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364 lines
12 KiB
C++
364 lines
12 KiB
C++
/*
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* HTMLRenderer.h
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*
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* by WangLu
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*/
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#ifndef HTMLRENDERER_H_
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#define HTMLRENDERER_H_
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#include <unordered_map>
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#include <map>
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#include <vector>
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#include <set>
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#include <sstream>
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#include <cstdint>
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#include <boost/format.hpp>
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#include <boost/filesystem/fstream.hpp>
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#include <OutputDev.h>
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#include <GfxState.h>
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#include <Stream.h>
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#include <XRef.h>
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#include <Catalog.h>
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#include <Page.h>
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#include <PDFDoc.h>
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#include <goo/gtypes.h>
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#include <Object.h>
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#include <GfxFont.h>
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#include "Param.h"
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#include "util.h"
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/*
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* Naming Convention
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*
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* CSS classes
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*
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* p - Page
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* l - Line
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* _ - white space
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* i - Image
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*
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* Reusable CSS classes
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*
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* t<hex> - Transform matrix
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* f<hex> - Font (also for font names)
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* s<hex> - font Size
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* l<hex> - Letter spacing
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* w<hex> - Word spacing
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* c<hex> - Color
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* _<hex> - white space
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* r<hex> - Rise
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*
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*/
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class HTMLRenderer : public OutputDev
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{
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public:
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HTMLRenderer(const Param * param);
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virtual ~HTMLRenderer();
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void process(PDFDoc * doc);
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////////////////////////////////////////////////////
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// OutputDev interface
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////////////////////////////////////////////////////
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// Does this device use upside-down coordinates?
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// (Upside-down means (0,0) is the top left corner of the page.)
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virtual GBool upsideDown() { return gFalse; }
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// Does this device use drawChar() or drawString()?
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virtual GBool useDrawChar() { return gFalse; }
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// Does this device use beginType3Char/endType3Char? Otherwise,
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// text in Type 3 fonts will be drawn with drawChar/drawString.
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virtual GBool interpretType3Chars() { return gFalse; }
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// Does this device need non-text content?
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virtual GBool needNonText() { return gFalse; }
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virtual void pre_process();
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virtual void post_process();
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virtual void process_single_html();
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// Start a page.
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virtual void startPage(int pageNum, GfxState *state);
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// End a page.
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virtual void endPage();
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/*
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* To optmize false alarms
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* We just mark as changed, and recheck if they have been changed when we are about to output a new string
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*/
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virtual void updateAll(GfxState * state);
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virtual void updateRise(GfxState * state);
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virtual void updateTextPos(GfxState * state);
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virtual void updateTextShift(GfxState * state, double shift);
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virtual void updateFont(GfxState * state);
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virtual void updateCTM(GfxState * state, double m11, double m12, double m21, double m22, double m31, double m32);
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virtual void updateTextMat(GfxState * state);
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virtual void updateHorizScaling(GfxState * state);
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virtual void updateCharSpace(GfxState * state);
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virtual void updateWordSpace(GfxState * state);
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virtual void updateFillColor(GfxState * state);
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/*
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* Rendering
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*/
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virtual void drawString(GfxState * state, GooString * s);
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virtual void drawImage(GfxState * state, Object * ref, Stream * str, int width, int height, GfxImageColorMap * colorMap, GBool interpolate, int *maskColors, GBool inlineImg);
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protected:
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////////////////////////////////////////////////////
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// misc
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////////////////////////////////////////////////////
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void add_tmp_file (const std::string & fn);
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void clean_tmp_files ();
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boost::filesystem::path dump_embedded_font (GfxFont * font, long long fn_id);
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void embed_font(const boost::filesystem::path & filepath, GfxFont * font, FontInfo & info, bool get_metric_only = false);
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////////////////////////////////////////////////////
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// manage styles
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////////////////////////////////////////////////////
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const FontInfo * install_font(GfxFont * font);
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void install_embedded_font(GfxFont * font, FontInfo & info);
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void install_base_font(GfxFont * font, GfxFontLoc * font_loc, FontInfo & info);
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void install_external_font (GfxFont * font, FontInfo & info);
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long long install_font_size(double font_size);
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long long install_transform_matrix(const double * tm);
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long long install_letter_space(double letter_space);
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long long install_word_space(double word_space);
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long long install_color(const GfxRGB * rgb);
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long long install_whitespace(double ws_width, double & actual_width);
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long long install_rise(double rise);
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////////////////////////////////////////////////////
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// export css styles
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////////////////////////////////////////////////////
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/*
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* remote font: to be retrieved from the web server
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* local font: to be substituted with a local (client side) font
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*/
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void export_remote_font(const FontInfo & info, const std::string & suffix, const std::string & fontfileformat, GfxFont * font);
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void export_remote_default_font(long long fn_id);
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void export_local_font(const FontInfo & info, GfxFont * font, const std::string & original_font_name, const std::string & cssfont);
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void export_font_size(long long fs_id, double font_size);
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void export_transform_matrix(long long tm_id, const double * tm);
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void export_letter_space(long long ls_id, double letter_space);
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void export_word_space(long long ws_id, double word_space);
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void export_color(long long color_id, const GfxRGB * rgb);
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void export_whitespace(long long ws_id, double ws_width);
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void export_rise(long long rise_id, double rise);
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////////////////////////////////////////////////////
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// state tracking
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////////////////////////////////////////////////////
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// check updated states, and determine new_line_stauts
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// make sure this function can be called several times consecutively without problem
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void check_state_change(GfxState * state);
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// reset all ***_changed flags
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void reset_state_change();
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// prepare the line context, (close old tags, open new tags)
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// make sure the current HTML style consistent with PDF
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void prepare_line(GfxState * state);
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void close_line();
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////////////////////////////////////////////////////
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// PDF stuffs
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////////////////////////////////////////////////////
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XRef * xref;
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// page info
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int pageNum;
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double pageWidth ;
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double pageHeight ;
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////////////////////////////////////////////////////
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// states
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////////////////////////////////////////////////////
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bool line_opened;
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enum class NewLineState
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{
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NONE, // stay with the same style
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SPAN, // open a new <span> if possible, otherwise a new <div>
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DIV // has to open a new <div>
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} new_line_state;
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// The order is according to the appearance in check_state_change
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// any state changed
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bool all_changed;
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// current position
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double cur_tx, cur_ty; // real text position, in text coords
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bool text_pos_changed;
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// font & size
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const FontInfo * cur_font_info;
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double cur_font_size;
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long long cur_fs_id;
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bool font_changed;
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// transform matrix
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long long cur_tm_id;
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bool ctm_changed;
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bool text_mat_changed;
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// horizontal scaling
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bool hori_scale_changed;
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// this is CTM * TextMAT in PDF, not only CTM
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// [4] and [5] are ignored,
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// as we'll calculate the position of the origin separately
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// TODO: changed this for images
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double cur_ctm[6]; // unscaled
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// letter spacing
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long long cur_ls_id;
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double cur_letter_space;
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bool letter_space_changed;
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// word spacing
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long long cur_ws_id;
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double cur_word_space;
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bool word_space_changed;
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// color
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long long cur_color_id;
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GfxRGB cur_color;
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bool color_changed;
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// rise
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long long cur_rise_id;
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double cur_rise;
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bool rise_changed;
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// optimize for web
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// we try to render the final font size directly
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// to reduce the effect of ctm as much as possible
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// draw_ctm is cur_ctm scaled by 1/draw_scale,
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// so everything redenered should be multiplied by draw_scale
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double draw_ctm[6];
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double draw_font_size;
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double draw_scale;
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// the position of next char, in text coords
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// this is actual position (in HTML), which might be different from cur_tx/ty (in PDF)
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// also keep in mind that they are not the final position, as they will be transform by CTM (also true for cur_tx/ty)
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double draw_tx, draw_ty;
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// some metrics have to be determined after all elements in the lines have been seen
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class LineBuffer {
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public:
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LineBuffer (HTMLRenderer * renderer) : renderer(renderer) { }
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class State {
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public:
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void begin(std::ostream & out, const State * prev_state);
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void end(std::ostream & out) const;
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void hash(void);
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int diff(const State & s) const;
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enum {
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FONT_ID,
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FONT_SIZE_ID,
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COLOR_ID,
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LETTER_SPACE_ID,
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WORD_SPACE_ID,
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RISE_ID,
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ID_COUNT
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};
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long long ids[ID_COUNT];
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double ascent;
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double descent;
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double draw_font_size;
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size_t start_idx; // index of the first Text using this state
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// for optimzation
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long long hash_value;
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int depth; // the depth in the state tree
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bool need_close;
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static const char * format_str; // class names for each id
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};
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class Offset {
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public:
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size_t start_idx; // should put this idx before text[start_idx];
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double width;
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};
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void reset(GfxState * state);
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void append_unicodes(const Unicode * u, int l);
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void append_offset(double width);
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void append_state(void);
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void flush(void);
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private:
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// retrieve state from renderer
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void set_state(State & state);
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// build the state tree in order to minimize the size of output
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void optimize_states(void);
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HTMLRenderer * renderer;
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double x, y;
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long long tm_id;
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std::vector<State> states;
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std::vector<Offset> offsets;
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std::vector<Unicode> text;
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} line_buf;
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friend class LineBuffer;
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// for font reencoding
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int32_t * cur_mapping;
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char ** cur_mapping2;
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////////////////////////////////////////////////////
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// styles & resources
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////////////////////////////////////////////////////
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std::unordered_map<long long, FontInfo> font_name_map;
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std::map<double, long long> font_size_map;
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std::map<TM, long long> transform_matrix_map;
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std::map<double, long long> letter_space_map;
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std::map<double, long long> word_space_map;
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std::map<GfxRGB, long long> color_map;
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std::map<double, long long> whitespace_map;
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std::map<double, long long> rise_map;
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int image_count;
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const Param * param;
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boost::filesystem::path dest_dir, tmp_dir;
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boost::filesystem::ofstream html_fout, allcss_fout;
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std::set<std::string> tmp_files;
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static const std::string HEAD_HTML_FILENAME;
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static const std::string NECK_HTML_FILENAME;
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static const std::string TAIL_HTML_FILENAME;
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static const std::string CSS_FILENAME;
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};
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#endif /* HTMLRENDERER_H_ */
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