Implement brightness and opacity using blend modes #44457
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This pull request was exported from Phabricator. Differential Revision: D56447175 |
Summary: This works similar to how `transform` is parsed in that it sets tags on the View to actually update the prop when all the prop setters are done being called since the parsing of the array is not very trivial. Besides that it is pretty simple and just calls into `FilterHelper` and uses `setRenderEffect`: https://developer.android.com/reference/android/view/View#setRenderEffect(android.graphics.RenderEffect). That API is only exposed in version 31 of the SDK so it is gated accordingly. Reviewed By: NickGerleman Differential Revision: D54640600
Summary: tsia Changelog: [Internal] Reviewed By: NickGerleman Differential Revision: D56847475
Summary: Title says it all. Right now this ignores drop-shadow as that will be implemented later. Some of this code will need to be adjusted as it is the one filter that takes multiple amounts. But I feel that can be amended later when we get there - after all the `amount` parsing code is just casting to a float at the moment, so we are not locking ourselves into anything. Changelog: [Internal] Reviewed By: NickGerleman Differential Revision: D54640629
…xt and containing block (facebook#44456) Summary: Self explanatory: https://developer.mozilla.org/en-US/docs/Web/CSS/CSS_positioned_layout/Understanding_z-index/Stacking_context#description and https://developer.mozilla.org/en-US/docs/Web/CSS/Containing_block#identifying_the_containing_block Changelog: [Internal] Reviewed By: NickGerleman Differential Revision: D55044674
Summary: Most filters are not going to work on iOS. It is a long story but essentially there is not a good way to continuously get a snapshot of the view and its descendants to filter. We can, however, implement `brightness` using `compositingFilter` and blend mode. This is really not documented at all, but if you assign a string representing the blend mode to the [`compositingFilter`](https://developer.apple.com/documentation/quartzcore/calayer/1410748-compositingfilter?language=objc) property on CALayer, it will actually work. The filter we use is [`multiplyBlendMode`](https://developer.apple.com/library/archive/documentation/GraphicsImaging/Reference/CoreImageFilterReference/index.html#//apple_ref/doc/filter/ci/CIMultiplyBlendMode). As the title suggests this just multiplies the two layers. We can apply this to a `_filterLayer` and set its background color to the brightness amount to get the desired results. Most other color filters either operate on the color components dependently (e.g. new red component depends the value in blue and green), or they have addition operations. We can do addition with `linearDodgeBlendMode`, but the order of operations does not work (we multiply, clamp, then add vs. multiply, add, then clamp). `opacity` is just a multiplier on the CALayer `opacity` property. Changelog: [Internal] Reviewed By: NickGerleman Differential Revision: D56447175
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Summary: Most filters are not going to work on iOS. It is a long story but essentially there is not a good way to continuously get a snapshot of the view and its descendants to filter. We can, however, implement `brightness` using `compositingFilter` and blend mode. This is really not documented at all, but if you assign a string representing the blend mode to the [`compositingFilter`](https://developer.apple.com/documentation/quartzcore/calayer/1410748-compositingfilter?language=objc) property on CALayer, it will actually work. The filter we use is [`multiplyBlendMode`](https://developer.apple.com/library/archive/documentation/GraphicsImaging/Reference/CoreImageFilterReference/index.html#//apple_ref/doc/filter/ci/CIMultiplyBlendMode). As the title suggests this just multiplies the two layers. We can apply this to a `_filterLayer` and set its background color to the brightness amount to get the desired results. Most other color filters either operate on the color components dependently (e.g. new red component depends the value in blue and green), or they have addition operations. We can do addition with `linearDodgeBlendMode`, but the order of operations does not work (we multiply, clamp, then add vs. multiply, add, then clamp). `opacity` is just a multiplier on the CALayer `opacity` property. Changelog: [Internal] Reviewed By: NickGerleman Differential Revision: D56447175
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This pull request was exported from Phabricator. Differential Revision: D56447175 |
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…k#44457) Summary: Most filters are not going to work on iOS. It is a long story but essentially there is not a good way to continuously get a snapshot of the view and its descendants to filter. We can, however, implement `brightness` using `compositingFilter` and blend mode. This is really not documented at all, but if you assign a string representing the blend mode to the [`compositingFilter`](https://developer.apple.com/documentation/quartzcore/calayer/1410748-compositingfilter?language=objc) property on CALayer, it will actually work. The filter we use is [`multiplyBlendMode`](https://developer.apple.com/library/archive/documentation/GraphicsImaging/Reference/CoreImageFilterReference/index.html#//apple_ref/doc/filter/ci/CIMultiplyBlendMode). As the title suggests this just multiplies the two layers. We can apply this to a `_filterLayer` and set its background color to the brightness amount to get the desired results. Most other color filters either operate on the color components dependently (e.g. new red component depends the value in blue and green), or they have addition operations. We can do addition with `linearDodgeBlendMode`, but the order of operations does not work (we multiply, clamp, then add vs. multiply, add, then clamp). `opacity` is just a multiplier on the CALayer `opacity` property. Changelog: [Internal] Reviewed By: NickGerleman Differential Revision: D56447175
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This pull request has been merged in c27f2ab. |
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Summary:
Most filters are not going to work on iOS. It is a long story but essentially there is not a good way to continuously get a snapshot of the view and its descendants to filter.
We can, however, implement
brightnessusingcompositingFilterand blend mode. This is really not documented at all, but if you assign a string representing the blend mode to thecompositingFilterproperty on CALayer, it will actually work. The filter we use ismultiplyBlendMode. As the title suggests this just multiplies the two layers. We can apply this to a_filterLayerand set its background color to the brightness amount to get the desired results. Most other color filters either operate on the color components dependently (e.g. new red component depends the value in blue and green), or they have addition operations. We can do addition withlinearDodgeBlendMode, but the order of operations does not work (we multiply, clamp, then add vs. multiply, add, then clamp).opacityis just a multiplier on the CALayeropacityproperty.Changelog: [Internal]
Reviewed By: NickGerleman
Differential Revision: D56447175