Bugfixing for patterns

PdfForQtLib/sources/pdfcolorspaces.cpp

@@ -350,12 +350,11 @@ PDFColorSpacePointer PDFAbstractColorSpace::createColorSpaceImpl(const PDFDictio
                     {
                         stream = colorSpaceSettings.getStream();
                     }
+                }
 
                 if (name == COLOR_SPACE_NAME_PATTERN)
                 {
-                        PDFPatternPtr pattern = PDFPattern::createPattern(colorSpaceDictionary, document, array->getItem(1));
+                    return PDFColorSpacePointer(new PDFPatternColorSpace(std::make_shared<PDFInvalidPattern>()));
-                        return PDFColorSpacePointer(new PDFPatternColorSpace(qMove(pattern)));
-                    }
                 }
 
                 if (dictionary)
@@ -414,6 +413,11 @@ PDFColorSpacePointer PDFAbstractColorSpace::createDeviceColorSpaceByNameImpl(con
         throw PDFParserException(PDFTranslationContext::tr("Can't load color space, because color space structure is too complex."));
     }
 
+    if (name == COLOR_SPACE_NAME_PATTERN)
+    {
+        return PDFColorSpacePointer(new PDFPatternColorSpace(std::make_shared<PDFInvalidPattern>()));
+    }
+
     if (name == COLOR_SPACE_NAME_DEVICE_GRAY || name == COLOR_SPACE_NAME_ABBREVIATION_DEVICE_GRAY)
     {
         if (colorSpaceDictionary && colorSpaceDictionary->hasKey(COLOR_SPACE_NAME_DEFAULT_GRAY))
@@ -985,7 +989,7 @@ const unsigned char* PDFImageData::getRow(unsigned int rowIndex) const
 
 QColor PDFPatternColorSpace::getDefaultColor() const
 {
-    throw PDFParserException(PDFTranslationContext::tr("Pattern doesn't have default color."));
+    return QColor(Qt::transparent);
 }
 
 QColor PDFPatternColorSpace::getColor(const PDFColor& color) const

PdfForQtLib/sources/pdfpagecontentprocessor.cpp

@@ -177,6 +177,7 @@ void PDFPageContentProcessor::initDictionaries(const PDFObject& resourcesObject)
     m_extendedGraphicStateDictionary = getDictionary(PDF_RESOURCE_EXTGSTATE);
     m_propertiesDictionary = getDictionary("Properties");
     m_shadingDictionary = getDictionary("Shading");
+    m_patternDictionary = getDictionary("Pattern");
 }
 
 PDFPageContentProcessor::PDFPageContentProcessor(const PDFPage* page,
@@ -194,6 +195,7 @@ PDFPageContentProcessor::PDFPageContentProcessor(const PDFPage* page,
     m_extendedGraphicStateDictionary(nullptr),
     m_propertiesDictionary(nullptr),
     m_shadingDictionary(nullptr),
+    m_patternDictionary(nullptr),
     m_textBeginEndState(0),
     m_compatibilityBeginEndState(0),
     m_patternBaseMatrix(pagePointToDevicePointMatrix),
@@ -595,8 +597,19 @@ void PDFPageContentProcessor::processPathPainting(const QPainterPath& path, bool
         const PDFPattern* pattern = getGraphicState()->getFillColorSpace()->getPattern();
         if (pattern)
         {
-            if (const PDFShadingPattern* shadingPatern = pattern->getShadingPattern())
+            switch (pattern->getType())
             {
+                case PatternType::Tiling:
+                {
+                    // TODO: Implement tiling pattern
+                    throw PDFParserException(PDFTranslationContext::tr("Tiling pattern not implemented."));
+                    break;
+                }
+
+                case PatternType::Shading:
+                {
+                    const PDFShadingPattern* shadingPatern = pattern->getShadingPattern();
+
                     // We must create a mesh and then draw pattern
                     PDFMeshQualitySettings settings;
                     settings.deviceSpaceMeshingArea = getPageBoundingRectDeviceSpace();
@@ -611,11 +624,20 @@ void PDFPageContentProcessor::processPathPainting(const QPainterPath& path, bool
                     mesh.setBoundingPath(boundingPath);
 
                     performMeshPainting(mesh);
+                    break;
                 }
-            else
+
+                case PatternType::Invalid:
+                {
+                    throw PDFParserException(PDFTranslationContext::tr("Invalid pattern."));
+                    break;
+                }
+
+                default:
                 {
-                // TODO: Implement tiling pattern
                     Q_ASSERT(false);
+                    break;
+                }
             }
 
             fill = false;
@@ -627,8 +649,19 @@ void PDFPageContentProcessor::processPathPainting(const QPainterPath& path, bool
         const PDFPattern* pattern = getGraphicState()->getStrokeColorSpace()->getPattern();
         if (pattern)
         {
-            if (const PDFShadingPattern* shadingPatern = pattern->getShadingPattern())
+            switch (pattern->getType())
             {
+                case PatternType::Tiling:
+                {
+                    // TODO: Implement tiling pattern
+                    throw PDFParserException(PDFTranslationContext::tr("Tiling pattern not implemented."));
+                    break;
+                }
+
+                case PatternType::Shading:
+                {
+                    const PDFShadingPattern* shadingPatern = pattern->getShadingPattern();
+
                     // We must create a mesh and then draw pattern
                     PDFMeshQualitySettings settings;
                     settings.deviceSpaceMeshingArea = getPageBoundingRectDeviceSpace();
@@ -657,11 +690,20 @@ void PDFPageContentProcessor::processPathPainting(const QPainterPath& path, bool
                     mesh.setBoundingPath(boundingPath);
 
                     performMeshPainting(mesh);
+                    break;
                 }
-            else
+
+                case PatternType::Invalid:
+                {
+                    throw PDFParserException(PDFTranslationContext::tr("Invalid pattern."));
+                    break;
+                }
+
+                default:
                 {
-                // TODO: Implement tiling pattern
                     Q_ASSERT(false);
+                    break;
+                }
             }
 
             stroke = false;
@@ -1807,8 +1849,35 @@ void PDFPageContentProcessor::operatorColorSetStrokingColorN()
 {
     // In our implementation, operator 'SC' can also set color using all color spaces
     // PDF reference 1.7 allows here Pattern, Separation, DeviceN and ICCBased color spaces here,
-    // but default operator can use them (with exception of Pattern color space).
+    // but default operator can use them (with exception of Pattern color space). For pattern color space,
+    // we treat this differently.
+    const PDFAbstractColorSpace* colorSpace = m_graphicState.getStrokeColorSpace();
+    if (colorSpace->getPattern())
+    {
+        if (m_operands.size() > 0)
+        {
+            // TODO: Implement tiling pattern colors
+            PDFOperandName name = readOperand<PDFOperandName>(m_operands.size() - 1);
+            if (m_patternDictionary && m_patternDictionary->hasKey(name.name))
+            {
+                // Create the pattern
+                PDFPatternPtr pattern = PDFPattern::createPattern(m_colorSpaceDictionary, m_document, m_patternDictionary->get(name.name));
+                m_graphicState.setStrokeColorSpace(QSharedPointer<PDFAbstractColorSpace>(new PDFPatternColorSpace(qMove(pattern))));
+                updateGraphicState();
+                return;
+            }
+
+            throw PDFRendererException(RenderErrorType::Error, PDFTranslationContext::tr("Invalid pattern for Pattern color space."));
+        }
+        else
+        {
+            throw PDFRendererException(RenderErrorType::Error, PDFTranslationContext::tr("Invalid pattern for Pattern color space."));
+        }
+    }
+    else
+    {
         operatorColorSetStrokingColor();
+    }
 }
 
 void PDFPageContentProcessor::operatorColorSetFillingColor()
@@ -1838,8 +1907,35 @@ void PDFPageContentProcessor::operatorColorSetFillingColorN()
 {
     // In our implementation, operator 'sc' can also set color using all color spaces
     // PDF reference 1.7 allows here Pattern, Separation, DeviceN and ICCBased color spaces here,
-    // but default operator can use them (with exception of Pattern color space).
+    // but default operator can use them (with exception of Pattern color space). For pattern color space,
+    // we treat this differently.
+    const PDFAbstractColorSpace* colorSpace = m_graphicState.getFillColorSpace();
+    if (colorSpace->getPattern())
+    {
+        if (m_operands.size() > 0)
+        {
+            // TODO: Implement tiling pattern colors
+            PDFOperandName name = readOperand<PDFOperandName>(m_operands.size() - 1);
+            if (m_patternDictionary && m_patternDictionary->hasKey(name.name))
+            {
+                // Create the pattern
+                PDFPatternPtr pattern = PDFPattern::createPattern(m_colorSpaceDictionary, m_document, m_patternDictionary->get(name.name));
+                m_graphicState.setFillColorSpace(QSharedPointer<PDFAbstractColorSpace>(new PDFPatternColorSpace(qMove(pattern))));
+                updateGraphicState();
+                return;
+            }
+
+            throw PDFRendererException(RenderErrorType::Error, PDFTranslationContext::tr("Invalid pattern for Pattern color space."));
+        }
+        else
+        {
+            throw PDFRendererException(RenderErrorType::Error, PDFTranslationContext::tr("Invalid pattern for Pattern color space."));
+        }
+    }
+    else
+    {
         operatorColorSetFillingColor();
+    }
 }
 
 void PDFPageContentProcessor::operatorColorSetDeviceGrayStroking(PDFReal gray)
@@ -2864,7 +2960,8 @@ PDFPageContentProcessor::PDFPageContentProcessorStateGuard::PDFPageContentProces
     m_xobjectDictionary(processor->m_xobjectDictionary),
     m_extendedGraphicStateDictionary(processor->m_extendedGraphicStateDictionary),
     m_propertiesDictionary(processor->m_propertiesDictionary),
-    m_shadingDictionary(processor->m_shadingDictionary)
+    m_shadingDictionary(processor->m_shadingDictionary),
+    m_patternDictionary(processor->m_patternDictionary)
 {
     m_processor->operatorSaveGraphicState();
 }
@@ -2878,6 +2975,7 @@ PDFPageContentProcessor::PDFPageContentProcessorStateGuard::~PDFPageContentProce
     m_processor->m_extendedGraphicStateDictionary = m_extendedGraphicStateDictionary;
     m_processor->m_propertiesDictionary = m_propertiesDictionary;
     m_processor->m_shadingDictionary = m_shadingDictionary;
+    m_processor->m_patternDictionary = m_patternDictionary;
 
     m_processor->operatorRestoreGraphicState();
 }

PdfForQtLib/sources/pdfpagecontentprocessor.h

@@ -502,6 +502,7 @@ private:
         const PDFDictionary* m_extendedGraphicStateDictionary;
         const PDFDictionary* m_propertiesDictionary;
         const PDFDictionary* m_shadingDictionary;
+        const PDFDictionary* m_patternDictionary;
     };
 
     /// Wrapper for PDF Name
@@ -724,6 +725,7 @@ private:
     const PDFDictionary* m_extendedGraphicStateDictionary;
     const PDFDictionary* m_propertiesDictionary;
     const PDFDictionary* m_shadingDictionary;
+    const PDFDictionary* m_patternDictionary;
 
     // Default color spaces
     PDFColorSpacePointer m_deviceGrayColorSpace;

PdfForQtLib/sources/pdfpattern.cpp

@@ -48,11 +48,6 @@ PDFPatternPtr PDFPattern::createPattern(const PDFDictionary* colorSpaceDictionar
         const PDFDictionary* patternDictionary = dereferencedObject.getDictionary();
         PDFDocumentDataLoaderDecorator loader(document);
 
-        if (loader.readNameFromDictionary(patternDictionary, "Type") != "Pattern")
-        {
-            throw PDFParserException(PDFTranslationContext::tr("Invalid pattern."));
-        }
-
         const PatternType patternType = static_cast<PatternType>(loader.readIntegerFromDictionary(patternDictionary, "PatternType", static_cast<PDFInteger>(PatternType::Invalid)));
         switch (patternType)
         {
@@ -89,16 +84,27 @@ PDFPatternPtr PDFPattern::createShadingPattern(const PDFDictionary* colorSpaceDi
                                                bool ignoreBackgroundColor)
 {
     const PDFObject& dereferencedShadingObject = document->getObject(shadingObject);
-    if (!dereferencedShadingObject.isDictionary())
+    if (!dereferencedShadingObject.isDictionary() && !dereferencedShadingObject.isStream())
     {
         throw PDFParserException(PDFTranslationContext::tr("Invalid shading."));
     }
 
     PDFDocumentDataLoaderDecorator loader(document);
-    const PDFDictionary* shadingDictionary = dereferencedShadingObject.getDictionary();
+    const PDFDictionary* shadingDictionary = nullptr;
+    const PDFStream* stream = nullptr;
+
+    if (dereferencedShadingObject.isDictionary())
+    {
+        shadingDictionary = dereferencedShadingObject.getDictionary();
+    }
+    else if (dereferencedShadingObject.isStream())
+    {
+        stream = dereferencedShadingObject.getStream();
+        shadingDictionary = stream->getDictionary();
+    }
 
     // Parse common data for all shadings
-    PDFColorSpacePointer colorSpace = PDFAbstractColorSpace::createColorSpace(colorSpaceDictionary, document, shadingDictionary->get("ColorSpace"));
+    PDFColorSpacePointer colorSpace = PDFAbstractColorSpace::createColorSpace(colorSpaceDictionary, document, document->getObject(shadingDictionary->get("ColorSpace")));
 
     if (colorSpace->getPattern())
     {
@@ -1183,5 +1189,6 @@ PDFMesh PDFRadialShading::createMesh(const PDFMeshQualitySettings& settings) con
 }
 
 // TODO: Apply graphic state of the pattern
+// TODO: Implement settings of meshing in the settings dialog
 
 }   // namespace pdf

PdfForQtLib/sources/pdfpattern.h

@@ -204,6 +204,15 @@ protected:
     QMatrix m_matrix;
 };
 
+class PDFInvalidPattern : public PDFPattern
+{
+public:
+    explicit PDFInvalidPattern() = default;
+
+    virtual PatternType getType() const { return PatternType::Invalid; }
+    virtual const PDFShadingPattern* getShadingPattern() const { return nullptr; }
+};
+
 /// Shading pattern - smooth color distribution along the pattern's space
 class PDFShadingPattern : public PDFPattern
 {