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https://github.com/JakubMelka/PDF4QT.git
synced 2025-06-05 21:59:17 +02:00
Path constructing operands
This commit is contained in:
Jakub Melka
@ -16,6 +16,7 @@
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// along with PDFForQt. If not, see <https://www.gnu.org/licenses/>.
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#include "pdfrenderer.h"
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#include "pdfrenderer_impl.h"
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#include "pdfdocument.h"
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namespace pdf
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@ -41,6 +42,113 @@ namespace pdf
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// Marked content: MP, DP, BMC, BDC, EMC
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// Compatibility: BX, EX
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static constexpr const std::pair<const char*, PDFPageContentProcessor::Operator> operators[] =
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{
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// General graphic state w, J, j, M, d, ri, i, gs
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{ "w", PDFPageContentProcessor::Operator::SetLineWidth },
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{ "J", PDFPageContentProcessor::Operator::SetLineCap },
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{ "j", PDFPageContentProcessor::Operator::SetLineJoin },
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{ "M", PDFPageContentProcessor::Operator::SetMitterLimit },
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{ "d", PDFPageContentProcessor::Operator::SetLineDashPattern },
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{ "ri", PDFPageContentProcessor::Operator::SetRenderingIntent },
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{ "i", PDFPageContentProcessor::Operator::SetFlatness },
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{ "gs", PDFPageContentProcessor::Operator::SetGraphicState },
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// Special graphic state: q, Q, cm
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{ "q", PDFPageContentProcessor::Operator::SaveGraphicState },
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{ "Q", PDFPageContentProcessor::Operator::RestoreGraphicState },
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{ "cm", PDFPageContentProcessor::Operator::AdjustCurrentTransformationMatrix },
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// Path construction: m, l, c, v, y, h, re
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{ "m", PDFPageContentProcessor::Operator::MoveCurrentPoint },
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{ "l", PDFPageContentProcessor::Operator::LineTo },
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{ "c", PDFPageContentProcessor::Operator::Bezier123To },
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{ "v", PDFPageContentProcessor::Operator::Bezier23To },
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{ "y", PDFPageContentProcessor::Operator::Bezier13To },
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{ "h", PDFPageContentProcessor::Operator::EndSubpath },
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{ "re", PDFPageContentProcessor::Operator::Rectangle },
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// Path painting: S, s, f, F, f*, B, B*, b, b*, n
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{ "S", PDFPageContentProcessor::Operator::StrokePath },
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{ "s", PDFPageContentProcessor::Operator::CloseAndStrokePath },
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{ "f", PDFPageContentProcessor::Operator::FillPathWinding },
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{ "F", PDFPageContentProcessor::Operator::FillPathWinding2 },
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{ "f*", PDFPageContentProcessor::Operator::FillPathEvenOdd },
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{ "B", PDFPageContentProcessor::Operator::StrokeAndFillWinding },
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{ "B*", PDFPageContentProcessor::Operator::StrokeAndFillEvenOdd },
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{ "b", PDFPageContentProcessor::Operator::CloseAndStrokeAndFillWinding },
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{ "b*", PDFPageContentProcessor::Operator::CloseAndStrokeAndFillEvenOdd },
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{ "n", PDFPageContentProcessor::Operator::ClearPath },
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// Clipping paths: W, W*
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{ "W", PDFPageContentProcessor::Operator::ClipWinding },
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{ "W*", PDFPageContentProcessor::Operator::ClipEvenOdd },
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// Text object: BT, ET
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{ "BT", PDFPageContentProcessor::Operator::TextBegin },
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{ "ET", PDFPageContentProcessor::Operator::TextEnd },
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// Text state: Tc, Tw, Tz, TL, Tf, Tr, Ts
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{ "Tc", PDFPageContentProcessor::Operator::TextSetCharacterSpacing },
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{ "Tw", PDFPageContentProcessor::Operator::TextSetWordSpacing },
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{ "Tz", PDFPageContentProcessor::Operator::TextSetHorizontalScale },
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{ "TL", PDFPageContentProcessor::Operator::TextSetLeading },
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{ "Tf", PDFPageContentProcessor::Operator::TextSetFontAndFontSize },
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{ "Tr", PDFPageContentProcessor::Operator::TextSetRenderMode },
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{ "Ts", PDFPageContentProcessor::Operator::TextSetRise },
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// Text positioning: Td, TD, Tm, T*
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{ "Td", PDFPageContentProcessor::Operator::TextMoveByOffset },
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{ "TD", PDFPageContentProcessor::Operator::TextSetLeadingAndMoveByOffset },
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{ "Tm", PDFPageContentProcessor::Operator::TextSetMatrix },
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{ "T*", PDFPageContentProcessor::Operator::TextMoveByLeading },
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// Text showing: Tj, TJ, ', "
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{ "Tj", PDFPageContentProcessor::Operator::TextShowTextString },
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{ "TJ", PDFPageContentProcessor::Operator::TextShowTextIndividualSpacing },
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{ "'", PDFPageContentProcessor::Operator::TextNextLineShowText },
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{ "\"", PDFPageContentProcessor::Operator::TextSetSpacingAndShowText },
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// Type 3 font: d0, d1
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{ "d0", PDFPageContentProcessor::Operator::Type3FontSetOffset },
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{ "d1", PDFPageContentProcessor::Operator::Type3FontSetOffsetAndBB },
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// Color: CS, cs, SC, SCN, sc, scn, G, g, RG, rg, K, k
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{ "CS", PDFPageContentProcessor::Operator::ColorSetStrokingColorSpace },
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{ "cs", PDFPageContentProcessor::Operator::ColorSetFillingColorSpace },
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{ "SC", PDFPageContentProcessor::Operator::ColorSetStrokingColor },
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{ "SCN", PDFPageContentProcessor::Operator::ColorSetStrokingColorN },
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{ "sc", PDFPageContentProcessor::Operator::ColorSetFillingColor },
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{ "scn", PDFPageContentProcessor::Operator::ColorSetFillingColorN },
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{ "G", PDFPageContentProcessor::Operator::ColorSetDeviceGrayStroking },
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{ "g", PDFPageContentProcessor::Operator::ColorSetDeviceGrayFilling },
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{ "RG", PDFPageContentProcessor::Operator::ColorSetDeviceRGBStroking },
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{ "rg", PDFPageContentProcessor::Operator::ColorSetDeviceRGBFilling },
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{ "K", PDFPageContentProcessor::Operator::ColorSetDeviceCMYKStroking },
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{ "k", PDFPageContentProcessor::Operator::ColorSetDeviceCMYKFilling },
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// Shading pattern: sh
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{ "sh", PDFPageContentProcessor::Operator::ShadingPaintShape },
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// Inline images: BI, ID, EI
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{ "BI", PDFPageContentProcessor::Operator::InlineImageBegin },
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{ "ID", PDFPageContentProcessor::Operator::InlineImageData },
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{ "EI", PDFPageContentProcessor::Operator::InlineImageEnd },
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// XObject: Do
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{ "Do", PDFPageContentProcessor::Operator::PaintXObject },
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// Marked content: MP, DP, BMC, BDC, EMC
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{ "MP", PDFPageContentProcessor::Operator::MarkedContentPoint },
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{ "DP", PDFPageContentProcessor::Operator::MarkedContentPointWithProperties },
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{ "BMC", PDFPageContentProcessor::Operator::MarkedContentBegin },
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{ "BDC", PDFPageContentProcessor::Operator::MarkedContentBeginWithProperties },
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{ "EMC", PDFPageContentProcessor::Operator::MarkedContentEnd },
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// Compatibility: BX, EX
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{ "BX", PDFPageContentProcessor::Operator::CompatibilityBegin },
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{ "EX", PDFPageContentProcessor::Operator::CompatibilityEnd }
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};
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PDFRenderer::PDFRenderer(const PDFDocument* document) :
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m_document(document),
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@ -80,44 +188,45 @@ QList<PDFRenderError> PDFPageContentProcessor::processContents()
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{
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const PDFObject& contents = m_page->getContents();
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// Clear the old errors
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m_errorList.clear();
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if (contents.isArray())
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{
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const PDFArray* array = contents.getArray();
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const size_t count = array->getCount();
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QList<PDFRenderError> errors;
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for (size_t i = 0; i < count; ++i)
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{
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const PDFObject& streamObject = m_document->getObject(array->getItem(i));
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if (streamObject.isStream())
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{
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errors.append(processContentStream(streamObject.getStream()));
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processContentStream(streamObject.getStream());
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}
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else
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{
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errors.append(PDFRenderError(RenderErrorType::Error, PDFTranslationContext::tr("Invalid page contents.")));
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m_errorList.append(PDFRenderError(RenderErrorType::Error, PDFTranslationContext::tr("Invalid page contents.")));
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}
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}
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return std::move(errors);
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}
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else if (contents.isStream())
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{
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return processContentStream(contents.getStream());
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processContentStream(contents.getStream());
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}
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else
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{
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return { PDFRenderError(RenderErrorType::Error, PDFTranslationContext::tr("Invalid page contents.")) };
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m_errorList.append(PDFRenderError(RenderErrorType::Error, PDFTranslationContext::tr("Invalid page contents.")));
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}
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return m_errorList;
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}
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QList<PDFRenderError> PDFPageContentProcessor::processContentStream(const PDFStream* stream)
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void PDFPageContentProcessor::processContentStream(const PDFStream* stream)
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{
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QByteArray content = m_document->getDecodedStream(stream);
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PDFLexicalAnalyzer parser(content.constBegin(), content.constEnd());
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QList<PDFRenderError> errors;
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while (!parser.isAtEnd())
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{
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try
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@ -128,7 +237,7 @@ QList<PDFRenderError> PDFPageContentProcessor::processContentStream(const PDFStr
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case PDFLexicalAnalyzer::TokenType::Command:
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{
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// Process the command, then clear the operand stack
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processCommand(token.data.toByteArray(), errors);
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processCommand(token.data.toByteArray());
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m_operands.clear();
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break;
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}
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@ -149,11 +258,167 @@ QList<PDFRenderError> PDFPageContentProcessor::processContentStream(const PDFStr
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}
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catch (PDFParserException exception)
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{
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errors.append(PDFRenderError(RenderErrorType::Error, exception.getMessage()));
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m_errorList.append(PDFRenderError(RenderErrorType::Error, exception.getMessage()));
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}
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catch (PDFRendererException exception)
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{
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m_errorList.append(exception.getError());
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}
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}
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}
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void PDFPageContentProcessor::processCommand(const QByteArray& command)
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{
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Operator op = Operator::Invalid;
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// Find the command in the command array
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for (const std::pair<const char*, PDFPageContentProcessor::Operator>& operatorDescriptor : operators)
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{
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if (command == operatorDescriptor.first)
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{
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op = operatorDescriptor.second;
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break;
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}
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}
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return errors;
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switch (op)
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{
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case Operator::MoveCurrentPoint:
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{
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invokeOperator(&PDFPageContentProcessor::operatorMoveCurrentPoint);
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break;
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}
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case Operator::LineTo:
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{
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invokeOperator(&PDFPageContentProcessor::operatorLineTo);
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break;
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}
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case Operator::Bezier123To:
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{
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invokeOperator(&PDFPageContentProcessor::operatorBezier123To);
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break;
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}
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case Operator::Bezier23To:
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{
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invokeOperator(&PDFPageContentProcessor::operatorBezier23To);
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break;
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}
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case Operator::Bezier13To:
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{
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invokeOperator(&PDFPageContentProcessor::operatorBezier13To);
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break;
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}
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case Operator::EndSubpath:
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{
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// Call directly, no parameters involved
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operatorEndSubpath();
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break;
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}
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case Operator::Rectangle:
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{
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invokeOperator(&PDFPageContentProcessor::operatorRectangle);
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break;
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}
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case Operator::Invalid:
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{
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m_errorList.append(PDFRenderError(RenderErrorType::Error, PDFTranslationContext::tr("Unknown operator '%1'.").arg(QString::fromLatin1(command))));
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break;
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}
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default:
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{
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m_errorList.append(PDFRenderError(RenderErrorType::NotImplemented, PDFTranslationContext::tr("Not implemented operator '%1'.").arg(QString::fromLatin1(command))));
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break;
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}
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}
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}
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QPointF PDFPageContentProcessor::getCurrentPoint() const
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{
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const int elementCount = m_currentPath.elementCount();
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if (elementCount > 0)
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{
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QPainterPath::Element element = m_currentPath.elementAt(elementCount - 1);
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return QPointF(element.x, element.y);
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}
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else
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{
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throw PDFRendererException(RenderErrorType::Error, PDFTranslationContext::tr("Current point of path is not set. Path is empty."));
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}
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return QPointF();
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}
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template<>
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PDFReal PDFPageContentProcessor::readOperand<PDFReal>(size_t index) const
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{
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if (m_operands.size() < index)
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{
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const PDFLexicalAnalyzer::Token& token = m_operands[index];
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switch (token.type)
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{
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case PDFLexicalAnalyzer::TokenType::Real:
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case PDFLexicalAnalyzer::TokenType::Integer:
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return token.data.value<PDFReal>();
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default:
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throw PDFRendererException(RenderErrorType::Error, PDFTranslationContext::tr("Can't read operand (real number) on index %1. Operand is of type '%2'.").arg(index + 1).arg(PDFLexicalAnalyzer::getStringFromOperandType(token.type)));
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}
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}
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else
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{
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throw PDFRendererException(RenderErrorType::Error, PDFTranslationContext::tr("Can't read operand (real number) on index %1. Only %2 operands provided.").arg(index + 1).arg(m_operands.size()));
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}
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return 0.0;
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}
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void PDFPageContentProcessor::operatorMoveCurrentPoint(PDFReal x, PDFReal y)
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{
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m_currentPath.moveTo(x, y);;
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}
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void PDFPageContentProcessor::operatorLineTo(PDFReal x, PDFReal y)
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{
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m_currentPath.lineTo(x, y);
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}
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void PDFPageContentProcessor::operatorBezier123To(PDFReal x1, PDFReal y1, PDFReal x2, PDFReal y2, PDFReal x3, PDFReal y3)
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{
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m_currentPath.cubicTo(x1, y1, x2, y2, x3, y3);
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}
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void PDFPageContentProcessor::operatorBezier23To(PDFReal x2, PDFReal y2, PDFReal x3, PDFReal y3)
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{
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QPointF currentPoint = getCurrentPoint();
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m_currentPath.cubicTo(currentPoint.x(), currentPoint.y(), x2, y2, x3, y3);
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}
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void PDFPageContentProcessor::operatorBezier13To(PDFReal x1, PDFReal y1, PDFReal x3, PDFReal y3)
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{
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m_currentPath.cubicTo(x1, y1, x3, y3, x3, y3);
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}
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void PDFPageContentProcessor::operatorEndSubpath()
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{
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m_currentPath.closeSubpath();
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}
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void PDFPageContentProcessor::operatorRectangle(PDFReal x, PDFReal y, PDFReal width, PDFReal height)
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{
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if (width < 0 || height < 0)
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{
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throw PDFRendererException(RenderErrorType::Error, PDFTranslationContext::tr("Invalid size of rectangle (%1 x %2).").arg(width).arg(height));
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}
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m_currentPath.addRect(QRectF(x, y, width, height));
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}
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PDFPageContentProcessor::PDFPageContentProcessorState::PDFPageContentProcessorState() :
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