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Merge pull request #2518 from pearcetm/fix-canvas

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Fix #2517
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Ian Gilman 2024-04-29 10:38:44 -07:00 committed by GitHub
commit d68a4024f8
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1 changed files with 8 additions and 3 deletions
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11
src/canvasdrawer.js
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@ -80,8 +80,6 @@ class CanvasDrawer extends OpenSeadragon.DrawerBase{
// Canvas default is "true", so this will only be changed if user specifies "false" in the options or via setImageSmoothinEnabled.
this._imageSmoothingEnabled = true;
this._viewportFlipped = false;
// Since the tile-drawn and tile-drawing events are fired by this drawer, make sure handlers can be added for them
this.viewer.allowEventHandler("tile-drawn");
this.viewer.allowEventHandler("tile-drawing");
@ -118,7 +116,6 @@ class CanvasDrawer extends OpenSeadragon.DrawerBase{
this._prepareNewFrame(); // prepare to draw a new frame
if(this.viewer.viewport.getFlip() !== this._viewportFlipped){
this._flip();
this._viewportFlipped = !this._viewportFlipped;
}
for(const tiledImage of tiledImages){
if (tiledImage.opacity !== 0) {
@ -189,6 +186,14 @@ class CanvasDrawer extends OpenSeadragon.DrawerBase{
context.restore();
}
/**
* Test whether the current context is flipped or not
* @private
*/
get _viewportFlipped(){
return this.context.getTransform().a < 0;
}
/**
* Fires the tile-drawing event.
* @private