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Try to prevent CanvasGraphics_getSinglePixelWidth from intermittently returning incorrect values in Firefox (issue 7188) #7330

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Aug 22, 2016
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Try to prevent CanvasGraphics_getSinglePixelWidth from intermittently returning incorrect values in Firefox (issue 7188) #7330

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6 changes: 6 additions & 0 deletions src/display/canvas.js
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Original file line number Diff line number Diff line change
Expand Up @@ -2298,7 +2298,13 @@ var CanvasGraphics = (function CanvasGraphicsClosure() {
},
getSinglePixelWidth: function CanvasGraphics_getSinglePixelWidth(scale) {
if (this.cachedGetSinglePixelWidth === null) {
// NOTE: The `save` and `restore` commands used below is a workaround
// that is necessary in order to prevent `mozCurrentTransformInverse`
// from intermittently returning incorrect values in Firefox, see:
// https://github.com/mozilla/pdf.js/issues/7188.
this.ctx.save();
var inverse = this.ctx.mozCurrentTransformInverse;
this.ctx.restore();
// max of the current horizontal and vertical scale
this.cachedGetSinglePixelWidth = Math.sqrt(Math.max(
(inverse[0] * inverse[0] + inverse[1] * inverse[1]),
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