copy(cdat2, cdat0)
			filterPaeth(cdat1, pdat1, bytesPerPixel)
			slowFilterPaeth(cdat2, pdat2, bytesPerPixel)
			if !bytes.Equal(cdat1, cdat2) {
				t.Errorf("bytesPerPixel: %d\npdat0: % x\ncdat0: % x\ngot:   % x\nwant:  % x", bytesPerPixel, pdat0, cdat0, cdat1, cdat2)
				break
			}
		}
	}

					rcol := uint16(cdat[6*x+0])<<8 | uint16(cdat[6*x+1])
					gcol := uint16(cdat[6*x+2])<<8 | uint16(cdat[6*x+3])
					bcol := uint16(cdat[6*x+4])<<8 | uint16(cdat[6*x+5])
					rgba64.SetRGBA64(x, y, color.RGBA64{rcol, gcol, bcol, 0xffff})
				}
			}
		case cbTCA16:
			for x := 0; x < width; x++ {
				rcol := uint16(cdat[8*x+0])<<8 | uint16(cdat[8*x+1])
				gcol := uint16(cdat[8*x+2])<<8 | uint16(cdat[8*x+3])

		return b
	}
	return c
}

// filterPaeth applies the Paeth filter to the cdat slice.
// cdat is the current row's data, pdat is the previous row's data.
func filterPaeth(cdat, pdat []byte, bytesPerPixel int) {
	var a, b, c, pa, pb, pc int
	for i := 0; i < bytesPerPixel; i++ {
		a, c = 0, 0
		for j := i; j < len(cdat); j += bytesPerPixel {
			b = int(pdat[j])
			pa = b - c
			pb = a - c
			pc = abs(pa + pb)
			pa = abs(pa)

	// in their enumeration order (ftNone, ftSub, ftUp, ftAverage, ftPaeth).
	cdat0 := cr[0][1:]
	cdat1 := cr[1][1:]
	cdat2 := cr[2][1:]
	cdat3 := cr[3][1:]
	cdat4 := cr[4][1:]
	pdat := pr[1:]
	n := len(cdat0)

	// The up filter.
	sum := 0
	for i := 0; i < n; i++ {
		cdat2[i] = cdat0[i] - pdat[i]
		sum += abs8(cdat2[i])
	}
	best := sum
	filter := ftUp

	// The Paeth filter.
	sum = 0

Russ Cox <******@****.***> 1620744764 -0400

Russ Cox <******@****.***> 1410149331 -0400

nl.ca
ns.ca
nt.ca
nu.ca
on.ca
pe.ca
qc.ca
sk.ca
yk.ca
// gc.ca: https://en.wikipedia.org/wiki/.gc.ca
// see also: http://registry.gc.ca/en/SubdomainFAQ
gc.ca

// cat : https://en.wikipedia.org/wiki/.cat
cat

// cc : https://en.wikipedia.org/wiki/.cc
cc

// cd : https://en.wikipedia.org/wiki/.cd
// see also: https://www.nic.cd/domain/insertDomain_2.jsp?act=1
cd
gov.cd

Jes Cok <******@****.***> 1687506468 +0000

        writer.endCDATA()
        writer.endElement()

        then:
        xml == "<?xml version=\"1.0\" encoding=\"UTF-8\"?><root><![CDATA[丈, ]]>&#x1f603;<![CDATA[, and नि]]><![CDATA[x丈, नि, ]]>&#x1f603;<![CDATA[]]></root>"
    }

    def "writes CDATA"() {
        when:
        writer.startElement("root")
        writer.startElement("stuff")

        writer.startCDATA()

    <system-out><![CDATA[m2-out-1]]></system-out>
    <system-err><![CDATA[m2-err-1]]></system-err>
    <rerunFailure message="m2-message-2" type="ExceptionType">
      <stackTrace>m2-stackTrace-2</stackTrace>
      <system-out><![CDATA[m2-out-2]]></system-out>
      <system-err><![CDATA[m2-err-2]]></system-err>
    </rerunFailure>
  </testcase>
  <system-out><![CDATA[class-out]]></system-out>
  <system-err><![CDATA[class-err]]></system-err>