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LibPDF: Implement PostScriptCalculatorFunction
Includes a tokenizer and interpreter for the subset of PostScript supported in PDF type 4 functions.
This commit is contained in:
Nico Weber
Andreas Kling
parent
bda162fc0d
commit
80eec1e16b
Notes:
sideshowbarker
2024-07-17 10:54:57 +09:00
Author: https://github.com/nico Commit: https://github.com/SerenityOS/serenity/commit/80eec1e16b Pull-request: https://github.com/SerenityOS/serenity/pull/21853 Reviewed-by: https://github.com/InusualZ
@ -7,7 +7,9 @@
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#include <AK/DeprecatedString.h>
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#include <AK/Forward.h>
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#include <LibCore/MappedFile.h>
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#include <LibPDF/CommonNames.h>
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#include <LibPDF/Document.h>
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#include <LibPDF/Function.h>
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#include <LibTest/Macros.h>
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#include <LibTest/TestCase.h>
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@ -86,3 +88,108 @@ TEST_CASE(malformed_pdf_document)
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EXPECT(document_or_error.is_error());
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}
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}
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static PDF::Value make_array(Vector<float> floats)
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{
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Vector<PDF::Value> values;
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for (auto f : floats)
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values.append(PDF::Value { f });
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return PDF::Value { adopt_ref(*new PDF::ArrayObject(move(values))) };
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}
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static PDF::PDFErrorOr<NonnullRefPtr<PDF::Function>> make_postscript_function(StringView program, Vector<float> domain, Vector<float> range)
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{
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HashMap<DeprecatedFlyString, PDF::Value> map;
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map.set(PDF::CommonNames::FunctionType, PDF::Value { 4 });
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map.set(PDF::CommonNames::Domain, make_array(move(domain)));
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map.set(PDF::CommonNames::Range, make_array(move(range)));
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auto dict = adopt_ref(*new PDF::DictObject(move(map)));
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auto stream = adopt_ref(*new PDF::StreamObject(dict, MUST(ByteBuffer::copy(program.bytes()))));
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// document isn't used for anything, but UBSan complains about a (harmless) method call on a null object without it.
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auto file = MUST(Core::MappedFile::map("linearized.pdf"sv));
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auto document = MUST(PDF::Document::create(file->bytes()));
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return PDF::Function::create(document, stream);
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}
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static NonnullRefPtr<PDF::Function> check_postscript_function(StringView program, Vector<float> domain, Vector<float> range)
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{
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auto function = make_postscript_function(program, move(domain), move(range));
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if (function.is_error())
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FAIL(function.error().message());
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return function.value();
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}
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static void check_evaluate(StringView program, Vector<float> inputs, Vector<float> outputs)
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{
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Vector<float> domain;
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for (size_t i = 0; i < inputs.size(); ++i) {
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domain.append(-100.0f);
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domain.append(100.0f);
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}
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Vector<float> range;
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for (size_t i = 0; i < outputs.size(); ++i) {
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range.append(-100.0f);
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range.append(100.0f);
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}
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auto function = check_postscript_function(program, domain, range);
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auto result = function->evaluate(inputs);
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if (result.is_error())
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FAIL(result.error().message());
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EXPECT_EQ(result.value(), outputs);
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}
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TEST_CASE(postscript)
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{
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// Arithmetic operators
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check_evaluate("{ abs }"sv, { 0.5f }, { 0.5f });
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check_evaluate("{ add }"sv, { 0.25f, 0.5f }, { 0.75f });
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check_evaluate("{ atan }"sv, { 1.0f, 0.01f }, { AK::to_degrees(atan2f(0.01f, 1.0f)) });
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check_evaluate("{ ceiling }"sv, { 0.5f }, { 1.0f });
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check_evaluate("{ cos }"sv, { 1.0f }, { cosf(AK::to_radians(1.0f)) });
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check_evaluate("{ cvi }"sv, { 0.5f }, { 0.0f });
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check_evaluate("{ cvr }"sv, { 0.5f }, { 0.5f });
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check_evaluate("{ div }"sv, { 0.5f, 1.0f }, { 0.5f });
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check_evaluate("{ exp }"sv, { 0.0f }, { 1.0f });
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check_evaluate("{ floor }"sv, { 0.5f }, { 0.0f });
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check_evaluate("{ idiv }"sv, { 0.5f, 1.0f }, { 0.0f });
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check_evaluate("{ ln }"sv, { 10.0f }, { logf(10.0f) });
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check_evaluate("{ log }"sv, { 10.0f }, { log10f(10.0f) });
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check_evaluate("{ mod }"sv, { 0.5f, 0.25f }, { 0.0f });
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check_evaluate("{ mul }"sv, { 0.5f, 0.25f }, { 0.125f });
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check_evaluate("{ neg }"sv, { 0.5f }, { -0.5f });
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check_evaluate("{ round }"sv, { 0.5f }, { 1.0f });
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check_evaluate("{ sin }"sv, { 1.0f }, { sinf(AK::to_radians(1.0f)) });
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check_evaluate("{ sqrt }"sv, { 0.5f }, { sqrtf(0.5f) });
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check_evaluate("{ sub }"sv, { 0.5f, 0.25f }, { 0.25f });
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check_evaluate("{ truncate }"sv, { 0.5f }, { 0.0f });
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// Relational, boolean, and bitwise operators
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check_evaluate("{ and }"sv, { 0.0f, 1.0f }, { 0.0f });
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check_evaluate("{ bitshift }"sv, { 1.0f, 3.0f }, { 8.0f });
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check_evaluate("{ bitshift }"sv, { 8.0f, -2.0f }, { 2.0f });
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check_evaluate("{ eq }"sv, { 0.5f, 0.5f }, { 1.0f });
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check_evaluate("{ ge }"sv, { 0.5f, 0.5f }, { 1.0f });
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check_evaluate("{ gt }"sv, { 0.5f, 0.5f }, { 0.0f });
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check_evaluate("{ le }"sv, { 0.5f, 0.5f }, { 1.0f });
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check_evaluate("{ lt }"sv, { 0.5f, 0.5f }, { 0.0f });
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check_evaluate("{ ne }"sv, { 0.5f, 0.5f }, { 0.0f });
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check_evaluate("{ not }"sv, { 0.5f }, { 0.0f });
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check_evaluate("{ or }"sv, { 0.0f, 1.0f }, { 1.0f });
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check_evaluate("{ xor }"sv, { 0.0f, 1.0f }, { 1.0f });
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// Conditional operators
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check_evaluate("{ { 4 } if }"sv, { 1.0f }, { 4.0f });
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check_evaluate("{ { 4 } if }"sv, { 0.0f }, {});
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check_evaluate("{ { 4 } { 5 } ifelse }"sv, { 1.0f }, { 4.0f });
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check_evaluate("{ { 4 } { 5 } ifelse }"sv, { 0.0f }, { 5.0f });
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// Stack operators
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check_evaluate("{ 2 copy }"sv, { 8.0f, 0.5f, 1.0f }, { 8.0f, 0.5f, 1.0f, 0.5f, 1.0f });
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check_evaluate("{ dup }"sv, { 1.0f, 0.5f }, { 1.0f, 0.5f, 0.5f });
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check_evaluate("{ exch }"sv, { 8.0f, 1.0f, 0.5f }, { 8.0f, 0.5f, 1.0f });
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check_evaluate("{ 1 index }"sv, { 8.0f, 1.0f, 0.5f }, { 8.0f, 1.0f, 0.5f, 1.0f });
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check_evaluate("{ pop }"sv, { 8.0f, 1.0f, 0.5f }, { 8.0f, 1.0f });
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check_evaluate("{ 3 1 roll }"sv, { 0.5f, 1.0f, 2.0f }, { 2.0f, 0.5f, 1.0f });
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check_evaluate("{ 3 -1 roll }"sv, { 0.5f, 1.0f, 2.0f }, { 1.0f, 2.0f, 0.5f });
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}
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@ -4,6 +4,7 @@
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* SPDX-License-Identifier: BSD-2-Clause
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*/
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#include <AK/NonnullOwnPtr.h>
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#include <LibPDF/CommonNames.h>
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#include <LibPDF/Document.h>
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#include <LibPDF/Function.h>
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@ -131,12 +132,537 @@ PDFErrorOr<ReadonlySpan<float>> StitchingFunction::evaluate(ReadonlySpan<float>)
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class PostScriptCalculatorFunction final : public Function {
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public:
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static PDFErrorOr<NonnullRefPtr<PostScriptCalculatorFunction>> create(Vector<Bound> domain, Optional<Vector<Bound>> range, NonnullRefPtr<StreamObject>);
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virtual PDFErrorOr<ReadonlySpan<float>> evaluate(ReadonlySpan<float>) const override;
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private:
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// TABLE 3.39 Operators in type 4 functions
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enum class OperatorType {
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Operand,
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// Arithmetic operators
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Abs,
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Add,
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Atan,
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Ceiling,
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Cos,
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Cvi,
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Cvr,
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Div,
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Exp,
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Floor,
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Idiv,
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Ln,
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Log,
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Mod,
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Mul,
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Neg,
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Round,
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Sin,
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Sqrt,
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Sub,
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Truncate,
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// Relational, boolean, and bitwise operators
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And,
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Bitshift,
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Eq,
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False,
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Ge,
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Gt,
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Le,
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Lt,
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Ne,
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Not,
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Or,
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True,
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Xor,
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// Conditional operators
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If,
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IfElse,
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// Stack operators
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Copy,
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Dup,
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Exch,
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Index,
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Pop,
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Roll,
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};
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static Optional<OperatorType> parse_operator(Reader&);
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struct IfElse;
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struct Token {
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// FIXME: Could nan-box this.
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OperatorType type;
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Variant<Empty, float, int> value {};
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};
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struct IfElse {
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Vector<Token> if_true;
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Vector<Token> if_false;
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};
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static PDFErrorOr<Vector<Token>> parse_postscript_calculator_function(Reader&, Vector<NonnullOwnPtr<IfElse>>&);
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struct Stack {
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Array<float, 100> stack;
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size_t top { 0 };
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PDFErrorOr<void> push(float value)
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{
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if (top == stack.size())
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return Error { Error::Type::RenderingUnsupported, "PostScript stack overflow"_string };
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stack[top++] = value;
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return {};
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}
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PDFErrorOr<float> pop()
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{
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if (top == 0)
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return Error { Error::Type::RenderingUnsupported, "PostScript stack underflow"_string };
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return stack[--top];
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}
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};
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PDFErrorOr<void> execute(Vector<Token> const&, Stack&) const;
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Vector<Bound> m_domain;
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Vector<Bound> m_range;
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Vector<Token> m_tokens;
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Vector<NonnullOwnPtr<IfElse>> m_if_elses;
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Vector<float> mutable m_result;
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};
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PDFErrorOr<ReadonlySpan<float>> PostScriptCalculatorFunction::evaluate(ReadonlySpan<float>) const
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Optional<PostScriptCalculatorFunction::OperatorType> PostScriptCalculatorFunction::parse_operator(Reader& reader)
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{
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return Error(Error::Type::RenderingUnsupported, "PostScriptCalculatorFunction not yet implemented"_string);
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auto match_keyword = [&](char const* keyword) {
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if (reader.matches(keyword)) {
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reader.consume((int)strlen(keyword));
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return true;
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}
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return false;
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};
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if (match_keyword("abs"))
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return OperatorType::Abs;
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if (match_keyword("add"))
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return OperatorType::Add;
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if (match_keyword("atan"))
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return OperatorType::Atan;
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if (match_keyword("ceiling"))
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return OperatorType::Ceiling;
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if (match_keyword("cos"))
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return OperatorType::Cos;
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if (match_keyword("cvi"))
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return OperatorType::Cvi;
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if (match_keyword("cvr"))
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return OperatorType::Cvr;
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if (match_keyword("div"))
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return OperatorType::Div;
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if (match_keyword("exp"))
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return OperatorType::Exp;
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if (match_keyword("floor"))
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return OperatorType::Floor;
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if (match_keyword("idiv"))
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return OperatorType::Idiv;
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if (match_keyword("ln"))
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return OperatorType::Ln;
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if (match_keyword("log"))
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return OperatorType::Log;
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if (match_keyword("mod"))
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return OperatorType::Mod;
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if (match_keyword("mul"))
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return OperatorType::Mul;
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if (match_keyword("neg"))
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return OperatorType::Neg;
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if (match_keyword("round"))
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return OperatorType::Round;
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if (match_keyword("sin"))
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return OperatorType::Sin;
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if (match_keyword("sqrt"))
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return OperatorType::Sqrt;
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if (match_keyword("sub"))
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return OperatorType::Sub;
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if (match_keyword("truncate"))
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return OperatorType::Truncate;
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if (match_keyword("and"))
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return OperatorType::And;
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if (match_keyword("bitshift"))
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return OperatorType::Bitshift;
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if (match_keyword("eq"))
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return OperatorType::Eq;
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if (match_keyword("false"))
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return OperatorType::False;
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if (match_keyword("ge"))
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return OperatorType::Ge;
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if (match_keyword("gt"))
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return OperatorType::Gt;
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if (match_keyword("le"))
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return OperatorType::Le;
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if (match_keyword("lt"))
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return OperatorType::Lt;
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if (match_keyword("ne"))
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return OperatorType::Ne;
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if (match_keyword("not"))
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return OperatorType::Not;
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if (match_keyword("or"))
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return OperatorType::Or;
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if (match_keyword("true"))
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return OperatorType::True;
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if (match_keyword("xor"))
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return OperatorType::Xor;
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// If and Ifelse handled elsewhere.
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if (match_keyword("copy"))
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return OperatorType::Copy;
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if (match_keyword("dup"))
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return OperatorType::Dup;
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if (match_keyword("exch"))
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return OperatorType::Exch;
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if (match_keyword("index"))
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return OperatorType::Index;
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if (match_keyword("pop"))
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return OperatorType::Pop;
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if (match_keyword("roll"))
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return OperatorType::Roll;
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return {};
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}
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PDFErrorOr<Vector<PostScriptCalculatorFunction::Token>>
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PostScriptCalculatorFunction::parse_postscript_calculator_function(Reader& reader, Vector<NonnullOwnPtr<IfElse>>& if_elses)
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{
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// Assumes valid syntax.
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reader.consume_whitespace();
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if (!reader.consume('{'))
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return Error { Error::Type::MalformedPDF, "PostScript expected '{'" };
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Vector<PostScriptCalculatorFunction::Token> tokens;
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while (!reader.matches('}')) {
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if (reader.consume_whitespace())
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continue;
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if (reader.matches('{')) {
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auto if_true = TRY(parse_postscript_calculator_function(reader, if_elses));
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reader.consume_whitespace();
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if (reader.matches("if")) {
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reader.consume(2);
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tokens.append({ OperatorType::If, (int)if_elses.size() });
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if_elses.append(adopt_own(*new IfElse { move(if_true), {} }));
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continue;
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}
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VERIFY(reader.matches('{'));
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auto if_false = TRY(parse_postscript_calculator_function(reader, if_elses));
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reader.consume_whitespace();
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if (reader.matches("ifelse")) {
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reader.consume(6);
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tokens.append({ OperatorType::IfElse, (int)if_elses.size() });
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if_elses.append(adopt_own(*new IfElse { move(if_true), move(if_false) }));
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continue;
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}
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return Error { Error::Type::MalformedPDF, "PostScript confused parsing {}-delimited expressions"_string };
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}
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if (reader.matches_number()) {
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// FIXME: Nicer float conversion.
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char const* start = reinterpret_cast<char const*>(reader.bytes().slice(reader.offset()).data());
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char* endptr;
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float value = strtof(start, &endptr);
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reader.move_by(endptr - start);
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tokens.append({ OperatorType::Operand, value });
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continue;
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}
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if (Optional<OperatorType> op = parse_operator(reader); op.has_value()) {
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tokens.append({ op.value() });
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continue;
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}
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return Error { Error::Type::MalformedPDF, "PostScript unknown operator"_string };
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}
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VERIFY(reader.consume('}'));
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return tokens;
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}
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PDFErrorOr<NonnullRefPtr<PostScriptCalculatorFunction>>
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PostScriptCalculatorFunction::create(Vector<Bound> domain, Optional<Vector<Bound>> range, NonnullRefPtr<StreamObject> stream)
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{
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if (!range.has_value())
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return Error { Error::Type::MalformedPDF, "Function type 4 requires /Range" };
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Vector<NonnullOwnPtr<IfElse>> if_elses;
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Reader reader { stream->bytes() };
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auto tokens = TRY(parse_postscript_calculator_function(reader, if_elses));
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auto function = adopt_ref(*new PostScriptCalculatorFunction());
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function->m_domain = move(domain);
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function->m_range = move(range.value());
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function->m_tokens = move(tokens);
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function->m_if_elses = move(if_elses);
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return function;
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}
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PDFErrorOr<void> PostScriptCalculatorFunction::execute(Vector<Token> const& tokens, Stack& stack) const
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{
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for (auto const& token : tokens) {
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switch (token.type) {
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case OperatorType::Operand:
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TRY(stack.push(token.value.get<float>()));
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break;
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case OperatorType::Abs:
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TRY(stack.push(fabsf(TRY(stack.pop()))));
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break;
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case OperatorType::Add: {
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float b = TRY(stack.pop());
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float a = TRY(stack.pop());
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TRY(stack.push(a + b));
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break;
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}
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case OperatorType::Atan: {
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float b = TRY(stack.pop());
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float a = TRY(stack.pop());
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TRY(stack.push(AK::to_degrees(atan2f(b, a))));
|
||||
break;
|
||||
}
|
||||
case OperatorType::Ceiling:
|
||||
TRY(stack.push(ceilf(TRY(stack.pop()))));
|
||||
break;
|
||||
case OperatorType::Cos:
|
||||
TRY(stack.push(cosf(AK::to_radians(TRY(stack.pop())))));
|
||||
break;
|
||||
case OperatorType::Cvi:
|
||||
TRY(stack.push((int)TRY(stack.pop())));
|
||||
break;
|
||||
case OperatorType::Cvr:
|
||||
TRY(stack.push(TRY(stack.pop())));
|
||||
break;
|
||||
case OperatorType::Div: {
|
||||
float b = TRY(stack.pop());
|
||||
float a = TRY(stack.pop());
|
||||
TRY(stack.push(a / b));
|
||||
break;
|
||||
}
|
||||
case OperatorType::Exp:
|
||||
TRY(stack.push(expf(TRY(stack.pop()))));
|
||||
break;
|
||||
case OperatorType::Floor:
|
||||
TRY(stack.push(floorf(TRY(stack.pop()))));
|
||||
break;
|
||||
case OperatorType::Idiv: {
|
||||
int b = (int)TRY(stack.pop());
|
||||
int a = (int)TRY(stack.pop());
|
||||
TRY(stack.push(a / b));
|
||||
break;
|
||||
}
|
||||
case OperatorType::Ln:
|
||||
TRY(stack.push(logf(TRY(stack.pop()))));
|
||||
break;
|
||||
case OperatorType::Log:
|
||||
TRY(stack.push(log10f(TRY(stack.pop()))));
|
||||
break;
|
||||
case OperatorType::Mod: {
|
||||
float b = TRY(stack.pop());
|
||||
float a = TRY(stack.pop());
|
||||
TRY(stack.push(fmodf(a, b)));
|
||||
break;
|
||||
}
|
||||
case OperatorType::Mul: {
|
||||
float b = TRY(stack.pop());
|
||||
float a = TRY(stack.pop());
|
||||
TRY(stack.push(a * b));
|
||||
break;
|
||||
}
|
||||
case OperatorType::Neg:
|
||||
TRY(stack.push(-TRY(stack.pop())));
|
||||
break;
|
||||
case OperatorType::Round:
|
||||
TRY(stack.push(roundf(TRY(stack.pop()))));
|
||||
break;
|
||||
case OperatorType::Sin:
|
||||
TRY(stack.push(sinf(AK::to_radians(TRY(stack.pop())))));
|
||||
break;
|
||||
case OperatorType::Sqrt:
|
||||
TRY(stack.push(sqrtf(TRY(stack.pop()))));
|
||||
break;
|
||||
case OperatorType::Sub: {
|
||||
float b = TRY(stack.pop());
|
||||
float a = TRY(stack.pop());
|
||||
TRY(stack.push(a - b));
|
||||
break;
|
||||
}
|
||||
case OperatorType::Truncate:
|
||||
TRY(stack.push(truncf(TRY(stack.pop()))));
|
||||
break;
|
||||
case OperatorType::And: {
|
||||
int b = (int)TRY(stack.pop());
|
||||
int a = (int)TRY(stack.pop());
|
||||
TRY(stack.push(a & b));
|
||||
break;
|
||||
}
|
||||
case OperatorType::Bitshift: {
|
||||
int b = (int)TRY(stack.pop());
|
||||
int a = (int)TRY(stack.pop());
|
||||
if (b >= 0)
|
||||
TRY(stack.push(a << b));
|
||||
else
|
||||
TRY(stack.push(a >> -b));
|
||||
break;
|
||||
}
|
||||
case OperatorType::Eq: {
|
||||
float b = TRY(stack.pop());
|
||||
float a = TRY(stack.pop());
|
||||
TRY(stack.push(a == b ? 1.0f : 0.0f));
|
||||
break;
|
||||
}
|
||||
case OperatorType::False:
|
||||
TRY(stack.push(0.0f));
|
||||
break;
|
||||
case OperatorType::Ge: {
|
||||
float b = TRY(stack.pop());
|
||||
float a = TRY(stack.pop());
|
||||
TRY(stack.push(a >= b ? 1.0f : 0.0f));
|
||||
break;
|
||||
}
|
||||
case OperatorType::Gt: {
|
||||
float b = TRY(stack.pop());
|
||||
float a = TRY(stack.pop());
|
||||
TRY(stack.push(a > b ? 1.0f : 0.0f));
|
||||
break;
|
||||
}
|
||||
case OperatorType::Le: {
|
||||
float b = TRY(stack.pop());
|
||||
float a = TRY(stack.pop());
|
||||
TRY(stack.push(a <= b ? 1.0f : 0.0f));
|
||||
break;
|
||||
}
|
||||
case OperatorType::Lt: {
|
||||
float b = TRY(stack.pop());
|
||||
float a = TRY(stack.pop());
|
||||
TRY(stack.push(a < b ? 1.0f : 0.0f));
|
||||
break;
|
||||
}
|
||||
case OperatorType::Ne: {
|
||||
float b = TRY(stack.pop());
|
||||
float a = TRY(stack.pop());
|
||||
TRY(stack.push(a != b ? 1.0f : 0.0f));
|
||||
break;
|
||||
}
|
||||
case OperatorType::Not: {
|
||||
TRY(stack.push(TRY(stack.pop()) == 0.0f ? 1.0f : 0.0f));
|
||||
break;
|
||||
}
|
||||
case OperatorType::Or: {
|
||||
int b = (int)TRY(stack.pop());
|
||||
int a = (int)TRY(stack.pop());
|
||||
TRY(stack.push(a | b));
|
||||
break;
|
||||
}
|
||||
case OperatorType::True:
|
||||
TRY(stack.push(1.0f));
|
||||
break;
|
||||
case OperatorType::Xor: {
|
||||
int b = (int)TRY(stack.pop());
|
||||
int a = (int)TRY(stack.pop());
|
||||
TRY(stack.push(a ^ b));
|
||||
break;
|
||||
}
|
||||
case OperatorType::If: {
|
||||
auto const& if_else = m_if_elses[token.value.get<int>()];
|
||||
VERIFY(if_else->if_false.is_empty());
|
||||
if (TRY(stack.pop()) != 0.0f)
|
||||
TRY(execute(if_else->if_true, stack));
|
||||
break;
|
||||
}
|
||||
case OperatorType::IfElse: {
|
||||
auto const& if_else = m_if_elses[token.value.get<int>()];
|
||||
if (TRY(stack.pop()) != 0.0f)
|
||||
TRY(execute(if_else->if_true, stack));
|
||||
else
|
||||
TRY(execute(if_else->if_false, stack));
|
||||
break;
|
||||
}
|
||||
case OperatorType::Copy: {
|
||||
int n = (int)TRY(stack.pop());
|
||||
if (n < 0)
|
||||
return Error { Error::Type::RenderingUnsupported, "PostScript copy with negative argument"_string };
|
||||
if ((size_t)n > stack.top)
|
||||
return Error { Error::Type::RenderingUnsupported, "PostScript copy with argument larger than stack"_string };
|
||||
for (int i = 0; i < n; ++i)
|
||||
TRY(stack.push(stack.stack[stack.top - n]));
|
||||
break;
|
||||
}
|
||||
case OperatorType::Dup:
|
||||
TRY(stack.push(stack.stack[stack.top - 1]));
|
||||
break;
|
||||
case OperatorType::Exch: {
|
||||
float b = TRY(stack.pop());
|
||||
float a = TRY(stack.pop());
|
||||
TRY(stack.push(b));
|
||||
TRY(stack.push(a));
|
||||
break;
|
||||
}
|
||||
case OperatorType::Index: {
|
||||
int i = (int)TRY(stack.pop());
|
||||
if (i < 0)
|
||||
return Error { Error::Type::RenderingUnsupported, "PostScript index with negative argument"_string };
|
||||
if ((size_t)i >= stack.top)
|
||||
return Error { Error::Type::RenderingUnsupported, "PostScript index with argument larger than stack"_string };
|
||||
TRY(stack.push(stack.stack[stack.top - 1 - i]));
|
||||
break;
|
||||
}
|
||||
case OperatorType::Pop:
|
||||
TRY(stack.pop());
|
||||
break;
|
||||
case OperatorType::Roll: {
|
||||
int j = -(int)TRY(stack.pop());
|
||||
int n = (int)TRY(stack.pop());
|
||||
if (n < 0)
|
||||
return Error { Error::Type::RenderingUnsupported, "PostScript roll with negative argument"_string };
|
||||
if ((size_t)n > stack.top)
|
||||
return Error { Error::Type::RenderingUnsupported, "PostScript roll with argument larger than stack"_string };
|
||||
if (j < 0)
|
||||
j += n;
|
||||
if (j < 0)
|
||||
return Error { Error::Type::RenderingUnsupported, "PostScript roll with negative argument"_string };
|
||||
if (j > n)
|
||||
return Error { Error::Type::RenderingUnsupported, "PostScript roll with argument larger than stack"_string };
|
||||
// http://pointer-overloading.blogspot.com/2013/09/algorithms-rotating-one-dimensional.html
|
||||
auto elements = stack.stack.span().slice(stack.top - n, n);
|
||||
elements.slice(0, j).reverse();
|
||||
elements.slice(j).reverse();
|
||||
elements.reverse();
|
||||
break;
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
return {};
|
||||
}
|
||||
|
||||
PDFErrorOr<ReadonlySpan<float>> PostScriptCalculatorFunction::evaluate(ReadonlySpan<float> xs) const
|
||||
{
|
||||
if (xs.size() != m_domain.size())
|
||||
return Error { Error::Type::MalformedPDF, "Function argument size does not match domain size" };
|
||||
|
||||
Stack stack;
|
||||
for (size_t i = 0; i < xs.size(); ++i)
|
||||
TRY(stack.push(clamp(xs[i], m_domain[i].lower, m_domain[i].upper)));
|
||||
|
||||
TRY(execute(m_tokens, stack));
|
||||
|
||||
if (stack.top != m_range.size())
|
||||
return Error { Error::Type::MalformedPDF, "Postscript result size does not match range size"_string };
|
||||
|
||||
// FIXME: Does this need reversing?
|
||||
m_result.resize(stack.top);
|
||||
for (size_t i = 0; i < stack.top; ++i)
|
||||
m_result[i] = clamp(stack.stack[i], m_range[i].lower, m_range[i].upper);
|
||||
return m_result;
|
||||
}
|
||||
|
||||
PDFErrorOr<NonnullRefPtr<Function>> Function::create(Document* document, NonnullRefPtr<Object> object)
|
||||
@ -191,7 +717,9 @@ PDFErrorOr<NonnullRefPtr<Function>> Function::create(Document* document, Nonnull
|
||||
case 3:
|
||||
return adopt_ref(*new StitchingFunction());
|
||||
case 4:
|
||||
return adopt_ref(*new PostScriptCalculatorFunction());
|
||||
if (!object->is<StreamObject>())
|
||||
return Error { Error::Type::MalformedPDF, "Function type 4 requires stream object" };
|
||||
return PostScriptCalculatorFunction::create(move(domain), move(optional_range), object->cast<StreamObject>());
|
||||
default:
|
||||
dbgln("invalid function type {}", function_type);
|
||||
return Error(Error::Type::MalformedPDF, "Function has unkonwn type"_string);
|
||||
|
||||
Loading…
Reference in New Issue
Block a user