src/frontends/qt2/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.original_)
 116 {}
 117
 118
 119 QLImage::~QLImage()
 120 {
 121 }
 122
 123
 124 Image * QLImage::clone_impl() const
 125 {
 126         return new QLImage(*this);
 127 }
 128
 129
 130 unsigned int QLImage::getWidth_impl() const
 131 {
 132         return transformed_.width();
 133 }
 134
 135
 136 unsigned int QLImage::getHeight_impl() const
 137 {
 138         return transformed_.height();
 139 }
 140
 141
 142 void QLImage::load_impl(string const & filename)
 143 {
 144         if (!original_.isNull()) {
 145                 lyxerr[Debug::GRAPHICS]
 146                         << "Image is loaded already!" << endl;
 147                 finishedLoading(false);
 148                 return;
 149         }
 150
 151         if (!original_.load(toqstr(filename))) {
 152                 lyxerr[Debug::GRAPHICS]
 153                         << "Unable to open image" << endl;
 154                 finishedLoading(false);
 155                 return;
 156         }
 157         transformed_ = original_;
 158         finishedLoading(true);
 159 }
 160
 161
 162 namespace {
 163
 164 // This code is taken from KImageEffect::toGray
 165 QImage & toGray(QImage & img)
 166 {
 167         if (img.width() == 0 || img.height() == 0)
 168                 return img;
 169
 170         int const pixels = img.depth() > 8 ?
 171                 img.width() * img.height() : img.numColors();
 172
 173         unsigned int * const data = img.depth() > 8 ?
 174                 (unsigned int *)img.bits() :
 175                 (unsigned int *)img.colorTable();
 176
 177         for(int i = 0; i < pixels; ++i){
 178                 int const val = qGray(data[i]);
 179                 data[i] = qRgba(val, val, val, qAlpha(data[i]));
 180         }
 181         return img;
 182 }
 183
 184 } // namespace anon
 185
 186
 187 bool QLImage::setPixmap_impl(Params const & params)
 188 {
 189         if (original_.isNull() || params.display == NoDisplay)
 190                 return false;
 191
 192         switch (params.display) {
 193         case GrayscaleDisplay: {
 194                 toGray(transformed_);
 195                 break;
 196         }
 197
 198         case MonochromeDisplay: {
 199                 transformed_.convertDepth(transformed_.depth(), Qt::MonoOnly);
 200                 break;
 201         }
 202
 203         default:
 204                 break;
 205         }
 206
 207         return true;
 208 }
 209
 210
 211 void QLImage::clip_impl(Params const & params)
 212 {
 213         if (transformed_.isNull())
 214                 return;
 215
 216         if (params.bb.empty())
 217                 // No clipping is necessary.
 218                 return;
 219
 220         int const new_width  = params.bb.xr - params.bb.xl;
 221         int const new_height = params.bb.yt - params.bb.yb;
 222
 223         // No need to check if the width, height are > 0 because the
 224         // Bounding Box would be empty() in this case.
 225         if (new_width > original_.width() || new_height > original_.height()) {
 226                 // Bounds are invalid.
 227                 return;
 228         }
 229
 230         if (new_width == original_.width() && new_height == original_.height())
 231                 return;
 232
 233         int const xoffset_l = params.bb.xl;
 234         int const yoffset_t = (original_.height() > int(params.bb.yt) ?
 235                                original_.height() - params.bb.yt : 0);
 236
 237         transformed_ = original_.copy(xoffset_l, yoffset_t,
 238                                       new_width, new_height);
 239 }
 240
 241
 242 void QLImage::rotate_impl(Params const & params)
 243 {
 244         if (transformed_.isNull())
 245                 return;
 246
 247         if (!params.angle)
 248                 return;
 249
 250         QWMatrix m;
 251         m.rotate(-params.angle);
 252
 253         transformed_.setAlphaBuffer(true);
 254         transformed_ = transformed_.xForm(m);
 255 }
 256
 257
 258 void QLImage::scale_impl(Params const & params)
 259 {
 260         if (transformed_.isNull())
 261                 return;
 262
 263         unsigned int width;
 264         unsigned int height;
 265         boost::tie(width, height) = getScaledDimensions(params);
 266
 267         if (width == getWidth() && height == getHeight())
 268                 return;
 269
 270         QWMatrix m;
 271         m.scale(double(width) / getWidth(), double(height) / getHeight());
 272         transformed_ = transformed_.xForm(m);
 273 }
 274
 275 } // namespace graphics
 276 } // lyx