[Webkit-unassigned] [Bug 100026] New: inconsistency in drawImage with target rect negative dimensions.

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=100026

           Summary: inconsistency in drawImage with target rect negative
                    dimensions.
           Product: WebKit
           Version: 528+ (Nightly build)
          Platform: Unspecified
        OS/Version: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: Canvas
        AssignedTo: webkit-unassigned at lists.webkit.org
        ReportedBy: arno at renevier.net


Hi,
when calling canvasContext.drawImage with either dw either dh negative, the behaviour is inconsistent:

If dw is -1, it is considered to be canvas.width but if it is -2 or below, the image is drawn from dx,dy but on the opposite side (flipped).

There are two ways to fix the inconsistency: either draw image flipped with -1 dimension, either forbids negative dimensions in destination rectangle (I tested opera and firefox, they both throw a INDEX_SIZE_ERR on that case).

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