src/frontends/qt4/GuiImage.cpp

   1 /**
   2  * \file GuiImage.cpp
   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 "GuiImage.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/FileName.h"
  23 #include "support/lstrings.h"       // ascii_lowercase
  24
  25 #include <QPainter>
  26 #include <QImage>
  27 #include <QImageReader>
  28
  29 #include <boost/bind.hpp>
  30 #include <boost/tuple/tuple.hpp>
  31
  32 using lyx::support::ascii_lowercase;
  33
  34 using boost::bind;
  35
  36 using std::endl;
  37 using std::equal_to;
  38 using std::find_if;
  39 using std::string;
  40
  41 namespace lyx {
  42 namespace graphics {
  43
  44 /// Access to this class is through this static method.
  45 Image::ImagePtr GuiImage::newImage()
  46 {
  47         ImagePtr ptr;
  48         ptr.reset(new GuiImage);
  49         return ptr;
  50 }
  51
  52
  53 /// Return the list of loadable formats.
  54 Image::FormatList GuiImage::loadableFormats()
  55 {
  56         static FormatList fmts;
  57
  58         if (!fmts.empty())
  59                 return fmts;
  60
  61         // The formats recognised by LyX
  62         Formats::const_iterator begin = formats.begin();
  63         Formats::const_iterator end   = formats.end();
  64
  65
  66 //      LYXERR(Debug::GRAPHICS,
  67 //              "D:/msys/home/yns/src/lyx-devel/lib/images/banner.png mis of format: "
  68 //              << fromqstr(Pic.pictureFormat("D:/msys/home/yns/src/lyx-devel/lib/images/banner.png")))
  69 //      if (Pic.pictureFormat("D:/msys/home/yns/src/lyx-devel/lib/images/banner.png"))
  70 //              LYXERR(Debug::GRAPHICS, "pictureFormat not returned NULL\n"
  71 //                      << "Supported formats are: " << Pic.inputFormats());
  72
  73         QList<QByteArray> qt_formats = QImageReader::supportedImageFormats();
  74
  75         LYXERR(Debug::GRAPHICS,
  76                 "\nThe image loader can load the following directly:\n");
  77
  78         if (qt_formats.empty())
  79                 LYXERR(Debug::GRAPHICS, "\nQt4 Problem: No Format available!");
  80
  81         for (QList<QByteArray>::const_iterator it = qt_formats.begin(); it != qt_formats.end(); ++it) {
  82
  83                 LYXERR(Debug::GRAPHICS, (const char *) *it << ", ");
  84
  85                 string ext = ascii_lowercase((const char *) *it);
  86
  87                 // special case
  88                 if (ext == "jpeg")
  89                         ext = "jpg";
  90
  91                 Formats::const_iterator fit =
  92                         find_if(begin, end,
  93                                 bind(equal_to<string>(),
  94                                      bind(&Format::extension, _1),
  95                                      ext));
  96                 if (fit != end)
  97                         fmts.push_back(fit->name());
  98         }
  99
 100         if (lyxerr.debugging()) {
 101                 LYXERR(Debug::GRAPHICS, "\nOf these, LyX recognises the following formats:");
 102
 103                 FormatList::const_iterator fbegin = fmts.begin();
 104                 FormatList::const_iterator fend   = fmts.end();
 105                 for (FormatList::const_iterator fit = fbegin; fit != fend; ++fit) {
 106                         if (fit != fbegin)
 107                                 LYXERR(Debug::GRAPHICS, ", ");
 108                         LYXERR(Debug::GRAPHICS, *fit);
 109                 }
 110                 LYXERR(Debug::GRAPHICS, '\n');
 111         }
 112
 113         return fmts;
 114 }
 115
 116
 117 GuiImage::GuiImage(GuiImage const & other)
 118         : Image(other), original_(other.original_),
 119           transformed_(other.transformed_),
 120           transformed_pixmap_(other.transformed_pixmap_)
 121 {}
 122
 123
 124 Image * GuiImage::clone() const
 125 {
 126         return new GuiImage(*this);
 127 }
 128
 129
 130 unsigned int GuiImage::getWidth() const
 131 {
 132         return transformed_.width();
 133 }
 134
 135
 136 unsigned int GuiImage::getHeight() const
 137 {
 138         return transformed_.height();
 139 }
 140
 141
 142 void GuiImage::load(support::FileName const & filename)
 143 {
 144         if (!original_.isNull()) {
 145                 LYXERR(Debug::GRAPHICS, "Image is loaded already!");
 146                 finishedLoading(false);
 147                 return;
 148         }
 149
 150         if (!original_.load(toqstr(filename.absFilename()))) {
 151                 LYXERR(Debug::GRAPHICS, "Unable to open image");
 152                 finishedLoading(false);
 153                 return;
 154         }
 155         transformed_ = original_;
 156         finishedLoading(true);
 157 }
 158
 159
 160 // This code is taken from KImageEffect::toGray
 161 static QImage & toGray(QImage & img)
 162 {
 163         if (img.width() == 0 || img.height() == 0)
 164                 return img;
 165
 166         int const pixels = img.depth() > 8 ?
 167                 img.width() * img.height() : img.numColors();
 168
 169         unsigned int *data = img.depth() > 8 ?
 170                 reinterpret_cast<unsigned int *>(img.bits()) :
 171                 reinterpret_cast<unsigned int *>(&img.colorTable()[0]);
 172
 173         for(int i = 0; i < pixels; ++i){
 174                 int const val = qGray(data[i]);
 175                 data[i] = qRgba(val, val, val, qAlpha(data[i]));
 176         }
 177         return img;
 178 }
 179
 180
 181 bool GuiImage::setPixmap(Params const & params)
 182 {
 183         if (original_.isNull() || params.display == NoDisplay)
 184                 return false;
 185
 186         switch (params.display) {
 187         case GrayscaleDisplay: {
 188                 toGray(transformed_);
 189                 break;
 190         }
 191
 192         case MonochromeDisplay: {
 193                 transformed_.convertToFormat(transformed_.format(), Qt::MonoOnly);
 194                 break;
 195         }
 196
 197         default:
 198                 break;
 199         }
 200
 201         transformed_pixmap_ = QPixmap::fromImage(transformed_);
 202         return true;
 203 }
 204
 205
 206 void GuiImage::clip(Params const & params)
 207 {
 208         if (transformed_.isNull())
 209                 return;
 210
 211         if (params.bb.empty())
 212                 // No clipping is necessary.
 213                 return;
 214
 215         int const new_width  = params.bb.xr - params.bb.xl;
 216         int const new_height = params.bb.yt - params.bb.yb;
 217
 218         // No need to check if the width, height are > 0 because the
 219         // Bounding Box would be empty() in this case.
 220         if (new_width > original_.width() || new_height > original_.height()) {
 221                 // Bounds are invalid.
 222                 return;
 223         }
 224
 225         if (new_width == original_.width() && new_height == original_.height())
 226                 return;
 227
 228         int const xoffset_l = params.bb.xl;
 229         int const yoffset_t = (original_.height() > int(params.bb.yt) ?
 230                                original_.height() - params.bb.yt : 0);
 231
 232         transformed_ = original_.copy(xoffset_l, yoffset_t,
 233                                       new_width, new_height);
 234 }
 235
 236
 237 void GuiImage::rotate(Params const & params)
 238 {
 239         if (transformed_.isNull())
 240                 return;
 241
 242         if (!params.angle)
 243                 return;
 244
 245         QMatrix m;
 246         m.rotate(-params.angle);
 247
 248         transformed_ = transformed_.transformed(m);
 249 }
 250
 251
 252 void GuiImage::scale(Params const & params)
 253 {
 254         if (transformed_.isNull())
 255                 return;
 256
 257         unsigned int width;
 258         unsigned int height;
 259         boost::tie(width, height) = getScaledDimensions(params);
 260
 261         if (width == getWidth() && height == getHeight())
 262                 return;
 263
 264         QMatrix m;
 265         m.scale(double(width) / getWidth(), double(height) / getHeight());
 266         transformed_ = transformed_.transformed(m);
 267 }
 268
 269 } // namespace graphics
 270 } // lyx