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Temporary implementation of Canvas.MeasureText

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This commit is contained in:
Paul Rouget 2019-09-21 09:36:53 +02:00
parent 748fa72320
commit 3695fb1eb4
11 changed files with 207 additions and 125 deletions
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15
components/script/dom/canvasrenderingcontext2d.rs
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@ -24,6 +24,7 @@ use crate::dom::globalscope::GlobalScope;
use crate::dom::htmlcanvaselement::{CanvasContext, HTMLCanvasElement};
use crate::dom::imagedata::ImageData;
use crate::dom::node::{Node, NodeDamage};
use crate::dom::textmetrics::TextMetrics;
use crate::unpremultiplytable::UNPREMULTIPLY_TABLE;
use canvas_traits::canvas::{Canvas2dMsg, CanvasId, CanvasMsg};
use canvas_traits::canvas::{CompositionOrBlending, FillOrStrokeStyle, FillRule};
@ -873,6 +874,15 @@ impl CanvasState {
self.send_canvas_2d_msg(Canvas2dMsg::FillText(parsed_text, x, y, max_width));
}
// https://html.spec.whatwg.org/multipage/#textmetrics
pub fn MeasureText(&self, global: &GlobalScope, _text: DOMString) -> DomRoot<TextMetrics> {
// FIXME: for now faking the implementation of MeasureText().
// See https://github.com/servo/servo/issues/5411#issuecomment-533776291
TextMetrics::new(
global, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0,
)
}
// https://html.spec.whatwg.org/multipage/#dom-context-2d-linewidth
pub fn LineWidth(&self) -> f64 {
self.state.borrow().line_width
@ -1671,6 +1681,11 @@ impl CanvasRenderingContext2DMethods for CanvasRenderingContext2D {
self.mark_as_dirty();
}
// https://html.spec.whatwg.org/multipage/#textmetrics
fn MeasureText(&self, text: DOMString) -> DomRoot<TextMetrics> {
self.canvas_state.borrow().MeasureText(&self.global(), text)
}
// https://html.spec.whatwg.org/multipage/#dom-context-2d-drawimage
fn DrawImage(&self, image: CanvasImageSource, dx: f64, dy: f64) -> ErrorResult {
self.canvas_state