Function fromTexture

tfjs-react-native/src/camera/camera.ts:145–228

(
    gl: WebGL2RenderingContext, texture: WebGLTexture, sourceDims: Dimensions,
    targetShape: Dimensions, useCustomShadersToResize = false,
    options: FromTextureOptions = {})

 * @doc {heading: 'Media', subheading: 'Camera'}
 */
export function fromTexture(
    gl: WebGL2RenderingContext, texture: WebGLTexture, sourceDims: Dimensions,
    targetShape: Dimensions, useCustomShadersToResize = false,
    options: FromTextureOptions = {}): tf.Tensor3D {
  tf.util.assert(
      targetShape.depth === 3 || targetShape.depth === 4,
      () => 'fromTexture Error: target depth must be 3 or 4');

  if (targetShape.depth === 3 && targetShape.width % 4 !== 0) {
    // We throw an error here rather than use the CPU workaround as the user is
    // likely trying to get the maximum performance.
    if (glCapabilities.canDownloadFromRGBTexture.get(gl)) {
      // See
      // https://www.khronos.org/opengl/wiki/Common_Mistakes#Texture_upload_and_pixel_reads
      // for more details. At the moment gl.pixelStorei(gl.PACK_ALIGNMENT, 1);
      // is not supported on expo. "EXGL: gl.pixelStorei() doesn't support this
      // parameter yet!"
      throw new Error(
          'When using targetShape.depth=3, targetShape.width must be' +
          ' a multiple of 4. Alternatively do not call detectGLCapabilities()');
    }
  }

  const originalTargetDepth = targetShape.depth;
  const targetDepth = glCapabilities.canDownloadFromRGBTexture.get(gl) ?
      originalTargetDepth :
      4;

  sourceDims = {
    height: Math.floor(sourceDims.height),
    width: Math.floor(sourceDims.width),
    depth: sourceDims.depth,
  };

  targetShape = {
    height: Math.floor(targetShape.height),
    width: Math.floor(targetShape.width),
    depth: targetDepth
  };

  const alignCorners =
      options.alignCorners != null ? options.alignCorners : false;
  const interpolation =
      options.interpolation != null ? options.interpolation : 'bilinear';
  const rotation = options.rotation != null ? options.rotation : 0;

  tf.util.assert(
      interpolation === 'bilinear' || interpolation === 'nearest_neighbor',
      () => 'fromTexture Error: interpolation must be one of' +
          ' "bilinear" or "nearest_neighbor"');

  tf.util.assert(
      [0, 90, 180, 270, 360, -90, -180, -270].includes(rotation),
      () => 'fromTexture Error: rotation must be ' +
          '0, +/- 90, +/- 180, +/- 270 or 360');

  const resizedTexture = runResizeProgram(
      gl, texture, sourceDims, targetShape, alignCorners,