NewImageFromBuffer Not Understand Image Format

[phlqp]

Hi there,

import "bytes"
import "image"
import "image/color"
import "image/png"
import "image/draw"

im := image.NewRGBA(image.Rect(0, 0, 100, 100))
draw.Draw(im, im.Bounds(), image.NewUniform(color.NRGBA{255, 0, 0, 255}), image.ZP, draw.Src)
var buff bytes.Buffer
err := png.Encode(&buff, im)

vipsImage, err := vips.NewImageFromBuffer(buff.Bytes())

[govips.info] failed to understand image format size=26149

Any suggestions how to solve this?

[tonimelisma]

What if you save the contents of buff into a .png image on your hard drive. Is it a valid png file, can you open it?

[phlqp]

I want to create many images in memory, resize and composite them before save to disk

[tonimelisma]

Sure. I'm just wondering, to debug your code, if it made sense to take it a step at a time. Have you checked that your code is capable of producing valid .png files which you can open?

[phlqp]

import "bufio"
import "os"
import "bytes"
import "image"
import "image/color"
import "image/png"
import "image/draw"

im := image.NewRGBA(image.Rect(0, 0, 100, 100))
draw.Draw(im, im.Bounds(), image.NewUniform(color.NRGBA{255, 0, 0, 255}), image.ZP, draw.Src)
var buff bytes.Buffer
err := png.Encode(&buff, im)

fo, err := os.Create("img.png")
defer fo.Close()
fw := bufio.NewWriter(fo)
fw.Write(buff.Bytes())
fw.Flush()

vipsImage, err := vips.NewImageFromBuffer(buff.Bytes())

Yes, It is valid png file

[Elad-Laufer]

The error '[govips.info] failed to understand image format size=26149' stats that the data size is 26149 bytes, while the file is 292 bytes.

Maybe the buffer was changed before buff.Bytes() was called?

[phlqp]

imageType is 3, but IsTypeSupported is false

[phlqp]

Change govips.go file:
initTypes {
...
if supportedImageTypes[k] {
govipsLog("govips", LogLevelInfo, fmt.Sprintf("registered image type loader type=%s", v))
}
...
}

[tonimelisma]

Thank you @dadaocongsanvietnam for the bug report. I've fixed this in the latest.