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Merge pull request #570 from UglyToad/alpha-operator

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AlphaConstants and more named graphics state
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BobLd 2023-03-19 20:52:13 +00:00 committed by GitHub
commit c024e6abd0
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2 changed files with 67 additions and 2 deletions
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59
src/UglyToad.PdfPig/Graphics/ContentStreamProcessor.cs
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@ -789,6 +789,65 @@
currentGraphicsState.FontState.FontSize = (double)sizeToken.Data;
activeExtendedGraphicsStateFont = resourceStore.GetFontDirectly(fontReference);
}
if (state.TryGet(NameToken.Ais, pdfScanner, out BooleanToken aisToken))
{
// The alpha source flag (“alpha is shape”), specifying
// whether the current soft mask and alpha constant are to be interpreted as
// shape values (true) or opacity values (false).
currentGraphicsState.AlphaSource = aisToken.Data;
}
if (state.TryGet(NameToken.Ca, pdfScanner, out NumericToken caToken))
{
// (Optional; PDF 1.4) The current stroking alpha constant, specifying the constant
// shape or constant opacity value to be used for stroking operations in the
// transparent imaging model (see “Source Shape and Opacity” on page 526 and
// “Constant Shape and Opacity” on page 551).
currentGraphicsState.AlphaConstantStroking = caToken.Data;
}
if (state.TryGet(NameToken.CaNs, pdfScanner, out NumericToken cansToken))
{
// (Optional; PDF 1.4) The current stroking alpha constant, specifying the constant
// shape or constant opacity value to be used for NON-stroking operations in the
// transparent imaging model (see “Source Shape and Opacity” on page 526 and
// “Constant Shape and Opacity” on page 551).
currentGraphicsState.AlphaConstantNonStroking = cansToken.Data;
}
if (state.TryGet(NameToken.Op, pdfScanner, out BooleanToken OPToken))
{
// (Optional) A flag specifying whether to apply overprint (see Section 4.5.6,
// “Overprint Control”). In PDF 1.2 and earlier, there is a single overprint
// parameter that applies to all painting operations. Beginning with PDF 1.3,
// there are two separate overprint parameters: one for stroking and one for all
// other painting operations. Specifying an OP entry sets both parameters unless there
// is also an op entry in the same graphics state parameter dictionary,
// in which case the OP entry sets only the overprint parameter for stroking.
currentGraphicsState.Overprint = OPToken.Data;
}
if (state.TryGet(NameToken.OpNs, pdfScanner, out BooleanToken opToken))
{
// (Optional; PDF 1.3) A flag specifying whether to apply overprint (see Section
// 4.5.6, “Overprint Control”) for painting operations other than stroking. If
// this entry is absent, the OP entry, if any, sets this parameter.
currentGraphicsState.NonStrokingOverprint = opToken.Data;
}
if (state.TryGet(NameToken.Opm, pdfScanner, out NumericToken opmToken))
{
// (Optional; PDF 1.3) The overprint mode (see Section 4.5.6, “Overprint Control”).
currentGraphicsState.OverprintMode = opmToken.Data;
}
if (state.TryGet(NameToken.Sa, pdfScanner, out BooleanToken saToken))
{
// (Optional) A flag specifying whether to apply automatic stroke adjustment
// (see Section 6.5.4, “Automatic Stroke Adjustment”).
currentGraphicsState.StrokeAdjustment = saToken.Data;
}
}
public void BeginInlineImage()

10
src/UglyToad.PdfPig/Graphics/CurrentGraphicsState.cs
View File

@ -61,7 +61,12 @@ namespace UglyToad.PdfPig.Graphics
/// <summary>
/// Opacity value to be used for transparent imaging.
/// </summary>
public decimal AlphaConstant { get; set; } = 1;
public decimal AlphaConstantStroking { get; set; } = 1;
/// <summary>
/// Opacity value to be used for transparent imaging.
/// </summary>
public decimal AlphaConstantNonStroking { get; set; } = 1;
/// <summary>
/// Should soft mask and alpha constant values be interpreted as shape (<see langword="true"/>) or opacity (<see langword="false"/>) values?
@ -129,7 +134,8 @@ namespace UglyToad.PdfPig.Graphics
CapStyle = CapStyle,
MiterLimit = MiterLimit,
Flatness = Flatness,
AlphaConstant = AlphaConstant,
AlphaConstantStroking = AlphaConstantStroking,
AlphaConstantNonStroking = AlphaConstantNonStroking,
AlphaSource = AlphaSource,
NonStrokingOverprint = NonStrokingOverprint,
OverprintMode = OverprintMode,