1 files changed, 174 insertions, 0 deletions

diff --git a/src/plugins/thumbnailqt_extractor.cc b/src/plugins/thumbnailqt_extractor.cc
new file mode 100644
index 0000000..5f4ad9c
--- /dev/null
+++ b/src/plugins/thumbnailqt_extractor.cc
@@ -0,0 +1,174 @@
+/*
+     This file is part of libextractor.
+     (C) 2006, 2009 Vidyut Samanta and Christian Grothoff
+
+     libextractor is free software; you can redistribute it and/or modify
+     it under the terms of the GNU General Public License as published
+     by the Free Software Foundation; either version 2, or (at your
+     option) any later version.
+
+     libextractor is distributed in the hope that it will be useful, but
+     WITHOUT ANY WARRANTY; without even the implied warranty of
+     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+     General Public License for more details.
+
+     You should have received a copy of the GNU General Public License
+     along with libextractor; see the file COPYING.  If not, write to the
+     Free Software Foundation, Inc., 59 Temple Place - Suite 330,
+     Boston, MA 02111-1307, USA.
+ */
+
+/**
+ * @file thumbnailqt_extractor.cc
+ * @author Nils Durner
+ * @brief this extractor produces a binary (!) encoded
+ * thumbnail of images (using Qt).
+ */
+
+#include "platform.h"
+#include "extractor.h"
+#include <Qt/qpixmap.h>
+#include <Qt/qbytearray.h>
+#include <Qt/qbuffer.h>
+#include <Qt/qapplication.h>
+#include <pthread.h>
+
+#ifdef HAVE_QT_SVG
+  #include <Qt/qsvgrenderer.h>
+  #include <Qt/qpainter.h>
+#endif
+
+#define THUMBSIZE 128
+
+extern "C"
+{
+
+int 
+EXTRACTOR_thumbnailqt_extract (const char *data,
+                               size_t size,
+                               EXTRACTOR_MetaDataProcessor proc,
+                               void *proc_cls,
+                               const char *options)
+{
+  QImage *img;
+  QByteArray bytes;
+  QBuffer buffer;
+  unsigned long width;
+  unsigned long height;
+  char format[64];
+  QImage::Format colors;
+
+  /* Determine image format to use */
+  if (options == NULL)
+    colors = QImage::Format_Indexed8;
+  else
+    switch (atoi(options))
+      {
+      case 1:
+        colors = QImage::Format_Mono;
+        break;
+      case 8:
+        colors = QImage::Format_Indexed8;
+        break;
+      case 16:
+      case 24:
+        colors = QImage::Format_RGB32;
+        break;
+      default:
+        colors = QImage::Format_ARGB32;
+        break;
+      }
+  QByteArray din (data, (int) size);
+
+#ifdef HAVE_QT_SVG
+  /* Render SVG image */
+  QSvgRenderer svg;
+  QSize qsize;
+  if (svg.load(din))
+    {
+      qsize = svg.defaultSize();
+      img = new QImage(qsize, QImage::Format_ARGB32);
+      QPainter painter(img);
+      painter.setViewport(0, 0, qsize.width(), qsize.height());
+      painter.eraseRect(0, 0, qsize.width(), qsize.height());      
+      svg.render(&painter);
+    }
+  else
+#endif
+    {
+      /* Load image */
+      img = new QImage();
+      img->loadFromData(din);
+    }
+
+  height = img->height();
+  width = img->width();
+  snprintf(format,
+           sizeof(format),
+           "%ux%u",
+           (unsigned int) width,
+           (unsigned int) height);
+  if (0 != proc (proc_cls,
+                 "thumbnailqt",
+                 EXTRACTOR_METATYPE_IMAGE_DIMENSIONS,
+                 EXTRACTOR_METAFORMAT_UTF8,
+                 "text/plain",
+                 format,
+                 strlen(format)+1))
+    {
+      delete img;
+      return 1;
+    }
+  if (height == 0)
+    height = 1;
+  if (width == 0)
+    width = 1;
+
+  /* Change color depth */
+  QImage thumb = img->convertToFormat(colors);
+  delete img;
+
+  /* Resize image
+   *
+   * Qt's scaled() produces poor quality if the image is resized to less than
+   * half the size. Therefore, we resize the image in multiple steps.
+   * http://lists.trolltech.com/qt-interest/2006-04/msg00376.html */
+  while ( (width > THUMBSIZE) || (height > THUMBSIZE) )
+    {
+      width /= 2;
+      if (width < THUMBSIZE)
+        width = THUMBSIZE;      
+      height /= 2;
+      if (height < THUMBSIZE)
+        height = THUMBSIZE;      
+      thumb = thumb.scaled(width, 
+                           height, 
+                           Qt::KeepAspectRatio,
+                           Qt::SmoothTransformation);
+    }
+  buffer.setBuffer(&bytes);
+  buffer.open(QIODevice::WriteOnly);
+  thumb.save(&buffer, "PNG");
+  return proc (proc_cls,
+               "thumbnailqt",
+               EXTRACTOR_METATYPE_THUMBNAIL,
+               EXTRACTOR_METAFORMAT_BINARY,
+               "image/png",
+               bytes.data(),
+               bytes.length());
+}
+
+
+int 
+EXTRACTOR_thumbnail_extract (const unsigned char *data,
+                             size_t size,
+                             EXTRACTOR_MetaDataProcessor proc,
+                             void *proc_cls,
+                             const char *options)
+{
+  return EXTRACTOR_thumbnail_extract (data, size, proc, proc_cls, options);
+}
+
+} // extern "C"
+
+/* end of thumbnailqt_extractor.cc */