third_party/WebKit/Source/modules/csspaint/README.md - Issue 2539333002: fix typo va => via

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Issue 2539333002: fix typo va => via (Closed)

Patch Set: Created 4 years ago

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1 # CSS Paint API	1 # CSS Paint API

2	2

3 This directory contains the implementation of the CSS Paint API.	3 This directory contains the implementation of the CSS Paint API.

4	4

5 See [CSS Paint API](https://drafts.css-houdini.org/css-paint-api/) for the web e xposed APIs this	5 See [CSS Paint API](https://drafts.css-houdini.org/css-paint-api/) for the web e xposed APIs this

6 implements.	6 implements.

7	7

8 ## Implementation	8 ## Implementation

9	9

10 ### [CSSPaintDefinition](CSSPaintDefinition.h)	10 ### [CSSPaintDefinition](CSSPaintDefinition.h)

11	11

12 Represents a class registered by the author through `PaintWorkletGlobalScope#reg isterPaint`.	12 Represents a class registered by the author through `PaintWorkletGlobalScope#reg isterPaint`.

13 Specifically this class holds onto the javascript constructor and paint function s of the class via	13 Specifically this class holds onto the javascript constructor and paint function s of the class via

14 persistent handles. This class keeps these functions alive so they don't get gar bage collected.	14 persistent handles. This class keeps these functions alive so they don't get gar bage collected.

15	15

16 The `CSSPaintDefinition` also holds onto an instance of the paint class va a per sistent handle. This	16 The `CSSPaintDefinition` also holds onto an instance of the paint class via a pe rsistent handle. This

17 instance is lazily created upon first use. If the constructor throws for some re ason the constructor	17 instance is lazily created upon first use. If the constructor throws for some re ason the constructor

18 is marked as invalid and will always produce invalid images.	18 is marked as invalid and will always produce invalid images.

19	19

20 The `PaintWorkletGlobalScope` has a map of paint `name` to `CSSPaintDefinition`.	20 The `PaintWorkletGlobalScope` has a map of paint `name` to `CSSPaintDefinition`.

21	21

22 ### [CSSPaintImageGenerator][generator] and [CSSPaintImageGeneratorImpl][generat or-impl]	22 ### [CSSPaintImageGenerator][generator] and [CSSPaintImageGeneratorImpl][generat or-impl]

23	23

24 `CSSPaintImageGenerator` represents the interface from which the `CSSPaintValue` can generate	24 `CSSPaintImageGenerator` represents the interface from which the `CSSPaintValue` can generate

25 `Image`s. This is done via the `CSSPaintImageGenerator#paint` method. Each `CSSP aintValue` owns a	25 `Image`s. This is done via the `CSSPaintImageGenerator#paint` method. Each `CSSP aintValue` owns a

26 separate instance of `CSSPaintImageGenerator`.	26 separate instance of `CSSPaintImageGenerator`.

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55 During style invalidation `ComputedStyle` checks if it has any `CSSPaintValue`s, and if any of their	55 During style invalidation `ComputedStyle` checks if it has any `CSSPaintValue`s, and if any of their

56 properties have changed; if so it will invalidate paint for that `ComputedStyle` .	56 properties have changed; if so it will invalidate paint for that `ComputedStyle` .

57	57

58 If the `CSSPaintValue` doesn't have a corresponding `CSSPaintDefinition` yet, it doesn't invalidate	58 If the `CSSPaintValue` doesn't have a corresponding `CSSPaintDefinition` yet, it doesn't invalidate

59 paint.	59 paint.

60	60

61 ## Testing	61 ## Testing

62	62

63 Tests live [here](../../../LayoutTests/csspaint/).	63 Tests live [here](../../../LayoutTests/csspaint/).

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