mirror of https://github.com/JakubMelka/PDF4QT.git
1013 lines
50 KiB
C++
1013 lines
50 KiB
C++
// Copyright (C) 2019-2020 Jakub Melka
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//
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// This file is part of PdfForQt.
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//
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// PdfForQt is free software: you can redistribute it and/or modify
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// it under the terms of the GNU Lesser General Public License as published by
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// the Free Software Foundation, either version 3 of the License, or
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// (at your option) any later version.
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//
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// PdfForQt is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU Lesser General Public License for more details.
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//
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// You should have received a copy of the GNU Lesser General Public License
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// along with PDFForQt. If not, see <https://www.gnu.org/licenses/>.
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#ifndef PDFPAGECONTENTPROCESSOR_H
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#define PDFPAGECONTENTPROCESSOR_H
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#include "pdfrenderer.h"
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#include "pdfcolorspaces.h"
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#include "pdfparser.h"
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#include "pdffont.h"
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#include "pdfutils.h"
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#include "pdfmeshqualitysettings.h"
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#include "pdfblendfunction.h"
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#include "pdftextlayout.h"
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#include <QMatrix>
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#include <QPainterPath>
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#include <QSharedPointer>
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#include <stack>
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#include <tuple>
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#include <type_traits>
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namespace pdf
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{
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class PDFCMS;
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class PDFMesh;
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class PDFTilingPattern;
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class PDFOptionalContentActivity;
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static constexpr const char* PDF_RESOURCE_EXTGSTATE = "ExtGState";
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class PDFLineDashPattern
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{
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public:
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explicit inline PDFLineDashPattern() = default;
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explicit PDFLineDashPattern(const std::vector<PDFReal>& dashArray, PDFReal dashOffset);
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inline const std::vector<PDFReal>& getDashArray() const { return m_dashArray; }
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inline void setDashArray(const std::vector<PDFReal>& dashArray) { m_dashArray = dashArray; }
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inline PDFReal getDashOffset() const { return m_dashOffset; }
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inline void setDashOffset(PDFReal dashOffset) { m_dashOffset = dashOffset; }
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inline bool operator==(const PDFLineDashPattern& other) const { return m_dashArray == other.m_dashArray && m_dashOffset == other.m_dashOffset; }
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inline bool operator!=(const PDFLineDashPattern& other) const { return !(*this == other); }
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/// Is line solid? Function returns true, if yes.
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bool isSolid() const { return m_dashArray.empty(); }
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/// Fix line dash pattern according to the specification
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void fix();
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private:
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std::vector<PDFReal> m_dashArray;
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PDFReal m_dashOffset = 0.0;
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};
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/// Process the contents of the page.
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class PDFFORQTLIBSHARED_EXPORT PDFPageContentProcessor : public PDFRenderErrorReporter
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{
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public:
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explicit PDFPageContentProcessor(const PDFPage* page,
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const PDFDocument* document,
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const PDFFontCache* fontCache,
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const PDFCMS* CMS,
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const PDFOptionalContentActivity* optionalContentActivity,
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QMatrix pagePointToDevicePointMatrix,
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const PDFMeshQualitySettings& meshQualitySettings);
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virtual ~PDFPageContentProcessor();
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enum class Operator
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{
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// General graphic state w, J, j, M, d, ri, i, gs
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SetLineWidth, ///< w, sets the line width
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SetLineCap, ///< J, sets the line cap
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SetLineJoin, ///< j, sets the line join
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SetMitterLimit, ///< M, sets the mitter limit
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SetLineDashPattern, ///< d, sets the line dash pattern
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SetRenderingIntent, ///< ri, sets the rendering intent
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SetFlatness, ///< i, sets the flattness (number in range from 0 to 100)
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SetGraphicState, ///< gs, sets the whole graphic state (stored in resource dictionary)
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// Special graphic state: q, Q, cm
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SaveGraphicState, ///< q, saves the graphic state
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RestoreGraphicState, ///< Q, restores the graphic state
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AdjustCurrentTransformationMatrix, ///< cm, modify the current transformation matrix by matrix multiplication
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// Path construction: m, l, c, v, y, h, re
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MoveCurrentPoint, ///< m, begin a new subpath by moving to the desired point
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LineTo, ///< l, appends a straight line segment to the subpath
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Bezier123To, ///< c, appends a Bézier curve with control points 1, 2, 3
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Bezier23To, ///< v, appends a Bézier curve with control points 2, 3
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Bezier13To, ///< y, appends a Bézier curve with control points 1, 3
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EndSubpath, ///< h, ends current subpath by adding straight line segment from the last point to the beginning
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Rectangle, ///< re, adds rectangle
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// Path painting: S, s, f, F, f*, B, B*, b, b*, n
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PathStroke, ///< S, Stroke
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PathCloseStroke, ///< s, Close, Stroke (equivalent of operators h S)
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PathFillWinding, ///< f, Fill, Winding
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PathFillWinding2, ///< F, same as previous, see PDF Reference 1.7, Table 4.10
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PathFillEvenOdd, ///< f*, Fill, Even-Odd
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PathFillStrokeWinding, ///< B, Fill, Stroke, Winding
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PathFillStrokeEvenOdd, ///< B*, Fill, Stroke, Even-Odd
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PathCloseFillStrokeWinding, ///< b, Close, Fill, Stroke, Winding (equivalent of operators h B)
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PathCloseFillStrokeEvenOdd, ///< b*, Close, Fill, Stroke, Even-Odd (equivalent of operators h B*)
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PathClear, ///< n, clear path (close current) path, "no-operation", used with clipping
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// Clipping paths: W, W*
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ClipWinding, ///< W, modify current clipping path by intersecting it with current path using "Non zero winding number rule"
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ClipEvenOdd, ///< W*, modify current clipping path by intersecting it with current path using "Even-odd rule"
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// Text object: BT, ET
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TextBegin, ///< BT, begin text object, initialize text matrices, cannot be nested
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TextEnd, ///< ET, end text object, cannot be nested
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// Text state: Tc, Tw, Tz, TL, Tf, Tr, Ts
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TextSetCharacterSpacing, ///< Tc, set text character spacing
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TextSetWordSpacing, ///< Tw, set text word spacing
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TextSetHorizontalScale, ///< Tz, set text horizontal scaling (in percents, 100% = normal scaling)
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TextSetLeading, ///< TL, set text leading
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TextSetFontAndFontSize, ///< Tf, set text font (name from dictionary) and its size
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TextSetRenderMode, ///< Tr, set text render mode
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TextSetRise, ///< Ts, set text rise
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// Text positioning: Td, TD, Tm, T*
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TextMoveByOffset, ///< Td, move by offset
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TextSetLeadingAndMoveByOffset, ///< TD, sets text leading and moves by offset, x y TD is equivalent to sequence -y TL x y Td
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TextSetMatrix, ///< Tm, set text matrix
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TextMoveByLeading, ///< T*, moves text by leading, equivalent to 0 leading Td
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// Text showing: Tj, TJ, ', "
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TextShowTextString, ///< Tj, show text string
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TextShowTextIndividualSpacing, ///< TJ, show text, allow individual text spacing
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TextNextLineShowText, ///< ', move to the next line and show text ("string '" is equivalent to "T* string Tj")
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TextSetSpacingAndShowText, ///< ", move to the next line, set spacing and show text (equivalent to sequence "w1 Tw w2 Tc string '")
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// Type 3 font: d0, d1
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Type3FontSetOffset, ///< d0, set width information, see PDF 1.7 Reference, Table 5.10
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Type3FontSetOffsetAndBB, ///< d1, set offset and glyph bounding box
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// Color: CS, cs, SC, SCN, sc, scn, G, g, RG, rg, K, k
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ColorSetStrokingColorSpace, ///< CS, set current color space for stroking operations
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ColorSetFillingColorSpace, ///< cs, set current color space for filling operations
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ColorSetStrokingColor, ///< SC, set current stroking color
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ColorSetStrokingColorN, ///< SCN, same as SC, but also supports Pattern, Separation, DeviceN and ICCBased color spaces
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ColorSetFillingColor, ///< sc, set current filling color
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ColorSetFillingColorN, ///< scn, same as sc, but also supports Pattern, Separation, DeviceN and ICCBased color spaces
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ColorSetDeviceGrayStroking, ///< G, set DeviceGray color space for stroking color and set color
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ColorSetDeviceGrayFilling, ///< g, set DeviceGray color space for filling color and set color
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ColorSetDeviceRGBStroking, ///< RG, set DeviceRGB color space for stroking color and set color
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ColorSetDeviceRGBFilling, ///< rg, set DeviceRGB color space for filling color and set color
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ColorSetDeviceCMYKStroking, ///< K, set DeviceCMYK color space for stroking color and set color
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ColorSetDeviceCMYKFilling, ///< k, set DeviceCMYK color space for filling color and set color
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// Shading pattern: sh
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ShadingPaintShape, ///< sh, paint shape
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// Inline images: BI, ID, EI
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InlineImageBegin, ///< BI, begin inline image
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InlineImageData, ///< ID, inline image data
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InlineImageEnd, ///< EI, end of inline image
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// XObject: Do
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PaintXObject, ///< Do, paint the X Object (image, form, ...)
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// Marked content: MP, DP, BMC, BDC, EMC
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MarkedContentPoint, ///< MP, marked content point
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MarkedContentPointWithProperties, ///< DP, marked content point with properties
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MarkedContentBegin, ///< BMC, begin of sequence of marked content
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MarkedContentBeginWithProperties, ///< BDC, begin of sequence of marked content with properties
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MarkedContentEnd, ///< EMC, end of marked content sequence
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// Compatibility: BX, EX
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CompatibilityBegin, ///< BX, Compatibility mode begin (unrecognized operators are ignored)
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CompatibilityEnd, ///< EX, Compatibility mode end
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Invalid ///< Invalid operator, use for error reporting
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};
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enum ProcedureSet
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{
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EmptyProcSet = 0x0000,
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NoProcSet = 0x0001,
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PDF = 0x0002,
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Text = 0x0004,
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ImageB = 0x0008,
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ImageC = 0x0010,
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ImageI = 0x0020
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};
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Q_DECLARE_FLAGS(ProcedureSets, ProcedureSet)
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/// Process the contents of the page
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QList<PDFRenderError> processContents();
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virtual void reportRenderError(RenderErrorType type, QString message) override;
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/// Reports render error, but only once - if same error was already reported,
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/// then no new error is reported.
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virtual void reportRenderErrorOnce(RenderErrorType type, QString message) override;
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/// Processes form (XObject of type form)
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/// \param Matrix Transformation matrix from form coordinate system to page coordinate system
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/// \param boundingBox Bounding box, to which is drawed content clipped
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/// \param resources Resources, assigned to the form
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/// \param transparencyGroup Transparency group object
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/// \param content Content stream of the form
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/// \param formStructuralParent Structural parent key for form
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void processForm(const QMatrix& matrix,
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const QRectF& boundingBox,
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const PDFObject& resources,
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const PDFObject& transparencyGroup,
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const QByteArray& content,
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PDFInteger formStructuralParent);
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/// Initialize stream processor for processing content streams. For example,
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/// graphic state is initialized to default, and default color spaces are initialized.
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void initializeProcessor();
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/// Computes visibility of OCG/OCMD - returns false, if it is not suppressed,
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/// or true, if it is suppressed.
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virtual bool isContentSuppressedByOC(PDFObjectReference ocgOrOcmd);
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protected:
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struct PDFTransparencyGroup
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{
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PDFColorSpacePointer colorSpacePointer;
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bool isolated = false;
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bool knockout = false;
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};
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struct PDFOverprintMode
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{
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bool overprintStroking = false;
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bool overprintFilling = false;
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int overprintMode = 0;
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inline bool operator==(const PDFOverprintMode& other) const
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{
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return std::tie(overprintStroking, overprintFilling, overprintMode) == std::tie(other.overprintStroking, other.overprintFilling, other.overprintMode);
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}
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inline bool operator!=(const PDFOverprintMode& other) const
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{
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return !(*this == other);
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}
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};
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/// Represents graphic state of the PDF (holding current graphic state parameters).
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/// Please see PDF Reference 1.7, Chapter 4.3 "Graphic State"
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class PDFPageContentProcessorState
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{
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public:
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explicit PDFPageContentProcessorState();
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~PDFPageContentProcessorState();
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PDFPageContentProcessorState(const PDFPageContentProcessorState&) = default;
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PDFPageContentProcessorState(PDFPageContentProcessorState&&) = default;
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PDFPageContentProcessorState& operator=(PDFPageContentProcessorState&&) = delete;
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PDFPageContentProcessorState& operator=(const PDFPageContentProcessorState& other);
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enum StateFlag : uint64_t
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{
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StateUnchanged = 0x0000000000000000,
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StateCurrentTransformationMatrix = 0x0000000000000001,
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StateStrokeColorSpace = 0x0000000000000002,
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StateFillColorSpace = 0x0000000000000004,
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StateStrokeColor = 0x0000000000000008,
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StateFillColor = 0x0000000000000010,
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StateLineWidth = 0x0000000000000020,
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StateLineCapStyle = 0x0000000000000040,
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StateLineJoinStyle = 0x0000000000000080,
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StateMitterLimit = 0x0000000000000100,
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StateLineDashPattern = 0x0000000000000200,
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StateRenderingIntentName = 0x0000000000000400,
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StateFlatness = 0x0000000000000800,
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StateSmoothness = 0x0000000000001000,
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StateTextMatrix = 0x0000000000002000,
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StateTextLineMatrix = 0x0000000000004000,
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StateTextCharacterSpacing = 0x0000000000008000,
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StateTextWordSpacing = 0x0000000000010000,
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StateTextHorizontalScaling = 0x0000000000020000,
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StateTextLeading = 0x0000000000040000,
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StateTextFont = 0x0000000000080000,
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StateTextFontSize = 0x0000000000100000,
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StateTextRenderingMode = 0x0000000000200000,
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StateTextRise = 0x0000000000400000,
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StateTextKnockout = 0x0000000000800000,
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StateAlphaStroking = 0x0000000001000000,
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StateAlphaFilling = 0x0000000002000000,
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StateBlendMode = 0x0000000004000000,
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StateRenderingIntent = 0x0000000008000000,
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StateOverprint = 0x0000000010000000,
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StateAlphaIsShape = 0x0000000020000000,
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StateStrokeAdjustment = 0x0000000040000000,
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StateSoftMask = 0x0000000080000000,
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StateBlackPointCompensation = 0x0000000100000000,
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StateBlackGenerationFunction = 0x0000000200000000,
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StateUndercolorRemovalFunction = 0x0000000400000000,
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StateTransferFunction = 0x0000000800000000,
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StateHalftone = 0x0000001000000000,
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StateHalftoneOrigin = 0x0000002000000000,
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StateAll = 0xFFFFFFFFFFFFFFFF
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};
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using StateFlags = PDFFlags<StateFlag>;
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const QMatrix& getCurrentTransformationMatrix() const { return m_currentTransformationMatrix; }
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void setCurrentTransformationMatrix(const QMatrix& currentTransformationMatrix);
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const PDFAbstractColorSpace* getStrokeColorSpace() const { return m_strokeColorSpace.data(); }
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void setStrokeColorSpace(const QSharedPointer<PDFAbstractColorSpace>& strokeColorSpace);
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const PDFAbstractColorSpace* getFillColorSpace() const { return m_fillColorSpace.data(); }
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void setFillColorSpace(const QSharedPointer<PDFAbstractColorSpace>& fillColorSpace);
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const QColor& getStrokeColor() const { return m_strokeColor; }
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void setStrokeColor(const QColor& strokeColor);
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const QColor& getFillColor() const { return m_fillColor; }
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void setFillColor(const QColor& fillColor);
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PDFReal getLineWidth() const { return m_lineWidth; }
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void setLineWidth(PDFReal lineWidth);
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Qt::PenCapStyle getLineCapStyle() const { return m_lineCapStyle; }
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void setLineCapStyle(Qt::PenCapStyle lineCapStyle);
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Qt::PenJoinStyle getLineJoinStyle() const { return m_lineJoinStyle; }
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void setLineJoinStyle(Qt::PenJoinStyle lineJoinStyle);
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PDFReal getMitterLimit() const { return m_mitterLimit; }
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void setMitterLimit(PDFReal mitterLimit);
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const PDFLineDashPattern& getLineDashPattern() const { return m_lineDashPattern; }
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void setLineDashPattern(PDFLineDashPattern pattern);
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const QByteArray& getRenderingIntentName() const { return m_renderingIntentName; }
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void setRenderingIntentName(const QByteArray& renderingIntentName);
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PDFReal getFlatness() const { return m_flatness; }
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void setFlatness(PDFReal flatness);
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PDFReal getSmoothness() const { return m_smoothness; }
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void setSmoothness(PDFReal smoothness);
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StateFlags getStateFlags() const { return m_stateFlags; }
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void setStateFlags(StateFlags stateFlags) { m_stateFlags = stateFlags; }
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PDFReal getTextCharacterSpacing() const { return m_textCharacterSpacing; }
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void setTextCharacterSpacing(PDFReal textCharacterSpacing);
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PDFReal getTextWordSpacing() const { return m_textWordSpacing; }
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void setTextWordSpacing(PDFReal textWordSpacing);
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PDFReal getTextHorizontalScaling() const { return m_textHorizontalScaling; }
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void setTextHorizontalScaling(PDFReal textHorizontalScaling);
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PDFReal getTextLeading() const { return m_textLeading; }
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void setTextLeading(PDFReal textLeading);
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const PDFFontPointer& getTextFont() const { return m_textFont; }
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void setTextFont(const PDFFontPointer& textFont);
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PDFReal getTextFontSize() const { return m_textFontSize; }
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void setTextFontSize(PDFReal textFontSize);
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TextRenderingMode getTextRenderingMode() const { return m_textRenderingMode; }
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void setTextRenderingMode(TextRenderingMode textRenderingMode);
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PDFReal getTextRise() const { return m_textRise; }
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void setTextRise(PDFReal textRise);
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bool getTextKnockout() const { return m_textKnockout; }
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void setTextKnockout(bool textKnockout);
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const QMatrix& getTextMatrix() const { return m_textMatrix; }
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void setTextMatrix(const QMatrix& textMatrix);
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const QMatrix& getTextLineMatrix() const { return m_textLineMatrix; }
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void setTextLineMatrix(const QMatrix& textLineMatrix);
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PDFReal getAlphaStroking() const { return m_alphaStroking; }
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void setAlphaStroking(PDFReal alpha);
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PDFReal getAlphaFilling() const { return m_alphaFilling; }
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void setAlphaFilling(PDFReal alpha);
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BlendMode getBlendMode() const { return m_blendMode; }
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void setBlendMode(BlendMode mode);
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RenderingIntent getRenderingIntent() const { return m_renderingIntent; }
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void setRenderingIntent(RenderingIntent renderingIntent);
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/// Returns stroke color with alpha channel
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QColor getStrokeColorWithAlpha() const;
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/// Returns fill color with alpha channel
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QColor getFillColorWithAlpha() const;
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PDFOverprintMode getOverprintMode() const { return m_overprintMode; }
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void setOverprintMode(PDFOverprintMode overprintMode);
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bool getAlphaIsShape() const { return m_alphaIsShape; }
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void setAlphaIsShape(bool alphaIsShape);
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bool getStrokeAdjustment() const;
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void setStrokeAdjustment(bool strokeAdjustment);
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const PDFDictionary* getSoftMask() const;
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void setSoftMask(const PDFDictionary* softMask);
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BlackPointCompensationMode getBlackPointCompensationMode() const;
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void setBlackPointCompensationMode(BlackPointCompensationMode blackPointCompensationMode);
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PDFObject getBlackGenerationFunction() const;
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void setBlackGenerationFunction(const PDFObject& blackGenerationFunction);
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PDFObject getUndercolorRemovalFunction() const;
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void setUndercolorRemovalFunction(const PDFObject& undercolorRemovalFunction);
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PDFObject getTransferFunction() const;
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void setTransferFunction(const PDFObject& transferFunction);
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PDFObject getHalftone() const;
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void setHalftone(const PDFObject& halftone);
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QPointF getHalftoneOrigin() const;
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void setHalftoneOrigin(const QPointF& halftoneOrigin);
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private:
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QMatrix m_currentTransformationMatrix;
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PDFColorSpacePointer m_strokeColorSpace;
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PDFColorSpacePointer m_fillColorSpace;
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QColor m_strokeColor;
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QColor m_fillColor;
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PDFReal m_lineWidth;
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Qt::PenCapStyle m_lineCapStyle;
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Qt::PenJoinStyle m_lineJoinStyle;
|
|
PDFReal m_mitterLimit;
|
|
PDFLineDashPattern m_lineDashPattern;
|
|
QByteArray m_renderingIntentName;
|
|
PDFReal m_flatness;
|
|
PDFReal m_smoothness;
|
|
PDFReal m_textCharacterSpacing; // T_c
|
|
PDFReal m_textWordSpacing; // T_w
|
|
PDFReal m_textHorizontalScaling; // T_h, percentage
|
|
PDFReal m_textLeading; // T_l
|
|
PDFFontPointer m_textFont; // Text font
|
|
PDFReal m_textFontSize; // T_fs
|
|
TextRenderingMode m_textRenderingMode; // Text rendering mode
|
|
PDFReal m_textRise; // T_rise
|
|
bool m_textKnockout;
|
|
QMatrix m_textMatrix;
|
|
QMatrix m_textLineMatrix;
|
|
PDFReal m_alphaStroking;
|
|
PDFReal m_alphaFilling;
|
|
BlendMode m_blendMode;
|
|
RenderingIntent m_renderingIntent;
|
|
PDFOverprintMode m_overprintMode;
|
|
bool m_alphaIsShape;
|
|
bool m_strokeAdjustment;
|
|
const PDFDictionary* m_softMask;
|
|
BlackPointCompensationMode m_blackPointCompensationMode;
|
|
PDFObject m_blackGenerationFunction;
|
|
PDFObject m_undercolorRemovalFunction;
|
|
PDFObject m_transferFunction;
|
|
PDFObject m_halftone;
|
|
QPointF m_halftoneOrigin;
|
|
StateFlags m_stateFlags;
|
|
};
|
|
|
|
enum class ProcessOrder
|
|
{
|
|
BeforeOperation,
|
|
AfterOperation
|
|
};
|
|
|
|
/// This function has to be implemented in the client drawing implementation, it should
|
|
/// draw the path according to the parameters.
|
|
/// \param path Path, which should be drawn (can be emtpy - in that case nothing happens)
|
|
/// \param stroke Stroke the path
|
|
/// \param fill Fill the path using given rule
|
|
/// \param text Is text being drawn?
|
|
/// \param fillRule Fill rule used in the fill mode
|
|
virtual void performPathPainting(const QPainterPath& path, bool stroke, bool fill, bool text, Qt::FillRule fillRule);
|
|
|
|
/// This function has to be implemented in the client drawing implementation, it should
|
|
/// clip along the path (intersect with current clipping path).
|
|
virtual void performClipping(const QPainterPath& path, Qt::FillRule fillRule);
|
|
|
|
/// This function has to be implemented in the client drawing implementation, it should
|
|
/// draw the image.
|
|
/// \param image Image to be painted
|
|
virtual void performImagePainting(const QImage& image);
|
|
|
|
/// This function has to be implemented in the client drawing implementation, it should
|
|
/// draw the mesh. Mesh is in device space coordinates (so world transformation matrix
|
|
/// is identity matrix).
|
|
/// \param mesh Mesh to be drawn
|
|
virtual void performMeshPainting(const PDFMesh& mesh);
|
|
|
|
/// This function has to be implemented in the client drawing implementation, it should
|
|
/// update the device according to the graphic state change. The flags are set when
|
|
/// the value differs from the previous graphic state.
|
|
virtual void performUpdateGraphicsState(const PDFPageContentProcessorState& state);
|
|
|
|
/// Implement to perform save of the graphic state. This function is called two times -
|
|
/// before the operation and after the operation. Parameter \p order determines when
|
|
/// this function is called.
|
|
/// \param order If this function is called before the operation, or after the operation.
|
|
virtual void performSaveGraphicState(ProcessOrder order);
|
|
|
|
/// Implement to perform restore of the graphic state. This function is called two times -
|
|
/// before the operation and after the operation. Parameter \p order determines when
|
|
/// this function is called.
|
|
/// \param order If this function is called before the operation, or after the operation.
|
|
virtual void performRestoreGraphicState(ProcessOrder order);
|
|
|
|
/// Implement to react on marked content point. Properties object can be null, in case
|
|
/// that no properties are provided.
|
|
/// \param tag Tag of the marked content point
|
|
/// \param properties Properties of the marked content point.
|
|
virtual void performMarkedContentPoint(const QByteArray& tag, const PDFObject& properties);
|
|
|
|
/// Implement to react on marked content begin.
|
|
/// \param tag Tag of the marked content point
|
|
/// \param properties Properties of the marked content point.
|
|
virtual void performMarkedContentBegin(const QByteArray& tag, const PDFObject& properties);
|
|
|
|
/// Implement to react on marked content end
|
|
virtual void performMarkedContentEnd();
|
|
|
|
/// Implement to react on set char width request
|
|
virtual void performSetCharWidth(PDFReal wx, PDFReal wy);
|
|
|
|
/// Implement to react on set cache device request
|
|
virtual void performSetCacheDevice(PDFReal wx, PDFReal wy, PDFReal llx, PDFReal lly, PDFReal urx, PDFReal ury);
|
|
|
|
/// Implement to begin new transparency group
|
|
/// \param Order, in which is function called (before/after setting new transparency group)
|
|
/// \param transparencyGroup Transparency group
|
|
virtual void performBeginTransparencyGroup(ProcessOrder order, const PDFTransparencyGroup& transparencyGroup);
|
|
|
|
/// Implement to end current transparency group
|
|
/// \param Order, in which is function called (before/after setting new transparency group)
|
|
/// \param transparencyGroup Transparency group
|
|
virtual void performEndTransparencyGroup(ProcessOrder order, const PDFTransparencyGroup& transparencyGroup);
|
|
|
|
/// Implement to react on character printing
|
|
virtual void performOutputCharacter(const PDFTextCharacterInfo& info);
|
|
|
|
enum class ContentKind
|
|
{
|
|
Shapes, ///< General shapes (they can be also shaded / tiled)
|
|
Text, ///< Text outlines (they can be also shaded / tiled)
|
|
Images, ///< Images
|
|
Shading, ///< Shading
|
|
Tiling, ///< Tiling
|
|
};
|
|
|
|
/// Override this function to disable particular content type (for example
|
|
/// shading, images, ...)
|
|
virtual bool isContentKindSuppressed(ContentKind kind) const;
|
|
|
|
/// Returns current structural parent key
|
|
PDFInteger getStructuralParentKey() const { return m_structuralParentKey; }
|
|
|
|
/// 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)); }
|
|
|
|
/// Returns true, if graphic content is suppressed
|
|
bool isContentSuppressed() const;
|
|
|
|
/// Returns page point to device point matrix
|
|
const QMatrix& getPagePointToDevicePointMatrix() const { return m_pagePointToDevicePointMatrix; }
|
|
|
|
/// Returns base matrix for patterns
|
|
const QMatrix& getPatternBaseMatrix() const { return m_patternBaseMatrix; }
|
|
|
|
/// Returns current world matrix (translating actual point to the device point)
|
|
QMatrix getCurrentWorldMatrix() const { return getGraphicState()->getCurrentTransformationMatrix() * m_pagePointToDevicePointMatrix; }
|
|
|
|
/// Returns page bounding rectangle in device space
|
|
const QRectF& getPageBoundingRectDeviceSpace() const { return m_pageBoundingRectDeviceSpace; }
|
|
|
|
/// Returns current procedure sets. Procedure sets are deprecated in PDF 2.0 and are here
|
|
/// only for compatibility purposes. See chapter 14.2 in PDF 2.0 specification.
|
|
ProcedureSets getProcedureSets() const { return m_procedureSets; }
|
|
|
|
private:
|
|
/// Initializes the resources dictionaries
|
|
void initDictionaries(const PDFObject& resourcesObject);
|
|
|
|
/// Process the content stream
|
|
void processContentStream(const PDFStream* stream);
|
|
|
|
/// Process the content
|
|
void processContent(const QByteArray& content);
|
|
|
|
/// Processes single command
|
|
void processCommand(const QByteArray& command);
|
|
|
|
/// Performs path painting
|
|
/// \param path Path, which should be drawn (can be emtpy - in that case nothing happens)
|
|
/// \param stroke Stroke the path
|
|
/// \param fill Fill the path using given rule
|
|
/// \param text Is text being drawn?
|
|
/// \param fillRule Fill rule used in the fill mode
|
|
void processPathPainting(const QPainterPath& path, bool stroke, bool fill, bool text, Qt::FillRule fillRule);
|
|
|
|
/// Performs tiling pattern painting
|
|
/// \param tilingPattern Tiling pattern to be painted
|
|
/// \param path Clipping path
|
|
/// \param uncoloredPatternColorSpace Color space for uncolored color patterns
|
|
/// \param uncoloredPatternColor Uncolored color pattern color
|
|
void processTillingPatternPainting(const PDFTilingPattern* tilingPattern,
|
|
const QPainterPath& path,
|
|
PDFColorSpacePointer uncoloredPatternColorSpace,
|
|
PDFColor uncoloredPatternColor);
|
|
|
|
/// Applies graphic state dictionary
|
|
/// \param graphicStateDictionary Dictionary to be applied to the current graphic state
|
|
void processApplyGraphicState(const PDFDictionary* graphicStateDictionary);
|
|
|
|
enum class MarkedContentKind
|
|
{
|
|
OptionalContent,
|
|
Other
|
|
};
|
|
|
|
struct MarkedContentState
|
|
{
|
|
inline explicit MarkedContentState() = default;
|
|
inline explicit MarkedContentState(const QByteArray& tag, MarkedContentKind kind, bool contentSuppressed) :
|
|
tag(tag),
|
|
kind(kind),
|
|
contentSuppressed(contentSuppressed)
|
|
{
|
|
|
|
}
|
|
|
|
QByteArray tag;
|
|
MarkedContentKind kind = MarkedContentKind::Other;
|
|
bool contentSuppressed = false;
|
|
};
|
|
|
|
class PDFPageContentProcessorStateGuard
|
|
{
|
|
public:
|
|
explicit PDFPageContentProcessorStateGuard(PDFPageContentProcessor* processor);
|
|
~PDFPageContentProcessorStateGuard();
|
|
|
|
private:
|
|
PDFPageContentProcessor* m_processor;
|
|
|
|
// Stored resources
|
|
const PDFDictionary* m_colorSpaceDictionary;
|
|
const PDFDictionary* m_fontDictionary;
|
|
const PDFDictionary* m_xobjectDictionary;
|
|
const PDFDictionary* m_extendedGraphicStateDictionary;
|
|
const PDFDictionary* m_propertiesDictionary;
|
|
const PDFDictionary* m_shadingDictionary;
|
|
const PDFDictionary* m_patternDictionary;
|
|
ProcedureSets m_procedureSets;
|
|
};
|
|
|
|
class PDFPageContentProcessorGraphicStateSaveRestoreGuard
|
|
{
|
|
public:
|
|
inline explicit PDFPageContentProcessorGraphicStateSaveRestoreGuard(PDFPageContentProcessor* processor) :
|
|
m_processor(processor)
|
|
{
|
|
m_processor->operatorSaveGraphicState();
|
|
}
|
|
inline ~PDFPageContentProcessorGraphicStateSaveRestoreGuard()
|
|
{
|
|
m_processor->operatorRestoreGraphicState();
|
|
}
|
|
|
|
private:
|
|
PDFPageContentProcessor* m_processor;
|
|
};
|
|
|
|
class PDFTransparencyGroupGuard
|
|
{
|
|
public:
|
|
explicit PDFTransparencyGroupGuard(PDFPageContentProcessor* processor, PDFTransparencyGroup&& group);
|
|
~PDFTransparencyGroupGuard();
|
|
|
|
private:
|
|
PDFPageContentProcessor* m_processor;
|
|
};
|
|
|
|
/// Wrapper for PDF Name
|
|
struct PDFOperandName
|
|
{
|
|
QByteArray name;
|
|
};
|
|
|
|
/// Wrapper for PDF String
|
|
struct PDFOperandString
|
|
{
|
|
QByteArray string;
|
|
};
|
|
|
|
template<typename T>
|
|
T readOperand(size_t index) const;
|
|
|
|
template<>
|
|
PDFReal readOperand<PDFReal>(size_t index) const;
|
|
|
|
template<>
|
|
PDFInteger readOperand<PDFInteger>(size_t index) const;
|
|
|
|
template<>
|
|
PDFOperandName readOperand<PDFOperandName>(size_t index) const;
|
|
|
|
template<>
|
|
PDFOperandString readOperand<PDFOperandString>(size_t index) const;
|
|
|
|
template<size_t index, typename T>
|
|
inline T readOperand() const { return readOperand<T>(index); }
|
|
|
|
template<typename Tuple, class F, std::size_t... I>
|
|
inline void invokeOperatorImpl(F function, std::index_sequence<I...>)
|
|
{
|
|
(this->*function)(readOperand<I, typename std::tuple_element<I, Tuple>::type>()...);
|
|
}
|
|
|
|
/// Function invokes operator (function) with given arguments. For that reason, variadic
|
|
/// templates are used. Basically, for each argument of the function, we need type of the argument,
|
|
/// and its index. To retrieve it, we use std::tuple, variadic template and functionality
|
|
/// analogic to std::apply implementation.
|
|
template<typename... Operands>
|
|
inline void invokeOperator(void(PDFPageContentProcessor::* function)(Operands...))
|
|
{
|
|
invokeOperatorImpl<std::tuple<Operands...>>(function, std::make_index_sequence<std::tuple_size_v<std::remove_reference_t<std::tuple<Operands...>>>>{});
|
|
}
|
|
|
|
/// Returns the current poin in the path. If path doesn't exist, then
|
|
/// exception is thrown.
|
|
QPointF getCurrentPoint() const;
|
|
|
|
/// Notifies the updated graphic state. If nothing changed in graphic state, then nothing happens.
|
|
void updateGraphicState();
|
|
|
|
template<typename... Operands>
|
|
inline QColor getColorFromColorSpace(const PDFAbstractColorSpace* colorSpace, Operands... operands)
|
|
{
|
|
|
|
|
|
constexpr const size_t operandCount = sizeof...(Operands);
|
|
const size_t colorSpaceComponentCount = colorSpace->getColorComponentCount();
|
|
if (operandCount == colorSpaceComponentCount)
|
|
{
|
|
return colorSpace->getColor(PDFColor(static_cast<PDFColorComponent>(operands)...), m_CMS, m_graphicState.getRenderingIntent(), this, true);
|
|
}
|
|
else
|
|
{
|
|
throw PDFRendererException(RenderErrorType::Error, PDFTranslationContext::tr("Invalid color component count. Provided %1, required %2.").arg(operandCount).arg(colorSpaceComponentCount));
|
|
}
|
|
|
|
return QColor();
|
|
}
|
|
|
|
/// Converts PDF line cap to Qt's pen cap style. Function always succeeds,
|
|
/// if invalid \p lineCap occurs, then some valid pen cap style is returned.
|
|
/// \param lineCap PDF Line cap style (see PDF Reference 1.7, values can be 0, 1, and 2)
|
|
static Qt::PenCapStyle convertLineCapToPenCapStyle(PDFInteger lineCap);
|
|
|
|
/// Convers Qt's pen cap style to PDF's line cap style (defined in the PDF Reference)
|
|
/// \param penCapStyle Qt's pen cap style to be converted
|
|
static PDFInteger convertPenCapStyleToLineCap(Qt::PenCapStyle penCapStyle);
|
|
|
|
/// Converts PDF line join to Qt's pen join style. Function always succeeds,
|
|
/// if invalid \p lineJoin occurs, then some valid pen join style is returned.
|
|
/// \param lineJoin PDF Line join style (see PDF Reference 1.7, values can be 0, 1, and 2)
|
|
static Qt::PenJoinStyle convertLineJoinToPenJoinStyle(PDFInteger lineJoin);
|
|
|
|
/// Convers Qt's pen join style to PDF's line join style (defined in the PDF Reference)
|
|
/// \param penJoinStyle Qt's pen join style to be converted
|
|
static PDFInteger convertPenJoinStyleToLineJoin(Qt::PenJoinStyle penJoinStyle);
|
|
|
|
// General graphic state w, J, j, M, d, ri, i, gs
|
|
void operatorSetLineWidth(PDFReal lineWidth); ///< w, sets the line width
|
|
void operatorSetLineCap(PDFInteger lineCap); ///< J, sets the line cap
|
|
void operatorSetLineJoin(PDFInteger lineJoin); ///< j, sets the line join
|
|
void operatorSetMitterLimit(PDFReal mitterLimit); ///< M, sets the mitter limit
|
|
void operatorSetLineDashPattern(); ///< d, sets the line dash pattern
|
|
void operatorSetRenderingIntent(PDFOperandName intent); ///< ri, sets the rendering intent
|
|
void operatorSetFlatness(PDFReal flatness); ///< i, sets the flattness (number in range from 0 to 100)
|
|
void operatorSetGraphicState(PDFOperandName dictionaryName); ///< gs, sets the whole graphic state (stored in resource dictionary)
|
|
|
|
// Special graphic state: q, Q, cm
|
|
void operatorSaveGraphicState(); ///< q, saves the graphic state
|
|
void operatorRestoreGraphicState(); ///< Q, restores the graphic state
|
|
void operatorAdjustCurrentTransformationMatrix(PDFReal a, PDFReal b, PDFReal c, PDFReal d, PDFReal e, PDFReal f); ///< cm, modify the current transformation matrix by matrix multiplication
|
|
|
|
// Path construction operators
|
|
void operatorMoveCurrentPoint(PDFReal x, PDFReal y);
|
|
void operatorLineTo(PDFReal x, PDFReal y);
|
|
void operatorBezier123To(PDFReal x1, PDFReal y1, PDFReal x2, PDFReal y2, PDFReal x3, PDFReal y3);
|
|
void operatorBezier23To(PDFReal x2, PDFReal y2, PDFReal x3, PDFReal y3);
|
|
void operatorBezier13To(PDFReal x1, PDFReal y1, PDFReal x3, PDFReal y3);
|
|
void operatorEndSubpath();
|
|
void operatorRectangle(PDFReal x, PDFReal y, PDFReal width, PDFReal height);
|
|
|
|
// Path painting operators
|
|
void operatorPathStroke();
|
|
void operatorPathCloseStroke();
|
|
void operatorPathFillWinding();
|
|
void operatorPathFillEvenOdd();
|
|
void operatorPathFillStrokeWinding();
|
|
void operatorPathFillStrokeEvenOdd();
|
|
void operatorPathCloseFillStrokeWinding();
|
|
void operatorPathCloseFillStrokeEvenOdd();
|
|
void operatorPathClear();
|
|
|
|
// Clipping paths: W, W*
|
|
void operatorClipWinding(); ///< W, modify current clipping path by intersecting it with current path using "Non zero winding number rule"
|
|
void operatorClipEvenOdd(); ///< W*, modify current clipping path by intersecting it with current path using "Even-odd rule"
|
|
|
|
// Type 3 font: d0, d1
|
|
void operatorType3FontSetOffset(PDFReal wx, PDFReal wy); ///< d0, set width information, see PDF 1.7 Reference, Table 5.10
|
|
void operatorType3FontSetOffsetAndBB(PDFReal wx, PDFReal wy, PDFReal llx, PDFReal lly, PDFReal urx, PDFReal ury); ///< d1, set offset and glyph bounding box
|
|
|
|
// Color: CS, cs, SC, SCN, sc, scn, G, g, RG, rg, K, k
|
|
void operatorColorSetStrokingColorSpace(PDFOperandName name); ///< CS, set current color space for stroking operations
|
|
void operatorColorSetFillingColorSpace(PDFOperandName name); ///< cs, set current color space for filling operations
|
|
void operatorColorSetStrokingColor(); ///< SC, set current stroking color
|
|
void operatorColorSetStrokingColorN(); ///< SCN, same as SC, but also supports Pattern, Separation, DeviceN and ICCBased color spaces
|
|
void operatorColorSetFillingColor(); ///< sc, set current filling color
|
|
void operatorColorSetFillingColorN(); ///< scn, same as sc, but also supports Pattern, Separation, DeviceN and ICCBased color spaces
|
|
void operatorColorSetDeviceGrayStroking(PDFReal gray); ///< G, set DeviceGray color space for stroking color and set color
|
|
void operatorColorSetDeviceGrayFilling(PDFReal gray); ///< g, set DeviceGray color space for filling color and set color
|
|
void operatorColorSetDeviceRGBStroking(PDFReal r, PDFReal g, PDFReal b); ///< RG, set DeviceRGB color space for stroking color and set color
|
|
void operatorColorSetDeviceRGBFilling(PDFReal r, PDFReal g, PDFReal b); ///< rg, set DeviceRGB color space for filling color and set color
|
|
void operatorColorSetDeviceCMYKStroking(PDFReal c, PDFReal m, PDFReal y, PDFReal k); ///< K, set DeviceCMYK color space for stroking color and set color
|
|
void operatorColorSetDeviceCMYKFilling(PDFReal c, PDFReal m, PDFReal y, PDFReal k); ///< k, set DeviceCMYK color space for filling color and set color
|
|
|
|
// Text object: BT, ET
|
|
void operatorTextBegin(); ///< BT, begin text object, initialize text matrices, cannot be nested
|
|
void operatorTextEnd(); ///< ET, end text object, cannot be nested
|
|
|
|
// Text state: Tc, Tw, Tz, TL, Tf, Tr, Ts
|
|
void operatorTextSetCharacterSpacing(PDFReal charSpacing); ///< Tc, set text character spacing
|
|
void operatorTextSetWordSpacing(PDFReal wordSpacing); ///< Tw, set text word spacing
|
|
void operatorTextSetHorizontalScale(PDFReal horizontalScaling); ///< Tz, set text horizontal scaling (in percents, 100% = normal scaling)
|
|
void operatorTextSetLeading(PDFReal leading); ///< TL, set text leading
|
|
void operatorTextSetFontAndFontSize(PDFOperandName fontName, PDFReal fontSize); ///< Tf, set text font (name from dictionary) and its size
|
|
void operatorTextSetRenderMode(PDFInteger mode); ///< Tr, set text render mode
|
|
void operatorTextSetRise(PDFReal rise); ///< Ts, set text rise
|
|
|
|
// Text positioning: Td, TD, Tm, T*
|
|
void operatorTextMoveByOffset(PDFReal t_x, PDFReal t_y); ///< Td, move by offset
|
|
void operatorTextSetLeadingAndMoveByOffset(PDFReal t_x, PDFReal t_y); ///< TD, sets text leading and moves by offset, x y TD is equivalent to sequence -y TL x y Td
|
|
void operatorTextSetMatrix(PDFReal a, PDFReal b, PDFReal c, PDFReal d, PDFReal e, PDFReal f); ///< Tm, set text matrix
|
|
void operatorTextMoveByLeading(); ///< T*, moves text by leading, equivalent to 0 leading Td
|
|
|
|
// Text showing: Tj, TJ, ', "
|
|
void operatorTextShowTextString(PDFOperandString text); ///< Tj, show text string
|
|
void operatorTextShowTextIndividualSpacing(); ///< TJ, show text, allow individual text spacing
|
|
void operatorTextNextLineShowText(PDFOperandString text); ///< ', move to the next line and show text ("string '" is equivalent to "T* string Tj")
|
|
void operatorTextSetSpacingAndShowText(PDFReal t_w, PDFReal t_c, PDFOperandString text); ///< ", move to the next line, set spacing and show text (equivalent to sequence "w1 Tw w2 Tc string '")
|
|
|
|
// Shading pattern: sh
|
|
void operatorShadingPaintShape(PDFOperandName name); ///< sh, paint shape
|
|
|
|
// XObject: Do
|
|
void operatorPaintXObject(PDFOperandName name); ///< Do, paint the X Object (image, form, ...)
|
|
|
|
// Marked content: MP, DP, BMC, BDC, EMC
|
|
void operatorMarkedContentPoint(PDFOperandName name); ///< MP, marked content point
|
|
void operatorMarkedContentPointWithProperties(PDFOperandName name, PDFObject properties); ///< DP, marked content point with properties
|
|
void operatorMarkedContentBegin(PDFOperandName name); ///< BMC, begin of sequence of marked content
|
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void operatorMarkedContentBeginWithProperties(PDFOperandName name, PDFObject properties); ///< BDC, begin of sequence of marked content with properties
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void operatorMarkedContentEnd(); ///< EMC, end of marked content sequence
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// Compatibility: BX, EX
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void operatorCompatibilityBegin(); ///< BX, Compatibility mode begin (unrecognized operators are ignored)
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void operatorCompatibilityEnd(); ///< EX, Compatibility mode end
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// Draws the text using the text sequence
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void drawText(const TextSequence& textSequence);
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/// Returns realized font
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const PDFRealizedFontPointer& getRealizedFont() { return m_realizedFont.get(this, &PDFPageContentProcessor::getRealizedFontImpl); }
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/// Returns realized font (or empty font, if font can't be realized)
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PDFRealizedFontPointer getRealizedFontImpl();
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/// Checks, if stroking color is valid
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void checkStrokingColor();
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/// Checks, if filling color is valid
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void checkFillingColor();
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/// Read object from operand stack
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PDFObject readObjectFromOperandStack(size_t startPosition) const;
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/// Implementation of painting of XObject image
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void paintXObjectImage(const PDFStream* stream);
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/// Report warning about color operators in uncolored tiling pattern
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void reportWarningAboutColorOperatorsInUTP();
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/// Set rendering intent by name
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void setRenderingIntentByName(QByteArray renderingIntentName);
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/// Finishes marked content (if end of marked content is missing)
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void finishMarkedContent();
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const PDFPage* m_page;
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const PDFDocument* m_document;
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const PDFFontCache* m_fontCache;
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const PDFCMS* m_CMS;
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const PDFOptionalContentActivity* m_optionalContentActivity;
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const PDFDictionary* m_colorSpaceDictionary;
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const PDFDictionary* m_fontDictionary;
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const PDFDictionary* m_xobjectDictionary;
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const PDFDictionary* m_extendedGraphicStateDictionary;
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const PDFDictionary* m_propertiesDictionary;
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const PDFDictionary* m_shadingDictionary;
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const PDFDictionary* m_patternDictionary;
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ProcedureSets m_procedureSets;
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// Default color spaces
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PDFColorSpacePointer m_deviceGrayColorSpace;
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PDFColorSpacePointer m_deviceRGBColorSpace;
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PDFColorSpacePointer m_deviceCMYKColorSpace;
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/// Array with current operand arguments
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PDFFlatArray<PDFLexicalAnalyzer::Token, 33> m_operands;
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/// Stack with saved graphic states
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std::stack<PDFPageContentProcessorState> m_stack;
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/// Stack with transparency groups
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std::stack<PDFTransparencyGroup> m_transparencyGroupStack;
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/// Stack with marked content
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std::vector<MarkedContentState> m_markedContentStack;
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/// Current graphic state
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PDFPageContentProcessorState m_graphicState;
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/// List of errors
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QList<PDFRenderError> m_errorList;
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/// Current painter path
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QPainterPath m_currentPath;
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/// Nesting level of the begin/end of text object
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int m_textBeginEndState;
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/// Compatibility level (if positive, then unrecognized operators are ignored)
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int m_compatibilityBeginEndState;
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/// Is drawing uncolored tiling pattern?
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int m_drawingUncoloredTilingPatternState;
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/// Actually realized physical font
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PDFCachedItem<PDFRealizedFontPointer> m_realizedFont;
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/// Actual clipping path obtained from text. Clipping path
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/// is in device space coordinates.
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QPainterPath m_textClippingPath;
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/// Base matrix to be used when drawing patterns. Concatenate this matrix
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/// with pattern matrix to get transformation from pattern space to device space.
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QMatrix m_patternBaseMatrix;
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/// Matrix mapping page points to the device points
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QMatrix m_pagePointToDevicePointMatrix;
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/// Bounding rectangle of pages media box in device space coordinates. If drawing rotation
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/// is zero, then it corresponds to the scaled media box of the page.
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QRectF m_pageBoundingRectDeviceSpace;
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/// Mesh quality settings
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PDFMeshQualitySettings m_meshQualitySettings;
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/// Set with rendering errors, which were reported (and should be reported once)
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std::set<QString> m_onceReportedErrors;
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/// Active structural parent key
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PDFInteger m_structuralParentKey;
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};
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} // namespace pdf
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#endif // PDFPAGECONTENTPROCESSOR_H
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