skia2/experimental/canvaskit/htmlcanvas/htmlcanvas.js
Kevin Lubick a40f832ae1 [canvaskit] Add Path2D to Canvas API
This moves the shared logic into path2d.js from
canvas2dcontext.js.

Bug: skia:
Change-Id: Id63bc52a190109f7cbc4e17ddb5603e6e87d5dc0
Reviewed-on: https://skia-review.googlesource.com/c/178268
Reviewed-by: Joe Gregorio <jcgregorio@google.com>
2018-12-17 21:19:48 +00:00

81 lines
2.1 KiB
JavaScript

CanvasKit.MakeCanvas = function(width, height) {
var surf = CanvasKit.MakeSurface(width, height);
if (surf) {
return new HTMLCanvas(surf);
}
return null;
}
function HTMLCanvas(skSurface) {
this._surface = skSurface;
this._context = new CanvasRenderingContext2D(skSurface.getCanvas());
this._toCleanup = [];
this._fontmgr = CanvasKit.SkFontMgr.RefDefault();
// Data is either an ArrayBuffer, a TypedArray, or a Node Buffer
this.decodeImage = function(data) {
var img = CanvasKit.MakeImageFromEncoded(data);
if (!img) {
throw 'Invalid input';
}
this._toCleanup.push(img);
return img;
}
this.loadFont = function(buffer, descriptors) {
var newFont = this._fontmgr.MakeTypefaceFromData(buffer);
if (!newFont) {
SkDebug('font could not be processed', descriptors);
return null;
}
this._toCleanup.push(newFont);
addToFontCache(newFont, descriptors);
}
this.makePath2D = function(path) {
var p2d = new Path2D(path);
this._toCleanup.push(p2d._getPath());
return p2d;
}
// A normal <canvas> requires that clients call getContext
this.getContext = function(type) {
if (type === '2d') {
return this._context;
}
return null;
}
this.toDataURL = function(codec, quality) {
// TODO(kjlubick): maybe support other codecs (webp?)
// For now, just to png and jpeg
this._surface.flush();
var img = this._surface.makeImageSnapshot();
if (!img) {
SkDebug('no snapshot');
return;
}
var codec = codec || 'image/png';
var format = CanvasKit.ImageFormat.PNG;
if (codec === 'image/jpeg') {
format = CanvasKit.ImageFormat.JPEG;
}
var quality = quality || 0.92;
var skimg = img.encodeToData(format, quality);
if (!skimg) {
SkDebug('encoding failure');
return
}
var imgBytes = CanvasKit.getSkDataBytes(skimg);
return 'data:' + codec + ';base64,' + toBase64String(imgBytes);
}
this.dispose = function() {
this._context._dispose();
this._toCleanup.forEach(function(i) {
i.delete();
});
this._surface.dispose();
}
}