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image/png: make the CompressionLevel constants negative, reserving

positive numbers to mean a numeric zlib compression level.

LGTM=bradfitz, ruiu
R=bradfitz, ruiu
CC=golang-codereviews, jeff.allen
https://golang.org/cl/138860043
This commit is contained in:
Nigel Tao 2014-09-01 10:02:52 +10:00
parent a287567d3c
commit 686ecd83c0

View File

@ -33,10 +33,13 @@ type encoder struct {
type CompressionLevel int
const (
DefaultCompression CompressionLevel = iota
NoCompression
BestSpeed
BestCompression
DefaultCompression CompressionLevel = 0
NoCompression CompressionLevel = -1
BestSpeed CompressionLevel = -2
BestCompression CompressionLevel = -3
// Positive CompressionLevel values are reserved to mean a numeric zlib
// compression level, although that is not implemented yet.
)
// Big-endian.