* Revert "Revert "Reland "Run Flutter on iOS and Android with color correct Skia" (#3818)" (#3823)"
This reverts commit db8d8a9979901d05b011368226ad5bf61b1da13f.
* Fix test code to match internal API change
* Revert "Revert "Run Flutter on iOS and Android with color correct Skia (#3743)" (#3775)"
This reverts commit cfe70e07d386d6052267fe3772bbd641c8413a54.
* Enable sRGB on IO thread, too
* Add 4444 as a fallback rendering mode
* Use bare ptr to SkColorSpace (not sk_sp) in PrerollContext
* Run Flutter on iOS and Android with color correct Skia (#3716)
***Turns on color correct rendering for Android and iOS
***Communicates dst color space to raster cache
***Turns on color space aware image decoding
Test:
***color_testing_demo on Pixel XL
***flutter_gallery on iPad Mini and iPad Pro (haven't figured out how to run manual_tests on iOS)
TODO:
I needed to split up this CL somewhere. These are follow-up tasks.
***Make desktop backends color correct
***Make debugging tools (ex: encoding frames to png) preserve color space
***Investigate using UIKit API to allow iOS to fine tune color space of rendered content
* Fix pixel rounding error in the picture layer by first ensuring that
the texture for the image is at least as big as the next integer size
along each dimension and using kStrict_SrcRectConstraint while
drawing the same image. We already select the source subset by
looking at the cull rect of the picture.
* Decompose the transformation matrix into a series of operations that
generated the same to calculate the scale at which to rasterize the
picture. This make the rasterization scale resilient to
transformations that introduce a perspective component to the
resultant matrix.
* The scale in the decomposed matrix is now part of the key in the
cache.
* Raster cache images that could never be rasterized were still taking
part in the cache. Now, those entries are rejected early on. This
leads to the sweep after the frame iterating over fewer items.
* Added a unit test target.
