Raster source for composing pixels from other sources

src/ol/raster/operation.js

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+goog.provide('ol.raster.IdentityOp');
+goog.provide('ol.raster.Operation');
+
+
+/**
+ * A function that takes an array of {@link ol.raster.Pixel} as inputs, performs
+ * some operation on them, and returns an array of {@link ol.raster.Pixel} as
+ * outputs.
+ *
+ * @typedef {function(Array.<ol.raster.Pixel>): Array.<ol.raster.Pixel>}
+ * @api
+ */
+ol.raster.Operation;
+
+
+/**
+ * The identity operation for pixels.  Returns the supplied input pixels as
+ * outputs.
+ * @param {Array.<ol.raster.Pixel>} inputs Input pixels.
+ * @return {Array.<ol.raster.Pixel>} The input pixels as output.
+ */
+ol.raster.IdentityOp = function(inputs) {
+  return inputs;
+};

src/ol/raster/pixel.js

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+goog.provide('ol.raster.Pixel');
+
+
+/**
+ * An array of numbers representing pixel values.
+ * @typedef {Array.<number>} ol.raster.Pixel
+ * @api
+ */
+ol.raster.Pixel;