src/frontends/qt3/QLImage.C

   1 /**
   2  * \file QLImage.C
   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 "QLImage.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/lstrings.h"       // lowercase
  23
  24 #include <qimage.h>
  25 #include <qpainter.h>
  26
  27 #include <boost/bind.hpp>
  28 #include <boost/tuple/tuple.hpp>
  29
  30 using lyx::support::lowercase;
  31
  32 using boost::bind;
  33
  34 using std::endl;
  35 using std::equal_to;
  36 using std::find_if;
  37 using std::string;
  38
  39
  40 namespace lyx {
  41 namespace graphics {
  42
  43 /// Access to this class is through this static method.
  44 Image::ImagePtr QLImage::newImage()
  45 {
  46         ImagePtr ptr;
  47         ptr.reset(new QLImage);
  48         return ptr;
  49 }
  50
  51
  52 /// Return the list of loadable formats.
  53 Image::FormatList QLImage::loadableFormats()
  54 {
  55         static FormatList fmts;
  56
  57         if (!fmts.empty())
  58                 return fmts;
  59
  60         // The formats recognised by LyX
  61         Formats::const_iterator begin = formats.begin();
  62         Formats::const_iterator end   = formats.end();
  63
  64         lyxerr[Debug::GRAPHICS]
  65                 << "\nThe image loader can load the following directly:\n";
  66
  67         QStrList qt_formats = QImageIO::inputFormats();
  68
  69         QStrListIterator it(qt_formats);
  70
  71         for (; it.current(); ++it) {
  72                 lyxerr[Debug::GRAPHICS] << it.current() << endl;
  73
  74                 string ext = lowercase(it.current());
  75
  76                 // special case
  77                 if (ext == "jpeg")
  78                         ext = "jpg";
  79
  80                 Formats::const_iterator fit =
  81                         find_if(begin, end,
  82                                 bind(equal_to<string>(),
  83                                      bind(&Format::extension, _1),
  84                                      ext));
  85                 if (fit != end)
  86                         fmts.push_back(fit->name());
  87         }
  88
  89         if (lyxerr.debugging()) {
  90                 lyxerr[Debug::GRAPHICS]
  91                         << "\nOf these, LyX recognises the following formats:\n";
  92
  93                 FormatList::const_iterator fbegin = fmts.begin();
  94                 FormatList::const_iterator fend   = fmts.end();
  95                 for (FormatList::const_iterator fit = fbegin; fit != fend; ++fit) {
  96                         if (fit != fbegin)
  97                                 lyxerr[Debug::GRAPHICS] << ", ";
  98                         lyxerr[Debug::GRAPHICS] << *fit;
  99                 }
 100                 lyxerr[Debug::GRAPHICS] << '\n' << endl;
 101         }
 102
 103         return fmts;
 104 }
 105
 106
 107 QLImage::QLImage()
 108         : Image()
 109 {
 110 }
 111
 112
 113 QLImage::QLImage(QLImage const & other)
 114         : Image(other), original_(other.original_),
 115           transformed_(other.transformed_),
 116           transformed_pixmap_(other.transformed_pixmap_)
 117 {}
 118
 119
 120 Image * QLImage::clone_impl() const
 121 {
 122         return new QLImage(*this);
 123 }
 124
 125
 126 unsigned int QLImage::getWidth_impl() const
 127 {
 128         return transformed_.width();
 129 }
 130
 131
 132 unsigned int QLImage::getHeight_impl() const
 133 {
 134         return transformed_.height();
 135 }
 136
 137
 138 void QLImage::load_impl(string const & filename)
 139 {
 140         if (!original_.isNull()) {
 141                 lyxerr[Debug::GRAPHICS]
 142                         << "Image is loaded already!" << endl;
 143                 finishedLoading(false);
 144                 return;
 145         }
 146
 147         if (!original_.load(toqstr(filename))) {
 148                 lyxerr[Debug::GRAPHICS]
 149                         << "Unable to open image" << endl;
 150                 finishedLoading(false);
 151                 return;
 152         }
 153         transformed_ = original_;
 154         finishedLoading(true);
 155 }
 156
 157
 158 namespace {
 159
 160 // This code is taken from KImageEffect::toGray
 161 QImage & toGray(QImage & img)
 162 {
 163         if (img.width() == 0 || img.height() == 0)
 164                 return img;
 165
 166         int const pixels = img.depth() > 8 ?
 167                 img.width() * img.height() : img.numColors();
 168
 169         unsigned int * const data = img.depth() > 8 ?
 170                 (unsigned int *)img.bits() :
 171                 (unsigned int *)img.colorTable();
 172
 173         for(int i = 0; i < pixels; ++i){
 174                 int const val = qGray(data[i]);
 175                 data[i] = qRgba(val, val, val, qAlpha(data[i]));
 176         }
 177         return img;
 178 }
 179
 180 } // namespace anon
 181
 182
 183 bool QLImage::setPixmap_impl(Params const & params)
 184 {
 185         if (original_.isNull() || params.display == NoDisplay)
 186                 return false;
 187
 188         switch (params.display) {
 189         case GrayscaleDisplay: {
 190                 toGray(transformed_);
 191                 break;
 192         }
 193
 194         case MonochromeDisplay: {
 195                 transformed_.convertDepth(transformed_.depth(), Qt::MonoOnly);
 196                 break;
 197         }
 198
 199         default:
 200                 break;
 201         }
 202
 203         transformed_pixmap_ = transformed_;
 204         return true;
 205 }
 206
 207
 208 void QLImage::clip_impl(Params const & params)
 209 {
 210         if (transformed_.isNull())
 211                 return;
 212
 213         if (params.bb.empty())
 214                 // No clipping is necessary.
 215                 return;
 216
 217         int const new_width  = params.bb.xr - params.bb.xl;
 218         int const new_height = params.bb.yt - params.bb.yb;
 219
 220         // No need to check if the width, height are > 0 because the
 221         // Bounding Box would be empty() in this case.
 222         if (new_width > original_.width() || new_height > original_.height()) {
 223                 // Bounds are invalid.
 224                 return;
 225         }
 226
 227         if (new_width == original_.width() && new_height == original_.height())
 228                 return;
 229
 230         int const xoffset_l = params.bb.xl;
 231         int const yoffset_t = (original_.height() > int(params.bb.yt) ?
 232                                original_.height() - params.bb.yt : 0);
 233
 234         transformed_ = original_.copy(xoffset_l, yoffset_t,
 235                                       new_width, new_height);
 236 }
 237
 238
 239 void QLImage::rotate_impl(Params const & params)
 240 {
 241         if (transformed_.isNull())
 242                 return;
 243
 244         if (!params.angle)
 245                 return;
 246
 247         QWMatrix m;
 248         m.rotate(-params.angle);
 249
 250         transformed_.setAlphaBuffer(true);
 251         transformed_ = transformed_.xForm(m);
 252 }
 253
 254
 255 void QLImage::scale_impl(Params const & params)
 256 {
 257         if (transformed_.isNull())
 258                 return;
 259
 260         unsigned int width;
 261         unsigned int height;
 262         boost::tie(width, height) = getScaledDimensions(params);
 263
 264         if (width == getWidth() && height == getHeight())
 265                 return;
 266
 267         QWMatrix m;
 268         m.scale(double(width) / getWidth(), double(height) / getHeight());
 269         transformed_ = transformed_.xForm(m);
 270 }
 271
 272 } // namespace graphics
 273 } // lyx