RGBLuminanceSource not working -> Readme Example is not working

[nemocrk]

Describe the bug RGBLuminanceSource.getRow() doesn't work. i'm trying to decode an image on a service worker, so without document. i'm getting data from the canvas for test purpose and passing it to the example as explained in the readme file.

the problem is that RBGLuminanceSource saves the buffer as RGB (3 bytes for pixel) in an uint8clampedarray, but when it serves them through getRow it responds with only 640 bytes without making any kind of transformation. i think that the correct behaviour is to respond with a grayscale row like in the toGrayscaleBuffer method of HTMLCanvasElementLuminanceSource

btw a temorary workaround could be to instantiate like this: ZXing.RGBLuminanceSource(toGrayscaleBuffer(data.data,data.width,data.height), data.width, data.height) function toGrayscaleBuffer(imageBuffer, width, height) { const grayscaleBuffer = new Uint8ClampedArray(width * height); for (let i = 0, j = 0, length = imageBuffer.length; i < length; i += 4, j++) { let gray; const alpha = imageBuffer[i + 3]; if (alpha === 0) { gray = 0xFF; } else { const pixelR = imageBuffer[i]; const pixelG = imageBuffer[i + 1]; const pixelB = imageBuffer[i + 2]; gray = (306 * pixelR + 601 * pixelG + 117 * pixelB + 0x200) >> 10; } grayscaleBuffer[j] = gray; } return grayscaleBuffer; }

To Reproduce See Attached file index - Copia.txt

[SvyatoslavPozhydaev]

you can do ZXing.RGBLuminanceSource(new Int32Array(data.data.buffer), data.width, data.height) if data is ImageData

[github-actions[bot]]

Stale issue message