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PDF4QT/Pdf4QtLib/sources/pdfdrawspacecontroller.cpp

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// Copyright (C) 2019-2020 Jakub Melka
//
// This file is part of Pdf4Qt.
//
// Pdf4Qt is free software: you can redistribute it and/or modify
// it under the terms of the GNU Lesser General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// Pdf4Qt is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU Lesser General Public License for more details.
//
// You should have received a copy of the GNU Lesser General Public License
// along with Pdf4Qt. If not, see <https://www.gnu.org/licenses/>.
#include "pdfdrawspacecontroller.h"
#include "pdfdrawwidget.h"
#include "pdfrenderer.h"
#include "pdfpainter.h"
#include "pdfcompiler.h"
#include "pdfconstants.h"
#include "pdfcms.h"
#include "pdfannotation.h"
#include <QPainter>
#include <QFontMetrics>
namespace pdf
{
PDFDrawSpaceController::PDFDrawSpaceController(QObject* parent) :
QObject(parent),
m_document(nullptr),
m_optionalContentActivity(nullptr),
m_pageLayoutMode(PageLayout::OneColumn),
m_verticalSpacingMM(5.0),
m_horizontalSpacingMM(1.0),
m_pageRotation(PageRotation::None),
m_fontCache(DEFAULT_FONT_CACHE_LIMIT, DEFAULT_REALIZED_FONT_CACHE_LIMIT)
{
}
PDFDrawSpaceController::~PDFDrawSpaceController()
{
}
void PDFDrawSpaceController::setDocument(const PDFModifiedDocument& document)
{
if (document != m_document)
{
m_document = document;
m_fontCache.setDocument(document);
m_optionalContentActivity = document.getOptionalContentActivity();
// If document is not being reset, then recalculation is not needed,
// pages should remain the same.
if (document.hasReset())
{
recalculate();
}
}
}
void PDFDrawSpaceController::setPageLayout(PageLayout pageLayout)
{
if (m_pageLayoutMode != pageLayout)
{
m_pageLayoutMode = pageLayout;
recalculate();
}
}
QRectF PDFDrawSpaceController::getBlockBoundingRectangle(size_t blockIndex) const
{
if (blockIndex < m_blockItems.size())
{
return m_blockItems[blockIndex].blockRectMM;
}
return QRectF();
}
PDFDrawSpaceController::LayoutItems PDFDrawSpaceController::getLayoutItems(size_t blockIndex) const
{
LayoutItems result;
auto comparator = [](const LayoutItem& l, const LayoutItem& r)
{
return l.blockIndex < r.blockIndex;
};
Q_ASSERT(std::is_sorted(m_layoutItems.cbegin(), m_layoutItems.cend(), comparator));
LayoutItem templateItem;
templateItem.blockIndex = blockIndex;
auto range = std::equal_range(m_layoutItems.cbegin(), m_layoutItems.cend(), templateItem, comparator);
result.reserve(std::distance(range.first, range.second));
std::copy(range.first, range.second, std::back_inserter(result));
return result;
}
PDFDrawSpaceController::LayoutItem PDFDrawSpaceController::getLayoutItemForPage(PDFInteger pageIndex) const
{
LayoutItem result;
if (pageIndex >= 0 && pageIndex < static_cast<PDFInteger>(m_layoutItems.size()) && m_layoutItems[pageIndex].pageIndex == pageIndex)
{
result = m_layoutItems[pageIndex];
}
if (!result.isValid())
{
auto it = std::find_if(m_layoutItems.cbegin(), m_layoutItems.cend(), [pageIndex](const LayoutItem& item) { return item.pageIndex == pageIndex; });
if (it != m_layoutItems.cend())
{
result = *it;
}
}
return result;
}
QSizeF PDFDrawSpaceController::getReferenceBoundingBox() const
{
QRectF rect;
for (const LayoutItem& item : m_layoutItems)
{
QRectF pageRect = item.pageRectMM;
pageRect.translate(0, -pageRect.top());
rect = rect.united(pageRect);
}
if (rect.isValid())
{
rect.adjust(0, 0, m_horizontalSpacingMM, m_verticalSpacingMM);
}
return rect.size();
}
void PDFDrawSpaceController::setPageRotation(PageRotation pageRotation)
{
if (m_pageRotation != pageRotation)
{
m_pageRotation = pageRotation;
recalculate();
}
}
void PDFDrawSpaceController::recalculate()
{
if (!m_document)
{
clear(true);
return;
}
const PDFCatalog* catalog = m_document->getCatalog();
size_t pageCount = catalog->getPageCount();
// Clear the old draw space
clear(false);
static constexpr size_t INVALID_PAGE_INDEX = std::numeric_limits<size_t>::max();
// Places the pages on the left/right sides. Pages can be nullptr, but not both of them.
// Updates bounding rectangle.
auto placePagesLeftRight = [this, catalog](PDFInteger blockIndex, size_t leftIndex, size_t rightIndex, PDFReal& yPos, QRectF& boundingRect)
{
PDFReal yPosAdvance = 0.0;
if (leftIndex != INVALID_PAGE_INDEX)
{
QSizeF pageSize = PDFPage::getRotatedBox(catalog->getPage(leftIndex)->getRotatedMediaBoxMM(), m_pageRotation).size();
PDFReal xPos = -pageSize.width() - m_horizontalSpacingMM * 0.5;
QRectF rect(xPos, yPos, pageSize.width(), pageSize.height());
m_layoutItems.emplace_back(blockIndex, leftIndex, rect);
yPosAdvance = qMax(yPosAdvance, pageSize.height());
boundingRect = boundingRect.united(rect);
}
if (rightIndex != INVALID_PAGE_INDEX)
{
QSizeF pageSize = PDFPage::getRotatedBox(catalog->getPage(rightIndex)->getRotatedMediaBoxMM(), m_pageRotation).size();
PDFReal xPos = m_horizontalSpacingMM * 0.5;
QRectF rect(xPos, yPos, pageSize.width(), pageSize.height());
m_layoutItems.emplace_back(blockIndex, rightIndex, rect);
yPosAdvance = qMax(yPosAdvance, pageSize.height());
boundingRect = boundingRect.united(rect);
}
if (yPosAdvance > 0.0)
{
yPos += yPosAdvance + m_verticalSpacingMM;
}
};
// Generates block with pages using page indices. If generateBlocks is true, then
// for each pair of pages, single block is generated, otherwise block containing all
// pages is generated.
auto placePagesLeftRightByIndices = [this, &placePagesLeftRight](const std::vector<size_t>& indices, bool generateBlocks)
{
Q_ASSERT(indices.size() % 2 == 0);
PDFReal yPos = 0.0;
PDFInteger blockIndex = 0;
QRectF boundingRectangle;
size_t count = indices.size() / 2;
for (size_t i = 0; i < count; ++i)
{
const size_t leftPageIndex = indices[2 * i];
const size_t rightPageIndex = indices[2 * i + 1];
placePagesLeftRight(blockIndex, leftPageIndex, rightPageIndex, yPos, boundingRectangle);
if (generateBlocks)
{
m_blockItems.emplace_back(boundingRectangle);
// Clear the old data
yPos = 0.0;
++blockIndex;
boundingRectangle = QRectF();
}
}
if (!generateBlocks)
{
// Generate single block for all layed out pages
m_blockItems.emplace_back(boundingRectangle);
}
};
switch (m_pageLayoutMode)
{
case PageLayout::SinglePage:
{
// Each block contains single page
m_layoutItems.reserve(pageCount);
m_blockItems.reserve(pageCount);
// Pages can have different size, so we center them around the center.
// Block size will equal to the page size.
for (size_t i = 0; i < pageCount; ++i)
{
QSizeF pageSize = PDFPage::getRotatedBox(catalog->getPage(i)->getRotatedMediaBoxMM(), m_pageRotation).size();
QRectF rect(-pageSize.width() * 0.5, -pageSize.height() * 0.5, pageSize.width(), pageSize.height());
m_layoutItems.emplace_back(i, i, rect);
m_blockItems.emplace_back(rect);
}
break;
}
case PageLayout::OneColumn:
{
// Single block, one column
m_layoutItems.reserve(pageCount);
m_blockItems.reserve(1);
PDFReal yPos = 0.0;
QRectF boundingRectangle;
for (size_t i = 0; i < pageCount; ++i)
{
// Top of current page is at yPos.
QSizeF pageSize = PDFPage::getRotatedBox(catalog->getPage(i)->getRotatedMediaBoxMM(), m_pageRotation).size();
QRectF rect(-pageSize.width() * 0.5, yPos, pageSize.width(), pageSize.height());
m_layoutItems.emplace_back(0, i, rect);
yPos += pageSize.height() + m_verticalSpacingMM;
boundingRectangle = boundingRectangle.united(rect);
}
// Insert the single block with union of bounding rectangles
m_blockItems.emplace_back(boundingRectangle);
break;
}
case PageLayout::TwoColumnLeft:
{
// Pages with number 1, 3, 5, ... are on the left, 2, 4, 6 are on the right.
// Page indices are numbered from 0, so pages 0, 2, 4 will be on the left,
// 1, 3, 5 will be on the right.
// For purposes or paging, "left" pages will be on the left side of y axis (negative x axis),
// the "right" pages will be on the right side of y axis (positive x axis).
m_layoutItems.reserve(pageCount);
m_blockItems.reserve(1);
std::vector<size_t> pageIndices(pageCount, INVALID_PAGE_INDEX);
std::iota(pageIndices.begin(), pageIndices.end(), static_cast<size_t>(0));
if (pageIndices.size() % 2 == 1)
{
pageIndices.push_back(INVALID_PAGE_INDEX);
}
placePagesLeftRightByIndices(pageIndices, false);
break;
}
case PageLayout::TwoColumnRight:
{
// Similar to previous case, but page sequence start on the right.
m_layoutItems.reserve(pageCount);
m_blockItems.reserve(1);
std::vector<size_t> pageIndices(pageCount + 1, INVALID_PAGE_INDEX);
std::iota(std::next(pageIndices.begin()), pageIndices.end(), static_cast<size_t>(0));
if (pageIndices.size() % 2 == 1)
{
pageIndices.push_back(INVALID_PAGE_INDEX);
}
placePagesLeftRightByIndices(pageIndices, false);
break;
}
case PageLayout::TwoPagesLeft:
{
m_layoutItems.reserve(pageCount);
m_blockItems.reserve((pageCount / 2) + (pageCount % 2));
std::vector<size_t> pageIndices(pageCount, INVALID_PAGE_INDEX);
std::iota(pageIndices.begin(), pageIndices.end(), static_cast<size_t>(0));
if (pageIndices.size() % 2 == 1)
{
pageIndices.push_back(INVALID_PAGE_INDEX);
}
placePagesLeftRightByIndices(pageIndices, true);
break;
}
case PageLayout::TwoPagesRight:
{
m_layoutItems.reserve(pageCount);
m_blockItems.reserve((pageCount / 2) + (pageCount % 2));
std::vector<size_t> pageIndices(pageCount + 1, INVALID_PAGE_INDEX);
std::iota(std::next(pageIndices.begin()), pageIndices.end(), static_cast<size_t>(0));
if (pageIndices.size() % 2 == 1)
{
pageIndices.push_back(INVALID_PAGE_INDEX);
}
placePagesLeftRightByIndices(pageIndices, true);
break;
}
default:
{
Q_ASSERT(false);
break;
}
}
emit drawSpaceChanged();
}
void PDFDrawSpaceController::clear(bool emitSignal)
{
m_layoutItems.clear();
m_blockItems.clear();
if (emitSignal)
{
emit drawSpaceChanged();
}
}
PDFDrawWidgetProxy::PDFDrawWidgetProxy(QObject* parent) :
QObject(parent),
m_updateDisabled(false),
m_currentBlock(INVALID_BLOCK_INDEX),
m_pixelPerMM(PDF_DEFAULT_DPMM),
m_zoom(1.0),
m_pixelToDeviceSpaceUnit(0.0),
m_deviceSpaceUnitToPixel(0.0),
m_verticalOffset(0),
m_horizontalOffset(0),
m_controller(nullptr),
m_widget(nullptr),
m_horizontalScrollbar(nullptr),
m_verticalScrollbar(nullptr),
m_features(PDFRenderer::getDefaultFeatures()),
m_compiler(new PDFAsynchronousPageCompiler(this)),
m_textLayoutCompiler(new PDFAsynchronousTextLayoutCompiler(this)),
m_rasterizer(new PDFRasterizer(this)),
m_progress(nullptr),
m_useOpenGL(false)
{
m_controller = new PDFDrawSpaceController(this);
connect(m_controller, &PDFDrawSpaceController::drawSpaceChanged, this, &PDFDrawWidgetProxy::update);
connect(m_controller, &PDFDrawSpaceController::repaintNeeded, this, &PDFDrawWidgetProxy::repaintNeeded);
connect(m_controller, &PDFDrawSpaceController::pageImageChanged, this, &PDFDrawWidgetProxy::pageImageChanged);
connect(m_compiler, &PDFAsynchronousPageCompiler::renderingError, this, &PDFDrawWidgetProxy::renderingError);
connect(m_compiler, &PDFAsynchronousPageCompiler::pageImageChanged, this, &PDFDrawWidgetProxy::pageImageChanged);
connect(m_textLayoutCompiler, &PDFAsynchronousTextLayoutCompiler::textLayoutChanged, this, &PDFDrawWidgetProxy::onTextLayoutChanged);
}
PDFDrawWidgetProxy::~PDFDrawWidgetProxy()
{
}
void PDFDrawWidgetProxy::setDocument(const PDFModifiedDocument& document)
{
if (getDocument() != document)
{
m_compiler->stop(document.hasReset());
m_textLayoutCompiler->stop(document.hasReset());
m_controller->setDocument(document);
if (PDFOptionalContentActivity* optionalContentActivity = document.getOptionalContentActivity())
{
connect(optionalContentActivity, &PDFOptionalContentActivity::optionalContentGroupStateChanged, this, &PDFDrawWidgetProxy::onOptionalContentGroupStateChanged, Qt::UniqueConnection);
}
m_compiler->start();
m_textLayoutCompiler->start();
}
}
void PDFDrawWidgetProxy::init(PDFWidget* widget)
{
m_widget = widget;
m_horizontalScrollbar = widget->getHorizontalScrollbar();
m_verticalScrollbar = widget->getVerticalScrollbar();
connect(m_horizontalScrollbar, &QScrollBar::valueChanged, this, &PDFDrawWidgetProxy::onHorizontalScrollbarValueChanged);
connect(m_verticalScrollbar, &QScrollBar::valueChanged, this, &PDFDrawWidgetProxy::onVerticalScrollbarValueChanged);
connect(this, &PDFDrawWidgetProxy::drawSpaceChanged, this, &PDFDrawWidgetProxy::repaintNeeded);
connect(getCMSManager(), &PDFCMSManager::colorManagementSystemChanged, this, &PDFDrawWidgetProxy::onColorManagementSystemChanged);
// We must update the draw space - widget has been set
update();
}
void PDFDrawWidgetProxy::update()
{
if (m_updateDisabled)
{
return;
}
PDFBoolGuard guard(m_updateDisabled);
Q_ASSERT(m_widget);
Q_ASSERT(m_horizontalScrollbar);
Q_ASSERT(m_verticalScrollbar);
QWidget* widget = m_widget->getDrawWidget()->getWidget();
// First, we must calculate pixel per mm ratio to obtain DPMM (device pixel per mm),
// we also assume, that zoom is correctly set.
m_pixelPerMM = static_cast<PDFReal>(widget->width()) / static_cast<PDFReal>(widget->widthMM());
Q_ASSERT(m_zoom > 0.0);
Q_ASSERT(m_pixelPerMM > 0.0);
m_deviceSpaceUnitToPixel = m_pixelPerMM * m_zoom;
m_pixelToDeviceSpaceUnit = 1.0 / m_deviceSpaceUnitToPixel;
m_layout.clear();
// Switch to the first block, if we haven't selected any, otherwise fix active
// block item (select first block available).
if (m_controller->getBlockCount() > 0)
{
if (m_currentBlock == INVALID_BLOCK_INDEX)
{
m_currentBlock = 0;
}
else
{
m_currentBlock = qBound<PDFInteger>(0, m_currentBlock, m_controller->getBlockCount() - 1);
}
}
else
{
m_currentBlock = INVALID_BLOCK_INDEX;
}
// Then, create pixel size layout of the pages using the draw space controller
QRectF rectangle = m_controller->getBlockBoundingRectangle(m_currentBlock);
if (rectangle.isValid())
{
// We must have a valid block
PDFDrawSpaceController::LayoutItems items = m_controller->getLayoutItems(m_currentBlock);
m_layout.items.reserve(items.size());
for (const PDFDrawSpaceController::LayoutItem& item : items)
{
m_layout.items.emplace_back(item.pageIndex, fromDeviceSpace(item.pageRectMM).toRect());
}
m_layout.blockRect = fromDeviceSpace(rectangle).toRect();
}
QSize blockSize = m_layout.blockRect.size();
QSize widgetSize = widget->size();
// Horizontal scrollbar
const int horizontalDifference = blockSize.width() - widgetSize.width();
if (horizontalDifference > 0)
{
m_horizontalScrollbar->setVisible(true);
m_horizontalScrollbar->setMinimum(0);
m_horizontalScrollbar->setMaximum(horizontalDifference);
m_horizontalOffsetRange = Range<PDFInteger>(-horizontalDifference, 0);
m_horizontalOffset = m_horizontalOffsetRange.bound(m_horizontalOffset);
m_horizontalScrollbar->setValue(-m_horizontalOffset);
}
else
{
// We do not need the horizontal scrollbar, because block can be draw onto widget entirely.
// We set the offset to the half of available empty space.
m_horizontalScrollbar->setVisible(false);
m_horizontalOffset = -horizontalDifference / 2;
m_horizontalOffsetRange = Range<PDFInteger>(m_horizontalOffset);
}
// Vertical scrollbar - has two meanings, in block mode, it switches between blocks,
// in continuous mode, it controls the vertical offset.
if (isBlockMode())
{
size_t blockCount = m_controller->getBlockCount();
if (blockCount > 0)
{
Q_ASSERT(m_currentBlock != INVALID_BLOCK_INDEX);
m_verticalScrollbar->setVisible(blockCount > 1);
m_verticalScrollbar->setMinimum(0);
m_verticalScrollbar->setMaximum(static_cast<int>(blockCount - 1));
m_verticalScrollbar->setValue(static_cast<int>(m_currentBlock));
m_verticalScrollbar->setSingleStep(1);
m_verticalScrollbar->setPageStep(1);
}
else
{
Q_ASSERT(m_currentBlock == INVALID_BLOCK_INDEX);
m_verticalScrollbar->setVisible(false);
}
// We must fix case, when we can display everything on the widget (we have
// enough space). Then we will center the page on the widget.
const int verticalDifference = blockSize.height() - widgetSize.height();
if (verticalDifference < 0)
{
m_verticalOffset = -verticalDifference / 2;
m_verticalOffsetRange = Range<PDFInteger>(m_verticalOffset);
}
else
{
m_verticalOffsetRange = Range<PDFInteger>(-verticalDifference, 0);
m_verticalOffset = m_verticalOffsetRange.bound(m_verticalOffset);
}
}
else
{
const int verticalDifference = blockSize.height() - widgetSize.height();
if (verticalDifference > 0)
{
m_verticalScrollbar->setVisible(true);
m_verticalScrollbar->setMinimum(0);
m_verticalScrollbar->setMaximum(verticalDifference);
// We must also calculate single step/page step. Because pages can have different size,
// we use first page to compute page step.
if (!m_layout.items.empty())
{
const LayoutItem& item = m_layout.items.front();
const int pageStep = qMax(item.pageRect.height(), 1);
const int singleStep = qMax(pageStep / 10, 1);
m_verticalScrollbar->setPageStep(pageStep);
m_verticalScrollbar->setSingleStep(singleStep);
}
m_verticalOffsetRange = Range<PDFInteger>(-verticalDifference, 0);
m_verticalOffset = m_verticalOffsetRange.bound(m_verticalOffset);
m_verticalScrollbar->setValue(-m_verticalOffset);
}
else
{
m_verticalScrollbar->setVisible(false);
m_verticalOffset = -verticalDifference / 2;
m_verticalOffsetRange = Range<PDFInteger>(m_verticalOffset);
}
}
emit drawSpaceChanged();
}
QMatrix PDFDrawWidgetProxy::createPagePointToDevicePointMatrix(const PDFPage* page, const QRectF& rectangle) const
{
QMatrix matrix;
// We want to create transformation from unrotated rectangle
// to rotated page rectangle.
QRectF unrotatedRectangle = rectangle;
switch (m_controller->getPageRotation())
{
case PageRotation::None:
break;
case PageRotation::Rotate180:
{
matrix.translate(0, rectangle.top() + rectangle.bottom());
matrix.scale(1.0, -1.0);
Q_ASSERT(qFuzzyCompare(matrix.map(rectangle.topLeft()).y(), rectangle.bottom()));
Q_ASSERT(qFuzzyCompare(matrix.map(rectangle.bottomLeft()).y(), rectangle.top()));
break;
}
case PageRotation::Rotate90:
{
unrotatedRectangle = rectangle.transposed();
matrix.translate(rectangle.left(), rectangle.top());
matrix.rotate(90);
matrix.translate(-rectangle.left(), -rectangle.top());
matrix.translate(0, -unrotatedRectangle.height());
break;
}
case PageRotation::Rotate270:
{
unrotatedRectangle = rectangle.transposed();
matrix.translate(rectangle.left(), rectangle.top());
matrix.rotate(90);
matrix.translate(-rectangle.left(), -rectangle.top());
matrix.translate(0, -unrotatedRectangle.height());
matrix.translate(0.0, unrotatedRectangle.top() + unrotatedRectangle.bottom());
matrix.scale(1.0, -1.0);
matrix.translate(unrotatedRectangle.left() + unrotatedRectangle.right(), 0.0);
matrix.scale(-1.0, 1.0);
break;
}
default:
break;
}
return PDFRenderer::createPagePointToDevicePointMatrix(page, unrotatedRectangle) * matrix;
}
void PDFDrawWidgetProxy::draw(QPainter* painter, QRect rect)
{
drawPages(painter, rect, m_features);
for (IDocumentDrawInterface* drawInterface : m_drawInterfaces)
{
painter->save();
drawInterface->drawPostRendering(painter, rect);
painter->restore();
}
}
QColor PDFDrawWidgetProxy::getPaperColor()
{
QColor paperColor = getCMSManager()->getCurrentCMS()->getPaperColor();
if (m_features.testFlag(PDFRenderer::InvertColors))
{
paperColor = invertColor(paperColor);
}
return paperColor;
}
void PDFDrawWidgetProxy::drawPages(QPainter* painter, QRect rect, PDFRenderer::Features features)
{
painter->fillRect(rect, Qt::lightGray);
QMatrix baseMatrix = painter->worldMatrix();
// Use current paper color (it can be a bit different from white)
QColor paperColor = getPaperColor();
// Iterate trough pages and display them on the painter device
for (const LayoutItem& item : m_layout.items)
{
// The offsets m_horizontalOffset and m_verticalOffset are offsets to the
// topleft point of the block. But block maybe doesn't start at (0, 0),
// so we must also use translation from the block beginning.
QRect placedRect = item.pageRect.translated(m_horizontalOffset - m_layout.blockRect.left(), m_verticalOffset - m_layout.blockRect.top());
if (placedRect.intersects(rect))
{
// Clear the page space by paper color
painter->fillRect(placedRect, paperColor);
const PDFPrecompiledPage* compiledPage = m_compiler->getCompiledPage(item.pageIndex, true);
if (compiledPage && compiledPage->isValid())
{
QElapsedTimer timer;
timer.start();
const PDFPage* page = m_controller->getDocument()->getCatalog()->getPage(item.pageIndex);
QMatrix matrix = createPagePointToDevicePointMatrix(page, placedRect) * baseMatrix;
compiledPage->draw(painter, page->getCropBox(), matrix, features);
PDFTextLayoutGetter layoutGetter = m_textLayoutCompiler->getTextLayoutLazy(item.pageIndex);
// Draw text blocks/text lines, if it is enabled
if (features.testFlag(PDFRenderer::DebugTextBlocks))
{
m_textLayoutCompiler->makeTextLayout();
const PDFTextLayout& layout = layoutGetter;
const PDFTextBlocks& textBlocks = layout.getTextBlocks();
painter->save();
painter->setFont(m_widget->font());
painter->setPen(Qt::red);
painter->setBrush(QColor(255, 0, 0, 128));
QFontMetricsF fontMetrics(painter->font(), painter->device());
int blockIndex = 1;
for (const PDFTextBlock& block : textBlocks)
{
QString blockNumber = QString::number(blockIndex++);
painter->drawPath(matrix.map(block.getBoundingBox()));
painter->drawText(matrix.map(block.getTopLeft()) - QPointF(fontMetrics.width(blockNumber), 0), blockNumber, Qt::TextSingleLine, 0);
}
painter->restore();
}
if (features.testFlag(PDFRenderer::DebugTextLines))
{
m_textLayoutCompiler->makeTextLayout();
const PDFTextLayout& layout = layoutGetter;
const PDFTextBlocks& textBlocks = layout.getTextBlocks();
painter->save();
painter->setFont(m_widget->font());
painter->setPen(Qt::green);
painter->setBrush(QColor(0, 255, 0, 128));
QFontMetricsF fontMetrics(painter->font(), painter->device());
int lineIndex = 1;
for (const PDFTextBlock& block : textBlocks)
{
for (const PDFTextLine& line : block.getLines())
{
QString lineNumber = QString::number(lineIndex++);
painter->drawPath(matrix.map(line.getBoundingBox()));
painter->drawText(matrix.map(line.getTopLeft()) - QPointF(fontMetrics.width(lineNumber), 0), lineNumber, Qt::TextSingleLine, 0);
}
}
painter->restore();
}
QList<PDFRenderError> drawInterfaceErrors;
if (!features.testFlag(PDFRenderer::DenyExtraGraphics))
{
for (IDocumentDrawInterface* drawInterface : m_drawInterfaces)
{
painter->save();
drawInterface->drawPage(painter, item.pageIndex, compiledPage, layoutGetter, matrix, drawInterfaceErrors);
painter->restore();
}
}
const qint64 drawTimeNS = timer.nsecsElapsed();
// Draw rendering times
if (features.testFlag(PDFRenderer::DisplayTimes))
{
QFont font = m_widget->font();
font.setPointSize(12);
auto formatDrawTime = [](qint64 nanoseconds)
{
PDFReal miliseconds = nanoseconds / 1000000.0;
return QString::number(miliseconds, 'f', 3);
};
QFontMetrics fontMetrics(font);
const int lineSpacing = fontMetrics.lineSpacing();
painter->save();
painter->setPen(Qt::red);
painter->setFont(font);
painter->translate(placedRect.topLeft());
painter->translate(placedRect.width() / 20.0, placedRect.height() / 20.0); // Offset
painter->setBackground(QBrush(Qt::white));
painter->setBackgroundMode(Qt::OpaqueMode);
painter->drawText(0, 0, PDFTranslationContext::tr("Compile time: %1 [ms]").arg(formatDrawTime(compiledPage->getCompilingTimeNS())));
painter->translate(0, lineSpacing);
painter->drawText(0, 0, PDFTranslationContext::tr("Draw time: %1 [ms]").arg(formatDrawTime(drawTimeNS)));
painter->restore();
}
const QList<PDFRenderError>& pageErrors = compiledPage->getErrors();
if (!pageErrors.empty() || !drawInterfaceErrors.empty())
{
QList<PDFRenderError> errors = pageErrors;
if (!drawInterfaceErrors.isEmpty())
{
errors.append(drawInterfaceErrors);
}
emit renderingError(item.pageIndex, qMove(errors));
}
}
}
}
}
QImage PDFDrawWidgetProxy::drawThumbnailImage(PDFInteger pageIndex, int pixelSize) const
{
QImage image;
if (!m_controller->getDocument())
{
// No thumbnail - return empty image
return image;
}
if (const PDFPage* page = m_controller->getDocument()->getCatalog()->getPage(pageIndex))
{
QRectF pageRect = page->getRotatedMediaBox();
QSizeF pageSize = pageRect.size();
pageSize.scale(pixelSize, pixelSize, Qt::KeepAspectRatio);
QSize imageSize = pageSize.toSize();
if (imageSize.isValid())
{
const PDFPrecompiledPage* compiledPage = m_compiler->getCompiledPage(pageIndex, true);
if (compiledPage && compiledPage->isValid())
{
// Rasterize the image.
image = m_rasterizer->render(pageIndex, page, compiledPage, imageSize, m_features, m_widget->getAnnotationManager());
}
if (image.isNull())
{
image = QImage(imageSize, QImage::Format_RGBA8888_Premultiplied);
image.fill(Qt::white);
}
}
}
return image;
}
std::vector<PDFInteger> PDFDrawWidgetProxy::getPagesIntersectingRect(QRect rect) const
{
std::vector<PDFInteger> pages;
// We assume, that no more, than 32 pages will be displayed in the rectangle
pages.reserve(32);
// Iterate trough pages, place them and test, if they intersects with rectangle
for (const LayoutItem& item : m_layout.items)
{
// The offsets m_horizontalOffset and m_verticalOffset are offsets to the
// topleft point of the block. But block maybe doesn't start at (0, 0),
// so we must also use translation from the block beginning.
QRect placedRect = item.pageRect.translated(m_horizontalOffset - m_layout.blockRect.left(), m_verticalOffset - m_layout.blockRect.top());
if (placedRect.intersects(rect))
{
pages.push_back(item.pageIndex);
}
}
qSort(pages);
return pages;
}
PDFInteger PDFDrawWidgetProxy::getPageUnderPoint(QPoint point, QPointF* pagePoint) const
{
// Iterate trough pages, place them and test, if they intersects with rectangle
for (const LayoutItem& item : m_layout.items)
{
// The offsets m_horizontalOffset and m_verticalOffset are offsets to the
// topleft point of the block. But block maybe doesn't start at (0, 0),
// so we must also use translation from the block beginning.
QRect placedRect = item.pageRect.translated(m_horizontalOffset - m_layout.blockRect.left(), m_verticalOffset - m_layout.blockRect.top());
placedRect.adjust(0, 0, 1, 1);
if (placedRect.contains(point))
{
if (pagePoint)
{
const PDFPage* page = m_controller->getDocument()->getCatalog()->getPage(item.pageIndex);
QMatrix matrix = createPagePointToDevicePointMatrix(page, placedRect).inverted();
*pagePoint = matrix.map(point);
}
return item.pageIndex;
}
}
return -1;
}
PDFWidgetSnapshot PDFDrawWidgetProxy::getSnapshot() const
{
PDFWidgetSnapshot snapshot;
// Get the viewport
QRect viewport = getWidget()->rect();
// Iterate trough pages, place them and test, if they intersects with rectangle
for (const LayoutItem& item : m_layout.items)
{
// The offsets m_horizontalOffset and m_verticalOffset are offsets to the
// topleft point of the block. But block maybe doesn't start at (0, 0),
// so we must also use translation from the block beginning.
QRect placedRect = item.pageRect.translated(m_horizontalOffset - m_layout.blockRect.left(), m_verticalOffset - m_layout.blockRect.top());
if (placedRect.intersects(viewport))
{
const PDFPage* page = m_controller->getDocument()->getCatalog()->getPage(item.pageIndex);
PDFWidgetSnapshot::SnapshotItem snapshotItem;
snapshotItem.rect = placedRect;
snapshotItem.pageIndex = item.pageIndex;
snapshotItem.compiledPage = m_compiler->getCompiledPage(item.pageIndex, false);
snapshotItem.pageToDeviceMatrix = createPagePointToDevicePointMatrix(page, placedRect);
snapshot.items.emplace_back(qMove(snapshotItem));
}
}
return snapshot;
}
QRect PDFDrawWidgetProxy::getPagesIntersectingRectBoundingBox(QRect rect) const
{
QRect resultRect;
// Iterate trough pages, place them and test, if they intersects with rectangle
for (const LayoutItem& item : m_layout.items)
{
// The offsets m_horizontalOffset and m_verticalOffset are offsets to the
// topleft point of the block. But block maybe doesn't start at (0, 0),
// so we must also use translation from the block beginning.
QRect placedRect = item.pageRect.translated(m_horizontalOffset - m_layout.blockRect.left(), m_verticalOffset - m_layout.blockRect.top());
if (placedRect.intersects(rect))
{
resultRect = resultRect.united(placedRect);
}
}
return resultRect;
}
void PDFDrawWidgetProxy::performOperation(Operation operation)
{
switch (operation)
{
case NavigateDocumentStart:
{
if (m_verticalScrollbar->isVisible())
{
m_verticalScrollbar->setValue(0);
}
break;
}
case NavigateDocumentEnd:
{
if (m_verticalScrollbar->isVisible())
{
m_verticalScrollbar->setValue(m_verticalScrollbar->maximum());
}
break;
}
case NavigateNextPage:
{
if (m_verticalScrollbar->isVisible())
{
m_verticalScrollbar->setValue(m_verticalScrollbar->value() + m_verticalScrollbar->pageStep());
}
break;
}
case NavigatePreviousPage:
{
if (m_verticalScrollbar->isVisible())
{
m_verticalScrollbar->setValue(m_verticalScrollbar->value() - m_verticalScrollbar->pageStep());
}
break;
}
case NavigateNextStep:
{
if (m_verticalScrollbar->isVisible())
{
m_verticalScrollbar->setValue(m_verticalScrollbar->value() + m_verticalScrollbar->singleStep());
}
break;
}
case NavigatePreviousStep:
{
if (m_verticalScrollbar->isVisible())
{
m_verticalScrollbar->setValue(m_verticalScrollbar->value() - m_verticalScrollbar->singleStep());
}
break;
}
case ZoomIn:
{
zoom(m_zoom * ZOOM_STEP);
break;
}
case ZoomOut:
{
zoom(m_zoom / ZOOM_STEP);
break;
}
case ZoomFit:
{
zoom(getZoomHint(ZoomHint::Fit));
break;
}
case ZoomFitWidth:
{
zoom(getZoomHint(ZoomHint::FitWidth));
break;
}
case ZoomFitHeight:
{
zoom(getZoomHint(ZoomHint::FitHeight));
break;
}
case RotateRight:
{
m_controller->setPageRotation(getPageRotationRotatedRight(m_controller->getPageRotation()));
break;
}
case RotateLeft:
{
m_controller->setPageRotation(getPageRotationRotatedLeft(m_controller->getPageRotation()));
break;
}
default:
{
Q_ASSERT(false);
break;
}
}
}
QPoint PDFDrawWidgetProxy::scrollByPixels(QPoint offset)
{
PDFInteger oldHorizontalOffset = m_horizontalOffset;
PDFInteger oldVerticalOffset = m_verticalOffset;
setHorizontalOffset(m_horizontalOffset + offset.x());
setVerticalOffset(m_verticalOffset + offset.y());
return QPoint(m_horizontalOffset - oldHorizontalOffset, m_verticalOffset - oldVerticalOffset);
}
void PDFDrawWidgetProxy::zoom(PDFReal zoom)
{
const PDFReal clampedZoom = qBound(MIN_ZOOM, zoom, MAX_ZOOM);
if (m_zoom != clampedZoom)
{
const PDFReal oldHorizontalOffsetMM = m_horizontalOffset * m_pixelToDeviceSpaceUnit;
const PDFReal oldVerticalOffsetMM = m_verticalOffset * m_pixelToDeviceSpaceUnit;
m_zoom = clampedZoom;
update();
// Try to restore offsets, so we are in the same place
setHorizontalOffset(oldHorizontalOffsetMM * m_deviceSpaceUnitToPixel);
setVerticalOffset(oldVerticalOffsetMM * m_deviceSpaceUnitToPixel);
}
}
PDFReal PDFDrawWidgetProxy::getZoomHint(ZoomHint hint) const
{
QSizeF referenceSize = m_controller->getReferenceBoundingBox();
if (referenceSize.isValid())
{
const PDFReal ratio = 0.95;
const PDFReal widthMM = m_widget->widthMM() * ratio;
const PDFReal heightMM = m_widget->heightMM() * ratio;
const PDFReal widthHint = widthMM / referenceSize.width();
const PDFReal heightHint = heightMM / referenceSize.height();
switch (hint)
{
case ZoomHint::Fit:
return qMin(widthHint, heightHint);
case ZoomHint::FitWidth:
return widthHint;
case ZoomHint::FitHeight:
return heightHint;
default:
break;
}
}
// Return default 100% zoom
return 1.0;
}
void PDFDrawWidgetProxy::goToPage(PDFInteger pageIndex)
{
PDFDrawSpaceController::LayoutItem layoutItem = m_controller->getLayoutItemForPage(pageIndex);
if (layoutItem.isValid())
{
// We have found our page, navigate onto it
if (isBlockMode())
{
setBlockIndex(layoutItem.blockIndex);
}
else
{
QRect rect = fromDeviceSpace(layoutItem.pageRectMM).toRect();
setVerticalOffset(-rect.top() - m_layout.blockRect.top());
}
}
}
void PDFDrawWidgetProxy::setPageLayout(PageLayout pageLayout)
{
if (getPageLayout() != pageLayout)
{
m_controller->setPageLayout(pageLayout);
emit pageLayoutChanged();
}
}
QRectF PDFDrawWidgetProxy::fromDeviceSpace(const QRectF& rect) const
{
Q_ASSERT(rect.isValid());
return QRectF(rect.left() * m_deviceSpaceUnitToPixel,
rect.top() * m_deviceSpaceUnitToPixel,
rect.width() * m_deviceSpaceUnitToPixel,
rect.height() * m_deviceSpaceUnitToPixel);
}
void PDFDrawWidgetProxy::onTextLayoutChanged()
{
emit repaintNeeded();
emit textLayoutChanged();
}
bool PDFDrawWidgetProxy::isBlockMode() const
{
switch (m_controller->getPageLayout())
{
case PageLayout::OneColumn:
case PageLayout::TwoColumnLeft:
case PageLayout::TwoColumnRight:
return false;
case PageLayout::SinglePage:
case PageLayout::TwoPagesLeft:
case PageLayout::TwoPagesRight:
return true;
}
Q_ASSERT(false);
return false;
}
void PDFDrawWidgetProxy::updateRenderer(bool useOpenGL, const QSurfaceFormat& surfaceFormat)
{
m_useOpenGL = useOpenGL;
m_surfaceFormat = surfaceFormat;
m_rasterizer->reset(useOpenGL, surfaceFormat);
}
void PDFDrawWidgetProxy::prefetchPages(PDFInteger pageIndex)
{
// Determine number of pages, which should be prefetched. In case of two or more pages,
// we need to prefetch more pages (for example, two for two columns/two pages display mode).
int prefetchCount = 0;
switch (m_controller->getPageLayout())
{
case PageLayout::OneColumn:
case PageLayout::SinglePage:
prefetchCount = 1;
break;
case PageLayout::TwoPagesLeft:
case PageLayout::TwoPagesRight:
case PageLayout::TwoColumnLeft:
case PageLayout::TwoColumnRight:
prefetchCount = 2;
break;
default:
Q_ASSERT(false);
break;
}
if (const PDFDocument* document = getDocument())
{
const PDFInteger pageCount = document->getCatalog()->getPageCount();
const PDFInteger pageEnd = qMin(pageCount, pageIndex + prefetchCount + 1);
for (PDFInteger i = pageIndex + 1; i < pageEnd; ++i)
{
m_compiler->getCompiledPage(i, true);
}
}
}
void PDFDrawWidgetProxy::onHorizontalScrollbarValueChanged(int value)
{
if (!m_updateDisabled && !m_horizontalScrollbar->isHidden())
{
setHorizontalOffset(-value);
}
}
void PDFDrawWidgetProxy::onVerticalScrollbarValueChanged(int value)
{
if (!m_updateDisabled && !m_verticalScrollbar->isHidden())
{
if (isBlockMode())
{
setBlockIndex(value);
}
else
{
setVerticalOffset(-value);
}
}
}
void PDFDrawWidgetProxy::setHorizontalOffset(int value)
{
const PDFInteger horizontalOffset = m_horizontalOffsetRange.bound(value);
if (m_horizontalOffset != horizontalOffset)
{
m_horizontalOffset = horizontalOffset;
updateHorizontalScrollbarFromOffset();
emit drawSpaceChanged();
}
}
void PDFDrawWidgetProxy::setVerticalOffset(int value)
{
const PDFInteger verticalOffset = m_verticalOffsetRange.bound(value);
if (m_verticalOffset != verticalOffset)
{
m_verticalOffset = verticalOffset;
updateVerticalScrollbarFromOffset();
emit drawSpaceChanged();
}
}
void PDFDrawWidgetProxy::setBlockIndex(int index)
{
if (m_currentBlock != index)
{
m_currentBlock = static_cast<size_t>(index);
update();
}
}
void PDFDrawWidgetProxy::updateHorizontalScrollbarFromOffset()
{
if (!m_horizontalScrollbar->isHidden())
{
PDFBoolGuard guard(m_updateDisabled);
m_horizontalScrollbar->setValue(-m_horizontalOffset);
}
}
void PDFDrawWidgetProxy::updateVerticalScrollbarFromOffset()
{
if (!m_verticalScrollbar->isHidden() && !isBlockMode())
{
PDFBoolGuard guard(m_updateDisabled);
m_verticalScrollbar->setValue(-m_verticalOffset);
}
}
PDFWidgetAnnotationManager* PDFDrawWidgetProxy::getAnnotationManager() const
{
return m_widget->getAnnotationManager();
}
PDFRenderer::Features PDFDrawWidgetProxy::getFeatures() const
{
return m_features;
}
const PDFCMSManager* PDFDrawWidgetProxy::getCMSManager() const
{
return m_widget->getCMSManager();
}
void PDFDrawWidgetProxy::setFeatures(PDFRenderer::Features features)
{
if (m_features != features)
{
m_compiler->stop(true);
m_textLayoutCompiler->stop(true);
m_features = features;
m_compiler->start();
m_textLayoutCompiler->start();
emit pageImageChanged(true, { });
}
}
void PDFDrawWidgetProxy::setPreferredMeshResolutionRatio(PDFReal ratio)
{
if (m_meshQualitySettings.preferredMeshResolutionRatio != ratio)
{
m_compiler->stop(true);
m_meshQualitySettings.preferredMeshResolutionRatio = ratio;
m_compiler->start();
emit pageImageChanged(true, { });
}
}
void PDFDrawWidgetProxy::setMinimalMeshResolutionRatio(PDFReal ratio)
{
if (m_meshQualitySettings.minimalMeshResolutionRatio != ratio)
{
m_compiler->stop(true);
m_meshQualitySettings.minimalMeshResolutionRatio = ratio;
m_compiler->start();
emit pageImageChanged(true, { });
}
}
void PDFDrawWidgetProxy::setColorTolerance(PDFReal colorTolerance)
{
if (m_meshQualitySettings.tolerance != colorTolerance)
{
m_compiler->stop(true);
m_meshQualitySettings.tolerance = colorTolerance;
m_compiler->start();
emit pageImageChanged(true, { });
}
}
void PDFDrawWidgetProxy::onColorManagementSystemChanged()
{
m_compiler->reset();
emit pageImageChanged(true, { });
}
void PDFDrawWidgetProxy::onOptionalContentGroupStateChanged()
{
m_compiler->reset();
m_textLayoutCompiler->reset();
emit pageImageChanged(true, { });
}
void IDocumentDrawInterface::drawPage(QPainter* painter,
PDFInteger pageIndex,
const PDFPrecompiledPage* compiledPage,
PDFTextLayoutGetter& layoutGetter,
const QMatrix& pagePointToDevicePointMatrix,
QList<PDFRenderError>& errors) const
{
Q_UNUSED(painter);
Q_UNUSED(pageIndex);
Q_UNUSED(compiledPage);
Q_UNUSED(layoutGetter);
Q_UNUSED(pagePointToDevicePointMatrix);
Q_UNUSED(errors);
}
void IDocumentDrawInterface::drawPostRendering(QPainter* painter, QRect rect) const
{
Q_UNUSED(painter);
Q_UNUSED(rect);
}
const PDFWidgetSnapshot::SnapshotItem* PDFWidgetSnapshot::getPageSnapshot(PDFInteger pageIndex) const
{
auto it = std::find_if(items.cbegin(), items.cend(), [pageIndex](const auto& item) { return item.pageIndex == pageIndex; });
if (it != items.cend())
{
return &*it;
}
return nullptr;
}
} // namespace pdf
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