fenix/PDF4QT
1
0
Fork 0
mirror of https://github.com/JakubMelka/PDF4QT.git synced 2025-06-05 21:59:17 +02:00
Code Issues Packages Projects Releases Wiki Activity

Free form gourad triangle shading

Browse Source
This commit is contained in:
Jakub Melka
2019-09-15 16:50:34 +02:00
parent 40290fd2ec
commit dc6bc3e96c
7 changed files with 433 additions and 23 deletions
Download Patch File Download Diff File Expand all files Collapse all files

30
PdfForQtLib/sources/pdfutils.cpp
View File

@ -21,8 +21,9 @@
namespace pdf
{
PDFBitReader::PDFBitReader(QDataStream* stream, Value bitsPerComponent) :
PDFBitReader::PDFBitReader(const QByteArray* stream, Value bitsPerComponent) :
m_stream(stream),
m_position(0),
m_bitsPerComponent(bitsPerComponent),
m_maximalValue((static_cast<Value>(1) << m_bitsPerComponent) - static_cast<Value>(1)),
m_buffer(0),
@ -33,33 +34,33 @@ PDFBitReader::PDFBitReader(QDataStream* stream, Value bitsPerComponent) :
Q_ASSERT(bitsPerComponent < 56);
}
PDFBitReader::Value PDFBitReader::read()
PDFBitReader::Value PDFBitReader::read(PDFBitReader::Value bits)
{
while (m_bitsInBuffer < m_bitsPerComponent)
while (m_bitsInBuffer < bits)
{
if (!m_stream->atEnd())
if (m_position < m_stream->size())
{
uint8_t currentByte = 0;
(*m_stream) >> currentByte;
uint8_t currentByte = static_cast<uint8_t>((*m_stream)[m_position++]);
m_buffer = (m_buffer << 8) | currentByte;
m_bitsInBuffer += 8;
}
else
{
throw PDFParserException(PDFTranslationContext::tr("Not enough data to read %1-bit value.").arg(m_bitsPerComponent));
throw PDFParserException(PDFTranslationContext::tr("Not enough data to read %1-bit value.").arg(bits));
}
}
// Now we have enough bits to read the data
Value value = (m_buffer >> (m_bitsInBuffer - m_bitsPerComponent)) & m_maximalValue;
m_bitsInBuffer -= m_bitsPerComponent;
Value value = (m_buffer >> (m_bitsInBuffer - bits)) & ((static_cast<Value>(1) << bits) - static_cast<Value>(1));
m_bitsInBuffer -= bits;
return value;
}
void PDFBitReader::seek(qint64 position)
{
if (m_stream->device()->seek(position))
if (position < m_stream->size())
{
m_position = position;
m_buffer = 0;
m_bitsInBuffer = 0;
}
@ -69,4 +70,13 @@ void PDFBitReader::seek(qint64 position)
}
}
void PDFBitReader::alignToBytes()
{
const Value remainder = m_bitsInBuffer % 8;
if (remainder > 0)
{
read(remainder);
}
}
} // namespace pdf