src/frontends/qt2/QLImage.C

   1 /*
   2  * \file QLImage.C
   3  * Copyright 2002 the LyX Team
   4  * Read the file COPYING
   5  *
   6  * \author Angus Leeming, a.leeming@ic.ac.uk
   7  * \author John Levon <moz@compsoc.man.ac.uk>
   8  */
   9
  10 #include <config.h>
  11
  12 #ifdef __GNUG__
  13 #pragma implementation
  14 #endif
  15
  16 #include "QLImage.h"
  17 #include "graphics/GraphicsParams.h"
  18 #include "converter.h"
  19 #include "debug.h"
  20 #include "support/LAssert.h"
  21 #include "support/lyxfunctional.h"  // compare_memfun
  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
  31 namespace grfx {
  32
  33 /// Access to this class is through this static method.
  34 Image::ImagePtr QLImage::newImage()
  35 {
  36         ImagePtr ptr;
  37         ptr.reset(new QLImage);
  38         return ptr;
  39 }
  40
  41
  42 /// Return the list of loadable formats.
  43 Image::FormatList QLImage::loadableFormats()
  44 {
  45         static FormatList fmts;
  46
  47         if (!fmts.empty())
  48                 return fmts;
  49
  50         // The formats recognised by LyX
  51         Formats::const_iterator begin = formats.begin();
  52         Formats::const_iterator end   = formats.end();
  53
  54         lyxerr[Debug::GRAPHICS]
  55                 << "\nThe image loader can load the following directly:\n";
  56
  57         QStrList qt_formats = QImageIO::inputFormats();
  58
  59         QStrListIterator it(qt_formats);
  60
  61         for (; it.current(); ++it) {
  62                 lyxerr[Debug::GRAPHICS] << it.current() << endl;
  63
  64                 string ext = lowercase(it.current());
  65
  66                 // special case
  67                 if (ext == "jpeg")
  68                         ext = "jpg";
  69
  70                 Formats::const_iterator fit =
  71                         find_if(begin, end, lyx::compare_memfun(&Format::extension, ext));
  72                 if (fit != end)
  73                         fmts.push_back(fit->name());
  74         }
  75
  76         lyxerr[Debug::GRAPHICS]
  77                 << "\nOf these, LyX recognises the following formats:\n";
  78
  79         FormatList::const_iterator fbegin = fmts.begin();
  80         FormatList::const_iterator fend   = fmts.end();
  81         for (FormatList::const_iterator fit = fbegin; fit != fend; ++fit) {
  82                 if (fit != fbegin)
  83                         lyxerr[Debug::GRAPHICS] << ", ";
  84                 lyxerr[Debug::GRAPHICS] << *fit;
  85         }
  86         lyxerr[Debug::GRAPHICS] << '\n' << std::endl;
  87
  88         return fmts;
  89 }
  90
  91
  92 QLImage::QLImage()
  93         : Image()
  94 {
  95 }
  96
  97
  98 QLImage::QLImage(QLImage const & other)
  99         : Image(other), pixmap_(other.pixmap_)
 100 {
 101 }
 102
 103
 104 QLImage::~QLImage()
 105 {
 106 }
 107
 108
 109 Image * QLImage::clone() const
 110 {
 111         return new QLImage(*this);
 112 }
 113
 114
 115 unsigned int QLImage::getWidth() const
 116 {
 117         return pixmap_.width();
 118 }
 119
 120
 121 unsigned int QLImage::getHeight() const
 122 {
 123         return pixmap_.height();
 124 }
 125
 126
 127 void QLImage::load(string const & filename)
 128 {
 129         if (!pixmap_.isNull()) {
 130                 lyxerr[Debug::GRAPHICS]
 131                         << "Image is loaded already!" << std::endl;
 132                 finishedLoading(false);
 133                 return;
 134         }
 135
 136         if (!pixmap_.load(filename.c_str())) {
 137                 lyxerr[Debug::GRAPHICS]
 138                         << "Unable to open image" << std::endl;
 139                 finishedLoading(false);
 140                 return;
 141         }
 142         finishedLoading(true);
 143 }
 144
 145
 146 bool QLImage::setPixmap(Params const & params)
 147 {
 148         if (pixmap_.isNull() || params.display == NoDisplay)
 149                 return false;
 150
 151 // FIXME
 152 #if 0
 153         int color_key;
 154         switch (params.display) {
 155         case MonochromeDisplay:
 156                 color_key = FL_IMAGE_MONO;
 157                 break;
 158         case GrayscaleDisplay:
 159                 color_key = FL_IMAGE_GRAY;
 160                 break;
 161         case ColorDisplay:
 162         default: // NoDisplay cannot happen!
 163                 color_key = FL_IMAGE_RGB;
 164                 break;
 165         }
 166
 167         if (color_key != FL_IMAGE_RGB) {
 168                 flimage_convert(image_, color_key, 0);
 169         }
 170
 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         xformed_pixmap_ = pixmap_;
 182         return true;
 183 }
 184
 185
 186 void QLImage::clip(Params const & params)
 187 {
 188         if (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 = std::max(0, params.bb.xl);
 209         int const yoffset_t = std::max(0, pixmap_.height() - params.bb.yt);
 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 / 10.0);
 232         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         xformed_pixmap_.resize(width, height);
 249 }
 250
 251 } // namespace grfx