1 /**
2 * \file PreviewImage.cpp
3 * This file is part of LyX, the document processor.
4 * Licence details can be found in the file COPYING.
5 *
6 * \author Angus Leeming
7 *
8 * Full author contact details are available in file CREDITS.
9 */
10
11 #include <config.h>
12
13 #include "PreviewImage.h"
14
15 #include "Buffer.h"
16 #include "Dimension.h"
17 #include "GraphicsImage.h"
18 #include "GraphicsLoader.h"
19 #include "PreviewLoader.h"
20
21 #include "support/FileName.h"
22
23
24 using namespace std;
25 using namespace lyx::support;
26
27 namespace lyx {
28 namespace graphics {
29
30 class PreviewImage::Impl {
31 public:
32 ///
33 Impl(PreviewImage & p, PreviewLoader & l,
34 string const & s, FileName const & f, double af);
35 ///
36 ~Impl();
37 ///
38 Image const * image();
39 ///
40 void statusChanged();
41
42 ///
43 PreviewImage const & parent_;
44 ///
45 PreviewLoader & ploader_;
46 ///
47 Loader iloader_;
48 ///
49 string const snippet_;
50 ///
51 double const ascent_frac_;
52 };
53
54
PreviewImage(PreviewLoader & l,string const & s,FileName const & f,double af)55 PreviewImage::PreviewImage(PreviewLoader & l,
56 string const & s,
57 FileName const & f,
58 double af)
59 : pimpl_(new Impl(*this, l, s, f, af))
60 {}
61
62
~PreviewImage()63 PreviewImage::~PreviewImage()
64 {
65 delete pimpl_;
66 }
67
68
snippet() const69 string const & PreviewImage::snippet() const
70 {
71 return pimpl_->snippet_;
72 }
73
74
filename() const75 support::FileName const & PreviewImage::filename() const
76 {
77 return pimpl_->iloader_.filename();
78 }
79
80
dim() const81 Dimension PreviewImage::dim() const
82 {
83 Dimension dim;
84 Image const * const image = pimpl_->iloader_.image();
85 if (!image)
86 return dim;
87
88 dim.asc = int(pimpl_->ascent_frac_ * double(image->height()) + 0.5);
89 dim.des = image->height() - dim.asc;
90 dim.wid = image->width();
91 return dim;
92 }
93
94
image() const95 Image const * PreviewImage::image() const
96 {
97 return pimpl_->image();
98 }
99
100
previewLoader() const101 PreviewLoader & PreviewImage::previewLoader() const
102 {
103 return pimpl_->ploader_;
104 }
105
106
Impl(PreviewImage & p,PreviewLoader & l,string const & s,FileName const & bf,double af)107 PreviewImage::Impl::Impl(PreviewImage & p, PreviewLoader & l, string const & s,
108 FileName const & bf, double af)
109 : parent_(p), ploader_(l), iloader_(l.buffer().fileName(), bf),
110 snippet_(s), ascent_frac_(af)
111 {
112 iloader_.setDisplayPixelRatio(l.displayPixelRatio());
113 // This connection is destroyed at the same time as this.
114 iloader_.connect([this](){ statusChanged(); });
115 }
116
117
~Impl()118 PreviewImage::Impl::~Impl()
119 {
120 // If these images are generated for a clone, then that may be
121 // because we are previewing. We therefore do not want to delete
122 // them when this Buffer is destroyed.
123 if (!ploader_.buffer().isClone())
124 iloader_.filename().removeFile();
125 }
126
127
image()128 Image const * PreviewImage::Impl::image()
129 {
130 if (iloader_.status() == WaitingToLoad)
131 iloader_.startLoading();
132
133 return iloader_.image();
134 }
135
136
statusChanged()137 void PreviewImage::Impl::statusChanged()
138 {
139 switch (iloader_.status()) {
140 case WaitingToLoad:
141 case Loading:
142 case Converting:
143 case Loaded:
144 case ScalingEtc:
145 break;
146
147 case ErrorNoFile:
148 case ErrorConverting:
149 case ErrorLoading:
150 case ErrorGeneratingPixmap:
151 case ErrorUnknown:
152 //iloader_.filename().removeFile();
153 ploader_.remove(snippet_);
154 // FIXME: We need to return here, because PreviewLoader::remove
155 // removes the preview image from the cache, which deletes this
156 // object, so we should not try to do anything here.
157 return;
158
159 case Ready:
160 iloader_.filename().removeFile();
161 break;
162 }
163 ploader_.emitSignal(parent_);
164 }
165
166 } // namespace graphics
167 } // namespace lyx
168