third_party/WebKit/Source/modules/csspaint/README.md - Issue 1896893004: Hook up style invalidation for CSS Paint API.

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Issue 1896893004: Hook up style invalidation for CSS Paint API. (Closed) Base URL: https://chromium.googlesource.com/chromium/src.git@css-paint-register

Patch Set: rebase. Created 4 years, 7 months 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)

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42 ### Generating a [PaintGeneratedImage](../../platform/graphics/PaintGeneratedIma ge.h)	42 ### Generating a [PaintGeneratedImage](../../platform/graphics/PaintGeneratedIma ge.h)

43	43

44 `PaintGeneratedImage` is a `Image` which just paints a single `SkPicture`.	44 `PaintGeneratedImage` is a `Image` which just paints a single `SkPicture`.

45	45

46 A `CSSPaintValue` can generate an image from the method `CSSPaintImageGenerator# paint`. This method	46 A `CSSPaintValue` can generate an image from the method `CSSPaintImageGenerator# paint`. This method

47 calls through to `CSSPaintDefinition#paint` which actually invokes the javascrip t paint method.	47 calls through to `CSSPaintDefinition#paint` which actually invokes the javascrip t paint method.

48 This method returns the `PaintGeneratedImage`.	48 This method returns the `PaintGeneratedImage`.

49	49

50 The `SkPicture` is produced from a `RecordingImageBufferSurface`.	50 The `SkPicture` is produced from a `RecordingImageBufferSurface`.

51	51

	52 ### Style Invalidation

	53

	54 The `CSSPaintDefinition` keeps a list of both native and custom properties it wi ll invalidate on.

	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` .

	57

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

	59 paint.

	60

52 ## Testing	61 ## Testing

53	62

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

55	64

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