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Redacting tool

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Jakub Melka
2020-12-29 18:33:25 +01:00
parent 0c6903d5b8
commit 59721d7de8
18 changed files with 735 additions and 4 deletions
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92
Pdf4QtLib/sources/pdfpainter.cpp
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@ -611,6 +611,98 @@ void PDFPrecompiledPage::draw(QPainter* painter, const QRectF& cropBox, const QM
painter->restore();
}
void PDFPrecompiledPage::redact(QPainterPath redactPath, const QMatrix& matrix, QColor color)
{
if (redactPath.isEmpty())
{
// Nothing to be redacted
return;
}
std::stack<QMatrix> worldMatrixStack;
worldMatrixStack.push(matrix);
if (color.isValid())
{
m_instructions.insert(m_instructions.begin(), Instruction(InstructionType::SaveGraphicState, 0));
}
// Process all instructions
for (const Instruction& instruction : m_instructions)
{
switch (instruction.type)
{
case InstructionType::DrawPath:
{
QMatrix matrix = worldMatrixStack.top().inverted();
QPainterPath mappedRedactPath = matrix.map(redactPath);
PathPaintData& path = m_paths[instruction.dataIndex];
path.path = path.path.subtracted(mappedRedactPath);
break;
}
case InstructionType::DrawImage:
{
ImageData& data = m_images[instruction.dataIndex];
QImage& image = data.image;
QMatrix imageTransform(1.0 / image.width(), 0, 0, 1.0 / image.height(), 0, 0);
QMatrix worldMatrix = imageTransform * worldMatrixStack.top();
// Jakub Melka: Because Qt uses opposite axis direction than PDF, then we must transform the y-axis
// to the opposite (so the image is then unchanged)
worldMatrix.translate(0, image.height());
worldMatrix.scale(1, -1);
QPainter painter(&image);
painter.setWorldMatrix(worldMatrix.inverted());
painter.drawPath(redactPath);
painter.end();
break;
}
case InstructionType::DrawMesh:
// We do not redact mesh
break;
case InstructionType::Clip:
{
QMatrix matrix = worldMatrixStack.top().inverted();
QPainterPath mappedRedactPath = matrix.map(redactPath);
m_clips[instruction.dataIndex].clipPath = m_clips[instruction.dataIndex].clipPath.subtracted(mappedRedactPath);
break;
}
case InstructionType::SaveGraphicState:
worldMatrixStack.push(worldMatrixStack.top());
break;
case InstructionType::RestoreGraphicState:
worldMatrixStack.pop();
break;
case InstructionType::SetWorldMatrix:
worldMatrixStack.top() = m_matrices[instruction.dataIndex];
break;
case InstructionType::SetCompositionMode:
break;
default:
{
Q_ASSERT(false);
break;
}
}
}
if (color.isValid())
{
addRestoreGraphicState();
addPath(Qt::NoPen, QBrush(color), matrix.map(redactPath), false);
}
}
void PDFPrecompiledPage::addPath(QPen pen, QBrush brush, QPainterPath path, bool isText)
{
m_instructions.emplace_back(InstructionType::DrawPath, m_paths.size());