Simple rendering

PdfForQtLib/PdfForQtLib.pro

@@ -49,7 +49,9 @@ SOURCES += \
     sources/pdfdrawspacecontroller.cpp \
     sources/pdfdrawwidget.cpp \
     sources/pdfcolorspaces.cpp \
-    sources/pdfrenderer.cpp
+    sources/pdfrenderer.cpp \
+    sources/pdfpagecontentprocessor.cpp \
+    sources/pdfpainter.cpp
 
 HEADERS += \
     sources/pdfobject.h \
@@ -71,7 +73,9 @@ HEADERS += \
     sources/pdfflatarray.h \
     sources/pdfcolorspaces.h \
     sources/pdfrenderer.h \
-    sources/pdfrenderer_impl.h
+    sources/pdfpagecontentprocessor.h \
+    sources/pdfpainter.h \
+    sources/pdfutils.h
 
 unix {
     target.path = /usr/lib

PdfForQtLib/sources/pdfcolorspaces.cpp

@@ -221,6 +221,10 @@ PDFColorSpacePointer PDFAbstractColorSpace::createDeviceColorSpaceByNameImpl(con
             return PDFColorSpacePointer(new PDFDeviceCMYKColorSpace());
         }
     }
+    else if (colorSpaceDictionary && colorSpaceDictionary->hasKey(name))
+    {
+        return createColorSpaceImpl(colorSpaceDictionary, document, document->getObject(colorSpaceDictionary->get(name)), recursion);
+    }
 
     throw PDFParserException(PDFTranslationContext::tr("Invalid color space."));
     return PDFColorSpacePointer();

PdfForQtLib/sources/pdfdrawspacecontroller.cpp

@@ -533,11 +533,6 @@ void PDFDrawWidgetProxy::draw(QPainter* painter, QRect rect)
             // Clear the page space by white color
             painter->fillRect(placedRect, Qt::white);
 
-            QFont font = m_widget->font();
-            font.setPixelSize(placedRect.height() * 0.75);
-            painter->setFont(font);
-            painter->drawText(placedRect, Qt::AlignCenter, QString::number(item.pageIndex + 1));
-
             PDFRenderer renderer(m_controller->getDocument());
             QList<PDFRenderError> errors = renderer.render(painter, placedRect, item.pageIndex);
         }

PdfForQtLib/sources/pdfflatarray.h

@@ -43,7 +43,7 @@ class PDFFlatArray
 public:
     explicit PDFFlatArray() :
         m_flatBlock(),
-        m_flatBlockEndIterator(m_flatBlock.begin()),
+        m_flatBlockItemCount(0),
         m_variableBlock()
     {
 
@@ -52,7 +52,7 @@ public:
     template<typename... Arguments, typename std::enable_if<sizeof...(Arguments) <= FlatSize, int>::type = 0>
     explicit inline PDFFlatArray(Arguments... arguments) :
         m_flatBlock({ arguments... }),
-        m_flatBlockEndIterator(std::next(m_flatBlock.begin(), sizeof...(Arguments))),
+        m_flatBlockItemCount(sizeof...(Arguments)),
         m_variableBlock()
     {
 
@@ -120,15 +120,15 @@ public:
 
     void clear()
     {
-        m_flatBlockEndIterator = m_flatBlock.begin();
+        m_flatBlockItemCount = 0;
         m_variableBlock.clear();
     }
 
     void push_back(T object)
     {
-        if (m_flatBlockEndIterator != m_flatBlock.cend())
+        if (m_flatBlockItemCount < m_flatBlock.size())
         {
-            *m_flatBlockEndIterator++ = std::move(object);
+            m_flatBlock[m_flatBlockItemCount++] = std::move(object);
         }
         else
         {
@@ -137,10 +137,10 @@ public:
     }
 
 private:
-    size_t getFlatBlockSize() const { return std::distance(m_flatBlock.cbegin(), std::array<T, FlatSize>::const_iterator(m_flatBlockEndIterator)); }
+    size_t getFlatBlockSize() const { return m_flatBlockItemCount; }
 
     std::array<T, FlatSize> m_flatBlock;
-    typename std::array<T, FlatSize>::iterator m_flatBlockEndIterator; ///< Pointer to the end of flat block
+    size_t m_flatBlockItemCount; ///< Number of items in the flat block
     std::vector<T> m_variableBlock;
 };
 

PdfForQtLib/sources/pdfpagecontentprocessor.h

@@ -15,8 +15,8 @@
 //    You should have received a copy of the GNU Lesser General Public License
 //    along with PDFForQt.  If not, see <https://www.gnu.org/licenses/>.
 
-#ifndef PDFRENDERER_IMPL_H
+#ifndef PDFPAGECONTENTPROCESSOR_H
-#define PDFRENDERER_IMPL_H
+#define PDFPAGECONTENTPROCESSOR_H
 
 #include "pdfrenderer.h"
 #include "pdfparser.h"
@@ -54,6 +54,7 @@ class PDFPageContentProcessor
 {
 public:
     explicit PDFPageContentProcessor(const PDFPage* page, const PDFDocument* document);
+    virtual ~PDFPageContentProcessor();
 
     enum class Operator
     {
@@ -189,6 +190,9 @@ protected:
         inline bool operator==(const PDFLineDashPattern& other) const { return m_dashArray == other.m_dashArray && m_dashOffset == other.m_dashOffset; }
         inline bool operator!=(const PDFLineDashPattern& other) const { return !(*this == other); }
 
+        /// Is line solid? Function returns true, if yes.
+        bool isSolid() const { return m_dashArray.empty(); }
+
     private:
         std::vector<PDFReal> m_dashArray;
         PDFReal m_dashOffset = 0.0;
@@ -223,7 +227,8 @@ protected:
             StateLineDashPattern                = 0x0200,
             StateRenderingIntent                = 0x0400,
             StateFlatness                       = 0x0800,
-            StateSmoothness                     = 0x1000
+            StateSmoothness                     = 0x1000,
+            StateAll                            = 0xFFFF
         };
 
         Q_DECLARE_FLAGS(StateFlags, StateFlag)
@@ -322,6 +327,13 @@ protected:
     /// \param order If this function is called before the operation, or after the operation.
     virtual void performRestoreGraphicState(ProcessOrder order);
 
+    /// Returns current graphic state
+    const PDFPageContentProcessorState* getGraphicState() const { return &m_graphicState; }
+
+    /// Adds error to the error list
+    /// \param error Error message
+    void addError(const QString& error) { m_errorList.append(PDFRenderError(RenderErrorType::Error, error)); }
+
 private:
     /// Process the content stream
     void processContentStream(const PDFStream* stream);
@@ -490,4 +502,4 @@ private:
 
 }   // namespace pdf
 
-#endif // PDFRENDERER_IMPL_H
+#endif // PDFPAGECONTENTPROCESSOR_H

PdfForQtLib/sources/pdfpainter.cpp

@@ -0,0 +1,182 @@
+//    Copyright (C) 2019 Jakub Melka
+//
+//    This file is part of PdfForQt.
+//
+//    PdfForQt 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.
+//
+//    PdfForQt 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 PDFForQt.  If not, see <https://www.gnu.org/licenses/>.
+
+#include "pdfpainter.h"
+
+#include <QPainter>
+
+namespace pdf
+{
+
+
+PDFPainter::PDFPainter(QPainter* painter, PDFRenderer::Features features, QMatrix pagePointToDevicePointMatrix, const PDFPage* page, const PDFDocument* document) :
+    PDFPageContentProcessor(page, document),
+    m_painter(painter),
+    m_features(features),
+    m_pagePointToDevicePointMatrix(pagePointToDevicePointMatrix)
+{
+    Q_ASSERT(painter);
+    Q_ASSERT(pagePointToDevicePointMatrix.isInvertible());
+
+    m_painter->save();
+}
+
+PDFPainter::~PDFPainter()
+{
+    m_painter->restore();
+}
+
+void PDFPainter::performPathPainting(const QPainterPath& path, bool stroke, bool fill, Qt::FillRule fillRule)
+{
+    if ((!stroke && !fill) || path.isEmpty())
+    {
+        // No operation requested - either path is empty, or neither stroking or filling
+        return;
+    }
+
+    if (stroke)
+    {
+        m_painter->setPen(getCurrentPen());
+    }
+    else
+    {
+        m_painter->setPen(Qt::NoPen);
+    }
+
+    if (fill)
+    {
+        m_painter->setBrush(getCurrentBrush());
+    }
+    else
+    {
+        m_painter->setBrush(Qt::NoBrush);
+    }
+
+    m_painter->setRenderHint(QPainter::Antialiasing, m_features.testFlag(PDFRenderer::Antialiasing));
+
+    Q_ASSERT(path.fillRule() == fillRule);
+    m_painter->drawPath(path);
+}
+
+void PDFPainter::performClipping(const QPainterPath& path, Qt::FillRule fillRule)
+{
+    Q_ASSERT(path.fillRule() == fillRule);
+    if (m_painter->hasClipping())
+    {
+        m_painter->setClipPath(path, Qt::IntersectClip);
+    }
+    else
+    {
+        addError(PDFTranslationContext::tr("The paint device doesn't support clipping. Path was not clipped."));
+    }
+}
+
+void PDFPainter::performUpdateGraphicsState(const PDFPageContentProcessorState& state)
+{
+    const PDFPageContentProcessorState::StateFlags flags = state.getStateFlags();
+
+    // If current transformation matrix has changed, then update it
+    if (flags.testFlag(PDFPageContentProcessorState::StateCurrentTransformationMatrix))
+    {
+        m_painter->setWorldMatrix(m_pagePointToDevicePointMatrix * state.getCurrentTransformationMatrix(), false);
+    }
+
+    if (flags.testFlag(PDFPageContentProcessorState::StateStrokeColor) ||
+        flags.testFlag(PDFPageContentProcessorState::StateLineWidth) ||
+        flags.testFlag(PDFPageContentProcessorState::StateLineCapStyle) ||
+        flags.testFlag(PDFPageContentProcessorState::StateLineJoinStyle) ||
+        flags.testFlag(PDFPageContentProcessorState::StateMitterLimit) ||
+        flags.testFlag(PDFPageContentProcessorState::StateLineDashPattern))
+    {
+        m_currentPen.dirty();
+    }
+
+    if (flags.testFlag(PDFPageContentProcessorState::StateFillColor))
+    {
+        m_currentBrush.dirty();
+    }
+}
+
+void PDFPainter::performSaveGraphicState(ProcessOrder order)
+{
+    if (order == ProcessOrder::AfterOperation)
+    {
+        m_painter->save();
+    }
+}
+
+void PDFPainter::performRestoreGraphicState(ProcessOrder order)
+{
+    if (order == ProcessOrder::BeforeOperation)
+    {
+        m_painter->restore();
+    }
+}
+
+QPen PDFPainter::getCurrentPenImpl() const
+{
+    const PDFPageContentProcessorState* graphicState = getGraphicState();
+    const QColor& color = graphicState->getStrokeColor();
+    if (color.isValid())
+    {
+        const PDFReal lineWidth = graphicState->getLineWidth();
+        Qt::PenCapStyle penCapStyle = graphicState->getLineCapStyle();
+        Qt::PenJoinStyle penJoinStyle = graphicState->getLineJoinStyle();
+        const PDFLineDashPattern& lineDashPattern = graphicState->getLineDashPattern();
+        const PDFReal mitterLimit = graphicState->getMitterLimit();
+
+        QPen pen(color);
+
+        pen.setWidthF(lineWidth);
+        pen.setCapStyle(penCapStyle);
+        pen.setJoinStyle(penJoinStyle);
+        pen.setMiterLimit(mitterLimit);
+
+        if (lineDashPattern.isSolid())
+        {
+            pen.setStyle(Qt::SolidLine);
+        }
+        else
+        {
+            pen.setStyle(Qt::CustomDashLine);
+            pen.setDashPattern(QVector<PDFReal>::fromStdVector(lineDashPattern.getDashArray()));
+            pen.setDashOffset(lineDashPattern.getDashOffset());
+        }
+
+        return pen;
+    }
+    else
+    {
+        return QPen(Qt::NoPen);
+    }
+}
+
+QBrush PDFPainter::getCurrentBrushImpl() const
+{
+    const PDFPageContentProcessorState* graphicState = getGraphicState();
+    const QColor& color = graphicState->getFillColor();
+    if (color.isValid())
+    {
+        return QBrush(color, Qt::SolidPattern);
+    }
+    else
+    {
+        return QBrush(Qt::NoBrush);
+    }
+}
+
+}   // namespace pdf

PdfForQtLib/sources/pdfpainter.h

@@ -0,0 +1,69 @@
+//    Copyright (C) 2019 Jakub Melka
+//
+//    This file is part of PdfForQt.
+//
+//    PdfForQt 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.
+//
+//    PdfForQt 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 PDFForQt.  If not, see <https://www.gnu.org/licenses/>.
+
+#ifndef PDFPAINTER_H
+#define PDFPAINTER_H
+
+#include "pdfutils.h"
+#include "pdfrenderer.h"
+#include "pdfpagecontentprocessor.h"
+
+#include <QPen>
+#include <QBrush>
+
+namespace pdf
+{
+
+/// Processor, which processes PDF's page commands on the QPainter. It works with QPainter
+/// and with transformation matrix, which translates page points to the device points.
+class PDFPainter : public PDFPageContentProcessor
+{
+public:
+    /// Constructs new PDFPainter object, with default parameters.
+    explicit PDFPainter(QPainter* painter, PDFRenderer::Features features, QMatrix pagePointToDevicePointMatrix, const PDFPage* page, const PDFDocument* document);
+    virtual ~PDFPainter() override;
+
+protected:
+    virtual void performPathPainting(const QPainterPath& path, bool stroke, bool fill, Qt::FillRule fillRule) override;
+    virtual void performClipping(const QPainterPath& path, Qt::FillRule fillRule) override;
+    virtual void performUpdateGraphicsState(const PDFPageContentProcessorState& state) override;
+    virtual void performSaveGraphicState(ProcessOrder order) override;
+    virtual void performRestoreGraphicState(ProcessOrder order) override;
+
+private:
+    /// Returns current pen
+    const QPen& getCurrentPen() { return m_currentPen.get(this, &PDFPainter::getCurrentPenImpl); }
+
+    /// Returns current brush
+    const QBrush& getCurrentBrush() { return m_currentBrush.get(this, &PDFPainter::getCurrentBrushImpl); }
+
+    /// Returns current pen (implementation)
+    QPen getCurrentPenImpl() const;
+
+    /// Returns current brush (implementation)
+    QBrush getCurrentBrushImpl() const;
+
+    QPainter* m_painter;
+    PDFRenderer::Features m_features;
+    QMatrix m_pagePointToDevicePointMatrix;
+    PDFCachedItem<QPen> m_currentPen;
+    PDFCachedItem<QBrush> m_currentBrush;
+};
+
+}   // namespace pdf
+
+#endif // PDFPAINTER_H

PdfForQtLib/sources/pdfrenderer.h

@@ -53,9 +53,9 @@ public:
 
     enum Feature
     {
-        Antialiasing,       ///< Antialiasing for lines, shapes, etc.
+        Antialiasing        = 0x0001,   ///< Antialiasing for lines, shapes, etc.
-        TextAntialiasing,   ///< Antialiasing for drawing text
+        TextAntialiasing    = 0x0002,   ///< Antialiasing for drawing text
-        SmoothImages        ///< Adjust images to the device space using smooth transformation (slower, but better performance quality)
+        SmoothImages        = 0x0004    ///< Adjust images to the device space using smooth transformation (slower, but better performance quality)
     };
 
     Q_DECLARE_FLAGS(Features, Feature)
@@ -68,6 +68,11 @@ public:
     /// \param pageIndex Index of the page to be painted
     QList<PDFRenderError> render(QPainter* painter, const QRectF& rectangle, size_t pageIndex) const;
 
+    /// Paints desired page onto the painter. Page is painted using \p matrix, which maps page coordinates
+    /// to the device coordinates. If the page doesn't exist, then error is returned. No exception is thrown.
+    /// Rendering errors are reported and returned in the error list. If no error occured, empty list is returned.
+    QList<PDFRenderError> render(QPainter* painter, const QMatrix& matrix, size_t pageIndex) const;
+
 private:
     const PDFDocument* m_document;
     Features m_features;

PdfForQtLib/sources/pdfutils.h

@@ -0,0 +1,69 @@
+//    Copyright (C) 2019 Jakub Melka
+//
+//    This file is part of PdfForQt.
+//
+//    PdfForQt 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.
+//
+//    PdfForQt 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 PDFForQt.  If not, see <https://www.gnu.org/licenses/>.
+
+
+#ifndef PDFUTILS_H
+#define PDFUTILS_H
+
+namespace pdf
+{
+
+/// Class for easy storing of cached item. This class is not thread safe,
+/// and for this reason, access function are not constant (they can modify the
+/// object).
+template<typename T>
+class PDFCachedItem
+{
+public:
+    explicit inline PDFCachedItem() :
+        m_dirty(true),
+        m_object()
+    {
+
+    }
+
+    /// Returns the cached object. If object is dirty, then cached object is refreshed.
+    /// \param holder Holder object, which owns the cached item
+    /// \param function Refresh function
+    template<typename H>
+    inline const T& get(const H* holder, T(H::* function)(void) const)
+    {
+        if (m_dirty)
+        {
+            m_object = (holder->*function)();
+            m_dirty = false;
+        }
+
+        return m_object;
+    }
+
+    /// Invalidates the cached item, so it must be refreshed from the cache next time,
+    /// if it is accessed.
+    inline void dirty()
+    {
+        m_dirty = true;
+        m_object = T();
+    }
+
+private:
+    bool m_dirty;
+    T m_object;
+};
+
+}   // namespace pdf
+
+#endif // PDFUTILS_H