2 * \file PreviewLoader.C
3 * Copyright 2002 the LyX Team
4 * Read the file COPYING
6 * \author Angus Leeming <leeming@lyx.org>
12 #pragma implementation
15 #include "PreviewLoader.h"
16 #include "PreviewImage.h"
19 #include "converter.h"
24 #include "insets/inset.h"
26 #include "frontends/lyx_gui.h" // hexname
28 #include "support/filetools.h"
29 #include "support/forkedcall.h"
30 #include "support/forkedcontr.h"
31 #include "support/lstrings.h"
32 #include "support/lyxlib.h"
34 #include <boost/bind.hpp>
35 #include <boost/signals/trackable.hpp>
63 typedef pair<string, string> StrPair;
65 // A list of alll snippets to be converted to previews
66 typedef list<string> PendingSnippets;
68 // Each item in the vector is a pair<snippet, image file name>.
69 typedef vector<StrPair> BitmapFile;
71 string const unique_filename(string const bufferpath);
73 Converter const * setConverter();
75 void setAscentFractions(vector<double> & ascent_fractions,
76 string const & metrics_file);
79 FindFirst(string const & comp) : comp_(comp) {}
80 bool operator()(StrPair const & sp)
82 return sp.first < comp_;
89 /// Store info on a currently executing, forked process.
92 InProgress() : pid(0) {}
94 InProgress(string const & filename_base,
95 PendingSnippets const & pending,
96 string const & to_format);
97 /// Remove any files left lying around and kill the forked process.
108 typedef map<string, InProgress> InProgressProcesses;
110 typedef InProgressProcesses::value_type InProgressProcess;
117 struct PreviewLoader::Impl : public boost::signals::trackable {
119 Impl(PreviewLoader & p, Buffer const & b);
120 /// Stop any InProgress items still executing.
123 PreviewImage const * preview(string const & latex_snippet) const;
125 PreviewLoader::Status status(string const & latex_snippet) const;
127 void add(string const & latex_snippet);
129 void remove(string const & latex_snippet);
133 /// Emit this signal when an image is ready for display.
134 boost::signal1<void, PreviewImage const &> imageReady;
136 Buffer const & buffer() const { return buffer_; }
139 /// Called by the Forkedcall process that generated the bitmap files.
140 void finishedGenerating(string const &, pid_t, int);
142 void dumpPreamble(ostream &) const;
144 void dumpData(ostream &, BitmapFile const &) const;
146 /** cache_ allows easy retrieval of already-generated images
147 * using the LaTeX snippet as the identifier.
149 typedef boost::shared_ptr<PreviewImage> PreviewImagePtr;
151 typedef map<string, PreviewImagePtr> Cache;
155 /** pending_ stores the LaTeX snippets in anticipation of them being
156 * sent to the converter.
158 PendingSnippets pending_;
160 /** in_progress_ stores all forked processes so that we can proceed
162 The map uses the conversion commands as its identifiers.
164 InProgressProcesses in_progress_;
167 PreviewLoader & parent_;
169 Buffer const & buffer_;
171 double font_scaling_factor_;
173 /// We don't own this
174 static Converter const * pconverter_;
178 Converter const * PreviewLoader::Impl::pconverter_;
181 // The public interface, defined in PreviewLoader.h
182 // ================================================
183 PreviewLoader::PreviewLoader(Buffer const & b)
184 : pimpl_(new Impl(*this, b))
188 PreviewLoader::~PreviewLoader()
192 PreviewImage const * PreviewLoader::preview(string const & latex_snippet) const
194 return pimpl_->preview(latex_snippet);
198 PreviewLoader::Status PreviewLoader::status(string const & latex_snippet) const
200 return pimpl_->status(latex_snippet);
204 void PreviewLoader::add(string const & latex_snippet) const
206 pimpl_->add(latex_snippet);
210 void PreviewLoader::remove(string const & latex_snippet) const
212 pimpl_->remove(latex_snippet);
216 void PreviewLoader::startLoading() const
218 pimpl_->startLoading();
222 boost::signals::connection PreviewLoader::connect(slot_type const & slot) const
224 return pimpl_->imageReady.connect(slot);
228 void PreviewLoader::emitSignal(PreviewImage const & pimage) const
230 pimpl_->imageReady(pimage);
234 Buffer const & PreviewLoader::buffer() const
236 return pimpl_->buffer();
242 // The details of the Impl
243 // =======================
247 struct IncrementedFileName {
248 IncrementedFileName(string const & to_format,
249 string const & filename_base)
250 : to_format_(to_format), base_(filename_base), counter_(1)
253 StrPair const operator()(string const & snippet)
257 << setfill('0') << setw(3) << counter_++
258 << "." << to_format_;
260 string const file = os.str().c_str();
262 return make_pair(snippet, file);
266 string const & to_format_;
267 string const & base_;
272 InProgress::InProgress(string const & filename_base,
273 PendingSnippets const & pending,
274 string const & to_format)
276 metrics_file(filename_base + ".metrics"),
277 snippets(pending.size())
279 PendingSnippets::const_iterator pit = pending.begin();
280 PendingSnippets::const_iterator pend = pending.end();
281 BitmapFile::iterator sit = snippets.begin();
283 std::transform(pit, pend, sit,
284 IncrementedFileName(to_format, filename_base));
288 void InProgress::stop() const
291 ForkedcallsController::get().kill(pid, 0);
293 if (!metrics_file.empty())
294 lyx::unlink(metrics_file);
296 BitmapFile::const_iterator vit = snippets.begin();
297 BitmapFile::const_iterator vend = snippets.end();
298 for (; vit != vend; ++vit) {
299 if (!vit->second.empty())
300 lyx::unlink(vit->second);
309 PreviewLoader::Impl::Impl(PreviewLoader & p, Buffer const & b)
310 : parent_(p), buffer_(b), font_scaling_factor_(0.0)
312 font_scaling_factor_ = 0.01 * lyxrc.dpi * lyxrc.zoom *
313 lyxrc.preview_scale_factor;
315 lyxerr[Debug::GRAPHICS] << "The font scaling factor is "
316 << font_scaling_factor_ << endl;
319 pconverter_ = setConverter();
323 PreviewLoader::Impl::~Impl()
325 InProgressProcesses::iterator ipit = in_progress_.begin();
326 InProgressProcesses::iterator ipend = in_progress_.end();
328 for (; ipit != ipend; ++ipit) {
335 PreviewLoader::Impl::preview(string const & latex_snippet) const
337 Cache::const_iterator it = cache_.find(latex_snippet);
338 return (it == cache_.end()) ? 0 : it->second.get();
345 FindSnippet(string const & s) : snippet_(s) {}
346 bool operator()(InProgressProcess const & process)
348 BitmapFile const & snippets = process.second.snippets;
349 BitmapFile::const_iterator it = snippets.begin();
350 BitmapFile::const_iterator end = snippets.end();
351 it = find_if(it, end, FindFirst(snippet_));
356 string const & snippet_;
361 PreviewLoader::Status
362 PreviewLoader::Impl::status(string const & latex_snippet) const
364 Cache::const_iterator cit = cache_.find(latex_snippet);
365 if (cit != cache_.end())
368 PendingSnippets::const_iterator pit = pending_.begin();
369 PendingSnippets::const_iterator pend = pending_.end();
371 pit = find(pit, pend, latex_snippet);
375 InProgressProcesses::const_iterator ipit = in_progress_.begin();
376 InProgressProcesses::const_iterator ipend = in_progress_.end();
378 ipit = find_if(ipit, ipend, FindSnippet(latex_snippet));
386 void PreviewLoader::Impl::add(string const & latex_snippet)
388 if (!pconverter_ || status(latex_snippet) != NotFound)
391 string const snippet = trim(latex_snippet);
395 lyxerr[Debug::GRAPHICS] << "adding snippet:\n" << snippet << endl;
397 pending_.push_back(snippet);
403 struct EraseSnippet {
404 EraseSnippet(string const & s) : snippet_(s) {}
405 void operator()(InProgressProcess & process)
407 BitmapFile & snippets = process.second.snippets;
408 BitmapFile::iterator it = snippets.begin();
409 BitmapFile::iterator end = snippets.end();
411 it = find_if(it, end, FindFirst(snippet_));
413 snippets.erase(it, it+1);
417 string const & snippet_;
423 void PreviewLoader::Impl::remove(string const & latex_snippet)
425 Cache::iterator cit = cache_.find(latex_snippet);
426 if (cit != cache_.end())
429 PendingSnippets::iterator pit = pending_.begin();
430 PendingSnippets::iterator pend = pending_.end();
432 pending_.erase(std::remove(pit, pend, latex_snippet), pend);
434 InProgressProcesses::iterator ipit = in_progress_.begin();
435 InProgressProcesses::iterator ipend = in_progress_.end();
437 std::for_each(ipit, ipend, EraseSnippet(latex_snippet));
439 for (; ipit != ipend; ++ipit) {
440 InProgressProcesses::iterator curr = ipit++;
441 if (curr->second.snippets.empty())
442 in_progress_.erase(curr);
447 void PreviewLoader::Impl::startLoading()
449 if (pending_.empty() || !pconverter_)
452 lyxerr[Debug::GRAPHICS] << "PreviewLoader::startLoading()" << endl;
454 // As used by the LaTeX file and by the resulting image files
455 string const filename_base(unique_filename(buffer_.tmppath));
457 // Create an InProgress instance to place in the map of all
458 // such processes if it starts correctly.
459 InProgress inprogress(filename_base, pending_, pconverter_->to);
461 // clear pending_, so we're ready to start afresh.
464 // Output the LaTeX file.
465 string const latexfile = filename_base + ".tex";
467 ofstream of(latexfile.c_str());
468 of << "\\batchmode\n";
470 of << "\n\\begin{document}\n";
471 dumpData(of, inprogress.snippets);
472 of << "\n\\end{document}\n";
475 // The conversion command.
477 cs << pconverter_->command << " " << latexfile << " "
478 << int(font_scaling_factor_);
480 string const command = LibScriptSearch(cs.str().c_str());
482 // Initiate the conversion from LaTeX to bitmap images files.
483 Forkedcall::SignalTypePtr convert_ptr;
484 convert_ptr.reset(new Forkedcall::SignalType);
486 convert_ptr->connect(
487 boost::bind(&Impl::finishedGenerating, this, _1, _2, _3));
490 int ret = call.startscript(command, convert_ptr);
493 lyxerr[Debug::GRAPHICS] << "PreviewLoader::startLoading()\n"
494 << "Unable to start process \n"
499 // Store the generation process in a list of all such processes
500 inprogress.pid = call.pid();
501 in_progress_[command] = inprogress;
505 void PreviewLoader::Impl::finishedGenerating(string const & command,
506 pid_t /* pid */, int retval)
508 string const status = retval > 0 ? "failed" : "succeeded";
509 lyxerr[Debug::GRAPHICS] << "PreviewLoader::finishedInProgress("
510 << retval << "): processing " << status
511 << " for " << command << endl;
516 InProgressProcesses::iterator git = in_progress_.find(command);
517 if (git == in_progress_.end()) {
518 lyxerr << "PreviewLoader::finishedGenerating(): unable to find "
520 << command << "!" << endl;
524 // Read the metrics file, if it exists
525 vector<double> ascent_fractions(git->second.snippets.size());
526 setAscentFractions(ascent_fractions, git->second.metrics_file);
528 // Add these newly generated bitmap files to the cache and
529 // start loading them into LyX.
530 BitmapFile::const_iterator it = git->second.snippets.begin();
531 BitmapFile::const_iterator end = git->second.snippets.end();
533 std::list<PreviewImagePtr> newimages;
535 int metrics_counter = 0;
536 for (; it != end; ++it, ++metrics_counter) {
537 string const & snip = it->first;
538 string const & file = it->second;
539 double af = ascent_fractions[metrics_counter];
541 PreviewImagePtr ptr(new PreviewImage(parent_, snip, file, af));
544 newimages.push_back(ptr);
547 // Remove the item from the list of still-executing processes.
548 in_progress_.erase(git);
550 // Tell the outside world
551 std::list<PreviewImagePtr>::const_iterator nit = newimages.begin();
552 std::list<PreviewImagePtr>::const_iterator nend = newimages.end();
553 for (; nit != nend; ++nit) {
554 imageReady(*nit->get());
559 void PreviewLoader::Impl::dumpPreamble(ostream & os) const
561 // Why on earth is Buffer::makeLaTeXFile a non-const method?
562 Buffer & tmp = const_cast<Buffer &>(buffer_);
563 // Dump the preamble only.
564 tmp.makeLaTeXFile(os, buffer_.filePath(), true, false, true);
566 // Loop over the insets in the buffer and dump all the math-macros.
567 Buffer::inset_iterator it = buffer_.inset_const_iterator_begin();
568 Buffer::inset_iterator end = buffer_.inset_const_iterator_end();
570 for (; it != end; ++it)
571 if (it->lyxCode() == Inset::MATHMACRO_CODE)
572 it->latex(&buffer_, os, true, true);
574 // All equation lables appear as "(#)" + preview.sty's rendering of
576 if (lyxrc.preview_hashed_labels)
577 os << "\\renewcommand{\\theequation}{\\#}\n";
579 // Use the preview style file to ensure that each snippet appears on a
582 << "\\usepackage[active,delayed,dvips,tightpage,showlabels,lyx]{preview}\n"
585 // This piece of PostScript magic ensures that the foreground and
586 // background colors are the same as the LyX screen.
587 string fg = lyx_gui::hexname(LColor::preview);
588 if (fg.empty()) fg = "000000";
590 string bg = lyx_gui::hexname(LColor::background);
591 if (bg.empty()) bg = "ffffff";
593 os << "\\AtBeginDocument{\\AtBeginDvi{%\n"
594 << "\\special{!userdict begin/bop-hook{//bop-hook exec\n"
595 << "<" << fg << bg << ">{255 div}forall setrgbcolor\n"
596 << "clippath fill setrgbcolor}bind def end}}}\n";
600 void PreviewLoader::Impl::dumpData(ostream & os,
601 BitmapFile const & vec) const
606 BitmapFile::const_iterator it = vec.begin();
607 BitmapFile::const_iterator end = vec.end();
609 for (; it != end; ++it) {
610 os << "\\begin{preview}\n"
612 << "\n\\end{preview}\n\n";
621 string const unique_filename(string const bufferpath)
623 static int theCounter = 0;
624 string const filename = tostr(theCounter++) + "lyxpreview";
625 return AddName(bufferpath, filename);
629 Converter const * setConverter()
631 string const from = "lyxpreview";
633 Formats::FormatList::const_iterator it = formats.begin();
634 Formats::FormatList::const_iterator end = formats.end();
636 for (; it != end; ++it) {
637 string const to = it->name();
641 Converter const * ptr = converters.getConverter(from, to);
646 static bool first = true;
649 lyxerr << "PreviewLoader::startLoading()\n"
650 << "No converter from \"lyxpreview\" format has been "
659 void setAscentFractions(vector<double> & ascent_fractions,
660 string const & metrics_file)
662 // If all else fails, then the images will have equal ascents and
664 vector<double>::iterator it = ascent_fractions.begin();
665 vector<double>::iterator end = ascent_fractions.end();
668 ifstream in(metrics_file.c_str());
670 lyxerr[Debug::GRAPHICS]
671 << "setAscentFractions(" << metrics_file << ")\n"
672 << "Unable to open file!" << endl;
678 // Tightpage dimensions affect all subsequent dimensions
682 int snippet_counter = 0;
684 // Expecting lines of the form
685 // Preview: Tightpage tp_bl_x tp_bl_y tp_tr_x tp_tr_y
686 // Preview: Snippet id ascent descent width
689 in >> preview >> type;
695 error = preview != "Preview:"
696 || (type != "Tightpage" && type != "Snippet");
700 if (type == "Tightpage") {
702 in >> dummy >> tp_descent >> dummy >> tp_ascent;
713 in >> snippet_id >> ascent >> descent >> dummy;
715 error = !in.good() || ++snippet_counter != snippet_id;
719 double const a = ascent + tp_ascent;
720 double const d = descent - tp_descent;
722 if (!lyx::float_equal(a + d, 0, 0.1))
731 lyxerr[Debug::GRAPHICS]
732 << "setAscentFractions(" << metrics_file << ")\n"
733 << "Error reading file!\n" << endl;