2 * \file GraphicsCacheItem.cpp
3 * This file is part of LyX, the document processor.
4 * Licence details can be found in the file COPYING.
8 * \author Angus Leeming
10 * Full author contact details are available in file CREDITS.
15 #include "GraphicsCacheItem.h"
17 #include "GraphicsCache.h"
18 #include "GraphicsConverter.h"
19 #include "GraphicsImage.h"
21 #include "ConverterCache.h"
24 #include "support/debug.h"
25 #include "support/FileName.h"
26 #include "support/filetools.h"
27 #include "support/FileMonitor.h"
29 #include <boost/bind.hpp>
32 using namespace lyx::support;
38 class CacheItem::Impl : public boost::signals::trackable {
42 Impl(FileName const & file);
45 * If no file conversion is needed, then tryDisplayFormat() calls
46 * loadImage() directly.
47 * \return true if a conversion is necessary.
49 bool tryDisplayFormat(FileName & filename, string & from);
51 /** Start the image conversion process, checking first that it is
52 * necessary. If it is necessary, then a conversion task is started.
53 * CacheItem asumes that the conversion is asynchronous and so
54 * passes a Signal to the converting routine. When the conversion
55 * is finished, this Signal is emitted, returning the converted
56 * file to this->imageConverted.
58 * convertToDisplayFormat() will set the loading status flag as
59 * approriate through calls to setStatus().
61 void convertToDisplayFormat();
63 /** Load the image into memory. This is called either from
64 * convertToDisplayFormat() direct or from imageConverted().
68 /** Get a notification when the image conversion is done.
69 * Connected to a signal on_finish_ which is passed to
72 void imageConverted(bool);
74 /** Sets the status of the loading process. Also notifies
75 * listeners that the status has changed.
77 void setStatus(ImageStatus new_status);
79 /** Can be invoked directly by the user, but is also connected to the
80 * FileMonitor and so is invoked when the file is changed
81 * (if monitoring is taking place).
85 /** If we are asked to load the file for a second or further time,
86 * (because the file has changed), then we'll have to first reset
87 * many of the variables below.
91 /// The filename we refer too.
92 FileName const filename_;
94 FileMonitor const monitor_;
96 /// Is the file compressed?
98 /// If so, store the uncompressed file in this temporary file.
99 FileName unzipped_filename_;
100 /// The target format
102 /// What file are we trying to load?
103 FileName file_to_load_;
104 /** Should we delete the file after loading? True if the file is
105 * the result of a conversion process.
107 bool remove_loaded_file_;
109 /// The image and its loading status.
110 boost::shared_ptr<Image> image_;
114 /// This signal is emitted when the image loading status changes.
115 boost::signal<void()> statusChanged;
117 /// The connection of the signal ConvProcess::finishedConversion,
118 boost::signals::connection cc_;
121 boost::scoped_ptr<Converter> converter_;
125 CacheItem::CacheItem(FileName const & file)
126 : pimpl_(new Impl(file))
130 CacheItem::~CacheItem()
136 FileName const & CacheItem::filename() const
138 return pimpl_->filename_;
142 bool CacheItem::tryDisplayFormat() const
144 if (pimpl_->status_ != WaitingToLoad)
148 bool const success = pimpl_->tryDisplayFormat(filename, from);
155 void CacheItem::startLoading() const
157 pimpl_->startLoading();
161 void CacheItem::startMonitoring() const
163 if (!pimpl_->monitor_.monitoring())
164 pimpl_->monitor_.start();
168 bool CacheItem::monitoring() const
170 return pimpl_->monitor_.monitoring();
174 unsigned long CacheItem::checksum() const
176 return pimpl_->monitor_.checksum();
180 Image const * CacheItem::image() const
182 return pimpl_->image_.get();
186 ImageStatus CacheItem::status() const
188 return pimpl_->status_;
192 boost::signals::connection CacheItem::connect(slot_type const & slot) const
194 return pimpl_->statusChanged.connect(slot);
198 //------------------------------
199 // Implementation details follow
200 //------------------------------
203 CacheItem::Impl::Impl(FileName const & file)
205 monitor_(file, 2000),
207 remove_loaded_file_(false),
208 status_(WaitingToLoad)
210 monitor_.connect(boost::bind(&Impl::startLoading, this));
214 void CacheItem::Impl::startLoading()
216 if (status_ != WaitingToLoad)
219 convertToDisplayFormat();
223 void CacheItem::Impl::reset()
226 if (!unzipped_filename_.empty())
227 unzipped_filename_.removeFile();
228 unzipped_filename_.erase();
230 if (remove_loaded_file_ && !file_to_load_.empty())
231 file_to_load_.removeFile();
232 remove_loaded_file_ = false;
233 file_to_load_.erase();
239 status_ = WaitingToLoad;
244 if (converter_.get())
249 void CacheItem::Impl::setStatus(ImageStatus new_status)
251 if (status_ == new_status)
254 status_ = new_status;
259 void CacheItem::Impl::imageConverted(bool success)
261 string const text = success ? "succeeded" : "failed";
262 LYXERR(Debug::GRAPHICS, "Image conversion " << text << '.');
264 file_to_load_ = converter_.get() ?
265 FileName(converter_->convertedFile()) : FileName();
269 success = !file_to_load_.empty() && file_to_load_.isReadableFile();
272 LYXERR(Debug::GRAPHICS, "Unable to find converted file!");
273 setStatus(ErrorConverting);
276 unzipped_filename_.removeFile();
281 // Add the converted file to the file cache
282 ConverterCache::get().add(filename_, to_, file_to_load_);
284 setStatus(loadImage() ? Loaded : ErrorLoading);
288 // This function gets called from the callback after the image has been
289 // converted successfully.
290 bool CacheItem::Impl::loadImage()
292 LYXERR(Debug::GRAPHICS, "Loading image.");
294 image_.reset(Image::newImage());
296 bool success = image_->load(file_to_load_);
297 string const text = success ? "succeeded" : "failed";
298 LYXERR(Debug::GRAPHICS, "Image loading " << text << '.');
300 // Clean up after loading.
302 unzipped_filename_.removeFile();
304 if (remove_loaded_file_ && unzipped_filename_ != file_to_load_)
305 file_to_load_.removeFile();
311 static string const findTargetFormat(string const & from)
313 typedef vector<string> FormatList;
314 FormatList const & formats = Cache::get().loadableFormats();
316 // There must be a format to load from.
317 LASSERT(!formats.empty(), /**/);
319 // Use the standard converter if we don't know the format to load
322 return string("ppm");
324 // First ascertain if we can load directly with no conversion
325 FormatList::const_iterator it = formats.begin();
326 FormatList::const_iterator end = formats.end();
327 for (; it != end; ++it) {
332 // So, we have to convert to a loadable format. Can we?
333 it = formats.begin();
334 for (; it != end; ++it) {
335 if (lyx::graphics::Converter::isReachable(from, *it))
338 LYXERR(Debug::GRAPHICS, "Unable to convert from " << from
342 // Failed! so we have to try to convert it to PPM format
343 // with the standard converter
344 return string("ppm");
348 bool CacheItem::Impl::tryDisplayFormat(FileName & filename, string & from)
350 // First, check that the file exists!
351 if (!filename_.isReadableFile()) {
352 if (status_ != ErrorNoFile) {
353 status_ = ErrorNoFile;
354 LYXERR(Debug::GRAPHICS, "\tThe file is not readable");
359 zipped_ = filename_.isZippedFile();
361 unzipped_filename_ = FileName::tempName(
362 filename_.toFilesystemEncoding());
363 if (unzipped_filename_.empty()) {
364 status_ = ErrorConverting;
365 LYXERR(Debug::GRAPHICS, "\tCould not create temporary file.");
368 filename = unzipFile(filename_, unzipped_filename_.toFilesystemEncoding());
370 filename = filename_;
373 docstring const displayed_filename = makeDisplayPath(filename_.absFilename());
374 LYXERR(Debug::GRAPHICS, "[CacheItem::Impl::convertToDisplayFormat]\n"
375 << "\tAttempting to convert image file: " << filename
376 << "\n\twith displayed filename: " << to_utf8(displayed_filename));
378 from = formats.getFormatFromFile(filename);
380 status_ = ErrorConverting;
381 LYXERR(Debug::GRAPHICS, "\tCould not determine file format.");
383 LYXERR(Debug::GRAPHICS, "\n\tThe file contains " << from << " format data.");
384 to_ = findTargetFormat(from);
387 // No conversion needed!
388 LYXERR(Debug::GRAPHICS, "\tNo conversion needed (from == to)!");
389 file_to_load_ = filename;
390 status_ = loadImage() ? Loaded : ErrorLoading;
394 if (ConverterCache::get().inCache(filename, to_)) {
395 LYXERR(Debug::GRAPHICS, "\tNo conversion needed (file in file cache)!");
396 file_to_load_ = ConverterCache::get().cacheName(filename, to_);
397 status_ = loadImage() ? Loaded : ErrorLoading;
404 void CacheItem::Impl::convertToDisplayFormat()
406 LYXERR(Debug::GRAPHICS, "\tConverting it to " << to_ << " format.");
408 // Make a local copy in case we unzip it
411 if (tryDisplayFormat(filename, from)) {
412 // The image status has changed, tell it to the outside world.
417 // We will need a conversion, tell it to the outside world.
418 setStatus(Converting);
420 // Add some stuff to create a uniquely named temporary file.
421 // This file is deleted in loadImage after it is loaded into memory.
422 FileName const to_file_base = FileName::tempName("CacheItem");
423 remove_loaded_file_ = true;
425 // Connect a signal to this->imageConverted and pass this signal to
426 // the graphics converter so that we can load the modified file
427 // on completion of the conversion process.
428 converter_.reset(new Converter(filename, to_file_base.absFilename(), from, to_));
429 converter_->connect(boost::bind(&Impl::imageConverted, this, _1));
430 converter_->startConversion();
433 } // namespace graphics