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more robust fontMatrix parsing, error checking

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This commit is contained in:
Artur Adib 2012-01-20 14:55:52 -05:00
parent 38d28ecb2e
commit 66eff7a5cb
2 changed files with 19 additions and 1 deletions
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10
src/canvas.js
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@ -551,6 +551,16 @@ var CanvasGraphics = (function CanvasGraphicsClosure() {
throw 'Can\'t find font for ' + fontRefName;
}
// If any of the diagonal elements of a transformation matrix are null
// ctx.restore() will fail in FF. See bugzilla bug #719844.
if (fontObj.fontMatrix[0] === 0 ||
fontObj.fontMatrix[3] === 0 ) {
warn('Invalid font matrix for font ' + fontRefName);
// Fallback
fontObj.fontMatrix = IDENTITY_MATRIX;
}
var name = fontObj.loadedName || 'sans-serif';
this.current.font = fontObj;