Ignoring for the moment principled reasons to do this,
this has the following nice properties:
1) in the absence of a color space transform,
all sources are transformed to opaque by dropping
their alpha channel (not part of the steps)
2) premul sources are not unpremultiplied
unless we need to transform color spaces
3) unpremul sources are never premultiplied
This seems like the best generalization of 1) to cases
that require a color space transformation.
The alternative that we have at head treats opaque as
unpremul, so transforming from premul to opaque preserves
the abstract color but not the color composed on black.
Change-Id: Ic7d7ee24012da3d53378c20f5a4e54fa32405613
Reviewed-on: https://skia-review.googlesource.com/148388
Commit-Queue: Mike Klein <mtklein@google.com>
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Reviewed-by: Brian Osman <brianosman@google.com>
All the existing calls are ported over, and new tests cover
unpremul output. (Opaque output is an impossible request.)
Change-Id: I744d640763cf74c368d3b3aba4a262c8fd9f7a01
Reviewed-on: https://skia-review.googlesource.com/147100
Commit-Queue: Mike Klein <mtklein@google.com>
Reviewed-by: Brian Osman <brianosman@google.com>
Auto-Submit: Mike Klein <mtklein@google.com>
Added some helper functions and put the booleans in a nested struct
(this is motivated by upcoming changes). Added a unit test of steps
against skcms, with round-tripping in both combinations.
Change-Id: Iea3d60cd52edb5259b5576b1422ed6f856cde815
Reviewed-on: https://skia-review.googlesource.com/134660
Reviewed-by: Mike Klein <mtklein@google.com>
Reviewed-by: Brian Osman <brianosman@google.com>
Commit-Queue: Brian Osman <brianosman@google.com>
feels so good.
Change-Id: I24d223957945ee81f34e5815a8e9afe32ef5004e
Reviewed-on: https://skia-review.googlesource.com/131110
Commit-Queue: Mike Klein <mtklein@chromium.org>
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Auto-Submit: Mike Klein <mtklein@chromium.org>
Reviewed-by: Brian Salomon <bsalomon@google.com>
Here's our drawing pipeline if we always blend as encoded.
I think it's very intuitive.
Change-Id: I0e531c5da1f6279d0da1f19b84d6317d99942da3
Reviewed-on: https://skia-review.googlesource.com/130131
Reviewed-by: Brian Osman <brianosman@google.com>
Commit-Queue: Mike Klein <mtklein@chromium.org>
Change-Id: I26ed83bb613a83a0fd73f2f8b868b775be1ce968
Reviewed-on: https://skia-review.googlesource.com/130121
Commit-Queue: Mike Klein <mtklein@chromium.org>
Auto-Submit: Mike Klein <mtklein@chromium.org>
Reviewed-by: Brian Osman <brianosman@google.com>
Change-Id: I72e1084e6a14b3c1fa3f0a5c2100f13c6bcb24c7
Reviewed-on: https://skia-review.googlesource.com/130062
Commit-Queue: Mike Klein <mtklein@chromium.org>
Auto-Submit: Mike Klein <mtklein@chromium.org>
Reviewed-by: Brian Osman <brianosman@google.com>
- opaque and unpremul are never the same...
there's no reason to ever premul opaque sources.
- under optimization, they won't always be a deterministic
tweak the the premul steps (though right now they still are).
Change-Id: I5669b3dba83774326c07d5a8f16b1d2ce2b22aae
Reviewed-on: https://skia-review.googlesource.com/130061
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Commit-Queue: Brian Osman <brianosman@google.com>
Auto-Submit: Mike Klein <mtklein@chromium.org>
Change-Id: I3bb3ec19ee856ce4070a58a57b3bb8e8a170a5b9
Reviewed-on: https://skia-review.googlesource.com/130024
Commit-Queue: Mike Klein <mtklein@chromium.org>
Auto-Submit: Mike Klein <mtklein@chromium.org>
Reviewed-by: Brian Osman <brianosman@google.com>
Lots TODO.
Change-Id: I95edb764b85a5140d432adb506c3b537869e6df4
Reviewed-on: https://skia-review.googlesource.com/129933
Commit-Queue: Mike Klein <mtklein@chromium.org>
Reviewed-by: Brian Osman <brianosman@google.com>
Auto-Submit: Mike Klein <mtklein@chromium.org>
