Canon D30 has a 12.0MP 1/2.3" (6.17 x 4.55 mm ) sized BSI-CMOS sensor and features DIGIC 4 processor. On the other hand, Fujifilm XP90 has a 16.0MP 1/2.3" (6.17 x 4.55 mm ) sized BSI-CMOS sensor .
Below you can see the D30 and XP90 sensor size comparison.
Canon D30 and Fujifilm XP90 have sensor sizes so they will provide same level of control over the depth of field when used with same focal length and aperture. On the other hand, since Canon D30 has 32% larger pixel area compared to Fujifilm XP90, it has potential to collect more light on pixel level hence have less noise in low light / High ISO images.