private void DrawTextLine(
DrawingContext drawingContext,
Point origin,
MatrixTransform antiInversion
)
{
Rect boundingBox = Rect.Empty;
if (_ploline.Value != System.IntPtr.Zero)
{
TextFormatterContext context;
LsErr lserr = LsErr.None;
LSRECT rect = new LSRECT(0, 0, _metrics._textWidthAtTrailing, _metrics._height);
// DrawingState needs to be properly disposed after performing actual drawing operations.
using (DrawingState drawingState = new DrawingState(drawingContext, origin, antiInversion, this))
{
context = _metrics._formatter.AcquireContext(
drawingState,
_ploc.Value
);
// set the collector and send the line to LS to draw
context.EmptyBoundingBox();
// LS line reference origin
LSPOINT lsRefOrigin = new LSPOINT(0, _metrics._baselineOffset);
lserr = UnsafeNativeMethods.LoDisplayLine(
_ploline.Value,
ref lsRefOrigin,
1, // 0 - opaque, 1 - transparent
ref rect
);
}
boundingBox = context.BoundingBox;
// get the exception in context before it is released
Exception callbackException = context.CallbackException;
context.Release();
if(lserr != LsErr.None)
{
if(callbackException != null)
{
// rethrow exception thrown in callbacks
throw callbackException;
}
else
{
// throw with LS error codes
TextFormatterContext.ThrowExceptionFromLsError(SR.Get(SRID.CreateLineFailure, lserr), lserr);
}
}
// keep context alive at least til here
GC.KeepAlive(context);
}
if (_collapsingSymbol != null)
{
// draw collapsing symbol if any
Point vectorToOrigin = new Point();
if (antiInversion != null)
{
vectorToOrigin = origin;
origin.X = origin.Y = 0;
}
boundingBox.Union(DrawCollapsingSymbol(drawingContext, origin, vectorToOrigin));
}
BuildOverhang(origin, boundingBox);
_statusFlags |= StatusFlags.BoundingBoxComputed;
}
internal unsafe LsErr DrawGlyphs(
IntPtr pols, // Line Layout context
Plsrun plsrun, // plsrun
char* pwchText, // character string
ushort* puClusterMap, // character-to-cluster map
ushort* puCharProperties, // character properties
int charCount, // character count
ushort* puGlyphs, // glyph indices
int* piJustifiedGlyphAdvances, // justified glyph advances
int* piGlyphAdvances, // original ideal glyph advances
GlyphOffset* piiGlyphOffsets, // glyph offsets
uint* piGlyphProperties, // glyph properties
LsExpType* plsExpType, // glyph expansion types
int glyphCount, // glyph count
LsTFlow textFlow, // text flow
uint displayMode, // draw transparent or opaque
ref LSPOINT ptRun, // [in] display position (at baseline)
ref LsHeights lsHeights, // [in] run height metrics
int runWidth, // run overall advance width
ref LSRECT clippingRect // [in] clipping rectangle if any applied
)
{
LsErr lserr = LsErr.None;
LSRun lsrun = null;
try
{
TextMetrics.FullTextLine currentLine = Draw.CurrentLine;
lsrun = currentLine.GetRun(plsrun);
Debug.Assert(TextStore.IsContent(plsrun) && lsrun.Shapeable != null);
GlyphRun glyphRun = ComputeShapedGlyphRun(
lsrun,
currentLine.Formatter,
true, // origin of the glyph run provided at drawing time
ptRun,
charCount,
pwchText,
puClusterMap,
glyphCount,
puGlyphs,
piJustifiedGlyphAdvances,
piiGlyphOffsets,
currentLine.IsJustified
);
if (glyphRun != null)
{
DrawingContext drawingContext = Draw.DrawingContext;
Draw.SetGuidelineY(glyphRun.BaselineOrigin.Y);
try
{
_boundingBox.Union(
lsrun.DrawGlyphRun(
drawingContext,
null, // draw with the run's foreground
glyphRun
)
);
}
finally
{
Draw.UnsetGuidelineY();
}
}
}
catch (Exception e)
{
SaveException(e, plsrun, lsrun);
lserr = LsErr.ClientAbort;
}
catch
{
SaveNonCLSException("DrawGlyphs", plsrun, lsrun);
lserr = LsErr.ClientAbort;
}
return lserr;
}
internal unsafe LsErr DrawTextRun(
IntPtr pols, // Line Layout context
Plsrun plsrun, // plsrun
ref LSPOINT ptText, // [in] text origin
char* pwchText, // character string
int* piCharAdvances, // char advance widths
int cchText, // text length
LsTFlow textFlow, // text flow
uint displayMode, // draw in transparent or opaque
ref LSPOINT ptRun, // [in] run origin
ref LsHeights lsHeights, // [in] run height
int dupRun, // run length
ref LSRECT clipRect // [in] from DisplayLine's clip rectangle param
)
{
LsErr lserr = LsErr.None;
LSRun lsrun = null;
try
{
TextMetrics.FullTextLine currentLine = Draw.CurrentLine;
lsrun = currentLine.GetRun(plsrun);
GlyphRun glyphRun = ComputeUnshapedGlyphRun(
lsrun,
textFlow,
currentLine.Formatter,
true, // origin of the glyph run provided at drawing time
ptText,
dupRun,
cchText,
pwchText,
piCharAdvances,
currentLine.IsJustified
);
if (glyphRun != null)
{
DrawingContext drawingContext = Draw.DrawingContext;
Draw.SetGuidelineY(glyphRun.BaselineOrigin.Y);
try
{
_boundingBox.Union(
lsrun.DrawGlyphRun(
drawingContext,
null, // draw with the run's foreground brush
glyphRun
)
);
}
finally
{
Draw.UnsetGuidelineY();
}
}
}
catch (Exception e)
{
SaveException(e, plsrun, lsrun);
lserr = LsErr.ClientAbort;
}
catch
{
SaveNonCLSException("DrawTextRun", plsrun, lsrun);
lserr = LsErr.ClientAbort;
}
return lserr;
}
internal LsErr DrawUnderline(
IntPtr pols, // Line Layout context
Plsrun plsrun, // plsrun
uint ulType, // kind of underline
ref LSPOINT ptOrigin, // [in] drawing origin
int ulLength, // underline length
int ulThickness, // underline thickness
LsTFlow textFlow, // text flow direction
uint displayMode, // display mode
ref LSRECT clipRect // [in] clipping rectangle
)
{
LsErr lserr = LsErr.None;
LSRun lsrun = null;
try
{
if (!TextStore.IsContent(plsrun))
{
return LsErr.None;
}
lsrun = Draw.CurrentLine.GetRun(plsrun);
const uint locationMask = (1U << (int)TextDecorationLocation.Underline);
DrawTextDecorations(
lsrun,
locationMask,
ptOrigin.x, // left
ptOrigin.y, // underline top from LS
0, // overline top; not used
0, // strikethrough top; not used
0, // baseline top; not used
ulLength,
ulThickness,
textFlow
);
}
catch (Exception e)
{
SaveException(e, plsrun, lsrun);
lserr = LsErr.ClientAbort;
}
catch
{
SaveNonCLSException("DrawUnderline", plsrun, lsrun);
lserr = LsErr.ClientAbort;
}
return lserr;
}
internal LsErr DrawStrikethrough(
IntPtr pols, // Line Layout context
Plsrun plsrun, // plsrun
uint stType, // kind of strike
ref LSPOINT ptOrigin, // [in] drawing origin
int stLength, // strike length
int stThickness, // strike thickness
LsTFlow textFlow, // text flow direction
uint displayMode, // display mode
ref LSRECT clipRect // [in] clipping rectangle
)
{
LsErr lserr = LsErr.None;
LSRun lsrun = null;
try
{
if (!TextStore.IsContent(plsrun))
{
return LsErr.None;
}
TextMetrics.FullTextLine currentLine = Draw.CurrentLine;
lsrun = currentLine.GetRun(plsrun);
double strikeThroughPositionInEm;
double strikeThroughThicknessInEm;
GetLSRunStrikethroughMetrics(lsrun, out strikeThroughPositionInEm, out strikeThroughThicknessInEm);
int baselineTop = ptOrigin.y + (int)Math.Round(lsrun.EmSize * strikeThroughPositionInEm);
int overlineTop = baselineTop - (lsrun.BaselineOffset - (int)Math.Round(lsrun.EmSize * strikeThroughThicknessInEm));
const uint locationMask =
(1U << (int)TextDecorationLocation.OverLine) |
(1U << (int)TextDecorationLocation.Strikethrough) |
(1U << (int)TextDecorationLocation.Baseline);
DrawTextDecorations(
lsrun,
locationMask,
ptOrigin.x, // left
0, // underline top; not used
overlineTop,
ptOrigin.y, // strikethrough top from LS
baselineTop,
stLength,
stThickness,
textFlow
);
}
catch (Exception e)
{
SaveException(e, plsrun, lsrun);
lserr = LsErr.ClientAbort;
}
catch
{
SaveNonCLSException("DrawStrikethrough", plsrun, lsrun);
lserr = LsErr.ClientAbort;
}
return lserr;
}
internal static extern LsErr LoDisplayLine(
IntPtr ploline,
ref LSPOINT pt,
uint displayMode,
ref LSRECT clipRect
);
