libextractor

commit 0aeefc3c4250409c7428eeae444f6a753c470e40
parent 3a88a4183f03ee06cde7da8f2b95c5fdaf5c99c0
Author: Nils Durner <durner@gnunet.org>
Date:   Sun, 25 Jun 2006 01:32:01 +0000

improve thumbnail quality

Diffstat:
M
src/plugins/thumbnailextractorqt.cc
 | 
30
+++++++++++++++++++-----------

1 file changed, 19 insertions(+), 11 deletions(-)
diff --git a/src/plugins/thumbnailextractorqt.cc b/src/plugins/thumbnailextractorqt.cc
@@ -192,20 +192,28 @@ struct EXTRACTOR_Keywords * libextractor_thumbnailqt_extract(const char * filena
     height = 1;
   if (width == 0)
     width = 1;
+ 
+  /* Resize image */
+  QImage thumb = img->convertToFormat(colors);
+  delete img;
 
-  if (height > THUMBSIZE) {
-    width = width * THUMBSIZE / height;
-    height = THUMBSIZE;
-  }
-  if (width > THUMBSIZE) {
-    height = height * THUMBSIZE / width;
-    width = THUMBSIZE;
+  while(true)
+  {
+    width /= 2;
+    if (width < THUMBSIZE)
+      width = THUMBSIZE;
+
+    height /= 2;
+    if (height < THUMBSIZE)
+      height = THUMBSIZE;
+    
+    thumb = thumb.scaled(width, height, Qt::KeepAspectRatio,
+      Qt::SmoothTransformation);
+    
+    if (width == THUMBSIZE && height == THUMBSIZE)
+      break;
   }
   
-  QImage thumb = img->scaled(width, height, Qt::KeepAspectRatio,
-    Qt::SmoothTransformation).convertToFormat(colors);
-  delete img;
-  
   buffer.setBuffer(&bytes);
   buffer.open(QIODevice::WriteOnly);
   thumb.save(&buffer, "PNG");