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diff --git a/files/zh-cn/web/api/createimagebitmap/index.html b/files/zh-cn/web/api/createimagebitmap/index.html new file mode 100644 index 0000000000..c71c592551 --- /dev/null +++ b/files/zh-cn/web/api/createimagebitmap/index.html @@ -0,0 +1,208 @@ +--- +title: self.createImageBitmap() +slug: Web/API/createImageBitmap +translation_of: Web/API/WindowOrWorkerGlobalScope/createImageBitmap +original_slug: Web/API/WindowOrWorkerGlobalScope/createImageBitmap +--- +<div>{{APIRef("Canvas API")}}</div> + +<p><code><strong>createImageBitmap</strong></code> 方法存在 windows 和 workers 中. 它接受各种不同的图像来源, 并返回一个{{domxref("Promise")}}, resolve为{{domxref("ImageBitmap")}}. 可选地参数,图像被剪裁成自（sx，sy）且宽度为sw,高度为sh的像素的矩形。</p> + +<h2 id="Syntax">Syntax</h2> + +<pre>createImageBitmap(<em>image</em>[, options]).then(function(response) { ... }); +createImageBitmap(<em>image, sx, sy, sw, sh</em>[, options]).then(function(response) { ... }); +</pre> + +<h3 id="Parameters">Parameters</h3> + +<dl> + <dt><code>image</code></dt> + <dd>一个图像源, 可以是一个 {{HTMLElement("img")}}, SVG {{SVGElement("image")}}, {{HTMLElement("video")}}, {{HTMLElement("canvas")}}, {{domxref("HTMLImageElement")}}, {{domxref("SVGImageElement")}}, {{domxref("HTMLVideoElement")}}, {{domxref("HTMLCanvasElement")}}, {{domxref("Blob")}}, {{domxref("ImageData")}}, {{domxref("ImageBitmap")}}, 或 {{domxref("OffscreenCanvas")}} 对象.</dd> + <dt><code>sx</code></dt> + <dd>裁剪点x坐标.</dd> + <dt><code>sy</code></dt> + <dd>裁剪点y坐标.</dd> + <dt><code>sw</code></dt> + <dd>裁剪宽度,值可为负数.</dd> + <dt><code>sh</code></dt> + <dd>裁剪高度,值可为负数.</dd> + <dt>options {{optional_inline}}</dt> + <dd>为其设置选项的对象。可用的选项是: + <ul> + <li><code>imageOrientation</code>: 指示图像是按原样呈现还是垂直翻转. <code>none</code> (默认不翻转) 或 <code>flipY</code>.</li> + <li><code>premultiplyAlpha</code>: 指示位图颜色通道由alpha通道预乘. 选择其一:<code>none</code>, <code>premultiply</code>, 或 <code>default</code> (默认).</li> + <li><code>colorSpaceConversion</code>: 指示图像是否使用色彩空间转换进行解码. <code>none</code> 或 <code>default</code> (默认). The value <code>default</code> indicates that implementation-specific behavior is used.</li> + <li><code>resizeWidth</code>: 指示新宽度的长整数。</li> + <li><code>resizeHeight</code>: 指示新高度的长整数。</li> + <li><code>resizeQuality</code>: 指定图像缩放算法. 选择其一<code>pixelated</code>, <code>low</code> (默认), <code>medium</code>, 或 <code>high</code>.</li> + </ul> + </dd> +</dl> + +<h3 id="Return_value">Return value</h3> + +<p>返回一个解决ImageBitmap的{{domxref("Promise")}} ，当Promise成功时resolves接收一个包含所得到的矩形的位图数据{{domxref("ImageBitmap")}}。</p> + +<h2 id="Example">Example</h2> + +<pre class="brush: js language-js">var canvas = document.getElementById('myCanvas'), +ctx = canvas.getContext('2d'), +image = new Image(); + +image.onload = function() { + Promise.all([ + createImageBitmap(this, 0, 0, 32, 32), + createImageBitmap(this, 32, 0, 32, 32) + ]).then(function(sprites) { + ctx.drawImage(sprites[0], 0, 0); + ctx.drawImage(sprites[1], 32, 32); + }); +} + +image.src = 'sprites.png'; +</pre> + +<h2 id="Specifications">Specifications</h2> + +<table class="standard-table"> + <tbody> + <tr> + <th scope="col">Specification</th> + <th scope="col">Status</th> + <th scope="col">Comment</th> + </tr> + <tr> + <td>{{SpecName('HTML WHATWG', "webappapis.html#dom-createimagebitmap", "createImageBitmap")}}</td> + <td>{{Spec2('HTML WHATWG')}}</td> + <td> </td> + </tr> + </tbody> +</table> + +<h2 id="Browser_compatibility">Browser compatibility</h2> + +<p>{{ CompatibilityTable}}</p> + +<div id="compat-desktop"> +<table class="compat-table"> + <tbody> + <tr> + <th>Feature</th> + <th>Chrome</th> + <th>Firefox (Gecko)</th> + <th>Edge</th> + <th>Internet Explorer</th> + <th>Opera</th> + <th>Safari</th> + </tr> + <tr> + <td>Basic support</td> + <td>{{CompatChrome(50)}}</td> + <td> + <p>{{CompatGeckoDesktop(42)}}<br> + {{CompatGeckoDesktop(52)}}<sup>[1]</sup></p> + </td> + <td>{{CompatNo}}</td> + <td>{{CompatNo}}</td> + <td>{{CompatVersionUnknown}}</td> + <td>{{CompatNo}}</td> + </tr> + <tr> + <td><code>options</code> parameter</td> + <td>{{CompatChrome(52)}}</td> + <td>{{CompatUnknown}}</td> + <td>{{CompatNo}}</td> + <td>{{CompatNo}}</td> + <td>39</td> + <td>{{CompatNo}}</td> + </tr> + <tr> + <td><code>resizeWidth</code>, <code>resizeHeight</code>, and <code>resizeQuality</code></td> + <td>{{CompatChrome(54)}}</td> + <td>{{CompatUnknown}}</td> + <td>{{CompatNo}}</td> + <td>{{CompatNo}}</td> + <td>{{CompatUnknown}}</td> + <td>{{CompatNo}}</td> + </tr> + <tr> + <td><code>SVGImageElement</code> as source image</td> + <td>{{CompatChrome(59)}}</td> + <td>{{CompatUnknown}}</td> + <td>{{CompatNo}}</td> + <td>{{CompatNo}}</td> + <td>{{CompatUnknown}}</td> + <td>{{CompatNo}}</td> + </tr> + </tbody> +</table> +</div> + +<div id="compat-mobile"> +<table class="compat-table"> + <tbody> + <tr> + <th>Feature</th> + <th>Android Webview</th> + <th>Chrome for Android</th> + <th>Firefox Mobile (Gecko)</th> + <th>IE Mobile</th> + <th>Opera Mobile</th> + <th>Safari Mobile</th> + </tr> + <tr> + <td>Basic support</td> + <td>{{CompatChrome(50)}}</td> + <td>{{CompatChrome(50)}}</td> + <td> + <p>{{CompatGeckomobile(42)}}<br> + {{CompatGeckoMobile(52)}}<sup>[1]</sup></p> + </td> + <td>{{CompatUnknown}}</td> + <td>{{CompatVersionUnknown}}</td> + <td>{{CompatUnknown}}</td> + </tr> + <tr> + <td><code>options</code> parameter</td> + <td>{{CompatChrome(52)}}</td> + <td>{{CompatChrome(52)}}</td> + <td>{{CompatUnknown}}</td> + <td>{{CompatUnknown}}</td> + <td>39</td> + <td>{{CompatUnknown}}</td> + </tr> + <tr> + <td><code>resizeWidth</code>, <code>resizeHeight</code>, and <code>resizeQuality</code></td> + <td>{{CompatChrome(54)}}</td> + <td>{{CompatUnknown}}</td> + <td>{{CompatUnknown}}</td> + <td>{{CompatUnknown}}</td> + <td>{{CompatUnknown}}</td> + <td> </td> + </tr> + <tr> + <td><code>SVGImageElement</code> as source image</td> + <td>{{CompatChrome(59)}}</td> + <td>{{CompatChrome(59)}}</td> + <td>{{CompatUnknown}}</td> + <td>{{CompatUnknown}}</td> + <td>{{CompatUnknown}}</td> + <td>{{CompatUnknown}}</td> + </tr> + </tbody> +</table> +</div> + +<p>[1] <code>createImageBitmap()</code> now defined on {{domxref("WindowOrWorkerGlobalScope")}} mixin.</p> + +<h2 id="See_also">See also</h2> + +<ul> + <li>{{domxref("CanvasRenderingContext2D.drawImage()")}}</li> + <li>{{domxref("ImageData")}}</li> +</ul> + +<p> + <audio class="hidden"> </audio> +</p> |