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LibWeb: Add Canvas Context2D basic text align and text baseline support

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Add the CanvasTextDrawingStyles mixin with the textAlign and
textBaseline attributes. Update fill_text in CanvasRenderingContext2D
to move the text rect by the text align and text baseline attributes.
Wrote a simple HTML example to showcase the new features.
This commit is contained in:
Bastiaan van der Plaat 2023-08-03 12:18:17 +02:00 • committed by Andreas Kling
parent e689422564
commit 220e34b69d
9 changed files with 159 additions and 9 deletions
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7
Userland/Libraries/LibWeb/HTML/CanvasRenderingContext2D.idl
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@ -7,6 +7,7 @@
#import <HTML/Canvas/CanvasImageSmoothing.idl>
#import <HTML/Canvas/CanvasPath.idl>
#import <HTML/Canvas/CanvasPathDrawingStyles.idl>
#import <HTML/Canvas/CanvasTextDrawingStyles.idl>
#import <HTML/Canvas/CanvasRect.idl>
#import <HTML/Canvas/CanvasState.idl>
#import <HTML/Canvas/CanvasText.idl>
@ -14,6 +15,10 @@
enum ImageSmoothingQuality { "low", "medium", "high" };
// FIXME: This should be in CanvasTextDrawingStyles.idl but then it is not exported
enum CanvasTextAlign { "start", "end", "left", "right", "center" };
enum CanvasTextBaseline { "top", "hanging", "middle", "alphabetic", "ideographic", "bottom" };
// https://html.spec.whatwg.org/multipage/canvas.html#canvasrenderingcontext2d
[Exposed=Window]
interface CanvasRenderingContext2D {
@ -34,5 +39,5 @@ CanvasRenderingContext2D includes CanvasText;
CanvasRenderingContext2D includes CanvasDrawImage;
CanvasRenderingContext2D includes CanvasImageData;
CanvasRenderingContext2D includes CanvasPathDrawingStyles;
// FIXME: CanvasRenderingContext2D includes CanvasTextDrawingStyles;
CanvasRenderingContext2D includes CanvasTextDrawingStyles;
CanvasRenderingContext2D includes CanvasPath;