625268 - consider batching together drawImage calls

Status: NEW

(Core :: Graphics: Canvas2D, defect)

Description

[Vladimir Vukicevic [:vlad] [:vladv] (needinfo me, slow to respond)]

On some platforms, notably D2D, we can do a many-to-many drawImage type draw in one call.  We should consider batching up drawImage calls that use the same source and issuing them in one call if possible.  This would mean that the other drawing commands would need to flush any batched up calls, but there aren't that many of those (stroke, fill, drawImage, some of the text APIs, drawWindow).