69 lines
1.7 KiB
C++
69 lines
1.7 KiB
C++
/*
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* CoveredTextDetector.h
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*
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* Created on: 2014-6-14
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* Author: duanyao
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*/
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#ifndef COVEREDTEXTDETECTOR_H__
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#define COVEREDTEXTDETECTOR_H__
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#include <vector>
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#include "Param.h"
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#include <cairo.h>
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namespace pdf2htmlEX {
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/**
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* Detect characters that are covered by non-char graphics on a page.
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*/
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class CoveredTextDetector
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{
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public:
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CoveredTextDetector(Param & param);
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/**
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* Reset to initial state. Should be called when start drawing a page.
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*/
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void reset();
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/**
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* Add a drawn character's bounding box.
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* @param bbox (x0, y0, x1, y1)
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*/
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void add_char_bbox(cairo_t *, double * bbox);
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void add_char_bbox_clipped(cairo_t *,double * bbox, int pts_covered);
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/**
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* Add a drawn non-char graphics' bounding box.
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* If it intersects any previously drawn char's bbox, the char is marked as covered
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* and treated as an non-char.
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* @param bbox (x0, y0, x1, y1)
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* @param index this graphics' drawing order: assume it is drawn after (index-1)th
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* char. -1 means after the last char.
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*/
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void add_non_char_bbox(cairo_t *cairo, double * bbox, int what);
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/**
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* An array of flags indicating whether a char is covered by any non-char graphics.
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* Index by the order that these chars are added.
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* This vector grows as add_char_bbox() is called, so its size is the count
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* of currently drawn chars.
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*/
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const std::vector<bool> & get_chars_covered() { return chars_covered; }
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private:
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std::vector<bool> chars_covered;
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// x00, y00, x01, y01; x10, y10, x11, y11;...
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std::vector<double> char_bboxes;
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std::vector<int> char_pts_visible;
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Param & param;
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};
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}
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#endif /* COVEREDTEXTDETECTOR_H__ */
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