include/poppler/MarkedContentOutputDev.h

0001 //========================================================================
0002 //
0003 // MarkedContentOutputDev.h
0004 //
0005 // This file is licensed under the GPLv2 or later
0006 //
0007 // Copyright 2013 Igalia S.L.
0008 // Copyright 2018-2021 Albert Astals Cid <aacid@kde.org>
0009 // Copyright 2021 Adrian Johnson <ajohnson@redneon.com>
0010 // Copyright 2022 Oliver Sander <oliver.sander@tu-dresden.de>
0011 //
0012 //========================================================================
0013
0014 #ifndef MARKEDCONTENTOUTPUTDEV_H
0015 #define MARKEDCONTENTOUTPUTDEV_H
0016
0017 #include "goo/gmem.h"
0018 #include "poppler_private_export.h"
0019 #include "OutputDev.h"
0020 #include "GfxState.h"
0021 #include "GfxFont.h"
0022 #include <vector>
0023
0024 class Dict;
0025 class UnicodeMap;
0026
0027 class TextSpan
0028 {
0029 public:
0030     TextSpan(const TextSpan &other) : data(other.data) { data->refcount++; }
0031
0032     TextSpan &operator=(const TextSpan &other)
0033     {
0034         if (this != &other) {
0035             data = other.data;
0036             data->refcount++;
0037         }
0038         return *this;
0039     }
0040
0041     ~TextSpan()
0042     {
0043         if (data && --data->refcount == 0) {
0044             delete data;
0045         }
0046     }
0047
0048     const std::shared_ptr<GfxFont> &getFont() const { return data->font; }
0049     GooString *getText() const { return data->text; }
0050     GfxRGB &getColor() const { return data->color; }
0051
0052 private:
0053     // Note: Takes ownership of strings, increases refcount for font.
0054     TextSpan(GooString *text, std::shared_ptr<GfxFont> font, const GfxRGB color) : data(new Data)
0055     {
0056         data->text = text;
0057         data->font = std::move(font);
0058         data->color = color;
0059     }
0060
0061     struct Data
0062     {
0063         std::shared_ptr<GfxFont> font;
0064         GooString *text;
0065         GfxRGB color;
0066         unsigned refcount;
0067
0068         Data() : refcount(1) { }
0069
0070         ~Data()
0071         {
0072             assert(refcount == 0);
0073             delete text;
0074         }
0075
0076         Data(const Data &) = delete;
0077         Data &operator=(const Data &) = delete;
0078     };
0079
0080     Data *data;
0081
0082     friend class MarkedContentOutputDev;
0083 };
0084
0085 typedef std::vector<TextSpan> TextSpanArray;
0086
0087 class POPPLER_PRIVATE_EXPORT MarkedContentOutputDev : public OutputDev
0088 {
0089 public:
0090     explicit MarkedContentOutputDev(int mcidA, const Object &stmObj);
0091     ~MarkedContentOutputDev() override;
0092
0093     virtual bool isOk() { return true; }
0094     bool upsideDown() override { return true; }
0095     bool useDrawChar() override { return true; }
0096     bool interpretType3Chars() override { return false; }
0097     bool needNonText() override { return false; }
0098     bool needCharCount() override { return false; }
0099
0100     void startPage(int pageNum, GfxState *state, XRef *xref) override;
0101     void endPage() override;
0102
0103     void beginForm(Ref id) override;
0104     void endForm(Ref id) override;
0105
0106     void drawChar(GfxState *state, double xx, double yy, double dx, double dy, double ox, double oy, CharCode c, int nBytes, const Unicode *u, int uLen) override;
0107
0108     void beginMarkedContent(const char *name, Dict *properties) override;
0109     void endMarkedContent(GfxState *state) override;
0110
0111     const TextSpanArray &getTextSpans() const;
0112
0113 private:
0114     void endSpan();
0115     bool inMarkedContent() const { return mcidStack.size() > 0; }
0116     bool contentStreamMatch();
0117     bool needFontChange(const std::shared_ptr<const GfxFont> &font) const;
0118
0119     std::shared_ptr<GfxFont> currentFont;
0120     GooString *currentText;
0121     GfxRGB currentColor;
0122     TextSpanArray textSpans;
0123     int mcid;
0124     std::vector<int> mcidStack;
0125     std::vector<Ref> formStack;
0126     double pageWidth;
0127     double pageHeight;
0128     const UnicodeMap *unicodeMap;
0129     Object stmRef;
0130 };
0131
0132 #endif /* !MARKEDCONTENTOUTPUTDEV_H */