Quality slightly drops with each operation

[kirillt]

Crop and rotate operations cause quality to slightly drop and this effect accumulates.
Both of these operations must just accumulate some matrix transformation without actual render (except preview).

Rendering must happen only during saving into a file. During this final rendering, all operations must be applied at once if possible. It might be difficult to "sandwich" operations without loss of quality, e.g. crop, rotate, crop. But if possible to represent such a heterogeneous sequence of operations as a single matrix transformation, that would be perfect.

Sequences like crop, crop, crop or rotate, rotate, rotate always can be reduced to a single operation.

Example 1 (original image is 100x100):

crop(10,10,20,20)
crop(5,5,10,10)

is the same as

crop(15,15,20,20)

Example 2:

rotate(90 degrees)
rotate(-10 degrees)
rotate(40 degrees)
rotate(-20 degrees)

is the same as

rotate(100 degrees)

[kirillt]

Example with rotation operation:

blurr.mp4