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This implements flutter/flutter#126342 This implements `ImageFilter`, `ColorFilter` and `MaskFilter` in Skwasm. This includes support on the `Paint` object, as well as the `SceneBuilder` layers that use these types.
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| Original file line number | Diff line number | Diff line change |
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| @@ -0,0 +1,25 @@ | ||
| // Copyright 2013 The Flutter Authors. All rights reserved. | ||
| // Use of this source code is governed by a BSD-style license that can be | ||
| // found in the LICENSE file. | ||
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| import 'package:ui/ui.dart' as ui; | ||
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| // These are additional APIs that are not part of the `dart:ui` interface that | ||
| // are needed internally to properly implement a `SceneBuilder` on top of the | ||
| // generic Canvas/Picture api. | ||
| abstract class SceneCanvas implements ui.Canvas { | ||
| // This is the same as a normal `saveLayer` call, but we can pass a backdrop image filter. | ||
| void saveLayerWithFilter(ui.Rect? bounds, ui.Paint paint, ui.ImageFilter backdropFilter); | ||
| } | ||
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| abstract class ScenePicture implements ui.Picture { | ||
| // This is a conservative bounding box of all the drawing primitives in this picture. | ||
| ui.Rect get cullRect; | ||
| } | ||
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| abstract class SceneImageFilter implements ui.ImageFilter { | ||
| // Since some image filters affect the actual drawing bounds of a given picture, this | ||
| // gives the maximum draw boundary for a picture with the given input bounds after it | ||
| // has been processed by the filter. | ||
| ui.Rect filterBounds(ui.Rect inputBounds); | ||
| } |
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lib/web_ui/lib/src/engine/skwasm/skwasm_impl/filters.dart
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| Original file line number | Diff line number | Diff line change |
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| @@ -0,0 +1,132 @@ | ||
| // Copyright 2013 The Flutter Authors. All rights reserved. | ||
| // Use of this source code is governed by a BSD-style license that can be | ||
| // found in the LICENSE file. | ||
|
|
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| import 'dart:ffi'; | ||
| import 'dart:typed_data'; | ||
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| import 'package:ui/src/engine.dart'; | ||
| import 'package:ui/src/engine/skwasm/skwasm_impl.dart'; | ||
| import 'package:ui/ui.dart' as ui; | ||
|
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| class SkwasmImageFilter implements SceneImageFilter { | ||
| SkwasmImageFilter._(this.handle); | ||
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| factory SkwasmImageFilter.blur({ | ||
| double sigmaX = 0.0, | ||
| double sigmaY = 0.0, | ||
| ui.TileMode tileMode = ui.TileMode.clamp, | ||
| }) => SkwasmImageFilter._(imageFilterCreateBlur(sigmaX, sigmaY, tileMode.index)); | ||
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| factory SkwasmImageFilter.dilate({ | ||
| double radiusX = 0.0, | ||
| double radiusY = 0.0, | ||
| }) => SkwasmImageFilter._(imageFilterCreateDilate(radiusX, radiusY)); | ||
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| factory SkwasmImageFilter.erode({ | ||
| double radiusX = 0.0, | ||
| double radiusY = 0.0, | ||
| }) => SkwasmImageFilter._(imageFilterCreateErode(radiusX, radiusY)); | ||
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| factory SkwasmImageFilter.matrix( | ||
| Float64List matrix4, { | ||
| ui.FilterQuality filterQuality = ui.FilterQuality.low | ||
| }) => withStackScope((StackScope scope) => SkwasmImageFilter._(imageFilterCreateMatrix( | ||
| scope.convertMatrix4toSkMatrix(matrix4), | ||
| filterQuality.index | ||
| ))); | ||
|
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| factory SkwasmImageFilter.fromColorFilter(SkwasmColorFilter filter) => | ||
| SkwasmImageFilter._(imageFilterCreateFromColorFilter(filter.handle)); | ||
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| factory SkwasmImageFilter.fromUiFilter(ui.ImageFilter filter) { | ||
| if (filter is ui.ColorFilter) { | ||
| final SkwasmColorFilter colorFilter = | ||
| SkwasmColorFilter.fromEngineColorFilter(filter as EngineColorFilter); | ||
| final SkwasmImageFilter outputFilter = SkwasmImageFilter.fromColorFilter(colorFilter); | ||
| colorFilter.dispose(); | ||
| return outputFilter; | ||
| } else { | ||
| return filter as SkwasmImageFilter; | ||
| } | ||
| } | ||
|
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| factory SkwasmImageFilter.compose( | ||
| ui.ImageFilter outer, | ||
| ui.ImageFilter inner, | ||
| ) { | ||
| final SkwasmImageFilter nativeOuter = SkwasmImageFilter.fromUiFilter(outer); | ||
| final SkwasmImageFilter nativeInner = SkwasmImageFilter.fromUiFilter(inner); | ||
| return SkwasmImageFilter._(imageFilterCompose(nativeOuter.handle, nativeInner.handle)); | ||
| } | ||
|
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| void dispose() { | ||
| if (!_isDisposed) { | ||
| imageFilterDispose(handle); | ||
| _isDisposed = true; | ||
| } | ||
| } | ||
|
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| final ImageFilterHandle handle; | ||
| bool _isDisposed = false; | ||
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| @override | ||
| ui.Rect filterBounds(ui.Rect inputBounds) => withStackScope((StackScope scope) { | ||
| final RawIRect rawRect = scope.convertIRectToNative(inputBounds); | ||
| imageFilterGetFilterBounds(handle, rawRect); | ||
| return scope.convertIRectFromNative(rawRect); | ||
| }); | ||
| } | ||
|
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| class SkwasmColorFilter { | ||
| SkwasmColorFilter._(this.handle); | ||
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| factory SkwasmColorFilter.fromEngineColorFilter(EngineColorFilter colorFilter) => | ||
| switch (colorFilter.type) { | ||
| ColorFilterType.mode => SkwasmColorFilter._(colorFilterCreateMode( | ||
| colorFilter.color!.value, | ||
| colorFilter.blendMode!.index, | ||
| )), | ||
| ColorFilterType.linearToSrgbGamma => SkwasmColorFilter._(colorFilterCreateLinearToSRGBGamma()), | ||
| ColorFilterType.srgbToLinearGamma => SkwasmColorFilter._(colorFilterCreateSRGBToLinearGamma()), | ||
| ColorFilterType.matrix => withStackScope((StackScope scope) { | ||
| final Pointer<Float> nativeMatrix = scope.convertDoublesToNative(colorFilter.matrix!); | ||
| return SkwasmColorFilter._(colorFilterCreateMatrix(nativeMatrix)); | ||
| }), | ||
| }; | ||
|
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| factory SkwasmColorFilter.composed( | ||
| SkwasmColorFilter outer, | ||
| SkwasmColorFilter inner, | ||
| ) => SkwasmColorFilter._(colorFilterCompose(outer.handle, inner.handle)); | ||
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| void dispose() { | ||
| if (!_isDisposed) { | ||
| colorFilterDispose(handle); | ||
| _isDisposed = true; | ||
| } | ||
| } | ||
|
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| final ColorFilterHandle handle; | ||
| bool _isDisposed = false; | ||
| } | ||
|
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| class SkwasmMaskFilter { | ||
| SkwasmMaskFilter._(this.handle); | ||
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| factory SkwasmMaskFilter.fromUiMaskFilter(ui.MaskFilter maskFilter) => | ||
| SkwasmMaskFilter._(maskFilterCreateBlur( | ||
| maskFilter.webOnlyBlurStyle.index, | ||
| maskFilter.webOnlySigma | ||
| )); | ||
|
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| final MaskFilterHandle handle; | ||
| bool _isDisposed = false; | ||
|
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| void dispose() { | ||
| if (!_isDisposed) { | ||
| maskFilterDispose(handle); | ||
| _isDisposed = true; | ||
| } | ||
| } | ||
| } |
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