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         PPALETTE_ENTRY  PaletteColors;
  42
  43         PaletteColors = MmHeapAlloc(sizeof(PALETTE_ENTRY) * ColorCount);
  44         if (!PaletteColors) return;
  45
  46         for (Index=0; Index<RGB_MAX; Index++)
  47         {
  48
  49                 for (Color=0; Color<ColorCount; Color++)
  50                 {
  51                         MachVideoGetPaletteColor(Color, &PaletteColors[Color].Red, &PaletteColors[Color].Green, &PaletteColors[Color].Blue);
  52
  53                         // Increment each color so it approaches its real value
  54                         if (PaletteColors[Color].Red < Palette[Color].Red)
  55                         {
  56                                 PaletteColors[Color].Red++;
  57                         }
  58                         if (PaletteColors[Color].Green < Palette[Color].Green)
  59                         {
  60                                 PaletteColors[Color].Green++;
  61                         }
  62                         if (PaletteColors[Color].Blue < Palette[Color].Blue)
  63                         {
  64                                 PaletteColors[Color].Blue++;
  65                         }
  66
  67                         // Make sure we haven't exceeded the real value
  68                         if (PaletteColors[Color].Red > Palette[Color].Red)
  69                         {
  70                                 PaletteColors[Color].Red = Palette[Color].Red;
  71                         }
  72                         if (PaletteColors[Color].Green > Palette[Color].Green)
  73                         {
  74                                 PaletteColors[Color].Green = Palette[Color].Green;
  75                         }
  76                         if (PaletteColors[Color].Blue > Palette[Color].Blue)
  77                         {
  78                                 PaletteColors[Color].Blue = Palette[Color].Blue;
  79                         }
  80                 }
  81
  82                 // Set the colors
  83                 for (Color=0; Color<ColorCount; Color++)
  84                 {
  85                         if ((Color % RGB_MAX_PER_ITERATION) == 0)
  86                         {
  87                                 MachVideoSync();
  88                         }
  89
  90                         MachVideoSetPaletteColor(Color, PaletteColors[Color].Red, PaletteColors[Color].Green, PaletteColors[Color].Blue);
  91                 }
  92         }
  93 }
  94
  95 VOID VideoFadeOut(ULONG ColorCount)
  96 {
  97         ULONG           Index;
  98         ULONG           Color;
  99         UCHAR           Red;
 100         UCHAR           Green;
 101         UCHAR           Blue;
 102
 103         for (Index=0; Index<RGB_MAX; Index++)
 104         {
 105                 for (Color=0; Color<ColorCount; Color++)
 106                 {
 107                         if ((Color % RGB_MAX_PER_ITERATION) == 0)
 108                         {
 109                                 MachVideoSync();
 110                         }
 111
 112                         MachVideoGetPaletteColor(Color, &Red, &Green, &Blue);
 113
 114                         if (Red > 0)
 115                         {
 116                                 Red--;
 117                         }
 118                         if (Green > 0)
 119                         {
 120                                 Green--;
 121                         }
 122                         if (Blue > 0)
 123                         {
 124                                 Blue--;
 125                         }
 126
 127                         MachVideoSetPaletteColor(Color, Red, Green, Blue);
 128                 }
 129         }
 130 }