Factor out color matrix generation, move color matrix into layer renderer

src/ol/vec/mat4.js

@@ -0,0 +1,92 @@
+goog.provide('ol.vec.Mat4');
+
+goog.require('goog.vec.Mat4');
+
+
+/**
+ * @param {!goog.vec.Mat4.Float32} matrix Matrix.
+ * @param {number} value Brightness value.
+ * @return {!goog.vec.Mat4.Float32} Matrix.
+ */
+ol.vec.Mat4.makeBrightness = function(matrix, value) {
+  goog.vec.Mat4.makeTranslate(matrix, value, value, value);
+  return matrix;
+};
+
+
+/**
+ * @param {!goog.vec.Mat4.Float32} matrix Matrix.
+ * @param {number} value Contrast value.
+ * @return {!goog.vec.Mat4.Float32} Matrix.
+ */
+ol.vec.Mat4.makeContrast = function(matrix, value) {
+  goog.vec.Mat4.makeScale(matrix, value, value, value);
+  var translateValue = (-0.5 * value + 0.5);
+  goog.vec.Mat4.setColumnValues(matrix, 3,
+      translateValue, translateValue, translateValue, 1);
+  return matrix;
+};
+
+
+/**
+ * @param {!goog.vec.Mat4.Float32} matrix Matrix.
+ * @param {number} value Hue value.
+ * @return {!goog.vec.Mat4.Float32} Matrix.
+ */
+ol.vec.Mat4.makeHue = function(matrix, value) {
+  var cosHue = Math.cos(value);
+  var sinHue = Math.sin(value);
+  var v00 = 0.213 + cosHue * 0.787 - sinHue * 0.213;
+  var v01 = 0.715 - cosHue * 0.715 - sinHue * 0.715;
+  var v02 = 0.072 - cosHue * 0.072 + sinHue * 0.928;
+  var v03 = 0;
+  var v10 = 0.213 - cosHue * 0.213 + sinHue * 0.143;
+  var v11 = 0.715 + cosHue * 0.285 + sinHue * 0.140;
+  var v12 = 0.072 - cosHue * 0.072 - sinHue * 0.283;
+  var v13 = 0;
+  var v20 = 0.213 - cosHue * 0.213 - sinHue * 0.787;
+  var v21 = 0.715 - cosHue * 0.715 + sinHue * 0.715;
+  var v22 = 0.072 + cosHue * 0.928 + sinHue * 0.072;
+  var v23 = 0;
+  var v30 = 0;
+  var v31 = 0;
+  var v32 = 0;
+  var v33 = 1;
+  goog.vec.Mat4.setFromValues(matrix,
+      v00, v10, v20, v30,
+      v01, v11, v21, v31,
+      v02, v12, v22, v32,
+      v03, v13, v23, v33);
+  return matrix;
+};
+
+
+/**
+ * @param {!goog.vec.Mat4.Float32} matrix Matrix.
+ * @param {number} value Saturation value.
+ * @return {!goog.vec.Mat4.Float32} Matrix.
+ */
+ol.vec.Mat4.makeSaturation = function(matrix, value) {
+  var v00 = 0.213 + 0.787 * value;
+  var v01 = 0.715 - 0.715 * value;
+  var v02 = 0.072 - 0.072 * value;
+  var v03 = 0;
+  var v10 = 0.213 - 0.213 * value;
+  var v11 = 0.715 + 0.285 * value;
+  var v12 = 0.072 - 0.072 * value;
+  var v13 = 0;
+  var v20 = 0.213 - 0.213 * value;
+  var v21 = 0.715 - 0.715 * value;
+  var v22 = 0.072 + 0.928 * value;
+  var v23 = 0;
+  var v30 = 0;
+  var v31 = 0;
+  var v32 = 0;
+  var v33 = 1;
+  goog.vec.Mat4.setFromValues(matrix,
+      v00, v10, v20, v30,
+      v01, v11, v21, v31,
+      v02, v12, v22, v32,
+      v03, v13, v23, v33);
+  return matrix;
+};