LXR linux/drivers/video/fb

   1#ifndef _FB_DRAW_H
   2#define _FB_DRAW_H
   3
   4#include <asm/types.h>
   5#include <linux/fb.h>
   6
   7    /*
   8     *  Compose two values, using a bitmask as decision value
   9     *  This is equivalent to (a & mask) | (b & ~mask)
  10     */
  11
  12static inline unsigned long
  13comp(unsigned long a, unsigned long b, unsigned long mask)
  14{
  15    return ((a ^ b) & mask) ^ b;
  16}
  17
  18    /*
  19     *  Create a pattern with the given pixel's color
  20     */
  21
  22#if BITS_PER_LONG == 64
  23static inline unsigned long
  24pixel_to_pat( u32 bpp, u32 pixel)
  25{
  26        switch (bpp) {
  27        case 1:
  28                return 0xfffffffffffffffful*pixel;
  29        case 2:
  30                return 0x5555555555555555ul*pixel;
  31        case 4:
  32                return 0x1111111111111111ul*pixel;
  33        case 8:
  34                return 0x0101010101010101ul*pixel;
  35        case 12:
  36                return 0x1001001001001001ul*pixel;
  37        case 16:
  38                return 0x0001000100010001ul*pixel;
  39        case 24:
  40                return 0x0001000001000001ul*pixel;
  41        case 32:
  42                return 0x0000000100000001ul*pixel;
  43        default:
  44                panic("pixel_to_pat(): unsupported pixelformat\n");
  45    }
  46}
  47#else
  48static inline unsigned long
  49pixel_to_pat( u32 bpp, u32 pixel)
  50{
  51        switch (bpp) {
  52        case 1:
  53                return 0xfffffffful*pixel;
  54        case 2:
  55                return 0x55555555ul*pixel;
  56        case 4:
  57                return 0x11111111ul*pixel;
  58        case 8:
  59                return 0x01010101ul*pixel;
  60        case 12:
  61                return 0x01001001ul*pixel;
  62        case 16:
  63                return 0x00010001ul*pixel;
  64        case 24:
  65                return 0x01000001ul*pixel;
  66        case 32:
  67                return 0x00000001ul*pixel;
  68        default:
  69                panic("pixel_to_pat(): unsupported pixelformat\n");
  70    }
  71}
  72#endif
  73
  74#ifdef CONFIG_FB_CFB_REV_PIXELS_IN_BYTE
  75#if BITS_PER_LONG == 64
  76#define REV_PIXELS_MASK1 0x5555555555555555ul
  77#define REV_PIXELS_MASK2 0x3333333333333333ul
  78#define REV_PIXELS_MASK4 0x0f0f0f0f0f0f0f0ful
  79#else
  80#define REV_PIXELS_MASK1 0x55555555ul
  81#define REV_PIXELS_MASK2 0x33333333ul
  82#define REV_PIXELS_MASK4 0x0f0f0f0ful
  83#endif
  84
  85static inline unsigned long fb_rev_pixels_in_long(unsigned long val,
  86                                                  u32 bswapmask)
  87{
  88        if (bswapmask & 1)
  89                val = comp(val >> 1, val << 1, REV_PIXELS_MASK1);
  90        if (bswapmask & 2)
  91                val = comp(val >> 2, val << 2, REV_PIXELS_MASK2);
  92        if (bswapmask & 3)
  93                val = comp(val >> 4, val << 4, REV_PIXELS_MASK4);
  94        return val;
  95}
  96
  97static inline u32 fb_shifted_pixels_mask_u32(struct fb_info *p, u32 index,
  98                                             u32 bswapmask)
  99{
 100        u32 mask;
 101
 102        if (!bswapmask) {
 103                mask = FB_SHIFT_HIGH(p, ~(u32)0, index);
 104        } else {
 105                mask = 0xff << FB_LEFT_POS(p, 8);
 106                mask = FB_SHIFT_LOW(p, mask, index & (bswapmask)) & mask;
 107                mask = FB_SHIFT_HIGH(p, mask, index & ~(bswapmask));
 108#if defined(__i386__) || defined(__x86_64__)
 109                /* Shift argument is limited to 0 - 31 on x86 based CPU's */
 110                if(index + bswapmask < 32)
 111#endif
 112                        mask |= FB_SHIFT_HIGH(p, ~(u32)0,
 113                                        (index + bswapmask) & ~(bswapmask));
 114        }
 115        return mask;
 116}
 117
 118static inline unsigned long fb_shifted_pixels_mask_long(struct fb_info *p,
 119                                                        u32 index,
 120                                                        u32 bswapmask)
 121{
 122        unsigned long mask;
 123
 124        if (!bswapmask) {
 125                mask = FB_SHIFT_HIGH(p, ~0UL, index);
 126        } else {
 127                mask = 0xff << FB_LEFT_POS(p, 8);
 128                mask = FB_SHIFT_LOW(p, mask, index & (bswapmask)) & mask;
 129                mask = FB_SHIFT_HIGH(p, mask, index & ~(bswapmask));
 130#if defined(__i386__) || defined(__x86_64__)
 131                /* Shift argument is limited to 0 - 31 on x86 based CPU's */
 132                if(index + bswapmask < BITS_PER_LONG)
 133#endif
 134                        mask |= FB_SHIFT_HIGH(p, ~0UL,
 135                                        (index + bswapmask) & ~(bswapmask));
 136        }
 137        return mask;
 138}
 139
 140
 141static inline u32 fb_compute_bswapmask(struct fb_info *info)
 142{
 143        u32 bswapmask = 0;
 144        unsigned bpp = info->var.bits_per_pixel;
 145
 146        if ((bpp < 8) && (info->var.nonstd & FB_NONSTD_REV_PIX_IN_B)) {
 147                /*
 148                 * Reversed order of pixel layout in bytes
 149                 * works only for 1, 2 and 4 bpp
 150                 */
 151                bswapmask = 7 - bpp + 1;
 152        }
 153        return bswapmask;
 154}
 155
 156#else /* CONFIG_FB_CFB_REV_PIXELS_IN_BYTE */
 157
 158static inline unsigned long fb_rev_pixels_in_long(unsigned long val,
 159                                                  u32 bswapmask)
 160{
 161        return val;
 162}
 163
 164#define fb_shifted_pixels_mask_u32(p, i, b) FB_SHIFT_HIGH((p), ~(u32)0, (i))
 165#define fb_shifted_pixels_mask_long(p, i, b) FB_SHIFT_HIGH((p), ~0UL, (i))
 166#define fb_compute_bswapmask(...) 0
 167
 168#endif  /* CONFIG_FB_CFB_REV_PIXELS_IN_BYTE */
 169
 170#define cpu_to_le_long _cpu_to_le_long(BITS_PER_LONG)
 171#define _cpu_to_le_long(x) __cpu_to_le_long(x)
 172#define __cpu_to_le_long(x) cpu_to_le##x
 173
 174#define le_long_to_cpu _le_long_to_cpu(BITS_PER_LONG)
 175#define _le_long_to_cpu(x) __le_long_to_cpu(x)
 176#define __le_long_to_cpu(x) le##x##_to_cpu
 177
 178static inline unsigned long rolx(unsigned long word, unsigned int shift, unsigned int x)
 179{
 180        return (word << shift) | (word >> (x - shift));
 181}
 182
 183#endif /* FB_DRAW_H */
 184