[gdal-dev] Can I get transformed coordinate value in gdalwarp?

[OHTSUKA Ko-hei]

Hello,

I'll try to change many raster images into geotiffs using gdal (gdalwarp).
And, want to know where each image's non -gcp pixel points  will move to.

For example,

If image's point (300,400) will move to GeoTiff's (135e,35n),
by using gcps (200,300 => 130e,40n), (200,500 => 130e, 30n), and (400,
300 => 140e, 40n),
I want to know this change (300,400 => 135e,35n).
And also, (250, 400) moves where? (350, 200) is? and so on.

Is there any function to get this value?
Or, I also understand program a little, it is OK if it needs some coding.

Thanks,
Ko-hei