1 files changed, 257 insertions, 0 deletions
diff --git a/src/extension/internal/pdfinput/svg-builder.h b/src/extension/internal/pdfinput/svg-builder.h
new file mode 100644
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--- /dev/null
+++ b/src/extension/internal/pdfinput/svg-builder.h
@@ -0,0 +1,257 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+#ifndef SEEN_EXTENSION_INTERNAL_PDFINPUT_SVGBUILDER_H
+#define SEEN_EXTENSION_INTERNAL_PDFINPUT_SVGBUILDER_H
+
+/*
+ * Authors:
+ *   miklos erdelyi
+ *
+ * Copyright (C) 2007 Authors
+ *
+ * Released under GNU GPL v2+, read the file 'COPYING' for more information.
+ */
+
+#ifdef HAVE_CONFIG_H
+# include "config.h"  // only include where actually required!
+#endif
+
+#ifdef HAVE_POPPLER
+#include "poppler-transition-api.h"
+
+class SPDocument;
+namespace Inkscape {
+    namespace XML {
+        struct Document;
+        class Node;
+    }
+}
+
+#include <2geom/point.h>
+#include <2geom/affine.h>
+#include <glibmm/ustring.h>
+
+#include "CharTypes.h"
+class Function;
+class GfxState;
+struct GfxColor;
+class GfxColorSpace;
+struct GfxRGB;
+class GfxPath;
+class GfxPattern;
+class GfxTilingPattern;
+class GfxShading;
+class GfxFont;
+class GfxImageColorMap;
+class Stream;
+class XRef;
+
+class SPCSSAttr;
+
+#include <vector>
+#include <glib.h>
+
+namespace Inkscape {
+namespace Extension {
+namespace Internal {
+
+struct SvgTransparencyGroup;
+
+/**
+ * Holds information about the current softmask and group depth for use of libpoppler.
+ * Could be later used to store other graphics state parameters so that we could
+ * emit only the differences in style settings from the parent state.
+ */
+struct SvgGraphicsState {
+    Inkscape::XML::Node *softmask; // Points to current softmask node
+    int group_depth;    // Depth of nesting groups at this level
+};
+
+/**
+ * Holds information about glyphs added by PdfParser which haven't been added
+ * to the document yet.
+ */
+struct SvgGlyph {
+    Geom::Point position;    // Absolute glyph coords
+    Geom::Point text_position; // Absolute glyph coords in text space
+    double dx;  // X advance value
+    double dy;  // Y advance value
+    double rise;    // Text rise parameter
+    Glib::ustring code;   // UTF-8 coded character
+    bool is_space;
+
+    bool style_changed;  // Set to true if style has to be reset
+    SPCSSAttr *style;
+    int render_mode;    // Text render mode
+    const char *font_specification;   // Pointer to current font specification
+};
+
+/**
+ * Builds the inner SVG representation using libpoppler from the calls of PdfParser.
+ */
+class SvgBuilder {
+public:
+    SvgBuilder(SPDocument *document, gchar *docname, XRef *xref);
+    SvgBuilder(SvgBuilder *parent, Inkscape::XML::Node *root);
+    virtual ~SvgBuilder();
+
+    // Property setting
+    void setDocumentSize(double width, double height);  // Document size in px
+    void setAsLayer(char *layer_name=nullptr);
+    void setGroupOpacity(double opacity);
+    Inkscape::XML::Node *getPreferences() {
+        return _preferences;
+    }
+    void pushPage();
+
+    // Handling the node stack
+    Inkscape::XML::Node *pushGroup();
+    Inkscape::XML::Node *popGroup();
+    Inkscape::XML::Node *getContainer();    // Returns current group node
+
+    // Path adding
+    void addPath(GfxState *state, bool fill, bool stroke, bool even_odd=false);
+    void addShadedFill(GfxShading *shading, double *matrix, GfxPath *path, bool even_odd=false);
+
+    // Image handling
+    void addImage(GfxState *state, Stream *str, int width, int height,
+                  GfxImageColorMap *color_map, bool interpolate, int *mask_colors);
+    void addImageMask(GfxState *state, Stream *str, int width, int height,
+                      bool invert, bool interpolate);
+    void addMaskedImage(GfxState *state, Stream *str, int width, int height,
+                        GfxImageColorMap *color_map, bool interpolate,
+                        Stream *mask_str, int mask_width, int mask_height,
+                        bool invert_mask, bool mask_interpolate);
+    void addSoftMaskedImage(GfxState *state, Stream *str, int width, int height,
+                            GfxImageColorMap *color_map, bool interpolate,
+                            Stream *mask_str, int mask_width, int mask_height,
+                            GfxImageColorMap *mask_color_map, bool mask_interpolate);
+
+    // Transparency group and soft mask handling
+    void pushTransparencyGroup(GfxState *state, double *bbox,
+                               GfxColorSpace *blending_color_space,
+                               bool isolated, bool knockout,
+                               bool for_softmask);
+    void popTransparencyGroup(GfxState *state);
+    void paintTransparencyGroup(GfxState *state, double *bbox);
+    void setSoftMask(GfxState *state, double *bbox, bool alpha,
+                     Function *transfer_func, GfxColor *backdrop_color);
+    void clearSoftMask(GfxState *state);
+
+    // Text handling
+    void beginString(GfxState *state);
+    void endString(GfxState *state);
+    void addChar(GfxState *state, double x, double y,
+                 double dx, double dy,
+                 double originX, double originY,
+                 CharCode code, int nBytes, Unicode const *u, int uLen);
+    void beginTextObject(GfxState *state);
+    void endTextObject(GfxState *state);
+
+    bool isPatternTypeSupported(GfxPattern *pattern);
+
+    // State manipulation
+    void saveState();
+    void restoreState();
+    void updateStyle(GfxState *state);
+    void updateFont(GfxState *state);
+    void updateTextPosition(double tx, double ty);
+    void updateTextShift(GfxState *state, double shift);
+    void updateTextMatrix(GfxState *state);
+
+    // Clipping
+    void clip(GfxState *state, bool even_odd=false);
+    void setClipPath(GfxState *state, bool even_odd=false);
+
+    // Transforming
+    void setTransform(double c0, double c1, double c2, double c3, double c4,
+                      double c5);
+    void setTransform(double const *transform);
+    bool getTransform(double *transform);
+
+private:
+    void _init();
+
+    // Pattern creation
+    gchar *_createPattern(GfxPattern *pattern, GfxState *state, bool is_stroke=false);
+    gchar *_createGradient(GfxShading *shading, double *matrix, bool for_shading=false);
+    void _addStopToGradient(Inkscape::XML::Node *gradient, double offset,
+                            GfxRGB *color, double opacity);
+    bool _addGradientStops(Inkscape::XML::Node *gradient, GfxShading *shading,
+                           _POPPLER_CONST Function *func);
+    gchar *_createTilingPattern(GfxTilingPattern *tiling_pattern, GfxState *state,
+                                bool is_stroke=false);
+    // Image/mask creation
+    Inkscape::XML::Node *_createImage(Stream *str, int width, int height,
+                                      GfxImageColorMap *color_map, bool interpolate,
+                                      int *mask_colors, bool alpha_only=false,
+                                      bool invert_alpha=false);
+    Inkscape::XML::Node *_createMask(double width, double height);
+    // Style setting
+    SPCSSAttr *_setStyle(GfxState *state, bool fill, bool stroke, bool even_odd=false);
+    void _setStrokeStyle(SPCSSAttr *css, GfxState *state);
+    void _setFillStyle(SPCSSAttr *css, GfxState *state, bool even_odd);
+    void _setBlendMode(Inkscape::XML::Node *node, GfxState *state);
+    void _flushText();    // Write buffered text into doc
+
+    std::string _BestMatchingFont(std::string PDFname);
+
+    // Handling of node stack
+    Inkscape::XML::Node *pushNode(const char* name);
+    Inkscape::XML::Node *popNode();
+    std::vector<Inkscape::XML::Node *> _node_stack;
+    std::vector<int> _group_depth;    // Depth of nesting groups
+    SvgTransparencyGroup *_transp_group_stack;  // Transparency group stack
+    std::vector<SvgGraphicsState> _state_stack;
+
+    SPCSSAttr *_font_style;          // Current font style
+    const char *_font_specification;
+    double _font_scaling;
+    bool _need_font_update;
+    Geom::Affine _text_matrix;
+    Geom::Point _text_position;
+    std::vector<SvgGlyph> _glyphs;   // Added characters
+    bool _in_text_object;   // Whether we are inside a text object
+    bool _invalidated_style;
+    GfxState *_current_state;
+    std::vector<std::string> _availableFontNames; // Full names, used for matching font names (Bug LP #179589).
+
+    bool _is_top_level;  // Whether this SvgBuilder is the top-level one
+    SPDocument *_doc;
+    gchar *_docname;    // Basename of the URI from which this document is created
+    XRef *_xref;    // Cross-reference table from the PDF doc we're converting from
+    Inkscape::XML::Document *_xml_doc;
+    Inkscape::XML::Node *_root;  // Root node from the point of view of this SvgBuilder
+    Inkscape::XML::Node *_container; // Current container (group/pattern/mask)
+    Inkscape::XML::Node *_preferences;  // Preferences container node
+    double _width;       // Document size in px
+    double _height;       // Document size in px
+    double _ttm[6]; ///< temporary transform matrix
+    bool _ttm_is_set;
+    
+    Inkscape::XML::Node *_nv = nullptr; // XML NameView xml
+    Inkscape::XML::Node *_page = nullptr; // XML Page definition
+    int _page_num = 0; // Are we on a page
+    double _page_left = 0 ; // Move to the left for more pages
+    double _page_top = 0 ; // Move to the top (maybe)
+    bool _page_offset = false;
+};
+
+
+} // namespace Internal
+} // namespace Extension
+} // namespace Inkscape
+
+#endif // HAVE_POPPLER
+
+#endif // SEEN_EXTENSION_INTERNAL_PDFINPUT_SVGBUILDER_H
+
+/*
+  Local Variables:
+  mode:c++
+  c-file-style:"stroustrup"
+  c-file-offsets:((innamespace . 0)(inline-open . 0))
+  indent-tabs-mode:nil
+  fill-column:99
+  End:
+*/
+// vim: filetype=cpp:expandtab:shiftwidth=4:tabstop=8:softtabstop=4 :