ColorMatrix value range for 5th column is incorrect on Skiko backed platforms

[chrisbanes]

Describe the bug

On Android, the matrix is passed to Android's own ColorMatrix class. That treats the final column in the range of -255..255. On Skiko backed platforms though, it is passed directly to Skia, and that treats the final column in the range of -1f..1f.

The docs on androidx.compose.ui.graphics.ColorMatrix in CMP list out the range -255..255, so it sounds like there's need to be a mapping before the matrix is set to Skiko?

Example:

val cm = ColorMatrix().apply {
    this[0, 4] = 64f
    this[1, 4] = 64f
    this[2, 4] = 64f
}

Image(
    ...,
    colorFilter = ColorFilter.colorMatrix(colorMatrix),
)

On Android, the image will look brighter. On iOS, the image will be completely white.

Affected platforms
Select one of the platforms below:

• Skiko backed platforms

[elijah-semyonov]

Will be fixed in this PR.