private static int MeasureTabScriptRun(ScriptRun* scriptRun, Style paragraphStyle, int x, bool invalidate)
{
int advanceWidth = scriptRun->ABC.abcB;
if (advanceWidth < 0 || invalidate)
{
int nextX = paragraphStyle.TabStopRuler.AdvanceToNextTabStop(x);
advanceWidth = scriptRun->ABC.abcB = nextX - x;
}
return advanceWidth;
}
private static int MeasureObjectScriptRun(ScriptRun* scriptRun)
{
return scriptRun->ABC.TotalWidth;
}
private static int MeasureTextScriptRun(ScriptParagraph* scriptParagraph, ScriptRun* scriptRun,
int truncatedLeadingCharsCount, int truncatedTrailingCharsCount,
out int glyphIndexInParagraph, out int glyphCount)
{
if (truncatedLeadingCharsCount != 0 || truncatedTrailingCharsCount != 0)
{
ushort* logicalClusters = scriptRun->CharLogicalClusters(scriptParagraph);
int startGlyphIndexInRun, endGlyphIndexInRun;
if (scriptRun->ScriptAnalysis.fRTL)
{
startGlyphIndexInRun = truncatedTrailingCharsCount != 0
? logicalClusters[scriptRun->CharCount - truncatedTrailingCharsCount] + 1
: 0;
endGlyphIndexInRun = truncatedLeadingCharsCount != 0
? logicalClusters[truncatedLeadingCharsCount] + 1
: scriptRun->GlyphCount;
}
else
{
startGlyphIndexInRun = truncatedLeadingCharsCount != 0
? logicalClusters[truncatedLeadingCharsCount]
: 0;
endGlyphIndexInRun = truncatedTrailingCharsCount != 0
? logicalClusters[scriptRun->CharCount - truncatedTrailingCharsCount]
: scriptRun->GlyphCount;
}
glyphIndexInParagraph = scriptRun->GlyphIndexInParagraph + startGlyphIndexInRun;
glyphCount = endGlyphIndexInRun - startGlyphIndexInRun;
int* glyphAdvanceWidths = scriptParagraph->GlyphAdvanceWidths + glyphIndexInParagraph;
int measuredWidth = 0;
for (int j = 0; j < glyphCount; j++)
measuredWidth += glyphAdvanceWidths[j];
return measuredWidth;
}
glyphIndexInParagraph = scriptRun->GlyphIndexInParagraph;
glyphCount = scriptRun->GlyphCount;
return scriptRun->ABC.TotalWidth;
}
private static void ScriptShapeAndPlace(IntPtr hdc, ref IntPtr scriptCache, ScriptParagraph* scriptParagraph, ScriptRun* scriptRun, char* paragraphChars)
{
int charIndexInParagraph = scriptRun->CharIndexInParagraph;
char* chars = paragraphChars + charIndexInParagraph;
int charCount = scriptRun->CharCount;
int glyphIndexInParagraph = scriptParagraph->GlyphCount;
ushort* charLogicalClusters = scriptParagraph->CharLogicalClusters + charIndexInParagraph;
SCRIPT_ANALYSIS* scriptAnalysis = &scriptRun->ScriptAnalysis;
int glyphCapacity = charCount * 3 / 2 + 16; // * 1.5 + 16 per Uniscribe recommendations for ScriptShape.
int glyphCount;
ushort* glyphs;
SCRIPT_VISATTR* glyphVisualAttributes;
int result;
for (; ; )
{
scriptParagraph->EnsureGlyphCapacityAndPreserveContents(glyphIndexInParagraph + glyphCapacity);
glyphs = scriptParagraph->Glyphs + glyphIndexInParagraph;
glyphVisualAttributes = scriptParagraph->GlyphVisualAttributes + glyphIndexInParagraph;
result = NativeMethods.ScriptShape(hdc, ref scriptCache, chars, charCount, glyphCapacity,
scriptAnalysis, glyphs, charLogicalClusters, glyphVisualAttributes,
out glyphCount);
if (result == NativeConstants.S_OK)
break;
if (result == NativeConstants.USP_E_SCRIPT_NOT_IN_FONT)
{
SCRIPT_ANALYSIS modifiedScriptAnalysis = *scriptAnalysis;
modifiedScriptAnalysis.eScript = NativeConstants.SCRIPT_UNDEFINED;
result = NativeMethods.ScriptShape(hdc, ref scriptCache, chars, charCount, glyphCapacity,
&modifiedScriptAnalysis, glyphs, charLogicalClusters, glyphVisualAttributes,
out glyphCount);
if (result == NativeConstants.S_OK)
break;
}
if (result != NativeConstants.E_OUTOFMEMORY)
Marshal.ThrowExceptionForHR(result);
glyphCapacity *= 2;
}
int* glyphAdvanceWidths = scriptParagraph->GlyphAdvanceWidths + glyphIndexInParagraph;
GOFFSET* glyphOffsets = scriptParagraph->GlyphOffsets + glyphIndexInParagraph;
result = NativeMethods.ScriptPlace(hdc, ref scriptCache, glyphs, glyphCount,
glyphVisualAttributes, scriptAnalysis, glyphAdvanceWidths, glyphOffsets, out scriptRun->ABC);
if (result != NativeConstants.S_OK)
Marshal.ThrowExceptionForHR(result);
scriptRun->GlyphIndexInParagraph = glyphIndexInParagraph;
scriptRun->GlyphCount = glyphCount;
scriptParagraph->GlyphCount += glyphCount;
}
private int* GetTempVisualToLogicalMap(ScriptRun* scriptRuns, int count)
{
tempEmbeddingLevelBuffer.EnsureCapacity(count);
byte* embeddingLevels = (byte*)tempEmbeddingLevelBuffer.GetPointer();
for (int i = 0; i < count; i++)
embeddingLevels[i] = (byte)scriptRuns[i].ScriptAnalysis.s.uBidiLevel;
tempVisualToLogicalMapBuffer.EnsureCapacity(count);
int* visualToLogicalMap = (int*)tempVisualToLogicalMapBuffer.GetPointer();
int result = NativeMethods.ScriptLayout(count, embeddingLevels, visualToLogicalMap, null);
if (result != NativeConstants.S_OK)
Marshal.ThrowExceptionForHR(result);
return visualToLogicalMap;
}
public void InitializeTruncatedCopy(ScriptRun* scriptRun, int truncatedLeadingCharsCount, int truncatedTrailingCharsCount)
{
this.run = scriptRun->run;
if (this.run.RunKind == RunKind.Text)
this.run.CharCount = scriptRun->CharCount - truncatedLeadingCharsCount - truncatedTrailingCharsCount;
ScriptAnalysis = scriptRun->ScriptAnalysis;
CharIndexInParagraph = scriptRun->CharIndexInParagraph + truncatedLeadingCharsCount;
}
