How to set bitmap with DataURL

Description

const setdpi = () => ({

    setdpi (dpi, callback) {

        if ( typeof dpi !== 'number' ) return throwError.call(this, '( dpi ) must be a number', callback);

        this.getBase64Async(this._originalMime).then( b64 => {
            const [ none, b64_dpi ] = changeDPI.changeDpiDataUrl(b64, dpi).split(',')
            const b64_buffer = Buffer.from( b64_dpi, 'base64' )
            this.bitmap.data = b64_buffer 
        })

        return this

    }

})

Contributor guide

Tech stack

javascriptnodejs

Domain

backend

Issue type

bug

DifficultyEstimated implementation difficulty for a new contributor, from 1 for very small changes to 5 for expert-level work.

3

Estimated timeA rough time range for an experienced contributor to investigate, implement, test, and prepare a pull request.

1-3 hours

Activity statusHow available the issue appears right now: fresh, active, stale, blocked, or waiting on maintainer input.

stale

ClarityHow clearly the issue explains the expected change, acceptance criteria, and next step.

needs investigation

Prerequisites

JavaScriptjimp libraryBufferbase64

Newbie friendlinessA 1-100 score estimating how approachable this issue is for first-time contributors.

30

Research direction

Investigate the `changeDPI` module and its `changeDpiDataUrl` function to understand the expected input/output. Examine the `getBase64Async` method to confirm its return value. Check how `bitmap.data` is assigned elsewhere in the codebase. Look for any existing documentation or issues related to converting data URLs to bitmap data. The provided code may require additional steps to decode the base64 string into a buffer usable by jimp.