Pattern no-repeat support

[Renato Formato]

Hi,
here is a patch against the HEAD to support no-repeat for patterns.
It works with translations and scaling, but not with rotations,
because the only way I've found to make it work is rotate the shape
itself, while current implementation does not rotate shapes but
transform its path.

I should have already signed the CLA

Index: excanvas.js
===================================================================
--- excanvas.js (revisione 73)
+++ excanvas.js (copia locale)
@@ -1069,15 +1069,16 @@
' focusposition="', focus.x, ',', focus.y, '" /
>');
} else if (fillStyle instanceof CanvasPattern_) {
if (width && height) {
- var deltaLeft = -min.x;
- var deltaTop = -min.y;
+ var wi = fillStyle.width_ * Z, hi = fillStyle.height_ * Z;
+ var deltaLeft = - width/2 + ctx.m_[2][0] * Z - min.x;
+ var deltaTop = - height/2 + ctx.m_[2][1] * Z - min.y;
lineStr.push('<g_vml_:fill',
+ ' origin="'+
(fillStyle.repetition_=="repeat"?"0,0":"-0.5,-0.5")+'"',
' position="',
- deltaLeft / width * arcScaleX * arcScaleX, ',',
- deltaTop / height * arcScaleY * arcScaleY, '"',
- ' type="tile"',
- // TODO: Figure out the correct size to fit the
scale.
- //' size="', w, 'px ', h, 'px"',
+ deltaLeft / width , ',',
+ deltaTop / height , '"',
+ ' type="'+
(fillStyle.repetition_=="repeat"?"tile":"frame")+'"',
+ ' size="', wi / width * arcScaleX , ',', hi /
height * arcScaleY , '"',
' src="', fillStyle.src_, '" />');
}
} else {