Lukas Tönne
45fc80153a
inputs. http://wiki.blender.org/uploads/4/4c/Compo_image_interpolation_borders.png Problem is that all image buffer reader nodes (RenderLayer, Image, MovieClip) were clipping pixel coordinates to 0..N range (N being width or height respectively). Bilinear interpolation works ok then on the upper-right borders (x, N) and (N, y), since the last (N-1) pixel fades out to N (background). But the lower-left (x, 0) and (0, y) borders are not correctly interpolated because the nodes cut off the negative pixels before the interpolation function can calculate their value. To fix this, the interpolation functions are now entirely responsible for handling "out of range" cases, i.e. setting (0,0,0,0) results for invalid pixels, while also handling interpolation for borders. Callers should not do pixel range checks themselves, which also makes the code simpler. Should not have any real performance penalty, the interpolation functions do this check anyway, so is probably even slightly faster.
