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Merge pull request #1222 from openseadragon/ig-safari

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Fixed issue with transparent images disappearing on Safari
This commit is contained in:
Ian Gilman 2017-06-23 10:40:30 -07:00 committed by GitHub
commit 928404c520
1 changed files with 6 additions and 6 deletions
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12
src/drawer.js
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@ -426,22 +426,22 @@ $.Drawer.prototype = {
this.context.globalCompositeOperation = compositeOperation; this.context.globalCompositeOperation = compositeOperation;
} }
if (bounds) { if (bounds) {
// Internet Explorer and Microsoft Edge throw IndexSizeError // Internet Explorer, Microsoft Edge, and Safari have problems
// when you call context.drawImage with negative x or y // when you call context.drawImage with negative x or y
// or width or height greater than the canvas width or height respectively // or x + width or y + height greater than the canvas width or height respectively.
if (bounds.x < 0) { if (bounds.x < 0) {
bounds.width += bounds.x; bounds.width += bounds.x;
bounds.x = 0; bounds.x = 0;
} }
if (bounds.width > this.canvas.width) { if (bounds.x + bounds.width > this.canvas.width) {
bounds.width = this.canvas.width; bounds.width = this.canvas.width - bounds.x;
} }
if (bounds.y < 0) { if (bounds.y < 0) {
bounds.height += bounds.y; bounds.height += bounds.y;
bounds.y = 0; bounds.y = 0;
} }
if (bounds.height > this.canvas.height) { if (bounds.y + bounds.height > this.canvas.height) {
bounds.height = this.canvas.height; bounds.height = this.canvas.height - bounds.y;
} }
this.context.drawImage( this.context.drawImage(