evert/svgcanvas
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when drawImage a empty C2S context

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Null pointer error will be thrown when ctx.drawImage(ctx) with an empty C2S context with no childNodes.

These code may fix the problem.
This commit is contained in:
Fu Zhen 2015-11-26 22:31:35 +08:00
parent ec6e29af6c
commit 8a8d081561
1 changed files with 14 additions and 10 deletions
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4
canvas2svg.js
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@ -1038,6 +1038,7 @@
//canvas2svg mock canvas context. In the future we may want to clone nodes instead. //canvas2svg mock canvas context. In the future we may want to clone nodes instead.
//also I'm currently ignoring dw, dh, sw, sh, sx, sy for a mock context. //also I'm currently ignoring dw, dh, sw, sh, sx, sy for a mock context.
svg = image.getSvg(); svg = image.getSvg();
if (svg.childNodes && svg.childNodes.length > 1) {
defs = svg.childNodes[0]; defs = svg.childNodes[0];
while(defs.childNodes.length) { while(defs.childNodes.length) {
id = defs.childNodes[0].getAttribute("id"); id = defs.childNodes[0].getAttribute("id");
@ -1045,10 +1046,13 @@
this.__defs.appendChild(defs.childNodes[0]); this.__defs.appendChild(defs.childNodes[0]);
} }
group = svg.childNodes[1]; group = svg.childNodes[1];
if (group) {
parent.appendChild(group); parent.appendChild(group);
this.__currentElement = group; this.__currentElement = group;
this.translate(dx, dy); this.translate(dx, dy);
this.__currentElement = currentElement; this.__currentElement = currentElement;
}
}
} else if(image.nodeName === "CANVAS" || image.nodeName === "IMG") { } else if(image.nodeName === "CANVAS" || image.nodeName === "IMG") {
//canvas or image //canvas or image
svgImage = this.__createElement("image"); svgImage = this.__createElement("image");