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