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LibPDF: Add scaffolding for function objects

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See PDF 1.7 Spec, "3.9 Functions".
This commit is contained in:
Nico Weber 2023-11-03 06:18:37 -04:00 • committed by Andreas Kling
parent 21894f1cde
commit 9204252d02
3 changed files with 80 additions and 0 deletions
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1
Userland/Libraries/LibPDF/CMakeLists.txt
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@ -14,6 +14,7 @@ set(SOURCES
Fonts/Type0Font.cpp
Fonts/Type1Font.cpp
Fonts/Type1FontProgram.cpp
Function.cpp
Interpolation.cpp
ObjectDerivatives.cpp
Page.cpp

58
Userland/Libraries/LibPDF/Function.cpp Normal file
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@ -0,0 +1,58 @@
/*
* Copyright (c) 2023, Nico Weber <thakis@chromium.org>
*
* SPDX-License-Identifier: BSD-2-Clause
*/
#include <LibPDF/Function.h>
// PDF 1.7 spec, 3.9 Functions
namespace PDF {
class SampledFunction final : public Function {
public:
virtual PDFErrorOr<ReadonlySpan<float>> evaluate(ReadonlySpan<float>) const override;
};
PDFErrorOr<ReadonlySpan<float>> SampledFunction::evaluate(ReadonlySpan<float>) const
{
return Error(Error::Type::RenderingUnsupported, "SampledFunction not yet implemented"_string);
}
class ExponentialInterpolationFunction final : public Function {
public:
virtual PDFErrorOr<ReadonlySpan<float>> evaluate(ReadonlySpan<float>) const override;
};
PDFErrorOr<ReadonlySpan<float>> ExponentialInterpolationFunction::evaluate(ReadonlySpan<float>) const
{
return Error(Error::Type::RenderingUnsupported, "ExponentialInterpolationFunction not yet implemented"_string);
}
class StitchingFunction final : public Function {
public:
virtual PDFErrorOr<ReadonlySpan<float>> evaluate(ReadonlySpan<float>) const override;
};
PDFErrorOr<ReadonlySpan<float>> StitchingFunction::evaluate(ReadonlySpan<float>) const
{
return Error(Error::Type::RenderingUnsupported, "StitchingFunction not yet implemented"_string);
}
class PostScriptCalculatorFunction final : public Function {
public:
virtual PDFErrorOr<ReadonlySpan<float>> evaluate(ReadonlySpan<float>) const override;
};
PDFErrorOr<ReadonlySpan<float>> PostScriptCalculatorFunction::evaluate(ReadonlySpan<float>) const
{
return Error(Error::Type::RenderingUnsupported, "PostScriptCalculatorFunction not yet implemented"_string);
}
PDFErrorOr<NonnullRefPtr<Function>> Function::create(Document*, NonnullRefPtr<Object>)
{
return Error(Error::Type::RenderingUnsupported, "Function creation not yet implemented"_string);
}
}

21
Userland/Libraries/LibPDF/Function.h Normal file
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@ -0,0 +1,21 @@
/*
* Copyright (c) 2023, Nico Weber <thakis@chromium.org>
*
* SPDX-License-Identifier: BSD-2-Clause
*/
#pragma once
#include <AK/Forward.h>
#include <LibPDF/Value.h>
namespace PDF {
class Function : public RefCounted<Function> {
public:
static PDFErrorOr<NonnullRefPtr<Function>> create(Document*, NonnullRefPtr<Object>);
virtual ~Function() = default;
virtual PDFErrorOr<ReadonlySpan<float>> evaluate(ReadonlySpan<float>) const = 0;
};
}