14.25: Camera Raw's Light and Color sliders match Photoshop's

src/Document/CameraRawTables.h

@@ -0,0 +1,31 @@
+#pragma once
+
+#include "Document/CameraRaw.h"
+extern "C" {
+#include "AdjustPixels.h"
+}
+
+#include <optional>
+#include <vector>
+
+// Photoshop's Light and Color sliders, measured as 17³ colour tables.
+namespace CameraRawTables {
+constexpr int size = 17;
+// The grid the stages compose onto, finer than the tables.
+constexpr int grid = 33;
+
+// Every table, red slowest, 3 bytes a colour; loaded once.
+const std::vector<uint8_t> &tables();
+// Temperature and Tint: the four grid tables around them.
+CameraRawStage whiteBalance(double temperature, double tint);
+struct Stages {
+    std::vector<CameraRawStage> before;
+    std::vector<CameraRawStage> after;
+};
+// Before Highlights and Shadows, and after; zero sliders left out.
+Stages stages(const CameraRawSettings &settings);
+// The stages over the composing grid; empty without stages.
+std::vector<float> compose(const std::vector<CameraRawStage> &stages);
+// Temperature and Tint turning a straight sRGB colour gray.
+std::optional<CameraRawSettings::Balance> neutralize(double red, double green, double blue);
+}