feature request support BMP format as pointed in above #3509 (comment)

[tx0c]

Feature request

What are you trying to achieve?

but it's same BMP format as pointed in above #3509 (comment)

so can I file a feature request for Windows BMP files? if the browser can show it no problem, why cannot sharp process it?

Originally posted by @tx0c in #3509 (comment)

const res = await fetch(https://raw.githubusercontent.com/Jeff-Tian/gatsby-js/26158879194071fb652efb0f9659edd6ab553d70/packages/gatsby-plugin-sharp/src/__tests__/images/metadata-error.png);
const image = sharp(await res.arrayBuffer(), { animated: false, failOn: "none" });
const metadata = await image.metadata();

// then outer try catch got ERROR: [Error: Input buffer contains unsupported image format]
and it seems also PC bitmap format:

$ wget 'https://raw.githubusercontent.com/Jeff-Tian/gatsby-js/26158879194071fb652efb0f9659edd6ab553d70/packages/gatsby-plugin-sharp/src/__tests__/images/metadata-error.png'
$ file ./tmp/c16b9dbe-9d9f-4893-9b8b-f22f2656b479.png
./tmp/c16b9dbe-9d9f-4893-9b8b-f22f2656b479.png: PC bitmap, Windows 3.x format, 1280 x 720 x 24, resolution 3780 x 3780 px/m, cbSize 2764854, bits offset 54

Please provide sample image(s) that help explain this feature

Hi, this looks like a Windows bitmap (BMP) file.

$ curl -s https://raw.githubusercontent.com/Jeff-Tian/gatsby-js/26158879194071fb652efb0f9659edd6ab553d70/packages/gatsby-plugin-sharp/src/__tests__/images/metadata-error.png | file -
/dev/stdin: PC bitmap, Windows 98/2000 and newer format, 1710 x 624 x 32, cbSize 4268298, bits offset 138

Originally posted by @lovell in #3509 (comment)

and https://camo.githubusercontent.com/fd352155596f7d714ee12230f59da7323b626c729ca94c5d4b934e379bf52fe0/68747470733a2f2f6173736574732e6d6174746572732e6e6577732f656d6265642f63313662396462652d396439662d343839332d396238622d6632326632363536623437392e706e67

[tx0c]

in browser showing no problem, and the convert from ImageMagick can process it, why not sharp ?

[lovell]

Please see #543 #806 #3035 for possible methods of decoding BMP images.

[tx0c]

it's not complete, but if such a method like #3035 (comment) exists, why can't merge this logic as a helper into sharp?

make the sharp npm module as smooth as possible, support as many formats as possible

[lovell]

Supporting as many formats as possible is not an aim of sharp, so it may be the wrong tool to solve your problem.