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 "debug.h"
  15 #include "QLImage.h"
  16 #include "graphics/GraphicsParams.h"
  17 #include "format.h"
  18 #include "support/lstrings.h"       // lowercase
  19 #include "support/lyxfunctional.h"  // compare_memfun
  20 #include "qt_helpers.h"
  21
  22 #include <qimage.h>
  23 #include <qpainter.h>
  24
  25 #include <boost/tuple/tuple.hpp>
  26
  27 using lyx::support::lowercase;
  28
  29 using std::endl;
  30 using std::find_if;
  31 using std::string;
  32
  33
  34 namespace lyx {
  35 namespace graphics {
  36
  37 /// Access to this class is through this static method.
  38 Image::ImagePtr QLImage::newImage()
  39 {
  40         ImagePtr ptr;
  41         ptr.reset(new QLImage);
  42         return ptr;
  43 }
  44
  45
  46 /// Return the list of loadable formats.
  47 Image::FormatList QLImage::loadableFormats()
  48 {
  49         static FormatList fmts;
  50
  51         if (!fmts.empty())
  52                 return fmts;
  53
  54         // The formats recognised by LyX
  55         Formats::const_iterator begin = formats.begin();
  56         Formats::const_iterator end   = formats.end();
  57
  58         lyxerr[Debug::GRAPHICS]
  59                 << "\nThe image loader can load the following directly:\n";
  60
  61         QStrList qt_formats = QImageIO::inputFormats();
  62
  63         QStrListIterator it(qt_formats);
  64
  65         for (; it.current(); ++it) {
  66                 lyxerr[Debug::GRAPHICS] << it.current() << endl;
  67
  68                 string ext = lowercase(it.current());
  69
  70                 // special case
  71                 if (ext == "jpeg")
  72                         ext = "jpg";
  73
  74                 Formats::const_iterator fit =
  75                         find_if(begin, end, lyx::compare_memfun(&Format::extension, ext));
  76                 if (fit != end)
  77                         fmts.push_back(fit->name());
  78         }
  79
  80         if (lyxerr.debugging()) {
  81                 lyxerr[Debug::GRAPHICS]
  82                         << "\nOf these, LyX recognises the following formats:\n";
  83
  84                 FormatList::const_iterator fbegin = fmts.begin();
  85                 FormatList::const_iterator fend   = fmts.end();
  86                 for (FormatList::const_iterator fit = fbegin; fit != fend; ++fit) {
  87                         if (fit != fbegin)
  88                                 lyxerr[Debug::GRAPHICS] << ", ";
  89                         lyxerr[Debug::GRAPHICS] << *fit;
  90                 }
  91                 lyxerr[Debug::GRAPHICS] << '\n' << endl;
  92         }
  93
  94         return fmts;
  95 }
  96
  97
  98 QLImage::QLImage()
  99         : Image()
 100 {
 101 }
 102
 103
 104 QLImage::QLImage(QLImage const & other)
 105         : Image(other), pixmap_(other.pixmap_),
 106           xformed_pixmap_(other.xformed_pixmap_)
 107 {
 108 }
 109
 110
 111 QLImage::~QLImage()
 112 {
 113 }
 114
 115
 116 Image * QLImage::clone_impl() const
 117 {
 118         return new QLImage(*this);
 119 }
 120
 121
 122 unsigned int QLImage::getWidth_impl() const
 123 {
 124         return xformed_pixmap_.width();
 125 }
 126
 127
 128 unsigned int QLImage::getHeight_impl() const
 129 {
 130         return xformed_pixmap_.height();
 131 }
 132
 133
 134 void QLImage::load_impl(string const & filename)
 135 {
 136         if (!pixmap_.isNull()) {
 137                 lyxerr[Debug::GRAPHICS]
 138                         << "Image is loaded already!" << endl;
 139                 finishedLoading(false);
 140                 return;
 141         }
 142
 143         if (!pixmap_.load(toqstr(filename))) {
 144                 lyxerr[Debug::GRAPHICS]
 145                         << "Unable to open image" << endl;
 146                 finishedLoading(false);
 147                 return;
 148         }
 149         xformed_pixmap_ = pixmap_;
 150         finishedLoading(true);
 151 }
 152
 153
 154 bool QLImage::setPixmap_impl(Params const & params)
 155 {
 156         if (pixmap_.isNull() || params.display == NoDisplay)
 157                 return false;
 158
 159         // FIXME: it's a fake kind of grayscale !
 160
 161         switch (params.display) {
 162                 case GrayscaleDisplay:
 163                 case MonochromeDisplay: {
 164                         QImage i(xformed_pixmap_.convertToImage());
 165                         xformed_pixmap_.convertFromImage(i, QPixmap::Mono);
 166                         break;
 167                 }
 168
 169                 default:
 170                         break;
 171         }
 172 // FIXME
 173 #if 0
 174         unsigned int fill = packedcolor(LColor::graphicsbg);
 175         if (fill != image_->fill_color) {
 176                 // the background color has changed.
 177                 // Note that in grayscale/monochrome images the background is
 178                 // grayed also, so this call will have no visible effect. Sorry!
 179                 flimage_replace_pixel(image_, image_->fill_color, fill);
 180                 image_->fill_color = fill;
 181         }
 182 #endif
 183
 184         return true;
 185 }
 186
 187
 188 void QLImage::clip_impl(Params const & params)
 189 {
 190         if (xformed_pixmap_.isNull())
 191                 return;
 192
 193         if (params.bb.empty())
 194                 // No clipping is necessary.
 195                 return;
 196
 197         int const new_width  = params.bb.xr - params.bb.xl;
 198         int const new_height = params.bb.yt - params.bb.yb;
 199
 200         // No need to check if the width, height are > 0 because the
 201         // Bounding Box would be empty() in this case.
 202         if (new_width > pixmap_.width() || new_height > pixmap_.height()) {
 203                 // Bounds are invalid.
 204                 return;
 205         }
 206
 207         if (new_width == pixmap_.width() && new_height == pixmap_.height())
 208                 return;
 209
 210         int const xoffset_l = params.bb.xl;
 211         int const yoffset_t = (pixmap_.height() > params.bb.yt ?
 212                                 pixmap_.height() - params.bb.yt : 0);
 213
 214         xformed_pixmap_.resize(new_width, new_height);
 215         QPainter p;
 216         p.begin(&xformed_pixmap_);
 217         p.drawPixmap(0, 0, pixmap_, xoffset_l, yoffset_t, new_width, new_height);
 218         p.end();
 219 }
 220
 221
 222 void QLImage::rotate_impl(Params const & params)
 223 {
 224         if (xformed_pixmap_.isNull())
 225                 return;
 226
 227         if (!params.angle)
 228                 return;
 229
 230         // The angle passed to flimage_rotate is the angle in one-tenth of a
 231         // degree units.
 232
 233         QWMatrix m;
 234         m.rotate(-params.angle);
 235         xformed_pixmap_ = xformed_pixmap_.xForm(m);
 236 }
 237
 238
 239 void QLImage::scale_impl(Params const & params)
 240 {
 241         if (xformed_pixmap_.isNull())
 242                 return;
 243
 244         unsigned int width;
 245         unsigned int height;
 246         boost::tie(width, height) = getScaledDimensions(params);
 247
 248         if (width == getWidth() && height == getHeight())
 249                 return;
 250
 251         QWMatrix m;
 252         m.scale(double(width) / getWidth(), double(height) / getHeight());
 253         xformed_pixmap_ = xformed_pixmap_.xForm(m);
 254 }
 255
 256 } // namespace graphics
 257 } // lyx