| //======================================================================== |
| // |
| // SplashXPathScanner.h |
| // |
| //======================================================================== |
| |
| //======================================================================== |
| // |
| // Modified under the Poppler project - http://poppler.freedesktop.org |
| // |
| // All changes made under the Poppler project to this file are licensed |
| // under GPL version 2 or later |
| // |
| // Copyright (C) 2013, 2014, 2021 Thomas Freitag <Thomas.Freitag@alfa.de> |
| // Copyright (C) 2018, 2021 Albert Astals Cid <aacid@kde.org> |
| // Copyright (C) 2018 Stefan BrĂ¼ns <stefan.bruens@rwth-aachen.de> |
| // |
| // To see a description of the changes please see the Changelog file that |
| // came with your tarball or type make ChangeLog if you are building from git |
| // |
| //======================================================================== |
| |
| #ifndef SPLASHXPATHSCANNER_H |
| #define SPLASHXPATHSCANNER_H |
| |
| #include "SplashTypes.h" |
| |
| #include <poppler-config.h> |
| |
| #ifdef USE_BOOST_HEADERS |
| # include <boost/container/small_vector.hpp> |
| #endif |
| |
| #include <vector> |
| |
| class SplashXPath; |
| class SplashBitmap; |
| |
| struct SplashIntersect |
| { |
| int y; |
| int x0, x1; // intersection of segment with [y, y+1) |
| int count; // EO/NZWN counter increment |
| }; |
| |
| //------------------------------------------------------------------------ |
| // SplashXPathScanner |
| //------------------------------------------------------------------------ |
| |
| class SplashXPathScanner |
| { |
| public: |
| // Create a new SplashXPathScanner object. <xPathA> must be sorted. |
| SplashXPathScanner(const SplashXPath &xPath, bool eoA, int clipYMin, int clipYMax); |
| |
| ~SplashXPathScanner(); |
| |
| SplashXPathScanner(const SplashXPathScanner &) = delete; |
| SplashXPathScanner &operator=(const SplashXPathScanner &) = delete; |
| |
| // Return the path's bounding box. |
| void getBBox(int *xMinA, int *yMinA, int *xMaxA, int *yMaxA) const |
| { |
| *xMinA = xMin; |
| *yMinA = yMin; |
| *xMaxA = xMax; |
| *yMaxA = yMax; |
| } |
| |
| // Return the path's bounding box. |
| void getBBoxAA(int *xMinA, int *yMinA, int *xMaxA, int *yMaxA) const; |
| |
| // Returns true if at least part of the path was outside the |
| // clipYMin/clipYMax bounds passed to the constructor. |
| bool hasPartialClip() const { return partialClip; } |
| |
| // Return the min/max x values for the span at <y>. |
| void getSpanBounds(int y, int *spanXMin, int *spanXMax) const; |
| |
| // Returns true if (<x>,<y>) is inside the path. |
| bool test(int x, int y) const; |
| |
| // Returns true if the entire span ([<x0>,<x1>], <y>) is inside the |
| // path. |
| bool testSpan(int x0, int x1, int y) const; |
| |
| // Renders one anti-aliased line into <aaBuf>. Returns the min and |
| // max x coordinates with non-zero pixels in <x0> and <x1>. |
| void renderAALine(SplashBitmap *aaBuf, int *x0, int *x1, int y, bool adjustVertLine = false) const; |
| |
| // Clips an anti-aliased line by setting pixels to zero. On entry, |
| // all non-zero pixels are between <x0> and <x1>. This function |
| // will update <x0> and <x1>. |
| void clipAALine(SplashBitmap *aaBuf, const int *x0, const int *x1, int y) const; |
| |
| private: |
| void computeIntersections(const SplashXPath &xPath); |
| bool addIntersection(double segYMin, double segYMax, int y, int x0, int x1, int count); |
| |
| bool eo; |
| int xMin, yMin, xMax, yMax; |
| bool partialClip; |
| |
| #ifdef USE_BOOST_HEADERS |
| typedef boost::container::small_vector<SplashIntersect, 4> IntersectionLine; |
| #else |
| typedef std::vector<SplashIntersect> IntersectionLine; |
| #endif |
| std::vector<IntersectionLine> allIntersections; |
| |
| friend class SplashXPathScanIterator; |
| }; |
| |
| class SplashXPathScanIterator |
| { |
| public: |
| SplashXPathScanIterator(const SplashXPathScanner &scanner, int y); |
| |
| // Returns the next span inside the path at the current y position |
| // Returns false if there are no more spans. |
| bool getNextSpan(int *x0, int *x1); |
| |
| private: |
| #ifdef USE_BOOST_HEADERS |
| typedef boost::container::small_vector<SplashIntersect, 4> IntersectionLine; |
| #else |
| typedef std::vector<SplashIntersect> IntersectionLine; |
| #endif |
| const IntersectionLine &line; |
| |
| size_t interIdx; // current index into <line> |
| int interCount; // current EO/NZWN counter |
| const bool eo; |
| }; |
| |
| #endif |