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files/zh-cn/mozilla/add-ons/webextensions/api/extensiontypes/imagedetails/index.md
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title: extensionTypes.ImageDetails | ||
slug: Mozilla/Add-ons/WebExtensions/API/extensionTypes/ImageDetails | ||
l10n: | ||
sourceCommit: a16fecbf75f71fc11e03ef6cd0b0c34ad6f3d480 | ||
--- | ||
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{{AddonSidebar}} | ||
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有关图片格式、质量、区域和缩放的详细信息。 | ||
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## 类型 | ||
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该类型的取值是对象,包含下列属性: | ||
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- `format` {{optional_inline}} | ||
- : {{WebExtAPIRef('extensionTypes.ImageFormat')}}。结果图片的格式,默认为 `"png"`。 | ||
- `quality` {{optional_inline}} | ||
- : `integer`。当格式是 `"jpeg"` 时,这将决定结果图片的质量。这应是 0—100 之间的数字并将转为 0—1 之间的值,传递为 [`HTMLCanvasElement.toDataURL()`](/zh-CN/docs/Web/API/HTMLCanvasElement/toDataURL) 方法的 `encoderOptions` 参数。若省略该属性则将使用 92 作为取值。随着质量的降低,结果图片将有更多视觉伪影,存储所需的字节数将减少。对于 PNG 图片,该值将被忽略。 | ||
- `rect` {{optional_inline}} | ||
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- : `object`,指定要捕获的文档区域,单位为 CSS 像素,相对于页面。所有属性默认为 `0`。这些属性是: | ||
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- `x`:矩形左侧的坐标。 | ||
- `y`:矩形顶部的坐标。 | ||
- `width`:矩形的宽度。 | ||
- `height`:矩形的高度。 | ||
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该选项在 Firefox 82 中引入。若省略,则捕获当前可见视口。 | ||
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- `scale` {{optional_inline}} | ||
- : `number`,渲染的比例,默认为 [`devicePixelRatio`](/zh-CN/docs/Web/API/Window/devicePixelRatio)。该选项在 Firefox 82 中引入。 | ||
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## 浏览器兼容性 | ||
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{{Compat}} | ||
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{{WebExtExamples}} | ||
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> [!NOTE] | ||
> 此 API 基于 Chromium 的 [`chrome.extensionTypes`](https://developer.chrome.com/docs/extensions/reference/extensionTypes/#type-ImageDetails) API。该文档衍生自 Chromium 代码中的 [`extension_types.json`](https://chromium.googlesource.com/chromium/src/+/master/extensions/common/api/extension_types.json)。 | ||
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