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zh-CN: create extensionTypes.ImageDetails (#23534)
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Co-authored-by: A1lo <[email protected]>
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PassionPenguin and yin1999 authored Sep 21, 2024
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---
title: extensionTypes.ImageDetails
slug: Mozilla/Add-ons/WebExtensions/API/extensionTypes/ImageDetails
l10n:
sourceCommit: b8a0743ca8b1e1b1b1a95cc93a4413c020f11262
---

{{AddonSidebar}}

有关捕获图片格式、质量、区域和比例的详细信息。

## 类型

该类型的取值是对象,包含下列属性:

- `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,并将被转换为 0—1 之间的取值作为 [`HTMLCanvasElement.toDataURL()`](/zh-CN/docs/Web/API/HTMLCanvasElement/toDataURL) 方法的 `encoderOptions` 参数传递给函数。在属性被忽略时将采用 92 作为默认取值。随着质量的降低,结果图片将有更多视觉伪影,存储所需的字节数也将减少。当图片格式设置为 PNG 时,该值将被忽略。
- `rect` {{optional_inline}}

- : `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:

- `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。

该选项在 Firefox 82 中引入。若省略该属性,则将捕获当前可视视口。

- `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。

## 浏览器兼容性

{{Compat}}

{{WebExtExamples}}

> [!NOTE]
> 此 API 基于 Chromium 的 [`chrome.extensionTypes`](https://developer.chrome.com/docs/extensions/reference/api/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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