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Bugfixing, unit tests for PostScript engine

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This commit is contained in:
Jakub Melka
2019-03-17 14:08:30 +01:00
parent 60dbd0c65f
commit 2964637949
2 changed files with 33 additions and 3 deletions
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13
PdfForQtLib/sources/pdffunction.cpp
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@ -1523,9 +1523,16 @@ void PDFPostScriptFunctionStack::index(PDFInteger n)
void PDFPostScriptFunctionStack::roll(PDFInteger n, PDFInteger j)
{
if (n == 0 || j == 0)
if (n == 0)
{
// If n is zero, then we are rolling zero arguments - do nothing
return;
}
// If we roll n-times, then we get original sequence
j = j % n;
if (j == 0)
{
// If j is zero, then we don't roll anything at all - do nothing
return;
}
@ -1543,12 +1550,12 @@ void PDFPostScriptFunctionStack::roll(PDFInteger n, PDFInteger j)
if (j > 0)
{
// Rotate left j times
std::rotate(operands.begin(), operands.begin() + j, operands.end());
std::rotate(operands.begin(), operands.end() - j, operands.end());
}
else
{
// Rotate right j times
std::rotate(operands.rbegin(), operands.rbegin() - j, operands.rend());
std::rotate(operands.rbegin(), operands.rend() + j, operands.rend());
}
// Load data back from temporary array