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Protect against zero and negative indexes (-1 is used in e.g. "blank tilemap" example).

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This commit is contained in:
Pete Baron 2016-05-13 14:06:58 +12:00
parent 49b3d1a57a
commit 5be5ddba25
1 changed files with 10 additions and 2 deletions
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12
src/pixi/extras/Tilemap.js
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@ -244,7 +244,11 @@ PIXI.Tilemap.prototype._renderVisibleLayer = function( _layer, renderSession )
var layerRow = _layer.data[y]; var layerRow = _layer.data[y];
for(var x = firstX; x < lastX; x++) for(var x = firstX; x < lastX; x++)
{ {
this._renderTile(gl, shader, x * this.tileWide, y * this.tileHigh, layerRow[x].index - 1); var tile = layerRow[x].index - 1;
if ( tile > 0 )
{
this._renderTile(gl, shader, x * this.tileWide, y * this.tileHigh, tile - 1);
}
} }
} }
@ -300,7 +304,11 @@ PIXI.Tilemap.prototype._renderLayer = function( _layer, renderSession )
var layerRow = _layer.data[y]; var layerRow = _layer.data[y];
for(var x = 0; x < wide; x++) for(var x = 0; x < wide; x++)
{ {
this._renderTile(gl, shader, x * this.tileWide, y * this.tileHigh, layerRow[x].index - 1); var tile = layerRow[x].index - 1;
if ( tile > 0 )
{
this._renderTile(gl, shader, x * this.tileWide, y * this.tileHigh, tile - 1);
}
} }
} }