--- /dev/null
+/* === S Y N F I G ========================================================= */
+/*! \file gamma.cpp
+** \brief Template File
+**
+** $Id$
+**
+** \legal
+** Copyright (c) 2002-2005 Robert B. Quattlebaum Jr., Adrian Bentley
+**
+** This package is free software; you can redistribute it and/or
+** modify it under the terms of the GNU General Public License as
+** published by the Free Software Foundation; either version 2 of
+** the License, or (at your option) any later version.
+**
+** This package is distributed in the hope that it will be useful,
+** but WITHOUT ANY WARRANTY; without even the implied warranty of
+** MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+** General Public License for more details.
+** \endlegal
+*/
+/* ========================================================================= */
+
+/* === H E A D E R S ======================================================= */
+
+#ifdef USING_PCH
+# include "pch.h"
+#else
+#ifdef HAVE_CONFIG_H
+# include <config.h>
+#endif
+
+#include "gamma.h"
+#include <cmath>
+#include <algorithm>
+#endif
+
+/* === U S I N G =========================================================== */
+
+using namespace std;
+//using namespace etl;
+using namespace synfig;
+
+/* === M A C R O S ========================================================= */
+
+/* === G L O B A L S ======================================================= */
+
+/* === P R O C E D U R E S ================================================= */
+
+/* === M E T H O D S ======================================================= */
+
+void
+Gamma::set_gamma(float x)
+{
+ gamma_r=gamma_g=gamma_b=x;
+ int i;
+ red_blue_level=1.0f;
+ for(i=0;i<65536;i++)
+ {
+ float f(float(i)/65536.0f);
+ f=pow(f,gamma_r);
+ table_r_U16_to_U8[i]=table_g_U16_to_U8[i]=table_b_U16_to_U8[i]=(unsigned char)(f*(255.0f-(black_level*255))+0.5f + black_level*255.0f);
+ }
+
+ for(i=0;i<256;i++)
+ table_r_U8_to_F32[i]=table_g_U8_to_F32[i]=table_b_U8_to_F32[i]=pow((float(i)/255.0f)*(1.0f-black_level)+black_level,gamma_r);
+}
+
+
+void
+Gamma::refresh_gamma_r()
+{
+ int i;
+// const float scalar(min(red_blue_level,1.0f));
+ const float scalar(1.0f);
+ for(i=0;i<65536;i++)
+ {
+ float f(float(i)/65536.0f);
+ f=pow(f,gamma_r)*scalar;
+ table_r_U16_to_U8[i]=(unsigned char)(f*(255.0f-(black_level*255))+0.5f + black_level*255.0f);
+ }
+
+ for(i=0;i<256;i++)
+ table_r_U8_to_F32[i]=pow((float(i)/255.0f)*(1.0f-black_level)+black_level,gamma_r)*scalar;
+}
+
+void
+Gamma::refresh_gamma_g()
+{
+ int i;
+// const float scalar(sqrt(min(red_blue_level,2.0f-red_blue_level)));
+ const float scalar(1.0f);
+ for(i=0;i<65536;i++)
+ {
+ float f(float(i)/65536.0f);
+ f=pow(f,gamma_g)*scalar;
+ table_g_U16_to_U8[i]=(unsigned char)(f*(255.0f-(black_level*255))+0.5f + black_level*255.0f);
+ }
+ for(i=0;i<256;i++)
+ table_g_U8_to_F32[i]=pow((float(i)/255.0f)*(1.0f-black_level)+black_level,gamma_g)*scalar;
+}
+
+void
+Gamma::refresh_gamma_b()
+{
+ int i;
+// const float scalar(min(2.0f-red_blue_level,1.0f));
+ const float scalar(1.0f);
+ for(i=0;i<65536;i++)
+ {
+ float f(float(i)/65536.0f);
+ f=pow(f,gamma_b)*scalar;
+ table_b_U16_to_U8[i]=(unsigned char)(f*(255.0f-(black_level*255))+0.5f + black_level*255.0f);
+ }
+ for(i=0;i<256;i++)
+ table_b_U8_to_F32[i]=pow((float(i)/255.0f)*(1.0f-black_level)+black_level,gamma_b)*scalar;
+}
+
+void
+Gamma::set_gamma_r(float x)
+{
+ // If the gamma hasn't changed, then don't recompute the tables
+ if(x==gamma_r) return;
+
+ gamma_r=x;
+ refresh_gamma_r();
+}
+
+void
+Gamma::set_gamma_g(float x)
+{
+ // If the gamma hasn't changed, then don't recompute the tables
+ if(x==gamma_g) return;
+
+ gamma_g=x;
+ refresh_gamma_g();
+}
+
+void
+Gamma::set_gamma_b(float x)
+{
+ // If the gamma hasn't changed, then don't recompute the tables
+ if(x==gamma_b) return;
+
+ gamma_b=x;
+ refresh_gamma_b();
+}
+
+void
+Gamma::set_black_level(float x)
+{
+ // If the black_level hasn't changed, then don't recompute the tables
+ if(x==black_level) return;
+
+ black_level=x;
+
+ // Rebuild tables
+ refresh_gamma_r();
+ refresh_gamma_g();
+ refresh_gamma_b();
+}
+
+void
+Gamma::set_red_blue_level(float x)
+{
+ // If the black_level hasn't changed, then don't recompute the tables
+ if(x==red_blue_level) return;
+
+ red_blue_level=x;
+
+ // Rebuild tables
+ refresh_gamma_r();
+ refresh_gamma_g();
+ refresh_gamma_b();
+}
+
+void
+Gamma::set_all(float r, float g, float b, float black, float red_blue)
+{
+ // If nothing has changed, then don't recompute the tables
+ if(gamma_r==r && gamma_g==g && gamma_b==b && black_level==black && red_blue_level==red_blue)
+ return;
+
+ gamma_r=r;
+ gamma_g=g;
+ gamma_b=b;
+ black_level=black;
+ red_blue_level=red_blue;
+
+ // Rebuild tables
+ refresh_gamma_r();
+ refresh_gamma_g();
+ refresh_gamma_b();
+}
projects / synfig.git / blobdiff