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LibPDF: Implement SeparationColorSpace
Requires PDF::Function, which isn't implemented yet, so this has no visual effect yet.
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3 changed files with 68 additions and 8 deletions
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@ -688,16 +688,70 @@ Vector<float> IndexedColorSpace::default_decode() const
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return { 0.0, static_cast<float>(m_hival) };
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}
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PDFErrorOr<NonnullRefPtr<SeparationColorSpace>> SeparationColorSpace::create(Document*, Vector<Value>&&)
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PDFErrorOr<NonnullRefPtr<SeparationColorSpace>> SeparationColorSpace::create(Document* document, Vector<Value>&& parameters)
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{
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auto color_space = adopt_ref(*new SeparationColorSpace());
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// FIXME: Implement.
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if (parameters.size() != 3)
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return Error { Error::Type::MalformedPDF, "Separation color space expected three parameters" };
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// "The name parameter is a name object specifying the name of the colorant that this Separation color space
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// is intended to represent (or one of the special names All or None; see below)"
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auto param0 = TRY(document->resolve(parameters[0]));
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if (!param0.has<NonnullRefPtr<Object>>())
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return Error { Error::Type::MalformedPDF, "Separation color space expects object for first arg" };
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auto name_object = param0.get<NonnullRefPtr<Object>>();
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if (!name_object->is<NameObject>())
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return Error { Error::Type::MalformedPDF, "Separation color space expects name object for first arg" };
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auto name = name_object->cast<NameObject>()->name();
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// "The alternateSpace parameter must be an array or name object that identifies the alternate color space,
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// which can be any device or CIE-based color space but not another special color space
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// (Pattern, Indexed, Separation, or DeviceN)."
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auto param1 = TRY(document->resolve(parameters[1]));
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if (!param1.has<NonnullRefPtr<Object>>())
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return Error { Error::Type::MalformedPDF, "Separation color space expects object for second arg" };
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auto alternate_space_object = param1.get<NonnullRefPtr<Object>>();
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auto alternate_space = TRY(ColorSpace::create(document, alternate_space_object));
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auto family = alternate_space->family();
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if (family.name() == ColorSpaceFamily::Pattern.name() || family.name() == ColorSpaceFamily::Indexed.name() || family.name() == ColorSpaceFamily::Separation.name() || family.name() == ColorSpaceFamily::DeviceN.name())
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return Error { Error::Type::MalformedPDF, "Separation color space has invalid alternate color space" };
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// "The tintTransform parameter must be a function"
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auto param2 = TRY(document->resolve(parameters[2]));
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if (!param2.has<NonnullRefPtr<Object>>())
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return Error { Error::Type::MalformedPDF, "Separation color space expects object for third arg" };
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auto tint_transform_object = param2.get<NonnullRefPtr<Object>>();
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auto tint_transform = TRY(Function::create(document, tint_transform_object));
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auto color_space = adopt_ref(*new SeparationColorSpace(move(alternate_space), move(tint_transform)));
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color_space->m_name = move(name);
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return color_space;
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}
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PDFErrorOr<Color> SeparationColorSpace::color(ReadonlySpan<Value>) const
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SeparationColorSpace::SeparationColorSpace(NonnullRefPtr<ColorSpace> alternate_space, NonnullRefPtr<Function> tint_transform)
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: m_alternate_space(move(alternate_space))
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, m_tint_transform(move(tint_transform))
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{
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return Error::rendering_unsupported_error("Separation color spaces not yet implemented");
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}
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PDFErrorOr<Color> SeparationColorSpace::color(ReadonlySpan<Value> arguments) const
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{
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// "For an additive device such as a computer display, a Separation color space never applies a process colorant directly;
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// it always reverts to the alternate color space as described below."
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// "During subsequent painting operations, an application calls [the tint] function to transform a tint value into
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// color component values in the alternate color space."
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// FIXME: Does this need handling for the special colorant names "All" and "None"?
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// FIXME: When drawing to a printer, do something else.
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VERIFY(arguments.size() == 1);
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auto a = arguments[0].to_float();
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auto tint_output = TRY(m_tint_transform->evaluate(ReadonlySpan<float> { &a, 1 }));
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m_tint_output_values.resize(tint_output.size());
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for (size_t i = 0; i < tint_output.size(); ++i)
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m_tint_output_values[i] = tint_output[i];
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return m_alternate_space->color(m_tint_output_values);
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}
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Vector<float> SeparationColorSpace::default_decode() const
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