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x/image/bmp: support 4-bit format #58005

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susanhuhu opened this issue Jan 25, 2023 · 9 comments
Open

x/image/bmp: support 4-bit format #58005

susanhuhu opened this issue Jan 25, 2023 · 9 comments
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FeatureRequest NeedsInvestigation Someone must examine and confirm this is a valid issue and not a duplicate of an existing one.
Milestone
Unreleased

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@susanhuhu
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susanhuhu commented Jan 25, 2023 •
edited

What version of Go are you using (go version)?

$ go version 1.18

Does this issue reproduce with the latest release?

Yes

What operating system and processor architecture are you using (go env)?

go env Output $ go env

GO111MODULE=""
GOARCH="amd64"
GOBIN=""
GOCACHE="/root/.cache/go-build"
GOENV="/root/.config/go/env"
GOEXE=""
GOEXPERIMENT=""
GOFLAGS=""
GOHOSTARCH="amd64"
GOHOSTOS="linux"
GOINSECURE=""
GOMODCACHE="/root/go/pkg/mod"
GONOPROXY=""
GONOSUMDB=""
GOOS="linux"
GOPATH="/root/go"
GOPRIVATE=""
GOPROXY="https://proxy.golang.org,direct"
GOROOT="/snap/go/10030"
GOSUMDB="sum.golang.org"
GOTMPDIR=""
GOTOOLDIR="/snap/go/10030/pkg/tool/linux_amd64"
GOVCS=""
GOVERSION="go1.19.5"
GCCGO="gccgo"
GOAMD64="v1"
AR="ar"
CC="gcc"
CXX="g++"
CGO_ENABLED="1"
GOMOD="/home/xxx/go/src/yyy/go.mod"
GOWORK=""
CGO_CFLAGS="-g -O2"
CGO_CPPFLAGS=""
CGO_CXXFLAGS="-g -O2"
CGO_FFLAGS="-g -O2"
CGO_LDFLAGS="-g -O2"
PKG_CONFIG="pkg-config"
GOGCCFLAGS="-fPIC -m64 -pthread -Wl,--no-gc-sections -fmessage-length=0 -fdebug-prefix-map=/tmp/go-build3498157493=/tmp/go-build -gno-record-gcc-switches"


### What did you do?

call image.DecodeConfig(bytes.NewReader(data))  for attached image


What did you expect to see?


Decode success


What did you see instead?


Errror  bmp: unsupported BMP image
@seankhliao seankhliao changed the title affected/package: golang.org/x/image/bmp: unsupported BMP image x/image/bmp: unsupported BMP image Jan 25, 2023
@gopherbot gopherbot added this to the Unreleased milestone Jan 25, 2023
@seankhliao
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the image link is an expired link

@seankhliao seankhliao added the WaitingForInfo Issue is not actionable because of missing required information, which needs to be provided. label Jan 25, 2023
@susanhuhu
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How shall I share the image pls? this basically the 1st image displayed if you search 'bmp image example' in Google

@seankhliao
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upload it here?

@susanhuhu
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susanhuhu commented Jan 25, 2023 •
edited

Github doesn't support it. It complains
image

@susanhuhu
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Ok, here we go, I put it into a zip file BMPExample.zip

@AlexanderYastrebov
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AlexanderYastrebov commented Jan 27, 2023 •
edited

The library only supports 8, 24 or 32 bits per pixel https://pkg.go.dev/golang.org/x/image/bmp#DecodeConfig
but the image has 4 bpp

file /tmp/go58005.bmp 
/tmp/go58005.bmp: PC bitmap, Windows 3.x format, 640 x 480 x 4

so it fails here https://github.com/golang/image/blob/bb712eb67b2b77b691f7b4335cc013a0eb42b71c/bmp/reader.go#L240

@susanhuhu
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Thanks for finding the root cause. Can we add support for 4bpp? sounds like an easy fix?

@susanhuhu
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Or, do you know any golang image library that can support 4bpp?

@AlexanderYastrebov
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See also related discussion #29711

@seankhliao seankhliao added NeedsInvestigation Someone must examine and confirm this is a valid issue and not a duplicate of an existing one. FeatureRequest and removed WaitingForInfo Issue is not actionable because of missing required information, which needs to be provided. labels Jan 30, 2023
@seankhliao seankhliao changed the title x/image/bmp: unsupported BMP image x/image/bmp: support 4-bit format Jan 30, 2023
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@AlexanderYastrebov @gopherbot @seankhliao @susanhuhu