colorSpaceConverters convertRGBColorByPlane.ts

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  import type { ByteArray } from 'dicom-parser';
 
export default function (
  imageFrame: ByteArray,
  colorBuffer: ByteArray,
  useRGBA: boolean
): void {
  if (imageFrame === undefined) {
    throw new Error('decodeRGB: rgbBuffer must be defined');
  }
  if (imageFrame.length % 3 !== 0) {
    throw new Error(
      `decodeRGB: rgbBuffer length ${imageFrame.length} must be divisible by 3`
    );
  }
 
  const numPixels = imageFrame.length / 3;
 
  let bufferIndex = 0;
 
  let rIndex = 0;
 
  let gIndex = numPixels;
 
  let bIndex = numPixels * 2;
 
  if (useRGBA) {
    for (let i = 0; i < numPixels; i++) {
      colorBuffer[bufferIndex++] = imageFrame[rIndex++]; // red
      colorBuffer[bufferIndex++] = imageFrame[gIndex++]; // green
      colorBuffer[bufferIndex++] = imageFrame[bIndex++]; // blue
      colorBuffer[bufferIndex++] = 255; // alpha
    }
  } else {
    for (let i = 0; i < numPixels; i++) {
      colorBuffer[bufferIndex++] = imageFrame[rIndex++]; // red
      colorBuffer[bufferIndex++] = imageFrame[gIndex++]; // green
      colorBuffer[bufferIndex++] = imageFrame[bIndex++]; // blue
    }
  }
}