drivers/video/fb_draw.h

   1 #ifndef _FB_DRAW_H
   2 #define _FB_DRAW_H
   3
   4 #include <asm/types.h>
   5
   6     /*
   7      *  Compose two values, using a bitmask as decision value
   8      *  This is equivalent to (a & mask) | (b & ~mask)
   9      */
  10
  11 static inline unsigned long
  12 comp(unsigned long a, unsigned long b, unsigned long mask)
  13 {
  14     return ((a ^ b) & mask) ^ b;
  15 }
  16
  17     /*
  18      *  Create a pattern with the given pixel's color
  19      */
  20
  21 #if BITS_PER_LONG == 64
  22 static inline unsigned long
  23 pixel_to_pat( u32 bpp, u32 pixel)
  24 {
  25         switch (bpp) {
  26         case 1:
  27                 return 0xfffffffffffffffful*pixel;
  28         case 2:
  29                 return 0x5555555555555555ul*pixel;
  30         case 4:
  31                 return 0x1111111111111111ul*pixel;
  32         case 8:
  33                 return 0x0101010101010101ul*pixel;
  34         case 12:
  35                 return 0x0001001001001001ul*pixel;
  36         case 16:
  37                 return 0x0001000100010001ul*pixel;
  38         case 24:
  39                 return 0x0000000001000001ul*pixel;
  40         case 32:
  41                 return 0x0000000100000001ul*pixel;
  42         default:
  43                 panic("pixel_to_pat(): unsupported pixelformat\n");
  44     }
  45 }
  46 #else
  47 static inline unsigned long
  48 pixel_to_pat( u32 bpp, u32 pixel)
  49 {
  50         switch (bpp) {
  51         case 1:
  52                 return 0xfffffffful*pixel;
  53         case 2:
  54                 return 0x55555555ul*pixel;
  55         case 4:
  56                 return 0x11111111ul*pixel;
  57         case 8:
  58                 return 0x01010101ul*pixel;
  59         case 12:
  60                 return 0x00001001ul*pixel;
  61         case 16:
  62                 return 0x00010001ul*pixel;
  63         case 24:
  64                 return 0x00000001ul*pixel;
  65         case 32:
  66                 return 0x00000001ul*pixel;
  67         default:
  68                 panic("pixel_to_pat(): unsupported pixelformat\n");
  69     }
  70 }
  71 #endif
  72 #endif /* FB_DRAW_H */