[i] & CharAttribute.IsExtended) != 0)
{
hasExtended = true;
}
// If the current character class is Strong.
if ((pCharAttribute[i] & CharAttribute.IsStrong) != 0)
{
strongCharCount++;
if ((pCharAttribute[i] & CharAttribute.IsLatin) != 0)
{
latinCount++;
}
else if ((pCharAttribute[i] & CharAttribute.IsIndic) != 0)
{
indicCount++;
}
}
}
// Assign isIndic
// For the isIndic check we mark the run as Indic if it contains atleast
// one strong Indic character based on the old WPF 3.5 script ids.
// The isIndic flag is eventually used by LS when checking for the max cluster
// size that can form for the current run so that it can break the line properly.
// So our approach is conservative. 1 strong Indic character will make us
// communicate to LS the max cluster size possible for correctness.
bool isIndic = (indicCount > 0);
// Assign isLatin
// We mark a run to be Latin iff all the strong characters in it
// are Latin based on the old WPF 3.5 script ids.
// This is a conservative approach for correct line breaking behavior.
// Refer to the comment about isIndic above.
bool isLatin = (strongCharCount > 0) && (latinCount == strongCharCount);
ItemProps itemProps = new ItemProps(
scriptAnalysis,
numberSubstitution,
isDigit ? numberCulture : null,
hasCombiningMark,
needsCaretInfo,
hasExtended,
isIndic,
isLatin
);
result.Add(new Span(itemProps, spanEnd - textIndex));
textIndex = spanEnd;
}
return(result);
}