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f9bff2d9b1
Add display_pixel_ratio to buffer params to use it for displays with high resolution. It holds the highest ratio between physical pixels and device-independent pixels of the LyX application. Preview snippets will be generated using this value to get high resolution preview.
159 lines
2.8 KiB
C++
159 lines
2.8 KiB
C++
/**
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* \file PreviewImage.cpp
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* This file is part of LyX, the document processor.
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* Licence details can be found in the file COPYING.
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*
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* \author Angus Leeming
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*
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* Full author contact details are available in file CREDITS.
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*/
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#include <config.h>
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#include "PreviewImage.h"
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#include "Dimension.h"
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#include "GraphicsImage.h"
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#include "GraphicsLoader.h"
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#include "PreviewLoader.h"
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#include "support/FileName.h"
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#include "support/bind.h"
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using namespace std;
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using namespace lyx::support;
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namespace lyx {
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namespace graphics {
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class PreviewImage::Impl : public boost::signals::trackable {
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public:
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///
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Impl(PreviewImage & p, PreviewLoader & l,
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string const & s, FileName const & f, double af);
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///
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~Impl();
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///
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Image const * image();
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///
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void statusChanged();
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///
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PreviewImage const & parent_;
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///
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PreviewLoader & ploader_;
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///
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Loader iloader_;
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///
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string const snippet_;
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///
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double const ascent_frac_;
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};
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PreviewImage::PreviewImage(PreviewLoader & l,
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string const & s,
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FileName const & f,
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double af)
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: pimpl_(new Impl(*this, l, s, f, af))
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{}
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PreviewImage::~PreviewImage()
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{
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delete pimpl_;
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}
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string const & PreviewImage::snippet() const
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{
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return pimpl_->snippet_;
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}
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support::FileName const & PreviewImage::filename() const
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{
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return pimpl_->iloader_.filename();
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}
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Dimension PreviewImage::dim() const
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{
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Dimension dim;
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Image const * const image = pimpl_->iloader_.image();
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if (!image)
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return dim;
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dim.asc = int(pimpl_->ascent_frac_ * double(image->height()));
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dim.des = image->height() - dim.asc;
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dim.wid = image->width();
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return dim;
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}
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Image const * PreviewImage::image() const
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{
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return pimpl_->image();
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}
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PreviewImage::Impl::Impl(PreviewImage & p, PreviewLoader & l,
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string const & s,
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FileName const & bf,
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double af)
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: parent_(p), ploader_(l), iloader_(bf),
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snippet_(s), ascent_frac_(af)
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{
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iloader_.setDisplayPixelRatio(l.displayPixelRatio());
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iloader_.connect(bind(&Impl::statusChanged, this));
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}
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PreviewImage::Impl::~Impl()
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{
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iloader_.filename().removeFile();
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}
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Image const * PreviewImage::Impl::image()
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{
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if (iloader_.status() == WaitingToLoad)
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iloader_.startLoading();
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return iloader_.image();
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}
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void PreviewImage::Impl::statusChanged()
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{
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switch (iloader_.status()) {
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case WaitingToLoad:
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case Loading:
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case Converting:
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case Loaded:
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case ScalingEtc:
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break;
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case ErrorNoFile:
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case ErrorConverting:
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case ErrorLoading:
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case ErrorGeneratingPixmap:
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case ErrorUnknown:
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//iloader_.filename().removeFile();
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ploader_.remove(snippet_);
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// FIXME: We need to return here, because PreviewLoader::remove
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// removes the preview image from the cache, which deletes this
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// object, so we should not try to do anything here.
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return;
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case Ready:
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iloader_.filename().removeFile();
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break;
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}
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ploader_.emitSignal(parent_);
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}
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} // namespace graphics
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} // namespace lyx
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