Add float16 support 2d context #41215
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Allow users to create 2d context with pixelFormat float16, i.e., users
can now create context like: ctx = canvas.getContext('2d',
{pixelFormat: 'float16'}).
Note that the default colortype for getImageData is uint8, so calls like
`ctx.getImageData(x, y, w, h)` without `colortype` returns pixels in
format uint8 with context of type float16.
proposal:
w3c/ColorWeb-CG#105
Bug: 1468666
Change-Id: I0309c6d8c573edc84a6a6643ea8ae9563986a242
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Allow users to create 2d context with pixelFormat float16, i.e., users
can now create context like: ctx = canvas.getContext('2d',
{pixelFormat: 'float16'}).
Note that the default colortype for getImageData is uint8, so calls like
ctx.getImageData(x, y, w, h)withoutcolortypereturns pixels informat uint8 with context of type float16.
proposal:
w3c/ColorWeb-CG#105
Bug: 1468666
Change-Id: I0309c6d8c573edc84a6a6643ea8ae9563986a242
Reviewed-on: https://chromium-review.googlesource.com/4727326
WPT-Export-Revision: 8d97c9e11e12579660a8b952ce378e8a6499a9ae