src/frontends/qt4/GuiImage.cpp

   1 /**
   2  * \file GuiImage.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  * \author John Levon
   8  *
   9  * Full author contact details are available in file CREDITS.
  10  */
  11
  12 #include <config.h>
  13
  14 #include "GuiImage.h"
  15 #include "qt_helpers.h"
  16
  17 #include "debug.h"
  18 #include "Format.h"
  19
  20 #include "graphics/GraphicsParams.h"
  21
  22 #include "support/FileName.h"
  23 #include "support/lstrings.h"       // ascii_lowercase
  24
  25 #include <QPainter>
  26 #include <QPictureIO>
  27 #include <QPicture>
  28 #include <QImage>
  29 #include <QImageReader>
  30
  31 #include <boost/bind.hpp>
  32 #include <boost/tuple/tuple.hpp>
  33
  34 using lyx::support::ascii_lowercase;
  35
  36 using boost::bind;
  37
  38 using std::endl;
  39 using std::equal_to;
  40 using std::find_if;
  41 using std::string;
  42
  43 QPictureIO StaticPicture;
  44
  45 namespace lyx {
  46 namespace graphics {
  47
  48 /// Access to this class is through this static method.
  49 Image::ImagePtr GuiImage::newImage()
  50 {
  51         ImagePtr ptr;
  52         ptr.reset(new GuiImage);
  53         return ptr;
  54 }
  55
  56
  57 /// Return the list of loadable formats.
  58 Image::FormatList GuiImage::loadableFormats()
  59 {
  60         static FormatList fmts;
  61
  62         if (!fmts.empty())
  63                 return fmts;
  64
  65         // The formats recognised by LyX
  66         Formats::const_iterator begin = formats.begin();
  67         Formats::const_iterator end   = formats.end();
  68
  69
  70 //      LYXERR(Debug::GRAPHICS)
  71 //              << "D:/msys/home/yns/src/lyx-devel/lib/images/banner.png mis of format: "
  72 //              << fromqstr(Pic.pictureFormat("D:/msys/home/yns/src/lyx-devel/lib/images/banner.png"))
  73 //              << endl;
  74 //      if (Pic.pictureFormat("D:/msys/home/yns/src/lyx-devel/lib/images/banner.png"))
  75 //              LYXERR(Debug::GRAPHICS)
  76 //                      << "pictureFormat not returned NULL\n" << endl;
  77 //                      << "Supported formats are: " << Pic.inputFormats() << endl;
  78
  79         QList<QByteArray> qt_formats = QImageReader::supportedImageFormats ();
  80
  81         LYXERR(Debug::GRAPHICS)
  82                 << "\nThe image loader can load the following directly:\n";
  83
  84         if (qt_formats.empty())
  85                 LYXERR(Debug::GRAPHICS)
  86                         << "\nQt4 Problem: No Format available!" << endl;
  87
  88         for (QList<QByteArray>::const_iterator it =qt_formats.begin(); it != qt_formats.end(); ++it) {
  89
  90                 LYXERR(Debug::GRAPHICS) << (const char *) *it << ", ";
  91
  92                 string ext = ascii_lowercase((const char *) *it);
  93
  94                 // special case
  95                 if (ext == "jpeg")
  96                         ext = "jpg";
  97
  98                 Formats::const_iterator fit =
  99                         find_if(begin, end,
 100                                 bind(equal_to<string>(),
 101                                      bind(&Format::extension, _1),
 102                                      ext));
 103                 if (fit != end)
 104                         fmts.push_back(fit->name());
 105         }
 106
 107         if (lyxerr.debugging()) {
 108                 LYXERR(Debug::GRAPHICS)
 109                         << "\nOf these, LyX recognises the following formats:\n";
 110
 111                 FormatList::const_iterator fbegin = fmts.begin();
 112                 FormatList::const_iterator fend   = fmts.end();
 113                 for (FormatList::const_iterator fit = fbegin; fit != fend; ++fit) {
 114                         if (fit != fbegin)
 115                                 LYXERR(Debug::GRAPHICS) << ", ";
 116                         LYXERR(Debug::GRAPHICS) << *fit;
 117                 }
 118                 LYXERR(Debug::GRAPHICS) << '\n' << endl;
 119         }
 120
 121         return fmts;
 122 }
 123
 124
 125 GuiImage::GuiImage(GuiImage const & other)
 126         : Image(other), original_(other.original_),
 127           transformed_(other.transformed_),
 128           transformed_pixmap_(other.transformed_pixmap_)
 129 {}
 130
 131
 132 Image * GuiImage::clone_impl() const
 133 {
 134         return new GuiImage(*this);
 135 }
 136
 137
 138 unsigned int GuiImage::getWidth_impl() const
 139 {
 140         return transformed_.width();
 141 }
 142
 143
 144 unsigned int GuiImage::getHeight_impl() const
 145 {
 146         return transformed_.height();
 147 }
 148
 149
 150 void GuiImage::load_impl(support::FileName const & filename)
 151 {
 152         if (!original_.isNull()) {
 153                 LYXERR(Debug::GRAPHICS)
 154                         << "Image is loaded already!" << endl;
 155                 finishedLoading(false);
 156                 return;
 157         }
 158
 159         if (!original_.load(toqstr(filename.absFilename()))) {
 160                 LYXERR(Debug::GRAPHICS)
 161                         << "Unable to open image" << endl;
 162                 finishedLoading(false);
 163                 return;
 164         }
 165         transformed_ = original_;
 166         finishedLoading(true);
 167 }
 168
 169
 170 namespace {
 171
 172 // This code is taken from KImageEffect::toGray
 173 QImage & toGray(QImage & img)
 174 {
 175         if (img.width() == 0 || img.height() == 0)
 176                 return img;
 177
 178         int const pixels = img.depth() > 8 ?
 179                 img.width() * img.height() : img.numColors();
 180
 181         unsigned int *data = img.depth() > 8 ?
 182                 reinterpret_cast<unsigned int *>(img.bits()) :
 183                 reinterpret_cast<unsigned int *>(&img.colorTable()[0]);
 184
 185         for(int i = 0; i < pixels; ++i){
 186                 int const val = qGray(data[i]);
 187                 data[i] = qRgba(val, val, val, qAlpha(data[i]));
 188         }
 189         return img;
 190 }
 191
 192 } // namespace anon
 193
 194
 195 bool GuiImage::setPixmap_impl(Params const & params)
 196 {
 197         if (original_.isNull() || params.display == NoDisplay)
 198                 return false;
 199
 200         switch (params.display) {
 201         case GrayscaleDisplay: {
 202                 toGray(transformed_);
 203                 break;
 204         }
 205
 206         case MonochromeDisplay: {
 207                 transformed_.convertToFormat(transformed_.format(), Qt::MonoOnly);
 208                 break;
 209         }
 210
 211         default:
 212                 break;
 213         }
 214
 215         transformed_pixmap_ = QPixmap::fromImage(transformed_);
 216         return true;
 217 }
 218
 219
 220 void GuiImage::clip_impl(Params const & params)
 221 {
 222         if (transformed_.isNull())
 223                 return;
 224
 225         if (params.bb.empty())
 226                 // No clipping is necessary.
 227                 return;
 228
 229         int const new_width  = params.bb.xr - params.bb.xl;
 230         int const new_height = params.bb.yt - params.bb.yb;
 231
 232         // No need to check if the width, height are > 0 because the
 233         // Bounding Box would be empty() in this case.
 234         if (new_width > original_.width() || new_height > original_.height()) {
 235                 // Bounds are invalid.
 236                 return;
 237         }
 238
 239         if (new_width == original_.width() && new_height == original_.height())
 240                 return;
 241
 242         int const xoffset_l = params.bb.xl;
 243         int const yoffset_t = (original_.height() > int(params.bb.yt) ?
 244                                original_.height() - params.bb.yt : 0);
 245
 246         transformed_ = original_.copy(xoffset_l, yoffset_t,
 247                                       new_width, new_height);
 248 }
 249
 250
 251 void GuiImage::rotate_impl(Params const & params)
 252 {
 253         if (transformed_.isNull())
 254                 return;
 255
 256         if (!params.angle)
 257                 return;
 258
 259         QMatrix m;
 260         m.rotate(-params.angle);
 261
 262         transformed_ = transformed_.transformed(m);
 263 }
 264
 265
 266 void GuiImage::scale_impl(Params const & params)
 267 {
 268         if (transformed_.isNull())
 269                 return;
 270
 271         unsigned int width;
 272         unsigned int height;
 273         boost::tie(width, height) = getScaledDimensions(params);
 274
 275         if (width == getWidth() && height == getHeight())
 276                 return;
 277
 278         QMatrix m;
 279         m.scale(double(width) / getWidth(), double(height) / getHeight());
 280         transformed_ = transformed_.transformed(m);
 281 }
 282
 283 } // namespace graphics
 284 } // lyx