The current scaling quality of images by Xrender is poor.
It could be improved considerably by using the bilinear filter Xrender supports. Bilinear resizing is the default in FLTK's image drawing routines when Xrender is not used, so using it also with Xrender would be appropriate. It's only a one-liner:

xrender_bilinear_patch.txt

Here's a test program to compare the difference to the current Xrender scaling:
xrender_bilinear_test.tar.gz
(Assumes the patch is active and it is executed from the test folder)

Example output:

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