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