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