reactos/boot/freeldr/freeldr/video/fade.c

   1 /*
   2  *  FreeLoader
   3  *  Copyright (C) 1998-2003  Brian Palmer  <brianp@sginet.com>
   4  *
   5  *  This program is free software; you can redistribute it and/or modify
   6  *  it under the terms of the GNU General Public License as published by
   7  *  the Free Software Foundation; either version 2 of the License, or
   8  *  (at your option) any later version.
   9  *
  10  *  This program is distributed in the hope that it will be useful,
  11  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13  *  GNU General Public License for more details.
  14  *
  15  *  You should have received a copy of the GNU General Public License
  16  *  along with this program; if not, write to the Free Software
  17  *  Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  18  */
  19
  20 #include <freeldr.h>
  21
  22 #define RGB_MAX                                         64
  23 #define RGB_MAX_PER_ITERATION           64
  24
  25 VOID VideoSetAllColorsToBlack(ULONG ColorCount)
  26 {
  27         ULONG           Color;
  28
  29         MachVideoSync();
  30
  31         for (Color=0; Color<ColorCount; Color++)
  32         {
  33                 MachVideoSetPaletteColor(Color, 0, 0, 0);
  34         }
  35 }
  36
  37 VOID VideoFadeIn(PPALETTE_ENTRY Palette, ULONG ColorCount)
  38 {
  39         ULONG                           Index;
  40         ULONG                           Color;
  41         PALETTE_ENTRY   PaletteColors[ColorCount];
  42
  43         for (Index=0; Index<RGB_MAX; Index++)
  44         {
  45
  46                 for (Color=0; Color<ColorCount; Color++)
  47                 {
  48                         MachVideoGetPaletteColor(Color, &PaletteColors[Color].Red, &PaletteColors[Color].Green, &PaletteColors[Color].Blue);
  49
  50                         // Increment each color so it approaches its real value
  51                         if (PaletteColors[Color].Red < Palette[Color].Red)
  52                         {
  53                                 PaletteColors[Color].Red++;
  54                         }
  55                         if (PaletteColors[Color].Green < Palette[Color].Green)
  56                         {
  57                                 PaletteColors[Color].Green++;
  58                         }
  59                         if (PaletteColors[Color].Blue < Palette[Color].Blue)
  60                         {
  61                                 PaletteColors[Color].Blue++;
  62                         }
  63
  64                         // Make sure we haven't exceeded the real value
  65                         if (PaletteColors[Color].Red > Palette[Color].Red)
  66                         {
  67                                 PaletteColors[Color].Red = Palette[Color].Red;
  68                         }
  69                         if (PaletteColors[Color].Green > Palette[Color].Green)
  70                         {
  71                                 PaletteColors[Color].Green = Palette[Color].Green;
  72                         }
  73                         if (PaletteColors[Color].Blue > Palette[Color].Blue)
  74                         {
  75                                 PaletteColors[Color].Blue = Palette[Color].Blue;
  76                         }
  77                 }
  78
  79                 // Set the colors
  80                 for (Color=0; Color<ColorCount; Color++)
  81                 {
  82                         if ((Color % RGB_MAX_PER_ITERATION) == 0)
  83                         {
  84                                 MachVideoSync();
  85                         }
  86
  87                         MachVideoSetPaletteColor(Color, PaletteColors[Color].Red, PaletteColors[Color].Green, PaletteColors[Color].Blue);
  88                 }
  89         }
  90 }
  91
  92 VOID VideoFadeOut(ULONG ColorCount)
  93 {
  94         ULONG           Index;
  95         ULONG           Color;
  96         UCHAR           Red;
  97         UCHAR           Green;
  98         UCHAR           Blue;
  99
 100         for (Index=0; Index<RGB_MAX; Index++)
 101         {
 102                 for (Color=0; Color<ColorCount; Color++)
 103                 {
 104                         if ((Color % RGB_MAX_PER_ITERATION) == 0)
 105                         {
 106                                 MachVideoSync();
 107                         }
 108
 109                         MachVideoGetPaletteColor(Color, &Red, &Green, &Blue);
 110
 111                         if (Red > 0)
 112                         {
 113                                 Red--;
 114                         }
 115                         if (Green > 0)
 116                         {
 117                                 Green--;
 118                         }
 119                         if (Blue > 0)
 120                         {
 121                                 Blue--;
 122                         }
 123
 124                         MachVideoSetPaletteColor(Color, Red, Green, Blue);
 125                 }
 126         }
 127 }