[Marble-devel] marble enlarge the tile image, how can i show in original size?

[jun yang]

i change the openstreetmap.dgml to get tile from my tile server,
unfortunately marble doesn't show the tile in the orginal size.
marble always enlarge the image,from 256*256 to atleast 390*390.so the
display effect is bad cause there is font on it.

test info:
take tile image:15/26702/14219.png
i zoom in an out,and found that marble display the same tile image for
three times.
first time it came out(level 14 to 15),the size is 390*390 or so,not
the original size 256*256.
zoom in then marble just enlarge the image, and zoom in again the
image enlarge again.
and another zoom in will enter level 16.


now the problem is how can i get the proper display in marble?
currently marble cann't display the original image atleast one time.
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