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Auto merge of #24261 - paulrouget:fakeMeasureTExt, r=jdm

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Temporary implementation of Canvas.MeasureText

@jdm: that will help with the babylonjs demos. Another approach is to implement that in JS and add it to the demos.

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bors-servo 2019-09-25 11:38:36 -04:00 • committed by GitHub
commit cf725fc3f5
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11 changed files with 207 additions and 122 deletions
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3
components/script/dom/webidls/CanvasRenderingContext2D.webidl
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@ -153,7 +153,8 @@ interface CanvasText {
optional unrestricted double maxWidth);
//void strokeText(DOMString text, unrestricted double x, unrestricted double y,
// optional unrestricted double maxWidth);
//TextMetrics measureText(DOMString text);
[Pref="dom.canvas-text.enabled"]
TextMetrics measureText(DOMString text);
};
[Exposed=(PaintWorklet, Window, Worker), NoInterfaceObject]

23
components/script/dom/webidls/TextMetrics.webidl Normal file
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@ -0,0 +1,23 @@
/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at https://mozilla.org/MPL/2.0/. */
// https://html.spec.whatwg.org/multipage/#textmetrics
[Exposed=(PaintWorklet, Window, Worker), Pref="dom.canvas-text.enabled"]
interface TextMetrics {
// x-direction
readonly attribute double width; // advance width
readonly attribute double actualBoundingBoxLeft;
readonly attribute double actualBoundingBoxRight;
// y-direction
readonly attribute double fontBoundingBoxAscent;
readonly attribute double fontBoundingBoxDescent;
readonly attribute double actualBoundingBoxAscent;
readonly attribute double actualBoundingBoxDescent;
readonly attribute double emHeightAscent;
readonly attribute double emHeightDescent;
readonly attribute double hangingBaseline;
readonly attribute double alphabeticBaseline;
readonly attribute double ideographicBaseline;
};