Add an extension to QPixmapCache to get rid of strings.

This commit add a new API to add/find/remove pixmaps into QPixmapCache.
This new extension is based on a key that the cache give you during
the insertion. This key is internally a int which makes all operations
in the cache much more faster that the string approach.
Auto-tests has been extended as well and a benchmark has been added to
compare both approach. I also depecrate the find method for the
string API to have a method pointer based and not reference based like
the Qt policy says.

Reviewed-by: bnilsen
Reviewed-by: andreas
Followed-deeply-by: trond

1 files changed, 1 insertions, 1 deletions

diff --git a/doc/src/snippets/code/src_gui_image_qpixmapcache.cpp b/doc/src/snippets/code/src_gui_image_qpixmapcache.cpp
index c4b6353..2a04f64 100644
--- a/doc/src/snippets/code/src_gui_image_qpixmapcache.cpp
+++ b/doc/src/snippets/code/src_gui_image_qpixmapcache.cpp
@@ -13,7 +13,7 @@ painter->drawPixmap(0, 0, p);
 
 //! [1]
 QPixmap pm;
-if (!QPixmapCache::find("my_big_image", pm)) {
+if (!QPixmapCache::find("my_big_image", &pm)) {
     pm.load("bigimage.png");
     QPixmapCache::insert("my_big_image", pm);
 }