WIP: Moved sources int src/, separated most of the source code from Perl.

The XS was left only for the unit / integration tests, and it links
libslic3r only. No wxWidgets are allowed to be used from Perl starting
from now.

src/agg/agg_gamma_lut.h

@@ -0,0 +1,300 @@
+//----------------------------------------------------------------------------
+// Anti-Grain Geometry - Version 2.4
+// Copyright (C) 2002-2005 Maxim Shemanarev (http://www.antigrain.com)
+//
+// Permission to copy, use, modify, sell and distribute this software 
+// is granted provided this copyright notice appears in all copies. 
+// This software is provided "as is" without express or implied
+// warranty, and with no claim as to its suitability for any purpose.
+//
+//----------------------------------------------------------------------------
+// Contact: mcseem@antigrain.com
+//          mcseemagg@yahoo.com
+//          http://www.antigrain.com
+//----------------------------------------------------------------------------
+
+#ifndef AGG_GAMMA_LUT_INCLUDED
+#define AGG_GAMMA_LUT_INCLUDED
+
+#include <math.h>
+#include "agg_basics.h"
+#include "agg_gamma_functions.h"
+
+namespace agg
+{
+    template<class LoResT=int8u, 
+             class HiResT=int8u, 
+             unsigned GammaShift=8, 
+             unsigned HiResShift=8> class gamma_lut
+    {
+    public:
+        typedef gamma_lut<LoResT, HiResT, GammaShift, HiResShift> self_type;
+
+        enum gamma_scale_e
+        {
+            gamma_shift = GammaShift,
+            gamma_size  = 1 << gamma_shift,
+            gamma_mask  = gamma_size - 1
+        };
+
+        enum hi_res_scale_e
+        {
+            hi_res_shift = HiResShift,
+            hi_res_size  = 1 << hi_res_shift,
+            hi_res_mask  = hi_res_size - 1
+        };
+
+        ~gamma_lut()
+        {
+            pod_allocator<LoResT>::deallocate(m_inv_gamma, hi_res_size);
+            pod_allocator<HiResT>::deallocate(m_dir_gamma, gamma_size);
+        }
+
+        gamma_lut() : 
+            m_gamma(1.0), 
+            m_dir_gamma(pod_allocator<HiResT>::allocate(gamma_size)),
+            m_inv_gamma(pod_allocator<LoResT>::allocate(hi_res_size))
+        {
+            unsigned i;
+            for(i = 0; i < gamma_size; i++)
+            {
+                m_dir_gamma[i] = HiResT(i << (hi_res_shift - gamma_shift));
+            }
+
+            for(i = 0; i < hi_res_size; i++)
+            {
+                m_inv_gamma[i] = LoResT(i >> (hi_res_shift - gamma_shift));
+            }
+        }
+
+        gamma_lut(double g) :
+            m_gamma(1.0), 
+            m_dir_gamma(pod_allocator<HiResT>::allocate(gamma_size)),
+            m_inv_gamma(pod_allocator<LoResT>::allocate(hi_res_size))
+        {
+            gamma(g);
+        }
+
+        void gamma(double g) 
+        {
+            m_gamma = g;
+
+            unsigned i;
+            for(i = 0; i < gamma_size; i++)
+            {
+                m_dir_gamma[i] = (HiResT)
+                    uround(pow(i / double(gamma_mask), m_gamma) * double(hi_res_mask));
+            }
+
+            double inv_g = 1.0 / g;
+            for(i = 0; i < hi_res_size; i++)
+            {
+                m_inv_gamma[i] = (LoResT)
+                    uround(pow(i / double(hi_res_mask), inv_g) * double(gamma_mask));
+            }
+        }
+
+        double gamma() const
+        {
+            return m_gamma;
+        }
+
+        HiResT dir(LoResT v) const 
+        { 
+            return m_dir_gamma[unsigned(v)]; 
+        }
+
+        LoResT inv(HiResT v) const 
+        { 
+            return m_inv_gamma[unsigned(v)];
+        }
+
+    private:
+        gamma_lut(const self_type&);
+        const self_type& operator = (const self_type&);
+
+        double m_gamma;
+        HiResT* m_dir_gamma;
+        LoResT* m_inv_gamma;
+    };
+
+    //
+    // sRGB support classes
+    //
+
+    // sRGB_lut - implements sRGB conversion for the various types.
+    // Base template is undefined, specializations are provided below.
+    template<class LinearType>
+    class sRGB_lut;
+
+    template<>
+    class sRGB_lut<float>
+    {
+    public:
+		sRGB_lut()
+		{
+			// Generate lookup tables.
+			for (int i = 0; i <= 255; ++i)
+			{
+				m_dir_table[i] = float(sRGB_to_linear(i / 255.0));
+			}
+			for (int i = 0; i <= 65535; ++i)
+			{
+				m_inv_table[i] = uround(255.0 * linear_to_sRGB(i / 65535.0));
+			}
+		}
+
+		float dir(int8u v) const
+		{
+			return m_dir_table[v];
+		}
+
+		int8u inv(float v) const
+		{
+			return m_inv_table[int16u(0.5 + v * 65535)];
+		}
+
+	private:
+		float m_dir_table[256];
+		int8u m_inv_table[65536];
+    };
+
+    template<>
+    class sRGB_lut<int16u>
+    {
+    public:
+        sRGB_lut()
+        {
+            // Generate lookup tables.
+            for (int i = 0; i <= 255; ++i)
+            {
+                m_dir_table[i] = uround(65535.0 * sRGB_to_linear(i / 255.0));
+            }
+			for (int i = 0; i <= 65535; ++i)
+			{
+				m_inv_table[i] = uround(255.0 * linear_to_sRGB(i / 65535.0));
+			}
+		}
+
+		int16u dir(int8u v) const
+		{
+			return m_dir_table[v];
+		}
+
+		int8u inv(int16u v) const
+		{
+			return m_inv_table[v];
+		}
+
+	private:
+		int16u m_dir_table[256];
+		int8u m_inv_table[65536];
+	};
+
+    template<>
+    class sRGB_lut<int8u>
+    {
+    public:
+        sRGB_lut()
+        {
+            // Generate lookup tables. 
+            for (int i = 0; i <= 255; ++i)
+            {
+                m_dir_table[i] = uround(255.0 * sRGB_to_linear(i / 255.0));
+                m_inv_table[i] = uround(255.0 * linear_to_sRGB(i / 255.0));
+            }
+        }
+
+		int8u dir(int8u v) const
+		{
+			return m_dir_table[v];
+		}
+
+		int8u inv(int8u v) const
+        {
+            return m_inv_table[v];
+        }
+
+	private:
+		int8u m_dir_table[256];
+		int8u m_inv_table[256];
+	};
+
+    // Common base class for sRGB_conv objects. Defines an internal 
+    // sRGB_lut object so that users don't have to.
+    template<class T>
+    class sRGB_conv_base
+    {
+    public:
+        static T rgb_from_sRGB(int8u x)
+        {
+            return lut.dir(x);
+        }
+
+        static int8u rgb_to_sRGB(T x)
+        {
+            return lut.inv(x);
+        }
+
+    private:
+        static sRGB_lut<T> lut;
+    };
+
+    // Definition of sRGB_conv_base::lut. Due to the fact that this a template, 
+    // we don't need to place the definition in a cpp file. Hurrah.
+    template<class T>
+    sRGB_lut<T> sRGB_conv_base<T>::lut;
+
+    // Wrapper for sRGB-linear conversion. 
+    // Base template is undefined, specializations are provided below.
+    template<class T>
+    class sRGB_conv;
+
+    template<>
+    class sRGB_conv<float> : public sRGB_conv_base<float>
+    {
+    public:
+        static float alpha_from_sRGB(int8u x)
+        {
+			static const double y = 1 / 255.0;
+            return float(x * y);
+        }
+
+        static int8u alpha_to_sRGB(float x)
+        {
+            return int8u(0.5 + x * 255);
+        }
+    };
+
+    template<>
+    class sRGB_conv<int16u> : public sRGB_conv_base<int16u>
+    {
+    public:
+        static int16u alpha_from_sRGB(int8u x)
+        {
+            return (x << 8) | x;
+        }
+
+        static int8u alpha_to_sRGB(int16u x)
+        {
+            return x >> 8;
+        }
+    };
+
+    template<>
+    class sRGB_conv<int8u> : public sRGB_conv_base<int8u>
+    {
+    public:
+        static int8u alpha_from_sRGB(int8u x)
+        {
+            return x;
+        }
+
+        static int8u alpha_to_sRGB(int8u x)
+        {
+            return x;
+        }
+    };
+}
+
+#endif