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image/jpeg: for progressive JPEGs, the first SOS segment doesn't

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necessarily contain all components.

Fixes #4975.

R=r, minux.ma, bradfitz
CC=golang-dev
https://golang.org/cl/7469043
This commit is contained in:
Nigel Tao 2013-03-06 10:08:46 +11:00
parent a22361d68d
commit 0d9bf2757e
1 changed files with 5 additions and 3 deletions
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8
src/pkg/image/jpeg/scan.go
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@ -109,9 +109,11 @@ func (d *decoder) processSOS(n int) error {
myy := (d.height + 8*v0 - 1) / (8 * v0)
if d.img1 == nil && d.img3 == nil {
d.makeImg(h0, v0, mxx, myy)
if d.progressive {
for i := 0; i < nComp; i++ {
compIndex := scan[i].compIndex
}
if d.progressive {
for i := 0; i < nComp; i++ {
compIndex := scan[i].compIndex
if d.progCoeffs[compIndex] == nil {
d.progCoeffs[compIndex] = make([]block, mxx*myy*d.comp[compIndex].h*d.comp[compIndex].v)
}
}