Scale a rectangle of pixels in src with src_stride to dest with dest_stride using the
horizontal scaler hscaler and the vertical scaler vscale.
One or both of this and vscale can be NULL to only perform scaling in one dimension or do
a copy without scaling.
x and y are the coordinates in the destination image to process.
| this |
a horizontal Scaler |
| vscale |
a vertical Scaler |
| format |
a Format for |
| src |
source pixels |
| src_stride |
source pixels stride |
| dest |
destination pixels |
| dest_stride |
destination pixels stride |
| x |
the horizontal destination offset |
| y |
the vertical destination offset |
| width |
the number of output pixels to scale |
| height |
the number of output lines to scale |