LibPDF: Split ColorSpace into a different class for each color space

While unnecessary at the moment, this will allow for more fine-grained
control when complex color spaces get added.

Userland/Libraries/LibPDF/ColorSpace.h

@@ -0,0 +1,72 @@
+/*
+ * Copyright (c) 2021, Matthew Olsson <mattco@serenityos.org>
+ *
+ * SPDX-License-Identifier: BSD-2-Clause
+ */
+
+#pragma once
+
+#include <AK/FlyString.h>
+#include <LibGfx/Color.h>
+#include <LibPDF/Object.h>
+#include <LibPDF/Value.h>
+
+#define ENUMERATE_COLOR_SPACES(V) \
+    V(DeviceGray)                 \
+    V(DeviceRGB)                  \
+    V(DeviceCMYK)                 \
+    V(CalGray)                    \
+    V(CalRGB)                     \
+    V(Lab)                        \
+    V(ICCBased)                   \
+    V(Indexed)                    \
+    V(Pattern)                    \
+    V(Separation)                 \
+    V(DeviceN)
+
+namespace PDF {
+
+class ColorSpace : public RefCounted<ColorSpace> {
+public:
+    virtual ~ColorSpace() = default;
+
+    virtual Color color(const Vector<Value>& arguments) const = 0;
+};
+
+class DeviceGrayColorSpace final : public ColorSpace {
+public:
+    static RefPtr<DeviceGrayColorSpace> the();
+
+    virtual ~DeviceGrayColorSpace() override = default;
+
+    virtual Color color(const Vector<Value>& arguments) const override;
+
+private:
+    DeviceGrayColorSpace() = default;
+};
+
+class DeviceRGBColorSpace final : public ColorSpace {
+public:
+    static RefPtr<DeviceRGBColorSpace> the();
+
+    virtual ~DeviceRGBColorSpace() override = default;
+
+    virtual Color color(const Vector<Value>& arguments) const override;
+
+private:
+    DeviceRGBColorSpace() = default;
+};
+
+class DeviceCMYKColorSpace final : public ColorSpace {
+public:
+    static RefPtr<DeviceCMYKColorSpace> the();
+
+    virtual ~DeviceCMYKColorSpace() override = default;
+
+    virtual Color color(const Vector<Value>& arguments) const override;
+
+private:
+    DeviceCMYKColorSpace() = default;
+};
+
+}