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Stitching function unit tests

This commit is contained in:
Jakub Melka 2019-03-10 10:54:04 +01:00
parent 234b7c77f7
commit 214af0629d
3 changed files with 204 additions and 3 deletions
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83
PdfForQtLib/sources/pdffunction.cpp
View File

@ -229,6 +229,74 @@ PDFFunctionPtr PDFFunction::createFunctionImpl(const PDFDocument* document, cons
case 3:
{
// Stitching function
std::vector<PDFReal> bounds = loader.readNumberArrayFromDictionary(dictionary, "Bounds");
std::vector<PDFReal> encode = loader.readNumberArrayFromDictionary(dictionary, "Encode");
if (domain.size() != 2)
{
throw PDFParserException(PDFParsingContext::tr("Stitching function can have only one input value."));
}
if (dictionary->hasKey("Functions"))
{
const PDFObject& functions = document->getObject(dictionary->get("Functions"));
if (functions.isArray())
{
const PDFArray* array = functions.getArray();
if (array->getCount() != bounds.size() + 1)
{
throw PDFParserException(PDFParsingContext::tr("Stitching function has different function count. Expected %1, actual %2.").arg(array->getCount()).arg(bounds.size() + 1));
}
std::vector<PDFStitchingFunction::PartialFunction> partialFunctions;
partialFunctions.resize(array->getCount());
if (encode.size() != partialFunctions.size() * 2)
{
throw PDFParserException(PDFParsingContext::tr("Stitching function has invalid encode array. Expected %1 items, actual %2.").arg(partialFunctions.size() * 2).arg(encode.size()));
}
std::vector<PDFReal> boundsAdjusted;
boundsAdjusted.resize(bounds.size() + 2);
boundsAdjusted.front() = domain.front();
boundsAdjusted.back() = domain.back();
std::copy(bounds.cbegin(), bounds.cend(), std::next(boundsAdjusted.begin()));
Q_ASSERT(boundsAdjusted.size() == partialFunctions.size() + 1);
uint32_t n = 0;
for (size_t i = 0; i < partialFunctions.size(); ++i)
{
PDFStitchingFunction::PartialFunction& partialFunction = partialFunctions[i];
partialFunction.function = createFunctionImpl(document, array->getItem(i), context);
partialFunction.bound0 = boundsAdjusted[i];
partialFunction.bound1 = boundsAdjusted[i + 1];
partialFunction.encode0 = encode[2 * i];
partialFunction.encode1 = encode[2 * i + 1];
const uint32_t nLocal = partialFunction.function->getOutputVariableCount();
if (n == 0)
{
n = nLocal;
}
else if (n != nLocal)
{
throw PDFParserException(PDFParsingContext::tr("Functions in stitching function has different number of output variables."));
}
}
return std::make_shared<PDFStitchingFunction>(1, n, std::move(domain), std::move(range), std::move(partialFunctions));
}
else
{
throw PDFParserException(PDFParsingContext::tr("Stitching function has invalid functions."));
}
}
else
{
throw PDFParserException(PDFParsingContext::tr("Stitching function hasn't functions array."));
}
}
case 4:
{
@ -476,6 +544,21 @@ PDFFunction::FunctionResult PDFExponentialFunction::apply(PDFFunction::const_ite
return true;
}
PDFStitchingFunction::PDFStitchingFunction(uint32_t m, uint32_t n,
std::vector<PDFReal>&& domain,
std::vector<PDFReal>&& range,
std::vector<PDFStitchingFunction::PartialFunction>&& partialFunctions) :
PDFFunction(m, n, std::move(domain), std::move(range)),
m_partialFunctions(std::move(partialFunctions))
{
Q_ASSERT(m == 1);
}
PDFStitchingFunction::~PDFStitchingFunction()
{
}
PDFFunction::FunctionResult PDFStitchingFunction::apply(const_iterator x_1,
const_iterator x_m,
iterator y_1,

12
PdfForQtLib/sources/pdffunction.h
View File

@ -70,6 +70,12 @@ public:
QString errorMessage;
};
/// Returns number of input variables
inline uint32_t getInputVariableCount() const { return m_m; }
/// Returns number of output variables
inline uint32_t getOutputVariableCount() const { return m_n; }
using iterator = PDFReal*;
using const_iterator = const PDFReal*;
@ -112,7 +118,7 @@ protected:
/// \param y_max End of the output interval
static inline constexpr PDFReal interpolate(PDFReal x, PDFReal x_min, PDFReal x_max, PDFReal y_min, PDFReal y_max)
{
return y_min + x * (y_max - y_min) / (x_max - x_min);
return y_min + (x - x_min) * (y_max - y_min) / (x_max - x_min);
}
/// Performs linear interpolation between c0 and c1 using x (in range [0.0, 1.0]). If x is not of this range,
@ -215,7 +221,7 @@ private:
/// is defined as f(x) = c0 + x^exponent * (c1 - c0). If exponent is 1.0, then linear interpolation
/// is performed as f(x) = c0 * (1 - x) + x * c1. To be more precise, if exponent is nearly 1.0,
/// then linear interpolation is used instead.
class PDFExponentialFunction : public PDFFunction
class PDFFORQTLIBSHARED_EXPORT PDFExponentialFunction : public PDFFunction
{
public:
/// Construct new exponential function.
@ -252,7 +258,7 @@ private:
/// Stitching function (Type 3 function)
/// This type of function has always exactly one input. Transformation of this function
/// is defined via k subfunctions which are used in defined intervals of the input value.
class PDFStitchingFunction : public PDFFunction
class PDFFORQTLIBSHARED_EXPORT PDFStitchingFunction : public PDFFunction
{
public:
struct PartialFunction

112
UnitTests/tst_lexicalanalyzertest.cpp
View File

@ -50,6 +50,7 @@ private slots:
void test_lzw_filter();
void test_sampled_function();
void test_exponential_function();
void test_stitching_function();
private:
void scanWholeStream(const char* stream);
@ -845,6 +846,117 @@ void LexicalAnalyzerTest::test_exponential_function()
}, pdf::PDFParserException);
}
void LexicalAnalyzerTest::test_stitching_function()
{
{
QByteArray data = " << "
" /FunctionType 3 "
" /Domain [ 0 1 ] "
" /Bounds [ 0.5 ] "
" /Encode [ 0 0.5 0.5 1.0 ] "
" /Functions [ /Identity << /FunctionType 2 /Domain [ 0.5 1.0 ] /N 2.0 >> ] "
" >> ";
pdf::PDFDocument document;
pdf::PDFParser parser(data, nullptr, pdf::PDFParser::None);
pdf::PDFFunctionPtr function = pdf::PDFFunction::createFunction(&document, parser.getObject());
QVERIFY(function);
for (double value = -1.0; value <= 3.0; value += 0.01)
{
const double clampedValue = qBound(0.0, value, 1.0);
const double expected = clampedValue < 0.5 ? clampedValue : clampedValue * clampedValue;
double actual = 0.0;
QVERIFY(function->apply(&value, &value + 1, &actual, &actual + 1));
QVERIFY(qFuzzyCompare(expected, actual));
}
}
QVERIFY_EXCEPTION_THROWN(
{
QByteArray data = " << "
" /FunctionType 3 "
" /Domain [ 0 1 ] "
" /Bounds [ 0.5 ] "
" /Encode [ 0 0.5 0.5 ] "
" /Functions [ /Identity << /FunctionType 2 /Domain [ 0.5 1.0 ] /N 2.0 >> ] "
" >> ";
pdf::PDFDocument document;
pdf::PDFParser parser(data, nullptr, pdf::PDFParser::None);
pdf::PDFFunctionPtr function = pdf::PDFFunction::createFunction(&document, parser.getObject());
QVERIFY(!function);
}, pdf::PDFParserException);
QVERIFY_EXCEPTION_THROWN(
{
QByteArray data = " << "
" /FunctionType 3 "
" /Domain [ 0 ] "
" /Bounds [ 0.5 ] "
" /Encode [ 0 0.5 0.5 1.0 ] "
" /Functions [ /Identity << /FunctionType 2 /Domain [ 0.5 1.0 ] /N 2.0 >> ] "
" >> ";
pdf::PDFDocument document;
pdf::PDFParser parser(data, nullptr, pdf::PDFParser::None);
pdf::PDFFunctionPtr function = pdf::PDFFunction::createFunction(&document, parser.getObject());
QVERIFY(!function);
}, pdf::PDFParserException);
QVERIFY_EXCEPTION_THROWN(
{
QByteArray data = " << "
" /FunctionType 3 "
" /Domain [ 0 1 ] "
" /Bounds [ 0.5 0.5 ] "
" /Encode [ 0 0.5 0.5 1.0 ] "
" /Functions [ /Identity << /FunctionType 2 /Domain [ 0.5 1.0 ] /N 2.0 >> ] "
" >> ";
pdf::PDFDocument document;
pdf::PDFParser parser(data, nullptr, pdf::PDFParser::None);
pdf::PDFFunctionPtr function = pdf::PDFFunction::createFunction(&document, parser.getObject());
QVERIFY(!function);
}, pdf::PDFParserException);
QVERIFY_EXCEPTION_THROWN(
{
QByteArray data = " << "
" /FunctionType 3 "
" /Domain [ 0 1 ] "
" /Encode [ 0 0.5 0.5 1.0 ] "
" /Functions [ /Identity << /FunctionType 2 /Domain [ 0.5 1.0 ] /N 2.0 >> ] "
" >> ";
pdf::PDFDocument document;
pdf::PDFParser parser(data, nullptr, pdf::PDFParser::None);
pdf::PDFFunctionPtr function = pdf::PDFFunction::createFunction(&document, parser.getObject());
QVERIFY(!function);
}, pdf::PDFParserException);
QVERIFY_EXCEPTION_THROWN(
{
QByteArray data = " << "
" /FunctionType 3 "
" /Domain [ 0 1 ] "
" /Bounds [ 0.5 ] "
" /Functions [ /Identity << /FunctionType 2 /Domain [ 0.5 1.0 ] /N 2.0 >> ] "
" >> ";
pdf::PDFDocument document;
pdf::PDFParser parser(data, nullptr, pdf::PDFParser::None);
pdf::PDFFunctionPtr function = pdf::PDFFunction::createFunction(&document, parser.getObject());
QVERIFY(!function);
}, pdf::PDFParserException);
}
void LexicalAnalyzerTest::scanWholeStream(const char* stream)
{
pdf::PDFLexicalAnalyzer analyzer(stream, stream + strlen(stream));