Speed up painting of qr codes.
Probably speeds it up by about a factor of two. Unfortunately it needs to be another 5x faster for sluggishness to disappear in the GUI when typing a description in the receive tab. Note the old code was off-by-one.
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@ -72,16 +72,13 @@ class QRCodeWidget(QWidget):
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qp.setBrush(white)
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qp.setPen(white)
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qp.drawRect(left-margin, top-margin, size+(margin*2), size+(margin*2))
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qp.setBrush(black)
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qp.setPen(black)
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for r in range(k):
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for c in range(k):
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if matrix[r][c]:
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qp.setBrush(black)
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qp.setPen(black)
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else:
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qp.setBrush(white)
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qp.setPen(white)
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qp.drawRect(left+c*boxsize, top+r*boxsize, boxsize, boxsize)
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qp.drawRect(left+c*boxsize, top+r*boxsize, boxsize - 1, boxsize - 1)
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qp.end()
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