| Value | Meaning |
|---|---|
| sourceOver | (default) Fastest mode, blend source over the background. Note that this goes considerable faster than other blend modes. This is because this mode skips holes instead of compositing it, And traverse pixels only once. |
| add | Add source color (weighted by alpha) to background. |
| lighteradd | ditto |
| subtract | Subtract source color (weighted by alpha) from background. |
| lighten | Choose maximum of color values. Do not mistake for "lighter" which is an add, not a max. |
| darken | Choose minimum of color values. |
How to composite against background (background is always considered opaque in dplug:canvas).