all: gamma correction patch by Arwed von Merkatz <v.merkatz@gmx.net>

modules/gui/wxwindows/interface.cpp

@@ -2,7 +2,7 @@
  * interface.cpp : wxWindows plugin for vlc
  *****************************************************************************
  * Copyright (C) 2000-2001, 2003 VideoLAN
- * $Id: interface.cpp,v 1.83 2004/01/05 13:00:39 zorglub Exp $
+ * $Id: interface.cpp,v 1.84 2004/01/22 15:00:10 sigmunau Exp $
  *
  * Authors: Gildas Bazin <gbazin@netcourrier.com>
  *
@@ -145,6 +145,7 @@ enum
     Contrast_Event,
     Brightness_Event,
     Saturation_Event,
+    Gamma_Event,
 
     Ratio_Event,
     Visual_Event,
@@ -200,6 +201,7 @@ BEGIN_EVENT_TABLE(Interface, wxFrame)
     EVT_COMMAND_SCROLL(Contrast_Event, Interface::OnContrastUpdate)
     EVT_COMMAND_SCROLL(Brightness_Event, Interface::OnBrightnessUpdate)
     EVT_COMMAND_SCROLL(Saturation_Event, Interface::OnSaturationUpdate)
+    EVT_COMMAND_SCROLL(Gamma_Event, Interface::OnGammaUpdate)
 
 END_EVENT_TABLE()
 
@@ -546,11 +548,21 @@ void Interface::CreateOurExtraPanel()
     saturation_sizer->Add(saturation_slider,1,0,0);
     saturation_sizer->Layout();
 
+    wxBoxSizer *gamma_sizer = new wxBoxSizer( wxHORIZONTAL );
+    wxStaticText *gamma_text = new wxStaticText( extra_frame, -1,
+                                          wxU(_("Gamma")) );
+    gamma_slider = new wxSlider ( extra_frame, Gamma_Event, 0, 0,
+                           100, wxDefaultPosition, wxDefaultSize );
+    gamma_sizer->Add(gamma_text,1,0,0);
+    gamma_sizer->Add(gamma_slider,1,0,0);
+    gamma_sizer->Layout();
+
     adjust_sizer->Add(adjust_check, 1, wxEXPAND, 0);
     adjust_sizer->Add(hue_sizer, 1, wxEXPAND, 0);
     adjust_sizer->Add(contrast_sizer, 1, wxEXPAND, 0);
     adjust_sizer->Add(brightness_sizer, 1, wxEXPAND, 0);
     adjust_sizer->Add(saturation_sizer, 1, wxEXPAND, 0);
+    adjust_sizer->Add(gamma_sizer, 1, wxEXPAND, 0);
 
     extra_sizer->Add(adjust_sizer,1,wxBOTTOM,5);
 
@@ -637,6 +649,7 @@ void Interface::CreateOurExtraPanel()
         contrast_slider->Enable();
         brightness_slider->Enable();
         hue_slider->Enable();
+        gamma_slider->Enable();
     }
     else
     {
@@ -645,6 +658,7 @@ void Interface::CreateOurExtraPanel()
         contrast_slider->Disable();
         brightness_slider->Disable();
         hue_slider->Disable();
+        gamma_slider->Disable();
     }
     if( psz_filters ) free( psz_filters );
 
@@ -662,6 +676,9 @@ void Interface::CreateOurExtraPanel()
     f_value = config_GetFloat( p_intf, "brightness" );
     if( f_value > 0 && f_value < 2 )
         brightness_slider->SetValue( (int)(100 * f_value) );
+    f_value = config_GetFloat( p_intf, "gamma" );
+    if (f_value > 0 && f_value < 10 )
+        gamma_slider->SetValue( (int)(10 * f_value) );
 
     extra_frame->Hide();
 }
@@ -983,6 +1000,7 @@ void Interface::OnEnableAdjust(wxCommandEvent& event)
         saturation_slider->Enable();
         contrast_slider->Enable();
         hue_slider->Enable();
+        gamma_slider->Enable();
     }
     else
     {
@@ -1025,6 +1043,7 @@ void Interface::OnEnableAdjust(wxCommandEvent& event)
         saturation_slider->Disable();
         contrast_slider->Disable();
         hue_slider->Disable();
+        gamma_slider->Disable();
     }
     if(psz_filters) free(psz_filters);
     if(psz_new) free(psz_new);
@@ -1051,6 +1070,11 @@ void Interface::OnContrastUpdate(wxScrollEvent& event)
 
 }
 
+void Interface::OnGammaUpdate(wxScrollEvent& event)
+{
+    config_PutFloat( p_intf , "gamma" , (float)event.GetPosition()/10 );
+}
+
 void Interface::OnRatio( wxCommandEvent& event )
 {
    config_PutPsz( p_intf, "aspect-ratio", ratio_combo->GetValue().mb_str() );

modules/gui/wxwindows/wxwindows.h

@@ -2,7 +2,7 @@
  * wxwindows.h: private wxWindows interface description
  *****************************************************************************
  * Copyright (C) 1999, 2000 VideoLAN
- * $Id: wxwindows.h,v 1.85 2004/01/15 21:49:07 sigmunau Exp $
+ * $Id: wxwindows.h,v 1.86 2004/01/22 15:00:10 sigmunau Exp $
  *
  * Authors: Gildas Bazin <gbazin@netcourrier.com>
  *
@@ -178,6 +178,7 @@ public:
     wxSlider *contrast_slider;
     wxSlider *saturation_slider;
     wxSlider *hue_slider;
+    wxSlider *gamma_slider;
 
     wxStaticBox *other_box;
     wxComboBox *ratio_combo;
@@ -218,6 +219,7 @@ private:
     void OnContrastUpdate( wxScrollEvent& event );
     void OnBrightnessUpdate( wxScrollEvent& event );
     void OnSaturationUpdate( wxScrollEvent& event );
+    void OnGammaUpdate( wxScrollEvent& event );
 
     void OnRatio( wxCommandEvent& event );
     void OnEnableVisual( wxCommandEvent& event );

modules/video_filter/adjust.c

@@ -2,7 +2,7 @@
  * adjust.c : Contrast/Hue/Saturation/Brightness video plugin for vlc
  *****************************************************************************
  * Copyright (C) 2000, 2001, 2002, 2003 VideoLAN
- * $Id: adjust.c,v 1.14 2003/10/15 22:49:48 gbazin Exp $
+ * $Id: adjust.c,v 1.15 2004/01/22 15:00:10 sigmunau Exp $
  *
  * Authors: Simon Latapie <garf@via.ecp.fr>
  *
@@ -65,6 +65,8 @@ static int  SendEvents( vlc_object_t *, char const *,
 #define SAT_LONGTEXT N_("Set the image saturation, between 0 and 3. Defaults to 1")
 #define LUM_TEXT N_("Set image brightness")
 #define LUM_LONGTEXT N_("Set the image brightness, between 0 and 2. Defaults to 1")
+#define GAMMA_TEXT N_("Set image gamma")
+#define GAMMA_LONGTEXT N_("Set the image gamma, between 0.01 and 10. Defaults to 1")
 
 
 vlc_module_begin();
@@ -73,7 +75,8 @@ vlc_module_begin();
     add_float_with_range( "brightness", 1.0, 0.0, 2.0, NULL, LUM_TEXT, LUM_LONGTEXT, VLC_FALSE );
     add_integer_with_range( "hue", 0, 0, 360, NULL, HUE_TEXT, HUE_LONGTEXT, VLC_FALSE );
     add_float_with_range( "saturation", 1.0, 0.0, 3.0, NULL, SAT_TEXT, SAT_LONGTEXT, VLC_FALSE );
-    set_description( _("contrast/hue/saturation/brightness filter") );
+    add_float_with_range( "gamma", 1.0, 0.01, 10.0, NULL, GAMMA_TEXT, GAMMA_LONGTEXT, VLC_FALSE );
+    set_description( _("contrast/hue/saturation/brightness/gamma filter") );
     set_capability( "video filter", 0 );
     add_shortcut( "adjust" );
     set_callbacks( Create, Destroy );
@@ -204,12 +207,14 @@ static void Destroy( vlc_object_t *p_this )
 static void Render( vout_thread_t *p_vout, picture_t *p_pic )
 {
     int pi_luma[256];
+    int pi_gamma[256];
 
     picture_t *p_outpic;
     uint8_t *p_in, *p_in_v, *p_in_end, *p_line_end;
     uint8_t *p_out, *p_out_v;
 
     double  f_hue;
+    double  f_gamma;
     int32_t i_cont, i_lum;
     int i_sat, i_sin, i_cos, i_x, i_y;
     int i;
@@ -233,15 +238,22 @@ static void Render( vout_thread_t *p_vout, picture_t *p_pic )
     i_lum = (config_GetFloat( p_vout, "brightness" ) - 1.0) * 255;
     f_hue = config_GetInt( p_vout, "hue" ) * M_PI / 180;
     i_sat = config_GetFloat( p_vout, "saturation" ) * 256;
+    f_gamma = 1.0 / config_GetFloat( p_vout, "gamma" );
 
     /* Contrast is a fast but kludged function, so I put this gap to be
      * cleaner :) */
     i_lum += 128 - i_cont / 2;
 
+    /* Fill the gamma lookup table */
+    for( i = 0 ; i < 256 ; i++ )
+    {
+      pi_gamma[ i ] = clip( pow(i / 255.0, f_gamma) * 255.0);
+    }
+
     /* Fill the luma lookup table */
     for( i = 0 ; i < 256 ; i++ )
     {
-        pi_luma[ i ] = clip( i_lum + i_cont * i / 256 );
+        pi_luma[ i ] = pi_gamma[clip( i_lum + i_cont * i / 256)];
     }
 
     /*