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image/jpeg: make writeDQT do fewer array copies.
R=rsc, r CC=golang-dev https://golang.org/cl/4536069
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@ -302,14 +302,11 @@ func (e *encoder) writeMarkerHeader(marker uint8, markerlen int) {
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// writeDQT writes the Define Quantization Table marker.
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func (e *encoder) writeDQT() {
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markerlen := 2
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for _, q := range e.quant {
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markerlen += 1 + len(q)
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}
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markerlen := 2 + int(nQuantIndex)*(1+blockSize)
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e.writeMarkerHeader(dqtMarker, markerlen)
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for i, q := range e.quant {
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for i := range e.quant {
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e.writeByte(uint8(i))
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e.write(q[:])
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e.write(e.quant[i][:])
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}
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}
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